CN109484388B - Diagnosis method for brake booster of electric vehicle - Google Patents
Diagnosis method for brake booster of electric vehicle Download PDFInfo
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- CN109484388B CN109484388B CN201811567384.XA CN201811567384A CN109484388B CN 109484388 B CN109484388 B CN 109484388B CN 201811567384 A CN201811567384 A CN 201811567384A CN 109484388 B CN109484388 B CN 109484388B
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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
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- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a method for diagnosing a brake boosting device of an electric vehicle, which comprises a low-vacuum-blocking working condition diagnosis mode of a pressure sensor, a severe air leakage working condition diagnosis mode of a vacuum tank, a slight air leakage working condition diagnosis mode of the vacuum tank and a fault working condition diagnosis mode of a vacuum pump. According to the diagnosis method for the electric vehicle brake power assisting device, the electric vehicle brake power assisting device is diagnosed under different working conditions of the electric vehicle brake power assisting device, the fault type of the electric vehicle brake power assisting device can be timely and effectively judged, and the fault is analyzed and processed.
Description
Technical Field
The invention relates to the field of electric vehicle brake systems, in particular to a diagnosis method for an electric vehicle brake booster device.
Background
To improve driving convenience, a brake system of an electric vehicle generally includes a brake booster. The conventional brake boosting device of the brake system comprises a vacuum booster, an air storage tank, a pressure switch, a vacuum alarm switch, a vacuum pump and a vacuum pump controller.
The vacuum booster is communicated with the vacuum tank through the vent pipe, the vacuum pump controller monitors whether the negative pressure in the vacuum tank meets the requirement through the pressure switch, and the negative pressure in the vacuum tank is controlled by controlling the work of the vacuum pump. When the pressure in the vacuum tank is lower than the outside atmospheric pressure, the driver steps on the brake pedal to acquire the assist force from the vacuum booster. When the negative pressure in the vacuum tank is insufficient, the vacuum pump is required to perform pumping operation on the vacuum tank to maintain the negative pressure state of the vacuum tank. When the vacuum degree in the vacuum tank is too low due to an unexpected working condition, the vacuum alarm switch is turned on and sends out a low-pressure vacuum alarm signal, and the emergency brake lamp of the instrument panel is normally on.
The existing electric vehicle brake boosting device cannot judge the fault type in time when the fault occurs, and the fault is analyzed and processed, so that the brake boosting experience of the electric vehicle is seriously influenced.
Therefore, how to provide a diagnosis method which can effectively judge the fault type of the brake booster of the electric vehicle in time and analyze and process the fault becomes a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a novel technical scheme of a diagnosis method of an electric vehicle brake booster, which can effectively judge the fault type of the electric vehicle brake booster in time and analyze and process the fault.
According to a first aspect of the invention, a method for diagnosing a brake boosting device of an electric vehicle is provided.
The diagnosis method of the brake booster unit of the electric vehicle comprises a low vacuum blocking working condition diagnosis mode of a pressure sensor, a severe air leakage working condition diagnosis mode of a vacuum tank, a mild air leakage working condition diagnosis mode of the vacuum tank and a fault working condition diagnosis mode of a vacuum pump; wherein the content of the first and second substances,
the low vacuum blocking working condition diagnosis mode of the pressure sensor comprises the following steps:
s11: collecting the pressure in the vacuum tank and acquiring the on-off state of a vacuum alarm switch;
s12: if the pressure in the vacuum tank is smaller than the upper limit of the vacuum degree and a low-pressure vacuum alarm signal is received, judging whether the vacuum pump has a fault or not;
s13: if the vacuum pump has no fault, performing pressure relief operation on the vacuum tank and then executing step S11;
s14: if the pressure in the vacuum tank is smaller than the upper limit of the vacuum degree in the step S13 and the time for receiving the low-pressure vacuum alarm signal is larger than or equal to the first time, sending a signal that the pressure sensor has a low-vacuum clamping fault;
the method for diagnosing the severe air leakage working condition of the vacuum tank comprises the following steps of:
s21: collecting the pressure in the vacuum tank and acquiring the on-off state of a vacuum alarm switch;
s22: if the pressure in the vacuum tank is greater than or equal to the lower limit of the vacuum degree and the low-pressure vacuum alarm signal is not received, detecting whether the vacuum pump has feedback current or not;
s23: if the vacuum pump has feedback current, the pressure in the vacuum tank is collected again, and whether the brake pedal is stepped down is judged;
s24: if the brake pedal is not stepped on, and the time that the pressure in the vacuum tank is greater than or equal to the lower limit of the vacuum degree is greater than or equal to the second time, a signal that the vacuum tank has serious air leakage fault is sent;
the method for diagnosing the light air leakage working condition of the vacuum tank comprises the following steps of:
s31: collecting the pressure in the vacuum tank and acquiring the on-off state of a vacuum alarm switch;
s32: if the pressure in the vacuum tank is smaller than the lower limit of the vacuum degree and the low-pressure vacuum alarm signal is not received, detecting whether the vacuum pump has feedback current or not;
s33: if the vacuum pump has feedback current, the pressure in the vacuum tank is collected again, and whether the brake pedal is stepped down is judged;
s34: if the brake pedal is not pressed down and the pressure in the vacuum tank collected in the step S33 is less than the pressure in the vacuum tank collected in the step S31 within the third time, sending a signal that the vacuum tank has a slight air leakage fault;
the vacuum pump fault condition diagnosis mode comprises the following steps:
s41: detecting whether the vacuum pump has feedback current or not;
s42: if the vacuum pump has no feedback current, detecting whether a vacuum pump controller sends a vacuum pump working signal or not;
s43: and if the vacuum pump controller sends out a vacuum pump working signal and the duration time of the vacuum pump without the feedback current is greater than or equal to the fourth time, sending out a signal that the vacuum pump has a fault.
Optionally, the upper limit of the vacuum degree in the step S12 and the step S14 is-80 kPa.
Optionally, the pressure relief operation in step S13 is specifically as follows:
and (4) releasing the pressure of the vacuum tank according to the pressure rise value of the vacuum tank after the brake pedal is stepped on, and repeating the process for N times.
Optionally, the first time in step S14 is 5S.
Optionally, the lower limit of the vacuum degree in the step S22, the step S24 and the step S32 is-30 kPa.
Optionally, the second time in step S24 is 20S.
Optionally, the third time in step S34 is 5S.
Optionally, the fourth time in step S43 is 6S.
Optionally, the pressure sensor low vacuum stuck condition diagnosis mode further includes step S15: the vacuum pump is operated for 5s each time the brake pedal is depressed.
Optionally, the method for diagnosing the severe air leakage condition of the vacuum tank further includes step S25: the vacuum pump is continuously operated during the period that the brake pedal is pressed, and the vacuum pump is operated for 5s after the brake pedal is released.
According to the diagnosis method for the electric vehicle brake power assisting device, the electric vehicle brake power assisting device is diagnosed under different working conditions of the electric vehicle brake power assisting device, the fault type of the electric vehicle brake power assisting device can be timely and effectively judged, and the fault is analyzed and processed.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The disclosure provides a method for diagnosing a brake boosting device of an electric vehicle.
The method for diagnosing the brake boosting device of the electric vehicle comprises a pressure sensor low-vacuum clamping working condition diagnosis mode, a vacuum tank severe air leakage working condition diagnosis mode, a vacuum tank slight air leakage working condition diagnosis mode and a vacuum pump fault working condition diagnosis mode.
The low vacuum blocking working condition diagnosis mode of the pressure sensor comprises the following steps:
step S11: and acquiring the pressure in the vacuum tank and acquiring the on-off state of the vacuum alarm switch. When the vacuum alarm switch is turned on, a low-pressure vacuum alarm signal can be sent out, and an emergency brake lamp of the instrument panel is normally on.
Step S12: and if the pressure in the vacuum tank is smaller than the upper limit of the vacuum degree and the low-pressure vacuum alarm signal is received, judging whether the vacuum pump has a fault. The upper limit of the degree of vacuum in step S12 may be-80 kPa. The above-mentioned fault diagnosis of the vacuum pump can be implemented by means known in the art, and the present disclosure does not limit this further.
Step S13: if the vacuum pump has no fault, the vacuum tank is depressurized and the step S11 is executed. The operation of venting the vacuum tank may be, for example: and (4) releasing the pressure of the vacuum tank according to the pressure rise value of the vacuum tank after the brake pedal is stepped on, and repeating the process for N times. The N can be flexibly set according to actual requirements, for example, 5 times.
Step S14: and if the pressure in the vacuum tank is smaller than the upper limit of the vacuum degree in the step S13 and the time for receiving the low-pressure vacuum alarm signal is larger than or equal to the first time, sending a signal that the low-vacuum clamping fault exists in the pressure sensor. The upper limit of the degree of vacuum in step S14 was-80 kPa. The first time in step S14 may be 5S.
When the pressure sensor is specially implemented, maintenance personnel can maintain the pressure sensor according to the signal that the pressure sensor has the low vacuum clamping fault.
In order to ensure the use of the brake boosting device of the electric vehicle, the low vacuum stuck condition diagnosis mode of the pressure sensor may further include step S15: the vacuum pump is operated for 5s each time the brake pedal is depressed.
The method for diagnosing the severe air leakage working condition of the vacuum tank comprises the following steps:
step S21: and acquiring the pressure in the vacuum tank and acquiring the on-off state of the vacuum alarm switch. When the vacuum alarm switch is turned on, a low-pressure vacuum alarm signal can be sent out, and an emergency brake lamp of the instrument panel is normally on.
Step S22: and if the pressure in the vacuum tank is greater than or equal to the lower limit of the vacuum degree and the low-pressure vacuum alarm signal is not received, detecting whether the vacuum pump has feedback current or not. The lower limit of the vacuum degree in step S22 may be-30 kPa.
Step S23: if the vacuum pump has feedback current, the pressure in the vacuum tank is collected again, and whether the brake pedal is stepped on or not is judged.
Step S24: and if the brake pedal is not stepped on and the time that the pressure in the vacuum tank is greater than or equal to the lower limit of the vacuum degree is greater than or equal to the second time, sending a signal that the vacuum tank has serious air leakage fault. The lower limit of the vacuum degree in step S24 may be-30 kPa. The second time in step S24 may be 20S.
When the vacuum tank maintenance device is specifically implemented, maintenance personnel can maintain the vacuum tank according to the signal that the vacuum tank has serious air leakage fault.
In order to ensure the use of the brake boosting device of the electric vehicle, the diagnosis mode of the severe air leakage condition of the vacuum tank may further include step S25: the vacuum pump is continuously operated during the period that the brake pedal is pressed, and the vacuum pump is operated for 5s after the brake pedal is released.
The method for diagnosing the light air leakage working condition of the vacuum tank comprises the following steps of:
step S31: and acquiring the pressure in the vacuum tank and acquiring the on-off state of the vacuum alarm switch. When the vacuum alarm switch is turned on, a low-pressure vacuum alarm signal can be sent out, and an emergency brake lamp of the instrument panel is normally on.
Step S32: and if the pressure in the vacuum tank is smaller than the lower limit of the vacuum degree and the low-pressure vacuum alarm signal is not received, detecting whether the vacuum pump has feedback current or not. The lower limit of the vacuum degree in step S32 may be-30 kPa.
Step S33: if the vacuum pump has feedback current, the pressure in the vacuum tank is collected again, and whether the brake pedal is stepped on or not is judged.
Step S34: if the brake pedal is not pressed down and the pressure in the vacuum tank collected in the step S33 is less than the pressure in the vacuum tank collected in the step S31 within the third time, a signal that a light air leakage fault exists in the vacuum tank is sent. The third time in step S34 may be 5S.
When the vacuum tank maintenance device is specifically implemented, maintenance personnel can maintain the vacuum tank according to the signal that the vacuum tank has slight air leakage fault.
The vacuum pump fault condition diagnosis mode comprises the following steps:
step S41: and detecting whether the vacuum pump has feedback current.
Step S42: and if the vacuum pump has no feedback current, detecting whether the vacuum pump controller sends a vacuum pump working signal or not.
Step S43: and if the vacuum pump controller sends out a vacuum pump working signal and the duration time of the vacuum pump without the feedback current is greater than or equal to the fourth time, sending out a signal that the vacuum pump has a fault. The fourth time in step S43 may be 6S.
When the vacuum pump maintenance method is specifically implemented, maintenance personnel can maintain the vacuum pump according to the signal number of the fault of the vacuum pump.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. The method for diagnosing the brake boosting device of the electric vehicle is characterized by comprising a pressure sensor low-vacuum clamping working condition diagnosis mode, a vacuum tank severe air leakage working condition diagnosis mode, a vacuum tank slight air leakage working condition diagnosis mode and a vacuum pump fault working condition diagnosis mode; wherein the content of the first and second substances,
the low vacuum blocking working condition diagnosis mode of the pressure sensor comprises the following steps:
s11: collecting the pressure in the vacuum tank and acquiring the on-off state of a vacuum alarm switch;
s12: if the pressure in the vacuum tank is smaller than the pressure corresponding to the upper limit of the vacuum degree and a low-pressure vacuum alarm signal is received, judging whether the vacuum pump has a fault or not;
s13: if the vacuum pump has no fault, performing pressure relief operation on the vacuum tank and then executing step S11;
s14: if the pressure in the vacuum tank in the step S13 is smaller than the pressure corresponding to the upper limit of the vacuum degree and the time of receiving the low-pressure vacuum alarm signal is greater than or equal to the first time, a signal that the pressure sensor has a low-vacuum clamping fault is sent out;
the method for diagnosing the severe air leakage working condition of the vacuum tank comprises the following steps of:
s21: collecting the pressure in the vacuum tank and acquiring the on-off state of a vacuum alarm switch;
s22: if the pressure in the vacuum tank is greater than or equal to the pressure corresponding to the lower limit of the vacuum degree and the low-pressure vacuum alarm signal is not received, detecting whether the vacuum pump has feedback current or not;
s23: if the vacuum pump has feedback current, the pressure in the vacuum tank is collected again, and whether the brake pedal is stepped down is judged;
s24: if the brake pedal is not stepped on, and the time that the pressure in the vacuum tank is greater than or equal to the pressure corresponding to the lower limit of the vacuum degree is greater than or equal to the second time, a signal that the vacuum tank has serious air leakage fault is sent;
the method for diagnosing the light air leakage working condition of the vacuum tank comprises the following steps of:
s31: collecting the pressure in the vacuum tank and acquiring the on-off state of a vacuum alarm switch;
s32: if the vacuum degree in the vacuum tank is smaller than the lower limit of the vacuum degree and the low-pressure vacuum alarm signal is not received, detecting whether the vacuum pump has feedback current or not;
s33: if the vacuum pump has feedback current, the pressure in the vacuum tank is collected again, and whether the brake pedal is stepped down is judged;
s34: if the brake pedal is not pressed down and the pressure in the vacuum tank collected in the step S33 is less than the pressure in the vacuum tank collected in the step S31 within the third time, sending a signal that the vacuum tank has a slight air leakage fault;
the vacuum pump fault condition diagnosis mode comprises the following steps:
s41: detecting whether the vacuum pump has feedback current or not;
s42: if the vacuum pump has no feedback current, detecting whether a vacuum pump controller sends a vacuum pump working signal or not;
s43: and if the vacuum pump controller sends out a vacuum pump working signal and the duration time of the vacuum pump without the feedback current is greater than or equal to the fourth time, sending out a signal that the vacuum pump has a fault.
2. The electric vehicle brake booster diagnostic method of claim 1, wherein the pressure corresponding to the upper vacuum level in the steps S12 and S14 is-80 kPa.
3. The electric vehicle brake booster diagnosis method according to claim 1, wherein the pressure relief operation in step S13 is specifically as follows:
and (4) releasing the pressure of the vacuum tank according to the pressure rise value of the vacuum tank after the brake pedal is stepped on, and repeating the process for N times.
4. The electric vehicle brake booster diagnostic method of claim 1, wherein the first time in step S14 is 5S.
5. The electric vehicle brake booster diagnostic method of claim 1, wherein the pressure corresponding to the lower vacuum level limit in the step S22, the step S24, and the step S32 is-30 kPa.
6. The electric vehicle brake booster diagnostic method of claim 1, wherein the second time in step S24 is 20S.
7. The electric vehicle brake booster diagnostic method of claim 1, wherein the third time in step S34 is 5S.
8. The electric vehicle brake booster diagnostic method of claim 1, wherein the fourth time in step S43 is 6S.
9. The electric vehicle brake booster diagnostic method of any one of claims 1 to 8, wherein the pressure sensor stuck-low condition diagnostic mode further comprises step S15: the vacuum pump is operated for 5s each time the brake pedal is depressed.
10. The diagnostic method for a brake boosting device for an electric vehicle according to any one of claims 1 to 8, wherein the vacuum tank severe leakage condition diagnostic mode further comprises step S25: the vacuum pump is continuously operated during the period that the brake pedal is pressed, and the vacuum pump is operated for 5s after the brake pedal is released.
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| CN201811567384.XA CN109484388B (en) | 2018-12-20 | 2018-12-20 | Diagnosis method for brake booster of electric vehicle |
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| CN110161876B (en) * | 2019-04-29 | 2021-01-08 | 南京航空航天大学 | Optimization method for brake pedal feedback of electric power-assisted brake system |
| 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 |
| 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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| JPH0825537B2 (en) * | 1989-04-28 | 1996-03-13 | 有限会社ヴィップ国際救命センター | Vacuum packing method for clothes or bedding and storage bag for vacuum packing |
| GB2304840B (en) * | 1995-09-06 | 1998-11-11 | Rover Group | Vacuum bleeding equipment |
| DE10152760A1 (en) * | 2001-10-29 | 2003-05-08 | Continental Teves Ag & Co Ohg | Brake servo for motor vehicle has vacuum power booster with safety valve to compensate for leakage of control valve |
| EP1836576B1 (en) * | 2004-12-17 | 2012-02-01 | Korea Research Institute of Standards and Science | A precision diagnostic method for the failure protection and predictive maintenance of a vacuum pump and a precision diagnostic system therefor |
| CN101767580B (en) * | 2008-12-30 | 2012-12-19 | 比亚迪股份有限公司 | Brake vacuum assist system and brake vacuum assist method of hybrid power automobile |
| CN101890949B (en) * | 2010-07-30 | 2012-11-07 | 重庆长安汽车股份有限公司 | Vacuum booster security control system and control method of strong hybrid electric vehicle |
| CN102490714B (en) * | 2011-12-12 | 2013-12-11 | 中联重科股份有限公司 | Vacuum power-assisted braking system of electric automobile and control method thereof |
| CN103318165B (en) * | 2013-06-27 | 2015-09-23 | 奇瑞新能源汽车技术有限公司 | Vacuum boost system method of inspection and system, electronlmobil and fault detection method |
| CN105966382B (en) * | 2016-05-03 | 2019-02-22 | 北京新能源汽车股份有限公司 | The height above sea level evaluation method and device of electric car and its local environment |
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