CN104477158B - Monitoring method for electric vehicle electric vacuum pump - Google Patents

Monitoring method for electric vehicle electric vacuum pump Download PDF

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Publication number
CN104477158B
CN104477158B CN201410661544.2A CN201410661544A CN104477158B CN 104477158 B CN104477158 B CN 104477158B CN 201410661544 A CN201410661544 A CN 201410661544A CN 104477158 B CN104477158 B CN 104477158B
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China
Prior art keywords
vacuum pump
vacuum
threshold value
monitoring
value
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CN201410661544.2A
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CN104477158A (en
Inventor
林辉
高力
杨依楠
单冲
张亚男
单红艳
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Brilliance Auto Group Holding Co Ltd
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Brilliance Auto Group Holding Co Ltd
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T17/00Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18Safety devices; Monitoring
    • B60T17/22Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T2270/00Further aspects of brake control systems not otherwise provided for
    • B60T2270/40Failsafe aspects of brake control systems
    • B60T2270/406Test-mode; Self-diagnosis

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

A kind of monitoring method for electric automobile electric vacuum pump
Technical field
The present invention relates to vacuum pump of electric automobile control field, particularly to a kind of for electric automobile electric vacuum pump Monitoring method.
Background technology
Electric automobile or hybrid vehicle adopt electric vacuum pump as the vacuum source of booster, for guaranteeing to brake When safety and controllability, need control system monitor in real time brake booster vacuum state, vacuum pump controlled in real time System, current control system can be controlled to vacuum pump for vacuum system vacuum state, but the event to vacuum system Barrier diagnosis and action policy are perfect not enough, such as publication No. is cn103863291a, entitled " a kind of to electric automobile vacuum Pump control system and control method ", only only account for the impact to vacuum for the pressure in vacuum system, do not consider and driving It is possible to also make vacuum pump system be affected when security-related other factors go wrong, therefore, current vacuum pump control Process processed is only a kind of rough control.
Content of the invention
It is an object of the invention to provide a kind of monitoring method for electric automobile electric vacuum pump, by different startups Pattern, realizes the different of vacuum system are controlled and fault diagnosis, so that the control of vacuum system while considering traffic safety System is more reasonable.
The technical scheme is that and be achieved in that: a kind of monitoring method for electric automobile electric vacuum pump, its Have technical point that and comprise the steps:
Step 1: after electricity on electric automobile, self-inspection is carried out to the sensor on electric automobile and vacuum pump;
Step 2: after self-inspection is passed through, the full-vehicle control unit on electric automobile starts mould according to the signal behavior of each sensor Formula: step 2.1: if all normal return path signal of each sensor, using normal control mode:
When the vacuum of vacuum pump booster is less than vacuum pump and opens threshold value, start vacuum pump work, execution step 3;
When the vacuum of vacuum pump booster is higher than that vacuum pump closes threshold value, stop vacuum pump work;
Step 2.2: if any sensor no return path signal situation occurs, using safeguard protection pattern:
If no GES, full-vehicle control unit will specify a certain speed, calculate opening of vacuum pump using this speed Open threshold value and close threshold value, if practical vacuum angle value is less than vacuum pump and opens threshold value, start vacuum pump work, execution step 3; If practical vacuum angle value is higher than vacuum pump closes threshold value, stop vacuum pump work;
If brakeless pedal signal is then it is assumed that brake pedal has depressed, according to GES, calculate the unlatching of vacuum pump Threshold value and closing threshold value, if practical vacuum angle value is less than vacuum pump and opens threshold value, drive vacuum pump work;If practical vacuum angle value Close threshold value higher than vacuum pump, then stop vacuum pump work, start vacuum pump emergency warning lamp simultaneously;
If no atmosphere pressure signal, a certain atmospheric pressure is specified to be current atmospheric pressure it is intended that it is certain that vacuum pump opens threshold value One fixed value, if practical vacuum angle value is less than the vacuum pump specified and opens threshold value, vacuum pump is opened and is continued for some time, holds Row step 3;
If non helping hand device vacuum signal, start vacuum pump emergency warning lamp, by controlling brake pedal, control vacuum pump referring to Unlatching in fixing time, closing;
Step 3: in vacuum pump running hours, the vacuum of real-time monitoring vacuum booster, if this vacuum degree is referring to Determine in vacuum ranges and not up to vacuum pump closes threshold value, then should open vacuum pump, and certain time, until vacuum pump The vacuum of booster reaches and stops during the closing threshold value of vacuum pump;If vacuum degree is not within specified vacuum degree scope, Vacuum boost system fault, starts vacuum pump emergency warning lamp.
If the no GES described in step 2.2, full-vehicle control unit also should be according to whether have brake pedal signal Determine the unlatching threshold value of vacuum pump and close threshold value.
If the no GES described in step 2.2, a certain speed that full-vehicle control unit is specified, should be at least above 30km/h.
If it is intended that the time is 10s during non helping hand device vacuum signal described in step 2.2.
Vacuum pump certain time described in step 3, should close threshold value according to vacuum pump and determine.
Beneficial effects of the present invention: the present invention has three kinds of start-up mode by setting full-vehicle control unit, is just respectively Often control model, clean boot pattern, fault diagnosis and warning start-up mode, for different start-up mode, respectively to vacuum Pump adopts different control strategies, makes the control of vacuum system more reasonable, and then has reached the safer purpose of driving.
Brief description
Fig. 1 is the monitoring system block diagram of electric automobile electric vacuum pump in the embodiment of the present invention;
Fig. 2 is a kind of general flow chart of the monitoring method for electric automobile electric vacuum pump in the embodiment of the present invention;
Fig. 3 is electric automobile self-inspection flow chart in the embodiment of the present invention;
Fig. 4 is normal startup mode flow chart in the embodiment of the present invention.
Specific embodiment
1~4 pair of embodiments of the invention is described in further detail below in conjunction with the accompanying drawings.
The monitoring system for electric automobile electric vacuum pump employed in the present embodiment is as shown in Figure 1.Comprising: it is whole Car control unit 1 and respectively connected brake pedal rotary angle transmitter 3, temperature and pressure transmitter 4, vehicle speed sensor 5, storage Battery 6 and control relay 5, one end of control relay 5 connects vacuum boost system 2, the vacuum with vacuum sensor 9 Booster 2 further includes: vacuum pump 7 and connected booster 8, and vacuum pump one end is also associated with control relay 5. Brake pedal rotary angle transmitter 3, temperature and pressure transmitter 4, vehicle speed sensor 5 and vacuum sensor 9 will collect respectively Signal return is to controller 1.
The method of the monitoring of electric automobile electric vacuum pump is as shown in Figure 2.Comprise the following steps:
For step 201, after electricity on electric automobile, electric automobile starts self-inspection.Now, vacuum pump emergency warning lamp persistently point , to remind driver to note, the control process of self-inspection is as shown in Figure 3 for bright 2s.In step 301~308, full-vehicle control unit ecu according to Secondary reading vacuum pump cycle of operation times signal ccycle, vacuum pump net cycle time t, brake pedal signal bls, GES v, Voltage signal vvolt, ambient temperature signal t, ambient pressure signal patm, vacuum signal vacb.In step 309, drive vacuum pump Work 1s.In step 310, judge whether the pressure in vacuum pump booster now is increased to 0.05patm, such as meet, then exist Step 311, vacuum pump emergency warning lamp is closed, process of self-test terminates, and is such as unsatisfactory for, then continue to light vacuum pump emergency warning lamp, checks Each sensor whether normal work, restarts process of self-test.
For step 202, full-vehicle control unit ecu selects control strategy, the present embodiment according to the signal of each sensor In control strategy include normal control mode, clean boot pattern, fault diagnosis and report to the police three kinds of start-up mode.
After electric automobile self-inspection, full-vehicle control unit ecu starts normal control mode, and its flow process is as shown in Figure 4.In step Rapid 401~step 403, full-vehicle control unit ecu receives atmosphere pressure signal patm, GES v, brake pedal signal bls, In step 404, the threshold value being turned on and off using the vacuum degree of the signal of change vacuum pump booster collecting.In step 405, read vacuum pump state.Judging whether vacuum pump is opened in step 406, if opening, continuing to judge currently in step 407 The vacuum degree vac of vacuum pump boosterbWhether close threshold value vac more than the vacuum of vacuum pumpoffIf being more than, in step 408 closing vacuum pumps, if being less than, open vacuum pump in step 410;If vacuum pump is not opened, judge vacuum in step 409 Vacuum vac in boosterbWhether opening threshold value less than vacuum pump, if being less than, opening vacuum pump in step 410, otherwise, Close vacuum pump in step 408.
If in the sensor of electric automobile, there is any sensor to break down, there is no return path signal, then full-vehicle control unit Ecu starts clean boot pattern, including following situation:
1) if no GES, when that is, full-vehicle control unit ecu can't detect the GES in can bus, recognize Fixed vehicle trouble now is not serious, need not light vacuum pump emergency warning lamp.When calculating vacuum pump unlatching threshold value or closing threshold value, refer to Determining speed is more than 30km/h, under this speed it is intended that during brake pedal signal bls=1, calculate vacuum pump unlatching threshold value and Close threshold value to be respectively as follows:
vacon=0.6patm
vacoff=0.8patm
Under this speed it is intended that during brake pedal signal bls=0, calculate the unlatching threshold value of vacuum pump and close threshold value respectively For:
vacon=0.7patm
vacoff=0.8patm
Using the practical vacuum angle value in vacuum sensor Measuring Vacuum booster, if practical vacuum angle value is less than very Threshold value opened by empty pump, then start vacuum pump work, execution step 203;If practical vacuum angle value is higher than vacuum pump closes threshold value, Stop vacuum pump work;
2) if brakeless pedal signal, now need to light vacuum pump emergency warning lamp.Calculate vacuum pump and open threshold value or closing It is intended that brake pedal signal bls=0 during threshold value, calculate in specified speed, during such as v > 30km/h, vacuum pump opens threshold value or pass Close threshold value to be respectively as follows:
vacon=0.7patm
vacoff=0.8patm
Calculate in specified speed, < during 30km/h, vacuum pump opens threshold value to such as v or closing threshold value is respectively as follows:
vacon=0.6patm
vacoff=0.7patm
Using the practical vacuum angle value in vacuum sensor Measuring Vacuum booster, if practical vacuum angle value is less than very Threshold value opened by empty pump, then start vacuum pump work;If practical vacuum angle value is higher than vacuum pump closes threshold value, stop vacuum pump work Make;
3) if no atmosphere pressure signal, emergency warning lamp should be started.Specified current atmospheric pressure is patm=100kpa, speed be v < 30m/h is it is intended that it is vac that vacuum pump opens threshold valueon=0.5patm, then utilize in vacuum sensor Measuring Vacuum booster Practical vacuum angle value, if practical vacuum angle value is less than vacuum pump and opens threshold value, starts vacuum pump work, execution step 203;If Practical vacuum angle value is higher than that vacuum pump closes threshold value, then stop vacuum pump work.
4) vacuum degree of booster if non helping hand device vacuum signal, now or cannot be obtained, then should start vacuum pump police Accuse lamp.Meanwhile, the control to vacuum pump is realized by brake pedal, the set of time stepped on every time is 10s, i.e. vacuum pump Open in 10s, stop afterwards.It is operated always to prevent brake pedal, vacuum pump is persistently enabled the feelings of work Before condition is it is desirable to start vacuum pump every time, whether detection braking pedal signal is changed into 0 from 1, only brake pedal signal has change Change, just allow to control by brake pedal next time vacuum pump to open.
In step 203, in vacuum pump running hours, the true of vacuum sensor real-time monitoring vacuum booster should be utilized Reciprocal of duty cycle, the situation of the continuous work of the vacuum pump being controlled by brake pedal in the present embodiment is not tried out in this method for diagnosing faults.
In the present embodiment, including to the fault diagnosis of vacuum pump system, the diagnosis of vacuum sensor and related other The fault diagnosis of equipment.For example, the present embodiment specified vacuum pump cuts out threshold value is vacoff=0.7patm, if then examine in step 202 The practical vacuum angle value measuring falls in specified (0,0.3) patmIn vacuum ranges, then vacuum pump is controlled to help vacuum in 8s The pressure of power device is extracted into 0.7 patmIf failing to realize in 8s, vacuum pump system fault being described, emergency warning lamp should be started.
If the practical vacuum angle value then detecting in step 202 falls in specified (0.3,0.6) patmIn vacuum ranges, Then control vacuum pump, in 6s, the pressure of vacuum booster is extracted into 0.7 patmIf failing to realize in 6s, vacuum pump being described The system failure, should start emergency warning lamp.
For example it is intended that it is vac that vacuum pump closes threshold valueoff=0.8patm, if then detect in step 202 is actual true Reciprocal of duty cycle value falls in specified (0,0.5) patmIn vacuum ranges, then control vacuum pump by the pressure of vacuum booster in 10s It is extracted into 0.8 patmIf failing to realize in 10s, vacuum pump system fault being described, emergency warning lamp should be started.
If the practical vacuum angle value then detecting in step 202 falls in specified (0.5,0.7) patmIn vacuum ranges, Then control vacuum pump, in 8s, the pressure of vacuum booster is extracted into 0.8 patmIf failing to realize in 8s, vacuum pump being described The system failure, should start emergency warning lamp.
For another example, if vacuum transducer output voltage is more than 4.5v or is more than or equal to 100ms less than 0.5v and persistent period (can demarcate), then be judged to vacuum sensor fault.
And for example, other faults need situation about reporting to the police also to include: 1) brake booster vacuum is less than 0.3patm;2) booster Leakage;3) vacuum pump failure;4) no atmosphere pressure signal patm or atmospheric pressure abnormal signal;5) no vacuum signal or vacuum Abnormal signal;6) vacuum pump cycle of operation number of times >=300000 time;7) vacuum pump cycle of operation number of times >=400h.
Although the foregoing describing the specific embodiment of the present invention, those skilled in the art in the art should manage Solution, these are merely illustrative of, and can make various changes or modifications to these embodiments, without departing from the principle of the present invention And essence.The scope of the present invention is only limited by the claims that follow.

Claims (5)

1. a kind of monitoring method for electric automobile electric vacuum pump it is characterised in that: comprise the steps:
Step 1: after electricity on electric automobile, self-inspection is carried out to the sensor on electric automobile and vacuum pump;
Step 2: after self-inspection is passed through, full-vehicle control unit on electric automobile is according to the signal behavior start-up mode of each sensor: Step 2.1: if all normal return path signal of each sensor, using normal control mode:
When the vacuum of vacuum pump booster is less than vacuum pump and opens threshold value, start vacuum pump work, execution step 3;
When the vacuum of vacuum pump booster is higher than that vacuum pump closes threshold value, stop vacuum pump work;
Step 2.2: if any sensor no return path signal situation occurs, using safeguard protection pattern:
If no GES, full-vehicle control unit will specify a certain speed, calculate the unlatching threshold of vacuum pump using this speed Value and closing threshold value, practical vacuum angle value and vacuum pump are opened threshold value and are compared, if practical vacuum angle value is opened less than vacuum pump Open threshold value, then start vacuum pump work, execution step 3;If practical vacuum angle value is higher than vacuum pump closes threshold value, stop vacuum Pump work;
If brakeless pedal signal is then it is assumed that brake pedal has depressed, according to GES, calculate the unlatching threshold value of vacuum pump With close threshold value, practical vacuum angle value and vacuum pump are opened threshold value and are compared, if practical vacuum angle value is less than vacuum pump unlatching Threshold value, drives vacuum pump work;If practical vacuum angle value is higher than vacuum pump closes threshold value, stops vacuum pump work, open simultaneously Dynamic vacuum pump emergency warning lamp;
If no atmosphere pressure signal, specify current atmospheric pressure it is intended that it is a certain fixed value that vacuum pump opens threshold 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 specified and opens threshold value, vacuum pump Open and continue for some time, execution step 3;
If non helping hand device vacuum signal, start vacuum pump emergency warning lamp, by controlling brake pedal, control vacuum pump when specified Interior opening and closing;
Step 3: in vacuum pump running hours, the vacuum of real-time monitoring vacuum booster, if this vacuum degree is being specified very In the range of reciprocal of duty cycle and not up to vacuum pump closes threshold value, then open vacuum pump work, and certain time, until vacuum pump helps The vacuum of power device reaches and stops during the closing threshold value of vacuum pump;If vacuum degree is not within specified vacuum degree scope, very Empty power boost failure, starts vacuum pump emergency warning lamp.
2. be used for as claimed in claim 1 the monitoring method of electric automobile electric vacuum pump it is characterised in that: step 2.2 institute If the no GES stated, full-vehicle control unit also should be according to whether have brake pedal signal to determine the unlatching threshold of vacuum pump Value and closing threshold value.
3. be used for as claimed in claim 1 the monitoring method of electric automobile electric vacuum pump it is characterised in that: step 2.2 institute If the no GES stated, a certain speed that full-vehicle control unit is specified, should be at least above 30km/h.
4. be used for as claimed in claim 1 the monitoring method of electric automobile electric vacuum pump it is characterised in that: step 2.2 institute If it is intended that the time is 10s during the non helping hand device vacuum signal stated.
5. be used for as claimed in claim 1 the monitoring method of electric automobile electric vacuum pump it is characterised in that: described in step 3 Vacuum pump certain time, threshold value should be closed according to vacuum pump and the vacuum ranges specified determine.
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