CN114738158B - Engine start detection method, and vehicle networking terminal power supply control method and system - Google Patents
Engine start detection method, and vehicle networking terminal power supply control method and system Download PDFInfo
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- CN114738158B CN114738158B CN202210426754.8A CN202210426754A CN114738158B CN 114738158 B CN114738158 B CN 114738158B CN 202210426754 A CN202210426754 A CN 202210426754A CN 114738158 B CN114738158 B CN 114738158B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0848—Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention discloses an engine starting detection method, a vehicle networking terminal power supply control method and a system, wherein first data and second data are acquired; vector processing is carried out on the first data, and calculation is carried out on the processed data to obtain third data; performing calculation analysis on the second data to obtain fourth data; performing data fusion on the third data and the fourth data to obtain fifth data; judging whether the fifth data is larger than a first threshold value, if so, enabling an engine of the vehicle to be detected to be in a starting state; the control module is used for receiving the voltage signal, processing the voltage signal and controlling the switching power supply module according to the detection result; the invention has the beneficial effects that the power consumption of the power supply of each circuit is controlled to be the lowest power consumption by controlling the switch power supply module, so that the power consumption of the whole power supply management system is less than thirty milliwatts, the occurrence of the phenomenon that the vehicle-mounted storage battery is damaged due to over-discharge is prevented, and the service life of the vehicle-mounted storage battery is prolonged.
Description
Technical Field
The invention relates to the technical field of Internet of vehicles, in particular to an engine starting detection method, an Internet of vehicles terminal power supply control method and an Internet of vehicles terminal power supply control system.
Background
In the motorcycle on the market at present, the power supply of the motorcycle mainly comes from a self-contained generator and a vehicle-mounted storage battery, when the motorcycle engine does not work, all electronic equipment arranged on the motorcycle consumes energy from the vehicle-mounted storage battery, but the capacity of the vehicle-mounted storage battery of the motorcycle is 6-12Ah, most of lead-acid batteries, the capacity is much smaller than that of the storage battery of a passenger car, the actual capacity is greatly influenced by temperature, the vehicle-mounted storage battery has no overdischarge protection measures, and the damage is easily caused by the excessive consumption of electronic equipment.
At present, the commercial motorcycle networking terminal equipment is directly migrated to a motorcycle use scene by the passenger car networking terminal equipment, so that the power consumption is higher than 30mW in the non-working state of a motorcycle engine, after the motorcycle networking terminal equipment is applied to the field of motorcycles, the problem of overdischarge damage of more vehicle-mounted storage batteries occurs, and certain damage is caused to the vehicle-mounted storage batteries when serious, so that the service life of the vehicle-mounted storage batteries is reduced.
In view of this, the present application is specifically proposed.
Disclosure of Invention
The invention aims to solve the technical problems of over-discharge damage of a vehicle-mounted storage battery caused by higher power consumption of an engine in a non-working state of a motorcycle in the prior art, and provides an engine starting detection method, a vehicle networking terminal power supply control method and a vehicle networking terminal power supply control system, which can control the power consumption of the engine to be kept in a lower state under the condition of accurately judging the non-working state of the engine of the motorcycle, and improve the service life of the vehicle-mounted storage battery.
The invention is realized by the following technical scheme:
a method for detecting engine start includes the steps:
acquiring first data and second data, wherein the first data is triaxial acceleration data of a vehicle to be detected, and the second data is voltage signal data input by a storage battery of the vehicle to be detected;
vector processing is carried out on the first data, and calculation is carried out on the processed data to obtain third data;
performing calculation analysis on the second data to obtain fourth data;
performing data fusion on the third data and the fourth data to obtain fifth data;
and judging whether the fifth data is larger than a first threshold value, and if so, enabling an engine of the vehicle to be detected to be in a starting state.
In the traditional method for detecting whether the engine of the vehicle is started or not, the single voltage signal change or the single triaxial acceleration change is usually adopted for judging, but when the single method is adopted for judging whether the engine of the motorcycle is started or not, the single signal detection is inaccurate, so that judgment errors are often caused, and the accuracy of detecting whether the engine of the motorcycle is in a starting state is reduced.
Preferably, the substep of obtaining the third data comprises:
s21: vector sum processing is carried out on the first data to obtain the acceleration of the vehicle to be detected;
s22: calculating a first external force applied to the vehicle to be detected under a non-static state based on the parameter acceleration and the gravity acceleration;
s23: sampling the acceleration for a plurality of times in a period, repeating the steps S21 to S22 to obtain a plurality of first external forces, and calculating the average value of the first external forces;
s24: and performing unit removal and class normalization on the obtained average first external force to obtain third data.
Preferably, the sub-step of obtaining the fourth data comprises: and obtaining the current voltage value of the vehicle engine to be detected, performing difference operation on the current voltage value and the second data, and performing unit removal and class normalization operation on the value obtained after the difference operation to obtain fourth data.
Preferably, the specific expression obtained by the fifth data is:
x＝x1*0.7+x2*0.4
x is the fifth data, x1 is the third data, and x2 is the fourth data.
Preferably, the specific expression of the third data x1 is:
x1＝f/100mg
f is the average value of the first external force, 100mg is the median value of f generated by 150cc engine vibration;
the specific expression of the fourth data x2 is:
x2＝v/1V
v is the value obtained by performing unit removal and class normalization operation on the value obtained by the difference operation, and 1V is the median value of the voltage difference.
Preferably, the first threshold is a critical value of an engine of the vehicle to be detected in a start state and a flameout state.
The embodiment also provides a power supply control system of the vehicle networking terminal, which comprises a control module, an acceleration sensing module, a first voltage stabilizing module and a switching power supply module;
the control module is used for receiving the voltage signal, processing the voltage signal, realizing the detection method according to any one of claims 1-6, and controlling the switching power supply module according to the detection result;
the switching power supply module is used for supplying power to the communication unit of the Internet of vehicles terminal under the control of the control module;
the acceleration sensing module is used for measuring the triaxial acceleration of the vehicle to be detected and transmitting the detection result to the control module for processing.
The traditional car networking control system is characterized in that terminal equipment arranged on a motorcycle is higher in power consumption and more than thirty milliwatts in a state that the motorcycle does not work, and a vehicle-mounted storage battery is damaged in severe cases; the invention provides a power supply control system of a vehicle networking terminal, which is used for preventing the problem that a vehicle-mounted storage battery is damaged due to overdischarge by accurately detecting that the power consumption of the power supply system is in a lower state through outputting a level signal by a control module when an engine of a motorcycle is in a non-working state.
Preferably, the control system further comprises a first voltage stabilizing module and a second voltage stabilizing module,
the first voltage stabilizing module is used for supplying power to the control module and the acceleration sensor;
the second voltage stabilizing module is used for supplying power to peripheral devices under the control of the control module.
Preferably, in the control module, the controlling the switching power supply module according to the detection result specifically includes:
when the vehicle to be detected is detected to be in a starting state, a high-level signal is output to the switching power supply module;
and when the vehicle to be detected is detected to be in an un-started state, outputting a low-level signal to the switching power supply module.
The invention also provides a control method of the power supply of the vehicle networking terminal, which realizes the control system, and comprises the following steps:
when the engine of the vehicle to be detected is detected to be in a starting state, a high-level signal is sent to the switch power supply module through the control module, and the switch power supply module is triggered to output power;
when the engine of the vehicle to be detected is detected to be in a non-starting state, a low-level signal is sent to the switch power supply module through the control module, the peripheral circuit is controlled to be in a non-working state through the switch power supply module, and the acceleration sensing module is controlled to be in a low-power consumption detection state through the control module.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the engine starting detection method, the vehicle networking terminal power supply control method and the vehicle networking terminal power supply control system, the power consumption of the power supply of each circuit is controlled to be the lowest power consumption by the control switch power supply module after the engine of the vehicle is detected not to be in a working state, so that the power consumption of the whole power supply management system is smaller than thirty milliwatts, the phenomenon that the vehicle-mounted storage battery is damaged due to over-discharge is prevented, and the service life of the vehicle-mounted storage battery is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a detection method
FIG. 2 is a schematic diagram of a system
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order not to obscure the invention.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
Example 1
The embodiment discloses a method for detecting engine starting, as shown in fig. 1, the method comprises the following steps:
in this embodiment, the detection method is applied to an engine of a motorcycle as an example, and the significant features of the engine of the motorcycle when started are compared with those of the engine when not started: the motorcycle engine vibrates after being started and drives the whole vehicle frame to vibrate; because the on-board storage battery of the motorcycle is connected to the built-in generator of the motorcycle, after the engine of the motorcycle is started, the input voltage of the networking terminal of the motorcycle is the output voltage of the generator of the motorcycle, and compared with the voltage of the storage battery when the engine of the motorcycle is not started, the characteristics of voltage, voltage noise and the like can be distinguished.
Acquiring first data and second data, wherein the first data is triaxial acceleration data of a vehicle to be detected, and the second data is voltage signal data input by a storage battery of the vehicle to be detected;
in this embodiment, the detected first data is detected by a triaxial acceleration sensor arranged on the motorcycle, and the motorcycle networking terminal is fixed on the motorcycle frame by means of back adhesive bonding or binding, so that the motorcycle networking terminal can vibrate along with the frame. The triaxial acceleration sensor in the power management system of the motorcycle networking terminal can sense the acceleration of the motorcycle networking terminal caused by vibration, and the collected acceleration data is analyzed according to vibration characteristic statistics when the motorcycle engine starts to judge whether the motorcycle engine starts.
The second data is detected through the change characteristics of the voltage signals output by the storage battery on the motorcycle, and the input voltage signal characteristics of the power management system of the networking terminal of the motorcycle are different in the two states of starting and not starting of the motorcycle, so that the voltage signals need to be collected for analysis.
Vector processing is carried out on the first data, and calculation is carried out on the processed data to obtain third data;
the sub-step of obtaining the third data includes:
s21: vector sum processing is carried out on the first data to obtain the acceleration of the vehicle to be detected;
s22: calculating a first external force applied to the vehicle to be detected under a non-static state based on the parameter acceleration and the gravity acceleration;
s23: sampling the acceleration for a plurality of times in a period, repeating the steps S21 to S22 to obtain a plurality of first external forces, and calculating the average value of the first external forces;
s24: and performing unit removal and class normalization on the obtained average first external force to obtain third data.
The data sampled by the triaxial accelerometer are ax, ay and az, and the magnitude a of the acceleration vector sum of the device is as follows:since the vehicle is only affected by gravity when in static state, the magnitude of external force f0 = absolute value of a-g, g is the gravity acceleration, T ms is taken as a sampling period, the calculation result of B times of sampling is calculated to obtain f by means of arithmetic average, the value is taken as a value x1 for data fusion after unit removal and class normalization operation, the value is concretely expressed as x1 = f/100mg, and 100mg is the f median value generated by general 150cc engine vibration through experimental statistical analysis.
Performing calculation analysis on the second data to obtain fourth data;
the fourth data obtaining sub-step includes: and obtaining the current voltage value of the vehicle engine to be detected, performing difference operation on the current voltage value and the second data, and performing unit removal and class normalization operation on the value obtained after the difference operation to obtain fourth data.
Performing data fusion on the third data and the fourth data to obtain fifth data;
the specific expression obtained by the fifth data is:
x＝x1*0.7+x2*0.4
x is the fifth data, x1 is the third data, and x2 is the fourth data.
The specific expression of the fourth data x2 is:
x2＝v/1V
v is the value obtained by performing unit removal and class normalization operation on the value obtained by the difference operation, and 1V is the median value of the voltage difference.
Detecting the input voltage of the equipment at a sampling interval of 300ms, wherein the detected current voltage value is vn, and after the equipment is installed on a specific vehicle, the initial preset flameout state voltage value v0=12.6V preset by the equipment is updated according to the actual condition of the vehicle: update 1: the equipment is in a flameout state when being installed, and the voltage at the moment is collected and arithmetically averaged with a preset value; update 2: in the running process of the device, determining the voltage 0.4+0.6 of the current v0 after the flameout of the vehicle as updated v0; and calculating a difference V between the current voltage vn and V0, performing unit removal and class normalization on the V, and then using the difference V as a value x2, x2 = V/1V for data fusion once, wherein the median value of the voltage difference is 1V through data statistical analysis.
Judging whether the fifth data is larger than a first threshold value, if so, enabling an engine of the vehicle to be detected to be in a starting state; the first threshold is a critical value of an engine of the vehicle to be detected in a starting state and a flameout state.
The data of the sensor has errors, and a single method judgment can introduce larger system errors, so that the two judgment modes are fused, the system errors are reduced, the judgment accuracy is improved, and the final starting condition of the motorcycle engine is obtained. The data fusion method comprises the following steps: x=x1×0.7+x2×0.4; if x is more than 0.6, the vehicle is judged to be in a starting state, otherwise, the vehicle is judged to be in a flameout state.
According to the method for detecting engine starting disclosed by the embodiment, whether the engine is started or not is judged by comparing the two data after fusion with the set threshold value in a mode of combining the acceleration value with the input voltage signal characteristics, and the accuracy of judging the working state of the engine is improved.
Example two
The embodiment discloses a power supply control system of a vehicle networking terminal, which is shown in fig. 2 and comprises a control module, an acceleration sensing module, a first voltage stabilizing module and a switching power supply module;
the control module is configured to receive a voltage signal, process the voltage signal, implement the detection method according to the first embodiment, and control the switching power supply module according to the detection result;
in the control module, the switch power supply module is controlled according to the detection result specifically as follows:
when the vehicle to be detected is detected to be in a starting state, a high-level signal is output to the switching power supply module;
and when the vehicle to be detected is detected to be in an un-started state, outputting a low-level signal to the switching power supply module.
The switching power supply module is used for supplying power to the communication unit of the Internet of vehicles terminal under the control of the control module;
the acceleration sensing module is used for measuring the triaxial acceleration of the vehicle to be detected and transmitting the detection result to the control module for processing.
The control system also comprises a first voltage stabilizing module and a second voltage stabilizing module,
the first voltage stabilizing module is used for supplying power to the control module and the acceleration sensor;
the second voltage stabilizing module is used for supplying power to peripheral devices under the control of the control module.
The maximum current requirement of the core circuit is less than 150mA, and the characteristic of continuous power supply is needed, and a linear voltage stabilizer with low static current under light load (working state static current <5 uA) is selected in the core circuit path; according to the characteristic that the maximum required peak current of the peripheral circuit is not more than 3.5A and continuous power supply is not needed, a high-current high-efficiency switching power supply which can lose energy (the leakage current in the non-working state is less than 2uA and the static current in the working state is more than 100 uA) is selected at a peripheral current inlet.
Under the working condition of the motorcycle engine, the input voltage of the motorcycle networking terminal is 9-36V, the control module enters a normal working mode, the peripheral circuit switching power supply module is controlled to enter a working state by outputting a high level (EN_DCDC network high level) through a pin 46, 4.2V instantaneous maximum 3.5A direct current power supply is output, a communication unit of the motorcycle networking terminal is provided with power supply, the maximum 3.3V 150mA direct current power supply is output after being converted by the first voltage stabilizing module, and the power supply is provided for the peripheral sensor, namely, the power supply of the rest parts except the control module and the triaxial acceleration sensing module is all from the switching power supply. Under the condition, the first voltage stabilizing module, the switching power supply module and the second voltage stabilizing module all work normally, and the average overall consumption current of the equipment is about 100mA
After detecting that the motorcycle engine is not working, the control module outputs a low level (EN_DCDC network low level) through a pin 46 to control the peripheral circuit switching power supply to enter a non-working state, and the leakage current is less than 2uA; controlling the triaxial acceleration sensor to enter a low-power-consumption detection mode, wherein the triaxial acceleration sensor consumes 25uA in the mode; the MCU controls the MCU to enter a standby state, and the current consumption is less than 10uA; the static current of the linear power supply 1 for supplying power to the MCU and the triaxial acceleration sensor is less than 5uA in the low-load working state, and the leakage current of other peripheral circuits is 5-8uA; the overall current consumption of the device is less than 50uA, and calculated according to the average input voltage of 12V, the power consumption is 0.6mW.
The embodiment discloses a car networking terminal power control system, through the state of accurate judgement engine to through the mode of control module output high-low level control switch power module, control the consumption of the output of peripheral circuit, make control system's consumption keep always under thirty milliwatts, reduced the damage condition emergence that the vehicle-mounted battery appears because of overdischarge, increased vehicle-mounted battery's life.
Example III
The embodiment discloses a power control method of a terminal of the internet of vehicles, which is realized by a power control system in the second embodiment, and comprises the following steps:
when the engine of the vehicle to be detected is detected to be in a starting state, a high-level signal is sent to the switch power supply module through the control module, and the switch power supply module is triggered to output power;
when the engine of the vehicle to be detected is detected to be in a non-starting state, a low-level signal is sent to the switch power supply module through the control module, the peripheral circuit is controlled to be in a non-working state through the switch power supply module, and the acceleration sensing module is controlled to be in a low-power consumption detection state through the control module.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The method for detecting the engine start is characterized by comprising the following steps:
acquiring first data and second data, wherein the first data is triaxial acceleration data of a vehicle to be detected, and the second data is voltage signal data input by a storage battery of the vehicle to be detected;
vector processing is carried out on the first data, and calculation is carried out on the processed data to obtain third data;
the sub-step of obtaining the third data includes:
s21: vector sum processing is carried out on the first data to obtain the acceleration of the vehicle to be detected;
s22: calculating a first external force applied to the vehicle to be detected under a non-static state based on the parameter acceleration and the gravity acceleration;
s23: sampling the acceleration for a plurality of times in a period, repeating the steps S21 to S22 to obtain a plurality of first external forces, and calculating the average value of the first external forces;
s24: performing unit removal and class normalization on the obtained average first external force to obtain third data;
performing calculation analysis on the second data to obtain fourth data;
the fourth data obtaining sub-step includes: obtaining a current voltage value of a vehicle engine to be detected, performing difference operation on the current voltage value and the second data, and performing unit removal and class normalization operation on a numerical value obtained after the difference operation to obtain fourth data;
performing data fusion on the third data and the fourth data to obtain fifth data;
the specific expression obtained by the fifth data is:
x＝x1*0.7+x2*0.4
x is fifth data, x1 is third data, and x2 is fourth data;
and judging whether the fifth data is larger than a first threshold value, and if so, enabling an engine of the vehicle to be detected to be in a starting state.
2. The method for detecting engine start according to claim 1, wherein the specific expression of the third data x1 is:
x1＝f/100mg
f is the average value of the first external force, and 100mg is the median f value generated by 150cc engine vibration.
3. The method for detecting engine start according to claim 1, wherein the first threshold is a critical value of engine on state and off state of a vehicle to be detected.
4. The power supply control system of the vehicle networking terminal is characterized by comprising a control module, an acceleration sensing module, a first voltage stabilizing module and a switching power supply module;
the control module is used for receiving the voltage signal, processing the voltage signal, adopting the detection method according to any one of claims 1-3, and controlling the switching power supply module according to the detection result;
the switching power supply module is used for supplying power to the communication unit of the Internet of vehicles terminal under the control of the control module;
the acceleration sensing module is used for measuring the triaxial acceleration of the vehicle to be detected and transmitting the detection result to the control module for processing.
5. The system of claim 4, further comprising a first voltage stabilizing module and a second voltage stabilizing module,
the first voltage stabilizing module is used for supplying power to the control module and the acceleration sensor;
the second voltage stabilizing module is used for supplying power to peripheral devices under the control of the control module.
6. The power control system of an internet of vehicles terminal according to claim 5, wherein the control module controls the switching power supply module according to the detection result specifically comprises:
when the vehicle to be detected is detected to be in a starting state, a high-level signal is output to the switching power supply module;
and when the vehicle to be detected is detected to be in an un-started state, outputting a low-level signal to the switching power supply module.
7. The power supply control method for the terminal of the internet of vehicles is characterized by adopting the control system as claimed in any one of claims 4 to 5, and the method comprises the following steps:
when the engine of the vehicle to be detected is detected to be in a starting state, a high-level signal is sent to the switch power supply module through the control module, and the switch power supply module is triggered to output power;
when the engine of the vehicle to be detected is detected to be in a non-starting state, a low-level signal is sent to the switch power supply module through the control module, the peripheral circuit is controlled to be in a non-working state through the switch power supply module, and the acceleration sensing module is controlled to be in a low-power consumption detection state through the control module.
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| CN111307201A (en) * | 2019-08-26 | 2020-06-19 | 北京中位科技有限公司 | Vehicle state monitoring system and monitoring method |
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| GB9803037D0 (en) * | 1997-02-13 | 1998-04-08 | Nissan Motor | Electric energy supply system for vehicle |
| CN109791170A (en) * | 2016-07-01 | 2019-05-21 | 奥克托信息技术股份公司 | Method for determining vehicle-state by detection vehicle battery voltage |
| CN110901566A (en) * | 2018-09-18 | 2020-03-24 | 启碁科技股份有限公司 | Vehicle state monitoring system and vehicle state monitoring method |
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