CN210027382U - Service brake boosting system of electric automobile - Google Patents
Service brake boosting system of electric automobile Download PDFInfo
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- CN210027382U CN210027382U CN201920445717.5U CN201920445717U CN210027382U CN 210027382 U CN210027382 U CN 210027382U CN 201920445717 U CN201920445717 U CN 201920445717U CN 210027382 U CN210027382 U CN 210027382U
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Abstract
The utility model discloses an electric automobile service brake helping hand system, including brake pedal switch, vacuum pressure sensor, vehicle control unit, atmospheric pressure sensor, electric vacuum pump, relay group and storage battery, vehicle control unit respectively with brake pedal switch, atmospheric pressure sensor, vacuum pressure sensor and electric vacuum pump control mutually and be connected the setting, storage battery passes through the relay group and is connected with the electric vacuum pump electricity, relay group includes two parallelly connected relays commonly used and the stand-by relay who sets up, two relays respectively with vehicle control unit looks control connection. The utility model discloses a data such as collection atmospheric pressure, system vacuum pressure and brake switch make the electric vacuum pump control strategy that satisfies whole car service brake helping hand, satisfy electric automobile's driving control requirement better to form one set of more effectual driving trouble and report an emergency and ask for help or increased vigilance the tactics.
Description
Technical Field
The utility model relates to a new energy automobile control system field, the more specifically electric automobile service brake helping hand system that says so.
Background
The brake vacuum boosting principle of the existing fuel automobile is that the pressure difference between negative pressure generated when an engine works and atmospheric pressure is utilized to generate the brake boosting effect so as to reduce the force applied to a brake pedal. Electric vehicles, which operate using an electric vacuum pump, have 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-level life problems of relays;
③ the electric vacuum pump can reach different vacuum degrees at different altitudes;
④ warning no fault in service brake boosting system;
therefore, there is a need to provide a new service brake boosting system to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an electric automobile service brake helping hand system, its main aim at overcome the above-mentioned not enough and shortcoming that prior art exists.
The utility model adopts the technical scheme as follows:
a driving brake power-assisted system of an electric automobile comprises a brake pedal switch, a vacuum pressure sensor, a vehicle control unit, an atmospheric pressure sensor, an electric vacuum pump, a relay group and a storage battery pack, wherein the vehicle control unit 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 gas storage tank, and the vacuum pressure sensor is used for monitoring the pressure of the vacuum gas storage tank in real time.
Furthermore, an insurance resistor is connected between the storage battery and the relay group.
Further, the battery is a 12V battery.
A control strategy and fault diagnosis method for a service brake boosting system of an electric automobile comprises the following specific steps:
step 1: judging and processing an input signal: the input signal includes: the whole vehicle controller carries out pre-judgment and processing on each input signal;
step 2: control of the electric vacuum pump: the vehicle control unit controls the electric vacuum pump to work and carries out fault diagnosis on the electric vacuum pump;
and step 3: controlling the relay: the vehicle control unit controls the relay and performs fault diagnosis on the relay;
and 4, step 4: detection and fault diagnosis of the vacuum pressure sensor: and the vehicle control unit controls the vacuum pressure sensor and diagnoses the fault of the vacuum pressure sensor.
Furthermore, the pre-interrupting and processing of each input signal by the vehicle control unit in step 1 includes: and judging the altitude of the vehicle according to the signal input by the atmospheric pressure sensor, and judging and setting each working threshold.
Furthermore, the step 2 of controlling the electric vacuum pump by the vehicle control unit includes the following specific steps:
A. judging effective working conditions, and if the vacuum system is in a charging state, the vacuum system is invalid; if the key is turned to the ON gear, the vacuum system is effective no matter what state the vehicle is in; if the key is turned to the OFF gear, and the power assisting system is in a power-OFF delay state, the vacuum system is effective;
B. when a key is turned to an ON gear for the first time, if the current vacuum degree is detected to be greater than a pump stopping threshold value, starting the electric vacuum pump until the current vacuum degree reaches the pump stopping threshold value, and closing the electric vacuum pump;
C. and (3) if the vehicle normally runs and the current vacuum degree is detected to be greater than the set pump starting threshold value, starting the electric vacuum pump until the current vacuum degree reaches the pump stopping threshold value, and closing the electric vacuum pump.
Furthermore, the fault diagnosis of the vehicle control unit on the electric vacuum pump in the step 2 includes the following specific modes:
A. warning of low initial vacuum: after the power is firstly powered on, if the vacuum degree is smaller than the set vacuum degree over-low threshold value, sending an initial vacuum degree over-low warning, reporting fault processing, and automatically recovering 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, a warning of over-high vacuum degree is sent out, fault processing is reported, and automatic recovery is carried out after the fault is eliminated;
C. slight leakage fault of gas circuit: when no braking signal exists and the pressure continues for 6s, when the vacuum pressure value of the air path rises to a set slight leakage threshold value, a slight leakage fault of the air path is sent out, fault processing is reported, meanwhile, the speed limit is carried out on the highest vehicle speed, and the fault is automatically recovered after being eliminated;
D. moderate leakage fault in gas circuit: when no braking signal exists and the pressure value of the vacuum of the air path is continuously 6s, and the set moderate leakage threshold value is increased, or when no braking signal exists and the electric vacuum pump continuously works for 6s, and the drop value of the vacuum pressure value of the air path is less than 0, sending out the moderate leakage fault of the air path, reporting the fault to process, limiting the speed of the highest vehicle speed, and automatically recovering after the fault is eliminated;
E. gas path height leakage failure: when no braking signal exists and the pressure value of the vacuum of the air path rises to a set height leakage threshold value for 6 seconds continuously, sending out an air path height leakage fault, reporting fault processing, limiting the speed of the highest vehicle speed, and electrifying again after the fault is eliminated;
F. the single working time exceeds the limit: and when the working time of the electric vacuum pump exceeds the set maximum working time T and the electric vacuum pump is not turned off, sending out an overrun fault in single working time, reporting fault processing, limiting the maximum speed, forcibly stopping the electric vacuum pump for 7s, and electrifying again after the fault is eliminated.
Furthermore, the control work and fault diagnosis of the vehicle control unit on the relay in the step 3 include the following specific modes:
A. and (3) carrying out adhesion detection: when the relay is in a disconnected state, the power-assisted system detects whether the voltage of a sampling point of the relay is a high level, and if the voltage of the sampling point of the relay is the high level, an adhesion fault of the relay is reported;
B. when a key is turned to an ON gear for the first time, the power assisting system only closes the standby relay, detects whether the voltage of a sampling point of the relay is high level or not, and reports 'standby relay fault' if the voltage is not high level; if the voltage is high level, closing the common relay after timing for 1s, timing for 0.5s after the common relay is closed, disconnecting the standby relay, detecting whether the voltage of the sampling point of the relay is high level, and reporting 'common relay fault' if the voltage is not high level;
C. if the key is not turned ON for the first time, when the electric vacuum pump reaches an opening condition, the power assisting system closes the common relay, detects whether the voltage of a sampling point of the relay is a high level, and if a closing instruction continues for 0.5s and the high level is not detected, the states of the common relay and the standby relay are exchanged, and a common relay fault is reported;
D. when the system control instruction is to close the vacuum pump relay, but the relay is not closed, the two paths of vacuum pump relay faults are sent out, the faults are reported, meanwhile, the vehicle speed is limited, and the power is powered on again after the faults are eliminated;
E. the service life of the relay 1 is early-warned, when the vehicle control unit detects that the using times of the single-path relay reaches 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) early warning the service life of the relay 2, when the vehicle control unit detects that the using times of the single-path relay reaches a maintenance set value, sending out early warning the service life of the relay 2, and resetting by using specific software after maintenance.
Furthermore, the control work and fault diagnosis of the vehicle control unit on the vacuum pressure sensor in the step 4 comprise the following specific modes:
A. failure of the vacuum pressure sensor: when the signal of the pressure sensor 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 of circulation according to the working time of 7 seconds, the highest vehicle speed is limited, and the fault is automatically recovered after being eliminated;
B. vacuum pressure sensor abnormality: 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, the abnormal fault of the vacuum pressure sensor is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to work for 7 seconds and stop for 7 seconds, the highest vehicle speed is limited, and the fault is automatically recovered after being eliminated.
Further, when the vacuum pressure sensor fails and the vacuum pressure sensor is abnormal in the over-voltage state, the vacuum pressure sensor fails prior to the vacuum pressure sensor being abnormal.
Through the above-mentioned right the utility model discloses a description compares with prior art, the advantage of the utility model lies in:
1. the utility model discloses a data such as collection atmospheric pressure, system vacuum pressure and brake switch make the electric vacuum pump control strategy that satisfies whole car service brake helping hand, satisfy electric automobile's driving control requirement better to form one set of more effectual driving trouble and report an emergency and ask for help or increased vigilance the tactics.
2. The utility model discloses a scheme and relay warning strategy that set up two relay circuits can satisfy the use mileage of vehicle 3 years 30 kilometers, have solved the low technological problem of the average life of relay in the trade.
3. The utility model discloses an increase atmospheric pressure sensor and vacuum system pressure sensor, combine the control strategy of electric vacuum pump simultaneously, can solve the regional driving of different height above sea level and use to realize electric automobile's more extensive popularization and application.
4. The utility model discloses a circuit signal detects, formulates more effectual system fault and reports an emergency and asks for help or increased vigilance the tactics, solves the not enough that current driving control system exists.
5. The utility model discloses with controller integration to vehicle control unit, replaced independent electric vacuum pump controller, its structure is more reasonable, and control effect is more optimized.
Drawings
Fig. 1 is a schematic diagram of the frame principle structure of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a service braking power-assisted system of an electric vehicle comprises a brake pedal switch, a vacuum pressure sensor, a vehicle control unit, an atmospheric pressure sensor, an electric vacuum pump, a relay group and a storage battery pack, wherein the vehicle control unit is respectively connected with the brake pedal switch, the atmospheric pressure sensor, the vacuum pressure sensor and the electric vacuum pump in a control manner, 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 connected with the vehicle control unit in a control manner; the electric vacuum pump is connected with the vacuum gas storage tank, and the vacuum pressure sensor is used for monitoring the pressure of the vacuum gas storage tank in real time.
Furthermore, an insurance resistor is connected between the storage battery and the relay group.
Further, the battery is a 12V battery.
A control strategy and fault diagnosis method for a service brake boosting system of an electric automobile comprises the following specific steps:
step 1: judging and processing an input signal: the input signal includes: the whole vehicle controller carries out pre-judgment and processing on each input signal;
step 2: control of the electric vacuum pump: the vehicle control unit controls the electric vacuum pump to work and carries out fault diagnosis on the electric vacuum pump;
and step 3: controlling the relay: the vehicle control unit controls the relay and performs fault diagnosis on the relay;
and 4, step 4: detection and fault diagnosis of the vacuum pressure sensor: and the vehicle control unit controls the vacuum pressure sensor and diagnoses the fault of the vacuum pressure sensor.
Furthermore, the pre-interrupting and processing of each input signal by the vehicle control unit in step 1 includes: and judging the altitude of the vehicle according to the signal input by the atmospheric pressure sensor, and judging and setting each working threshold.
Furthermore, the step 2 of controlling the electric vacuum pump by the vehicle control unit includes the following specific steps:
A. judging effective working conditions, and if the vacuum system is in a charging state, the vacuum system is invalid; if the key is turned to the ON gear, the vacuum system is effective no matter what state the vehicle is in; if the key is turned to the OFF gear, and the power assisting system is in a power-OFF delay state, the vacuum system is effective;
B. when a key is turned to an ON gear for the first time, if the current vacuum degree is detected to be greater than a pump stopping threshold value, starting the electric vacuum pump until the current vacuum degree reaches the pump stopping threshold value, and closing the electric vacuum pump;
C. and (3) if the vehicle normally runs and the current vacuum degree is detected to be greater than the set pump starting threshold value, starting the electric vacuum pump until the current vacuum degree reaches the pump stopping threshold value, and closing the electric vacuum pump.
Furthermore, the fault diagnosis of the vehicle control unit on the electric vacuum pump in the step 2 includes the following specific modes:
A. warning of low initial vacuum: after the power is firstly powered on, if the vacuum degree is smaller than the set vacuum degree over-low threshold value, sending an initial vacuum degree over-low warning, reporting fault processing, and automatically recovering 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, a warning of over-high vacuum degree is sent out, fault processing is reported, and automatic recovery is carried out after the fault is eliminated;
C. slight leakage fault of gas circuit: when no braking signal exists and the pressure continues for 6s, when the vacuum pressure value of the air path rises to a set slight leakage threshold value, a slight leakage fault of the air path is sent out, fault processing is reported, meanwhile, the speed limit is carried out on the highest vehicle speed, and the fault is automatically recovered after being eliminated;
D. moderate leakage fault in gas circuit: when no braking signal exists and the pressure value of the vacuum of the air path is continuously 6s, and the set moderate leakage threshold value is increased, or when no braking signal exists and the electric vacuum pump continuously works for 6s, and the drop value of the vacuum pressure value of the air path is less than 0, sending out the moderate leakage fault of the air path, reporting the fault to process, limiting the speed of the highest vehicle speed, and automatically recovering after the fault is eliminated;
E. gas path height leakage failure: when no braking signal exists and the pressure value of the vacuum of the air path rises to a set height leakage threshold value for 6 seconds continuously, sending out an air path height leakage fault, reporting fault processing, limiting the speed of the highest vehicle speed, and electrifying again after the fault is eliminated;
F. the single working time exceeds the limit: and when the working time of the electric vacuum pump exceeds the set maximum working time T and the electric vacuum pump is not turned off, sending out an overrun fault in single working time, reporting fault processing, limiting the maximum speed, forcibly stopping the electric vacuum pump for 7s, and electrifying again after the fault is eliminated.
The following table is a table of working thresholds of the electric vacuum pump at different altitudes:
furthermore, the control work and fault diagnosis of the vehicle control unit on the relay in the step 3 include the following specific modes:
A. and (3) carrying out adhesion detection: when the relay is in a disconnected state, the power-assisted system detects whether the voltage of a sampling point of the relay is a high level, and if the voltage of the sampling point of the relay is the high level, an adhesion fault of the relay is reported;
B. when a key is turned to an ON gear for the first time, the power assisting system only closes the standby relay, detects whether the voltage of a sampling point of the relay is high level or not, and reports 'standby relay fault' if the voltage is not high level; if the voltage is high level, closing the common relay after timing for 1s, timing for 0.5s after the common relay is closed, disconnecting the standby relay, detecting whether the voltage of the sampling point of the relay is high level, and reporting 'common relay fault' if the voltage is not high level;
C. if the key is not turned ON for the first time, when the electric vacuum pump reaches an opening condition, the power assisting system closes the common relay, detects whether the voltage of a sampling point of the relay is a high level, and if a closing instruction continues for 0.5s and the high level is not detected, the states of the common relay and the standby relay are exchanged, and a common relay fault is reported;
D. when the system control instruction is to close the vacuum pump relay, but the relay is not closed, the two paths of vacuum pump relay faults are sent out, the faults are reported, meanwhile, the vehicle speed is limited, and the power is powered on again after the faults are eliminated;
E. the service life of the relay 1 is early-warned, when the vehicle control unit detects that the using times of the single-path relay reaches 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) early warning the service life of the relay 2, when the vehicle control unit detects that the using times of the single-path relay reaches a maintenance set value, sending out early warning the service life of the relay 2, and resetting by using specific software after maintenance.
Furthermore, the control work and fault diagnosis of the vehicle control unit on the vacuum pressure sensor in the step 4 comprise the following specific modes:
A. failure of the vacuum pressure sensor: when the signal of the pressure sensor 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 of circulation according to the working time of 7 seconds, the highest vehicle speed is limited, and the fault is automatically recovered after being eliminated;
B. vacuum pressure sensor abnormality: 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, the abnormal fault of the vacuum pressure sensor is sent out, the fault is reported, meanwhile, the electric vacuum pump is controlled to work for 7 seconds and stop for 7 seconds, the highest vehicle speed is limited, and the fault is automatically recovered after being eliminated.
Further, when the vacuum pressure sensor fails and the vacuum pressure sensor is abnormal in the over-voltage state, the vacuum pressure sensor fails prior to the vacuum pressure sensor being abnormal.
1. The utility model discloses a data such as collection atmospheric pressure, system vacuum pressure and brake switch make the electric vacuum pump control strategy that satisfies whole car service brake helping hand, satisfy electric automobile's driving control requirement better to form one set of more effectual driving trouble and report an emergency and ask for help or increased vigilance the tactics.
2. The utility model discloses a scheme and relay warning strategy that set up two relay circuits can satisfy the use mileage of vehicle 3 years 30 kilometers, have solved the low technological problem of the average life of relay in the trade.
3. The utility model discloses an increase atmospheric pressure sensor and vacuum system pressure sensor, combine the control strategy of electric vacuum pump simultaneously, can solve the regional driving of different height above sea level and use to realize electric automobile's more extensive popularization and application.
4. The utility model discloses a circuit signal detects, formulates more effectual system fault and reports an emergency and asks for help or increased vigilance the tactics, solves the not enough that current driving control system exists.
5. The utility model discloses with controller integration to vehicle control unit, replaced independent electric vacuum pump controller, its structure is more reasonable, and control effect is more optimized.
The above is only the concrete implementation of the present invention, but the design concept of the present invention is not limited to this, and all the design concepts are to be utilized to improve the present invention insubstantially, and all the behaviors belonging to the infringement of the protection scope of the present invention should be considered.
Claims (3)
1. The utility model provides an electric automobile service brake helping hand system which characterized in that: the system comprises a brake pedal switch, a vacuum pressure sensor, a vehicle control unit, an atmospheric pressure sensor, an electric vacuum pump, a relay set and a storage battery pack, wherein the vehicle control unit 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 gas storage tank, and the vacuum pressure sensor is used for monitoring the pressure of the vacuum gas storage tank in real time.
2. The service brake boosting system of an electric vehicle as claimed in claim 1, wherein: and an insurance resistor is connected between the storage battery and the relay group.
3. The service brake boosting system of an electric vehicle as claimed in claim 1, wherein: the storage battery is a 12V storage battery.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920445717.5U CN210027382U (en) | 2019-04-03 | 2019-04-03 | Service brake boosting system of electric automobile |
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| CN201920445717.5U CN210027382U (en) | 2019-04-03 | 2019-04-03 | Service brake boosting system of electric automobile |
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| CN210027382U true CN210027382U (en) | 2020-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2019
- 2019-04-03 CN CN201920445717.5U patent/CN210027382U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109878485B (en) * | 2019-04-03 | 2023-11-28 | 厦门金龙联合汽车工业有限公司 | Electric automobile service brake booster system, control strategy and fault diagnosis method thereof |
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