WO2021147914A1

WO2021147914A1 - Low-voltage protection method and system for vehicle-mounted devices

Info

Publication number: WO2021147914A1
Application number: PCT/CN2021/072906
Authority: WO
Inventors: 田晓明; 赵烁
Original assignee: 北京嘀嘀无限科技发展有限公司
Priority date: 2020-01-20
Filing date: 2021-01-20
Publication date: 2021-07-29

Abstract

A low-voltage protection method and system for vehicle-mounted devices. The low-voltage protection method comprises: acquiring a target protection voltage of a vehicle storage battery at the current time, the vehicle storage battery supplying power to one or more vehicle-mounted devices (130) after the vehicle is powered off, and the value of the target protection voltage being dynamically updated over time; comparing the target protection voltage with the real-time voltage of the vehicle storage battery; and determining an operation instruction related to the one or more vehicle-mounted devices (130) according to the comparison result.

Description

Low-voltage protection method and system for vehicle-mounted equipment

cross reference

This application requires a Chinese patent application filed on January 20, 2020 with an application number of 202020132911.0, a Chinese patent application filed on January 20, 2020 with an application number of 202020129090.5, and a Chinese patent application filed on January 20, 2020 with an application number of 202010063951.9 Priority of Chinese patent applications. The content of the above application is included here by reference.

Technical field

This application relates to the technical field of vehicle equipment, and in particular to a low-voltage protection method and system for vehicle equipment, a protection device and method for vehicle equipment, and a monitoring method and system for vehicle equipment.

Background technique

The vehicle battery is the main power supply component of the car. It not only provides starting current for the engine, but also powers the entire car's electronic equipment. Currently, there are more and more types of vehicle-mounted electronic equipment, such as vehicle-mounted GPS terminals, vehicle-mounted electronic dogs, reversing radars, driving recorders, vehicle-mounted navigation systems, and so on. These in-vehicle electronic devices generally do not set up an independent power supply, but directly use the vehicle battery as the power supply source, which leads to the continuous increase of the power supply pressure of the vehicle battery. Therefore, higher requirements are put forward for the design of the power supply system of various in-vehicle electronic devices. Take the car GPS terminal as an example. The functions of the car GPS terminal on the market are becoming more and more powerful, especially after integrating access control, monitoring and other functions, it is objectively required that the car GPS terminal must be in working condition for 24 hours, and there are some functions of the car terminal. , Such as collision detection, flameout recording and other functions, all require the vehicle to be in working condition after it is turned off. If the vehicle is parked for a period of time, the vehicle battery will often cause the vehicle to fail to start properly due to continuous power consumption, or even run out of battery And permanent damage.

Summary of the invention

The purpose of the embodiments of this application is to provide a low-voltage protection method and system for vehicle-mounted equipment, which dynamically adjusts the low-voltage protection value of the vehicle battery to solve the problem of battery loss or premature shutdown of some functions of the vehicle-mounted equipment under different conditions. . Other embodiments of the present application also provide a low-voltage protection device for vehicle equipment, which implements low-voltage protection of the vehicle battery without increasing the hardware cost, so as to solve the problem of the risk of exhausting the vehicle battery when the software program is abnormal. . Other embodiments of the present application also provide a monitoring method and system for vehicle-mounted equipment to monitor the abnormal working state of the vehicle-mounted equipment in real time.

The embodiments of this application adopt the following technical solutions:

One aspect of the present application provides a low-voltage protection method for vehicle-mounted equipment. The method includes: obtaining a target protection voltage of a vehicle battery at the current time, the vehicle battery provides power to one or more on-board equipment after the vehicle is turned off, and the value of the target protection voltage is dynamically updated as time changes; The target protection voltage and the real-time voltage of the vehicle battery; and the operation instruction related to the one or more on-board equipment is determined according to the comparison result.

One aspect of the present application provides a protection device for vehicle-mounted equipment, including a voltage input circuit, a voltage conversion circuit, a power supply circuit, and a trigger circuit, wherein: the voltage input circuit is connected to a vehicle battery; The in-vehicle electronic equipment is connected; the voltage conversion circuit is arranged between the voltage input circuit and the power supply circuit; the trigger circuit is arranged in parallel at both ends of the voltage conversion circuit, and when a trigger condition is met, the trigger The circuit generates a corresponding control signal, wherein the trigger circuit includes a voltage comparison circuit for comparing the input voltage of the voltage input circuit with a preset threshold.

Another aspect of the present application also provides a monitoring system for vehicle-mounted equipment. The system includes: a storage device storing a set of instructions; and one or more processors in communication with the storage device, wherein, when the set of instructions is executed, the one or more processors are configured to cause the System: Obtain the associated parameters of the vehicle-mounted equipment; the associated parameters can reflect the working status of the vehicle-mounted equipment; determine the operation instruction information related to the vehicle-mounted equipment based on the associated parameters and the corresponding preset threshold.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments described in this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

Fig. 1 is an application scenario diagram of a protection system for a vehicle-mounted device according to some embodiments of the present application;

Fig. 2 is an exemplary flowchart of a method for protecting a vehicle-mounted device according to some embodiments of the present application;

Fig. 3 is an exemplary flowchart of a low-voltage protection method for vehicle-mounted equipment according to some embodiments of the present application;

Fig. 4 is a block diagram of a low-voltage protection system for vehicle equipment according to some embodiments of the present application;

Fig. 5 is a schematic structural diagram of a protection device for vehicle-mounted equipment according to some embodiments of the present application;

Fig. 6 is a schematic circuit diagram of a protection device for vehicle-mounted equipment according to some embodiments of the present application;

Fig. 7 is an exemplary flow chart of a monitoring method for a vehicle-mounted device according to some embodiments of the present application;

Fig. 8 is a block diagram of a monitoring system of a vehicle-mounted device according to some embodiments of the present application;

FIG. 9 is a schematic structural diagram of a monitoring device of a vehicle-mounted device according to some embodiments of the present application;

FIG. 10 is a schematic diagram of the connection between a vehicle battery and an on-board equipment power supply according to some embodiments of the present application;

Fig. 11 is another schematic structural diagram of a monitoring device for vehicle-mounted equipment according to some embodiments of the present application; and

Fig. 12 is a schematic circuit diagram of a monitoring device of a vehicle-mounted device according to some embodiments of the present application.

Detailed ways

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some examples or embodiments of the application. For those of ordinary skill in the art, without creative work, the application can be applied to the application according to these drawings. Other similar scenarios. Unless it is obvious from the language environment or otherwise stated, the same reference numerals in the figures represent the same structure or operation.

It should be understood that the “system”, “device”, “unit” and/or “module” used herein is a method for distinguishing different components, elements, parts, parts, or assemblies of different levels. However, if other words can achieve the same purpose, the words can be replaced by other expressions.

As shown in the present application and claims, unless the context clearly suggests exceptional circumstances, the words "a", "an", "an" and/or "the" do not specifically refer to the singular, but may also include the plural. Generally speaking, the terms "include" and "include" only suggest that the clearly identified steps and elements are included, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

In this application, a flowchart is used to illustrate the operations performed by the system according to the embodiment of the application. It should be understood that the preceding or following operations are not necessarily performed exactly in order. Instead, the steps can be processed in reverse order or at the same time. At the same time, other operations can be added to these processes, or a certain step or several operations can be removed from these processes.

The Microcontroller Unit (MCU) mentioned in some embodiments of the present application, also known as Single Chip Microcomputer or Single Chip Microcomputer, is the frequency of the central processing unit (Central Process Unit, CPU). Reduce the specifications appropriately, integrate peripheral interfaces such as memory, counters, USB, analog-to-digital conversion, UART, PLC, DMA, and even LCD drive circuits on a single chip to form a chip-level computer, which is different for different applications. Combination control.

The Analog to Digital Converter (ADC for short) mentioned in some embodiments of the present application is used to convert an analog signal into a digital signal. In this application, the analog-to-digital converter specifically refers to converting a voltage into a digital signal, and obtaining the input voltage value by calculating the digital signal.

The DCDC mentioned in some embodiments of the present application refers to the conversion of a high-voltage (low-voltage) direct current power supply into a low-voltage (high-voltage) direct current power supply. For example, the DCDC converter connected to the on-board DC power supply converts high-voltage direct current into low-voltage direct current.

Some embodiments of the present application provide a low-voltage protection method and system for vehicle-mounted equipment, a protection device and system for vehicle-mounted equipment, and a monitoring method and system for vehicle-mounted equipment, which can be applied to different types of vehicles, including land , Marine, aerospace, etc., where the vehicles are mainly land vehicles, including taxis, private cars, ride-hailing vehicles, buses, trucks, trucks, load-bearing vehicles, etc. The vehicle-mounted equipment may be different types of electronic equipment with additional functions applied to the vehicle, and may include a driving recorder, a vehicle-mounted audio, a vehicle-mounted display device, a vehicle-mounted GPS, a vehicle-mounted electronic dog, a reversing radar, a vehicle-mounted WIFI, and a vehicle-mounted navigation system , Car alarm system and other electronic equipment. In some embodiments, the method, device, and system are mainly applied to in-vehicle equipment mounted on a vehicle, such as a driving recorder. It should be understood that the application scenarios of the system and method of the present application are only some examples or embodiments of the present application. For those of ordinary skill in the art, they can also be based on these drawings without creative work. Apply this application to other similar scenarios.

The terms "low-voltage protection value", "low-voltage protection threshold", "low-voltage protection voltage", and "target protection voltage" in this application can be used interchangeably to indicate that when the detected voltage is lower than a certain value, perform related operations to The voltage threshold for low voltage protection.

In some embodiments, by setting the low-voltage protection value, when it is detected that the battery voltage is lower than the low-voltage protection value, all flameout retention functions can be stopped, so that the on-board electronic equipment can be completely powered off, and the continuous consumption caused by the on-board electronic equipment can be avoided. Electricity. Factors such as different car models, the time of use of the vehicle battery, and different external temperatures affect the state of use of the vehicle battery, which makes the constant low-voltage protection value inapplicable. For example, even if it is the same car of the same brand, the battery status of different cars is inconsistent, and the battery voltage will be different when different batteries are fully charged and when they are depleted. With the passage of time, the vehicle battery will also age. For example, the battery voltage of the same vehicle battery will be different when the battery is full and when the battery is lacking in September 18 and 19 in September. For another example, because the battery is a battery, it is greatly affected by temperature. Even if it is the same battery, the storage capacity in winter will be lower than in summer, and the battery voltage in the same state (such as full charge and loss) is also lower. summer. In some embodiments, by obtaining the target protection voltage of the vehicle battery at the current time, and comparing the target protection voltage with the real-time voltage of the vehicle battery, the operation instructions related to the one or more on-board devices can be determined according to the comparison result. In some embodiments, the value of the target protection voltage is dynamically updated as time changes. The historical voltage data of the vehicle battery within a preset time interval (for example, 7 days before the current time) before the current time can be obtained, so as to be based on the history. The voltage data determines the target protection voltage. In some embodiments, the battery voltage value of the vehicle after the vehicle is turned off within a preset time interval may be collected at a preset sampling frequency (for example, 1 time/minute), and a weighted average value of the historical voltage data may be taken, thereby Determine the target protection voltage. In some embodiments, the initial protection voltage may also be obtained to determine the target protection voltage according to the initial protection voltage and historical voltage data. In some embodiments, by dynamically determining the target protection voltage, that is, the low-voltage protection value of the vehicle battery, the low-voltage protection of the vehicle battery can be adaptively performed according to the conditions of the vehicle battery in different states, without affecting the functions of the on-board electronic equipment. Under the circumstances, the service life of the vehicle battery is effectively extended.

In some embodiments, when it is detected that the voltage of the vehicle battery is lower than a certain threshold (for example, the aforementioned low-voltage protection value), all flameout holding functions can be stopped, that is, all functions of the on-board equipment can be shut down to reduce the power consumption to less than 1mA , To avoid the continuous power consumption caused by the on-board equipment, so as to realize the low-voltage protection function. Considering that the ADC module that comes with the MCU increases the hardware cost of the on-board equipment, and when the MCU's built-in software program is abnormal, the low-voltage protection function becomes invalid. In some cases, the above-mentioned functions can be realized through the voltage comparison circuit. In some embodiments, by adding a protection device in front of the on-board equipment, and building a circuit for voltage comparison based on simple electronic devices, the input voltage based on the vehicle battery voltage can be compared with the preset low-voltage protection value to achieve monitoring of the vehicle battery. Voltage, realize the effect of low-voltage protection of the vehicle battery, and extend the service life of the vehicle battery. In some embodiments, the protection device of the vehicle-mounted equipment may include a voltage input circuit, a voltage conversion circuit, and a power supply circuit. The voltage input circuit is connected to the vehicle battery, the power supply circuit is connected to the vehicle electronic equipment, and the voltage conversion circuit is provided in the vehicle. A trigger circuit can be provided in parallel between the voltage input circuit and the power supply circuit, and at the same time at both ends of the voltage conversion circuit. In some embodiments, the trigger circuit may include a voltage comparison circuit for judging the magnitude between the input voltage of the voltage input circuit and a preset threshold, and when the input voltage is less than the preset threshold, The voltage conversion circuit sends a first signal to control the voltage conversion circuit to stop supplying power to the in-vehicle electronic device. In some embodiments, when the input voltage is greater than or equal to the preset threshold, a second signal is sent to the voltage conversion circuit to control the power supply circuit to supply power to the in-vehicle electronic device.

In some embodiments, the vehicle-mounted equipment usually needs to be connected to the vehicle's vehicle-mounted battery for power supply, and its power consumption in the normal working state is mostly within 1A. When the vehicle is turned off, the normal vehicle-mounted equipment will reduce its own power consumption. Control within 20mA. If the on-board equipment is in an abnormal working state, it will continue to consume 1A power consumption after the vehicle is turned off. Taking the vehicle battery capacity of 50Ah as an example, theoretically, the battery can be exhausted in about 50 hours. If the battery is exhausted several times, the vehicle battery will be greatly lost, and the battery will also accelerate the aging speed and shorten the battery life. In some embodiments, by monitoring the associated parameters of the vehicle equipment (such as the operating current of the vehicle equipment, heating temperature, etc.) to determine the working state of the vehicle equipment, the protection can be triggered when the vehicle equipment is monitored to be in an abnormal working state Relevant mechanisms to reduce the loss of the vehicle battery, thereby increasing the service life of the vehicle battery. In some embodiments, a sampling resistor can be set in the vehicle-mounted device, and the working current of the vehicle-mounted device can be determined by measuring the voltage value across the sampling resistor, so as to determine the working state of the vehicle-mounted device. In some embodiments, the working state of the vehicle-mounted device can also be determined by measuring the voltage value across the sampling resistor in the vehicle-mounted device. In some embodiments, a temperature sensor may be provided in the vehicle-mounted device, and the heating temperature of the vehicle-mounted device may be measured by the temperature sensor, so as to determine the working state of the vehicle-mounted device.

Fig. 1 is an application scenario diagram of a protection system for a vehicle-mounted device according to some embodiments of the present application.

The protection system 100 for vehicle equipment can determine the target threshold of the vehicle battery and compare the relevant real-time parameters with the target threshold to determine the operation instructions related to the vehicle equipment. At the same time, the protection system 100 for the vehicle equipment can also monitor the work of the vehicle equipment. Status, and determine the operating information related to the on-board equipment according to the working status. The protection system 100 for in-vehicle equipment may include a server 110, a network 120, an in-vehicle equipment 130, a vehicle user terminal 140, and a storage device 150.

In some embodiments, the target threshold may be the target protection voltage of the vehicle battery, that is, the low voltage protection value, and the relevant real-time parameter is the real-time voltage of the vehicle battery. In some embodiments, in order to be suitable for vehicle batteries in different states, a dynamically updated target protection voltage can be selected, that is, the low-voltage protection value can be dynamically adjusted through historical voltage data. In some embodiments, the relevant real-time voltage can be compared with the target protection voltage through a voltage comparison circuit.

In some embodiments, the working state of the on-board device may include the following three types: normal working state, which is used to characterize the state in which the on-board device is working at the rated power when the vehicle is in normal use; and the low power consumption state, which is used to characterize that the vehicle is turned off. After that, the vehicle-mounted device is working with lower power consumption; the abnormal working state is used to characterize the working state of the vehicle-mounted device with a working current greater than the rated working current. Wherein, the abnormal working state of the vehicle equipment includes two situations: the abnormal working state of the vehicle equipment when the vehicle is not stalled, for example, the working current of the vehicle equipment is greater than the corresponding rated working current when the vehicle is not stalled; and The abnormal working state of the vehicle-mounted device in the flame-out state, for example, the working current of the vehicle-mounted device is greater than the corresponding rated working current in the vehicle flame-out state.

In some embodiments, when the vehicle-mounted device is in a normal working state, it can be understood that the vehicle-mounted device is in normal use of the vehicle battery, that is, the power consumption of the vehicle-mounted device will not cause loss to the vehicle battery. After the vehicle is turned off, when the vehicle-mounted device is in a low power consumption state, it can also be said that the vehicle-mounted device is in a normal working state. That is to say, the normal working state of the on-board device in one or more embodiments of this specification may include the normal working state of the on-board device when the vehicle is running normally, for example, the working current of the on-board device is at a preset rated working current (for example, When the vehicle is not turned off, the corresponding rated operating current); and the normal operating state of the on-board equipment when the vehicle is turned off, the operating current of the on-board equipment is within the preset rated operating current (for example, the corresponding rated operating current when the vehicle is turned off) .

In some embodiments, the rated operating current can be understood as a preset current value. When the vehicle-mounted device is less than or equal to the preset current value, it means that the vehicle-mounted device is in a normal working state, that is, it will not cause loss to the vehicle battery . Among them, the rated operating current of the on-board equipment includes the corresponding rated operating current when the vehicle is running normally, and the corresponding rated operating current when the vehicle is turned off. Wherein, when the vehicle is in normal operation and when the vehicle is turned off, the rated operating current of the corresponding on-board equipment may be different. The specific values of the rated operating current of different on-vehicle devices when the vehicle is running and the specific value of the rated operating current when the vehicle is turned off can be set according to different situations, which are not limited in this manual.

Due to the different parameters of different types of on-board equipment, the rated working current is also different. In some cases, the rated working current of the on-board equipment in the normal working state of the vehicle is 50mA～1A, and the power consumption is low after the vehicle is turned off. The rated working current in the state is usually less than 50mA.

If the on-board equipment is in an abnormal working state for a long time, it will accelerate the aging speed of the vehicle battery. Therefore, by monitoring the working state of the on-board equipment and performing targeted follow-up operations on the on-board equipment in an abnormal working state, the use of the on-board battery can be protected , To avoid shortening the service life of the vehicle battery due to the abnormal operation of the on-board equipment. In addition, according to the different abnormal conditions of the vehicle-mounted equipment, or the state reflected by the associated parameters of the vehicle-mounted equipment, different preset thresholds can be used to perform corresponding different operations on the vehicle-mounted equipment, such as reminding operations and disconnecting operations.

The server 110 may process data and/or information from at least one component of the protection system 100 of the in-vehicle device. For example, the server 110 can collect the historical voltage data of the vehicle battery and the real-time voltage of the vehicle battery through the monitoring device of the on-board equipment 130, and can obtain the previously stored historical voltage data or initial protection voltage of the vehicle battery from the storage device 150, and can also obtain the historical voltage data or the initial protection voltage of the vehicle battery stored in advance from the storage device 150. The historical voltage data and/or the initial protection voltage calculates the target protection voltage of the current vehicle. For another example, the server 110 may compare the target protection voltage with the real-time voltage of the vehicle battery, and determine an operation instruction related to the vehicle-mounted device according to the comparison result, such as whether to stop power supply to the vehicle-mounted device. For another example, the server 110 may send a control signal to the in-vehicle device 130 according to the comparison result. For example, the on-vehicle device 130 may collect and send related parameters reflecting the working state of the on-board device to the server 110. The server 110 processes these related parameters that reflect the working state of the on-board device to obtain the working state of the on-board device, and further based on the working state of the on-board device. Determining the operation instruction information related to the in-vehicle device, for example, determining that the operation instruction information is a reminder operation instruction, a power management operation instruction, or a shutdown operation instruction by comparing an associated parameter with a corresponding preset threshold. For another example, the server 110 may also send the operation instruction information to the in-vehicle device 130 or the vehicle user terminal 140 according to the determined operation instruction information. For another example, when the associated parameter of the vehicle-mounted device includes the operating current of the vehicle-mounted device, the server 110 may obtain the voltage across the resistor connected in series with the vehicle-mounted device from the vehicle-mounted device 130, and determine the corresponding voltage based on the voltage across the resistor. The current reflects the operating current flowing through the in-vehicle device 130.

In some embodiments, the server 110 may be a single processing device or a group of processing devices. The processing device group may be a centralized processing device group connected to the network 120 via an access point, or a distributed processing device group respectively connected to the network 120 via at least one access point. In some embodiments, the server 110 may be locally connected to the network 120 or remotely connected to the network 120. For example, the server 110 may access information and/or data stored in the in-vehicle device 130, the vehicle user terminal 140, and/or the storage device 150 via the network 120. For another example, the storage device 150 may be used as a back-end data storage of the server 110. In some embodiments, the server 110 may be implemented on a cloud platform. For example only, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-layer cloud, etc., or any combination thereof.

In some embodiments, the server 110 may include a processing device 112. The processing device 112 may process information and/or data related to at least one function described in this application. In some embodiments, the processing device 112 may perform the main functions of the protection system 100 of the vehicle-mounted device. In some embodiments, the processing device 112 may also be partially disposed on the vehicle-mounted device 130. In some embodiments, the processing device 112 may process the historical voltage data of the vehicle battery and determine the target protection voltage. In some embodiments, the processing device 112 may process the associated parameters reflecting the working status of the vehicle-mounted device to determine operation instruction information related to the vehicle-mounted device. In some embodiments, the processing device 112 may perform other functions related to the methods and systems described in this application. In some embodiments, the processing device 112 may include at least one processing unit (for example, a single-core processing device or a multi-core processing device).

The network 120 may facilitate the exchange of information and/or data. In some embodiments, at least one component (for example, the server 110, the in-vehicle device 130, the vehicle user terminal 140, and the storage device 150) in the protection system 100 of the in-vehicle equipment can send information and/or data to the in-vehicle device via the network 120. Other components in the equipment protection system 100. For example, the processing device 112 may obtain the pre-stored historical voltage data or initial protection voltage of the vehicle battery and the preset threshold corresponding to the associated parameter from the storage device 150 via the network 120. For another example, the processing device 112 may send the operation instruction information to the vehicle user terminal 140 via the network 120 after determining the operation instruction information.

In some embodiments, the network 120 may be any form of wired or wireless network, or any combination thereof. For example only, the network 120 may include a cable network, a wired network, an optical fiber network, a telecommunication network, an internal network, the Internet, a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN), a metropolitan area network ( MAN), public switched telephone network (PSTN), Bluetooth network, ZigBee network, near field communication (NFC) network, etc. or any combination thereof. In some embodiments, the network 120 may include at least one network access point. For example, the network 120 may include wired or wireless network access points, such as base stations and/or Internet exchange points 120-1, 120-2, ..., and at least one component of the protection system 100 of the vehicle-mounted equipment may be connected to the network 120 to Exchange data and/or information.

The in-vehicle device 130 is an electronic system or device that can be used on a vehicle to increase the functions of the vehicle. The electronic system or device usually uses the vehicle battery on the vehicle to supply power. In some embodiments, the vehicle-mounted equipment may include a camera installed in the vehicle compartment (e.g., a driving recorder), a camera mounted outside the vehicle (e.g., a camera mounted on the vehicle body), a vehicle-mounted audio, a vehicle-mounted display device, Car GPS, car navigation, car WIFI, car charger, car refrigerator, car computer, car alarm system, etc. In some embodiments, a part of the associated parameters of the vehicle-mounted device may reflect the working state of the vehicle-mounted device, and the working state includes a normal working state, a low power consumption state, and an abnormal working state. In some embodiments, the associated parameters of the vehicle-mounted equipment may be acquired through an internal monitoring device. For example, the monitoring device of the vehicle-mounted device 130 may obtain the operating current of the vehicle-mounted device by setting a sampling resistor. For another example, the monitoring device of the vehicle-mounted device 130 may detect the heating temperature of the vehicle-mounted device by setting a temperature sensor. In some embodiments, the in-vehicle device 130 may further include at least part of the processing device 112, configured to perform related operations according to operation instruction information related to the in-vehicle device. For example, when the associated parameter is within a certain threshold, a reminder operation instruction, a power management operation instruction, or a shutdown operation instruction is executed. In some embodiments, when the in-vehicle device 130 is in an offline state, the processing device 112 inside the in-vehicle device may execute related functions of the server 110 and process related data.

The vehicle user may access the server 110 through the vehicle user terminal 140 to connect to the vehicle-mounted device 130, or may directly connect to the vehicle-mounted device 130 through the vehicle user terminal 140 to assist in realizing the related functions of the vehicle-mounted device. For example, a vehicle user may obtain related information, working status, etc. of the vehicle-mounted equipment through the vehicle user terminal 140. The vehicle user terminal 140 may also receive reminder operation information sent by the server 110 or the in-vehicle device 130. For example, the vehicle user may receive various forms of reminder information such as text reminders and voice reminders through the vehicle user terminal 140 to remind the vehicle user that the on-board equipment may be in an abnormal working state.

The storage device 150 may store data and/or instructions. For example, preset thresholds of associated parameters can be stored. In some embodiments, the storage device 150 may store data and/or instructions that can be executed by the processing device 112, and the server 110 may execute or use the data and/or instructions to implement the exemplary methods described in this application. In some embodiments, the storage device 150 may include mass storage, removable storage, volatile read-write storage, read-only storage (ROM), etc., or any combination thereof. In some embodiments, the storage device 150 may be implemented on a cloud platform. For example only, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an internal cloud, a multi-layer cloud, etc., or any combination thereof.

Fig. 2 is an exemplary flowchart of a method for protecting a vehicle-mounted device according to some embodiments of the present application. In some embodiments, one or more steps in the process 200 may be implemented by the server 110 or a processing device provided on the vehicle-mounted device 130.

Step 210: Obtain the target threshold of the vehicle-mounted device at the current time and compare it with relevant real-time parameters. In some embodiments, the vehicle battery is used to supply power to the on-board equipment. Some of the on-board equipment functions (for example, collision detection, flameout recording, etc.) require 24 hours of working status. Therefore, the vehicle battery will still operate after the vehicle is turned off. Provide power to one or more in-vehicle devices. In some embodiments, in order to prevent the aforementioned vehicle-mounted device from draining the battery of the vehicle and stably protect the vehicle battery, the target threshold of the vehicle-mounted device at the current time may be obtained. In some embodiments, the target threshold may be a constant low-voltage protection value, such as 11.1V-11.5V. In some embodiments, the target threshold may also be the target protection voltage of the vehicle battery corresponding to the on-board equipment, and the relevant real-time parameter is the real-time voltage of the vehicle battery, wherein the value of the target protection voltage is dynamically updated as time changes. For details on how to obtain the target protection voltage of the vehicle battery, please refer to the detailed description in Figure 3. In some embodiments, when the target threshold is a low-voltage protection value, a voltage comparison circuit can be set to compare the target threshold with related real-time parameters. For details on how to compare the target threshold with related real-time parameters by setting the voltage comparison circuit, please refer to the detailed description in the part of FIG. 5. In some embodiments, the target threshold may also be a preset threshold of an associated parameter that can reflect the working state of the on-board device, that is, the relevant real-time parameter is an associated parameter, which may include the operating current and/or of the on-board device Or the heating temperature of the on-board equipment. For details on how to protect the vehicle battery according to the associated parameters and preset thresholds, please refer to the detailed description in the part of FIG.

Step 220: Determine an operation instruction related to the vehicle-mounted device according to the comparison result. In some embodiments, when the target threshold is the low-voltage protection value and the relevant real-time parameter is greater than or equal to the target threshold, it can be determined that the vehicle battery continues to supply power to one or more on-board equipment or the on-board equipment Continue to perform related necessary functions. In some embodiments, when the target threshold is the low-voltage protection value and the relevant real-time parameter is less than the target threshold, it can be determined that the vehicle battery stops supplying power to the on-board device, or controls the on-board device to be completely shut off. Power up and turn off all functions. In some embodiments, when the relevant real-time parameter is an associated parameter of the vehicle-mounted device, such as the operating current or heating temperature of the vehicle-mounted device, and the target threshold is a corresponding preset threshold, the operation instructions related to the vehicle-mounted device may be Including reminding operation instructions, power management operation instructions, namely shutdown operation instructions. For details on how to determine the operation instructions related to the vehicle-mounted device according to the comparison result, please refer to the detailed descriptions in FIGS. 3, 5, 7 and other parts.

It should be noted that the foregoing description of the process 200 is only for example and description, and does not limit the scope of application of the present application. For those skilled in the art, various modifications and changes can be made to the process 200 under the guidance of this application. However, these amendments and changes are still within the scope of this application.

Fig. 3 is an exemplary flowchart of a low-voltage protection method for vehicle-mounted equipment according to some embodiments of the present application. In some embodiments, one or more steps in the process 300 may be implemented by the server 110 or a processing device provided on the vehicle-mounted device 130.

Step 310: Obtain the target protection voltage of the vehicle battery at the current time. In some embodiments, the functions of some in-vehicle devices (for example, collision detection, flameout recording, etc.) require 24 hours of operation, so the vehicle battery will still provide power to one or more in-vehicle devices after the vehicle is turned off. In some embodiments, the vehicle-mounted equipment may be different types of electronic equipment with additional functions applied to the vehicle, and may include a driving recorder, a vehicle-mounted audio, a vehicle-mounted display device, a vehicle-mounted GPS, a vehicle-mounted electronic dog, a reversing radar, Car WIFI, car navigation system, car alarm system and other electronic equipment. The target protection voltage is the voltage threshold for low-voltage protection of the vehicle battery at the current time, and may be a low-voltage protection voltage that is changed according to the relevant conditions of the vehicle. In some embodiments, in order to prevent the above-mentioned on-board equipment from depleting the power of the vehicle battery and stably perform low-voltage protection on the vehicle battery, the target protection voltage of the vehicle battery at the current time may be obtained, wherein the value of the target protection voltage changes with time And dynamic update. In some embodiments, the current time may be the time of a designated date, or may be the time of the current actual date.

In some embodiments, the historical voltage data of the vehicle battery within a preset time interval before the current time may be obtained, and the target protection voltage may be determined according to the historical voltage data. Obtain the battery voltage sampling data every time the vehicle is turned off, so that the low-voltage protection value for the on-board electronic equipment can be dynamically determined according to the changes in the battery voltage sampling data.

In some embodiments, the preset time interval may be determined according to actual sampling needs, for example, the preset time interval may be determined according to the required low-voltage protection value on a specified date. In some embodiments, the preset time interval can be set to 3 days, 5 days, 7 days, 10 days, or the like. In some embodiments, the current time is the Mth day, and the preset time interval is N days, and the historical voltage data is the battery life of the vehicle after the vehicle is turned off during the period from (MN) to (M-1) day. Voltage data, where M is greater than N, and N is greater than or equal to 1. For example, if the current time is the 8th day and the preset time interval is 7 days, the historical voltage data is the voltage data of the vehicle battery after the vehicle is turned off during the time period from 00:00 on the first day to 24:00 on the seventh day. In some embodiments, it is also possible to collect voltage data within a predetermined period of time after the vehicle is turned off, for example, the voltage data of the vehicle battery 10 minutes after the vehicle is turned off. In some embodiments, the preset time interval can be adjusted according to needs or related influencing factors. For example, if the vehicle is used less, that is, the vehicle stalling time is relatively long, you can set a relatively small preset time interval, such as about 5 days, if the vehicle is used more, that is, the vehicle stalling time is relatively less, you can set A relatively large preset time interval, such as about 10 days.

In some embodiments, the voltage value of the vehicle battery after the vehicle is turned off within the preset time interval may be collected at a preset sampling frequency. The preset sampling frequency is the pre-set frequency of collecting voltage data of the vehicle battery during the vehicle shutdown time period. In some embodiments, the preset sampling frequency may be determined according to factors such as actual sampling requirements, accuracy requirements of sampling data, and performance of the data acquisition device. If the preset sampling frequency for sampling is too low (that is, the sampling interval is too long), the accuracy of subsequent data calculations will be lower, and if the preset sampling frequency for sampling is too high (that is, the sampling interval is too small), it will As a result, the amount of collected data is too large, and the workload of subsequent data calculation is too large. In some embodiments, the battery voltage data can be sampled once every minute, that is, the battery voltage sampling data after the vehicle is turned off every 1 minute, so that the calculation accuracy and the calculation efficiency of the sampled data can be taken into account. In some embodiments, the preset sampling frequency may be 1 minute/time, 2 minutes/time, 5 minutes/time, etc. In some embodiments, the preset sampling frequency can be adjusted at any time according to actual conditions or related influencing factors.

In some examples, a weighted average of the historical voltage data may be taken to determine the target protection voltage. In some embodiments, all the historical voltage data collected (sampling data from day (MN) to day (M-1)) or selected valid part of the historical voltage data may be preset to Algorithm to calculate the target protection voltage at the current time (that is, the Mth day). In some embodiments, the preset algorithm may be a weighted average algorithm, or other algorithms that can achieve similar effects. For example, if the current time is the 8th day and the preset time interval is 7 days, all voltage data or battery voltage data of the vehicle after the vehicle is turned off during the time period from 0:00 on the 1st day to 24:00 on the 7th day can be obtained. Part of the voltage data is a weighted average value, as the low-voltage protection value of the M-th day, that is, the target protection voltage at the current time.

In some embodiments, in order to facilitate calculations, all collected historical voltage data can be selected for weighted average processing. Of course, the historical voltage data of all vehicle batteries can also be preliminarily screened, for example, can be filtered. Except the data that may have fluctuations or errors in the historical voltage data. In some embodiments, taking the weighted average of the historical voltage data may include sorting the collected historical voltage data to form a data sequence, filtering out part of the historical voltage data at both ends of the data sequence, and then filtering according to the The latter data sequence takes a weighted average value to determine the target protection voltage. In some embodiments, considering that the head and tail data in the historical voltage data of the vehicle battery may have certain fluctuations or errors, the battery voltage sampling data at the head and tail can be eliminated to ensure the accuracy of subsequent data calculations. sex. In some embodiments, all historical voltage data can be sorted according to the magnitude of the voltage value, and the 5% data at the head and 5% data at the tail of the data sequence can be filtered out. The filtering operation here is to filter out the high-voltage and low-voltage burr data caused by the fluctuation of the vehicle battery, and retain the middle 90% of the sampled data for weighted average processing to improve the accuracy and precision of the low-voltage protection value obtained .

In some embodiments, if the current time is the M+1th day and the preset time interval is unchanged at N days, in order to obtain the target protection voltage on the M+1th day, the historical voltage data that needs to be collected is the (M-th) N+1) The voltage data of the vehicle battery after the vehicle is turned off in the time period from day to the Mth day, that is, the start and end time of the sampling period is pushed back by one day during each sampling process. In some embodiments, by updating M=M+1, and the preset time interval N remains unchanged, the foregoing acquisition of historical voltage data can be repeated, that is, the vehicle battery voltage data from day (MN) to day (M-1). , So as to determine the low-voltage protection value of the M-th day according to the historical voltage data, until the M-th day is the designated date, that is, the target protection voltage of the designated date can be obtained. Just as an example, if the preset time interval is set to 7 days, that is, M-N=M-7, the battery voltage sampling data after the vehicle is turned off for 7 consecutive days can be collected. When M=8 and MN=1, in this case, the battery voltage data from the first day to the seventh day after the vehicle is turned off for the first time can be collected, and the data collected from 0:00 to 0:00 on the first day can be collected. The weighted average of all or part of the battery voltage sampling data after the vehicle is turned off at 24:00 on the 7th day is taken as the low-voltage protection value on the 8th day. By setting M=M+1=9, MN=M+1-N=2, M-1=M+1-1=8, repeat the above steps of collecting and determining the weighted average, that is, continue collecting the first The voltage data of the vehicle battery during the period from 0:00 to 24:00 on the 8th day of 2 days can obtain the low voltage protection value of the 9th day, and so on, until M is the specified date, it can be passed before the specified date The voltage data of the vehicle battery for 7 days can obtain the low-voltage protection value on the specified date.

In some embodiments, the target protection voltage can also be determined by obtaining the initial protection voltage and historical voltage data. In some embodiments, generally for on-vehicle devices with different functions installed on vehicles, a universal initial low-voltage protection value can be set as the initial value. The low-voltage protection value here is as suitable as possible for different vehicles and different vehicles. This type of vehicle-mounted electronic equipment is especially suitable for vehicle-mounted electronic equipment mounted on the vehicle. In some embodiments, the initial protection voltage can be set to a higher low-voltage protection value, for example, between 11.3V and 11.8V, for example, 11.5V. In some embodiments, the initial protection voltage can be adjusted according to requirements and actual usage conditions. In some embodiments, the initial protection voltage and the obtained historical voltage data may be processed to obtain the target protection voltage. For example, when the collected historical voltage data within the preset interval time is insufficient, the target protection voltage can be determined with reference to the initial protection voltage. Just as an example, a certain weight can be set for the initial protection voltage, and a weighted average calculation can be performed together with the collected historical voltage data of the vehicle battery to determine the target protection voltage. In some embodiments, the historical voltage data may also be obtained by collecting battery voltage data after the vehicle is turned off on non-consecutive days within a preset time interval. For example, it is possible to collect only battery voltage data after the vehicle is turned off in odd or even days from the current time as the historical voltage data.

In some embodiments, the target protection voltage is calculated by a preset algorithm based on the historical voltage data of the vehicle battery. Through the historical voltage data, the most suitable low-voltage protection value can be obtained by considering the state of the vehicle battery, that is, according to the vehicle battery location. Under different conditions, the low-voltage protection of the vehicle battery is adaptively performed. For example, under other conditions of the same vehicle battery, the target protection voltage determined in winter will be slightly lower than the low-voltage protection voltage determined in summer. For another example, the target protection voltage determined in September of 19th will be slightly lower than the low-voltage protection voltage determined in September of 18th for the same vehicle battery under the same other conditions. Therefore, it is very necessary to dynamically adjust the low-voltage protection voltage of the vehicle battery, which can effectively prevent the continuous power consumption of the on-board sub-equipment caused by the low low-voltage protection value and the premature shutdown of some functions of the on-board electronic equipment caused by the high low-voltage protection value. Protect the vehicle's on-board electronic equipment to the greatest extent and extend the service life of the vehicle battery.

Step 320: Compare the target protection voltage with the real-time voltage of the vehicle battery. In some embodiments, the real-time voltage of the vehicle battery can be detected in real time, and the real-time voltage can be compared with the acquired target protection voltage. In some embodiments, the real-time voltage of the vehicle battery can be continuously monitored by the ADC (converting an analog signal to a digital signal, in this article, specifically referring to converting a voltage to a digital signal, and calculating the input voltage value by calculating the digital signal) module, And compare the real-time voltage with the low-voltage protection value, that is, the target protection voltage obtained in step 310. In some embodiments, since the value of the target protection voltage can be dynamically updated as time changes, the dynamically updated target protection voltage needs to be compared with the real-time voltage of the vehicle battery at different times. In some embodiments, it is also possible to compare the target protection voltage with the real-time voltage of the vehicle battery through the protection device of the vehicle-mounted equipment shown in FIG. 5. Since the target protection voltage is a dynamically updated voltage value, the vehicle-mounted equipment's The protection device needs a preset threshold that can be dynamically adjusted and compared.

Step 330: Determine an operation instruction related to the one or more vehicle-mounted devices according to the comparison result. In some embodiments, the operation instruction related to the vehicle-mounted device may include whether the vehicle battery continues to supply power to the vehicle-mounted device or whether to control the vehicle-mounted device to completely power off and close all functions. In some embodiments, if the real-time voltage of the vehicle battery is greater than or equal to the target protection voltage, the vehicle battery can continue to supply power to the one or more on-board devices or the on-board device can continue to perform related Necessary functions. In some embodiments, if the real-time voltage of the vehicle battery is less than the target protection voltage, the vehicle battery can stop supplying power to the one or more on-board devices, or control the on-board device to completely power off and Turn off all functions. In some embodiments, due to the different functions of different in-vehicle devices, even if they are all in-vehicle devices that need to maintain partial functions when the vehicle is turned off, there will be a priority based on importance or indispensability. Therefore, when the vehicle When the real-time voltage of the battery is less than the target protection voltage, some on-board equipment with lower priority can be selectively shut down, and some on-board equipment with the highest priority are reserved. When the real-time voltage of the vehicle battery is different from the target protection voltage, Then choose to turn off all on-board equipment.

According to the low-voltage protection method for vehicle equipment provided by the application, the low-voltage protection value of the vehicle battery can be dynamically adjusted according to the collected historical voltage data of the vehicle battery after the vehicle is turned off for a period of time, so that even for different brands and different styles of vehicle batteries, Under different temperature conditions and at different levels of new and old, the vehicle battery can also be adaptively protected under low voltage, effectively preventing the continuous power consumption of on-board electronic equipment caused by the low low voltage protection value and the high low voltage protection value. Turn off some functions of on-board electronic equipment too early to effectively extend the service life of the vehicle battery without affecting the functions of the on-board electronic equipment.

It should be noted that the foregoing description of the process 300 is only for example and description, and does not limit the scope of application of the present application. For those skilled in the art, various modifications and changes can be made to the process 300 under the guidance of this application. However, these amendments and changes are still within the scope of this application.

Fig. 4 is a block diagram of a low-voltage protection system for in-vehicle equipment according to some embodiments of the present application. As shown in FIG. 4, the system may include an acquisition module 410, a comparison module 420, and a determination module 430.

The obtaining module 410 may be used to obtain the target protection voltage of the vehicle battery at the current time, the vehicle battery provides power to one or more on-board devices after the vehicle is turned off, and the value of the target protection voltage is dynamically updated as time changes. In some embodiments, the acquiring module 410 further includes a sampling module 411 for acquiring historical voltage data of the vehicle battery within a preset time interval before the current time, and a target voltage determining module 412 for acquiring historical voltage data based on the historical The voltage data determines the target protection voltage. In some embodiments, the sampling module 411 is further configured to collect the battery voltage value of the vehicle after the vehicle is turned off within the preset time interval at a preset sampling frequency. In some embodiments, the target voltage determining module 412 is further configured to take a weighted average of the historical voltage data to determine the target protection voltage. In some embodiments, the target voltage determining module 412 is further configured to sort the historical voltage data and form a data sequence, filter out part of the historical voltage data at both ends of the data sequence, and determine according to the filtered data sequence The target protection voltage. In some embodiments, the target voltage determining module 412 is further configured to filter out historical voltage data of 5% at the head and 5% at the tail of the data sequence. In some embodiments, the obtaining module 410 is further configured to obtain an initial protection voltage, and determine the target protection voltage according to the initial protection voltage and the historical voltage data.

The comparison module 420 is used to compare the target protection voltage with the real-time voltage of the vehicle battery. In some embodiments, the comparison module 420 is used to detect the real-time voltage of the vehicle battery in real time, and compare the real-time voltage with the acquired target protection voltage. In some embodiments, the comparison module 420 is also used to convert voltage data into digital signals for comparison.

The determining module 430 is configured to determine an operation instruction related to the one or more vehicle-mounted devices according to the comparison result. In some embodiments, if the real-time voltage of the vehicle battery is greater than or equal to the target protection voltage, the determining module 430 may be used to determine whether the vehicle battery continues to supply power to the one or more on-board devices or The in-vehicle device continues to perform related necessary functions. In some embodiments, if the real-time voltage of the vehicle battery is less than the target protection voltage, the determining module 430 may be used to determine that the vehicle battery stops supplying power to the one or more on-board devices, or controls The vehicle-mounted device is completely powered off and all functions are turned off.

It should be understood that the system and its modules shown in FIG. 4 can be implemented in various ways. For example, in some embodiments, the system and its modules may be implemented by hardware, software, or a combination of software and hardware. Among them, the hardware part can be implemented using dedicated logic; the software part can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. Those skilled in the art can understand that the above-mentioned methods and systems can be implemented using computer-executable instructions and/or included in processor control codes, for example on a carrier medium such as a disk, CD or DVD-ROM, such as a read-only memory (firmware Such codes are provided on a programmable memory or a data carrier such as an optical or electronic signal carrier. The system and its modules of this application can not only be implemented by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc. It may also be implemented by software executed by various types of processors, or may be implemented by a combination of the foregoing hardware circuit and software (for example, firmware).

It should be noted that the above description of the candidate item display and determination system and its modules is only for convenience of description, and does not limit the present application within the scope of the examples mentioned. It can be understood that for those skilled in the art, after understanding the principle of the system, it is possible to arbitrarily combine various modules, or form a subsystem to connect with other modules without departing from this principle. For example, in some embodiments, the acquiring module 410, the comparing module 420, and the determining module 430 disclosed in FIG. 3 may be different modules in a system, or a module may implement the functions of the two or more modules mentioned above. . For example, each module may share a storage module, and each module may also have its own storage module. Such deformations are all within the protection scope of this application.

Fig. 5 is a schematic structural diagram of a protection device for vehicle-mounted equipment according to some embodiments of the present application.

In some embodiments, as shown in FIG. 5, the protection device of the vehicle-mounted equipment may include a voltage input circuit 510, a voltage conversion circuit 520, a power supply circuit 530 and a trigger circuit 540. The voltage input circuit 510 is connected to the vehicle battery and is used to receive the power provided by the vehicle battery. The power supply circuit 530 is connected to the on-board electronic device and is used to supply power to the on-board device. Between the voltage input circuit 510 and the power supply circuit 530, the power supply voltage of the vehicle battery is converted into the input voltage of the vehicle-mounted equipment. In some embodiments, a trigger circuit 540 is provided at both ends of the voltage conversion circuit 520 in parallel, and when a trigger condition is met, the trigger circuit 540 generates a corresponding control signal. In some embodiments, the trigger circuit 540 may include a voltage comparison circuit for determining the magnitude between the input voltage of the voltage input circuit 510 and a preset threshold.

In some embodiments, if the judgment result is that the input voltage is less than the preset threshold, the voltage comparison circuit may send a first signal to the voltage conversion circuit. In some embodiments, the voltage conversion circuit may stop supplying power to the on-board electronic device based on the first signal, that is, there is no voltage output at the output end of the voltage conversion circuit, and the on-board device cannot obtain a working place through the connection of the power supply circuit. The required supply voltage.

In some embodiments, if the judgment result is that the input voltage is greater than or equal to the preset threshold, the voltage comparison circuit may send a second signal to the voltage conversion circuit. In some embodiments, the voltage conversion circuit supplies power to the on-board electronic equipment through the power supply circuit based on the second signal, that is, the output terminal of the voltage conversion circuit normally outputs voltage, and the on-board equipment is connected to the power supply circuit. The supply voltage required for work can be obtained.

In some embodiments, the power supply voltage values of different types of vehicle batteries are different, for example, the standard voltage is 12V or 24V, and due to factors such as the manufacturer, the power supply voltage value also has a certain error, but it is usually kept at 12V±0.5 V and 24V±1V. In some embodiments, the rated input voltage of the vehicle-mounted device is about 5V, generally within 5V, and may be 4.0V, 4.2V, 4.5V, and so on. Therefore, in order to be suitable for converting the input voltage based on the vehicle battery voltage into the target voltage of the core chip of the on-board electronic device, the voltage conversion circuit 520 can be used to convert the voltage of the vehicle battery (for example, the vehicle battery provides a 12V supply voltage) It is converted into the power supply voltage of the core chip of the vehicle electronic equipment (usually a 5V power supply voltage), so as to prevent the malfunction of the vehicle equipment due to the overload of the input voltage. In some embodiments, the core chip of the in-vehicle device is a system on chip (SOC, System on Chip) of the in-vehicle device, which is used as a processing unit to perform functions set by the in-vehicle device.

Specifically, the protection device for vehicle-mounted equipment is connected between the vehicle battery and the core cover sheet of the vehicle-mounted electronic device, and the vehicle battery can supply power to the core cover sheet of the vehicle-mounted electronic device through the protection device for the vehicle-mounted device And provide low voltage protection function. The input end of the voltage input circuit 510 in the protection device for on-vehicle equipment is connected to the vehicle battery, and the vehicle battery provides input voltage for the voltage input circuit 510, that is, the voltage of the vehicle battery is equal to the input voltage of the voltage input circuit 510. In some embodiments, the input voltage is at most the same as the rated value of the vehicle battery voltage (for example, 12V). In practice, due to the loss of the vehicle battery, the input voltage is lower than the rated voltage of the vehicle battery, that is, less than 12V. In order to be suitable for converting the input voltage based on the vehicle battery voltage into the target voltage of the core chip of the on-board electronic device, the voltage conversion circuit 520 may be used to convert the input voltage into the target voltage of the core chip of the on-board device for power supply. Voltage. In some embodiments, the target voltage of different in-vehicle devices may be different, and is generally between 4.2V and 5V. In some embodiments, when the voltage conversion circuit 520 outputs the voltage to the power supply circuit, the protection device of the on-board equipment may control the output of the voltage according to the signal output by the voltage comparison circuit in the trigger circuit.

In some embodiments, the trigger circuit 540 is disposed between the voltage input circuit 510 and the power supply circuit 530 and is connected in parallel with the voltage conversion circuit 520, and is used to compare the input voltage of the voltage input circuit 510 with a preset value. The threshold is compared. When the input voltage is less than the preset threshold, the voltage comparison circuit outputs a first signal, and the first signal is used to make the voltage conversion circuit 520 turn off the output of the voltage, so that the voltage output by the voltage conversion circuit is OV (reference Ground voltage, generally refers to the negative pole of the power supply), and the low-voltage protection function takes effect. At this time, the vehicle battery no longer supplies power to the on-board electronic equipment.

In some embodiments, during the process of comparing the voltage input circuit 510 with the preset threshold, when the input voltage is greater than or equal to the preset threshold, the voltage comparison circuit outputs a second signal, and the second signal causes the voltage to The conversion circuit 520 turns on the output of the voltage, so that the voltage output by the voltage conversion circuit is the target voltage, ensuring continuous power supply for the on-board electronic equipment.

According to the protection device for on-vehicle electronic equipment shown in some embodiments of the present application, a circuit for voltage comparison is built based on simple electronic devices, and the input voltage derived from the vehicle battery voltage is compared with a preset threshold to achieve monitoring The voltage of the vehicle battery can realize the effect of low voltage protection of the vehicle battery. The circuit is simple in design and low in cost, reduces hardware costs, improves the stability of battery low-voltage protection, and can effectively prevent vehicle battery exhaustion caused by continuous power consumption of on-board electronic equipment, avoid damage to vehicle batteries, and extend vehicle batteries Service life.

In some embodiments, the preset threshold is a preset low voltage protection value, for example, it may be between 11.1V and 11.5V, and the preferred preset threshold may be 11.3V. The voltage comparison circuit compares the input voltage with a preset threshold of 11.3V, and when the input voltage is less than the preset threshold of 11.3V, outputs a signal that causes the voltage conversion circuit to turn off the supply voltage. In some embodiments, the preset threshold may be the target protection voltage of the vehicle battery at the current time in the low-voltage protection method for on-board equipment shown in FIG. 3, and since the target protection voltage may be dynamically updated over time, the The preset threshold can also be updated accordingly.

In order to facilitate the conversion of the output signal of the voltage comparison circuit in the trigger circuit into the change signal of the enable signal, in some embodiments, the trigger circuit may further include a conversion unit for converting the output signal of the voltage comparison circuit into Enable signal. The input terminal of the voltage comparison circuit is connected to the output terminal of the voltage input circuit 510, the output terminal of the voltage comparison circuit is connected to the input terminal of the conversion unit, and the output terminal of the conversion unit is connected to the voltage The conversion circuit 520 is connected.

Specifically, in some embodiments, when the input voltage is greater than or equal to the preset threshold, the voltage comparison circuit outputs a high-level signal to the conversion unit, and the conversion unit converts the high The level signal is converted into a second signal indicating that the enable signal is reduced; when the input voltage is less than the preset threshold, the voltage comparison circuit outputs a low-level signal to the conversion unit, and the conversion unit The low-level signal is converted into a first signal indicating that the enable signal is boosted.

In some embodiments, the conversion unit may be any device that converts the high and low level signals output by the voltage comparison circuit into a signal indicating whether the voltage conversion circuit outputs or does not output voltage. In some implementations, the conversion unit may be a triode, wherein the output terminal of the voltage comparison circuit is connected to the base of the triode; the collector of the triode is connected to the voltage conversion circuit, and the output of the triode is connected to the voltage conversion circuit. The emitter is grounded.

Specifically, in some embodiments, when the input voltage is greater than or equal to the preset threshold, the transistor is turned on, and the voltage comparison circuit outputs a high-level signal to the base of the transistor, The collector of the triode outputs a second signal representing the decrease of the enable signal to the voltage conversion circuit. In some embodiments, when the input voltage is less than the preset threshold, the triode is turned off, and the voltage comparison circuit outputs a low-level signal to the base of the triode, and the collector of the triode The electrode outputs to the voltage conversion circuit a first signal indicating that the enable signal is boosted.

Further, in some embodiments, in order to enable the voltage comparison circuit to determine between the input voltage and the preset threshold, the voltage comparison circuit may include a comparator and at least one connected to the comparator. A resistor. In some embodiments, the preset threshold may be adjusted by the resistor, and when the target protection voltage is updated, the resistance of the resistor may be adjusted to achieve the purpose of updating the preset threshold. In some embodiments, since the target protection voltage can be updated every day, the resistance value of the resistor also needs to be updated accordingly, and the resistance may be a resistor that is convenient to adjust the resistance value.

Some embodiments of the present application also provide a protection method for vehicle-mounted equipment, which is applied to the protection device for vehicle-mounted equipment as described above, wherein the protection device for vehicle-mounted equipment includes a voltage input circuit, a voltage conversion circuit, a power supply circuit, and a trigger The circuit, when the trigger condition is met, the trigger circuit generates a corresponding control signal. In some embodiments, the method for protecting the vehicle-mounted equipment may include comparing the input voltage of the voltage input circuit with a preset threshold, corresponding to the input voltage being less than the preset threshold, generating a first signal, and based on the The first signal stops supplying power to the vehicle-mounted device; corresponding to the input voltage being greater than or equal to the preset threshold, a second signal is generated, and based on the second signal, the power supply circuit is used to supply the vehicle-mounted device Power supply for electronic equipment. In some embodiments, the preset threshold may range from 11.1V to 11.5V, and the output voltage of the voltage conversion circuit is used as the power input voltage of the vehicle-mounted device, and the range may be 4.2V to 5V.

The protection device of the vehicle-mounted equipment will be explained in detail below in conjunction with specific implementations.

Fig. 6 is a schematic circuit diagram of a protection device for vehicle-mounted equipment according to some embodiments of the present application.

As shown in FIG. 6, in some embodiments, the voltage conversion circuit may at least include a direct current buck (DCDC, also referred to as high-voltage (low-voltage) direct current power conversion to low-voltage (high-voltage) direct current power supply), such as a DCDC device U900, one end of the DC step-down device is connected to the voltage input circuit, and the other end is connected to the power supply circuit, and is used to convert the power supply voltage of the vehicle battery into the input voltage of the vehicle equipment. For example, the DCDC device U900 can be a single-chip microcomputer. It should be understood that the use of a DC step-down converter to convert between high voltage and low voltage is only a preferred embodiment proposed in this embodiment. In actual use, other devices or other forms of conversion circuits can be selected according to the actual situation, as long as It suffices that the conversion between high pressure and low pressure can be realized, which is not limited in this embodiment.

In some embodiments, the voltage comparison circuit may include a comparator U901 for comparing the magnitude between the input voltage of the voltage input circuit and a preset threshold. In some embodiments, the voltage comparison circuit may further include a resistor R911, a resistor R905, a resistor R929, a resistor R902, a resistor R934, a resistor R945, a resistor R946, a resistor R950, a capacitor C911, a capacitor C905, a capacitor C903, and a transistor Q904. Wherein, one end of the parallel connection of the resistors R911 and R905 is connected to the voltage input circuit, the other end of the parallel connection of the resistors R911 and R905 is connected to the inverting input end of the comparator U901, the capacitor C911, the resistor R929 and The resistor R902 is connected in parallel between the inverting input terminal of the comparator U901 and the ground, the resistor R945 and the capacitor C903 are connected in parallel between the positive input terminal of the comparator U901 and the ground, and the resistor R946 is connected to the positive input of the comparator U901. Between the terminal and the output terminal, the resistor R950 is connected between the positive power terminal and the positive input terminal of the comparator U901, the negative power terminal of the comparator U901 is grounded, and the resistor R934 is connected between the positive input terminal and the positive input terminal of the comparator U901. Between pins 5 of the comparator U901, the positive power terminal of the comparator U901 is grounded through a capacitor C905, the input terminal of the chip U907 is connected to the voltage input circuit, and the output terminal of the chip U907 is connected to the positive terminal of the comparator U901. The power supply terminal is connected, the comparator U901 is connected to the base of the transistor Q904 through the resistor R1, the emitter of the transistor Q904 is grounded, and the collector of the transistor Q904 is connected to the enable of the DCDC chip in the voltage conversion circuit end.

In the circuit of the protection device for in-vehicle electronic equipment shown in Figure 6, VCC_BM is the input voltage of the voltage input circuit based on the battery voltage of the vehicle, generally initially 12V, and VBUS is the target voltage for the power supply of the core chip of the in-vehicle electronic equipment , Generally set between 4.2V and 5V. In some embodiments, the vehicle battery voltage enters the voltage conversion circuit as an input voltage through the voltage input circuit, and the voltage conversion circuit performs voltage conversion, and outputs a target voltage of, for example, 4.2V-5V, which is provided to the core chip of the vehicle electronic device. In some embodiments, in the voltage comparison circuit, the preset threshold value can be adjusted by adjusting the resistance value of the resistor connected to the comparator U901, for example, adjusting the resistance value of the resistors R950 and R934.

In some embodiments, when the input voltage is greater than or equal to the preset threshold, the output of the comparator U901 is a high-level signal, the transistor Q904 is turned on, the enable signal DCDC_EN is reduced and the second signal is output, and the voltage conversion circuit The DCDC device U900 takes effect and outputs a target voltage of 4.2V～5V. In some embodiments, when the input voltage is less than the preset threshold, the output of the comparator U901 is a low-level signal, the transistor Q904 is turned off, the enable signal DCDC_EN is pulled high and the first signal is output, the DCDC device in the voltage conversion circuit U900 is turned off, there is no voltage output, the VBUS voltage is OV, and the low voltage protection function takes effect. The voltage comparison circuit is implemented based on simple electronic devices, has simple design and low cost, reduces the hardware cost of the on-board electronic equipment, and helps to improve the stability of the low-voltage protection of the vehicle battery.

On the other hand, some embodiments of the present application also provide a vehicle-mounted device, which includes the above-mentioned protection device for the vehicle-mounted device.

According to the in-vehicle equipment shown in some embodiments of the present application, a circuit for voltage comparison is built based on simple electronic devices, and the input voltage derived from the vehicle battery voltage is compared with a preset threshold, so as to monitor the vehicle battery voltage and realize the vehicle The effect of battery low voltage protection. The circuit is simple in design and low in cost, reduces hardware costs, improves the stability of battery low-voltage protection, and can effectively prevent vehicle battery exhaustion caused by continuous power consumption of on-board electronic equipment, avoid damage to vehicle batteries, and extend vehicle batteries Service life.

Fig. 7 is an exemplary flowchart of a monitoring method for a vehicle-mounted device according to some embodiments of the present application. In some embodiments, one or more steps in the process 700 may be implemented by the server 110 or a processing device provided on the vehicle-mounted device 130.

Step 710: Obtain the associated parameters of the vehicle-mounted device; the associated parameters can reflect the working state of the vehicle-mounted device.

In some embodiments, the vehicle-mounted equipment may be different types of electronic equipment with additional functions applied to the vehicle, and may include a driving recorder, a vehicle audio, a vehicle display device, a vehicle GPS, a vehicle WIFI, a vehicle alarm system, etc. Electronic equipment. In some embodiments, the in-vehicle device may include a normal working state and an abnormal working state. Among them, the normal working state and the abnormal working state respectively include the normal working state and the abnormal working state of the on-board equipment when the vehicle is running normally; and the low power consumption state and the abnormal working state of the on-board equipment when the vehicle is turned off. For the related description of the working status of the vehicle equipment, please refer to other parts of this manual, so I won't repeat it here.

In some embodiments, the related parameters of the vehicle-mounted device are related parameters that can reflect the working state of the vehicle-mounted device. By simply processing the related parameters, the working state of the vehicle-mounted device can be determined. In some embodiments, the associated parameters of the vehicle-mounted device may include the operating current of the vehicle-mounted device and/or the heating temperature of the vehicle-mounted device. In some embodiments, when the vehicle-mounted equipment is in different working states, the working current of the vehicle-mounted device is different. For example, the working current of a vehicle-mounted device in the normal working state is 1A, and the working current in the abnormal working state is 1A. The current is 1.5A, so the working status of the vehicle-mounted equipment can be judged by monitoring the working current. In some embodiments, when the heating temperature of the vehicle-mounted device is too high, it means that the working current through the vehicle-mounted device is too large. Therefore, the working current and the working state of the vehicle-mounted device can be reflected to a certain extent. In some embodiments, the associated parameters may also include other data that can reflect the working status of the on-board equipment, for example, the power consumption speed of the vehicle battery.

In some embodiments, when the associated parameter of the vehicle-mounted device includes the operating current of the vehicle-mounted device, the operating current of the vehicle-mounted device may be obtained to determine the operating state of the vehicle-mounted device. In some embodiments, the operating current of the vehicle-mounted device can be obtained by obtaining the voltage across the vehicle-mounted device and the resistance of the vehicle-mounted device. In some embodiments, it is also possible to obtain the voltage across the resistor connected in series with the vehicle device, and determine the corresponding current based on the resistance value of the resistor and the voltage across the resistor, and the current can reflect the current flowing through the Operating current of on-board equipment. In some embodiments, in order to determine the current of the vehicle-mounted device, a specific solution may be to provide a sampling resistor in the monitoring device of the vehicle-mounted device, and connect the sampling resistor in series with the power supply of the vehicle-mounted device. When the vehicle-mounted device is working, the current flowing through the sampling resistor is the working current of the vehicle-mounted device. By measuring the voltage across the sampling resistor, the current of the sampling resistor can be directly calculated according to the calculation formula I=U/R.

In some embodiments, in order to ensure the consistency of the data collected in different vehicle-mounted devices, the sampling resistor may be a high-precision resistor with a resistance error of less than 5%. In some embodiments, the sampling resistor can be a high-precision resistor with a resistance error of less than 4.5%. In some embodiments, the sampling resistor can be a high-precision resistor with a resistance error of less than 4%. In some embodiments, the sampling resistor can be a high-precision resistor with a resistance error of less than 3.5%. In some embodiments, the sampling resistor can be a high-precision resistor with a resistance error of less than 3%. In some embodiments, the sampling resistor can be a high-precision resistor with a resistance error of less than 2.5%. In some embodiments, the sampling resistor can also be a high-precision resistor with a resistance error of less than 2%. In some embodiments, the sampling resistor may be a high-precision resistor with a resistance error of less than 1.5%. In some embodiments, the sampling resistor may preferably use a high-precision resistor with a resistance error of less than or equal to 1%. In some embodiments, the sampling resistor can be a high-precision resistor with a resistance error of less than 0.5%. By using the resistance within the above resistance error range, the consistency of the data collected by the vehicle-mounted equipment can be guaranteed within a certain range. For example, if a high-precision resistor with a resistance error within 1% is used, if the input voltage is consistent, the error between the collected voltage and the final calculated operating current is also within 1%.

In some embodiments, in order to ensure that the introduction of the sampling resistor will not increase the power consumption of the power supply of the vehicle-mounted device, a resistor with a resistance value within 1 ohm can be selected. In some embodiments, the sampling resistor can be a resistor of 0.1-0.5 ohm. In some embodiments, the sampling resistor can be a resistor of 0.05-0.1 ohm. In some embodiments of the present application, a high precision resistance of 0.1 ohm or 0.056 ohm is preferred. For example, if the resistance of the sampling resistor is selected to be less than 0.5 ohms, according to the power consumption calculation formula W=I ² *R, when the current flowing through the sampling resistor is 1A, the power consumption of this part of the circuit will increase by 0.05W Within, the power consumption of the whole machine is basically negligible compared to the vehicle equipment.

In some embodiments, when the associated parameter of the vehicle-mounted device includes the heating temperature of the vehicle-mounted device, acquiring the associated parameter of the vehicle-mounted device may include: detecting the heating temperature of the vehicle-mounted device through a temperature sensor. If the vehicle equipment is in abnormal working condition for a long time, the working current will be greater than the rated working current, which will gradually increase the temperature of the vehicle equipment. Therefore, the heating temperature of the vehicle equipment can reflect the working state of the vehicle equipment to a certain extent. In some embodiments, a temperature sensor may be directly provided in the monitoring device of the vehicle-mounted equipment to measure the heating temperature of the vehicle-mounted equipment. In some embodiments, a thermistor may be provided in the vehicle-mounted device, and its resistance may vary with temperature. The heating temperature of the vehicle-mounted device can be obtained by measuring changes in certain parameters of the thermistor, for example, the voltage change value, Resistance change value, etc. In some embodiments, when the detected heating temperature reaches a certain preset value, related subsequent operations may be performed, for example, turning off the power of the vehicle-mounted device.

In some embodiments, a sampling period can be set to obtain the relevant parameters of the vehicle-mounted device, and the sampling period can be understood as the interval time between two collections of the voltage across the sampling resistor or the heating temperature of the vehicle-mounted device. In some embodiments, the relevant parameters of the vehicle-mounted device can be obtained in real time, but when the relevant parameters include the operating current of the vehicle-mounted device, in order to exclude the situation caused by the transient current abnormality, a sampling period of more than 1 second can usually be set. In some embodiments, the sampling period may be a period of 1 second to 60 seconds for monitoring in units of seconds, such as 5 seconds, 10 seconds, 20 seconds, etc., or it may be a period of 1 minute to 60 minutes in units of minutes. The monitoring period, such as 5 minutes, 10 minutes, 30 minutes, etc. In some embodiments, the sampling period can be set according to factors such as different usage scenarios, different vehicle models, and different time periods. It can be a fixed value or can be automatically adjusted according to usage conditions. For example, when the battery power of the vehicle is low, the sampling period can be shorter, and the monitoring is performed in seconds. When the battery power of the vehicle is large, the sampling period can be slightly longer, in minutes. Monitor for the unit. In some embodiments, in order to prevent the battery power of the vehicle from being used up by the vehicle-mounted equipment in an abnormal working state or most of the power is lost, the sampling period cannot be too long, preferably not more than 1 hour. In some embodiments, in addition to setting the sampling period, related parameters of the vehicle-mounted device can also be obtained in real time, that is, the voltage across the sampling resistor or the heating temperature of the vehicle-mounted device can be monitored in real time. In some embodiments, the voltage value across the sampling resistor can be collected in real time, and the current value passing through the sampling resistor, that is, the operating current of the vehicle-mounted device, can be calculated in real time. In some embodiments, the heating temperature of the vehicle-mounted device can be monitored in real time through a temperature sensor or a thermistor. In some embodiments, real-time acquisition of the relevant parameters of the vehicle-mounted equipment can reflect the working status of the vehicle-mounted equipment in real time, and take corresponding measures in time to reduce the power consumption of the vehicle battery when it is detected that the vehicle is in an abnormal working state.

Step 720: Determine operation instruction information related to the in-vehicle device based on the associated parameter and the corresponding preset threshold. In some embodiments, the preset threshold corresponding to the associated parameter may be preset to determine the working state of the vehicle-mounted device. In some embodiments, when the associated parameter is the operating current of the vehicle-mounted device, the preset threshold corresponding to the associated parameter may be a certain current value, and when the associated parameter is the heating temperature of the vehicle-mounted device, the preset threshold corresponding to the associated parameter It can be a certain temperature value. In some embodiments, the preset threshold value may be a certain current value or temperature value, or may be a proportional threshold value that exceeds the current value or temperature value when the vehicle-mounted device is in a normal working state. For example, the preset threshold value may also be a ratio of 10%. , 30% and 50%, etc. In some embodiments, the preset threshold may be data measured in a laboratory by a designer, manufacturer, etc. of the vehicle-mounted device, and may also be updated according to the situation during subsequent use. In some embodiments, the preset thresholds corresponding to different usage scenarios, different vehicle models, and different time periods can be set to different values, and can be updated according to usage conditions.

In some embodiments, the preset threshold may include a plurality of different thresholds to determine the degree of abnormality of the vehicle-mounted device. When it is determined that the associated parameter is within the corresponding preset threshold range, the vehicle-mounted device may be allowed to execute the corresponding Operation instructions. For example, the preset threshold may include a reference threshold, a first threshold, a second threshold, a third threshold, etc., which are generally greater than the value when the vehicle-mounted device is in a normal working state.

In some embodiments, the preset threshold may include a reference threshold; when the associated parameter is greater than the reference threshold, it is determined that the operation instruction information is a cut-off operation instruction; wherein, the cut-off operation includes cutting off the vehicle battery to the Power transfer between in-vehicle devices.

In some embodiments, the preset threshold may only include a reference threshold, and the reference threshold may be set to exceed 0% or more of the value when the vehicle-mounted device is in a normal working state. In some embodiments, the reference threshold may be set to exceed 10% to 100% of the value when the vehicle-mounted device is in a normal working state. In some embodiments, the reference threshold may be set to exceed 10% to 50% of the value when the vehicle-mounted device is in a normal working state or other applicable values. For example, the reference threshold may be set to exceed 50% of the value of the vehicle-mounted device in the normal working state, and when the value of the detected related parameter is greater than 50% of the value of the vehicle-mounted device in the normal working state, the cut-off operation instruction may be performed . In some embodiments, the power supply of the vehicle battery needs to be powered by the vehicle battery, and because the power supply voltage of the vehicle battery does not match the rated input voltage of the power supply of the vehicle device, the power supply voltage of the vehicle battery needs to be converted by a conversion circuit. In some embodiments, the cut-off operation instruction may include operations such as turning off the output of the conversion circuit to the vehicle-mounted device to cut off the power of the vehicle-mounted device or directly shutting down the vehicle-mounted device.

In some embodiments, when the monitoring method of the in-vehicle device is executed by the server 110, the server 110 can issue an instruction to the vehicle through the network to turn off the output of the conversion circuit, thereby cutting off the power of the in-vehicle device, or the server 110 can provide the vehicle to the vehicle. The device 130 issues a shutdown instruction. In some embodiments, when the monitoring method of the in-vehicle device is executed by the in-vehicle device 130, the in-vehicle device 130 may notify the vehicle to turn off the output of the conversion circuit through the connection with the vehicle, thereby cutting off the power of the in-vehicle device, or The device 130 can directly shut down automatically.

In some embodiments, the preset threshold further includes a first threshold, and the first threshold is greater than the reference threshold; when the associated parameter exceeds the reference threshold and is within the first threshold, it is determined The operation instruction information is a reminder operation instruction; when the associated parameter exceeds the first threshold, it is determined that the operation instruction information is a cut-off operation instruction.

In some embodiments, the preset threshold may include a reference threshold and a first threshold, and in comparison, the first threshold is greater than the reference threshold. In some embodiments, both the reference threshold and the first threshold may be set to 0% or more, 0% to 100%, 10% to 50% or other applicable values that exceed the value when the vehicle-mounted device is in a normal working state. It is only necessary to set the first threshold to be greater than the reference threshold. For example, the reference threshold may be set to exceed 20% of the value when the vehicle-mounted device is in the normal working state, and the first threshold may be set to exceed 50% of the value when the vehicle-mounted device is in the normal working state. When the value of the detected related parameter is within the range of 20% to 50% of the value of the vehicle-mounted device in the normal working state, a reminder operation instruction can be performed; when the value of the detected related parameter is greater than the value of the vehicle-mounted device in the normal working state When the value is 50%, the cut-off operation instruction can be executed.

In some embodiments, the reminding operation instruction may be through the vehicle-mounted device 130 or the vehicle user terminal 140 to remind the vehicle user that the vehicle-mounted device may be in an abnormal working state, and the reminding method includes text reminding, voice reminding and other forms. In some embodiments, when the monitoring method of the vehicle-mounted device is executed by the server 110, if the associated parameter exceeds the first threshold, the server 110 may turn off the output of the conversion circuit, thereby cutting off the power supply of the vehicle-mounted device, or the server 110 may issue a shutdown instruction to the vehicle-mounted device 130. In some embodiments, when the monitoring method of the vehicle-mounted device is executed by the server 110, if the associated parameter exceeds the reference threshold, the server 110 may issue instructions to the vehicle-mounted device through the network within the first threshold. To remind the vehicle user in various ways, the server 110 may also send information to the vehicle user terminal via the network to remind the vehicle user. In some embodiments, when the monitoring method of the vehicle-mounted device is executed by the vehicle-mounted device 130, if the associated parameter exceeds the first threshold, the vehicle-mounted device 130 may notify the vehicle to close the conversion circuit through the connection with the vehicle. In this way, the power of the vehicle-mounted device is cut off, or the vehicle-mounted device 130 can be directly shut down automatically. In some embodiments, when the monitoring method of the in-vehicle device is executed by the in-vehicle device 130, if the associated parameter exceeds the reference threshold, the in-vehicle device 130 may directly remind in various ways within the first threshold. Vehicle users.

In some embodiments, the preset threshold further includes a second threshold, and the second threshold is greater than the reference threshold and less than the first threshold; when the associated parameter exceeds the reference threshold, the second threshold When it is within the second threshold, it is determined that the operation instruction information is a reminder operation instruction; when the associated parameter exceeds the second threshold and is within the first threshold, it is determined that the operation instruction information is a power management operation instruction; when When the associated parameter exceeds the first threshold, it is determined that the operation instruction information is a cut-off operation instruction.

In some embodiments, the preset threshold may include a reference threshold, a first threshold, and a second threshold. In comparison, the first threshold is greater than the reference threshold, and the second threshold is greater than the reference threshold and less than the first threshold. In some embodiments, the reference threshold, the first threshold, and the second threshold can all be set to 0% or more, 0% to 100%, 10% to 50%, or other values that exceed the value of the vehicle-mounted device in the normal working state. The applicable value only needs to set the first threshold to be greater than the reference threshold, and the second threshold to be greater than the reference threshold and less than the first threshold. For example, the reference threshold may be set to exceed 10% of the value when the vehicle-mounted device is in the normal working state, the first threshold may be set to exceed 50% of the value when the vehicle-mounted device is in the normal working state, and the second threshold It can be set to exceed 20% of the value when the in-vehicle device is in normal working condition. When the value of the detected related parameter is within the range of 10% to 20% of the value when the on-board device is in the normal working state, a reminder operation instruction can be performed; when the value of the detected related parameter is in the normal working state of the on-board device When the value is within the range of 20% to 50%, the power management operation instruction can be executed; when the detected value of the associated parameter is greater than 50% of the value in the normal working state of the in-vehicle device, the shutdown operation instruction can be executed.

In some embodiments, the power management operation instruction may be to close some unnecessary programs in the vehicle or the vehicle-mounted device, that is, to manage the application program, so as to reduce the power consumption of the vehicle or the vehicle-mounted device. In some embodiments, when the monitoring method of the vehicle-mounted device is executed by the server 110, if the associated parameter exceeds the first threshold, the server 110 may turn off the output of the conversion circuit, thereby cutting off the power supply of the vehicle-mounted device, or the server 110 may issue a shutdown instruction to the vehicle-mounted device 130. In some embodiments, when the monitoring method of the in-vehicle device is executed by the server 110, if the associated parameter exceeds the second threshold, the server 110 may issue the issue to the in-vehicle device via the network within the first threshold. Instructions to close unnecessary applications to reduce power consumption. In some embodiments, when the monitoring method of the in-vehicle device is executed by the server 110, if the associated parameter exceeds the reference threshold, the server 110 may issue instructions to the in-vehicle device through the network within the second threshold. To remind the vehicle user in various ways, the server 110 may also send information to the vehicle user terminal via the network to remind the vehicle user. In some embodiments, when the monitoring method of the in-vehicle device is executed by the in-vehicle device 130, if the associated parameter exceeds the first threshold, the in-vehicle device 130 may notify the vehicle to close the conversion circuit through the connection with the vehicle. In this way, the power of the vehicle-mounted device is cut off, or the vehicle-mounted device 130 can be directly shut down automatically. In some embodiments, when the monitoring method of the in-vehicle device is executed by the in-vehicle device 130, if the associated parameter exceeds the second threshold, the in-vehicle device 130 can shut down unnecessary parameters by itself within the first threshold. Application to reduce power consumption. In some embodiments, when the monitoring method of the in-vehicle device is executed by the in-vehicle device 130, if the associated parameter exceeds the reference threshold, the in-vehicle device 130 may prompt directly within the second threshold. Vehicle users.

In some embodiments, since the in-vehicle device includes two normal working states in the vehicle operating state and the vehicle stalled state, it is necessary to set corresponding preset thresholds respectively according to the above two normal working states. In some embodiments, when the corresponding preset thresholds are set according to the above two normal operating states, the corresponding preset thresholds can also be selected according to the current operating state of the vehicle (for example, whether the vehicle is in a normal operating state or in an off state). The threshold value judges the working status of the vehicle-mounted equipment. In some embodiments, the current operating state of the vehicle may also be determined through the user's external input, and then the corresponding preset threshold value may be selected to determine the operating state of the vehicle-mounted device. For example, the user determines whether the vehicle is in the normal operating state or the off state by selecting a button on the vehicle-mounted device. In some embodiments, it is also possible to only detect whether the vehicle is in a normal state when the vehicle is turned off, that is, a low power consumption state, and at this time, it is only necessary to set a preset threshold corresponding to the scene.

Fig. 8 is a block diagram of a monitoring system of a vehicle-mounted device according to some embodiments of the present application. As shown in FIG. 8, the system may include an acquisition module 810 and a determination module 820.

The obtaining module 810 may be used to obtain associated parameters of the vehicle-mounted device, and the associated parameters can reflect the working state of the vehicle-mounted device. The determining module 820 may be configured to determine operation instruction information related to the in-vehicle device based on the associated parameter and the corresponding preset threshold.

Fig. 9 is a schematic structural diagram of a monitoring device for a vehicle-mounted device according to some embodiments of the present application. Fig. 10 is a schematic diagram of the connection between a vehicle battery and an on-board equipment power supply according to some embodiments of the present application. Fig. 11 is another schematic structural diagram of a monitoring device for a vehicle-mounted device according to some embodiments of the present application. Fig. 12 is a schematic circuit diagram of a monitoring device of a vehicle-mounted device according to some embodiments of the present application.

As shown in FIG. 9, the monitoring device of the vehicle-mounted equipment may include a power supply 910 of the vehicle-mounted equipment, a sampling resistor 920, a collection unit 930, and a processing unit 940. The power supply 910 of the vehicle-mounted device is used to supply power to the internal structure of the vehicle-mounted device, including the sampling resistor 920, the collection unit 930, and the processing unit 940. The sampling resistor 920 is a resistance element disposed between the processing unit 940 and the power supply 910 of the vehicle-mounted device, and the current passing through the sampling resistor can be calculated by measuring the voltage value of the sampling resistor 920. The processing unit 940 is the core processor of the vehicle-mounted device, used to implement different functions of the vehicle-mounted device, and is connected in series with the sampling resistor. The collecting unit 930 is a measuring unit connected in parallel to the two ends of the sampling resistor 920 and is used to measure the voltage value across the sampling resistor 920.

As shown in FIG. 10 and FIG. 12, the power supply 910 of the vehicle-mounted device is powered by a vehicle battery 960. In some cases, the power supply voltage of the vehicle battery 960 does not match the rated input voltage of the power supply 910 of the on-board equipment. Therefore, a conversion circuit 950 is provided between the vehicle battery 960 and the power supply 910 of the on-board equipment for connecting the vehicle battery 960 The power supply voltage is converted into the rated input voltage of the power supply 910 of the on-board equipment. As shown in Figure 12, VIN is the power supply voltage of the vehicle battery. After the conversion circuit, the output voltage to the vehicle equipment is VCC, which is the power input voltage of the vehicle equipment. In some embodiments, the power supply voltage values of different types of vehicle batteries are different. As far as the current situation is concerned, the general standard voltage is 12V or 24V, and due to factors such as the manufacturer, the power supply voltage value also has a certain error, but usually Keep within the range of 12V±0.5V and 24V±1V. In some embodiments, due to different states of the vehicle, such as engine startup, the power supply voltage value of the vehicle battery may deviate more from the standard voltage. In some embodiments, the rated input voltage of the power supply 910 of the vehicle-mounted device is generally within 5V, and may be 4.0V, 4.2V, 4.5V, or the like. In some embodiments, as shown in FIG. 5, the output terminal of the vehicle battery 960 (that is, the power supply of the vehicle) is connected to the conversion circuit 950, and the voltage of 12V or 24V is output by the conversion circuit 950 as the rated input voltage of the power supply 910 of the vehicle equipment. , For example, 4.2V, so as to prevent malfunctions caused by overloading of on-board equipment due to excessive input voltage. For example, the power supply voltage VIN of the vehicle battery in FIG. 10 is 12V. After the voltage conversion circuit, the converted voltage VCC is 4.2V, which can be used as the power input voltage of the vehicle equipment.

In some embodiments, the capacity of the vehicle battery is greater than 50Ah, and the current of the vehicle-mounted device is within 1A when the vehicle is in a normal working state. When the vehicle is turned off, the normal vehicle-mounted device will reduce its own power consumption to control it, for example, within 20mA . If the on-board equipment is in an abnormal working state, it will continue to consume electricity close to 1A after the vehicle is turned off. Taking the vehicle battery capacity of 50Ah as an example, theoretically, the battery can be exhausted in about 50 hours. If the battery is exhausted several times, the vehicle battery will be greatly lost, and the battery will also accelerate the aging speed and shorten the battery life.

In some embodiments, the input voltage (for example, 4.2V) of the power supply 910 of the vehicle-mounted device is converted to VBAT after passing through the sampling resistor 920, which is used to directly supply power to the processing unit 940 and other components of the vehicle-mounted device. Among them, VBAT is the voltage supplied to other components of the on-board equipment except the sampling resistor, and the current flowing through the sampling resistor 920 is the working current of the on-board device. As shown in Figure 7, the power input voltage of the vehicle-mounted device is VCC, and after the sampling resistor R0 is set, the power supply voltage for other components of the vehicle-mounted device is VBAT. In some embodiments, even for different components of the same model, the collected voltage and the calculated current are different due to the deviation of the resistance, but the actual working current may be the same. In some embodiments, in order to ensure the consistency of the data collected in different vehicle-mounted devices, the sampling resistor 920 may be a high-precision resistor with a resistance error of less than 5%. In some embodiments, the sampling resistor 920 may preferably use a high-precision resistor with a resistance error of less than or equal to 1%, so that when the input voltage is consistent, the error between the collected voltage and the final calculated working current is also Within 1%. In some embodiments, the sampling resistor 920 can also use other high-precision resistors with higher accuracy. Further, in order to ensure that the introduction of the sampling resistor will not increase the power consumption of the vehicle battery, a sampling resistor 920 with a smaller resistance value can be selected. In some embodiments, the sampling resistor 920 can be a resistance less than or equal to 1 ohm. In some embodiments, the sampling resistor 920 can be a resistor of 0.1-0.5 ohm. In some embodiments, the sampling resistor 920 can be a resistor of 0.05-0.1 ohm. In some embodiments, the sampling resistor 920 can also be selected to be less than 0.05 ohm or other smaller resistance. In some embodiments of the present application, it is preferable to select a high-precision resistor of 0.1 ohm or 0.056 ohm. For example, if the resistance of the sampling resistor is selected to be less than 0.05 ohms, according to the power consumption calculation formula W=I ² *R, when the current flowing through the sampling resistor 920 is 1A, the power consumption of this part of the circuit will increase by 0.05 Within W, the power consumption of the whole machine is basically negligible compared to the vehicle equipment.

The collection unit 930 is configured to collect the voltage across the sampling resistor 920 in real time. Its input terminal is connected to both ends of the sampling resistor 920, and the output terminal is connected to the processing unit 940 for outputting the collected voltage value to the processing unit 940. For further processing. In some embodiments, the acquisition unit 930 may use an analog-to-digital converter (ADC, Analog to Digital Converter) to collect the voltage value across the sampling resistor 920 at a preset sampling period during use, and convert it into an analog signal. After being a digital signal, it is output to the processing unit 940 for processing. Wherein, the sampling period is a period for collecting the voltage value at both ends of the sampling resistor twice. In some embodiments, the acquisition unit 930 can monitor the voltage across the sampling resistor 920 in real time, but in order to exclude the situation caused by the abnormal instantaneous current, the sampling period within 1 second can usually be excluded. In some embodiments, the sampling period may be a period of 1 to 60 seconds for monitoring in seconds, such as 5 seconds, 10 seconds, 20 seconds, etc., or it may be a period of 1 to 60 minutes for monitoring in minutes. Period, such as 5 minutes, 10 minutes, 30 minutes, etc. In some embodiments, the sampling period can be set according to factors such as different usage scenarios, different vehicle models, and different time periods. It can be a fixed value or can be automatically adjusted according to usage conditions. Further, in order to prevent the battery power of the vehicle from being used up by the on-board equipment in an abnormal working state or most of the power is lost, the sampling period should not be too long, preferably not more than 1 hour. In some embodiments, in addition to setting the sampling period, related parameters of the vehicle-mounted device can also be obtained in real time, that is, the voltage across the sampling resistor or the heating temperature of the vehicle-mounted device can be monitored in real time. In some embodiments, the voltage value across the sampling resistor can be collected in real time, and the current value passing through the sampling resistor, that is, the operating current of the vehicle-mounted device, can be calculated in real time. In some embodiments, the heating temperature of the vehicle-mounted device can be monitored in real time through a temperature sensor or a thermistor. In some embodiments, real-time acquisition of the relevant parameters of the vehicle-mounted equipment can reflect the working status of the vehicle-mounted equipment in real time, and take corresponding measures in time to reduce the power consumption of the vehicle battery when it is detected that the vehicle is in an abnormal working state.

In some embodiments, as shown in FIG. 11, the first input end of the acquisition unit 930 is connected to one end of the first protection resistor 301, and the other end of the first protection resistor 301 is connected to one end of the sampling resistor 920. The second input terminal is connected to one end of the second protection resistor 302, and the other end of the second protection resistor 302 is connected to the other end of the sampling resistor 920 to protect the monitoring device, or the first protection resistor 301 and the second protection resistor 302 is replaced with anti-interference components to improve the anti-interference ability of the monitoring device. For example, as shown in Figure 12, anti-interference components NC33 and NC34 can be provided at both ends of the sampling resistor.

In some embodiments, the processing unit 940 can directly use the system on chip (SOC, System on Chip) of the on-board equipment, or a separate processing chip or processor, as long as it can receive the voltage value in the form of a digital signal and perform subsequent on-boarding. The working current of the equipment can be calculated. In this embodiment, it is preferable to use the SOC of the on-board equipment as the processing unit 940. Under the condition of ensuring the computing ability, the subsequent control can be further realized. For example, in order to protect the vehicle battery, the processing unit 940 calculates and determines the on-board equipment. After detecting the working current of the vehicle, check the size between its working current and the rated current of the on-board equipment during normal operation. When the working current is greater than the rated current, you can turn off the power of the on-board equipment to prevent excessive consumption of the vehicle battery, especially When the vehicle is turned off, the rated current of the on-board equipment may only be more than ten milliamperes at this time. If the working current monitored in real time is 1A, the working current is much greater than the rated current, and the processing unit 940 needs to turn off the on-board equipment. The power supply prevents excessive consumption of the battery of the vehicle, so as not to accelerate the aging of the battery.

Further, in actual use, the conversion circuit 950 at least includes a direct current buck (DCDC, also known as high-voltage (low-voltage) direct current power conversion to low-voltage (high-voltage) direct current power supply), one end of the DC buck is connected to the vehicle The power supply is connected, and the other end is connected to the power supply 910 of the on-board equipment to convert the 12V voltage output by the vehicle battery into the 4.2V voltage of the rated input of the on-board equipment. For example, as shown in Figure 12, VIN is the output voltage of a 12V on-board battery, and the 12V voltage is converted through U5 to obtain a 4.2V VCC, which can be used as the power supply voltage for on-board equipment. It should be understood that the use of a DC step-down converter to convert between high voltage and low voltage is only a preferred embodiment proposed in this embodiment. In actual use, other devices or other forms of conversion circuits can be selected according to the actual situation, as long as It suffices that the conversion between high pressure and low pressure can be realized, which is not limited in this embodiment.

In the case that the conversion circuit 950 includes at least a DC step-down device, the processing unit 940 can issue a control command to control the DC step-down device to stop output when it monitors that the working current is greater than the rated current of the on-board device. The DCDC output mode protects the vehicle battery and prevents excessive consumption of the vehicle battery's power, so as to avoid accelerating the aging of the battery. In some embodiments, when the monitored operating current is greater than the rated current of the vehicle-mounted device, the vehicle battery can also be protected by turning off the power supply of the vehicle-mounted device. In some embodiments, multiple preset thresholds can be set to determine that the corresponding operation can be performed. For example, when the associated parameter is greater than the reference threshold, a cut-off operation can be performed. For another example, when the associated parameter exceeds the reference threshold and is within the first threshold, a reminder operation may be performed. For another example, when the associated parameter exceeds the second threshold and is within the first threshold, a power management operation may be performed. For details on how to determine the operation instruction information related to the in-vehicle device based on the associated parameters and the corresponding preset threshold, please refer to the description in FIG. 7 of this specification. To sum up, in some embodiments of the present application, a sampling resistor 920 is set between the power supply of the on-board equipment and the processing unit that actually implements the functions of the on-board equipment, and the voltage value across the sampling resistor 920 is measured in real time to work as the on-board equipment. The basis for determining the current allows the user to know the working status of the on-board equipment in time, and deal with it in time when the on-board equipment is in an abnormal working state to prevent the abnormal power consumption of the on-board equipment from causing loss to the vehicle battery.

In some embodiments, in order to facilitate vehicle users to monitor the working status of the vehicle equipment, in addition to the power supply 910, sampling resistor 920, acquisition unit 930, and processing unit 940 of the vehicle equipment, the monitoring device of the vehicle equipment may also be installed Display unit, communication unit, alarm unit and other functional units to achieve corresponding functions. Wherein, the display unit is used to display relevant information that needs to be displayed to the vehicle user, such as reminder information or warning information, etc., the communication unit is used to communicate with the vehicle user terminal 140, and the alarm unit is used for vehicle-mounted equipment Warning of abnormal working status. In some embodiments, if the processing unit detects that the current working current is greater than the rated current, it can be determined that the vehicle-mounted device is currently in an abnormal working state. At this time, the processing unit can turn off the power input, and at the same time display the corresponding alarm to the user on the display unit Information, through the alarm unit with sounds or flashing warning lights, reminds the user that the current on-board equipment is too large, which may affect the vehicle battery, and prompts the user to replace or repair the on-board equipment in time. In some embodiments, the manner of performing other functions through the display unit, the communication unit, and the alarm unit may be determined based on the comparison between the operating current of the vehicle-mounted device and the preset threshold. In some embodiments, when the user is not in a state of driving a vehicle, for example, after parking the vehicle in a parking space at night, the driving recorder installed on the vehicle is still in working state. At this time, the user is prompted through the display unit or the alarm unit. Since the user cannot obtain the alarm information in time when he is not in the car, the alarm information can be sent to the user's pre-set mobile terminal through the communication unit, so that the user can obtain the abnormal working status of the in-vehicle equipment in time even if he is not in the car. Timely replacement or maintenance of on-board equipment.

Some embodiments of the present application also provide a vehicle-mounted device, which can provide various types of equipment with extended functions, such as driving recorders, vehicle-mounted navigation, and vehicle alarm systems, that are installed on vehicles and provide more changes for vehicles and vehicle owners. Convenient driving function. The description mode of the in-vehicle device and the content of the priority manual is relatively close. It should be understood that the working state of on-board equipment mainly includes the following three types: normal working state, which is used to characterize the state in which the on-board equipment is working at the rated power when the vehicle is in normal use. At this time, the rated working current of the on-board equipment is usually 1A; The low power consumption state is used to ensure that the vehicle equipment is working with lower power consumption after the vehicle is turned off. At this time, the rated working current of the vehicle equipment may be only more than ten milliamperes; the abnormal working state is used to characterize the operation of the vehicle equipment The working state where the current is greater than the rated working current.

Existing on-board equipment usually needs to be connected to the vehicle’s on-board battery for power supply, and its power consumption during normal operation is mostly within 1 amp. When the vehicle is turned off, the normal on-board equipment will reduce its own power consumption, and most of them are controlled in Within 20 mA, if the on-board equipment is in an abnormal working state, it will continue to consume power at a power consumption of 1A after the vehicle is turned off. Taking a battery capacity of 50 Ah as an example, theoretically, the battery can be used up in about 50 hours , That is, the vehicle battery needs to be charged. If the above abnormal working conditions continue to occur, the loss of the vehicle battery will increase, which will speed up the battery aging speed and shorten the battery life.

Therefore, in the vehicle-mounted equipment in this embodiment, in addition to the components required to implement each function in the original equipment, at least the monitoring device provided in the first embodiment of this application is installed, that is, the power supply of the vehicle-mounted equipment and the actual implementation of the vehicle-mounted The sampling resistor set between the processing unit of the equipment function measures the voltage value at both ends of the sampling resistor in real time as the basis for determining the working current of the vehicle equipment, so that the user can know the working status of the vehicle equipment in time, and in time when the vehicle equipment is in an abnormal working state Deal with it to prevent the abnormal power consumption of on-board equipment from causing loss to the vehicle battery.

Specifically, in order to ensure the consistency of the data collected in different on-board equipment, the sampling resistor preferably uses a high-precision resistor with a resistance error of less than or equal to 1%, so that when the input voltage is consistent, the collected voltage The error with the final calculated operating current is also within 1%. In some embodiments, the sampling resistor may be a high-precision resistor with a resistance error of less than 5%, 4%, 3%, 2%, 1%, etc., for details, please refer to the description in FIG. 2 of this specification. Further, in order to ensure that the introduction of the sampling resistor will not increase the power consumption of the vehicle battery, a sampling resistor with a resistance value less than or equal to 1 ohm can be selected. In this embodiment, a high precision of 0.1 ohm or 0.056 ohm is preferred. Resistor, according to the power consumption calculation formula W=I ² *R, when the current flowing through the sampling resistor is 1A, the power consumption increase caused by this part of the circuit is 0.1W or 0.056W respectively, which is compared with the power of the whole car equipment The consumption is basically negligible. In some embodiments, the sampling resistor may be a resistance within a resistance range of 1 ohm, 0.1-0.5 ohm, 0.05-0.1 ohm, etc. For details, please refer to the description in Fig. 7 of this specification.

The acquisition unit is configured to collect the voltage across the sampling resistor in real time, its input terminal is connected to both ends of the sampling resistor, and the output terminal is connected to the processing unit for outputting the collected voltage value to the processing unit for further processing. In this embodiment, the acquisition unit may use an analog-to-digital converter to acquire the voltage value across the sampling resistor at a preset frequency during use, convert it from an analog signal to a digital signal, and output it to the processing unit for processing.

In some embodiments, the monitoring device of the vehicle-mounted equipment may further include a monitoring unit for detecting the heating temperature of the vehicle-mounted equipment. In some embodiments, the monitoring unit may directly set a temperature sensor to detect the heating temperature of the vehicle-mounted device. In some embodiments, a thermistor may be provided in the vehicle-mounted device, and its resistance may vary with temperature. The heating temperature of the vehicle-mounted device can be obtained by measuring changes in certain parameters of the thermistor, for example, the voltage change value, Resistance change value, etc. If the vehicle equipment is in abnormal working condition for a long time, the working current will be greater than the rated working current, which will gradually increase the temperature of the vehicle equipment. Therefore, the heating temperature of the vehicle equipment can reflect the working state of the vehicle equipment to a certain extent. In some embodiments, when the heating temperature detected by the temperature sensor reaches a certain preset value, related subsequent operations can be performed (similar to the case of monitoring the operating current of the vehicle-mounted device), for example, turning off the power of the vehicle-mounted device , Remind vehicle users and other operations.

The processing unit in this embodiment can directly use the SOC of the vehicle-mounted device, or use a separate processing chip or processor, as long as it can receive the voltage value in the form of a digital signal and perform subsequent calculation of the operating current of the vehicle-mounted device. In this embodiment, it is preferable to use the SOC of the on-board equipment as the processing unit. Under the condition of ensuring the computing power, the subsequent control can be further realized. For example, in order to realize the protection of the vehicle battery, the processing unit calculates and determines the work of the on-board equipment. After the current is applied, detect the size between its working current and the rated current of the vehicle equipment during normal operation. When the working current is greater than the rated current, you can turn off the power of the vehicle equipment to prevent excessive consumption of the vehicle battery, especially in the vehicle When the flame is turned off, the rated current of the on-board equipment may only be more than ten milliamperes at this time. If the real-time monitoring working current is 1A, the working current is much greater than the rated current, and the processing unit needs to turn off the power of the on-board equipment to prevent Excessive consumption of battery power in the vehicle will prevent the battery from accelerating aging.

Further, in actual use, the conversion circuit includes at least a direct current buck DCDC, one end of the DC buck is connected to the vehicle power supply, and the other end is connected to the power supply of the vehicle equipment to convert the 12V voltage output by the vehicle battery 4.2V rated input voltage for in-vehicle equipment. It should be understood that the use of a DC step-down converter to convert between high voltage and low voltage is only a preferred embodiment proposed in this embodiment. In actual use, other devices or other forms of conversion circuits can be selected according to the actual situation, as long as It suffices that the conversion between high pressure and low pressure can be realized, which is not limited in this embodiment. In the case where the conversion circuit includes at least a DC step-down converter, the processing unit can issue a control command to control the DC step-down converter to stop output when it detects that the working current is greater than the rated current of the on-board equipment, and then turn off the DCDC output. The way to protect the vehicle battery to prevent excessive consumption of the vehicle battery, so as not to cause the battery to accelerate aging.

In order to facilitate the real-time monitoring of the working status of the vehicle-mounted equipment, other functional units such as display unit, communication unit, and alarm unit can also be installed in the vehicle-mounted equipment. For example, when the vehicle-mounted equipment is equipped with a display unit, a communication unit, and an alarm unit, if the processing unit detects that the current working current is greater than the rated current, it can be determined that the vehicle-mounted equipment is currently in an abnormal working state. At this time, the processing unit can turn off the power input, and At the same time, the corresponding alarm information is shown to the user on the display unit, and the alarm unit reminds the user that the current on-board equipment is too large, which may affect the vehicle battery, and prompts the user to replace or repair the on-board equipment in time ; When the user is not in a state of driving a vehicle, for example, after parking the vehicle in a parking space at night, the driving recorder installed on the vehicle is still in working state. At this time, the user is notified through the display unit or the alarm unit, because the user is not in the car The alarm information cannot be obtained in time. At this time, the alarm information can be sent to the user's preset connection mobile terminal through the communication unit, so that the user can obtain the abnormal working status of the vehicle equipment in time even if the user is not in the vehicle, so as to realize the timely response to the vehicle equipment. Replace or repair.

The possible beneficial effects of the embodiments of the present application include but are not limited to: (1) According to the collected data of the vehicle battery voltage sampling after the vehicle is turned off for a period of time, the low-voltage protection value of the vehicle battery can be dynamically adjusted, so as to be able to adjust the low voltage protection value of the vehicle battery according to the Under different conditions, the low-voltage protection of the vehicle battery is adaptively performed; (2) The target protection voltage of the vehicle battery is dynamically updated over time, effectively preventing the continuous power consumption and low-voltage protection of the on-board electronic equipment caused by the low-voltage protection value. If the value is too high, some functions of on-board electronic equipment will be shut down prematurely, effectively prolonging the service life of the vehicle battery without affecting the functions of the on-board electronic equipment; (3) Building a circuit for voltage comparison based on simple electronic devices will be based on the vehicle The input voltage of the battery voltage is compared with the preset low-voltage protection value to achieve the effect of monitoring the voltage of the vehicle battery and realizing the low-voltage protection of the vehicle battery; (4) Use simple electronic devices to build, reduce the hardware cost, and improve the low-voltage protection of the vehicle battery The stability of the vehicle can effectively prevent the exhaustion of the vehicle battery caused by the continuous power consumption of the vehicle electronic equipment, avoid damage to the vehicle battery, and prolong the service life of the vehicle battery; (5) Monitor the vehicle equipment by monitoring the associated parameters of the vehicle equipment Working status, and then determine whether the working status is abnormal, and perform corresponding processing operations according to the abnormal situation of the working status, to protect the battery of the vehicle where the on-board equipment is located, and prevent the abnormal power consumption of the on-board equipment from causing loss to the vehicle battery; (6) Pass A sampling resistor is connected in series in the vehicle equipment to monitor the current of the vehicle equipment, and then determine the working status of the vehicle equipment, the monitoring scheme is simple, and the monitoring circuit is simple; (7) The abnormality of the vehicle equipment is automatically judged by setting different thresholds. In addition, corresponding reminder schemes or operation schemes are given for different levels of abnormalities, which can improve the user experience.

Claims

A low-voltage protection method for vehicle-mounted equipment, characterized in that the method includes:

Acquiring the target protection voltage of the vehicle battery at the current time, the vehicle battery provides power to one or more on-board devices after the vehicle is turned off, and the value of the target protection voltage is dynamically updated as time changes;

Comparing the target protection voltage with the real-time voltage of the vehicle battery;

Determine an operation instruction related to the one or more in-vehicle devices according to the comparison result.
The method of claim 1, wherein the obtaining the target protection voltage of the vehicle battery at the current time comprises:

Acquiring historical voltage data of the vehicle battery in a preset time interval before the current time;

The target protection voltage is determined according to the historical voltage data.
The method according to claim 2, wherein the preset time interval is 7 consecutive days before the current time.
3. The method according to claim 2, wherein said obtaining historical voltage data in a preset time interval before the current time comprises:

Collect the battery voltage value of the vehicle after the vehicle is turned off within the preset time interval at a preset sampling frequency.
The method of claim 4, wherein the preset sampling frequency is 1 time/minute.
The method of claim 2, wherein the determining the target protection voltage according to the historical voltage data comprises:

A weighted average of the historical voltage data is taken to determine the target protection voltage.
The method of claim 2, wherein the determining the target protection voltage according to the historical voltage data further comprises:

Sorting the historical voltage data and forming a data sequence;

Filtering out part of the historical voltage data at both ends of the data sequence;

The target protection voltage is determined according to the filtered data sequence.
8. The method according to claim 7, wherein the filtering out part of the historical voltage data at both ends of the data sequence comprises:

Filter out the historical voltage data of 5% at the head and 5% at the tail of the data sequence.
The method according to claim 2, wherein the method further comprises:

Obtain the initial protection voltage;

The target protection voltage is determined according to the initial protection voltage and the historical voltage data.
9. The method of claim 9, wherein the initial protection voltage ranges from 11.3V to 11.8V.
A low-voltage protection device for vehicle-mounted equipment, comprising a processor, wherein the processor is configured to execute the low-voltage protection method for vehicle-mounted equipment according to any one of claims 1 to 10.
A protection device for vehicle equipment, which is characterized by comprising a voltage input circuit, a voltage conversion circuit, a power supply circuit and a trigger circuit, wherein:

The voltage input circuit is connected to a vehicle battery;

The power supply circuit is connected to the on-board electronic equipment;

The voltage conversion circuit is arranged between the voltage input circuit and the power supply circuit;

The trigger circuit is arranged at both ends of the voltage conversion circuit in parallel, and when a trigger condition is met, the trigger circuit generates a corresponding control signal, wherein the trigger circuit includes a voltage comparison circuit for comparing the input of the voltage input circuit Voltage and preset threshold.
The device of claim 12, wherein:

The voltage comparison circuit is used for:

In response to the input voltage being less than the preset threshold, sending a first signal to the voltage conversion circuit;

The voltage conversion circuit is used for:

Based on the first signal, stop supplying power to the in-vehicle device.
The device of claim 12, wherein:

The voltage comparison circuit is used for:

In response to the input voltage being greater than or equal to the preset threshold, sending a second signal to the voltage conversion circuit;

The voltage conversion circuit is used for:

Based on the second signal, power is supplied to the in-vehicle electronic device through the power supply circuit.
The device according to claim 12, wherein the trigger circuit further comprises a conversion unit for converting the output signal of the voltage comparison circuit into an enable signal, and the input terminal of the voltage comparison circuit is connected to the enable signal. The output terminal of the voltage input circuit is connected, the output terminal of the voltage comparison circuit is connected with the input terminal of the conversion unit, and the output terminal of the conversion unit is connected with the voltage conversion circuit.
The device according to claim 12, wherein the conversion unit is a triode; the output terminal of the voltage comparison circuit is connected to the base of the triode; the collector of the triode is connected to the voltage conversion circuit ; The emitter of the transistor is grounded.
The device according to claim 12, wherein the voltage comparison circuit further comprises a comparator and at least one resistor connected to the comparator, and the preset threshold is adjusted by the resistor.
The apparatus according to claim 17, wherein the voltage conversion circuit comprises a DCDC device U900, and the DCDC device U900 has an enable terminal.
The device of claim 12, wherein the preset threshold value ranges from 11.1V to 11.5V.
The device of claim 12, wherein the output voltage range of the voltage conversion circuit is 4.2V-5V.
A method for monitoring vehicle-mounted equipment, characterized in that the method includes:

Acquiring associated parameters of the vehicle-mounted device, where the associated parameters can reflect the working state of the vehicle-mounted device;

Based on the associated parameters and the corresponding preset threshold, the operation instruction information related to the vehicle-mounted device is determined.
The method according to claim 21, wherein the associated parameters of the vehicle-mounted device include the operating current of the vehicle-mounted device and/or the heating temperature of the vehicle-mounted device.
The method according to claim 22, wherein when the associated parameter of the vehicle-mounted device includes the operating current of the vehicle-mounted device, obtaining the associated parameter of the vehicle-mounted device comprises:

Obtaining the voltage across the resistor connected in series with the vehicle-mounted device;

Based on the resistance value of the resistor and the voltage across the resistor, a corresponding current is determined, and the current can reflect the operating current flowing through the vehicle-mounted device.
The method according to claim 23, wherein the error of the resistance is less than or equal to 1%.
The method of claim 23, wherein the resistance of the resistor is less than or equal to 1 ohm.
The method according to claim 22, wherein when the associated parameter of the vehicle-mounted device includes the heating temperature of the vehicle-mounted device, obtaining the associated parameter of the vehicle-mounted device comprises:

The temperature sensor detects the heating temperature of the on-board equipment.
The method according to claim 21, wherein the preset threshold value comprises a reference threshold value;

When the associated parameter is greater than the reference threshold, it is determined that the operation instruction information is a cut-off operation instruction; wherein the cut-off operation includes cutting off the power transmission between the vehicle battery and the on-board equipment.
The method according to claim 21, wherein the preset threshold value further comprises a reference threshold value and a first threshold value, and the first threshold value is greater than the reference threshold value;

When the associated parameter exceeds the reference threshold and is within the first threshold, determining that the operation instruction information is a reminder operation instruction;

When the associated parameter exceeds the first threshold, it is determined that the operation instruction information is a cut-off operation instruction.
The method according to claim 21, wherein the preset threshold value further comprises a reference threshold value, a first threshold value, and a second threshold value, and the second threshold value is greater than the reference threshold value and smaller than the first threshold value;

When the associated parameter exceeds the reference threshold and is within the second threshold, determining that the operation instruction information is a reminder operation instruction;

When the associated parameter exceeds the second threshold and is within the first threshold, determining that the operation instruction information is a power management operation instruction;

When the associated parameter exceeds the first threshold, it is determined that the operation instruction information is a cut-off operation instruction.
A monitoring device for vehicle-mounted equipment, comprising a processor, wherein the processor is configured to execute the monitoring method for vehicle-mounted equipment according to any one of claims 21 to 29.