CN109878485A - Electric car service brake force aid system and its control strategy and method for diagnosing faults - Google Patents
Electric car service brake force aid system and its control strategy and method for diagnosing faults Download PDFInfo
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- CN109878485A CN109878485A CN201910267310.2A CN201910267310A CN109878485A CN 109878485 A CN109878485 A CN 109878485A CN 201910267310 A CN201910267310 A CN 201910267310A CN 109878485 A CN109878485 A CN 109878485A
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- relay
- pressure sensor
- failure
- electric
- vacuum
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- 238000011217 control strategy Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000003745 diagnosis Methods 0.000 claims description 24
- 230000008030 elimination Effects 0.000 claims description 21
- 238000003379 elimination reaction Methods 0.000 claims description 21
- 238000012423 maintenance Methods 0.000 claims description 12
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 9
- 230000004888 barrier function Effects 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
Disclosed by the invention is a kind of electric car service brake force aid system, including brake pedal switch, vacuum pressure sensor, entire car controller, barometric pressure sensor, electric vacuum pump, relay group and battery group, entire car controller respectively with brake pedal switch, barometric pressure sensor, vacuum pressure sensor and the connection setting of electric vacuum pump phase control, battery group is electrically connected by relay group with electric vacuum pump, relay group includes the two common relays and duplicate relay being arranged in parallel, two relays are connect with entire car controller phase control respectively.The present invention discloses the control strategy and method for diagnosing faults of a kind of electric car service brake force aid system simultaneously.The present invention passes through the data such as acquisition atmospheric pressure, system vacuum pressure and brake switch, make the electric vacuum pump control strategy for meeting vehicle service brake power-assisted, preferably meet the thermoacoustic prime engine requirement of electric car, and forms a set of significantly more efficient driving faults warning strategies.
Description
Technical field
The present invention relates to new-energy automobile control system field, more specifically a kind of electric car service brake
Force aid system and its control strategy and method for diagnosing faults.
Background technique
The negative pressure and atmospheric pressure generated when the principle of fuel-engined vehicle brake vacuum power-assisted is using engine operation at present it
Between pressure difference come generate brake boost effect, with mitigate implement to brake pedal power.And electric car is using Motorized vacuum
Pump work then brings some problems, including:
1. vacuum degree stops working when meeting system requirements, start work when insufficient；
2. due to the horizontal life problems of the current industry of relay；
3. electric vacuum pump can reach vacuum degree difference in different altitude height；
4. service brake force aid system fault-free alerts；
Therefore, in actual demand, it is necessary to provide the new service brake force aid system of one kind to solve problem above.
Summary of the invention
Disclosed by the invention is a kind of electric car service brake force aid system and its control strategy and method for diagnosing faults,
Main purpose is to overcome deficiencies of the prior art and disadvantage.
The technical solution adopted by the invention is as follows:
A kind of electric car service brake force aid system, including brake pedal switch, vacuum pressure sensor, entire car controller,
Barometric pressure sensor, electric vacuum pump, relay group and battery group, the entire car controller are stepped on the braking respectively
Switching plate, barometric pressure sensor, vacuum pressure sensor and the connection setting of electric vacuum pump phase control, the battery group are logical
The relay group is crossed to be electrically connected with the electric vacuum pump, the relay group include two common relays being arranged in parallel and
Duplicate relay, two relays are connect with the entire car controller phase control respectively；The electric vacuum pump and vacuum gas storage
Tank is connected, and the vacuum pressure sensor is used for the pressure of the real-time monitoring vacuum air storage tank.
Further, also it is connected between the battery and the relay group and is equipped with insurance resistance.
Further, the battery is 12V battery.
A kind of control strategy and method for diagnosing faults of electric car service brake force aid system, including walk in detail below
It is rapid:
Step 1: judged input signal and handled: input signal includes: brake pedal switch signal, atmospheric pressure sensing
Device signal and vacuum pressure sensor signal, entire car controller are judged and are handled in advance to above-mentioned each input signal；
Step 2: the control to electric vacuum pump: entire car controller carries out control work to electric vacuum pump, and carries out electronic true
The fault diagnosis of sky pump；
Step 3: the control to relay: entire car controller carries out control work to relay, and the failure for carrying out relay is examined
It is disconnected；
Step 4: detection and fault diagnosis to vacuum pressure sensor: entire car controller controls vacuum pressure sensor
Work, and carry out the fault diagnosis of vacuum pressure sensor.
Further, entire car controller prejudges each input signal in the step 1 and processing includes: to atmosphere
The signal of pressure sensor input carries out height above sea level locating for judgement vehicle, and carries out judgement setting to each work threshold values.
Further, it includes square in detail below that entire car controller, which carries out control work to electric vacuum pump, in the step 2
Formula:
A, judge effective operating condition, if being in charged state, vacuum system is invalid；If key gets to ON grades, no matter vehicle
It is in which kind of state, vacuum system is all effective；If key gets to OFF grades, and force aid system is in lower electric delay state, vacuum
System is effective；
B, when key gets to ON grades for the first time, if detecting, current vacuum level is greater than termination of pumping threshold values, opens electric vacuum pump, until
Closing when reaching termination of pumping threshold values；
C, normal vehicle operation, if detecting, current vacuum level is greater than the turn on pump threshold values of setting, opens electric vacuum pump, until
Closing when reaching termination of pumping threshold values.
Further, entire car controller includes mode in detail below to the fault diagnosis of electric vacuum pump in the step 2:
A, the too low warning of initial depression: after powering on for the first time, vacuum degree crosses low valve valve if it is less than the vacuum degree of setting, then issues
The too low warning of initial depression, and reporting fault processing is carried out, restore automatically after Failure elimination；
B, the excessively high warning of vacuum degree: after powering on, when monitoring alarming threshold value of the vacuum degree higher than setting, then it is excessively high to issue vacuum degree
Warning, and reporting fault processing is carried out, restore automatically after Failure elimination；
C, gas circuit minor leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the light of setting
When tiny leakage threshold values, then gas circuit minor leakage failure is issued, and reporting fault is handled, meanwhile, speed limit is carried out to max. speed, therefore
Barrier restores automatically after eliminating；
D, gas circuit moderate leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the moderate of setting
When leaking threshold values, alternatively, the vacuum pressure value drop-out value of gas circuit is less than when brakeless signal and electric vacuum pump continues working 6s
When 0, then gas circuit moderate leakage failure is issued, and reporting fault is handled, meanwhile, speed limit carried out to max. speed, after Failure elimination
It is automatic to restore；
E, gas circuit height leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the height of setting
When leaking threshold values, then gas circuit height leakage failure is issued, and reporting fault is handled, meanwhile, speed limit, failure are carried out to max. speed
It is re-powered after elimination；
F, single operating time transfinites: it is more than setting longest working time T when the working time of electric vacuum pump, meanwhile, it does not reach
To electric vacuum pump is closed, then issuing single operating time transfinites failure, and reporting fault is handled, meanwhile, to max. speed into
Row speed limit, and force to stop Motorized vacuum pump work 7s, it is re-powered after Failure elimination.
Further, entire car controller carries out control work and fault diagnosis to relay in the step 3, including following
Concrete mode:
A, carry out adhesion detection: when relay is in an off state, force aid system detection relay sample amplitude when reproduced whether be
High level then goes up telegraph relay adhesion fault if high level；
B, when key gets to ON grades for the first time, force aid system is only closed duplicate relay, and whether detects relay sample amplitude when reproduced
" duplicate relay failure " is reported if not high level for high level；If high level, then common relay is closed after timing 1s
Device commonly uses timing 0.5s after relay closure, disconnects duplicate relay, and detects whether relay sample amplitude when reproduced is high electricity
It is flat, if not high level, report " common relay failure "；
C, non-" key beats ON grades for the first time ", when electric vacuum pump reaches unlocking condition, force aid system is closed common relay, and examines
It surveys whether relay sample amplitude when reproduced is high level, has close command that high level is not detected if continuing 0.5s, exchange common
With duplicate relay state, and " common relay failure " is reported；
D, two-way relay failure when system control instruction is closure vacuum pump relay, but detects that relay is not closed,
Two-way vacuum pump relay failure, and reporting fault are then issued, meanwhile, restricted speed just re-powers after waiting Failure eliminations；
E, relay 1 service life early warning, when entire car controller detects that single channel relay access times reach maintenance setting value, then
Relay 1 service life early warning is issued to reset after waiting maintenances using specific software；
F, relay 2 service life early warning, when entire car controller detects that single channel relay access times reach maintenance setting value, then
Relay 2 service life early warning is issued to reset after waiting maintenances using specific software.
Further, entire car controller carries out control work and fault diagnosis to vacuum pressure sensor in the step 4,
Including mode in detail below:
A, vacuum pressure sensor fails: when pressure sensor signal is not detected, issuing vacuum pressure sensor failure event
Hinder, and reporting fault, meanwhile, control electric vacuum pump presses the circulation of " stopping 7 seconds in work 7 seconds ", and limits max. speed, waits event
Barrier restores automatically after eliminating；
B, vacuum pressure sensor is abnormal: when the pressure value for detecting vacuum pressure sensor is less than minimum threshold values or is greater than maximum
When threshold values, vacuum pressure sensor abnormal failure, and reporting fault are issued, meanwhile, control electric vacuum pump is by " work stops for 7 seconds
Only 7 seconds " circulation, and limit max. speed, restore automatically after waiting Failure eliminations.
Further, the vacuum pressure sensor failure and vacuum pressure sensor are abnormal in overtension state,
Vacuum pressure sensor failure is prior to vacuum pressure sensor exception.
By the above-mentioned description of this invention it is found that compared to the prior art, the present invention has the advantages that
1, the present invention makes by data such as acquisition atmospheric pressure, system vacuum pressure and brake switches and meets vehicle driving
The electric vacuum pump control strategy of brake boost, preferably meets the thermoacoustic prime engine requirement of electric car, and formed it is a set of more
Effective driving faults warning strategies.
2, the present invention can satisfy vehicle 3 years 30 by the scheme and relay warning strategies of setting double relay circuit
Ten thousand kilometers use mileage, solve the low technical problem of relay average life in industry.
3, the present invention is by increasing barometric pressure sensor and vacuum system pressure sensor, in combination with electric vacuum pump
Control strategy, can solve Different Altitude region driving use, to realize more being widely popularized and applying for electric car.
4, the present invention is detected by circuit signal, is made more effective system failure warning strategies, is solved existing driving
Deficiency present in control system.
5, controller is integrated to entire car controller by the present invention, instead of independent electric vacuum pump controller, structure
More rationally, control effect is more optimized.
Detailed description of the invention
Fig. 1 is frame principles structural schematic diagram of the invention.
Specific embodiment
Explanation is with reference to the accompanying drawings to further explain a specific embodiment of the invention.
As shown in Figure 1, a kind of electric car service brake force aid system, including brake pedal switch, vacuum pressure sensing
Device, entire car controller, barometric pressure sensor, electric vacuum pump, relay group and battery group, the entire car controller point
It does not connect and sets with the brake pedal switch, barometric pressure sensor, vacuum pressure sensor and electric vacuum pump phase control
It sets, which is electrically connected by the relay group with the electric vacuum pump, and the relay group includes that two parallel connections are set
The common relay and duplicate relay set, two relays are connect with the entire car controller phase control respectively；It is described electronic
Vacuum pump is connected with vacuum air storage tank, and the vacuum pressure sensor is used for the pressure of the real-time monitoring vacuum air storage tank.
Further, also it is connected between the battery and the relay group and is equipped with insurance resistance.
Further, the battery is 12V battery.
A kind of control strategy and method for diagnosing faults of electric car service brake force aid system, including walk in detail below
It is rapid:
Step 1: judged input signal and handled: input signal includes: brake pedal switch signal, atmospheric pressure sensing
Device signal and vacuum pressure sensor signal, entire car controller are judged and are handled in advance to above-mentioned each input signal；
Step 2: the control to electric vacuum pump: entire car controller carries out control work to electric vacuum pump, and carries out electronic true
The fault diagnosis of sky pump；
Step 3: the control to relay: entire car controller carries out control work to relay, and the failure for carrying out relay is examined
It is disconnected；
Step 4: detection and fault diagnosis to vacuum pressure sensor: entire car controller controls vacuum pressure sensor
Work, and carry out the fault diagnosis of vacuum pressure sensor.
Further, entire car controller prejudges each input signal in the step 1 and processing includes: to atmosphere
The signal of pressure sensor input carries out height above sea level locating for judgement vehicle, and carries out judgement setting to each work threshold values.
Further, it includes square in detail below that entire car controller, which carries out control work to electric vacuum pump, in the step 2
Formula:
A, judge effective operating condition, if being in charged state, vacuum system is invalid；If key gets to ON grades, no matter vehicle
It is in which kind of state, vacuum system is all effective；If key gets to OFF grades, and force aid system is in lower electric delay state, vacuum
System is effective；
B, when key gets to ON grades for the first time, if detecting, current vacuum level is greater than termination of pumping threshold values, opens electric vacuum pump, until
Closing when reaching termination of pumping threshold values；
C, normal vehicle operation, if detecting, current vacuum level is greater than the turn on pump threshold values of setting, opens electric vacuum pump, until
Closing when reaching termination of pumping threshold values.
Further, entire car controller includes mode in detail below to the fault diagnosis of electric vacuum pump in the step 2:
A, the too low warning of initial depression: after powering on for the first time, vacuum degree crosses low valve valve if it is less than the vacuum degree of setting, then issues
The too low warning of initial depression, and reporting fault processing is carried out, restore automatically after Failure elimination；
B, the excessively high warning of vacuum degree: after powering on, when monitoring alarming threshold value of the vacuum degree higher than setting, then it is excessively high to issue vacuum degree
Warning, and reporting fault processing is carried out, restore automatically after Failure elimination；
C, gas circuit minor leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the light of setting
When tiny leakage threshold values, then gas circuit minor leakage failure is issued, and reporting fault is handled, meanwhile, speed limit is carried out to max. speed, therefore
Barrier restores automatically after eliminating；
D, gas circuit moderate leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the moderate of setting
When leaking threshold values, alternatively, the vacuum pressure value drop-out value of gas circuit is less than when brakeless signal and electric vacuum pump continues working 6s
When 0, then gas circuit moderate leakage failure is issued, and reporting fault is handled, meanwhile, speed limit carried out to max. speed, after Failure elimination
It is automatic to restore；
E, gas circuit height leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the height of setting
When leaking threshold values, then gas circuit height leakage failure is issued, and reporting fault is handled, meanwhile, speed limit, failure are carried out to max. speed
It is re-powered after elimination；
F, single operating time transfinites: it is more than setting longest working time T when the working time of electric vacuum pump, meanwhile, it does not reach
To electric vacuum pump is closed, then issuing single operating time transfinites failure, and reporting fault is handled, meanwhile, to max. speed into
Row speed limit, and force to stop Motorized vacuum pump work 7s, it is re-powered after Failure elimination.
Following table is the work threshold values table of electric vacuum pump under different altitude height:
Further, entire car controller carries out control work and fault diagnosis to relay in the step 3, including in detail below
Mode:
A, carry out adhesion detection: when relay is in an off state, force aid system detection relay sample amplitude when reproduced whether be
High level then goes up telegraph relay adhesion fault if high level；
B, when key gets to ON grades for the first time, force aid system is only closed duplicate relay, and whether detects relay sample amplitude when reproduced
" duplicate relay failure " is reported if not high level for high level；If high level, then common relay is closed after timing 1s
Device commonly uses timing 0.5s after relay closure, disconnects duplicate relay, and detects whether relay sample amplitude when reproduced is high electricity
It is flat, if not high level, report " common relay failure "；
C, non-" key beats ON grades for the first time ", when electric vacuum pump reaches unlocking condition, force aid system is closed common relay, and examines
It surveys whether relay sample amplitude when reproduced is high level, has close command that high level is not detected if continuing 0.5s, exchange common
With duplicate relay state, and " common relay failure " is reported；
D, two-way relay failure when system control instruction is closure vacuum pump relay, but detects that relay is not closed,
Two-way vacuum pump relay failure, and reporting fault are then issued, meanwhile, restricted speed just re-powers after waiting Failure eliminations；
E, relay 1 service life early warning, when entire car controller detects that single channel relay access times reach maintenance setting value, then
Relay 1 service life early warning is issued to reset after waiting maintenances using specific software；
F, relay 2 service life early warning, when entire car controller detects that single channel relay access times reach maintenance setting value, then
Relay 2 service life early warning is issued to reset after waiting maintenances using specific software.
Further, entire car controller carries out control work and fault diagnosis to vacuum pressure sensor in the step 4,
Including mode in detail below:
A, vacuum pressure sensor fails: when pressure sensor signal is not detected, issuing vacuum pressure sensor failure event
Hinder, and reporting fault, meanwhile, control electric vacuum pump presses the circulation of " stopping 7 seconds in work 7 seconds ", and limits max. speed, waits event
Barrier restores automatically after eliminating；
B, vacuum pressure sensor is abnormal: when the pressure value for detecting vacuum pressure sensor is less than minimum threshold values or is greater than maximum
When threshold values, vacuum pressure sensor abnormal failure, and reporting fault are issued, meanwhile, control electric vacuum pump is by " work stops for 7 seconds
Only 7 seconds " circulation, and limit max. speed, restore automatically after waiting Failure eliminations.
Further, the vacuum pressure sensor failure and vacuum pressure sensor are abnormal in overtension state,
Vacuum pressure sensor failure is prior to vacuum pressure sensor exception.
1, the present invention makes by data such as acquisition atmospheric pressure, system vacuum pressure and brake switches and meets vehicle
The electric vacuum pump control strategy of service brake power-assisted, preferably meets the thermoacoustic prime engine requirement of electric car, and is formed a set of
Significantly more efficient driving faults warning strategies.
2, the present invention can satisfy vehicle 3 years 30 by the scheme and relay warning strategies of setting double relay circuit
Ten thousand kilometers use mileage, solve the low technical problem of relay average life in industry.
3, the present invention is by increasing barometric pressure sensor and vacuum system pressure sensor, in combination with electric vacuum pump
Control strategy, can solve Different Altitude region driving use, to realize more being widely popularized and applying for electric car.
4, the present invention is detected by circuit signal, is made more effective system failure warning strategies, is solved existing driving
Deficiency present in control system.
5, controller is integrated to entire car controller by the present invention, instead of independent electric vacuum pump controller, structure
More rationally, control effect is more optimized.
The above is only a specific embodiment of the present invention, but design concept of the invention is not limited merely to this, all benefits
The present invention is improved with carrying out unsubstantiality with this design, should be belonged to behavior that violates the scope of protection of the present invention.
Claims (10)
1. a kind of electric car service brake force aid system, it is characterised in that: sensed including brake pedal switch, vacuum pressure
Device, entire car controller, barometric pressure sensor, electric vacuum pump, relay group and battery group, the entire car controller point
It does not connect and sets with the brake pedal switch, barometric pressure sensor, vacuum pressure sensor and electric vacuum pump phase control
It sets, which is electrically connected by the relay group with the electric vacuum pump, and the relay group includes that two parallel connections are set
The common relay and duplicate relay set, two relays are connect with the entire car controller phase control respectively；It is described electronic
Vacuum pump is connected with vacuum air storage tank, and the vacuum pressure sensor is used for the pressure of the real-time monitoring vacuum air storage tank.
2. a kind of electric car service brake force aid system according to claim 1, it is characterised in that: the battery with
Also it is connected between the relay group and is equipped with insurance resistance.
3. a kind of electric car service brake force aid system according to claim 1, it is characterised in that: the electric power storage
Pond is 12V battery.
4. a kind of control strategy and method for diagnosing faults of electric car service brake force aid system, it is characterised in that: including with
Lower specific steps:
Step 1: judged input signal and handled: input signal includes: brake pedal switch signal, atmospheric pressure sensing
Device signal and vacuum pressure sensor signal, entire car controller are judged and are handled in advance to above-mentioned each input signal；
Step 2: the control to electric vacuum pump: entire car controller carries out control work to electric vacuum pump, and carries out electronic true
The fault diagnosis of sky pump；
Step 3: the control to relay: entire car controller carries out control work to relay, and the failure for carrying out relay is examined
It is disconnected；
Step 4: detection and fault diagnosis to vacuum pressure sensor: entire car controller controls vacuum pressure sensor
Work, and carry out the fault diagnosis of vacuum pressure sensor.
5. control strategy and the fault diagnosis side of a kind of electric car service brake force aid system according to claim 4
Method, it is characterised in that: entire car controller prejudges each input signal in the step 1 and processing includes: to atmospheric pressure
The signal of force snesor input carries out height above sea level locating for judgement vehicle, and carries out judgement setting to each work threshold values.
6. control strategy and the fault diagnosis side of a kind of electric car service brake force aid system according to claim 4
Method, it is characterised in that: it includes mode in detail below that entire car controller, which carries out control work to electric vacuum pump, in the step 2:
A, judge effective operating condition, if being in charged state, vacuum system is invalid；If key gets to ON grades, no matter vehicle
It is in which kind of state, vacuum system is all effective；If key gets to OFF grades, and force aid system is in lower electric delay state, vacuum
System is effective；
B, when key gets to ON grades for the first time, if detecting, current vacuum level is greater than termination of pumping threshold values, opens electric vacuum pump, until
Closing when reaching termination of pumping threshold values；
C, normal vehicle operation, if detecting, current vacuum level is greater than the turn on pump threshold values of setting, opens electric vacuum pump, until
Closing when reaching termination of pumping threshold values.
7. control strategy and the fault diagnosis side of a kind of electric car service brake force aid system according to claim 6
Method, it is characterised in that: entire car controller includes mode in detail below to the fault diagnosis of electric vacuum pump in the step 2:
A, the too low warning of initial depression: after powering on for the first time, vacuum degree crosses low valve valve if it is less than the vacuum degree of setting, then issues
The too low warning of initial depression, and reporting fault processing is carried out, restore automatically after Failure elimination；
B, the excessively high warning of vacuum degree: after powering on, when monitoring alarming threshold value of the vacuum degree higher than setting, then it is excessively high to issue vacuum degree
Warning, and reporting fault processing is carried out, restore automatically after Failure elimination；
C, gas circuit minor leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the light of setting
When tiny leakage threshold values, then gas circuit minor leakage failure is issued, and reporting fault is handled, meanwhile, speed limit is carried out to max. speed, therefore
Barrier restores automatically after eliminating；
D, gas circuit moderate leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the moderate of setting
When leaking threshold values, alternatively, the vacuum pressure value drop-out value of gas circuit is less than when brakeless signal and electric vacuum pump continues working 6s
When 0, then gas circuit moderate leakage failure is issued, and reporting fault is handled, meanwhile, speed limit carried out to max. speed, after Failure elimination
It is automatic to restore；
E, gas circuit height leakage failure: when brakeless signal, and continuing 6s, and the vacuum pressure value of gas circuit rises to the height of setting
When leaking threshold values, then gas circuit height leakage failure is issued, and reporting fault is handled, meanwhile, speed limit, failure are carried out to max. speed
It is re-powered after elimination；
F, single operating time transfinites: it is more than setting longest working time T when the working time of electric vacuum pump, meanwhile, it does not reach
To electric vacuum pump is closed, then issuing single operating time transfinites failure, and reporting fault is handled, meanwhile, to max. speed into
Row speed limit, and force to stop Motorized vacuum pump work 7s, it is re-powered after Failure elimination.
8. control strategy and the fault diagnosis side of a kind of electric car service brake force aid system according to claim 4
Method, it is characterised in that: entire car controller carries out control work and fault diagnosis, including following tool to relay in the step 3
Body mode:
A, carry out adhesion detection: when relay is in an off state, force aid system detection relay sample amplitude when reproduced whether be
High level then goes up telegraph relay adhesion fault if high level；
B, when key gets to ON grades for the first time, force aid system is only closed duplicate relay, and whether detects relay sample amplitude when reproduced
" duplicate relay failure " is reported if not high level for high level；If high level, then common relay is closed after timing 1s
Device commonly uses timing 0.5s after relay closure, disconnects duplicate relay, and detects whether relay sample amplitude when reproduced is high electricity
It is flat, if not high level, report " common relay failure "；
C, non-" key beats ON grades for the first time ", when electric vacuum pump reaches unlocking condition, force aid system is closed common relay, and examines
It surveys whether relay sample amplitude when reproduced is high level, has close command that high level is not detected if continuing 0.5s, exchange common
With duplicate relay state, and " common relay failure " is reported；
D, two-way relay failure when system control instruction is closure vacuum pump relay, but detects that relay is not closed,
Two-way vacuum pump relay failure, and reporting fault are then issued, meanwhile, restricted speed just re-powers after waiting Failure eliminations；
E, relay 1 service life early warning, when entire car controller detects that single channel relay access times reach maintenance setting value, then
Relay 1 service life early warning is issued to reset after waiting maintenances using specific software；
F, relay 2 service life early warning, when entire car controller detects that single channel relay access times reach maintenance setting value, then
Relay 2 service life early warning is issued to reset after waiting maintenances using specific software.
9. control strategy and the fault diagnosis side of a kind of electric car service brake force aid system according to claim 4
Method, it is characterised in that: entire car controller carries out control work and fault diagnosis, packet to vacuum pressure sensor in the step 4
Include mode in detail below:
A, vacuum pressure sensor fails: when pressure sensor signal is not detected, issuing vacuum pressure sensor failure event
Hinder, and reporting fault, meanwhile, control electric vacuum pump presses the circulation of " stopping 7 seconds in work 7 seconds ", and limits max. speed, waits event
Barrier restores automatically after eliminating；
B, vacuum pressure sensor is abnormal: when the pressure value for detecting vacuum pressure sensor is less than minimum threshold values or is greater than maximum
When threshold values, vacuum pressure sensor abnormal failure, and reporting fault are issued, meanwhile, control electric vacuum pump is by " work stops for 7 seconds
Only 7 seconds " circulation, and limit max. speed, restore automatically after waiting Failure eliminations.
10. control strategy and the fault diagnosis side of a kind of electric car service brake force aid system according to claim 9
Method, it is characterised in that: the vacuum pressure sensor failure and vacuum pressure sensor are abnormal in overtension state, vacuum
Pressure sensor failure is prior to vacuum pressure sensor exception.
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| CN117302152A (en) | 2023-12-29 |
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