CN109484388A - A kind of brake of electric vehicle power assisting device diagnostic method - Google Patents
A kind of brake of electric vehicle power assisting device diagnostic method Download PDFInfo
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- CN109484388A CN109484388A CN201811567384.XA CN201811567384A CN109484388A CN 109484388 A CN109484388 A CN 109484388A CN 201811567384 A CN201811567384 A CN 201811567384A CN 109484388 A CN109484388 A CN 109484388A
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- vacuum
- pressure
- brake
- vacuum tank
- electric vehicle
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Classifications
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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
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a kind of brake of electric vehicle power assisting device diagnostic method, including pressure sensor low vacuum blocks the serious gas leakage Diagnosis of Work Conditions mode of Diagnosis of Work Conditions mode, vacuum tank, vacuum tank is slight gas leakage Diagnosis of Work Conditions mode and vacuum pump failure Diagnosis of Work Conditions mode.The brake of electric vehicle power assisting device diagnostic method of the disclosure is by diagnosing brake of electric vehicle power assisting device under the different working conditions of brake of electric vehicle power assisting device, it can timely and effectively judge brake of electric vehicle power assisting device failure mode, and failure is analyzed and processed.
Description
Technical field
The present invention relates to electric parking brake system fields, diagnose more particularly, to a kind of brake of electric vehicle power assisting device
Method.
Background technique
To improve driving facility, the braking system of electric vehicle generally includes brake booster.Common braking system
Brake booster include vacuum booster, air accumulator, pressure switch, vacuum warning switch, vacuum pump and vacuum pump control
Device.
Vacuum booster is connected to by snorkel with vacuum tank, and controller for vacuum pump is monitored in vacuum tank by pressure switch
Negative pressure whether meet the requirements, and the negative pressure in vacuum tank is controlled by the work of control vacuum pump.When the pressure in vacuum tank
When power is lower than external atmosphere pressure, driver, which tramples brake pedal, will acquire the power-assisted from vacuum booster.When in vacuum tank
When negative pressure deficiency, vacuum pump is needed to carry out air suction process to vacuum tank, to maintain the negative pressure state of vacuum tank.When due to unexpected work
When condition causes that vacuum degree is too low in vacuum tank, vacuum warning switch is opened and issues low-voltage vacuum alarm signal, and instrument board is urgent
Brake lamp is always on.
Existing brake of electric vehicle power assisting device can not judge failure mode when breaking down in time, and divide failure
Analysis processing has seriously affected the brake boost experience of electric vehicle.
Therefore, brake of electric vehicle power assisting device failure mode can timely and effectively be judged by how providing one kind, and to failure
The diagnostic method being analyzed and processed becomes the technical problem of this field urgent need to resolve.
Summary of the invention
It is an object of the present invention to provide one kind can timely and effectively judge brake of electric vehicle power assisting device failure mode,
And the new solution for the brake of electric vehicle power assisting device diagnostic method that failure is analyzed and processed.
According to the first aspect of the invention, a kind of brake of electric vehicle power assisting device diagnostic method is provided.
The brake of electric vehicle power assisting device diagnostic method includes that pressure sensor low vacuum blocks Diagnosis of Work Conditions mode, vacuum
The serious gas leakage Diagnosis of Work Conditions mode of tank, vacuum tank is slight gas leakage Diagnosis of Work Conditions mode and vacuum pump failure Diagnosis of Work Conditions mode；Its
In,
The pressure sensor low vacuum is blocked Diagnosis of Work Conditions mode and is included the following steps:
S11: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch；
S12: if the pressure in vacuum tank is less than the vacuum degree upper limit, and low-voltage vacuum alarm signal is received, then judgement is true
Sky pump whether there is failure；
S13: if failure is not present in vacuum pump, step S11 is executed after carrying out pressure discharge operations to vacuum tank；
S14: if the pressure in step S13 in vacuum tank is less than the vacuum degree upper limit, and low-voltage vacuum alarm signal is received
Time be all larger than or be equal at the first time, then issuing pressure sensor, there are the signals that low vacuum blocks failure；
The serious gas leakage Diagnosis of Work Conditions mode of vacuum tank includes the following steps:
S21: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch；
S22: if the pressure in vacuum tank is greater than or equal to vacuum degree lower limit, and not receiving low-voltage vacuum alarm signal,
Then detect whether vacuum pump has feedback current；
S23: if vacuum pump has feedback current, the pressure in vacuum tank is acquired again, and judge whether brake pedal is stepped on
Under；
S24: if brake pedal is not stepped on, and the pressure in vacuum tank be greater than or equal to vacuum degree lower limit time be greater than or
Equal to the second time, then issuing vacuum tank, there are the signals of serious principal fault；
The slight gas leakage Diagnosis of Work Conditions mode of vacuum tank includes the following steps:
S31: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch；
S32: if the pressure in vacuum tank is less than vacuum degree lower limit, and low-voltage vacuum alarm signal is not received, then detected
Whether vacuum pump has feedback current；
S33: if vacuum pump has feedback current, the pressure in vacuum tank is acquired again, and judge whether brake pedal is stepped on
Under；
S34: if brake pedal is not stepped on, and the pressure in step S33 in collected vacuum tank is equal within the third time
Less than the pressure in collected vacuum tank in step S31, then issuing vacuum tank, there are the signals of slight principal fault；
The vacuum pump failure Diagnosis of Work Conditions mode includes the following steps:
S41: whether detection vacuum pump has feedback current；
S42: if vacuum pump detects whether controller for vacuum pump issues vacuum pump working signal without feedback current；
S43: if controller for vacuum pump issues vacuum pump working signal, and vacuum pump is greater than without the duration of feedback current
Or be equal to for the 4th time, then issuing vacuum pump, there are the signals of failure.
Optionally, the vacuum degree upper limit in the step S12 and the step S14 is -80kPa.
Optionally, the pressure discharge operations in the step S13 are specific as follows:
Pressure release is carried out to vacuum tank with the pressure rising value of vacuum tank after brake pedal, and repeats n times.
Optionally, the first time in the step S14 is 5S.
Optionally, the vacuum degree lower limit in the step S22, the step S24 and the step S32 is -30kPa.
Optionally, the second time in the step S24 is 20s.
Optionally, the third time in the step S34 is 5s.
Optionally, the 4th time in the step S43 is 6s.
Optionally, it further includes step S15 that the pressure sensor low vacuum, which blocks Diagnosis of Work Conditions mode: whenever brake pedal
When being operated, vacuum pump work 5s.
Optionally, the serious gas leakage Diagnosis of Work Conditions mode of the vacuum tank further includes step S25: during brake pedal is operated
Vacuum pump continues working, vacuum pump work 5s after brake pedal unclamps.
The brake of electric vehicle power assisting device diagnostic method of the disclosure passes through the different operating conditions in brake of electric vehicle power assisting device
Under the conditions of brake of electric vehicle power assisting device is diagnosed, can timely and effectively judge brake of electric vehicle power assisting device failure kind
Class, and failure is analyzed and processed.
Specific embodiment
It will be described in various exemplary embodiments of the invention now.It should also be noted that unless specifically stated otherwise, otherwise
The component and the positioned opposite of step, numerical expression and numerical value illustrated in these embodiments does not limit the scope of the invention.
Be to the description only actually of at least one exemplary embodiment below it is illustrative, never as to the present invention
And its application or any restrictions used.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
Present disclose provides a kind of brake of electric vehicle power assisting device diagnostic methods.
The brake of electric vehicle power assisting device diagnostic method includes that pressure sensor low vacuum blocks Diagnosis of Work Conditions mode, vacuum
The serious gas leakage Diagnosis of Work Conditions mode of tank, vacuum tank is slight gas leakage Diagnosis of Work Conditions mode and vacuum pump failure Diagnosis of Work Conditions mode.
Pressure sensor low vacuum is blocked Diagnosis of Work Conditions mode and is included the following steps:
Step S11: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch.Vacuum warning switch
Capable of emitting low-voltage vacuum alarm signal when unlatching, instrument board emergency braking lamp are always on.
Step S12: if the pressure in vacuum tank is less than the vacuum degree upper limit, and low-voltage vacuum alarm signal is received, then sentenced
Disconnected vacuum pump whether there is failure.The vacuum degree upper limit in step S12 can be -80kPa.The fault diagnosis of above-mentioned vacuum pump can adopt
Realize that the disclosure is not further limited this with mode well known in the art.
Step S13: if failure is not present in vacuum pump, step S11 is executed after carrying out pressure discharge operations to vacuum tank.Vacuum tank
Pressure discharge operations may be, for example: with the pressure rising value of vacuum tank after brake pedal to vacuum tank carry out pressure release, and repeat N
It is secondary.Above-mentioned N can flexible setting according to actual needs, for example, 5 times.
Step S14: if the pressure in step S13 in vacuum tank is less than the vacuum degree upper limit, and low-voltage vacuum alarm is received
The time of signal is all larger than or is equal at the first time, then issuing pressure sensor, there are the signals that low vacuum blocks failure.Step
The vacuum degree upper limit in S14 is -80kPa.First time in step S14 can be 5S.
When it is implemented, maintenance personal can there are low vacuum to block the signal of failure to pressure sensing according to pressure sensor
Device repairs.
In order to guarantee the use of brake of electric vehicle power assisting device, pressure sensor low vacuum blocks Diagnosis of Work Conditions mode and may be used also
Including step S15: when being operated brake pedal, vacuum pump work 5s.
The serious gas leakage Diagnosis of Work Conditions mode of vacuum tank includes the following steps:
Step S21: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch.Vacuum warning switch
Capable of emitting low-voltage vacuum alarm signal when unlatching, instrument board emergency braking lamp are always on.
Step S22: if the pressure in vacuum tank is greater than or equal to vacuum degree lower limit, and low-voltage vacuum alarm signal is not received
Number, then detect whether vacuum pump has feedback current.Vacuum degree lower limit in step S22 can be -30kPa.
Step S23: if vacuum pump has feedback current, the pressure in vacuum tank is acquired again, and judge that brake pedal is
It is no to step on.
Step S24: if brake pedal is not stepped on, and the pressure in vacuum tank is big more than or equal to the time of vacuum degree lower limit
In or be equal to the second time, then issuing vacuum tank, there are the signals of serious principal fault.Vacuum degree lower limit in step S24 can
For -30kPa.The second time in step S24 can be 20s.
When it is implemented, maintenance personal can there are the signals of serious principal fault to tie up to vacuum tank according to vacuum tank
It repairs.
In order to guarantee the use of brake of electric vehicle power assisting device, the serious gas leakage Diagnosis of Work Conditions mode of vacuum tank may also include step
Rapid S25: vacuum pump continues working during brake pedal is operated, vacuum pump work 5s after brake pedal unclamps.
Vacuum tank is slight, and gas leakage Diagnosis of Work Conditions mode includes the following steps:
Step S31: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch.Vacuum warning switch
Capable of emitting low-voltage vacuum alarm signal when unlatching, instrument board emergency braking lamp are always on.
Step S32: if the pressure in vacuum tank is less than vacuum degree lower limit, and low-voltage vacuum alarm signal is not received, then
Whether detection vacuum pump has feedback current.Vacuum degree lower limit in step S32 can be -30kPa.
Step S33: if vacuum pump has feedback current, the pressure in vacuum tank is acquired again, and judge that brake pedal is
It is no to step on.
Step S34: if brake pedal is not stepped on, and the pressure in step S33 in collected vacuum tank is in the third time
The interior pressure being respectively less than in step S31 in collected vacuum tank, then issuing vacuum tank, there are the signals of slight principal fault.Step
The third time in rapid S34 can be 5s.
When it is implemented, maintenance personal can there are the signals of slight principal fault to tie up to vacuum tank according to vacuum tank
It repairs.
Vacuum pump failure Diagnosis of Work Conditions mode includes the following steps:
Step S41: whether detection vacuum pump has feedback current.
Step S42: if vacuum pump detects whether controller for vacuum pump issues vacuum pump working signal without feedback current.
Step S43: if controller for vacuum pump issues vacuum pump working signal, and duration of the vacuum pump without feedback current
More than or equal to the 4th time, then issuing vacuum pump, there are the signals of failure.The 4th time in step S43 can be 6s.
When it is implemented, maintenance personal can there are the signals number of failure to repair to vacuum pump according to vacuum pump.
Although some specific embodiments of the invention are described in detail by example, the skill of this field
Art personnel it should be understood that example above merely to being illustrated, the range being not intended to be limiting of the invention.The skill of this field
Art personnel are it should be understood that can without departing from the scope and spirit of the present invention modify to above embodiments.This hair
Bright range is defined by the following claims.
Claims (10)
1. a kind of brake of electric vehicle power assisting device diagnostic method, which is characterized in that block operating condition including pressure sensor low vacuum
The serious gas leakage Diagnosis of Work Conditions mode of diagnostic mode, vacuum tank, vacuum tank is slight gas leakage Diagnosis of Work Conditions mode and vacuum pump failure work
Condition diagnostic mode；Wherein,
The pressure sensor low vacuum is blocked Diagnosis of Work Conditions mode and is included the following steps:
S11: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch；
S12: if the pressure in vacuum tank is less than the vacuum degree upper limit, and low-voltage vacuum alarm signal is received, then judges vacuum pump
With the presence or absence of failure；
S13: if failure is not present in vacuum pump, step S11 is executed after carrying out pressure discharge operations to vacuum tank；
S14: if pressure in step S13 in vacuum tank is less than the vacuum degree upper limit, and receive low-voltage vacuum alarm signal when
Between be all larger than or be equal at the first time, then issuing pressure sensor, there are the signals that low vacuum blocks failure；
The serious gas leakage Diagnosis of Work Conditions mode of vacuum tank includes the following steps:
S21: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch；
S22: if the pressure in vacuum tank is greater than or equal to vacuum degree lower limit, and low-voltage vacuum alarm signal is not received, then examined
Survey whether vacuum pump has feedback current；
S23: if vacuum pump has feedback current, the pressure in vacuum tank is acquired again, and judge whether brake pedal is stepped on；
S24: if brake pedal is not stepped on, and the pressure in vacuum tank is greater than or equal to more than or equal to the time of vacuum degree lower limit
Second time, then issuing vacuum tank, there are the signals of serious principal fault；
The slight gas leakage Diagnosis of Work Conditions mode of vacuum tank includes the following steps:
S31: the pressure in acquisition vacuum tank, and obtain the open and-shut mode of vacuum warning switch；
S32: if the pressure in vacuum tank is less than vacuum degree lower limit, and low-voltage vacuum alarm signal is not received, then detect vacuum
Whether pump has feedback current；
S33: if vacuum pump has feedback current, the pressure in vacuum tank is acquired again, and judge whether brake pedal is stepped on；
S34: if brake pedal is not stepped on, and the pressure in step S33 in collected vacuum tank is respectively less than within the third time
Pressure in step S31 in collected vacuum tank, then issuing vacuum tank, there are the signals of slight principal fault；
The vacuum pump failure Diagnosis of Work Conditions mode includes the following steps:
S41: whether detection vacuum pump has feedback current；
S42: if vacuum pump detects whether controller for vacuum pump issues vacuum pump working signal without feedback current；
S43: if controller for vacuum pump issues vacuum pump working signal, and vacuum pump was greater than or waits without the duration of feedback current
In the 4th time, then issuing vacuum pump, there are the signals of failure.
2. brake of electric vehicle power assisting device diagnostic method according to claim 1, which is characterized in that the step S12 and
The vacuum degree upper limit in the step S14 is -80kPa.
3. brake of electric vehicle power assisting device diagnostic method according to claim 1, which is characterized in that in the step S13
Pressure discharge operations it is specific as follows:
Pressure release is carried out to vacuum tank with the pressure rising value of vacuum tank after brake pedal, and repeats n times.
4. brake of electric vehicle power assisting device diagnostic method according to claim 1, which is characterized in that in the step S14
First time be 5S.
5. brake of electric vehicle power assisting device diagnostic method according to claim 1, which is characterized in that the step S22, institute
Stating the vacuum degree lower limit in step S24 and the step S32 is -30kPa.
6. brake of electric vehicle power assisting device diagnostic method according to claim 1, which is characterized in that in the step S24
The second time be 20s.
7. brake of electric vehicle power assisting device diagnostic method according to claim 1, which is characterized in that in the step S34
The third time be 5s.
8. brake of electric vehicle power assisting device diagnostic method according to claim 1, which is characterized in that in the step S43
The 4th time be 6s.
9. according to claim 1 to brake of electric vehicle power assisting device diagnostic method described in 8 any one, which is characterized in that institute
Stating pressure sensor low vacuum and blocking Diagnosis of Work Conditions mode further includes step S15: when being operated brake pedal, vacuum pump work
Make 5s.
10. according to claim 1 to brake of electric vehicle power assisting device diagnostic method described in 8 any one, which is characterized in that institute
Stating the serious gas leakage Diagnosis of Work Conditions mode of vacuum tank further includes step S25: vacuum pump continues working during brake pedal is operated, and makes
Vacuum pump work 5s after dynamic pedal unclamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567384.XA CN109484388B (en) | 2018-12-20 | 2018-12-20 | Diagnosis method for brake booster of electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811567384.XA CN109484388B (en) | 2018-12-20 | 2018-12-20 | Diagnosis method for brake booster of electric vehicle |
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| CN109484388A true CN109484388A (en) | 2019-03-19 |
| CN109484388B CN109484388B (en) | 2020-07-24 |
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ID=65711125
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161876A (en) * | 2019-04-29 | 2019-08-23 | 南京航空航天大学 | A kind of optimization method of electric booster braking system brake pedal feedback |
| CN112092794A (en) * | 2020-08-20 | 2020-12-18 | 北汽福田汽车股份有限公司 | Control method and device and control system for vacuum pump of electric vehicle and vehicle |
| CN114194157A (en) * | 2021-12-31 | 2022-03-18 | 宜宾凯翼汽车有限公司 | Electric automobile vacuum pump control method based on altitude signals |
| CN115214587A (en) * | 2021-11-09 | 2022-10-21 | 广州汽车集团股份有限公司 | Control method and device of vehicle brake vacuum boosting system |
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| CN110161876A (en) * | 2019-04-29 | 2019-08-23 | 南京航空航天大学 | A kind of optimization method of electric booster braking system brake pedal feedback |
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| CN115214587B (en) * | 2021-11-09 | 2023-09-01 | 广州汽车集团股份有限公司 | Control method and device for vehicle brake vacuum power-assisted system |
| CN114194157A (en) * | 2021-12-31 | 2022-03-18 | 宜宾凯翼汽车有限公司 | Electric automobile vacuum pump control method based on altitude signals |
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