TW201934976A - On-vehicle apparatus for detecting output voltage variation - Google Patents

Abstract

An on-vehicle apparatus for detecting output voltage variation connected to a battery and a power generator of a vehicle, and the on-vehicle apparatus receives power from the battery via a power wire. A control device of the on-vehicle apparatus detects the output voltage variation of the battery by a voltage detection module, so as to determine whether an engine of the vehicle is activated. When the engine is not activated for a predetermined wait time period, the control device enables an accelerator to detect abnormal vibration. When abnormal vibration occurs, the abnormal vibration and positioning information obtained from a satellite positioning module is sent to a vehicle cloud server by a mobile communication module. Furthermore, when the battery is in a low battery status, the control device switches power source to a spare battery module and turns into a sleep mode to reduce power consumption.

Description

Vehicle-mounted device with battery voltage change detection function

The invention relates to a vehicle-mounted device, in particular to a vehicle-mounted device with a battery voltage change detection function, which can be used to obtain whether the engine of the vehicle is started, switch the anti-theft mechanism, and monitor the battery state of the vehicle.

In general, in-vehicle devices need to be wired into the vehicle's circuit system in order to know whether the engine of the vehicle is turned on to capture signals related to the operation of the engine. After you determine whether the engine is turned off or on, you can decide which of the various functions need to be started. For example, the anti-theft mechanism needs to be automatically started after the engine is turned off (that is, the vehicle has finished parking); for example, the driving camera system must be started after the engine is turned on, and also turned off after the engine is turned off.

However, the connection method of capturing signals related to the operation of the engine increases the difficulty of wiring. After the on-vehicle device is expanded, the electrical connection lines are more complicated, which makes the number of external ports of the on-vehicle device increase greatly, which is prone to the problem of water ingress.

In view of the above problems, the present invention provides a vehicle-mounted device with a battery voltage change detection function, which can simplify the wiring required for the vehicle-mounted device and detect whether the engine is started or not.

The invention proposes a vehicle-mounted device with a battery voltage change detection function, which is installed in a vehicle and connected to a battery and a generator of the vehicle. The generator is driven by an engine of the vehicle, and the generator has an AC-to-DC rectifier circuit for providing a charging current to the battery. The vehicle-mounted device obtains power from a battery through a power line, and includes a control host, an acceleration gauge, a voltage change detection module, a satellite positioning module, a mobile network communication module, and a backup battery module.

The accelerometer is electrically connected to the control host, detects an abnormal vibration of the vehicle, and transmits an abnormal vibration signal to the control host, so that the control host generates an abnormal warning. The voltage change detection module is electrically connected to the control host, and captures the output voltage of the battery through the power line for the control host to determine whether the engine is started. The satellite positioning module is electrically connected to the control host, receives a satellite positioning signal for positioning to generate positioning information, and transmits the positioning information to the control host. The mobile network communication module is electrically connected to the control host, connected to an Internet through a mobile communication network, and establishes a communication link with a vehicle cloud host through the Internet, and the control host transmits through the mobile network communication module. The abnormal warning and positioning information are transmitted to the vehicle cloud host, and the mobile network communication module provides auxiliary positioning information when the satellite positioning module cannot generate positioning information. The backup battery module is electrically connected to the control host to provide a backup power to the vehicle-mounted device.

When the engine is off and the output voltage of the battery is lower than a low battery warning value, the control host cuts off the battery power supply and switches the power input of the vehicle-mounted device to a backup battery module.

Among them, when the voltage change detection module judges that the engine is turned off by detecting the output voltage of the battery, the control host further determines whether the engine shutdown state continues for a predetermined waiting time; after the engine shutdown reaches the predetermined waiting time, the control host enables acceleration To monitor vehicles for abnormal vibrations.

By detecting the battery output voltage of the vehicle and judging the engine starting status, the invention automatically switches the anti-theft warning mechanism, so that the connection between the on-vehicle device and the vehicle can be greatly simplified without changing the original wiring of the vehicle. At the same time, by detecting the output voltage of the battery, it can also prevent the vehicle-mounted device from consuming the battery power improperly.

Please refer to FIG. 1, which is a vehicle-mounted device 100 having a battery voltage change detection function according to a first embodiment of the present invention, which is disposed in a vehicle and is electrically connected to a battery 210 and a generator 220 of the vehicle. .

As shown in FIG. 1, the generator 220 is driven by an engine 230 of the vehicle, and the generator 220 has an AC-to-DC rectifier circuit (not shown) for providing a charging current to the battery 210. The aforementioned AC to DC rectifier circuit is a necessary line in the generator 220, and the output charging current will have ripples due to AC and DC conversion characteristics. The details of the AC and DC conversion are common knowledge, and will not be shown here and further detailed. Described.

As shown in FIG. 1, the vehicle-mounted device 100 obtains power required for operation from the battery 210 through a power line 102. Since the output of the generator 220 is connected in parallel to the battery 210, by detecting the output voltage change of the battery 210, in addition to determining the health status of the battery 210, it can also determine whether the engine 230 is started or not, thereby determining the anti-theft mechanism Which mode is activated and reports anti-theft messages. The health status of the battery 210 and whether the engine 230 is started can also be used as trigger conditions or decision conditions for other monitoring mechanisms. The in-vehicle device 100 and the battery 210 and the generator 220 only need to be connected by the power line 102 and the ground line, and no complicated wiring is required.

As shown in FIG. 1, the vehicle-mounted device 100 of the first embodiment includes at least a control host 110, an accelerometer 120 (G Sensor, Accelerometer), a voltage change detection module 130, a satellite positioning module 140, and a mobile device. The network communication module 150 and a backup battery module 160. The aforementioned components may be disposed in a waterproof case 170, leaving only necessary electrical connection wires or connector terminals exposed on the surface of the waterproof case 170, so that the vehicle-mounted device 100 has a waterproof function, and forms a single device for easy disassembly.

As shown in FIG. 1, the in-vehicle device 100 is electrically connected to the storage battery 210 through the power line 102, so that the storage battery 210 obtains power required for operation, and monitors the voltage change at the output end of the storage battery 210. Among them, the control host 110 can be electrically connected to the battery 210 to receive power through the power line 102 and then to distribute power to other components through the electrical connection relationship. The power of the battery 210 can also pass through the power chip after the power line 102 extends into the vehicle-mounted device 100 (Not shown) branched to different components, and the detection pins of the voltage change detection module 130 can be directly electrically connected to the power line 102 instead of wiring to the battery 210; power is transmitted through the transmission wiring inside the vehicle-mounted device 100 It can be changed according to the requirements, which will not be described in detail below. The control host 110 has a data processing unit such as a CPU or a microprocessor, and is configured to respond according to the received signal, and output a corresponding signal to provide a necessary detection result or perform a control operation.

As shown in FIG. 1, the acceleration gauge 120 is electrically connected to the control host 110 to detect abnormal vibration of the vehicle, and transmits a corresponding abnormal vibration signal to the control host 110 so that the control host 110 can be triggered by the abnormal vibration signal to generate an abnormality. Caution. The output of the acceleration gauge 120 is usually an acceleration value, and when the acceleration value exceeds an acceleration threshold, the control host 110 may be triggered to recognize the output of the acceleration value as an abnormal vibration signal. Alternatively, a simple discrimination circuit may be provided in the acceleration gauge 120, and when the detected acceleration value exceeds the aforementioned acceleration threshold value, an electric signal marked as an abnormal vibration signal is sent to the control host 110. In actual configuration, the accelerometer 120 may be integrated in the control host 110 instead of being independently set. For example, an acceleration or an additional circuit is soldered on the circuit board of the control host 110, and when the control host 110 enters a sleep mode to save power, Independently continuously detects abnormal vibrations and wakes up the control host 110 with the abnormal vibration signals.

As mentioned above, the acceleration gauge 120 is used to detect acceleration and express the aforementioned vibration with the acceleration value, so as to use the acceleration value to determine whether the vehicle has a dynamic that does not belong to stationary parking (the acceleration value exceeds the acceleration threshold), that is, the vehicle has an abnormal vibration , Such as a vehicle moving or being moved, a door being opened, a person entering or exiting the cabin, a collision of the vehicle, etc. The control host 110 can be used to enable or disable the acceleration rule 120, so that the acceleration rule 120 will trigger the control host 110 with an abnormal vibration signal only when needed. The enabling or disabling of the accelerometer 120 by the control host 110 may not necessarily turn off the accelerometer 120. It may also be that the control host 110 temporarily closes the connection port or ignores the control host 110, so that the signal sent by the accelerometer 120 will not be responded by the control host 110. The acceleration gauge 120 may also continuously capture the acceleration value and send it to the control host 110 for the control host 110 to determine whether an abnormal vibration occurs according to the acceleration threshold. The acceleration signal at this time may also be regarded as an abnormal vibration signal.

As shown in FIG. 1, the voltage change detection module 130 is electrically connected to the control host 110 and captures the output voltage of the battery 210 through the power line 102. The voltage change detection module 130 monitors a change in the output voltage for the control host 110 to determine whether the engine 230 is started. The voltage change detection module 130 usually sends a corresponding trigger condition signal under a specific voltage change state, so that the control host 110 determines that the engine 230 is started, and triggers the control host 110 to perform a corresponding operation, or the trigger condition signal may be used to put the computer in sleep. Control host 110 wakes up.

The aforementioned specific voltage change state mainly analyzes whether the output voltage of the battery 210 is affected by the charging current output by the generator 220. The voltage of the charging current output by the generator 220 is usually higher than the normal output voltage of the battery 210, or it will cause the output voltage With ripples, it can be used to make the control host 110 determine whether the engine 230 is started. Similarly, the voltage change detection module 130 can also be configured on the circuit board of the control host 110 in the form of a local circuit, instead of necessarily being an independently configured module.

As shown in FIG. 1, the satellite positioning module 140 is electrically connected to the control host 110. The satellite positioning module 140 receives a satellite positioning signal (such as a satellite signal from a GPS system), performs positioning based on it to generate positioning information (positioning coordinates, altitude, etc.), and transmits the positioning information to the control host 110. The satellite positioning signal will also carry a satellite time stamp, which can be transmitted to the control host 110 for time correction.

As shown in FIG. 1 and FIG. 2, the mobile network communication module 150 is electrically connected to the control host 110 for connecting to an Internet through a mobile communication network, so that the vehicle-mounted device 100 communicates with a vehicle through the Internet. The cloud host 300 establishes a communication link. The mobile network communication module 150 may be, but is not limited to, a global system for mobile communication (Global System for Mobile Communication, GSM Communication) protocol standard. The control host 110 may periodically or immediately transmit the abnormal warning and positioning information to the vehicle cloud host 300 through the mobile network communication module 150 to notify the vehicle cloud host 300 of the occurrence of the abnormal warning and the position of the vehicle-mounted device 100 (location information, that is, the vehicle's position). In addition, since the access point of the mobile communication network, that is, the base station, will also provide the location-related information of the access point itself (usually latitude and longitude coordinates) when connecting with the mobile network communication module 150, Since auxiliary positioning can be performed, the mobile network communication module 150 can provide auxiliary positioning information to the control host 110 when the satellite positioning module 140 cannot generate positioning information (for example, malfunction or temporarily cannot receive satellite positioning signals).

The positioning information generated by the satellite positioning module 140 is periodically, irregularly or instantly transmitted to the vehicle cloud host 300 through the mobile network communication module 150, so that the vehicle cloud host 300 can monitor the location of the vehicle and pass it when an abnormal warning occurs on the vehicle. The means of communication informs specific objects.

The satellite positioning module 140 can also download ephemeris data through the mobile network communication module 150. When the satellite positioning signal is not received well, the current positioning information is estimated from the ephemeris data.

As shown in FIG. 1, the backup battery module 160 is electrically connected to the control host 110 to provide backup power to the vehicle-mounted device 100. The voltage change detection module 130 continuously monitors the output voltage of the battery 210. When the engine 230 is turned off and the output voltage of the battery 210 is lower than a low battery warning value, the control host 110 cuts off the power of the battery 210 and switches the vehicle device 100 on. The power input is switched to the backup battery module 160, so as to prevent the vehicle-mounted device 100 from continuously consuming the power of the battery 210 when the generator 220 cannot charge the battery 210, resulting in a state in which subsequent vehicles cannot start normally.

As shown in FIG. 1 and FIG. 3, when the voltage change detection module 130 determines that the engine 230 is turned off by detecting the output voltage of the battery 210, the control host 110 further determines whether the shutdown state of the engine 230 continues for a predetermined waiting time, such as Steps 110 and 120 are shown. After the duration that the engine 230 is turned off reaches a predetermined waiting time, the control host 110 determines that the vehicle is in a stopped state with the engine 230 turned off. At this time, the control host 110 enables the acceleration gauge 120 to monitor whether the vehicle has abnormal vibration, as shown in step 130.

As shown in Figures 1, 2 and 3, when the accelerometer 120 detects an abnormal vibration that is not in the parking state, the accelerometer 120 sends an abnormal vibration signal to trigger the control host 110 to generate an abnormal alert, as in step 140. , As shown in Step 150. The control host 110 transmits the abnormality warning and the positioning information obtained by the satellite positioning module 140 to the vehicle cloud host 300 through the mobile communication network, as shown in step 160. The vehicle cloud host 300 may further process the abnormality alert, for example, using a communication means to notify the owner of the vehicle or notify the security personnel to go to check based on the positioning information. The so-called communication means may be that the vehicle owner or security personnel holds a mobile communication device (smartphone, tablet computer) and installs communication software, and the vehicle cloud host 300 pushes an abnormal alert to the designated mobile communication according to a preset notification object Device.

As shown in FIG. 4, the voltage change detection module 130 analyzes the ripple of the output voltage and the magnitude of the output voltage to determine whether the generator 220 is being driven by the engine 230 and outputs a charging current to charge the battery 210. The original output of the generator 220 is AC power. After full-wave conversion from AC to DC, it becomes DC with ripple. The continuous high peak of the ripple can be used as a ripple trigger signal to determine that the engine 230 drives the output of the generator 220 for starting.

In other words, the voltage change detection module 130 can determine whether a continuous high peak of the ripple exists, and send a ripple trigger signal to the control host 110 to determine whether the engine 230 is started. If the control host 110 receives a ripple trigger signal, the engine 230 is started, and the acceleration accelerator 120 is disabled from performing abnormal vibration detection. However, the control host 110 does not determine that the engine 230 is shut down based on the state that the ripple trigger signal does not exist, and other conditions must be met. In order to avoid misjudgment, a surge voltage value can be set, and the voltage higher than the surge voltage value is filtered as noise to avoid misjudgment as one of the continuous high peaks of the ripple.

As shown in FIG. 5, the capacitance and inductance effects of the battery 210 or other parts of the circuit may filter the ripples and make the ripples inconspicuous. Since the voltage of the charging current charged by the generator 220 to the battery 210 will increase the average output voltage of the battery 210, it can also be used to determine whether the engine 230 is started. Therefore, the voltage change detection module 130 can also set a high voltage threshold VH to the output voltage of the battery 210, and when the output voltage is higher than the high voltage threshold VH, output a high voltage trigger signal to the control host 110, so that the control host 110 determines that the engine 230 is started. That is, when either a ripple trigger signal or a high-voltage trigger signal is present, the control host 110 determines that the engine 230 is started, and the disabled acceleration gauge 120 does not perform abnormal vibration detection.

As shown in FIG. 5, on the contrary, when the engine 230 is turned off, the generator 220 does not output the charging current, so there is no ripple in the output voltage of the battery 210, so that the voltage change detection module 130 determines that the ripple trigger signal is not presence. Because the ripple may also be absorbed by the battery 210 or the circuit, a low voltage threshold VL is set in the voltage change detection module 130. When the output voltage of the battery 210 is less than the low voltage threshold VL, the voltage change detection module 130 outputs A low-voltage trigger signal is transmitted to the control host. The control host 110 determines that the engine 230 is turned off when the ripple trigger signal does not exist and the low-voltage trigger signal exists.

In addition to the foregoing methods, the voltage change detection module 130 may also continuously monitor the change in the output voltage, and use the voltage drop range as a trigger condition.

As shown in FIG. 5, when the engine 230 is turned off, that is, when the generator 220 stops outputting, the battery 210 will recover from being charged to an uncharged state (the output voltage is lower than the low voltage threshold VL). At this time, the output voltage will be larger. DV. Therefore, the voltage change detection module 130 may set a first voltage drop threshold dV1, and send a first voltage drop trigger signal to the control host 110 when the voltage drop dV of the battery 210 voltage is greater than a first voltage drop threshold dV1. The voltage drop dV may also be caused by other vehicle motors being turned on suddenly. Therefore, the control host 110 determines that the engine 230 is turned off when the first voltage drop trigger signal is present and the ripple trigger signal is not present.

After determining that the engine 230 is turned off, in order to prevent the power of the battery 210 from being continuously consumed by the on-vehicle device 100, the voltage change detection module 130 may set a safe voltage value. When the output voltage of the battery 210 exceeds the safe voltage value, the voltage change detection module 130 does not switch, so that the in-vehicle device 100 operates normally and is detected by the acceleration gauge 120, and is issued when abnormal vibration of the vehicle is detected Anomaly alerts and location information.

If the engine 230 is off and the output voltage of the battery 210 is lower than the safe voltage value, the control host 110 switches the power of the vehicle-mounted device 100 to use the backup battery module 160, and the control host 110 switches to the sleep state, and only the acceleration regulation is retained. 120 continuously detects the vibration of the vehicle, and uses the abnormal vibration signal as a wake-up condition to wake up the control host 110. After the accelerometer 120 detects an abnormal vibration and generates an abnormal vibration signal, the abnormal vibration signal can wake up the control host 110 of the in-vehicle device 100, so that the control host 110 sends a transmission abnormal warning and a satellite positioning module through the mobile network communication module 150. The positioning information obtained by the group 140 is sent to the vehicle cloud host 300, so that the vehicle cloud host 300 can further process the abnormality alert, such as using a communication means to notify the owner or notify the security personnel to go to check based on the positioning information. With the hibernation state, the consumption of the backup battery module 160 can be reduced to extend the usage time of the backup battery module 160.

In addition, in addition to abnormal vibrations, the voltage drop dV of the output voltage of the battery 210 caused by the sudden power consumption of the motor of the car can also be used to generate a warning that is considered abnormal, as one of the anti-theft mechanisms.

As shown in FIG. 5, in an embodiment, after the engine 230 is turned off, the voltage change detection module 130 continues to detect the output voltage of the battery 210, and the voltage drop dV of the battery 210 voltage is greater than a second voltage drop threshold At dV2, a second voltage drop trigger signal is sent to the control host 110. If the engine 230 is turned off and a second voltage drop trigger signal occurs, it means that some electric devices of the automobile motor are suddenly turned on, for example, the roof light triggered by the door opening is on. If the second voltage drop trigger signal occurs and the engine 230 does not start after a preset start time, the vehicle may be invaded by a non-owner for theft. At this time, the control host 110 issues an abnormal warning through the mobile network communication module 150. And the positioning information obtained by the satellite positioning module 140 to the vehicle cloud host 300. Similarly, if the in-vehicle device 100 is in a sleep state, the voltage change detection module 130 may wake up the control host 110 when the engine 230 is turned off and a second voltage drop trigger signal occurs, and then perform abnormal alarm and positioning information sending operations.

As shown in FIG. 5, a vehicle-mounted device 100 with a battery voltage change detection function disclosed in the second embodiment of the present invention further includes a local network module 180 and / or a digital video recording module 190. The connection relationship between the control host 110, the voltage change detection module 130, the battery 210, the generator 220, and the engine 230 is substantially the same as that in FIG. 1, and is not shown again here.

As shown in FIG. 6, the local area network module 180 is electrically connected to the control host 110. The local area network module 180 is used to provide a universal connector interface and a network communication protocol to facilitate the expansion of the port of the vehicle-mounted device 100. And the connection between the expansion component and the control host 110 is set by the address designation method. The connection between the control host 110 and other components in the in-vehicle device 100 can also be electrically connected indirectly through the local network module 180, thereby simplifying the wiring, that is, the pins of the control host 110 only need to be sufficiently connected to the power cord. 102. The ground wire and the local network module 180 are sufficient.

For example, in a specific embodiment, the local area network module 180 is an RS-485 communication network interface for establishing an RS-485 communication network. Vehicle-attached devices, such as vehicle diagnostic systems (On-Board Diagnostics, OBD), can be electrically connected to the control host 110 through the RS-485 communication network, and quickly set up and establish vehicle diagnostic systems and controls by address assignment The connection between the hosts 110. The control host 110 obtains tire pressure, vehicle speed, engine 230 speed, and other data through the vehicle diagnostic system, stores them, or transmits them to the vehicle cloud host 300 through the mobile network communication module 150. To establish a connection between the control host 110 and these expansion devices, it is only necessary to set an address, instead of setting the pin connection relationship between the control host 110 and these devices one by one.

For example, in another specific embodiment, a commercial vehicle is equipped with a number of equipment to assist in the transportation of goods, such as refrigeration equipment; the control circuit of the refrigeration equipment is electrically connected to the control host 110 through the RS-485 communication network, so that the control host 110 passes the RS- The 485 communication network obtains the operating parameters such as the temperature of the refrigeration equipment, and stores them or transmits them to the vehicle cloud host 300 through the mobile network communication module 150, or issues a control command to the control circuit of the refrigeration equipment; the number of I / O is insufficient In the case of RS-485 communication network interface, I / O can also be expanded through DIO and AIO expansion modules.

As shown in Figure 5, a digital video recording module 190 (DVR, Digital Video Recorder) is mainly used to connect video cameras, such as driving video cameras, reversing cameras, panoramic video cameras, etc., to continuously receive video signals and store them as video data. files. The digital recording module 190 can also be electrically connected to the control host 110 and controlled by the control host 110, so that the control host 110 can control the digital recording module 190. The image data file can be transmitted to a remote image cloud host 400 via the mobile network communication module 150 for storage. Information in the in-vehicle device 100, such as positioning information obtained by the satellite positioning module 140 and abnormal alarms generated by the control host 110, can also be transmitted to the digital recording module 190 through the control host 110 to use the foregoing information to mark the image data file , And can quickly find the image data file fragment corresponding to the abnormal alert, or the positioning information (photographing location) corresponding to the image data file fragment. When the diagnostic mechanism of the digital recording module 190 finds a fault, for example, a video lost message occurs due to an image lens failure or a hard disk failure message generated by a hard disk failure, the control host 110 can send a fault notification to the vehicle cloud host 300 to report maintenance.

In a specific embodiment, the mobile network communication module 150 has two ports, such as a UART port and a USB port; the control host 110 is electrically connected to the mobile network communication module 150 through the UART port, and digital recording The module 190 is electrically connected to the mobile network communication module 150 through a USB port. Through the control of the control host 110, the digital recording module 190 can establish a communication link with the mobile network communication module 150 by itself via a USB port, and transmit the image data file to a remote image cloud host 400 without using The control host 110 relays the image data to prevent the transmission of the image data file from affecting the communication bandwidth of the control host 110.

In addition, when the engine 230 is turned off, the control host 110 may control the digital recording module 190 to be turned off to save power. When an abnormal alarm is generated, the control host 110 activates the digital recording module 190 to output the image data file with the abnormal alarm and positioning information, and the image data file at this time can be uploaded to the image cloud host 400 in real time. The vehicle owner or security personnel can connect to the image cloud host 400 through the mobile communication device, and obtain the image stream through the image cloud host 400 to instantly view the image captured by the image lens.

The vehicle owner or security personnel can also connect to the vehicle cloud host 300 through a mobile communication device to order the control host 110 and start the digital recording module 190, and obtain the image stream through the image cloud host 400 and the image cloud host 400. Watch the images captured by the image lens in real time, or capture the image data files stored in the hard disk of the digital recording module 190.

By detecting the output voltage of the battery 210 of the vehicle, the present invention determines the starting state of the engine 230, and automatically switches the anti-theft warning mechanism, so that the connection between the vehicle-mounted device 100 and the vehicle can be greatly simplified without changing the original wiring of the vehicle. At the same time, the output voltage detection of the battery 210 can also prevent the vehicle-mounted device 100 from improperly consuming the power of the battery 210.

100‧‧‧ vehicle device

102‧‧‧Power cord

110‧‧‧Control Host

120‧‧‧Accelerator

130‧‧‧Voltage Change Detection Module

140‧‧‧Satellite positioning module

150‧‧‧Mobile Network Communication Module

160‧‧‧Backup battery module

170‧‧‧Waterproof case

180‧‧‧ LAN Module

190‧‧‧digital image module

210‧‧‧ Battery

220‧‧‧ Generator

230‧‧‧ Engine

300‧‧‧vehicle cloud host

400‧‧‧Image Cloud Host

Step‧‧‧110 ~ Step

160‧‧‧step

V‧‧‧Output voltage

VH‧‧‧High voltage threshold

VL‧‧‧Low voltage threshold

dV‧‧‧Pressure drop

dV1‧‧‧First pressure drop threshold

dV2‧‧‧Second pressure drop threshold

[FIG. 1] A circuit block diagram of a first embodiment of the present invention. FIG. 2 is another circuit block diagram of the first embodiment of the present invention. [FIG. 3] A flowchart of enabling an accelerometer to perform abnormal vibration in the first embodiment of the present invention. 4 is a schematic diagram of continuous high peaks of ripples in the first embodiment of the present invention. 5 is a schematic diagram of a judgment condition of a battery output voltage in the first embodiment of the present invention. 6 is a circuit block diagram of a second embodiment of the present invention.

Claims (10)

An on-vehicle device with a battery voltage change detection function is provided in a vehicle and is connected to a battery and a generator of the vehicle. The generator is driven by an engine of the vehicle and the generator has an alternating current converter. A DC rectifier circuit is used to provide a charging current to the battery; the vehicle-mounted device obtains power from the battery through a power line and includes: a control host; an acceleration gauge electrically connected to the control host to detect the vehicle An abnormal vibration, and an abnormal vibration signal is transmitted to the control host, so that the control host generates an abnormal warning; a voltage change detection module is electrically connected to the control host, and the battery is captured through the power cord An output voltage for the control host to determine whether the engine is started; a satellite positioning module electrically connected to the control host, receiving a satellite positioning signal for positioning to generate a positioning information, and transmitting to the control host; A mobile network communication module electrically connected to the control host and connected to an Internet through a mobile communication network And establish a communication link with a vehicle cloud host through the Internet, and the control host sends the abnormality alert and the positioning information to the vehicle cloud host through the mobile network communication module, and the mobile network communication module Providing auxiliary positioning information when the satellite positioning module cannot generate the positioning information; and a backup battery module electrically connected to the control host to provide a backup power to the vehicle-mounted device; wherein when the engine is turned off State and the output voltage of the battery is lower than a low battery warning value, the control host cuts off the battery power supply and switches the power input of the vehicle-mounted device to the backup battery module; wherein when the voltage change detection mode When the group judges that the engine is off by detecting the output voltage of the battery, the control host further judges whether the engine off state continues for a predetermined waiting time; after the engine is off for the predetermined waiting time, the control host enables the acceleration rule To monitor the vehicle for this abnormal vibration. The on-vehicle device with a battery voltage change detection function according to claim 1, wherein the voltage change detection module sets a high voltage threshold, and outputs a high voltage trigger signal when the output voltage is higher than the high voltage threshold. It is transmitted to the control host, so that the control host judges that the engine is started, and the acceleration gauge is disabled from performing the abnormal vibration detection. The on-vehicle device with a battery voltage change detection function according to claim 1, wherein the voltage change detection module transmits a continuous high peak value of a ripple of an output voltage of the battery as a ripple trigger signal to the control. The host for the control host to judge that the engine is started, and the acceleration gauge is disabled to perform the abnormal vibration detection. The on-vehicle device with a battery voltage change detection function according to claim 3 further includes a surge voltage value, and the voltage change detection module filters a voltage higher than the surge voltage value as noise. The on-vehicle device with a battery voltage change detection function according to claim 3, wherein the voltage change detection module sets a low voltage threshold value, and outputs a low voltage trigger signal when the output voltage of the battery is less than the low voltage threshold value. Transmitted to the control host, and the control host judges that the engine is shut down when the ripple trigger signal does not exist and the low voltage trigger signal exists. The on-vehicle device with a battery voltage change detection function according to claim 3, wherein the voltage change detection module sets a first voltage drop threshold value, and a voltage drop of an output voltage of the battery is greater than the first voltage drop When the threshold value is reached, a first voltage drop trigger signal is sent to the control host. The control host judges that the engine is turned off when the first voltage drop trigger signal exists and the ripple trigger signal does not exist. The vehicle-mounted device with a battery voltage change detection function according to claim 1, wherein when the output voltage of the battery is lower than a safe voltage value, the control host switches the vehicle-mounted device to use the power of the backup battery module, And the control host enters the dormant state, and the vibration of the vehicle is continuously detected only by the acceleration gauge, and the abnormal vibration signal can wake the control host. The on-vehicle device with a battery voltage change detection function according to claim 1, wherein after the engine is turned off, the voltage change detection module issues when the voltage drop of the battery output voltage is greater than a second voltage drop threshold A second voltage drop trigger signal is sent to the control host, and the control host sends the abnormal warning and the positioning information to the vehicle cloud host through the mobile network communication module when the engine has not started after a preset start time. The on-vehicle device with a battery voltage change detection function as described in claim 1, further includes a local area network module to provide a universal connector interface and network communication protocol to facilitate the expansion of the port of the on-vehicle device, and The address designation method sets the connection with the control host. The on-vehicle device with a battery voltage change detection function according to claim 1, further includes a digital recording module for receiving an image signal and storing it as an image data file, and the image data file can communicate through the mobile network. The module is sent to a remote image cloud host for storage.