CN116718859A - Device and method for diagnosing faults of automobile power supply line bundles - Google Patents
Device and method for diagnosing faults of automobile power supply line bundles Download PDFInfo
- Publication number
- CN116718859A CN116718859A CN202310833766.7A CN202310833766A CN116718859A CN 116718859 A CN116718859 A CN 116718859A CN 202310833766 A CN202310833766 A CN 202310833766A CN 116718859 A CN116718859 A CN 116718859A
- Authority
- CN
- China
- Prior art keywords
- power supply
- resistance
- hsd
- storage battery
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 149
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 62
- 239000003381 stabilizer Substances 0.000 claims description 17
- 238000003745 diagnosis Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 230000006870 function Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 101100524640 Homo sapiens RHBDD1 gene Proteins 0.000 description 5
- 102100032690 Rhomboid-related protein 4 Human genes 0.000 description 5
- 239000000306 component Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 101100119476 Homo sapiens FAM71B gene Proteins 0.000 description 2
- 102100034513 Protein FAM71B Human genes 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- 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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a device for diagnosing a fault of an automobile power supply line beam, which comprises: a storage battery; an electrical load; a battery data module; a power supply backbone MOSFET; the high-side driving chip HSD comprises a storage battery test resistor HSD and an electric load HSD; the channel change-over switch is used for switching the circuit channel; the test resistor comprises a storage battery test resistor and an electrical load test resistor, the storage battery test resistor is connected with the storage battery test resistor HSD, and the electrical load test resistor is connected with the electrical load through the channel change-over switch; an analog-to-digital converter; a temperature sensor; the main control chip MCU is connected with the high-side driving chip HSD, the analog-to-digital converter and the power supply main MOSFET, and the main control chip MUC is used for calculating the electrical load power supply line beam resistance and giving an alarm to an abnormal resistance value. The application also discloses a method for diagnosing the faults of the automobile power supply wire harness.
Description
Technical Field
The application relates to the field of vehicle detection, in particular to the field of automobile power supply line beam fault diagnosis.
Background
The main function of the automobile wire harness in the whole automobile electrical system is to transmit electric energy and transmission signals on a physical level. As requirements for reliability of automotive electronic and electrical systems become higher and higher for autopilot and functional safety, connection reliability of wiring harnesses also faces more stringent challenges. The failure of the automotive power supply line bundles, once it has occurred, will directly lead to failure of the electrical function, in extreme cases possibly leading to serious accidents or significant losses.
The assembly of the wire harness for electrical connection comprises terminals and wires. The electrical connection of the wiring harness may have different failure modes such as open circuit, short circuit, momentary break, increased contact resistance, etc. The resistance of the power supply line bundle loop is affected by factors such as climate environment, driving condition, and habit of using vehicles, and becomes larger and larger along with the increase of service life. When the resistance of the power supply line bundle is increased to a certain extent, the voltage loss on the line is increased, and the power supply voltage at the two ends of the electric appliance is insufficient, so that the normal operation of the electric appliance is affected.
Chinese patent CN101762769a discloses a fault diagnosis system for detecting a fault of a wire harness vehicle, comprising a connection device, a detection device, a control device and an output device; the connecting device is used for connecting the detecting device with the tested wire harness of the wire harness vehicle; the detection device detects the state of each line of the tested line bundle; the control device receives the detection signal and compares the detection signal with a pre-stored standard of the tested wire harness to judge the state of the tested wire harness; the output device outputs the state of the wire harness to be tested.
Although the device and the method disclosed in the above patent can conveniently realize the connection of the wire harness and the detection device, and improve the detection efficiency. However, the detection of the device and the method requires manual intervention, and cannot detect the vehicle in real time and detect the increase of the resistance of the wire harness.
Disclosure of Invention
In order to solve the problems, the embodiment of the application provides a device and a method for diagnosing the faults of an automobile power supply wire harness, which can realize on-line diagnosis of the faults of the power supply wire harness with increased contact resistance.
The embodiment of the application provides a device for diagnosing a fault of an automobile power supply line beam, which comprises the following components:
a storage battery;
an electrical load;
the storage battery data module is connected with the storage battery and is used for measuring the output voltage of the storage battery;
a power supply trunk MOSFET which controls on-off of current;
the high-side driving chip HSD is connected with the power supply trunk MOSFET, converts a low-voltage control signal into an output signal with high voltage and high current, and comprises a storage battery test resistor HSD and an electric load HSD;
the channel change-over switch is used for switching the circuit channel;
the test resistor comprises a storage battery test resistor and an electrical load test resistor, the storage battery test resistor is connected with the storage battery test resistor HSD, and the electrical load test resistor is connected with the electrical load through the channel change-over switch;
an analog-to-digital converter to convert an analog signal to a digital signal;
a temperature sensor that obtains the electrical load temperature;
the main control chip MCU is connected with the high-side driving chip HSD, the analog-to-digital converter and the power supply main MOSFET, and the main control chip MUC is used for calculating the electrical load power supply line beam resistance and giving an alarm to an abnormal resistance value.
Further, the device for diagnosing the fault of the automobile power supply line bundle, the electric load further comprises an electric power steering device, a vehicle body stabilizing device and a brake power assisting device, the electric load HSD further comprises the electric power steering device HSD, the vehicle body stabilizing device HSD and the brake power assisting device HSD, the electric power steering device is connected with the electric power steering device HSD, the vehicle body stabilizing device is connected with the vehicle body stabilizing device HSD, and the brake power assisting device is connected with the brake power assisting device HSD.
Further, the test resistor comprises an electric power steering device test resistor, a vehicle body stabilizing device test resistor and a brake booster device test resistor.
Further, the temperature sensor further comprises an electric power steering device temperature sensor, a vehicle body stabilizing device temperature sensor and a brake power assisting device temperature sensor.
The embodiment of the application also provides a method for diagnosing the faults of the automobile power supply wire harness, which comprises the following steps:
s1) obtaining a current value and a voltage value of a battery test resistor and calculating a battery power supply wire harness resistor;
s2) acquiring a current value and a voltage value of an electrical load test resistor and calculating an electrical load power supply line bundle resistor according to the storage battery power supply line bundle resistor;
s3) acquiring the ambient temperature of an electrical load test resistor and converting the resistance value of the electrical load power supply wire harness resistor to a standard electrical load power supply wire harness resistor;
s4) comparing the standard electric load power supply wire harness resistance with a preset electric load power supply wire harness resistance, and sending an alarm if the standard electric load power supply wire harness resistance exceeds a preset threshold value.
Further, in the method for diagnosing a fault of an automotive power supply harness, the step S1 further includes:
s11) sending an off command to the power supply main MOSFET and the electric load HSD and sending an on command to the storage battery test resistor HSD;
s12) acquiring a current value and a voltage value of a storage battery test resistor, wherein the current value of the storage battery test resistor is acquired through an analog-to-digital converter, and the voltage value of the storage battery test resistor is acquired through a storage battery data module;
s13) calculating the total power supply resistance of the storage battery by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the storage battery;
s14) calculating the storage battery power supply wire harness resistance according to the storage battery power supply total resistance, wherein the storage battery power supply wire harness resistance is obtained by subtracting the resistance value of the storage battery test resistance from the resistance value of the storage battery power supply total resistance.
Further, the method for diagnosing the fault of the automobile power supply wire harness, the electrical load test resistor comprises an electric power steering device test resistor, a vehicle body stabilizing device test resistor and a brake booster device test resistor, the electrical load power supply wire harness resistor comprises an electric power steering device power supply wire harness resistor, a vehicle body stabilizing device power supply wire harness resistor and a brake booster device power supply wire harness resistor, and the step S2 further comprises:
a step of acquiring the power supply harness resistance of the electric power steering device, wherein the step of acquiring the current value and the voltage value of the test resistance of the electric power steering device and calculating the power supply harness resistance of the electric power steering device according to the power supply harness resistance of the storage battery;
a step of acquiring the power supply harness resistance of the vehicle body stabilizing device, wherein the current value and the voltage value of the test resistance of the vehicle body stabilizing device are acquired, and the power supply harness resistance of the vehicle body stabilizing device is calculated according to the power supply harness resistance of the storage battery;
and a step of acquiring the power supply harness resistance of the brake booster, wherein the step of acquiring the current value and the voltage value of the test resistance of the brake booster is performed, and the power supply harness resistance of the brake booster is calculated according to the power supply harness resistance of the storage battery.
Further, in the method for diagnosing the fault of the automobile power supply wire harness, the step S1 is performed to obtain the current value and the voltage value of the storage battery test resistor according to the average value obtained by measuring a plurality of times.
Further, in the method for diagnosing the fault of the automobile power supply wire harness, the step S2 is performed to obtain the current value and the voltage value of the electric load test resistor according to the average value obtained by measuring a plurality of times.
Further, in the method for diagnosing the fault of the power supply wire harness of the automobile, the step of obtaining the resistance of the power supply wire harness of the electric power steering device further comprises the steps of:
sending a turn-off command to a storage battery test resistor HSD, a vehicle body stabilizing device HSD and a brake booster device HSD and sending a turn-on command to a power main MOSFET, an electric power steering device HSD and an electric power steering device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the electric power steering device through the electric power steering device HSD;
calculating the total resistance of the electric power steering device by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the electric power steering device;
and calculating the power supply wire harness resistance of the electric power steering device according to the total resistance of the electric power steering device, wherein the power supply wire harness resistance of the electric power steering device is obtained by subtracting the test resistance of the vehicle body stabilizing device and the power supply wire harness resistance of the storage battery from the total resistance of the electric power steering device.
Further, in the method for diagnosing the fault of the power supply wire harness of the automobile, the step of obtaining the resistance of the power supply wire harness of the automobile body stabilizing device further comprises the steps of:
sending a turn-off command to a storage battery test resistor HSD, an electric power steering device HSD and a brake power steering device HSD and sending a turn-on command to a power main MOSFET, a vehicle body stabilizing device HSD and a vehicle body stabilizing device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the vehicle body stabilizing device through the vehicle body stabilizing device HSD;
calculating the total resistance of the vehicle body stabilizing device by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the vehicle body stabilizing device;
and calculating the power supply wire harness resistance of the vehicle body stabilizing device according to the total resistance of the vehicle body stabilizing device, wherein the power supply wire harness resistance of the vehicle body stabilizing device is obtained by subtracting the test resistance of the vehicle body stabilizing device and the power supply wire harness resistance of the storage battery from the total resistance of the vehicle body stabilizing device.
Further, in the method for diagnosing the fault of the power supply wire harness of the automobile, the step of obtaining the resistance of the power supply wire harness of the brake booster further comprises:
sending a turn-off command to a storage battery test resistor HSD, an electric power steering device HSD and a vehicle body stabilizing device HSD and sending a turn-on command to a power main MOSFET, a brake power steering device HSD and a brake power steering device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the brake booster device through the brake booster device HSD;
according to the obtained current value and voltage value of the test resistor of the brake booster, calculating the total resistor of the brake booster by using an ohm theorem;
and calculating the power supply wire harness resistance of the brake booster according to the total resistance of the brake booster, wherein the power supply wire harness resistance of the brake booster is obtained by subtracting the test resistance of the brake booster and the power supply wire harness resistance of the storage battery from the total resistance of the brake booster.
The technical scheme provided by the embodiment of the application has the following advantages:
1. because the test resistor is used, the current value and the resistance value of the electric load can be accurately measured;
2. because the channel change-over switch is used, the on-line diagnosis can be conveniently carried out under the condition that the running of the vehicle is not influenced;
3. because the temperature sensor is used, the real-time temperature of the electric load can be conveniently obtained so as to accurately judge the resistance value of the power supply wire harness;
4. the resistance of the power supply line bundle of the storage battery is obtained in advance, so that the resistance value measurement of the power supply line bundle of the electric load is more accurate;
5. the fault condition can be accurately alerted due to the provision of the preset electrical load supply line bundle resistance.
Drawings
FIG. 1 is a block diagram of an apparatus for diagnosing a fault in an automotive power supply line bundle in accordance with an embodiment of the present application;
FIG. 2 is a flow chart of a preferred method for diagnosing a fault in an automotive power supply line bundle in accordance with an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application become more apparent, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, embodiments of the application. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Furthermore, unless specifically stated and limited otherwise, the terms "mounted," "connected," and the like in the description of the present application are used in a broad sense, and for example, the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements, and the specific meaning of the two elements can be understood by a person skilled in the art according to specific situations.
Fig. 1 is a block diagram of an apparatus for diagnosing a fault of an automotive power supply line bundle according to an embodiment of the present application. As shown in fig. 1, an apparatus for diagnosing a fault of an automotive power supply harness includes: a battery 10; an electrical load 20. The electrical load 20 further comprises: an electric power steering device 21, a body stabilizer 22, and a brake booster 23. A battery data module 30, the battery data module 30 being connected to the battery 10, the battery data module 30 being configured to measure an output voltage of the battery 10; a power supply trunk MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor Metal-Oxide semiconductor field effect transistor) 40, the power supply trunk MOSFET40 controlling on/off of current; a High-Side Driver (HSD) 50, the High-Side Driver HSD50 being connected to the power backbone MOSFET40, the High-Side Driver HSD50 converting a low-voltage control signal into an output signal of High voltage and High current, the High-Side Driver HSD50 including a battery test resistor HSD51 and electrical loads HSD (52 a, 52b and 52 c). The electrical loads HSD (52 a, 52b and 52 c) further comprise, according to a functional classification: electric power steering device HSD52a, body stabilizer HSD52b, and brake power steering device HSD52c. The electric power steering device HSD52a is connected to the electric power steering device 21, the body stabilizer HSD52b is connected to the body stabilizer 22, and the brake booster HSD52c is connected to the brake booster 23. A channel switching switch 60, the channel switching switch 60 being used to switch the circuit channel; the test resistor 70 includes a battery test resistor 71 and electrical load test resistors (72 a, 72b, and 72 c) of the test resistor 70. The load test resistor (72 a, 72b, 72 c) includes: an electric power steering device test resistor 72a for testing the electric power-feeding line bundle resistance of the electric power steering device 21, a body stabilizer test resistor 72b for testing the electric power-feeding line bundle resistance of the body stabilizer 22, and a brake booster test resistor 72c for testing the electric power-feeding line bundle resistance of the brake booster 23. The battery test resistor 71 is connected to the battery test resistor HSD51, and the electrical load test resistors (72 a, 72b, and 72 c) are connected to the electrical load 20 through the channel change-over switch 60; an analog-to-digital converter 80, the analog-to-digital converter 80 being configured to convert an analog signal into a digital signal; and temperature sensors (90 a, 90b, and 90 c) that acquire the electrical load temperature. The temperature sensors (90 a, 90b, 90 c) include: an electric power steering device temperature sensor 90a, a body stabilizer temperature sensor 90b, and a brake power steering device temperature sensor 90c. The electric power steering device temperature sensor 90a monitors the temperature of the electric power steering device 21, the vehicle body stabilizer temperature sensor 90b monitors the temperature of the vehicle body stabilizer 22, and the brake booster temperature sensor 90c monitors the temperature of the brake booster 23. The main control chip MCU100, the main control chip MCU100 is connected with the high-side driving chip HSD50, the analog-to-digital converter 80 and the power main MOSFET40, and the main control chip MUC100 is used for calculating the electrical load power supply line bundle resistance and giving an alarm to the abnormal resistance.
Preferably, the battery 10 is a 12V lead acid battery.
Preferably, the battery data module 30 communicates with the master control chip MUC100 via CAN protocol.
Preferably, the master control chip MUC100 is a core component for performing fault diagnosis of the power supply line bundle, and functions of operation, judgment and alarm. The master control chip MUC100 CAN control the on/off of the high-side driving chip HSD50 and the power backbone MOSFET40, and has the CAN communication function. The main control chip MUC100 may acquire real-time detection data, environmental temperature sensor data, etc. sent by other components in the system, such as the battery data module 30, and transmit information to the meter or the central control screen to prompt the user when it is determined that a fault or risk occurs.
Preferably, the electrical load 20 communicates through the CAN protocol to receive control commands of the master control chip MUC 100.
Preferably, the test resistor 70 is a high precision resistor of 100 ohms.
Preferably, the channel change-over switch 60 is a relay.
FIG. 2 is a flow chart of a preferred method for diagnosing a fault in an automotive power supply line bundle in accordance with an embodiment of the present application. As shown in fig. 2, a method for diagnosing a fault of an automotive power supply harness includes:
s1) obtaining a current value and a voltage value of a battery test resistor and calculating a battery power supply wire harness resistor;
s2) acquiring a current value and a voltage value of an electrical load test resistor and calculating an electrical load power supply line bundle resistor according to the storage battery power supply line bundle resistor;
s3) acquiring the ambient temperature of an electrical load test resistor and converting the resistance value of the electrical load power supply wire harness resistor to a standard electrical load power supply wire harness resistor;
s4) comparing the standard electric load power supply wire harness resistance with a preset electric load power supply wire harness resistance, and sending an alarm if the standard electric load power supply wire harness resistance exceeds a preset threshold value.
The method for diagnosing the fault of the power supply line bundle of the automobile according to the embodiment of the application is further specifically described below with reference to fig. 2.
Step S1) obtaining a current value and a voltage value of a battery test resistor and calculating the resistance of a battery power supply wire harness.
Specifically, step S1 further includes:
s11) sending an off command to the power supply main MOSFET and the electric load HSD and sending an on command to the storage battery test resistor HSD;
s12) acquiring a current value and a voltage value of a storage battery test resistor, wherein the current value of the storage battery test resistor is acquired through an analog-to-digital converter, and the voltage value of the storage battery test resistor is acquired through a storage battery data module;
s13) calculating the total power supply resistance of the storage battery by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the storage battery;
s14) calculating the storage battery power supply wire harness resistance according to the storage battery power supply total resistance, wherein the storage battery power supply wire harness resistance is obtained by subtracting the resistance value of the storage battery test resistance from the resistance value of the storage battery power supply total resistance.
In this embodiment, preferably, the analog-to-digital converter is used to collect the output current of the battery test resistor HSD, and the output current of the battery test resistor HSD may be converted to obtain the actual current by collecting the voltage value of the current feedback pin of the HSD chip. The output voltage of the battery is measured by the battery data module 30 and is obtained by the CAN protocol.
Preferably, the current value and the voltage value of the battery test resistor are obtained according to a plurality of measurement averages. In this embodiment, preferably, the current and the voltage may be continuously collected for 10 times, the recommended interval time is 10us, and the average value of the current and the voltage collected for 10 times is calculated as the measured value.
Step S2) obtaining a current value and a voltage value of the electric load test resistor and calculating the electric load power supply line bundle resistor according to the storage battery power supply line bundle resistor.
The electric load power supply line bundle resistor comprises an electric power steering device power supply bundle resistor, a vehicle body stabilizing device power supply bundle resistor and a brake booster device power supply bundle resistor. The current value of the electrical load test resistor can be converted to obtain actual current by collecting the voltage value of the current feedback pin of the HSD chip. The output voltage of the electric load test resistor can be converted to obtain the actual voltage by collecting the voltage of the load output pin of the HSD chip after the voltage is reduced by the operational amplifier circuit.
In this embodiment, step S2 preferably further includes:
a step of acquiring the power supply harness resistance of the electric power steering device, wherein the step of acquiring the current value and the voltage value of the test resistance of the electric power steering device and calculating the power supply harness resistance of the electric power steering device according to the power supply harness resistance of the storage battery;
a step of acquiring the power supply harness resistance of the vehicle body stabilizing device, wherein the current value and the voltage value of the test resistance of the vehicle body stabilizing device are acquired, and the power supply harness resistance of the vehicle body stabilizing device is calculated according to the power supply harness resistance of the storage battery;
and a step of acquiring the power supply harness resistance of the brake booster, wherein the step of acquiring the current value and the voltage value of the test resistance of the brake booster is performed, and the power supply harness resistance of the brake booster is calculated according to the power supply harness resistance of the storage battery.
Preferably, the electric power steering apparatus power supply harness resistance obtaining step further includes:
sending a turn-off command to a storage battery test resistor HSD, a vehicle body stabilizing device HSD and a brake booster device HSD and sending a turn-on command to a power main MOSFET, an electric power steering device HSD and an electric power steering device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the electric power steering device through the electric power steering device HSD;
calculating the total resistance of the electric power steering device by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the electric power steering device;
and calculating the power supply wire harness resistance of the electric power steering device according to the total resistance of the electric power steering device, wherein the power supply wire harness resistance of the electric power steering device is obtained by subtracting the test resistance of the vehicle body stabilizing device and the power supply wire harness resistance of the storage battery from the total resistance of the electric power steering device.
Preferably, the stabilizing device power supply harness resistance obtaining step further includes:
sending a turn-off command to a storage battery test resistor HSD, an electric power steering device HSD and a brake power steering device HSD and sending a turn-on command to a power main MOSFET, a vehicle body stabilizing device HSD and a vehicle body stabilizing device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the vehicle body stabilizing device through the vehicle body stabilizing device HSD;
calculating the total resistance of the vehicle body stabilizing device by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the vehicle body stabilizing device;
and calculating the power supply wire harness resistance of the vehicle body stabilizing device according to the total resistance of the vehicle body stabilizing device, wherein the power supply wire harness resistance of the vehicle body stabilizing device is obtained by subtracting the test resistance of the vehicle body stabilizing device and the power supply wire harness resistance of the storage battery from the total resistance of the vehicle body stabilizing device.
Preferably, the brake booster power supply harness resistance obtaining step further includes:
sending a turn-off command to a storage battery test resistor HSD, an electric power steering device HSD and a vehicle body stabilizing device HSD and sending a turn-on command to a power main MOSFET, a brake power steering device HSD and a brake power steering device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the brake booster device through the brake booster device HSD;
according to the obtained current value and voltage value of the test resistor of the brake booster, calculating the total resistor of the brake booster by using an ohm theorem;
and calculating the power supply wire harness resistance of the brake booster according to the total resistance of the brake booster, wherein the power supply wire harness resistance of the brake booster is obtained by subtracting the test resistance of the brake booster and the power supply wire harness resistance of the storage battery from the total resistance of the brake booster.
Preferably, the current value and the voltage value of the electrical load test resistor are obtained according to a plurality of measurement averages. The current and the voltage can be respectively and continuously collected for 10 times, the recommended value of the interval time is 10us, and the average value of the current and the voltage collected for 10 times is respectively calculated as a measured value.
Step S3) obtaining the ambient temperature of the electrical load test resistor and converting the resistance value of the electrical load power supply wire harness resistor to a standard electrical load power supply wire harness resistor.
Specifically, since the ambient temperature affects the resistance value of the power supply line bundle, it is necessary to exclude the factor of the ambient temperature at the time of calculation. The specific method is to introduce an ambient temperature parameter of the area where the power supply line beam is located, and the ambient temperature can be provided in real time by a temperature sensor arranged at the nearest position of the area.
Preferably, the calculation expression for converting the resistance value of the electrical load power supply wire harness resistance to the standard electrical load power supply wire harness resistance is:
R room ＝R/[1+α(T-20)]；
wherein T is the real-time environmental temperature of the electrical load obtained by the temperature sensor;
R room a supply line bundle resistance for a standard electrical load;
r is the electrical load supply line bundle resistance;
alpha is the ambient temperature coefficient.
Notably, if the standard electrical load power harness resistance at room temperature of 20 ℃ is to be calculated, the ambient temperature coefficient value may be 0.00393.
And S4) comparing the standard electric load power supply wire harness resistance with a preset electric load power supply wire harness resistance, and sending an alarm if the standard electric load power supply wire harness resistance exceeds a preset threshold value.
In this embodiment, the criterion for determining whether the resistance value of the power supply wire harness of the electrical load exceeds the standard is that the voltage drop on the power supply wire harness cannot exceed 1.5V under the current at which the electrical load operates normally. From this, the upper limit value of the corresponding power supply line bundle resistance can be calculated for different operating currents, as in some examples listed in table 1.
Table 1 power supply line beam resistance limits for different operating currents:
under the corresponding working current, when the measured resistance of the power supply wire harness exceeds the preset limit value, and the preferred value is 80%, the system judges that the power supply wire harness is aged or has potential faults, and risk early warning can be performed in advance.
When the measured resistance of the power supply harness exceeds, for example, 100% of the limit, the system determines that the harness is faulty, and the user is required to be prompted to go to a maintenance site for comprehensive inspection and part replacement.
In this embodiment, preferably, when the method for diagnosing the fault of the power supply harness of the automobile is finished, the channel switch 60 can be controlled to switch the circuit to the electrical load so as to ensure the normal operation of the system function.
The device and the method for diagnosing the faults of the power supply wire harness of the automobile can realize the function of diagnosing the faults of the power supply wire harness with increased contact resistance on line, can be integrated in the automobile, can greatly improve the power supply reliability and safety of a safety-related electrical system, and avoid functional failure caused by the faults of the power supply wire harness.
The technical scheme provided by the embodiment of the application has the following advantages:
1. because the test resistor is used, the current value and the resistance value of the electric load can be accurately measured;
2. because the channel change-over switch is used, the on-line diagnosis can be conveniently carried out under the condition that the running of the vehicle is not influenced;
3. because the temperature sensor is used, the real-time temperature of the electric load can be conveniently obtained so as to accurately judge the resistance value of the power supply wire harness;
4. the resistance of the power supply line bundle of the storage battery is obtained in advance, so that the resistance value measurement of the power supply line bundle of the electric load is more accurate;
5. the fault condition can be accurately alerted due to the provision of the preset electrical load supply line bundle resistance.
Those of skill in the art would understand that information, signals, and data may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The various illustrative logical modules, and circuits described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disk) as used herein include Compact Disc (CD), laser disc, optical disc, digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disk) usually reproduce data magnetically, while discs (disk) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
The embodiments described above are intended to provide those skilled in the art with a full range of modifications and variations to the embodiments described above without departing from the spirit of the application, and therefore the scope of the application is not limited to the embodiments described above, but is to be accorded the broadest scope consistent with the novel features set forth in the claims.
Claims (12)
1. An apparatus for automotive power supply line bundle fault diagnosis, comprising:
a storage battery;
an electrical load;
the storage battery data module is connected with the storage battery and is used for measuring the output voltage of the storage battery;
a power supply trunk MOSFET which controls on-off of current;
the high-side driving chip HSD is connected with the power supply trunk MOSFET, converts a low-voltage control signal into an output signal with high voltage and high current, and comprises a storage battery test resistor HSD and an electric load HSD;
the channel change-over switch is used for switching the circuit channel;
the test resistor comprises a storage battery test resistor and an electrical load test resistor, the storage battery test resistor is connected with the storage battery test resistor HSD, and the electrical load test resistor is connected with the electrical load through the channel change-over switch;
an analog-to-digital converter to convert an analog signal to a digital signal;
a temperature sensor that obtains the electrical load temperature;
the main control chip MCU is connected with the high-side driving chip HSD, the analog-to-digital converter and the power supply main MOSFET, and the main control chip MUC is used for calculating the electrical load power supply line beam resistance and giving an alarm to an abnormal resistance value.
2. The apparatus for diagnosing a power-supply-line bundle failure according to claim 1, wherein the electric load further includes an electric power steering apparatus, a body stabilizer, and a brake booster apparatus, the electric load HSD further includes an electric power steering apparatus HSD, a body stabilizer HSD, and a brake booster apparatus HSD, the electric power steering apparatus is connected to the electric power steering apparatus HSD, the body stabilizer is connected to the body stabilizer HSD, and the brake booster apparatus is connected to the brake booster apparatus HSD.
3. The apparatus for diagnosing a power-line bundle fault of an automobile according to claim 1, wherein the test resistor includes an electric power steering apparatus test resistor, a body stabilizer test resistor, and a brake booster test resistor.
4. The apparatus for diagnosing a power-supply-line bundle failure of an automobile according to claim 1, wherein the temperature sensor further includes an electric power steering apparatus temperature sensor, a body stabilizer temperature sensor, and a brake booster temperature sensor.
5. A method of automotive power supply line bundle fault diagnosis, comprising:
s1) obtaining a current value and a voltage value of a battery test resistor and calculating a battery power supply wire harness resistor;
s2) acquiring a current value and a voltage value of an electrical load test resistor and calculating an electrical load power supply line bundle resistor according to the storage battery power supply line bundle resistor;
s3) acquiring the ambient temperature of an electrical load test resistor and converting the resistance value of the electrical load power supply wire harness resistor to a standard electrical load power supply wire harness resistor;
s4) comparing the standard electric load power supply wire harness resistance with a preset electric load power supply wire harness resistance, and sending an alarm if the standard electric load power supply wire harness resistance exceeds a preset threshold value.
6. The method for diagnosing a beam fault of an automotive power supply line according to claim 5, characterized in that the step S1 further comprises:
s11) sending an off command to the power supply main MOSFET and the electric load HSD and sending an on command to the storage battery test resistor HSD;
s12) acquiring a current value and a voltage value of a storage battery test resistor, wherein the current value of the storage battery test resistor is acquired through an analog-to-digital converter, and the voltage value of the storage battery test resistor is acquired through a storage battery data module;
s13) calculating the total power supply resistance of the storage battery by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the storage battery;
s14) calculating the storage battery power supply wire harness resistance according to the storage battery power supply total resistance, wherein the storage battery power supply wire harness resistance is obtained by subtracting the resistance value of the storage battery test resistance from the resistance value of the storage battery power supply total resistance.
7. The method of claim 5, wherein the electrical load test resistor comprises an electric power steering device test resistor, a body stabilizer test resistor, and a brake booster test resistor, the electrical load power supply line resistor comprises an electric power steering device power supply line resistor, a body stabilizer power supply line resistor, and a brake booster power supply line resistor, and the step S2 further comprises:
a step of acquiring the power supply harness resistance of the electric power steering device, wherein the step of acquiring the current value and the voltage value of the test resistance of the electric power steering device and calculating the power supply harness resistance of the electric power steering device according to the power supply harness resistance of the storage battery;
a step of acquiring the power supply harness resistance of the vehicle body stabilizing device, wherein the current value and the voltage value of the test resistance of the vehicle body stabilizing device are acquired, and the power supply harness resistance of the vehicle body stabilizing device is calculated according to the power supply harness resistance of the storage battery;
and a step of acquiring the power supply harness resistance of the brake booster, wherein the step of acquiring the current value and the voltage value of the test resistance of the brake booster is performed, and the power supply harness resistance of the brake booster is calculated according to the power supply harness resistance of the storage battery.
8. The method for diagnosing a power supply line beam fault as recited in claim 5, wherein the step S1 is performed by obtaining the current and voltage values of the battery test resistor according to a plurality of measurements.
9. The method for diagnosing a beam fault in an automotive power supply line according to claim 5 or 7, wherein the step S2 is performed by obtaining the current value and the voltage value of the electrical load test resistor according to a plurality of measurement averages.
10. The method for diagnosing a power supply line harness as recited in claim 7, wherein the electric power steering apparatus power supply line harness resistance obtaining step further comprises:
sending a turn-off command to a storage battery test resistor HSD, a vehicle body stabilizing device HSD and a brake booster device HSD and sending a turn-on command to a power main MOSFET, an electric power steering device HSD and an electric power steering device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the electric power steering device through the electric power steering device HSD;
calculating the total resistance of the electric power steering device by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the electric power steering device;
and calculating the power supply wire harness resistance of the electric power steering device according to the total resistance of the electric power steering device, wherein the power supply wire harness resistance of the electric power steering device is obtained by subtracting the test resistance of the vehicle body stabilizing device and the power supply wire harness resistance of the storage battery from the total resistance of the electric power steering device.
11. The method for diagnosing a power supply line harness as recited in claim 7, wherein the body stabilization device power supply line harness resistance obtaining step further comprises:
sending a turn-off command to a storage battery test resistor HSD, an electric power steering device HSD and a brake power steering device HSD and sending a turn-on command to a power main MOSFET, a vehicle body stabilizing device HSD and a vehicle body stabilizing device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the vehicle body stabilizing device through the vehicle body stabilizing device HSD;
calculating the total resistance of the vehicle body stabilizing device by using an ohm theorem according to the obtained current value and voltage value of the test resistance of the vehicle body stabilizing device;
and calculating the power supply wire harness resistance of the vehicle body stabilizing device according to the total resistance of the vehicle body stabilizing device, wherein the power supply wire harness resistance of the vehicle body stabilizing device is obtained by subtracting the test resistance of the vehicle body stabilizing device and the power supply wire harness resistance of the storage battery from the total resistance of the vehicle body stabilizing device.
12. The method for diagnosing a power supply line harness as recited in claim 7, wherein the brake booster power supply line harness resistance obtaining step further comprises:
sending a turn-off command to a storage battery test resistor HSD, an electric power steering device HSD and a vehicle body stabilizing device HSD and sending a turn-on command to a power main MOSFET, a brake power steering device HSD and a brake power steering device test resistor change-over switch;
acquiring a current value and a voltage value of a test resistor of the brake booster device through the brake booster device HSD;
according to the obtained current value and voltage value of the test resistor of the brake booster, calculating the total resistor of the brake booster by using an ohm theorem;
and calculating the power supply wire harness resistance of the brake booster according to the total resistance of the brake booster, wherein the power supply wire harness resistance of the brake booster is obtained by subtracting the test resistance of the brake booster and the power supply wire harness resistance of the storage battery from the total resistance of the brake booster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310833766.7A CN116718859A (en) | 2023-07-07 | 2023-07-07 | Device and method for diagnosing faults of automobile power supply line bundles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310833766.7A CN116718859A (en) | 2023-07-07 | 2023-07-07 | Device and method for diagnosing faults of automobile power supply line bundles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116718859A true CN116718859A (en) | 2023-09-08 |
Family
ID=87873375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310833766.7A Pending CN116718859A (en) | 2023-07-07 | 2023-07-07 | Device and method for diagnosing faults of automobile power supply line bundles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116718859A (en) |
-
2023
- 2023-07-07 CN CN202310833766.7A patent/CN116718859A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5760587A (en) | Battery measurement method | |
| US5337013A (en) | Method and apparatus for monitoring the operation of electrical loads in an automotive vehicle | |
| US8164433B2 (en) | Detecting faults in a wiring harness | |
| CN102463905B (en) | Diagnosis of HEV/EV battery disconnect system | |
| CN111090027B (en) | High voltage system and method for monitoring an insulation fault in a high voltage system | |
| US9250294B2 (en) | Method for detecting a switching position of a switching device | |
| US20100138125A1 (en) | Device and method for monitoring a magnetic brake on rail vehicles | |
| US10215789B2 (en) | Device and method for monitoring a high-voltage contactor in a vehicle | |
| US20120098547A1 (en) | Semiconductor circuit, semiconductor device, method of diagnosing abnormality of wire, and computer readable storage medium | |
| WO2011018910A1 (en) | Charging cable insulation testing device for quick charger for electric vehicle | |
| US6664802B2 (en) | System and method for diagnosing fault conditions associated with powering an electrical load | |
| CN110673054B (en) | DC/DC power supply test system and aging test method of DC/DC power supply | |
| JP2021045023A (en) | Power supply device | |
| KR100993587B1 (en) | Junction box of vehicle having failure diagnostic system | |
| US6830843B2 (en) | Method for controlling the quality of the coolant for fuel cell systems | |
| KR101413429B1 (en) | Junction box and method of diagnosing the junction box | |
| CN116718859A (en) | Device and method for diagnosing faults of automobile power supply line bundles | |
| CN108469565B (en) | Power failure diagnosis method and application thereof in power failure diagnosis | |
| CN111751757A (en) | Fault detection circuit and method for vehicle-mounted indicator lamp | |
| CN116852996A (en) | Motor controller, detection method and vehicle | |
| KR100310971B1 (en) | method for testing a wire harness and system for performming the same | |
| CN113906302A (en) | Method for determining the resistance of an electrical supply line | |
| CN113406486B (en) | Relay detection circuit, relay detection method, relay, power system and automobile | |
| US7924021B2 (en) | Procedure for testing the function of a lamp circuit | |
| CN213482396U (en) | Relay detection circuit and detection device based on positive and negative poles |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |