CN100354167C - Braking controller and its fault diagnostic method - Google Patents
Braking controller and its fault diagnostic method Download PDFInfo
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- CN100354167C CN100354167C CNB2004100850962A CN200410085096A CN100354167C CN 100354167 C CN100354167 C CN 100354167C CN B2004100850962 A CNB2004100850962 A CN B2004100850962A CN 200410085096 A CN200410085096 A CN 200410085096A CN 100354167 C CN100354167 C CN 100354167C
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- 238000002405 diagnostic procedure Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims description 59
- 230000033228 biological regulation Effects 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims description 7
- 238000011105 stabilization Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000013024 troubleshooting Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 76
- 239000010727 cylinder oil Substances 0.000 abstract description 11
- 238000003745 diagnosis Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000002828 fuel tank Substances 0.000 description 5
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- 238000004364 calculation method Methods 0.000 description 2
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Abstract
The present invention provides a braking controller and a failure diagnosis method thereof for exactly and rapidly detecting failures, such as leakage, etc. When a car is stopped stably, object braking oil pressure Pt and wheel braking cylinder oil pressure Pwc <**> are compared (S208) under the condition that the object braking oil pressure Pt is kept in a definite state (S200, S202, S204). Afterwards, when the state that the absolute value of the difference value of the object braking oil pressure Pt and the wheel braking cylinder oil pressure Pwc<**> is larger than a specified value P is detected by the method continuously for specified times, failures are judged (S216).
Description
Technical field
The present invention relates to a kind of vehicle braked control setup and method for diagnosing faults thereof.
Background technology
Open in the 2000-168536 communique the spy, put down in writing the technology that in the vehicle braked process, detects the leakage of wheel brake cylinder.According to this technology, when the absolute value of the difference that satisfies the left and right wheels brake cylinder internal pressure on left and right sides front-wheel or the left and right sides trailing wheel simultaneously greater than specified value, and, the absolute value of the difference of wheel braking in-cylinder pressure and expected value is greater than specified value, and during the condition of pressure sensor normal operation, will be judged as the leakage of wheel braking cylinder will take place.
Summary of the invention
But, above-mentioned expected value in the car brakeing process with change.In addition, when the hydraulic pressure that waits in owing to the wheel braking cylinder makes expected value change along with response lag changes, need consider this response lag.So, be difficult to accurately promptly detect a spot of leakage.
The present invention has promptly done for addressing the above problem, and its purpose is, provide a kind of can be accurately and promptly detect the braking force control system and the method for diagnosing faults thereof of faults such as leakage.
The braking force control system that the present invention relates to is characterized in that, has: judge whether vehicle is the decision maker that stops of stablizing halted state; Output indication based on the serviceability of brake operating portion require the 1st control signal of brake fluid pressure the time, when when stopping decision maker and be judged to be halted state, the control setup of the 2nd control signal of output indicating target brake fluid pressure; According to the hydraulic control device of regulating brake fluid pressure by the 1st control signal or the 2nd control signal of control setup output; And when exporting the 2nd control signal of indicating target brake fluid pressure,, carry out the trouble-shooter of the trouble diagnosing of hydraulic control device by target brake fluid pressure and actual brake fluid pressure are compared.
The method for diagnosing faults that the present invention relates to is characterized in that, has: judge whether vehicle is the determination step that stops of stablizing halted state; Output indication based on the serviceability of brake operating portion require the 1st control signal of brake fluid pressure the time, when in stopping determination step, being judged to be halted state, the controlled step of the 2nd control signal of output indicating target brake fluid pressure; The fluid control step of the hydraulic control device that the 1st control signal that the driving basis is exported in controlled step or the 2nd control signal are regulated brake fluid pressure; And when exporting the 2nd control signal of indicating target brake fluid pressure,, carry out the troubleshooting step of the trouble diagnosing of hydraulic control device by target brake fluid pressure and actual brake fluid pressure are compared.
According to braking force control system that the present invention relates to or method for diagnosing faults, when vehicle stabilization stops, by target brake fluid pressure and actual brake fluid pressure are compared the trouble diagnosing that carries out hydraulic control device.In this case, because the target brake fluid pressure that trouble diagnosing is used promptly, is judged to be the target brake fluid pressure a reference value use as a comparison that sets when stablize halted state, so can be accurately and promptly detect the fault of hydraulic control device.
In addition, in the braking force control system that the present invention relates to, stop decision maker, be under zero the situation in the speed of a motor vehicle, portion is operated when brake operating, brake fluid pressure and when being applied to pedal force in the brake operating portion at least wherein few arbitrary condition more than specified value and setting up, is suitable for judging that vehicle stabilization stops more than specified value.
In the method for diagnosing faults that the present invention relates to, preferably in stopping determination step, be under zero the situation in the speed of a motor vehicle, portion is operated when brake operating, brake fluid pressure is more than specified value, and when being applied to pedal force in the brake operating portion at least wherein arbitrary condition more than specified value and setting up, will judge that vehicle stabilization stops.
Like this, when under the state of additional brake power, when vehicle is stopped, will judging that vehicle stops for stable by driver's operation brake operating portion.Therefore, can judge really whether vehicle stops.
In addition, in the braking force control system that the present invention relates to, preferably when the operation removed brake operating portion, control setup will stop exporting the control signal of indicating target hydraulic pressure.
In addition, in the method for diagnosing faults that the present invention relates to, preferably in controlled step, when the operation removed brake operating portion, stop the 2nd control signal that output is used to indicate target hydraulic.
Like this, can be along with the termination of chaufeur braking maneuver, on one side the braking force of additional regulation, stop the trouble diagnosing of the hydraulic control device implemented on one side.
In addition, the braking force control system that the present invention relates to, selected objective target brake fluid pressure be requirement brake fluid pressure and regulation stop little one of value in the hydraulic pressure.
In the method for diagnosing faults that the present invention relates to, the selected objective target brake fluid pressure is that requirement brake fluid pressure and regulation stop little one of value in the hydraulic pressure.
In this case, be set to the target brake fluid pressure owing to require brake fluid pressure and regulation to stop little one of value in the hydraulic pressure, so, can stop vehicle by less hydraulic pressure, in addition, can also carry out trouble diagnosing by less hydraulic pressure.Thus, can suppress to produce useless hydraulic pressure.
In addition, in the braking force control system that the present invention relates to, control signal is a current value, preferably with the cooresponding current value of target brake fluid pressure, be with require the cooresponding current value of brake fluid pressure and with stop little one of value in the cooresponding current value of hydraulic pressure.
In the method for diagnosing faults that the present invention relates to, the 1st control signal and the 2nd control signal are current value, preferably with the cooresponding current value of target brake fluid pressure, be with require the cooresponding current value of brake fluid pressure and with stop little one of value in the cooresponding current value of hydraulic pressure.
In this case, vehicle stops and trouble diagnosing owing to being undertaken by less current, thereby can reduce the current value of energising.Thus, can make to consume electric power and cal val reduction, thereby can improve the durability of hydraulic control device.
Description of drawings
Fig. 1 is the figure in the oil brake loop of the braking force control system that relates to of expression the 2nd embodiment.
Fig. 2 is the block scheme of the ECU function of the braking force control system that relates to of expression the 2nd embodiment.
Fig. 3 is the diagram of circuit of the control of braking of the vehicle of the braking force control system that is used for illustrating that the 2nd embodiment relates to when stopping.
Fig. 4 is the diagram of circuit that the system test of the braking force control system that is used for illustrating that the 2nd embodiment relates to is handled.
Fig. 5 is the integrally-built block scheme of the braking force control system that relates to of expression the 1st embodiment.
Fig. 6 is the diagram of circuit of the handler handled of the system test in the braking force control system that relates to of expression the 1st embodiment.
The specific embodiment
Below, the embodiment that present invention will be described in detail with reference to the accompanying.In addition, in description of drawings,, and omit repeat specification to the identical label of components identical mark.
(the 1st embodiment)
Utilize Fig. 5, the integral structure of the electron steering brake equipment (braking force control system) 1 that the 1st embodiment is related to describes.Fig. 5 is the integrally-built block scheme of expression electron steering brake equipment 1.
Electron steering brake equipment 1, have that serviceability according to brake pedal (brake operating portion) 10 waits the electronic control package of exporting control signal (below be called " ECU ") 60 and according to the brake actuator 8 of regulating the braking oil pressure in wheel braking cylinder 48FL～48RR from the control signal of ECU 60.Brake actuator 8 plays a role as hydraulic control device.
In addition, ECU 60, and when judging that whether vehicle is when stablize halted state and being judged to be halted state, the 2nd control signal of the target braking oil pressure of the system test (trouble diagnosing) that is used to carry out brake actuator 8 is indicated in output.In addition, ECU 60 diagnoses whether et out of order of brake actuator 8 by target braking oil pressure and actual braking oil pressure are compared.That is, ECU60 is as stopping judgment means, control setup and trouble-shooter and play a role.
Below, with reference to Fig. 6, the action of electron steering brake equipment 1 and the system test method (method for diagnosing faults) of electron steering brake equipment 1 are described.Fig. 6 is the diagram of circuit of the handler of the system test processing in the expression electron steering brake equipment 1.This system test is handled, and in ECU 60, carries out repeatedly every specified time.
In step S300, carry out whether stablizing the judgement that stops about vehicle.At this, when judging that vehicle does not have stable stopping, will temporarily withdrawing from processing, and, carry out this step once more through behind the specified time.On the other hand, when judging that vehicle stabilization stops, entering step S302 and handle.
In step S302, the target braking oil pressure Pt of initialization system check usefulness.Next, in step S304, read in the wheel braking cylinder oil pressure Pwc of wheel braking cylinder 48FL～48RR
*(
*Refer to FL, FR, RL, RR).
In following step S306, judge target braking oil pressure Pt and actual wheel brake cylinder oil pressure Pwc
*Difference absolute value whether (for example, 0.5MPa) greater than specified value P.
At this, as target braking oil pressure Pt and actual wheel brake cylinder oil pressure Pwc
*Difference in specialized range the time, will judge that the oil brake loop is a normal operation, and withdraw from processing.On the other hand, as target braking oil pressure Pt and actual wheel brake cylinder oil pressure Pwc
*The absolute value of difference during greater than the afore mentioned rules value, will be judged as fault (failure).
(the 2nd embodiment)
Below, utilizing Fig. 1 and Fig. 2 simultaneously, the integral structure of the electron steering brake equipment 2 that the 2nd embodiment is related to describes.Fig. 1 is the figure in the oil brake loop of expression electron steering brake equipment 2.In addition, Fig. 2 is the block scheme that constitutes the ECU 60 of electron steering brake equipment 2.In addition, in Fig. 1,2, to composed component mark same numeral identical with the 1st embodiment or that be equal to.
Electron steering brake equipment 2 has the response chaufeur brake pedal 10 is stepped on into operation and the master cylinders 14 of force feed work fluid.In addition, on brake pedal 10, be provided with detect brake pedal 10 step on input, the i.e. stroke sensor 12 of pedal stroke.
On master cylinders 14, the simulator transfer valve 16 by closed type is connected with stroke simulator 18.In addition, between the main transfer valve 20,22 of master cylinders 14 and open type, be provided with the primary pressure sensor 24,26 of the pressure that is used to detect master cylinders 14.
The end that oil pressure supplying duct 30 and oil pressure are discharged conduit 32 is connected on the fuel tank 28.In the middle of oil pressure supplying duct 30, be provided with the pump 36 that drives by motor 34, be provided with storage simultaneously and rotate the accumulator 38 of the oil pressure that raises by making pump 36.In addition, in the middle of oil pressure supplying duct 30, be provided with the accumulator pressure sensor 40 of the pressure that is used to detect accumulator 38.In addition, between oil pressure supplying duct 30 and fuel tank 28, be provided with when the pressure in the oil pressure supplying duct 30 raises, be used for work fluid is back to the by pass valve 44 of fuel tank 28.
The other end of oil pressure supplying duct 30, the oil pressure supplying duct 46FL that uses by the near front wheel is connected on the wheel braking cylinder 48FL of the near front wheel, and is connected to by the oil pressure supplying duct 46FR that off front wheel is used on the wheel braking cylinder 48FR of off front wheel.In addition, the other end of oil pressure supplying duct 30, the oil pressure supplying duct 46RL that uses by left rear wheel is connected on the wheel braking cylinder 48RL of left rear wheel, and is connected to by the oil pressure supplying duct 46RR that off hind wheel is used on the wheel braking cylinder 48RR of off hind wheel.
Equally, oil pressure is discharged the other end of conduit 32, and the oil pressure discharge conduit 50FL that uses by the near front wheel is connected on the wheel braking cylinder 48FL of the near front wheel, and is connected on the wheel braking cylinder 48FR of off front wheel by the oil pressure discharge conduit 50FR that off front wheel is used.In addition, oil pressure is discharged the other end of conduit 32, and the oil pressure discharge conduit 50RL that uses by left rear wheel is connected on the wheel braking cylinder 48RL of left rear wheel, and is connected on the wheel braking cylinder 48RR of off hind wheel by the oil pressure discharge conduit 50RR that off hind wheel is used.
Between oil pressure supplying duct 30 and oil pressure supplying duct 46FL, 46FR, 46RL and 46RR, be respectively equipped with flow control electromagnetic valve 52FL, 52FR, 52RL and 52RR.In addition, between oil pressure discharge conduit 32 and oil pressure discharge conduit 50FL, 50FR, 50RL and 50RR, be respectively equipped with flow control electromagnetic valve 54FL, 54FR, 54RL and 54RR.In addition, be provided with pressure sensor 56FL, 56FR, 56RL and the 56RR of the pressure that is used for detecting respectively wheel brake cylinder 48FL, 48FR, 48RL and 48RR.In addition, on flow control electromagnetic valve 52FL～52RR, 54FL～54RR, for example, adopt linear solenoid valve.
In addition, as shown in Figure 2, with the signal of expression by the pressure in the master cylinders 14 of primary pressure sensor 24,26 outputs, expression is by the signal of the pressure of the accumulator 38 of accumulator pressure sensor 40 outputs, expression is by the signal of the pressure in the wheel braking cylinder 48FL～48RR of pressure sensor 56FL～56RR output, expression is by the input of stepping on of the brake pedal of stroke sensor 12 output, be the signal of pedal stroke, and input to ECU 60 according to the signal that wheel velocity produces by vehicle-wheel speed sensor 62.In addition, on ECU 60, be connected with when brake pedal 10 is stepped on into and the brake switch of opening 64.
On the other hand, 60 pairs of simulator transfer valves 16 of ECU, main transfer valve 20,22, flow control electromagnetic valve 52FL～52RR, 54FL～54RR, and motor 34 output control signals.
Then, according to above-mentioned formation, in ECU 60 inside, construct out the judgement vehicle and whether be stablize halted state stop detection unit 60a, the control part 60b of output and the cooresponding control signal of target braking oil pressure (target brake fluid pressure) and the 60c of trouble diagnosing portion by target braking oil pressure and wheel braking cylinder oil pressure being carried out trouble diagnosing etc.That is, ECU 60 is as stopping decision maker, control setup and trouble-shooter and play a role.
Below, with reference to Fig. 3 and Fig. 4 the action of electron steering brake equipment 2 and the system test method of electron steering brake equipment 2 are described.Fig. 3 is the diagram of circuit of the control of braking of the vehicle in the expression electron steering brake equipment 2 when stopping.In addition, Fig. 4 is the diagram of circuit of the detailed content of the system test processing in the presentation graphs 3.
At step S100,, carry out the judgement whether vehicle is in halted state by according to the speed of a motor vehicle of calculating by the wheel velocity signal of vehicle-wheel speed sensor 62 inputs.At this, when judging that vehicle is not in halted state, will temporarily withdraw from processing, and stop to judge through carrying out vehicle behind the specified time once more in this step.On the other hand, when judging that the speed of a motor vehicle is 0km/h, when vehicle is in halted state, enters step S102 and handle.
At step S102, calculate the desired braking oil pressure that requires of chaufeur.This requires braking oil pressure, and according to by the pedal stroke of stroke sensor 12 detected brake pedals with by the pressure of primary pressure sensor 24,26 detected master cylinderses 14, promptly the braking pedal force of chaufeur calculates.
Particularly, in the ROM of ECU 60, store predetermined pedal stroke, master cylinders pressure and require the conversion figure (requiring braking oil pressure conversion figure) of the relation of braking oil pressure, require braking oil pressure conversion figure by retrieving this, obtain the desired braking oil pressure that requires of chaufeur according to pedal stroke and master cylinders pressure.
At following step S104, calculate the target braking oil pressure.Particularly, the require braking oil pressure and the default upper limit oil pressure (stopping hydraulic pressure, for example 4MPa) of calculating in step S102 compared, one that value is less is set at the target braking oil pressure.At this, as upper limit oil pressure, which kind of state no matter setting be in can stop the vehicle braked oil pressure really.
Then,, calculate the target current value according to the target braking oil pressure of in step S104, calculating at step S106.At this, in the ROM of ECU 60, the conversion figure of the relation of store predetermined target braking oil pressure and target current value (target current value transform figure) by according to the target braking oil pressure, retrieves this target current value transform figure, obtains the target current value.
In addition, can with above-mentioned requirements braking oil pressure conversion figure as regulation pedal stroke, master cylinders pressure and with the conversion figure of the relation that requires the corresponding current value of braking oil pressure, also can be with the data of above-mentioned upper limit oil pressure as current value.In this case, to require the cooresponding current value of braking oil pressure and compare with the cooresponding current value of upper limit oil pressure, and will be worth less one and be set at the target current value.
At step S108,, drive flow control electromagnetic valve 52FL～52RR according to the target current value of in step S106, calculating.When driving flow control electromagnetic valve 52FL～52RR, so that control by the actual current value of the flow control electromagnetic valve 52FL～52RR mode consistent with the target current value.At this moment, flow control electromagnetic valve 54FL～54RR is closed, and the connection of wheel braking cylinder 48FL～48RR and fuel tank 28 is cut off.
Owing to by carrying out above-mentioned control of braking, can vehicle be stopped, consuming electric power and cal val so can reduce, thereby can improve the durability in oil brake loop by less current.
At step S110, the system test (trouble diagnosing) in the oil brake loop that whether can implement to constitute electron steering brake equipment 1 is judged.At this, for example, be in halted state when satisfying vehicle simultaneously, and chaufeur is stepped on the moving pedal of system, and, wheel brake cylinder pressure more than the specified value and its pressure variation in specified value, and the pressure variation of master cylinders pressure is at specified value during with interior condition (but implementation condition), but is judged as the implementation system check.In addition, when vehicle is in halted state, when satisfying one of them of other 3 conditions at least, but also can be judged as the implementation system check.
At this, but when satisfying the implementation condition of system test, that is, under the state of stepping on the moving pedal of system at chaufeur, vehicle stops really, and during the pressure stability of wheel braking cylinder etc., moves to and handle among the step S112, the implementation system check.On the other hand,, do not implement system test, and withdraw from processing can implementation condition the time when discontented.
At step S112, the implementation system check.At this, check according to the method implementation system shown in the diagram of circuit of Fig. 4.Below, with reference to Fig. 4 the detailed content of this system test is described.
At step S200, default define objective braking oil pressure (for example, 4MPa) is set at the target braking oil pressure Pt that system test is used.At this, Pt also can adopt the target braking oil pressure of calculating in step S104 as this target braking oil pressure.In addition, the target braking oil pressure Pt of She Dinging will be held when implementation system is checked in this step.
At following step S202, the target braking oil pressure Pt according to setting in step S200 calculates target current value It.In addition, because the calculation method of target current value It and the calculation method of the target current value among the above-mentioned steps S106 be equal to, so in this description will be omitted.
Then at step S204,54FL～54RR is closed at the flow control electromagnetic valve, and the connection that makes wheel braking cylinder 48FL～48RR and fuel tank 28 is when being cut off, according to the target current value of in step S202, calculating, drive flow control electromagnetic valve 52FL～52RR, increase the pressure of wheel braking cylinder 48FL～48RR.
Then, when, being stopped to flow control electromagnetic valve 52FL～52RR energising when consistent and stable with target braking oil pressure Pt by the pressure of the detected wheel braking cylinder of pressure sensor 56FL～56RR 48FL～48RR, each control cock is closed.Thus, the pressure in wheel braking cylinder 48FL～48RR is maintained at target braking oil pressure Pt.
At step S206, read in wheel braking cylinder oil pressure Pwc by the wheel braking cylinder 48FL～48RR of pressure sensor 56FL～56RR input
*(
*Refer to FL, FR, RL, RR).
Then, at following step S208, judge target braking oil pressure Pt and actual wheel brake cylinder oil pressure Pwc
*Difference absolute value whether (for example, 0.5MPa) greater than specified value P.
At this, when step S208 when negating, that is, and as target braking oil pressure Pt and actual wheel braking cylinder oil pressure Pwc
*Difference in specialized range the time, judge that the oil brake loop is a normal operation, in step S210, failure counter Cf is set at 0 after, withdraw from processing.
On the other hand, as target braking oil pressure Pt and actual wheel braking cylinder oil pressure Pwc
*The absolute value of difference during greater than afore mentioned rules value P, will be judged as fault (failure), at step S212, failure counter Cf counting is over.At this, as mentioned above, the pressure in the wheel braking cylinder 48FL～48RR during owing to beginning system test is consistent with target braking oil pressure Pt, and this target braking oil pressure not change in the system test process, even, also can detect really so small oil pressure leaks.
In following step S214, whether failure judgement counting machine Cf is greater than specified value F.At this, when failure counter Cf when specified value is following, that is, do not reach stipulated number as yet as failure counter Cf and count when being over, indeterminate fault and temporarily withdraw from processing.
On the other hand, as failure counter Cf during, that is, when failure counter Cf reaches the stipulated number counting and is over, will be defined as fault at step S216 greater than specified value F.Thus, can prevent the flase drop of the fault that causes by noise etc.
Though more than embodiments of the present invention are illustrated, the present invention is not limited to above-mentioned embodiment, can also carry out various distortion.For example, in the present embodiment, though used linear solenoid valve as flow control electromagnetic valve 52FL～52RR, 54FL～54RR, also can the usage load electromagnetic solenoid etc.
In addition, the structure of brake actuator 8 shown in Figure 1 is an example wherein just, and the structure of brake actuator 8 also is not limited to this.
According to the present invention, owing to be when vehicle stabilization stops, the target brake fluid pressure is being kept under certain state, the trouble diagnosing that carries out hydraulic brake system by comparison object brake fluid pressure and actual brake fluid pressure constitutes, so can be accurately and promptly detect fault such as leakage.
Claims (10)
1. braking force control system is characterized in that having:
Judge whether vehicle is the decision maker that stops of stablizing halted state;
Output indication based on the serviceability of brake operating portion require the 1st control signal of brake fluid pressure the time, when by described when stopping decision maker and being judged to be halted state, the control setup of the 2nd control signal of output indicating target brake fluid pressure;
According to the hydraulic control device of regulating brake fluid pressure by described the 1st control signal or the 2nd control signal of described control setup output; And
When described the 2nd control signal of the described target brake fluid pressure of output indication,, carry out the trouble-shooter of the trouble diagnosing of described hydraulic brake system by described target brake fluid pressure and actual brake fluid pressure are compared.
2. braking force control system as claimed in claim 1 is characterized in that,
The described decision maker that stops, be under zero the situation in the speed of described vehicle, when described brake operating portion is operated, brake fluid pressure is more than specified value, and at least wherein arbitrary condition of pedal force more than specified value in the described brake operating portion of being applied to is judged to be described vehicle stabilization and stops when setting up.
3. braking force control system as claimed in claim 1 or 2 is characterized in that,
Described control setup when the operation removed described brake operating portion, stops the control signal of the described target brake fluid pressure of output indication.
4. braking force control system as claimed in claim 1 is characterized in that,
Described target brake fluid pressure, be described require brake fluid pressure and regulation stop little one of value in the hydraulic pressure.
5. braking force control system as claimed in claim 4 is characterized in that,
Described control signal is a current value;
With the cooresponding current value of described target brake fluid pressure, be to require the cooresponding current value of brake fluid pressure and stop little one of value in the cooresponding current value of hydraulic pressure with described with described.
6. method for diagnosing faults is characterized in that having:
Judge whether vehicle is the determination step that stops of stablizing halted state;
Output indication based on the serviceability of brake operating portion require the 1st control signal of brake fluid pressure the time, when described when stopping to be judged to be halted state in the determination step, the controlled step of the 2nd control signal of output indicating target brake fluid pressure;
The hydraulic braking step of the hydraulic brake system that described the 1st control signal that the driving basis is exported in described controlled step or the 2nd control signal are regulated brake fluid pressure; And
When described the 2nd control signal of the described target brake fluid pressure of output indication,, carry out the troubleshooting step of the trouble diagnosing of described hydraulic brake system by described target brake fluid pressure and actual brake fluid pressure are compared.
7. method for diagnosing faults as claimed in claim 6 is characterized in that,
Stop in the determination step described, be under zero the situation in the speed of described vehicle, when described brake operating portion is operated, brake fluid pressure is more than the specified value and when being applied to that at least one condition is set up in the condition of pedal force more than specified value in the described brake operating portion, judge that described vehicle stabilization stops.
8. as claim 6 or 7 described method for diagnosing faults, it is characterized in that,
In described controlled step, when the operation removed described brake operating portion, stop described the 2nd control signal of the described target brake fluid pressure of output indication.
9. method for diagnosing faults as claimed in claim 6 is characterized in that,
Described target brake fluid pressure be described require brake fluid pressure and regulation stop little one of value in the hydraulic pressure.
10. method for diagnosing faults as claimed in claim 9 is characterized in that,
Described the 1st control signal and the 2nd control signal are current values;
With the cooresponding current value of described target brake fluid pressure, be to require the cooresponding current value of brake fluid pressure and stop little one of value in the cooresponding current value of hydraulic pressure with described with described.
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| CNB2004100850962A CN100354167C (en) | 2004-10-12 | 2004-10-12 | Braking controller and its fault diagnostic method |
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| CNB2004100850962A CN100354167C (en) | 2004-10-12 | 2004-10-12 | Braking controller and its fault diagnostic method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823482A (en) * | 2010-05-28 | 2010-09-08 | 冯兵 | Diagnosis system for vehicle braking system and diagnosis method |
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| CN108549360A (en) * | 2018-03-30 | 2018-09-18 | 北京长城华冠汽车技术开发有限公司 | Vehicle failure local diagnostic method and diagnostic system |
| CN113815424B (en) * | 2020-06-19 | 2023-09-22 | 广州汽车集团股份有限公司 | Vehicle braking force control method, device and computer readable storage medium |
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| DE3220145A1 (en) * | 1982-05-28 | 1983-12-01 | Alfred Teves Gmbh, 6000 Frankfurt | Dual circuit pressure governor |
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| CN2289714Y (en) * | 1997-03-15 | 1998-09-02 | 金荣昌 | Vehicle hydraulic braking safety device |
-
2004
- 2004-10-12 CN CNB2004100850962A patent/CN100354167C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3691522A (en) * | 1971-06-07 | 1972-09-12 | Colman Benjamin W | Early warning brake fault system |
| US3917355A (en) * | 1974-04-17 | 1975-11-04 | Nisshin Kogyo Kk | Fluid pressure control device with a failure alarm for a vehicle brake system |
| DE3220145A1 (en) * | 1982-05-28 | 1983-12-01 | Alfred Teves Gmbh, 6000 Frankfurt | Dual circuit pressure governor |
| US4914916A (en) * | 1988-04-04 | 1990-04-10 | Automotive Products Plc | Tandem master cylinder with electromagnetic position sensors for each piston |
| CN2289714Y (en) * | 1997-03-15 | 1998-09-02 | 金荣昌 | Vehicle hydraulic braking safety device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823482A (en) * | 2010-05-28 | 2010-09-08 | 冯兵 | Diagnosis system for vehicle braking system and diagnosis method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1760069A (en) | 2006-04-19 |
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