CN104477158A - Monitoring method for electric vehicle electric vacuum pump - Google Patents
Monitoring method for electric vehicle electric vacuum pump Download PDFInfo
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- CN104477158A CN104477158A CN201410661544.2A CN201410661544A CN104477158A CN 104477158 A CN104477158 A CN 104477158A CN 201410661544 A CN201410661544 A CN 201410661544A CN 104477158 A CN104477158 A CN 104477158A
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- vacuum pump
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- 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
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
-
- 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
- B60T2270/00—Further aspects of brake control systems not otherwise provided for
- B60T2270/40—Failsafe aspects of brake control systems
- B60T2270/406—Test-mode; Self-diagnosis
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention relates to a monitoring method for an electric vehicle electric vacuum pump and belongs to the technical field of electric vehicle vacuum pump control. According to the method, a vehicle control unit is set with three start modes; when the control unit is in a normal control mode, a vacuum pump is turned on to work when the vacuum degree of a vacuum pump booster is lower than a vacuum pump start threshold value, and the vacuum pump is turned off to stop working when the vacuum degree of the vacuum pump booster is higher than a vacuum pump closing threshold; when the control unit is in a safety control mode, different vacuum pump start or closing thresholds are determined according to different sensor faults, and the vacuum pump is controlled according to comparison results of actual vacuum degree values with the thresholds; a troubleshooting mode is started to control the vacuum pump when the vacuum pump works continuously. By means of the monitoring method for the electric vehicle electric vacuum pump, the control of a vacuum system is reasonable so as to achieve the purpose of safe driving.
Description
Technical field
The present invention relates to vacuum pump of electric automobile control field, particularly a kind of method for supervising for electronlmobil electric vacuum pump.
Background technology
Electronlmobil or hybrid vehicle adopt electric vacuum pump to originate as the degree of vacuum of servo-unit, for guarantee brake time safety and controllability, control system is needed to monitor booster vacuum degree state in real time, real-time control is carried out to vacuum pump, current control system can control vacuum pump for vacuum system vacuum state, but to the trouble diagnosing of vacuum system and action policy perfect not enough, such as publication No. is CN103863291A, name is called " a kind of to vacuum pump of electric automobile control system and control method ", only consider the impact of the pressure in vacuum system on degree of vacuum, when not considering that other factors relevant with traffic safety go wrong, vacuum pump system is likely also made to be affected, therefore, current vacuum pump control process is only a kind of control roughly.
Summary of the invention
The object of this invention is to provide a kind of method for supervising for electronlmobil electric vacuum pump, by different start-up mode, realize controlling and trouble diagnosing the difference of vacuum system, while consideration traffic safety, make the control of vacuum system more reasonable.
Technical scheme of the present invention is achieved in that a kind of method for supervising for electronlmobil electric vacuum pump, and its technical essential is: comprise the steps:
Step 1: after electronlmobil powers on, carries out self-inspection to the sensor on electronlmobil and vacuum pump;
Step 2: after self-inspection is passed through, the full-vehicle control unit on electronlmobil is according to the signal behavior start-up mode of each sensor: step 2.1: if all normal return path signal of each sensor, then adopt normal control mode:
When the low vacuum of vacuum pump servo-unit opens threshold value in vacuum pump, start vacuum pump work, perform step 3;
When the degree of vacuum of vacuum pump servo-unit closes threshold value higher than vacuum pump, stop vacuum pump work;
Step 2.2: arbitrary sensor is without return path signal situation if occur, then adopt safety guard-safeguard pattern:
If without vehicle speed signal, then full-vehicle control unit will specify a certain speed of a motor vehicle, utilize this speed of a motor vehicle to calculate the unlatching threshold value of vacuum pump and to close threshold value, if practical vacuum angle value opens threshold value lower than vacuum pump, then start vacuum pump work, perform step 3; If practical vacuum angle value closes threshold value higher than vacuum pump, then stop vacuum pump work;
If brakeless pedal signal, then think that brake pedal depresses, according to vehicle speed signal, calculate the unlatching threshold value of vacuum pump and close threshold value, if practical vacuum angle value opens threshold value lower than vacuum pump, driving vacuum pump work; If practical vacuum angle value closes threshold value higher than vacuum pump, then stop vacuum pump work, start vacuum pump warning light simultaneously;
If without atmosphere pressure signal, then specify a certain barometric pressure to be current atmospheric pressure, threshold value opened by specified vacuum pump is a certain fixed value, if practical vacuum angle value is less than the vacuum pump of specifying open threshold value, then vacuum pump is opened and continued for some time, and performs step 3;
If non helping hand device degree of vacuum signal, starting vacuum pump warning light, by controlling brake pedal, controlling the at the appointed time interior unlatching of vacuum pump, closedown;
Step 3: at vacuum pump running hours, the degree of vacuum of Real-Time Monitoring vacuum booster, if this vacuum degree within the scope of specified vacuum degree and do not reach vacuum pump close threshold value, then vacuum pump should be opened, and certain time, until stop when the degree of vacuum of vacuum pump servo-unit reaches the closedown threshold value of vacuum pump; If vacuum degree is not within specified vacuum degree scope, then vacuum boost system fault, start vacuum pump warning light.
If described in step 2.2 without vehicle speed signal, whether full-vehicle control unit also should be determined the unlatching threshold value of vacuum pump according to having brake pedal signal and close threshold value.
If described in step 2.2 without vehicle speed signal, then the full-vehicle control unit a certain speed of a motor vehicle of specifying, at least should be greater than 30km/h.
If during non helping hand device degree of vacuum signal described in step 2.2, the fixed time is 10s.
Vacuum pump certain time described in step 3, should close threshold value according to vacuum pump and determine.
beneficial effect of the present invention:the present invention has three kinds of start-up mode by setting full-vehicle control unit, normal control mode, clean boot pattern, trouble diagnosing and warning start-up mode respectively, for different start-up mode, respectively different control policies is adopted to vacuum pump, make the control of vacuum system more reasonable, and then reach the safer object of driving.
Accompanying drawing explanation
Fig. 1 is the monitored control system block diagram of electronlmobil electric vacuum pump in the embodiment of the present invention;
Fig. 2 is the general flow chart of a kind of method for supervising for electronlmobil electric vacuum pump in the embodiment of the present invention;
Fig. 3 is electronlmobil self-inspection diagram of circuit in the embodiment of the present invention;
Fig. 4 is normal startup mode diagram of circuit in the embodiment of the present invention.
Detailed description of the invention
Be described in further detail below in conjunction with accompanying drawing 1 ~ 4 pair of embodiments of the invention.
The monitored control system for electronlmobil electric vacuum pump adopted in the present embodiment as shown in Figure 1.It comprises: full-vehicle control unit 1 and respectively connected brake pedal rotary angle transmitter 3, temperature and pressure transmitter 4, car speed sensor 5, storage battery 6 and control relay 5, one end of control relay 5 connects vacuum boost system 2, vacuum booster 2 with vacuum sensor 9 comprises further: vacuum pump 7 and connected servo-unit 8, and vacuum pump one end is also connected with control relay 5.Brake pedal rotary angle transmitter 3, temperature and pressure transmitter 4, car speed sensor 5 and vacuum sensor 9 respectively by the signal return that collects to controller 1.
The method of the monitoring of electronlmobil electric vacuum pump as shown in Figure 2.Comprise the following steps:
For step 201, after electronlmobil powers on, electronlmobil starts self-inspection.Now, vacuum pump warning light continues to light 2s and notes to remind chaufeur, and the control process of self-inspection as shown in Figure 3.In step 301 ~ 308, full-vehicle control unit ECU reads vacuum pump working cycle times signal C successively
cycle, vacuum pump net cycle time t, brake pedal signal BLS, vehicle speed signal V, voltage signal V
volt, ambient temperature signal T, ambient pressure signal P
atm, degree of vacuum signal VAC
b.In step 309, drive vacuum pump work 1s.In step 310, judge whether the pressure in vacuum pump servo-unit is now increased to 0.05P
atm, as met, then in step 311, closed by vacuum pump warning light, process of self-test terminates, and if do not met, then continuing to light vacuum pump warning light, checking whether each sensor normally works, and restarts process of self-test.
For step 202, full-vehicle control unit ECU selects control policy according to the signal of each sensor, and the control policy in the present embodiment comprises normal control mode, clean boot pattern, trouble diagnosing and three kinds of start-up mode of reporting to the police.
After electronlmobil self-inspection, full-vehicle control unit ECU starts normal control mode, and its flow process as shown in Figure 4.In step 401 ~ step 403, full-vehicle control unit ECU receives atmosphere pressure signal P
atm, vehicle speed signal V, brake pedal signal BLS, in step 404, utilize the threshold value that the vacuum degree of calculated signals vacuum pump servo-unit collected is opened or closed.In step 405, read vacuum pump state.Judge whether vacuum pump is opened in step 406, if open, then continue in step 407 the vacuum degree VAC judging current vacuum pump servo-unit
bthe degree of vacuum whether being greater than vacuum pump closes threshold value VAC
offif be greater than, then close vacuum pump in step 408, if be less than, then open vacuum pump in step 410; If vacuum pump is not opened, then judge the degree of vacuum VAC in vacuum booster in step 409
bwhether be less than vacuum pump and open threshold value, if be less than, then open vacuum pump in step 410, otherwise, close vacuum pump in step 408.
If in the sensor of electronlmobil, have arbitrary sensor experiences failure, do not have return path signal, then full-vehicle control unit ECU starts clean boot pattern, comprises following situation:
1), if without vehicle speed signal, when namely full-vehicle control unit ECU can't detect from vehicle speed signal in CAN, assert that vehicle trouble is now not serious, without the need to lighting vacuum pump warning light.When calculating vacuum pump unlatching threshold value or closedown threshold value, specify the speed of a motor vehicle for being greater than 30km/h, under this speed of a motor vehicle, when specifying brake pedal signal BLS=1, the unlatching threshold value calculating vacuum pump is respectively with closedown threshold value:
VAC
on=0.6P
atm
VAC
off=0.8P
atm
Under this speed of a motor vehicle, when specifying brake pedal signal BLS=0, the unlatching threshold value and the closedown threshold value that calculate vacuum pump are respectively:
VAC
on=0.7Patm
VAC
off=0.8Patm
Utilize the practical vacuum angle value in vacuum sensor Measuring Vacuum servo-unit, if practical vacuum angle value opens threshold value lower than vacuum pump, then start vacuum pump work, perform step 203; If practical vacuum angle value closes threshold value higher than vacuum pump, then stop vacuum pump work;
2) if brakeless pedal signal, then now need to light vacuum pump warning light.When calculating vacuum pump unlatching threshold value or close threshold value, specify brake pedal signal BLS=0, calculate the speed of a motor vehicle of specifying, during as V>30km/h, vacuum pump is opened threshold value or is closed threshold value and is respectively:
VAC
on=0.7Patm
VAC
off=0.8Patm
Calculate the speed of a motor vehicle of specifying, during as V<30km/h, vacuum pump is opened threshold value or is closed threshold value and is respectively:
VAC
on=0.6Patm
VAC
off=0.7Patm
Utilize the practical vacuum angle value in vacuum sensor Measuring Vacuum servo-unit, if practical vacuum angle value opens threshold value lower than vacuum pump, then start vacuum pump work; If practical vacuum angle value closes threshold value higher than vacuum pump, then stop vacuum pump work;
3) if without atmosphere pressure signal, warning light should be started.Appointment current atmospheric pressure is P
atm=100kpa, the speed of a motor vehicle is V<30m/h, and threshold value opened by specified vacuum pump is VAC
on=0.5Patm, then utilize the practical vacuum angle value in vacuum sensor Measuring Vacuum servo-unit, if practical vacuum angle value opens threshold value lower than vacuum pump, then starts vacuum pump work, perform step 203; If practical vacuum angle value closes threshold value higher than vacuum pump, then stop vacuum pump work.
4) if non helping hand device degree of vacuum signal, the vacuum degree of servo-unit now or cannot be obtained, then should start vacuum pump warning light.Meanwhile, by stepping on the control of brake pedal realization to vacuum pump, the set of time at every turn stepped on is 10s, and namely vacuum pump is opened in 10s, stops afterwards.Be operated to prevent brake pedal always, situation that vacuum pump continues the work of being enabled, before requiring each startup vacuum pump, detect brake pedal signal and whether become 0 from 1, only have brake pedal signal to change, just allow control vacuum pump by brake pedal next time and open.
In step 203, at vacuum pump running hours, should utilize the degree of vacuum of vacuum sensor Real-Time Monitoring vacuum booster, the situation of the vacuum pump continuous working controlled by brake pedal in the present embodiment is not tried out in this method for diagnosing faults.
In the present embodiment, comprise the trouble diagnosing to the trouble diagnosing of vacuum pump system, the diagnosis of vacuum sensor and other equipment of being correlated with.Such as, the present embodiment specified vacuum pump cuts out threshold value is VAC
off=0.7Patm, if the practical vacuum angle value then detected in step 202 drops on (0, the 0.3) P specified
atmin vacuum ranges, then control vacuum pump, in 8s, the pressure of vacuum booster is extracted into 0.7 P
atmif fail to realize in 8s, then vacuum pump system fault is described, should warning light be started.
If the practical vacuum angle value then detected in step 202 drops on (0.3, the 0.6) P specified
atmin vacuum ranges, then control vacuum pump, in 6s, the pressure of vacuum booster is extracted into 0.7 P
atmif fail to realize in 6s, then vacuum pump system fault is described, should warning light be started.
Such as, it is VAC that specified vacuum pump cuts out threshold value
off=0.8Patm, if the practical vacuum angle value then detected in step 202 drops on (0, the 0.5) P specified
atmin vacuum ranges, then control vacuum pump, in 10s, the pressure of vacuum booster is extracted into 0.8 P
atmif fail to realize in 10s, then vacuum pump system fault is described, should warning light be started.
If the practical vacuum angle value then detected in step 202 drops on (0.5, the 0.7) P specified
atmin vacuum ranges, then control vacuum pump, in 8s, the pressure of vacuum booster is extracted into 0.8 P
atmif fail to realize in 8s, then vacuum pump system fault is described, should warning light be started.
For another example, if vacuum transducer output voltage is greater than 4.5V or is less than 0.5V and time length is more than or equal to 100ms(can demarcate), be then judged to be vacuum sensor fault.
And for example, other faults need the situation of reporting to the police also to comprise: 1) booster vacuum degree is lower than 0.3Patm; 2) booster leak; 3) vacuum pump failure; 4) without atmosphere pressure signal Patm or barometric pressure abnormal signal; 5) without degree of vacuum signal or degree of vacuum abnormal signal; 6) vacuum pump working cycle number of times >=300000 time; 7) vacuum pump working cycle number of times >=400h.
Although the foregoing describe the specific embodiment of the present invention, the those skilled in the art in this area should be appreciated that these are only casehistorys, can make various changes or modifications, and do not deviate from principle of the present invention and essence to these embodiments.Scope of the present invention is only defined by the appended claims.
Claims (5)
1. for a method for supervising for electronlmobil electric vacuum pump, it is characterized in that: comprise the steps:
Step 1: after electronlmobil powers on, carries out self-inspection to the sensor on electronlmobil and vacuum pump;
Step 2: after self-inspection is passed through, the full-vehicle control unit on electronlmobil is according to the signal behavior start-up mode of each sensor: step 2.1: if all normal return path signal of each sensor, then adopt normal control mode:
When the low vacuum of vacuum pump servo-unit opens threshold value in vacuum pump, start vacuum pump work, perform step 3;
When the degree of vacuum of vacuum pump servo-unit closes threshold value higher than vacuum pump, stop vacuum pump work;
Step 2.2: arbitrary sensor is without return path signal situation if occur, then adopt safety guard-safeguard pattern:
If without vehicle speed signal, then full-vehicle control unit will specify a certain speed of a motor vehicle, utilize this speed of a motor vehicle to calculate the unlatching threshold value of vacuum pump and to close threshold value, practical vacuum angle value and vacuum pump are opened threshold value and are compared, if practical vacuum angle value opens threshold value lower than vacuum pump, then start vacuum pump work, perform step 3; If practical vacuum angle value closes threshold value higher than vacuum pump, then stop vacuum pump work;
If brakeless pedal signal, then think that brake pedal depresses, according to vehicle speed signal, calculate the unlatching threshold value of vacuum pump and close threshold value, practical vacuum angle value and vacuum pump are opened threshold value and are compared, if practical vacuum angle value opens threshold value lower than vacuum pump, drive vacuum pump work; If practical vacuum angle value closes threshold value higher than vacuum pump, then stop vacuum pump work, start vacuum pump warning light simultaneously;
If without atmosphere pressure signal, a certain barometric pressure is then specified to be current atmospheric pressure, threshold value opened by specified vacuum pump is a certain fixed value, practical vacuum angle value and vacuum pump are opened threshold value and are compared, if practical vacuum angle value is less than the vacuum pump of specifying open threshold value, then vacuum pump is opened and is continued for some time, and performs step 3;
If non helping hand device degree of vacuum signal, starting vacuum pump warning light, by controlling brake pedal, controlling the opening and closing that vacuum pump is at the appointed time interior;
Step 3: at vacuum pump running hours, the degree of vacuum of Real-Time Monitoring vacuum booster, if this vacuum degree within the scope of specified vacuum degree and do not reach vacuum pump close threshold value, then open vacuum pump work, and certain time, until stop when the degree of vacuum of vacuum pump servo-unit reaches the closedown threshold value of vacuum pump; If vacuum degree is not within specified vacuum degree scope, then vacuum boost system fault, start vacuum pump warning light.
2. as claimed in claim 1 for the method for supervising of electronlmobil electric vacuum pump, it is characterized in that: if described in step 2.2 without vehicle speed signal, whether full-vehicle control unit also should be determined the unlatching threshold value of vacuum pump according to having brake pedal signal and close threshold value.
3., as claimed in claim 1 for the method for supervising of electronlmobil electric vacuum pump, it is characterized in that: if described in step 2.2 without vehicle speed signal, then the full-vehicle control unit a certain speed of a motor vehicle of specifying, at least should be greater than 30km/h.
4. as claimed in claim 1 for the method for supervising of electronlmobil electric vacuum pump, it is characterized in that: if during non helping hand device degree of vacuum signal described in step 2.2, the fixed time is 10s.
5. as claimed in claim 1 for the method for supervising of electronlmobil electric vacuum pump, it is characterized in that: the vacuum pump certain time described in step 3, threshold value should be closed according to vacuum pump and determine with the vacuum ranges of specifying.
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|---|---|---|---|
| CN201410661544.2A CN104477158B (en) | 2014-11-19 | 2014-11-19 | Monitoring method for electric vehicle electric vacuum pump |
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| CN104477158B CN104477158B (en) | 2017-01-18 |
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