CN115230666A - Control system and method of electronic vacuum pump for new energy vehicle - Google Patents

Control system and method of electronic vacuum pump for new energy vehicle Download PDF

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Publication number
CN115230666A
CN115230666A CN202210747288.3A CN202210747288A CN115230666A CN 115230666 A CN115230666 A CN 115230666A CN 202210747288 A CN202210747288 A CN 202210747288A CN 115230666 A CN115230666 A CN 115230666A
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Prior art keywords
vacuum pump
electronic vacuum
electronic
pressure
closing
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CN202210747288.3A
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Chinese (zh)
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CN115230666B (en
Inventor
魏国凯
杨庚
金平
王秀颖
刘相斌
具龙锡
张华文
何晓引
王雷
张秀
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Faw Besturn Automotive Co ltd
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FAW Bestune Car Co Ltd
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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
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/46—Vacuum systems
    • B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
    • 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
    • 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

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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 control system and a control method of an electronic vacuum pump for a new energy vehicle, wherein the system comprises a VAM control module, a fault detection module and a control module, wherein the VAM control module is used for controlling the electronic vacuum pump and identifying faults; the VAM control module comprises an electronic vacuum pump opening and closing pressure value threshold value calculation unit, a vacuum pressure and environment pressure acquisition unit, a vacuum pressure slope calculation unit, a main cylinder pressure slope calculation unit, an opening and closing control unit, a fault diagnosis unit, an electronic vacuum pump fault processing unit, an electronic vacuum pump overheating protection unit and an electronic vacuum pump life cycle management unit. The electronic vacuum pump control method for the new energy vehicle sets working methods such as a vacuum pump working limit value, a vacuum system air leakage and vacuum system failure judgment condition, vacuum pump fault treatment, vacuum pump overheating protection, vacuum pump life cycle management and the like; the electric automobile can be transversely applied to other electric automobile types, reasonable application of the electronic vacuum pump is realized, and faults of the electronic vacuum pump can be identified to guarantee safety of a braking system.

Description

Control system and method of electronic vacuum pump for new energy vehicle
Technical Field
The invention belongs to the technical field of new energy vehicles, and particularly relates to an electronic vacuum pump control system and method for a new energy vehicle.
Background
At present, an electronic vacuum pump is widely applied to a new energy vehicle type and serves as a unique vacuum source of a whole vehicle brake boosting system, the using condition of the electronic vacuum pump directly influences the performance and safety of a vehicle brake system, and how to use the electronic vacuum pump and identify the faults of the electronic vacuum pump is particularly important.
Disclosure of Invention
The invention aims to provide a control system and a control method of an electronic vacuum pump for a new energy vehicle, and aims to solve the problems of controlling the electronic vacuum pump to work and identifying the faults of the electronic vacuum pump.
The purpose of the invention is realized by the following technical scheme:
the utility model provides an automobile-used electron vacuum pump control system of new forms of energy which characterized in that: the electronic vacuum pump control system for the new energy vehicle comprises a VAM control module, a VAM control module and a fault identification module, wherein the VAM control module is used for controlling an electronic vacuum pump and identifying faults; the VAM control module comprises an electronic vacuum pump opening and closing pressure value threshold value calculation unit, a vacuum pressure and environment pressure acquisition unit, a vacuum pressure slope calculation unit, a master cylinder pressure slope calculation unit, an opening and closing control unit, a fault diagnosis unit, an electronic vacuum pump fault processing unit, an electronic vacuum pump overheat protection unit and an electronic vacuum pump life cycle management unit;
the vacuum pressure and environment pressure acquisition unit, the vacuum pressure slope calculation unit and the main cylinder pressure slope calculation unit are respectively connected with the electronic vacuum pump opening and closing pressure value threshold value calculation unit through hard lines, and the electronic vacuum pump opening and closing pressure value threshold value calculation unit is connected with the opening and closing control unit through hard lines;
and the fault diagnosis unit and the electronic vacuum pump overheating protection unit are connected with the fault diagnosis unit through hard wires.
A control method of an electronic vacuum pump for a new energy vehicle comprises the following steps:
A. calculating the threshold value of the opening and closing pressure of the electronic vacuum pump
Firstly, calculating upper and lower pressure limits of pressure opening and closing according to the vehicle speed and the environmental pressure, and controlling the opening and closing of the electronic vacuum pump through hysteresis, wherein the opening and closing conditions of the electronic vacuum pump need to consider the position of a key door or a vehicle speed signal; the pressure threshold of the electronic vacuum pump is opened to be-55 kp, and the closing threshold is-72 kp; .
B. Vacuum system leak and vacuum system failure determination
Judging the detection of air leakage, the exit of air leakage, the recovery of air leakage fault, the detection of the failure of a vacuum system, the exit of the failure of the vacuum system and the recovery of the failure of the vacuum system; the VAM module needs to be transmitted to the HCU bottom layer for checking faults, and the faults are respectively as follows: the electronic vacuum pump is overheated or exceeds the life cycle, and the vacuum system leaks air or fails, and the two faults can be shielded independently;
C. electronic vacuum pump failure handling
The electronic vacuum pump is controlled to be opened and closed according to the braking signal, different calibration quantities are respectively set, 2 diagnosis vectors needing to be processed by the VAM module exist, and the electronic vacuum pump is controlled to be opened and closed according to the braking signal and sends vacuum pressure invalid values to the ESP; when the environmental pressure sensor fails, replacing the atmospheric pressure with the environmental pressure at the plateau of 3550 m;
D. electronic vacuum pump overheat protection
The electronic vacuum pump needs to increase the count when running and reduce the count when stopping, once the count reaches a certain threshold, the electronic vacuum pump should be closed to avoid overheating, and the electronic vacuum pump is allowed to be started until the count is reduced to the unlocking limit or a brake switch is stepped on; stepping down the brake, and if the electronic vacuum pump continues to work, the count is still increased;
E. electronic vacuum pump life cycle management
The VAM module needs to record the times and the starting time of the electronic vacuum pump of the vehicle; the times and time of last storing in the bottom layer are required to be read when the power is on every time; accumulating the starting times and time of the electronic vacuum pump in the electrifying process; recording times and time when the power is off; and when the service life of the EVP reaches, recording a fault code, and lighting an HCU fault lamp.
Further, step a, the starting threshold of the electronic vacuum pump = basic starting threshold + increasing amount of the starting threshold value by 1; the closing threshold of the electronic vacuum pump = basic closing threshold + increasing amount of closing threshold value 1; the table can be looked up according to the vehicle speed to obtain a basic vacuum pressure opening and closing threshold value; and looking up a table according to the environmental pressure to obtain the increment 1 of the opening and closing threshold values of the vacuum pressure.
Further, in the step a, the electronic vacuum pump needs to be started while satisfying the following conditions:
a1, a key door is On (or Start) or the absolute value of the vehicle speed is more than or equal to 2km/h;
a2, the value of the vacuum pressure sensor is more than or equal to an opening threshold;
the electronic vacuum pump is shut down to meet any one of the following conditions:
a3, the key door is OFF (or ACC) and the absolute value of the vehicle speed is <2km/h;
a4, the value of the vacuum pressure sensor is less than or equal to a closing threshold.
5. The method for controlling the electronic vacuum pump for the new energy vehicle according to claim 2, wherein in the step B, the specific steps of detecting air leakage, exiting air leakage, recovering air leakage fault, detecting vacuum system failure, exiting vacuum system failure and recovering vacuum system failure are as follows:
detecting air leakage judging conditions, wherein the following conditions are simultaneously met:
b1, the electronic vacuum pump is not started;
b2, braking is not stepped on;
b3, the vacuum pressure change rate is more than 10hpa/s and exceeds 5s;
exiting the air leakage judgment condition, wherein any one of the following conditions is met:
b4, starting an electronic vacuum pump;
b5, stepping on the brake;
b6, the vacuum pressure change rate is less than or equal to 10hpa/s;
and (3) air leakage fault recovery conditions, wherein the following conditions are simultaneously met:
b7, braking is not stepped on;
b8, the electronic vacuum pump does not work;
b9, vacuum pressure < -30kPa;
b10, the slope of the vacuum degree is less than or equal to 8hpa/s and exceeds 2s;
detecting failure judgment conditions of the vacuum system, wherein the following conditions are met simultaneously:
b11, starting an electronic vacuum pump;
b12, braking is not stepped on;
b13, the vacuum pressure exceeding 25s is still not less than the closing threshold;
the failure judgment condition for exiting the vacuum system is as follows: the electronic vacuum pump is turned off or brakes are stepped on;
the vacuum system failure recovery conditions are as follows: and when the vacuum pressure is smaller than a closing threshold, and two faults of air leakage and vacuum system failure are identified, the electronic vacuum pump is controlled according to a brake switch, an HCU fault lamp =2 is turned on, the vehicle speed is limited, and CC/ACC is forbidden.
Further, in step C, when the brake switch signal =1, the electronic vacuum pump is pumped for 10s, and is stopped for 2s; when the brake switch signal goes from 1 to 0, the electronic vacuum pump pumps for 10s.
Further, in step D, the brake switch signal =1 is allowed to be turned on.
Further, the slope of the increase in the count at the time of turning on the electronic vacuum pump is c0=1, i.e., 0.01s count is increased by 1; the decline slope when the electronic vacuum pump was off was c1=0.33, i.e. 0.01s count increase-0.33; the upper limit of the locking count of the electronic vacuum pump is LockThreshold =42000, namely protection is carried out after 7 minutes of accumulated work; the lower limit of the electronic vacuum pump unlock count is UnLockThreshold =40000, i.e., the electronic vacuum pump is required to be stopped for 60s for overheat recovery locking.
Further, in step E, after the life of the EVP is reached, the operation times are 120 ten thousand, the operation time is 1500h, the fault code is recorded, and the HCU fault lamp =1 is turned on.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to an electronic vacuum pump control method for a new energy vehicle, which sets working methods such as a vacuum pump working limit value, a vacuum system air leakage and vacuum system failure judgment condition, vacuum pump fault treatment, vacuum pump overheating protection, vacuum pump life cycle management and the like; the electric vehicle can be transversely applied to other electric vehicle types, so that the reasonable application of the electronic vacuum pump can be realized, and the fault of the electronic vacuum pump can be identified to ensure the safety of a braking system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows a structure of an electronic vacuum pump control system for a new energy vehicle.
Detailed Description
The invention is further illustrated by the following examples:
the present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The electronic vacuum pump is widely applied to electric vehicle types, provides a vacuum source required by braking assistance for a braking system, serves as a sole vacuum source of the whole vehicle, directly influences the performance of the vehicle braking system under the using working condition of the electronic vacuum pump, and is particularly important for managing the working condition of the electronic vacuum pump and the vacuum pump. The invention develops an electronic vacuum pump control system and method for a new energy vehicle aiming at a Pentium EV project.
The electronic vacuum pump control system for the new energy vehicle comprises a VAM (vacuum management) control module and is used for electronic vacuum pump control and fault identification. The VAM control module comprises an electronic vacuum pump opening and closing pressure value threshold value calculation unit, a vacuum pressure and environment pressure acquisition unit, a vacuum pressure slope calculation unit, a main cylinder pressure slope calculation unit, an opening and closing control unit, a fault diagnosis unit, an electronic vacuum pump fault processing unit, an electronic vacuum pump overheating protection unit and an electronic vacuum pump life cycle management unit.
The vacuum degree sensor is used for collecting a vacuum degree signal in the vacuum booster and transmitting the vacuum degree signal to the HCU, and the HCU sends a fault alarm or sends a control signal to the relay so as to control a working switch of the vacuum pump.
The vacuum pressure and environment pressure acquisition unit, the vacuum pressure slope calculation unit and the main cylinder pressure slope calculation unit are respectively connected with the electronic vacuum pump opening and closing pressure value threshold value calculation unit through hard lines, and the electronic vacuum pump opening and closing pressure value threshold value calculation unit is connected with the opening and closing control unit through hard lines.
And the fault diagnosis unit and the electronic vacuum pump overheating protection unit are connected with the fault diagnosis unit through hard wires.
The invention discloses a control method of an electronic vacuum pump for a new energy vehicle, which comprises the following steps:
1. calculating the threshold value of the opening and closing pressure of the electronic vacuum pump
Firstly, calculating upper and lower limits of pressure opening and closing pressure according to vehicle speed and ambient pressure, and then controlling the electronic vacuum pump to open and close through hysteresis, wherein the opening and closing conditions of the electronic vacuum pump need to consider key door positions or vehicle speed signals. The method specifically comprises the following steps:
the method comprises the following steps that (1) an electronic vacuum pump starting threshold = a basic starting threshold + a starting threshold value increment 1;
the closing threshold of the electronic vacuum pump = a basic closing threshold + an increasing amount of the closing threshold value of 1;
the table can be looked up according to the vehicle speed to obtain a basic vacuum pressure opening and closing threshold value;
the pressure threshold of the electronic vacuum pump is opened to be-55 kp, and the closing threshold is-72 kp;
and looking up a table according to the environmental pressure to obtain the increment 1 of the opening and closing threshold values of the vacuum pressure.
Wherein, the increment 1 for turning on and off the electronic vacuum pump is as follows:
TABLE 1 increase in vacuum pressure on and off thresholds 1 based on ambient pressure
Figure BDA0003717301110000071
The electronic vacuum pump needs to be started and simultaneously meets the following conditions:
(1) The key door is On (or Start) or the absolute value of the vehicle speed is more than or equal to 2km/h;
(2) And the value of the vacuum pressure sensor is more than or equal to the opening threshold.
The electronic vacuum pump is shut down to meet any one of the following conditions: 2
(1) key-OFF (or ACC) and vehicle speed absolute <2km/h;
(2) And the value of the vacuum pressure sensor is less than or equal to a closing threshold.
2. Vacuum system leak and vacuum system failure determination
Detecting air leakage judging conditions, wherein the following conditions are simultaneously met:
(1) The electronic vacuum pump is not started;
(2) No brake is stepped on;
(3) The vacuum pressure change rate is more than 10hpa/s and more than 5s.
Exiting the air leakage judgment condition, wherein any one of the following conditions is met:
(1) Starting the electronic vacuum pump;
(2) Stepping on the brake;
(3) The vacuum pressure change rate is less than or equal to 10hpa/s.
And (3) air leakage fault recovery conditions, wherein the following conditions are simultaneously met:
(1) The brake is not stepped on;
(2) The electronic vacuum pump does not work;
(3) Vacuum pressure < -30kPa;
(4) The slope of the vacuum degree is less than or equal to 8hpa/s and exceeds 2s.
Detecting failure judgment conditions of the vacuum system, wherein the following conditions are simultaneously met:
(1) Starting the electronic vacuum pump;
(2) No brake is stepped on;
(3) The vacuum pressure is still not less than the closing threshold for more than 25 s.
And (3) exiting the vacuum system to judge the failure condition:
the electronic vacuum pump is turned off or the brake is stepped on.
Vacuum system failure recovery conditions:
the vacuum pressure is less than a closing threshold. After two faults of air leakage and vacuum system failure are identified, the electronic vacuum pump is controlled according to a brake switch, an HCU fault lamp =2 is turned on, the vehicle speed is limited, and CC/ACC is forbidden.
The VAM module needs to be transmitted to the HCU bottom layer for checking faults, and the faults are respectively as follows:
(1) Overheating or exceeding the life cycle of the electronic vacuum pump;
(2) Vacuum system leaks or vacuum system fails.
Both types of faults can be individually masked (individually masked).
3. Electronic vacuum pump failure handling
The electronic vacuum pump is controlled to be opened and closed according to the braking signal.
When the brake switch signal =1, the electronic vacuum pump is pumped for 10s and stopped for 2s;
when the brake switch signal is from 1 to 0, the electronic vacuum pump pumps for 10s;
(different amounts of calibration were set, respectively).
The number of diagnostic vectors to be processed by the VAM module is 2, and the electronic vacuum pump controls the opening and closing according to the brake signal and sends vacuum pressure invalid values to the ESP.
TABLE 2 Fault handling
Figure BDA0003717301110000091
Figure BDA0003717301110000101
When the ambient pressure sensor fails, the atmospheric pressure is replaced by the ambient pressure at the plateau 3550 m.
4. Electronic vacuum pump overheat protection
The electronic vacuum pump needs to increase the count when running and decrease the count when stopping. Once the count reaches a certain threshold, the electronic vacuum pump should be turned off to avoid overheating, and not allowed to turn on until the count is reduced to the unlock limit or the brake switch is depressed (brake switch signal = 1).
The slope of the increase in the count when the electronic vacuum pump is turned on is c0=1, i.e., 0.01s count is increased by 1.
The decline slope when the electronic vacuum pump was turned off was c1=0.33, i.e. 0.01s count increase-0.33.
The upper limit of the electronic vacuum pump lock count is LockThreshold =42000, namely protection after 7 minutes of cumulative work.
The lower limit of the electronic vacuum pump unlock count is UnLockThreshold =40000, i.e. the overheat recovery lockout requires the electronic vacuum pump to be stopped for 60s.
The brake is depressed and the count is still incremented if the electronic vacuum pump continues to operate.
5. Electronic vacuum pump life cycle management
The VAM module needs to record the times and the starting time of the electronic vacuum pump of the vehicle.
The number of times and the time of the last time of storing in the bottom layer are required to be read when the power is on every time.
And accumulating the starting times and time of the electronic vacuum pump in the power-on process.
And recording the times and time when the power is off.
After the service life of the EVP is reached, the operation times are 120 ten thousand, the operation time is 1500h, the fault code is recorded, and the HCU fault lamp =1 is lightened. And the maintenance manual indicates that the electronic vacuum pump is close to the service life at the moment, the electronic vacuum pump needs to be replaced, and the service life base number of the electronic vacuum pump is reset as required after the replacement is finished.
The invention discloses a method for controlling an electronic vacuum pump to work for a new energy vehicle. The working method can be applied to other electric vehicle types in a transverse mode, reasonable application of the electronic vacuum pump is achieved, and faults of the electronic vacuum pump can be identified to guarantee safety of a braking system. The invention solves the problems of how to work and fault recognition of the electronic vacuum pump, and provides development basis for subsequent vehicle type application.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (9)

1. The utility model provides an automobile-used electron vacuum pump control system of new forms of energy which characterized in that: the electronic vacuum pump control system for the new energy vehicle comprises a VAM control module, a controller and a controller, wherein the VAM control module is used for controlling the electronic vacuum pump and identifying faults; the VAM control module comprises an electronic vacuum pump opening and closing pressure value threshold value calculation unit, a vacuum pressure and environment pressure acquisition unit, a vacuum pressure slope calculation unit, a main cylinder pressure slope calculation unit, an opening and closing control unit, a fault diagnosis unit, an electronic vacuum pump fault processing unit, an electronic vacuum pump overheating protection unit and an electronic vacuum pump life cycle management unit;
the vacuum pressure and environment pressure acquisition unit, the vacuum pressure slope calculation unit and the main cylinder pressure slope calculation unit are respectively connected with the electronic vacuum pump opening and closing pressure value threshold value calculation unit through hard lines, and the electronic vacuum pump opening and closing pressure value threshold value calculation unit is connected with the opening and closing control unit through hard lines;
and the fault diagnosis unit and the electronic vacuum pump overheating protection unit are connected with the fault diagnosis unit through hard wires.
2. A control method of an electronic vacuum pump for a new energy vehicle is characterized by comprising the following steps:
A. calculating the threshold value of the opening and closing pressure of the electronic vacuum pump
Firstly, calculating upper and lower pressure opening and closing limits according to vehicle speed and ambient pressure, and controlling the electronic vacuum pump to open and close through hysteresis, wherein the opening and closing conditions of the electronic vacuum pump need to consider the position of a key door or a vehicle speed signal; the pressure threshold of the electronic vacuum pump is opened to be-55 kp, and the closing threshold is-72 kp; .
B. Vacuum system leak and vacuum system failure determination
Judging the detection of air leakage, the exit of air leakage, the recovery of air leakage fault, the detection of the failure of a vacuum system, the exit of the failure of the vacuum system and the recovery of the failure of the vacuum system; the VAM module needs to be transmitted to the HCU bottom layer for checking faults, and the faults are respectively as follows: the electronic vacuum pump is overheated or exceeds the life cycle, and the vacuum system leaks air or fails, and the two faults can be shielded independently;
C. electronic vacuum pump fault handling
The electronic vacuum pump is controlled to be opened and closed according to the braking signal, different calibration quantities are respectively set, 2 diagnosis vectors needing to be processed by the VAM module exist, and the electronic vacuum pump is controlled to be opened and closed according to the braking signal and sends vacuum pressure invalid values to the ESP; when the environmental pressure sensor fails, replacing the atmospheric pressure with the environmental pressure at the plateau of 3550 m;
D. electronic vacuum pump overheating protection
The electronic vacuum pump needs to increase the count when running and reduce the count when stopping, once the count reaches a certain threshold, the electronic vacuum pump should be closed to avoid overheating, and the electronic vacuum pump is allowed to be started until the count is reduced to the unlocking limit or a brake switch is stepped on; stepping down the brake, and if the electronic vacuum pump continues to work, the count is still increased;
E. electronic vacuum pump lifecycle management
The VAM module needs to record the times and the starting time of the electronic vacuum pump of the vehicle; the times and time of last storage in the bottom layer are required to be read when the power is on every time; accumulating the starting times and time of the electronic vacuum pump in the electrifying process; recording times and time when the power is off; and when the service life of the EVP reaches, recording a fault code, and lighting an HCU fault lamp.
3. The method for controlling the electronic vacuum pump for the new energy vehicle according to claim 2, characterized in that: step A, an electronic vacuum pump opening threshold = basic opening threshold + opening threshold value increment 1; the closing threshold of the electronic vacuum pump = basic closing threshold + increasing amount of closing threshold value 1; the table can be looked up according to the vehicle speed to obtain a basic vacuum pressure opening and closing threshold value; and looking up a table according to the environmental pressure to obtain the increment 1 of the opening and closing threshold values of the vacuum pressure.
4. The method for controlling the electronic vacuum pump for the new energy vehicle according to claim 2, characterized in that: step A, the electronic vacuum pump is started and simultaneously meets the following conditions:
a1, a key door is On (or Start) or the absolute value of the vehicle speed is more than or equal to 2km/h;
a2, the value of the vacuum pressure sensor is more than or equal to an opening threshold;
the electronic vacuum pump is shut down to meet any one of the following conditions:
a3, the key door is OFF (or ACC) and the absolute value of the vehicle speed is <2km/h;
a4, the value of the vacuum pressure sensor is less than or equal to a closing threshold.
5. The method for controlling the electronic vacuum pump for the new energy vehicle according to claim 2, wherein in the step B, the specific steps of detecting air leakage, exiting air leakage, recovering air leakage fault, detecting vacuum system failure, exiting vacuum system failure and recovering vacuum system failure are as follows:
detecting air leakage judging conditions, wherein the following conditions are simultaneously met:
b1, the electronic vacuum pump is not started;
b2, braking is not stepped on;
b3, the vacuum pressure change rate is more than 10hpa/s and exceeds 5s;
exiting the air leakage judgment condition, wherein any one of the following conditions is met:
b4, starting an electronic vacuum pump;
b5, stepping on the brake;
b6, the vacuum pressure change rate is less than or equal to 10hpa/s;
and (3) air leakage fault recovery conditions, wherein the following conditions are simultaneously met:
b7, braking is not stepped on;
b8, the electronic vacuum pump does not work;
b9, vacuum pressure < -30kPa;
b10, the slope of the vacuum degree is less than or equal to 8hpa/s and exceeds 2s;
detecting failure judgment conditions of the vacuum system, wherein the following conditions are simultaneously met:
b11, starting an electronic vacuum pump;
b12, braking is not stepped on;
b13, the vacuum pressure exceeding 25s is still not less than the closing threshold;
the condition for judging the failure of the vacuum system is as follows: the electronic vacuum pump is turned off or brakes are stepped on;
the vacuum system failure recovery conditions are as follows: and when the vacuum pressure is smaller than a closing threshold, and two faults of air leakage and vacuum system failure are identified, the electronic vacuum pump is controlled according to a brake switch, an HCU fault lamp =2 is turned on, the vehicle speed is limited, and CC/ACC is forbidden.
6. The method for controlling the electronic vacuum pump for the new energy vehicle according to claim 2, wherein in step C, when the brake switch signal =1, the electronic vacuum pump is pumped for 10s and stopped for 2s; when the brake switch signal goes from 1 to 0, the electronic vacuum pump pumps for 10s.
7. The method for controlling the electronic vacuum pump for the new energy vehicle according to claim 2, wherein in step D, the brake switch signal =1 is allowed to be turned on.
8. The method for controlling the electronic vacuum pump for the new energy vehicle according to claim 7, characterized in that: the slope of the increase of the count when the electronic vacuum pump is started is c0=1, namely the count of 0.01s is increased by 1; the decline slope when the electronic vacuum pump was turned off was c1=0.33, i.e. 0.01s count increase-0.33; the upper limit of the locking count of the electronic vacuum pump is LockThreshold =42000, namely protection is carried out after 7 minutes of accumulative work; the lower limit of the electronic vacuum pump unlock count is UnLockThreshold =40000, i.e. the overheat recovery lockout requires the electronic vacuum pump to be stopped for 60s.
9. The method as claimed in claim 2, wherein in step E, when the service life of the EVP reaches, the number of running times is 120 ten thousand, the running time is 1500h, a fault code is recorded, and an HCU fault lamp =1 is turned on.
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Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01178070A (en) * 1988-01-09 1989-07-14 Nippon Denso Co Ltd Vacuum motor pump motor controller
US5350224A (en) * 1992-10-09 1994-09-27 Mercedes-Benz Ag Brake-pressure control device for a road vehicle
JPH1148958A (en) * 1997-07-31 1999-02-23 Jidosha Kiki Co Ltd Abnormality detector for hydraulic pressure brake booster system
CN102815288A (en) * 2011-06-10 2012-12-12 北汽福田汽车股份有限公司 Electronic vacuum pump control device, vacuum boosting system and vacuum boosting method
US20160264119A1 (en) * 2013-10-21 2016-09-15 Renault S.A.S. Management of the differential pressure thresholds of a vacuum pump connected to the braking system of a motor vehicle
CN107458364A (en) * 2017-07-20 2017-12-12 北京新能源汽车股份有限公司 Brake boosting system control method and device
CN108773368A (en) * 2018-04-24 2018-11-09 上海思致汽车工程技术有限公司 A kind of auto electronic vacuum method for controlling pump automatically adjusted with height above sea level
CN208498465U (en) * 2018-06-21 2019-02-15 安徽华菱汽车有限公司 A kind of electronic transport van type brake system of car
CN109823328A (en) * 2019-01-25 2019-05-31 重庆长安汽车股份有限公司 The control method and computer readable storage medium of electronic vacuum pump
CN109878485A (en) * 2019-04-03 2019-06-14 厦门金龙联合汽车工业有限公司 Electric car service brake force aid system and its control strategy and method for diagnosing faults
CN111267810A (en) * 2020-03-05 2020-06-12 上海中科深江电动车辆有限公司 Method for realizing working state control aiming at new energy vehicle brake vacuum pump and corresponding system
CN111409617A (en) * 2020-03-17 2020-07-14 浙江吉智新能源汽车科技有限公司 Electric vacuum pump overheating protection control method, system and terminal
CN113071470A (en) * 2021-05-08 2021-07-06 东风汽车集团股份有限公司 Working time prediction system and method for electric automobile brake vacuum pump
CN113232640A (en) * 2021-05-31 2021-08-10 重庆长安汽车股份有限公司 Vacuum failure auxiliary brake control system of electric automobile
CN113353051A (en) * 2021-06-30 2021-09-07 奇瑞商用车（安徽）有限公司 Electric vacuum pump control method and system and electric automobile
CN113670511A (en) * 2021-08-13 2021-11-19 宁波爱发科真空技术有限公司 Vacuum calibration system and detection method thereof
CN114043979A (en) * 2021-12-16 2022-02-15 东风汽车集团股份有限公司 Fault diagnosis and post-processing method and system for brake vacuum pump of electric automobile

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01178070A (en) * 1988-01-09 1989-07-14 Nippon Denso Co Ltd Vacuum motor pump motor controller
US5350224A (en) * 1992-10-09 1994-09-27 Mercedes-Benz Ag Brake-pressure control device for a road vehicle
JPH1148958A (en) * 1997-07-31 1999-02-23 Jidosha Kiki Co Ltd Abnormality detector for hydraulic pressure brake booster system
CN102815288A (en) * 2011-06-10 2012-12-12 北汽福田汽车股份有限公司 Electronic vacuum pump control device, vacuum boosting system and vacuum boosting method
US20160264119A1 (en) * 2013-10-21 2016-09-15 Renault S.A.S. Management of the differential pressure thresholds of a vacuum pump connected to the braking system of a motor vehicle
CN107458364A (en) * 2017-07-20 2017-12-12 北京新能源汽车股份有限公司 Brake boosting system control method and device
CN108773368A (en) * 2018-04-24 2018-11-09 上海思致汽车工程技术有限公司 A kind of auto electronic vacuum method for controlling pump automatically adjusted with height above sea level
CN208498465U (en) * 2018-06-21 2019-02-15 安徽华菱汽车有限公司 A kind of electronic transport van type brake system of car
CN109823328A (en) * 2019-01-25 2019-05-31 重庆长安汽车股份有限公司 The control method and computer readable storage medium of electronic vacuum pump
CN109878485A (en) * 2019-04-03 2019-06-14 厦门金龙联合汽车工业有限公司 Electric car service brake force aid system and its control strategy and method for diagnosing faults
CN111267810A (en) * 2020-03-05 2020-06-12 上海中科深江电动车辆有限公司 Method for realizing working state control aiming at new energy vehicle brake vacuum pump and corresponding system
CN111409617A (en) * 2020-03-17 2020-07-14 浙江吉智新能源汽车科技有限公司 Electric vacuum pump overheating protection control method, system and terminal
CN113071470A (en) * 2021-05-08 2021-07-06 东风汽车集团股份有限公司 Working time prediction system and method for electric automobile brake vacuum pump
CN113232640A (en) * 2021-05-31 2021-08-10 重庆长安汽车股份有限公司 Vacuum failure auxiliary brake control system of electric automobile
CN113353051A (en) * 2021-06-30 2021-09-07 奇瑞商用车（安徽）有限公司 Electric vacuum pump control method and system and electric automobile
CN113670511A (en) * 2021-08-13 2021-11-19 宁波爱发科真空技术有限公司 Vacuum calibration system and detection method thereof
CN114043979A (en) * 2021-12-16 2022-02-15 东风汽车集团股份有限公司 Fault diagnosis and post-processing method and system for brake vacuum pump of electric automobile

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
祝浩等: "电动汽车制动真空助力系统真空度值可信度故障检测方法研究", 《汽车科技》, pages 17 - 25 *
韩厚禄: "EV车制动真空助力系统设计", 《天津科技》, pages 65 - 68 *

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