CN109878485B - Electric automobile service brake booster system, control strategy and fault diagnosis method thereof - Google Patents
Electric automobile service brake booster system, control strategy and fault diagnosis method thereof Download PDFInfo
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- CN109878485B CN109878485B CN201910267310.2A CN201910267310A CN109878485B CN 109878485 B CN109878485 B CN 109878485B CN 201910267310 A CN201910267310 A CN 201910267310A CN 109878485 B CN109878485 B CN 109878485B
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000011217 control strategy Methods 0.000 title claims abstract description 16
- 238000012545 processing Methods 0.000 claims description 24
- 238000011084 recovery Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 description 8
- 238000005070 sampling Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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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
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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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
- 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
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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
- 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
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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 service brake booster system of an electric automobile, which comprises a brake pedal switch, a vacuum pressure sensor, a whole automobile controller, an atmospheric pressure sensor, an electric vacuum pump, a relay group and a storage battery pack, wherein the whole automobile controller is respectively in control connection with the brake pedal switch, the atmospheric pressure sensor, the vacuum pressure sensor and the electric vacuum pump, the storage battery pack is electrically connected with the electric vacuum pump through the relay group, the relay group comprises two common relays and a standby relay which are arranged in parallel, and the two relays are respectively in control connection with the whole automobile controller. The invention also discloses a control strategy and a fault diagnosis method of the electric automobile service brake booster system. According to the invention, through collecting data such as atmospheric pressure, system vacuum pressure, a brake switch and the like, an electric vacuum pump control strategy meeting the driving brake assistance of the whole vehicle is prepared, the driving control requirement of the electric vehicle is better met, and a set of more effective driving fault warning strategy is formed.
Description
Technical Field
The invention relates to the field of new energy automobile control systems, in particular to a service brake booster system of an electric automobile, a control strategy and a fault diagnosis method thereof.
Background
The existing principle of the fuel automobile brake vacuum assistance is to utilize the pressure difference between the negative pressure and the atmospheric pressure generated during the operation of an engine to generate a brake assistance effect so as to lighten the force applied to a brake pedal. However, the electric vehicle works by adopting an electric vacuum pump, which brings about some problems including:
(1) stopping working when the vacuum degree meets the system requirement, and starting working when the vacuum degree is insufficient;
(2) due to the current industry horizontal life problem of relays;
(3) the electric vacuum pump can achieve different vacuum degrees at different altitudes;
(4) the service brake booster system gives an alarm without faults;
therefore, in practical need, there is a need to provide a new service brake booster system to solve the above problems.
Disclosure of Invention
The invention discloses a service brake booster system of an electric automobile, a control strategy and a fault diagnosis method thereof, and aims to overcome the defects and the shortcomings in the prior art.
The technical scheme adopted by the invention is as follows:
the electric automobile service brake booster system comprises a brake pedal switch, a vacuum pressure sensor, a whole automobile controller, an atmospheric pressure sensor, an electric vacuum pump, a relay group and a storage battery pack, wherein the whole automobile controller is respectively in control connection with the brake pedal switch, the atmospheric pressure sensor, the vacuum pressure sensor and the electric vacuum pump; the electric vacuum pump is connected with the vacuum air storage tank, and the vacuum pressure sensor is used for monitoring the pressure of the vacuum air storage tank in real time.
Furthermore, an insurance resistor is also connected between the storage battery and the relay group.
Still further, the battery is a 12V battery.
A control strategy and fault diagnosis method of a service brake booster system of an electric automobile comprises the following specific steps:
step 1: judging and processing the input signal: the input signal includes: the vehicle controller pre-judges and processes the input signals;
step 2: control of the electric vacuum pump: the whole vehicle controller controls the electric vacuum pump and performs fault diagnosis of the electric vacuum pump;
step 3: control of the relay: the whole vehicle controller controls the relay and diagnoses the fault of the relay;
step 4: detection and fault diagnosis of the vacuum pressure sensor: the whole vehicle controller controls the vacuum pressure sensor and performs fault diagnosis of the vacuum pressure sensor.
Furthermore, the pre-breaking and processing of each input signal by the whole vehicle controller in the step 1 includes: and judging the altitude of the vehicle according to signals input by the atmospheric pressure sensor, and judging and setting each working threshold value.
Furthermore, the step 2 of controlling the electric vacuum pump by the vehicle controller comprises the following specific modes:
A. judging effective working conditions, and if the vacuum system is in a charging state, invalidating the vacuum system; if the key is in the ON gear, the vacuum system is effective no matter what state the vehicle is in; if the key is in an OFF gear and the power-assisting system is in a power-down time delay state, the vacuum system is effective;
B. when the key is firstly turned ON to the ON gear, if the current vacuum degree is detected to be larger than the pump stopping threshold value, the electric vacuum pump is started until the pump stopping threshold value is reached;
C. and if the current vacuum degree is detected to be larger than the set pump opening threshold value, the electric vacuum pump is started until the pump stopping threshold value is reached.
Further, the fault diagnosis of the electric vacuum pump by the whole vehicle controller in the step 2 includes the following specific modes:
A. an initial low vacuum warning: after the first power-on, if the vacuum degree is smaller than the set vacuum degree too low threshold value, an initial vacuum degree too low warning is sent out, fault processing is reported, and the automatic recovery is carried out after the fault is eliminated;
B. warning of excessive vacuum: after power-on, when the vacuum degree is monitored to be higher than a set alarm threshold value, an excessive vacuum degree alarm is sent out, and fault processing is reported, and the automatic recovery is carried out after the fault is eliminated;
C. slight leakage failure of the gas path: when no braking signal exists, and lasting for 6 seconds, when the vacuum pressure value of the air channel rises to a set slight leakage threshold value, a slight leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the vehicle is automatically recovered after the fault is eliminated;
D. moderate leakage fault of gas circuit: when no braking signal exists and the vacuum pressure value of the air channel is continuously increased to a set moderate leakage threshold value for 6 seconds, or when no braking signal exists and the vacuum pressure value of the electric vacuum pump continuously works for 6 seconds and the vacuum pressure value of the air channel is reduced to a value smaller than 0, a moderate leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the vehicle is automatically recovered after the fault is eliminated;
E. gas path height leakage failure: when no braking signal exists and the vacuum pressure value of the air channel rises to a set height leakage threshold value for 6 seconds, the height leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the power is supplied again after the fault is eliminated;
F. the single working time length exceeds the limit: when the working time of the electric vacuum pump exceeds the set longest working time T, and meanwhile, the electric vacuum pump is not closed, a single working time over-limit fault is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, the electric vacuum pump is forcedly stopped to work for 7s, and the electric vacuum pump is powered on again after the fault is eliminated.
Furthermore, in the step 3, the whole vehicle controller performs control work and fault diagnosis on the relay, and the method comprises the following specific modes:
A. and (3) performing adhesion detection: when the relay is in a disconnection state, the power assisting system detects whether the voltage of a sampling point of the relay is at a high level, and if the voltage is at the high level, the relay adhesion fault is reported;
B. when a key is firstly put into an ON gear, the power assisting system only closes the standby relay and detects whether the voltage of a sampling point of the relay is at a high level, if not, the standby relay is reported to be faulty; if the voltage is at the high level, closing the common relay after timing for 1s, timing for 0.5s after closing the common relay, opening the standby relay, detecting whether the voltage of a relay sampling point is at the high level, and reporting a 'common relay fault' if the voltage is not at the high level;
C. if the key is not in the ON gear for the first time, the power assisting system closes the common relay and detects whether the voltage of a sampling point of the relay is in a high level or not when the electric vacuum pump reaches an opening condition, if the high level is not detected by a closing instruction for 0.5s, the states of the common relay and the standby relay are interchanged and a common relay fault is reported;
D. when the system control instruction is to close the vacuum pump relay, but the relay is detected to be not closed, the two-way relay fault is sent out, the fault is reported, meanwhile, the speed is limited, and the power is supplied again after the fault is eliminated;
E. the service life of the relay 1 is early-warned, when the whole vehicle controller detects that the use times of the single-circuit relay reach a maintenance set value, the service life of the relay 1 is early-warned, and after maintenance, specific software is used for resetting;
F. and (3) carrying out life early warning on the relay 2, and when the whole vehicle controller detects that the use times of the single-way relay reach the maintenance set value, sending out life early warning on the relay 2, and resetting by using specific software after maintenance.
Furthermore, in the step 4, the vehicle controller performs control work and fault diagnosis on the vacuum pressure sensor, and the method comprises the following specific modes:
A. failure of the vacuum pressure sensor: when the pressure sensor signal is not detected, a vacuum pressure sensor failure fault is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to stop 7 seconds of circulation according to 7 seconds of work, the highest speed is limited, and the automatic recovery is realized after the fault is eliminated;
B. vacuum pressure sensor anomaly: when the pressure value of the vacuum pressure sensor is detected to be smaller than the minimum threshold value or larger than the maximum threshold value, an abnormal fault of the vacuum pressure sensor is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to stop 7 seconds of circulation according to 7 seconds of work, the highest vehicle speed is limited, and the automatic recovery is realized after the fault is eliminated.
Further, when the vacuum pressure sensor fails and the vacuum pressure sensor is abnormal in an over-voltage state, the vacuum pressure sensor fails preferentially to the vacuum pressure sensor.
As can be seen from the above description of the present invention, the present invention has the following advantages compared with the prior art:
1. according to the invention, through collecting data such as atmospheric pressure, system vacuum pressure, a brake switch and the like, an electric vacuum pump control strategy meeting the driving brake assistance of the whole vehicle is prepared, the driving control requirement of the electric vehicle is better met, and a set of more effective driving fault warning strategy is formed.
2. The invention can meet the use mileage of 30 ten thousand kilometers of a vehicle for 3 years by setting a scheme of a double-relay circuit and a relay alarm strategy, and solves the technical problem of low average service life of the relay in the industry.
3. According to the invention, by adding the atmospheric pressure sensor and the vacuum system pressure sensor and combining the control strategy of the electric vacuum pump, the traveling crane in different elevation areas can be solved, so that the electric automobile can be popularized and applied more widely.
4. The invention develops a more effective system fault alarm strategy through circuit signal detection, and solves the defects of the existing driving control system.
5. The invention integrates the controller into the whole vehicle controller, replaces an independent electric vacuum pump controller, has more reasonable structure and more optimized control effect.
Drawings
Fig. 1 is a schematic diagram of the frame principle structure of the present invention.
Detailed Description
Specific embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the electric automobile service brake booster system comprises a brake pedal switch, a vacuum pressure sensor, a whole vehicle controller, an atmospheric pressure sensor, an electric vacuum pump, a relay group and a storage battery pack, wherein the whole vehicle controller is respectively in control connection with the brake pedal switch, the atmospheric pressure sensor, the vacuum pressure sensor and the electric vacuum pump, the storage battery pack is electrically connected with the electric vacuum pump through the relay group, the relay group comprises two common relays and a standby relay which are arranged in parallel, and the two relays are respectively in control connection with the whole vehicle controller; the electric vacuum pump is connected with the vacuum air storage tank, and the vacuum pressure sensor is used for monitoring the pressure of the vacuum air storage tank in real time.
Furthermore, an insurance resistor is also connected between the storage battery and the relay group.
Still further, the battery is a 12V battery.
A control strategy and fault diagnosis method of a service brake booster system of an electric automobile comprises the following specific steps:
step 1: judging and processing the input signal: the input signal includes: the vehicle controller pre-judges and processes the input signals;
step 2: control of the electric vacuum pump: the whole vehicle controller controls the electric vacuum pump and performs fault diagnosis of the electric vacuum pump;
step 3: control of the relay: the whole vehicle controller controls the relay and diagnoses the fault of the relay;
step 4: detection and fault diagnosis of the vacuum pressure sensor: the whole vehicle controller controls the vacuum pressure sensor and performs fault diagnosis of the vacuum pressure sensor.
Furthermore, the pre-breaking and processing of each input signal by the whole vehicle controller in the step 1 includes: and judging the altitude of the vehicle according to signals input by the atmospheric pressure sensor, and judging and setting each working threshold value.
Furthermore, the step 2 of controlling the electric vacuum pump by the vehicle controller comprises the following specific modes:
A. judging effective working conditions, and if the vacuum system is in a charging state, invalidating the vacuum system; if the key is in the ON gear, the vacuum system is effective no matter what state the vehicle is in; if the key is in an OFF gear and the power-assisting system is in a power-down time delay state, the vacuum system is effective;
B. when the key is firstly turned ON to the ON gear, if the current vacuum degree is detected to be larger than the pump stopping threshold value, the electric vacuum pump is started until the pump stopping threshold value is reached;
C. and if the current vacuum degree is detected to be larger than the set pump opening threshold value, the electric vacuum pump is started until the pump stopping threshold value is reached.
Further, the fault diagnosis of the electric vacuum pump by the whole vehicle controller in the step 2 includes the following specific modes:
A. an initial low vacuum warning: after the first power-on, if the vacuum degree is smaller than the set vacuum degree too low threshold value, an initial vacuum degree too low warning is sent out, fault processing is reported, and the automatic recovery is carried out after the fault is eliminated;
B. warning of excessive vacuum: after power-on, when the vacuum degree is monitored to be higher than a set alarm threshold value, an excessive vacuum degree alarm is sent out, and fault processing is reported, and the automatic recovery is carried out after the fault is eliminated;
C. slight leakage failure of the gas path: when no braking signal exists, and lasting for 6 seconds, when the vacuum pressure value of the air channel rises to a set slight leakage threshold value, a slight leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the vehicle is automatically recovered after the fault is eliminated;
D. moderate leakage fault of gas circuit: when no braking signal exists and the vacuum pressure value of the air channel is continuously increased to a set moderate leakage threshold value for 6 seconds, or when no braking signal exists and the vacuum pressure value of the electric vacuum pump continuously works for 6 seconds and the vacuum pressure value of the air channel is reduced to a value smaller than 0, a moderate leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the vehicle is automatically recovered after the fault is eliminated;
E. gas path height leakage failure: when no braking signal exists and the vacuum pressure value of the air channel rises to a set height leakage threshold value for 6 seconds, the height leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the power is supplied again after the fault is eliminated;
F. the single working time length exceeds the limit: when the working time of the electric vacuum pump exceeds the set longest working time T, and meanwhile, the electric vacuum pump is not closed, a single working time over-limit fault is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, the electric vacuum pump is forcedly stopped to work for 7s, and the electric vacuum pump is powered on again after the fault is eliminated.
The following table is a working threshold table of the electric vacuum pump at different altitudes:
furthermore, in the step 3, the whole vehicle controller performs control work and fault diagnosis on the relay, and the method comprises the following specific modes:
A. and (3) performing adhesion detection: when the relay is in a disconnection state, the power assisting system detects whether the voltage of a sampling point of the relay is at a high level, and if the voltage is at the high level, the relay adhesion fault is reported;
B. when a key is firstly put into an ON gear, the power assisting system only closes the standby relay and detects whether the voltage of a sampling point of the relay is at a high level, if not, the standby relay is reported to be faulty; if the voltage is at the high level, closing the common relay after timing for 1s, timing for 0.5s after closing the common relay, opening the standby relay, detecting whether the voltage of a relay sampling point is at the high level, and reporting a 'common relay fault' if the voltage is not at the high level;
C. if the key is not in the ON gear for the first time, the power assisting system closes the common relay and detects whether the voltage of a sampling point of the relay is in a high level or not when the electric vacuum pump reaches an opening condition, if the high level is not detected by a closing instruction for 0.5s, the states of the common relay and the standby relay are interchanged and a common relay fault is reported;
D. when the system control instruction is to close the vacuum pump relay, but the relay is detected to be not closed, the two-way relay fault is sent out, the fault is reported, meanwhile, the speed is limited, and the power is supplied again after the fault is eliminated;
E. the service life of the relay 1 is early-warned, when the whole vehicle controller detects that the use times of the single-circuit relay reach a maintenance set value, the service life of the relay 1 is early-warned, and after maintenance, specific software is used for resetting;
F. and (3) carrying out life early warning on the relay 2, and when the whole vehicle controller detects that the use times of the single-way relay reach the maintenance set value, sending out life early warning on the relay 2, and resetting by using specific software after maintenance.
Furthermore, in the step 4, the vehicle controller performs control work and fault diagnosis on the vacuum pressure sensor, and the method comprises the following specific modes:
A. failure of the vacuum pressure sensor: when the pressure sensor signal is not detected, a vacuum pressure sensor failure fault is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to stop 7 seconds of circulation according to 7 seconds of work, the highest speed is limited, and the automatic recovery is realized after the fault is eliminated;
B. vacuum pressure sensor anomaly: when the pressure value of the vacuum pressure sensor is detected to be smaller than the minimum threshold value or larger than the maximum threshold value, an abnormal fault of the vacuum pressure sensor is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to stop 7 seconds of circulation according to 7 seconds of work, the highest vehicle speed is limited, and the automatic recovery is realized after the fault is eliminated.
Further, when the vacuum pressure sensor fails and the vacuum pressure sensor is abnormal in an over-voltage state, the vacuum pressure sensor fails preferentially to the vacuum pressure sensor.
1. According to the invention, through collecting data such as atmospheric pressure, system vacuum pressure, a brake switch and the like, an electric vacuum pump control strategy meeting the driving brake assistance of the whole vehicle is prepared, the driving control requirement of the electric vehicle is better met, and a set of more effective driving fault warning strategy is formed.
2. The invention can meet the use mileage of 30 ten thousand kilometers of a vehicle for 3 years by setting a scheme of a double-relay circuit and a relay alarm strategy, and solves the technical problem of low average service life of the relay in the industry.
3. According to the invention, by adding the atmospheric pressure sensor and the vacuum system pressure sensor and combining the control strategy of the electric vacuum pump, the traveling crane in different elevation areas can be solved, so that the electric automobile can be popularized and applied more widely.
4. The invention develops a more effective system fault alarm strategy through circuit signal detection, and solves the defects of the existing driving control system.
5. The invention integrates the controller into the whole vehicle controller, replaces an independent electric vacuum pump controller, has more reasonable structure and more optimized control effect.
The foregoing is merely illustrative of specific embodiments of the present invention, and the design concept of the present invention is not limited thereto, and any insubstantial modifications made by the present invention shall fall within the scope of the present invention.
Claims (4)
1. A control strategy and fault diagnosis method of a service brake booster system of an electric automobile are characterized in that: the method comprises the following specific steps:
step 1: judging and processing the input signal: the input signal includes: the vehicle controller pre-judges and processes the input signals;
step 2: control of the electric vacuum pump: the whole vehicle controller controls the electric vacuum pump and performs fault diagnosis of the electric vacuum pump; the fault diagnosis of the electric vacuum pump comprises the following specific modes:
A. an initial low vacuum warning: after the first power-on, if the vacuum degree is lower than a set vacuum degree too low threshold value, an initial vacuum degree too low warning is sent out, fault processing is reported, and the automatic recovery is carried out after the fault is eliminated;
B. warning of excessive vacuum: after power-on, when the vacuum degree is monitored to be higher than a set alarm threshold value, an excessive vacuum degree alarm is sent out, and fault processing is reported, and the automatic recovery is carried out after the fault is eliminated;
C. slight leakage failure of the gas path: when no braking signal exists, and lasting for 6 seconds, when the vacuum pressure value of the air channel rises to a set slight leakage threshold value, a slight leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the vehicle is automatically recovered after the fault is eliminated;
D. moderate leakage fault of gas circuit: when no braking signal exists and the vacuum pressure value of the air channel is continuously increased to a set moderate leakage threshold value for 6 seconds, or when no braking signal exists and the vacuum pressure value of the electric vacuum pump continuously works for 6 seconds and the vacuum pressure value of the air channel is reduced to a value smaller than 0, a moderate leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the vehicle is automatically recovered after the fault is eliminated;
E. gas path height leakage failure: when no braking signal exists and the vacuum pressure value of the air channel rises to a set height leakage threshold value for 6 seconds, the height leakage fault of the air channel is sent out, fault processing is reported, meanwhile, the highest vehicle speed is limited, and the power is supplied again after the fault is eliminated;
F. the single working time length exceeds the limit: when the working time of the electric vacuum pump exceeds the set maximum working time T, a single working time period overrun fault is sent out, fault processing is reported, meanwhile, the maximum speed is limited, the electric vacuum pump is forcedly stopped for 7s, and the electric vacuum pump is powered on again after the fault is eliminated;
step 3: control of the relay: the whole vehicle controller controls the relay and diagnoses the fault of the relay;
step 4: detection and fault diagnosis of the vacuum pressure sensor: the whole vehicle controller controls the vacuum pressure sensor and performs fault diagnosis of the vacuum pressure sensor.
2. The control strategy and fault diagnosis method for a service brake booster system of an electric vehicle according to claim 1, wherein: in the step 1, the pre-judging and processing of each input signal by the whole vehicle controller includes: and judging the altitude of the vehicle according to signals input by the atmospheric pressure sensor, and judging and setting each working threshold value.
3. The control strategy and fault diagnosis method for a service brake booster system of an electric vehicle according to claim 1, wherein: in the step 2, the control work of the electric vacuum pump by the whole vehicle controller comprises the following specific modes:
A. judging effective working conditions, and if the vacuum system is in a charging state, invalidating the vacuum system; if the key is in the ON gear, the vacuum system is effective no matter what state the vehicle is in; if the key is in an OFF gear and the power-assisting system is in a power-down time delay state, the vacuum system is effective;
B. when the key is firstly turned ON to the ON gear, if the current vacuum degree is detected to be larger than the pump stopping threshold value, the electric vacuum pump is started until the pump stopping threshold value is reached;
C. and if the current vacuum degree is detected to be larger than the set pump opening threshold value, the electric vacuum pump is started until the pump stopping threshold value is reached.
4. The control strategy and fault diagnosis method for a service brake booster system of an electric vehicle according to claim 1, wherein: in the step 4, the whole vehicle controller performs control work and fault diagnosis on the vacuum pressure sensor, and the method comprises the following specific modes:
A. failure of the vacuum pressure sensor: when the vacuum pressure sensor signal is not detected, a failure fault of the vacuum pressure sensor is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to stop 7 seconds according to 7 seconds of work and cycle, the highest speed is limited, and the automatic recovery is realized after the fault is eliminated;
B. vacuum pressure sensor anomaly: when the pressure value of the vacuum pressure sensor is detected to be smaller than the minimum threshold value or larger than the maximum threshold value, an abnormal fault of the vacuum pressure sensor is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to stop 7 seconds according to 7 seconds of working, the highest vehicle speed is limited, and the automatic recovery is realized after the fault is eliminated.
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| CN201910267310.2A CN109878485B (en) | 2019-04-03 | 2019-04-03 | Electric automobile service brake booster system, control strategy and fault diagnosis method thereof |
| CN202311478733.1A CN117302152A (en) | 2019-04-03 | 2019-04-03 | Control diagnosis method for electric automobile service brake booster system |
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| CN110824224B (en) * | 2019-08-01 | 2021-12-07 | 中国第一汽车股份有限公司 | Detection device and detection method for electric power-assisted system of electric automobile |
| CN110435617A (en) * | 2019-08-22 | 2019-11-12 | 山东理工大学 | A kind of double electric vacuum pumps combination vacuum boost systems of brake of electric vehicle considering altitude environment |
| CN110525416A (en) * | 2019-08-30 | 2019-12-03 | 奇瑞商用车（安徽）有限公司 | A kind of vacuum system alarm method |
| CN111301383B (en) * | 2019-11-05 | 2021-05-28 | 浙江零跑科技有限公司 | Plateau-adaptive new energy vehicle vacuum pump control method |
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| CN117302152A (en) | 2023-12-29 |
| CN109878485A (en) | 2019-06-14 |
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