CN109406171B - Static and dynamic fault simulation analyzer of vehicle braking system and detection method thereof - Google Patents
Static and dynamic fault simulation analyzer of vehicle braking system and detection method thereof Download PDFInfo
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- CN109406171B CN109406171B CN201910039909.0A CN201910039909A CN109406171B CN 109406171 B CN109406171 B CN 109406171B CN 201910039909 A CN201910039909 A CN 201910039909A CN 109406171 B CN109406171 B CN 109406171B
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- 238000004088 simulation Methods 0.000 title claims abstract description 115
- 230000003068 static effect Effects 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 title claims abstract description 10
- 238000003745 diagnosis Methods 0.000 claims abstract description 59
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000012423 maintenance Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims description 21
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- 239000007788 liquid Substances 0.000 claims description 18
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- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 230000002035 prolonged effect Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- 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
Abstract
The invention discloses a static and dynamic fault simulation analyzer of a vehicle braking system and a detection method thereof. The invention adopts the signal simulation generator and the switcher, the output signal of the sensor of the original vehicle is simulated by the signal simulation generator, the output signal of the sensor of the original vehicle is selected by the switcher or the output signal of the signal simulation sensor is transmitted to the ABS control unit, and under the ABS anti-lock test mode, the ABS anti-lock test can be completed without a road test, thereby saving time and reducing the test risk; the data information of each sensor of the ABS system can be rapidly measured through the whole vehicle control unit diagnosis system, and the related information of one or more control units in the whole vehicle control unit can be read; the invention provides convenience for brake test and fault maintenance of the anti-lock brake system of the automobile.
Description
Technical Field
The invention relates to an automobile detection technology, in particular to a static and dynamic fault simulation analyzer of a vehicle braking system and a detection method thereof.
Background
An ABS is an electronic system for car, which includes an electronic ABS control unit, several wheel speed sensors and a valve assembly with electromagnetic valve. The electronic control unit grasps the running state of the wheel through the pulse variation transmitted by the wheel speed sensor. When a certain wheel is likely to generate a locking state, the electronic control unit sends an instruction to the electric valve, so that the electric valve can achieve the purposes of controlling braking and adjusting wheel speed through a quick switch.
If the ABS is in failure, the braking distance is prolonged in emergency braking, and unpredictable potential safety hazards occur.
(1) When the traditional detection ABS works normally, firstly, a fault code and a data stream are required to be read by using a detector, then a road test is carried out when no fault code exists, the speed of a vehicle is required to be improved in the road test, then a brake pedal is pressed in an emergency, and if the brake pedal has the feeling of bouncing, the ABS works normally. When the ABS is conventionally tested, a lot of time and effort are consumed, and an unexpected occurrence is caused by an emergency brake during a road test.
(2) When the circuit of ABS is overhauld to the tradition, need pull out ABS control unit plug, measure in plug department, general vehicle ABS control unit mounted position is too narrow and small, leads to measuring inconvenient.
(3) In ABS, a wheel speed sensor is frequently failed, and in the conventional detection of the wheel speed sensor, a detector is first used to read a failure code, and then the data flow of the wheel speed sensor is read, and if the detector shows that the wheel speed sensor is failed, the failure is likely to be the failure of the wheel speed sensor, and also likely to be the failure of a wire harness between the wheel speed sensor and the ABS control unit. Then a new wheel speed sensor is typically replaced and then a test run is performed, which indicates a failure of the wheel speed sensor if the failure has disappeared, and a failure of the wire harness if the failure still exists, which consumes a lot of time and effort during the troubleshooting process.
(4) In ABS, when ABS control unit breaks down, at first use the detector to read the trouble code, if the detector shows that ABS control unit damages, then need to change new ABS control unit under the general circumstances, in order to reduce cost of maintenance, can maintain to ABS control unit, need use conventional instrument such as universal meter to maintain in traditional maintenance process, the maintenance time period is long, unable accurate judgement trouble point's position, secondly when changing new ABS control unit or tearing open the car spare, because ABS control unit itself is electronic component, need detect it, test function is normal after loading under the general circumstances, loading test can lead to unnecessary trouble, consume energy and time.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a static and dynamic fault simulation analyzer of a vehicle braking system and a detection method thereof, and provides convenience for braking test and fault maintenance of an anti-lock braking system of an automobile.
The left front wheel, the right front wheel, the left rear wheel and the right rear wheel of the original vehicle are respectively provided with a first wheel speed sensor, a brake pedal is connected with a brake master cylinder through a lever, the brake master cylinder is connected with an ABS (anti-lock brake system) pump through a brake oil pipe, the ABS pump is respectively connected to a first ABS liquid inlet and outlet electromagnetic valve and a fourth ABS liquid inlet and outlet electromagnetic valve, the first ABS liquid inlet and outlet electromagnetic valve and the fourth ABS liquid outlet electromagnetic valve are respectively connected to brake sub pumps on the four wheels through the brake oil pipe, and the brake sub pumps of the left front wheel and the right front wheel of the two front wheels are respectively provided with a first brake pressure sensor and a second brake pressure sensor so as to detect brake pressure, and a brake pedal signal switch is arranged behind the brake pedal; first to fourth wheel speed sensors, first and second brake pressure sensors, and a brake pedal signal switch, collectively referred to as an original vehicle sensor; the ABS control unit is internally connected with an ABS pump, an ABS electromagnetic valve relay and first to fourth ABS liquid inlet and outlet electromagnetic valves, the ABS electromagnetic valve relay is connected to the ABS pump, and the ABS pump is respectively connected to the first to fourth ABS liquid inlet and outlet electromagnetic valves; the ABS pump, the ABS electromagnetic valve relay and the first to fourth ABS liquid inlet and outlet electromagnetic valves are collectively called as an original vehicle actuator; the wheel speed sensor transmits a wheel speed signal to the ABS control unit, if the wheel speed of the wheel exceeds a threshold speed per hour, and the brake pedal is stepped on, the brake pressure sensor transmits a brake pressure signal to the ABS control unit, when the brake pedal is stepped on suddenly, the brake pedal signal switch transmits a brake pedal signal to the ABS control unit, the ABS control unit sends an emergency brake signal after receiving the brake pedal signal, the ABS control unit controls the ABS electromagnetic valve relay to be attracted, the ABS pump works, and the first to fourth ABS liquid inlet and outlet electromagnetic valves are controlled to control the brake cylinder on the four wheels to realize a point brake effect.
Connecting wires of the original car sensors correspond to connecting wires of the ABS control unit; connecting wires of the original car sensors are arranged on connecting wire plugs, connecting wires of the ABS control units are arranged on the control unit plugs, and the connecting wire plugs are connected with the control unit plugs, so that the original car sensors are connected to the ABS control units of the original car.
An object of the present invention is to provide a vehicle brake system static and dynamic fault simulation analyzer.
The invention relates to a vehicle braking system static and dynamic fault simulation analyzer, which comprises: a signal simulation generator and a switcher; the signal simulation generator comprises first to fourth wheel speed signal generators, first to fourth wheel speed adjusting buttons, first to fourth wheel speed signal output switches, first to second brake pressure signal generators, first and second brake pressure adjusting buttons and output switches, a brake pedal signal output switch, a full vehicle control unit diagnosis system and an on-board diagnosis system OBD diagnosis port, wherein the first to fourth wheel speed adjusting buttons are respectively connected with the corresponding first to fourth wheel speed signal generators, the first to fourth wheel speed signal output switches are respectively connected with the first to fourth wheel speed signal generators, the first and second brake pressure adjusting buttons and the output switches are respectively connected with the first and second brake pressure signal generators, the first to fourth wheel speed signal generators, the first and second brake pressure signal generators and the brake pedal signal output switch are collectively called simulation sensors, and each simulation sensor, the OBD diagnosis port and the full vehicle control unit diagnosis system are respectively arranged on the generator plug through wires; the switcher comprises a generator input end, an original car signal input end, an output end and a group of switch elements, wherein the switch elements correspond to connecting wires, communication wires and power supply wires of the original car sensor; pulling out a control unit plug from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor; the generator plug is connected to the generator input end of the switcher, the connecting wire plug is connected to the original car signal input end of the switcher, the output end of the switcher is connected to the control unit plug, so that each original car sensor is respectively connected in series with a corresponding switching element to the ABS control unit, the original car communication wire is respectively connected in parallel with the whole car control unit diagnosis system and the OBD diagnosis port of the signal simulation generator through the corresponding switching element in series, the power supply wire is connected to the signal simulation generator through the corresponding switching element in series, and the signal simulation generator is connected to the ABS control unit; the switching elements corresponding to the communication lines and the power supply lines are closed, one or more of the original vehicle sensors are selected to be disconnected with the ABS control unit, and the corresponding switching elements are disconnected, so that the selected original vehicle sensors are disconnected with the ABS control unit, and meanwhile, the signal output switches of the corresponding analog sensors are opened, so that the signal analog generator outputs one or more of corresponding wheel speed signals, brake pressure signals and brake pedal signals to the ABS control unit; the corresponding wheel speed signal generator is controlled by the wheel speed adjusting button to generate a corresponding wheel speed signal to be transmitted to the ABS control unit, the brake pressure signal generator is adjusted by the brake pressure adjusting button and the output switch to send a brake pressure signal to the ABS control unit, the brake pedal signal is controlled by the brake pedal signal output switch to output a brake pedal signal, information in the whole vehicle control unit diagnosis system is used, if the wheel speed signal received by the ABS control unit exceeds a threshold time speed and the brake pressure signal is received, the ABS control unit sends an emergency brake signal after receiving the brake pedal signal to control the ABS electromagnetic valve relay to be attracted, the ABS pump works, and the brake sub pumps on the four wheels are controlled by the first to fourth ABS liquid inlet and outlet electromagnetic valves to work to realize a point brake effect.
The signal simulation generator further comprises a shell and a circuit board, wherein the first to fourth wheel speed signal generators, the first to fourth wheel speed adjusting buttons, the first to fourth wheel speed signal output switches, the first and second brake pressure signal generators, the first and second brake pressure adjusting buttons and output switches, the brake pedal signal output, the whole vehicle control unit diagnosis system and the OBD diagnosis port switch are all arranged on the circuit board, and the circuit board is arranged in the shell. The whole vehicle control unit diagnosis system comprises a diagnosis instrument display screen and a diagnosis instrument operation button, wherein the diagnosis instrument operation button is connected to the diagnosis instrument display screen, and a communication line is connected to the diagnosis instrument display screen.
The switching element of the switcher adopts a switch or a bridging point and a bridging plug. Further, the switcher further comprises a housing, the generator input end, the original car signal input end and the output end are respectively arranged on the housing, and a group of switch elements are arranged in the housing.
Another object of the present invention is to provide a method for detecting a static and dynamic fault simulation analyzer of a vehicle brake system.
The invention relates to a method for testing an ABS anti-lock function by a vehicle braking system static and dynamic fault simulation analyzer, which comprises the following steps:
1) Lifting the tested vehicle;
2) Closing an ignition switch of the tested vehicle;
3) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
4) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original vehicle signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original vehicle sensors are respectively connected with corresponding switching elements in series to the ABS control unit, and the signal simulation generator is connected to the ABS control unit;
5) The corresponding switching elements in the switcher are disconnected, so that the connection between the first to fourth wheel speed sensors of the original vehicle and the ABS control unit is disconnected, and the first to fourth wheel speed signal output switches of the signal simulation generator are opened, so that the wheel speed signals of the first to fourth wheel speed signal generator are connected to the ABS control unit, and the switching elements corresponding to the communication line and the power supply line are closed;
6) Turning on an ignition switch of the tested vehicle;
7) Checking whether an ABS control unit of the tested vehicle has a fault code or not through a whole vehicle control unit diagnosis system of the signal simulation generator, and clearing the fault code for the ABS control unit if the fault code exists;
8) According to the data flow information in the whole vehicle control unit diagnosis system, respectively adjusting the wheel speed signals of the corresponding wheel speed signal generators to exceed the threshold wheel speed through the first to fourth wheel speed adjusting buttons;
9) Starting a tested vehicle, wherein wheels of the tested vehicle rotate at the moment, and the signal simulation generator transmits a wheel speed signal to the ABS control unit;
10 The brake pedal is suddenly stepped until the wheels stop rotating, the brake pedal has obvious foot flicking phenomenon, the ABS control unit of the tested vehicle works normally, and if the brake pedal is stepped, the ABS control unit of the tested vehicle does not flick, the ABS control unit of the tested vehicle works abnormally;
11 After the test is finished, the static and dynamic fault simulation analyzer of the vehicle braking system is disassembled, and the connecting wire plug and the control unit plug of the original vehicle are plugged.
In step 8), the threshold wheel speed is 30km/h.
The invention relates to a method for detecting whether four wheel speed sensors work normally by a static and dynamic fault simulation analyzer of a vehicle braking system, which comprises the following steps:
1) Starting to a maintenance station, and closing an ignition switch of the tested vehicle;
2) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
3) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original vehicle signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original vehicle sensors are respectively connected with corresponding switching elements in series to the ABS control unit, and the signal simulation generator is connected to the ABS control unit;
4) The corresponding switching elements in the switcher are conducted, so that the first to fourth wheel speed sensors of the original vehicle are connected to the ABS control unit, the first to fourth wheel speed signal output switches of the signal simulation generator are closed, the first to fourth wheel speed signal generators of the signal simulation generator are disconnected from signal output of the ABS control unit, and the switching elements corresponding to the communication line and the power supply line are closed;
5) Turning on an ignition switch of the tested vehicle;
6) The fault code of the ABS control unit and the related information of data flow are read through a full vehicle control unit diagnosis system in the signal simulation generator, and the fault of which wheel speed sensor is determined;
7) In the switcher, the corresponding switching element of the faulty wheel speed sensor is disconnected, and the corresponding wheel speed signal output switch in the signal simulation generator is started, so that the wheel speed signal of the corresponding wheel speed signal generator is connected to the ABS control unit;
8) In the signal simulation generator, the wheel speed signal generator is controlled by the corresponding wheel speed adjusting button to send out a corresponding wheel speed signal, and the wheel speed signal data flow of the detected wheel is checked by combining with a whole vehicle control unit diagnosis system, if the wheel speed signal in the whole vehicle control unit diagnosis system changes along with the change of the wheel speed output by the wheel speed signal generator, the wheel speed sensor of the detected vehicle is indicated to have a fault and needs to be replaced with a new one; if the wheel speed signal in the whole vehicle control unit diagnosis system is unchanged along with the change of the wheel speed output by the wheel speed signal generator, the fault of a wire between a wheel speed sensor of a tested vehicle and an ABS control unit is indicated, and maintenance is needed;
9) After the fault point is found, maintaining the tested vehicle;
10 After maintenance, the signal simulation generator and the switcher are removed and connected with the original plug.
The invention relates to a method for detecting whether an ABS control unit is normal by a static and dynamic fault simulation analyzer of a vehicle braking system, which comprises the following steps:
1) Connecting the generator plug to the generator input of the switch, the output of the switch being connected to the control unit plug, thereby connecting the signal simulation generator to the ABS control unit, the switching elements corresponding to the communication line and the supply line being closed;
2) Setting a wheel speed signal of a wheel speed signal generator in a signal simulation generator, wherein the wheel speed signal is set at a fixed value;
3) Setting pressure values of a first brake pedal signal generator and a second brake pedal signal generator in the signal simulation generator, wherein the pressure values of the brake pedal signal generators are set to be fixed values;
4) Reading information of an ABS control unit in a full vehicle control unit diagnosis system in a signal simulation generator;
5) If the related information of the ABS control unit can be read in the whole vehicle control unit diagnosis system in the signal simulation generator, the ABS control unit works normally and can be used for loading; if the related information of the control unit cannot be read in the whole vehicle control unit diagnosis system in the signal simulation generator, the control unit is abnormal or damaged and needs to be replaced.
Wherein in step 2), the fixed value of the wheel speed signal is above 30km/h.
In step 3), the fixed value of the pressure value is 80bar or more.
The invention relates to a using method for reading information related to a whole vehicle control unit by a vehicle braking system static and dynamic fault simulation analyzer, which comprises the following steps:
1) Closing an ignition switch of the tested vehicle;
2) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
3) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original car signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original car sensors are respectively connected in series with corresponding switching elements to the ABS control unit, and the signal simulation generator is connected to the ABS control unit, and the switching elements corresponding to the communication wires and the power supply wires are closed;
4) Turning on an ignition switch of the tested vehicle;
5) Checking related information of one or more control units of a read engine control unit, an automatic gearbox control unit, an ABS control unit, an instrument control unit and an airbag control unit of a tested vehicle through a whole vehicle control unit diagnosis system of the signal simulation generator;
6) And after the test is finished, removing the fault simulation detection analyzer of the vehicle braking system, and plugging the connecting wire plug and the control unit plug of the original vehicle.
The invention has the advantages that:
the invention adopts the signal simulation generator and the switcher, the output signal of the sensor of the original vehicle is simulated by the signal simulation generator, the output signal of the sensor of the original vehicle is selected by the switcher or the output signal of the signal simulation sensor is transmitted to the ABS control unit, and under the ABS anti-lock test mode, the ABS anti-lock test can be completed without a road test, thereby saving time and reducing the test risk; the data information of each sensor of the ABS system can be rapidly measured through the whole vehicle control unit diagnosis system, and the related information of one or more control units in the whole vehicle control unit can be read; the invention provides convenience for brake test and fault maintenance of the anti-lock brake system of the automobile.
Drawings
FIG. 1 is a block diagram of a vehicle brake system static and dynamic fault simulation analyzer of the present invention;
fig. 2 is a block diagram of a signal simulation generator of the dynamic and static fault simulation analyzer of the vehicle brake system according to the present invention.
Detailed Description
The invention will be further elucidated by means of specific embodiments in conjunction with the accompanying drawings.
As shown in fig. 1, the vehicle brake system static and dynamic fault simulation analyzer of the present embodiment includes: a signal simulation generator and a switcher; wherein, as shown in fig. 2, the signal simulation generator includes first to fourth wheel speed signal generators, first to fourth wheel speed signal adjustment buttons, first to fourth wheel speed signal output switches, first and second brake pressure signal generators, first and second brake pressure adjustment buttons and output switches, brake pedal signal output switches, all vehicle control unit diagnostic system and on-board diagnostic system OBD diagnostic port, the first to fourth wheel speed signal buttons are connected to the corresponding first to fourth wheel speed signal generators, the first to fourth wheel speed signal output switches are connected to the first to fourth wheel speed signal generators, respectively, the first and second brake pressure adjustment buttons and output switches are connected to the first and second brake pressure signal generators, respectively, the first to fourth wheel speed signal generators, the first and second brake pressure signal generators and the brake pedal signal output switches are collectively referred to as simulation sensors, each simulation sensor, the OBD diagnostic port and all vehicle control unit diagnostic system are provided on the generator plug by wires, respectively; the switcher comprises a generator input end, an original car signal input end, an output end and a group of switch elements, wherein the switch elements correspond to connecting wires, communication wires and power supply wires of the original car sensor; pulling out a control unit plug from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor; the generator plug is connected to the generator input of the switcher, the connecting wire plug is connected to the original car signal input of the switcher, the output of the switcher is connected to the control unit plug, so that each original car sensor is respectively connected in series with a corresponding switching element to the ABS control unit, and the signal simulation generator is connected to the ABS control unit. The original vehicle communication line is respectively connected in parallel to a full vehicle control unit diagnosis system and an OBD diagnosis port of the signal simulation generator through corresponding cross-connection points and measurement points in series; the power supply line is connected to the signal simulation generator through corresponding bridging points and measuring points in series, and is connected to the first to fourth wheel speed signal generators, the first and second brake pressure signal generators, the whole vehicle control unit diagnosis system and the on-board diagnosis system OBD diagnosis port in the signal simulation generator in parallel to supply power for the structures.
Example 1
The method for testing the ABS anti-lock function by the vehicle braking system static and dynamic fault simulation analyzer comprises the following steps:
1) Lifting the tested vehicle;
2) Closing an ignition switch of the tested vehicle;
3) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
4) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original vehicle signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original vehicle sensors are respectively connected with corresponding switching elements in series to the ABS control unit, and the signal simulation generator is connected to the ABS control unit;
5) The corresponding switching elements in the switcher are disconnected, so that the connection between the first to fourth wheel speed sensors of the original vehicle and the ABS control unit is disconnected, and the first to fourth wheel speed signal output switches of the signal simulation generator are opened, so that the wheel speed signals of the first to fourth wheel speed signal generator are connected to the ABS control unit, and the switching elements corresponding to the communication line and the power supply line are closed;
6) Turning on an ignition switch of the tested vehicle;
7) Checking whether an ABS control unit of the tested vehicle has a fault code or not through a whole vehicle control unit diagnosis system of the signal simulation generator, and clearing the fault code for the ABS control unit if the fault code exists;
8) According to the data flow information in the data display screen, respectively adjusting the wheel speed signals of the corresponding wheel speed signal generators to be more than 30km/h through the first to fourth wheel speed adjusting buttons;
9) Starting a tested vehicle, wherein wheels of the tested vehicle rotate at the moment, and the signal simulation generator transmits a wheel speed signal to the ABS control unit;
10 The brake pedal is suddenly stepped until the wheels stop rotating, the brake pedal has obvious foot flicking phenomenon, the ABS control unit of the tested vehicle works normally, and if the brake pedal is stepped, the ABS control unit of the tested vehicle does not flick, the ABS control unit of the tested vehicle works abnormally;
11 After the test is finished, the static and dynamic fault simulation analyzer of the vehicle braking system is disassembled, and the connecting wire plug and the control unit plug of the original vehicle are plugged.
Example two
The method for detecting whether the four wheel speed sensors work normally by the vehicle braking system static and dynamic fault simulation analyzer comprises the following steps:
1) Starting to a maintenance station, and closing an ignition switch of the tested vehicle;
2) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
3) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original car signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original car sensors are respectively connected in series with corresponding switching elements to the ABS control unit, and the signal simulation generator is connected to the ABS control unit, and the switching elements corresponding to the communication wires and the power supply wires are closed;
4) The corresponding switching elements in the switcher are conducted, so that the first to fourth wheel speed sensors of the original vehicle are connected to the ABS control unit, the first to fourth wheel speed signal output switches of the signal simulation generator are closed, and the first to fourth wheel speed signal generators of the signal simulation generator are disconnected from signal output of the ABS control unit;
5) Turning on an ignition switch of the tested vehicle;
6) The fault code of the ABS control unit and the related information of data flow are read through a full vehicle control unit diagnosis system of the signal simulation generator, and the fault of which wheel speed sensor is determined;
7) In the switcher, the corresponding switching element of the faulty wheel speed sensor is disconnected, and the corresponding wheel speed signal output switch in the signal simulation generator is started, so that the wheel speed signal of the corresponding wheel speed signal generator is connected to the ABS control unit;
8) In the signal simulation generator, the wheel speed signal generator is controlled by the corresponding wheel speed adjusting button to send out a corresponding wheel speed signal, and the wheel speed signal data flow of the detected wheel is checked by combining with a whole vehicle control unit diagnosis system, if the wheel speed signal in the whole vehicle control unit diagnosis system changes along with the change of the wheel speed output by the wheel speed signal generator, the wheel speed sensor of the detected vehicle is indicated to have a fault and needs to be replaced with a new one; if the wheel speed signal in the whole vehicle control unit diagnosis system is unchanged along with the change of the wheel speed output by the wheel speed signal generator, the fault of a wire between a wheel speed sensor of a tested vehicle and an ABS control unit is indicated, and maintenance is needed;
9) After the fault point is found, maintaining the tested vehicle;
10 After maintenance, the signal simulation generator and the switcher are removed and connected with the original plug.
Example III
The method for detecting whether the ABS control unit is normal by the vehicle braking system static and dynamic fault simulation analyzer comprises the following steps:
1) Connecting the generator plug to the generator input of the switch, the output of the switch being connected to the control unit plug, thereby connecting the signal simulation generator to the ABS control unit, the switching elements corresponding to the communication line and the supply line being closed;
2) Setting a wheel speed signal of a wheel speed signal generator in a signal simulation generator, wherein the wheel speed signal is set at 30km/h;
3) Setting pressure values of the first and second brake pedal signal generators in the signal simulation generator, wherein the pressure values are set at 80bar;
4) Reading information of an ABS control unit in a full vehicle control unit diagnosis system in a signal simulation generator;
5) If the related information of the ABS control unit can be read in the whole vehicle control unit diagnosis system in the signal simulation generator, the ABS control unit works normally and can be used for loading; if the related information of the control unit cannot be read in the whole vehicle control unit diagnosis system in the signal simulation generator, the control unit is abnormal or damaged and needs to be replaced.
Finally, it should be noted that the examples are disclosed for the purpose of aiding in the further understanding of the present invention, but those skilled in the art will appreciate that: various alternatives and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the disclosed embodiments, but rather the scope of the invention is defined by the appended claims.
Claims (6)
1. A static and dynamic fault simulation analyzer of a vehicle braking system is characterized in that a first wheel speed sensor to a fourth wheel speed sensor are respectively arranged on a left front wheel, a right front wheel, a left rear wheel and a right rear wheel of an original vehicle, a brake pedal is connected with a brake master pump through a lever, the brake master pump is connected with an ABS (anti-lock brake system) pump through a brake oil pipe, the ABS pump is respectively connected to a first ABS liquid inlet and outlet electromagnetic valve to a fourth ABS liquid inlet and outlet electromagnetic valve, the first ABS liquid inlet and outlet electromagnetic valve to the fourth ABS liquid outlet electromagnetic valve is respectively connected to a brake cylinder on the four wheels through a brake oil pipe, a first brake pressure sensor and a second brake pressure sensor are respectively arranged on the brake cylinders of the left front wheel and the right front wheel of the two front wheels, so that the brake pressure is detected, and a brake pedal signal switch is arranged behind the brake pedal; first to fourth wheel speed sensors, first and second brake pressure sensors, and a brake pedal signal switch, collectively referred to as an original vehicle sensor; the ABS control unit is internally connected with an ABS pump, an ABS electromagnetic valve relay and first to fourth ABS liquid inlet and outlet electromagnetic valves, the ABS electromagnetic valve relay is connected to the ABS pump, and the ABS pump is respectively connected to the first to fourth ABS liquid inlet and outlet electromagnetic valves; the ABS pump, the ABS electromagnetic valve relay and the first to fourth ABS liquid inlet and outlet electromagnetic valves are collectively called as an original vehicle actuator; the wheel speed sensor transmits a wheel speed signal to the ABS control unit, if the wheel speed of a wheel exceeds a threshold speed per hour, and a brake pedal is stepped on, the brake pressure sensor transmits a brake pressure signal to the ABS control unit, when the brake pedal is stepped on suddenly, a brake pedal signal switch transmits a brake pedal signal to the ABS control unit, the ABS control unit sends an emergency brake signal after receiving the brake pedal signal, the ABS control unit controls an ABS electromagnetic valve relay to be attracted, an ABS pump works, and the first to fourth ABS liquid inlet and outlet electromagnetic valves are controlled to control the brake cylinder on four wheels to work so as to realize a point brake effect; connecting wires of the original car sensors correspond to connecting wires of the ABS control unit; connecting wires of each original car sensor are arranged on a connecting wire plug, connecting wires of the ABS control unit are arranged on a control unit plug, and the connecting wire plug is connected with the control unit plug, so that each original car sensor is connected to the ABS control unit of the original car, and the fault simulation analyzer is characterized by comprising: a signal simulation generator and a switcher; the signal simulation generator comprises first to fourth wheel speed signal generators, first to fourth wheel speed adjusting buttons, first to fourth wheel speed signal output switches, first to second brake pressure signal generators, first and second brake pressure adjusting buttons and output switches, a brake pedal signal output switch, a full vehicle control unit diagnosis system and an on-board diagnosis system OBD diagnosis port, wherein the first to fourth wheel speed adjusting buttons are respectively connected with the corresponding first to fourth wheel speed signal generators, the first to fourth wheel speed signal output switches are respectively connected with the first to fourth wheel speed signal generators, the first and second brake pressure adjusting buttons and the output switches are respectively connected with the first and second brake pressure signal generators, the first to fourth wheel speed signal generators, the first and second brake pressure signal generators and the brake pedal signal output switch are collectively called simulation sensors, and each simulation sensor, the OBD diagnosis port and the full vehicle control unit diagnosis system are respectively arranged on the generator plug through wires; the switcher comprises a generator input end, an original car signal input end, an output end and a group of switch elements, wherein the switch elements correspond to connecting wires, communication wires and power supply wires of the original car sensor; pulling out a control unit plug from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor; the generator plug is connected to the generator input end of the switcher, the connecting wire plug is connected to the original car signal input end of the switcher, the output end of the switcher is connected to the control unit plug, so that each original car sensor is respectively connected in series with a corresponding switching element to the ABS control unit, the original car communication wire is respectively connected in parallel with the whole car control unit diagnosis system and the OBD diagnosis port of the signal simulation generator through the corresponding switching element in series, the power supply wire is connected to the signal simulation generator through the corresponding switching element in series, and the signal simulation generator is connected to the ABS control unit; the switching elements corresponding to the communication lines and the power supply lines are closed, one or more of the original vehicle sensors are selected to be disconnected with the ABS control unit, and the corresponding switching elements are disconnected, so that the selected original vehicle sensors are disconnected with the ABS control unit, and meanwhile, the signal output switches of the corresponding analog sensors are opened, so that the signal analog generator outputs one or more of corresponding wheel speed signals, brake pressure signals and brake pedal signals to the ABS control unit; the corresponding wheel speed signal generator is controlled by the wheel speed adjusting button to generate a corresponding wheel speed signal to be transmitted to the ABS control unit, the brake pressure signal generator is adjusted by the brake pressure adjusting button and the output switch to send a brake pressure signal to the ABS control unit, the brake pedal signal is controlled by the brake pedal signal output switch to output a brake pedal signal, information in the whole vehicle control unit diagnosis system is used, if the wheel speed signal received by the ABS control unit exceeds a threshold time speed and the brake pressure signal is received, the ABS control unit sends an emergency brake signal after receiving the brake pedal signal to control the ABS electromagnetic valve relay to be attracted, the ABS pump works, and the brake sub pumps on the four wheels are controlled by the first to fourth ABS liquid inlet and outlet electromagnetic valves to work to realize a point brake effect.
2. The fault simulation analyzer of claim 1, wherein the first through fourth wheel speed signal generators, the first through fourth wheel speed adjustment buttons, the first through fourth wheel speed signal output switches, the first and second brake pressure signal generators, the first and second brake pressure adjustment buttons and output switches, the brake pedal signal output, the all-vehicle control unit diagnostic system, and the OBD diagnostic port switch are all disposed on a circuit board, the circuit board being disposed within the housing.
3. The fault simulation analyzer of claim 1, wherein the all-vehicle control unit diagnostic system includes a diagnostic display screen and a diagnostic operating button, the diagnostic operating button being connected to the diagnostic display screen, the communication line being connected to the diagnostic display screen.
4. The fault simulation analyzer of claim 1, wherein the switching element of the switcher employs a switch or a crossover point and a crossover plug.
5. The fault simulation analyzer of claim 1, wherein the switch further comprises a housing, the generator input, the raw signal input and the output are disposed on the housing, respectively, and a set of switching elements is disposed within the housing.
6. The method for detecting a static and dynamic fault simulation analyzer of a vehicle brake system according to claim 1, wherein the method for detecting an ABS function, the method for detecting whether four wheel speed sensors are operating normally, the method for detecting whether an ABS control unit is operating normally, and the method for reading information about a whole vehicle control unit are provided, the method for detecting an ABS function comprising the steps of:
1) Lifting the tested vehicle;
2) Closing an ignition switch of the tested vehicle;
3) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
4) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original vehicle signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original vehicle sensors are respectively connected with corresponding switching elements in series to the ABS control unit, and the signal simulation generator is connected to the ABS control unit;
5) The corresponding switching elements in the switcher are disconnected, so that the connection between the first to fourth wheel speed sensors of the original vehicle and the ABS control unit is disconnected, and the first to fourth wheel speed signal output switches of the signal simulation generator are opened, so that the wheel speed signals of the first to fourth wheel speed signal generator are connected to the ABS control unit, and the switching elements corresponding to the communication line and the power supply line are closed;
6) Turning on an ignition switch of the tested vehicle;
7) Checking whether an ABS control unit of the tested vehicle has a fault code or not through a whole vehicle control unit diagnosis system of the signal simulation generator, and clearing the fault code for the ABS control unit if the fault code exists;
8) According to the data flow information in the whole vehicle control unit diagnosis system, respectively adjusting the wheel speed signals of the corresponding wheel speed signal generators to exceed the threshold wheel speed through the first to fourth wheel speed adjusting buttons;
9) Starting a tested vehicle, wherein wheels of the tested vehicle rotate at the moment, and the signal simulation generator transmits a wheel speed signal to the ABS control unit;
10 The brake pedal is suddenly stepped until the wheels stop rotating, the brake pedal has obvious foot flicking phenomenon, the ABS control unit of the tested vehicle works normally, and if the brake pedal is stepped, the ABS control unit of the tested vehicle does not flick, the ABS control unit of the tested vehicle works abnormally;
11 After the test is finished, removing the static and dynamic fault simulation analyzer of the vehicle braking system, and plugging the connecting wire plug and the control unit plug of the original vehicle;
the method for detecting whether the four wheel speed sensors work normally comprises the following steps:
1) Starting to a maintenance station, and closing an ignition switch of the tested vehicle;
2) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
3) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original vehicle signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original vehicle sensors are respectively connected with corresponding switching elements in series to the ABS control unit, and the signal simulation generator is connected to the ABS control unit;
4) The corresponding switching elements in the switcher are conducted, so that the first to fourth wheel speed sensors of the original vehicle are connected to the ABS control unit, the first to fourth wheel speed signal output switches of the signal simulation generator are closed, the first to fourth wheel speed signal generators of the signal simulation generator are disconnected from signal output of the ABS control unit, and the switching elements corresponding to the communication line and the power supply line are closed;
5) Turning on an ignition switch of the tested vehicle;
6) The fault code of the ABS control unit and the related information of data flow are read through a full vehicle control unit diagnosis system in the signal simulation generator, and the fault of which wheel speed sensor is determined;
7) In the switcher, the corresponding switching element of the faulty wheel speed sensor is disconnected, and the corresponding wheel speed signal output switch in the signal simulation generator is started, so that the wheel speed signal of the corresponding wheel speed signal generator is connected to the ABS control unit;
8) In the signal simulation generator, the wheel speed signal generator is controlled by the corresponding wheel speed adjusting button to send out a corresponding wheel speed signal, and the wheel speed signal data flow of the detected wheel is checked by combining with a whole vehicle control unit diagnosis system, if the wheel speed signal in the whole vehicle control unit diagnosis system changes along with the change of the wheel speed output by the wheel speed signal generator, the wheel speed sensor of the detected vehicle is indicated to have a fault and needs to be replaced with a new one; if the wheel speed signal in the whole vehicle control unit diagnosis system is unchanged along with the change of the wheel speed output by the wheel speed signal generator, the fault of a wire between a wheel speed sensor of a tested vehicle and an ABS control unit is indicated, and maintenance is needed;
9) After the fault point is found, maintaining the tested vehicle;
10 After maintenance, the signal simulation generator and the switcher are removed and connected with the original vehicle plug;
the method for detecting whether the ABS control unit is normal comprises the following steps:
1) Connecting the generator plug to the generator input of the switch, the output of the switch being connected to the control unit plug, thereby connecting the signal simulation generator to the ABS control unit, the switching elements corresponding to the communication line and the supply line being closed;
2) Setting a wheel speed signal of a wheel speed signal generator in a signal simulation generator, wherein the wheel speed signal is set at a fixed value;
3) Setting pressure values of a first brake pedal signal generator and a second brake pedal signal generator in the signal simulation generator, wherein the pressure values of the brake pedal signal generators are set to be fixed values;
4) Reading information of an ABS control unit in a full vehicle control unit diagnosis system in a signal simulation generator;
5) If the related information of the ABS control unit can be read in the whole vehicle control unit diagnosis system in the signal simulation generator, the ABS control unit works normally and can be used for loading; if the related information of the control unit cannot be read in a full vehicle control unit diagnosis system in the signal simulation generator, the control unit is indicated to work abnormally or to be damaged and needs to be replaced;
the application method for reading the information related to the whole vehicle control unit comprises the following steps:
1) Closing an ignition switch of the tested vehicle;
2) Pulling out a control unit plug of the tested vehicle from the connecting wire plug, and disconnecting the ABS control unit from the original vehicle sensor;
3) Connecting a generator plug to the generator input end of the switcher, connecting a wire plug to the original car signal input end of the switcher, and connecting the output end of the switcher to the control unit plug, so that the original car sensors are respectively connected in series with corresponding switching elements to the ABS control unit, and the signal simulation generator is connected to the ABS control unit, and the switching elements corresponding to the communication wires and the power supply wires are closed;
4) Turning on an ignition switch of the tested vehicle;
5) Checking related information of one or more control units of a read engine control unit, an automatic gearbox control unit, an ABS control unit, an instrument control unit and an airbag control unit of a tested vehicle through a whole vehicle control unit diagnosis system of the signal simulation generator;
6) And after the test is finished, removing the fault simulation detection analyzer of the vehicle braking system, and plugging the connecting wire plug and the control unit plug of the original vehicle.
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| CN201811285285.2A CN109297726A (en) | 2018-10-31 | 2018-10-31 | A kind of quiet dynamic fault sunykatuib analysis instrument of motor vehicle braking system and its detection method |
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| CN110464962B (en) * | 2019-07-24 | 2021-09-24 | 喜临门家具股份有限公司 | Airbag control method, device, bedding airbag, electronic device, and storage medium |
| CN113917871B (en) * | 2021-10-12 | 2024-02-27 | 北京英创汇智科技有限公司 | Electronic control device suitable for real vehicle signal test |
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| CN109406171A (en) | 2019-03-01 |
| CN109297726A (en) | 2019-02-01 |
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