CN113147718A - Diagnosis control method and system for working state of vacuum pump - Google Patents
Diagnosis control method and system for working state of vacuum pump Download PDFInfo
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- CN113147718A CN113147718A CN202110637796.1A CN202110637796A CN113147718A CN 113147718 A CN113147718 A CN 113147718A CN 202110637796 A CN202110637796 A CN 202110637796A CN 113147718 A CN113147718 A CN 113147718A
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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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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a diagnostic control method for the working state of a vacuum pump, which comprises the following steps: and in the working process of the vacuum pump, monitoring the pressure value of the vacuum pipeline of the vacuum pump in real time, if the pressure of the vacuum pipeline of the vacuum pump does not reach the working pressure threshold value of the vacuum pump within the set time T1, diagnosing the vacuum pump as a fault, and sending a fault prompt of a vacuum system. The invention has the advantages that: the vacuum pump can be accurately diagnosed, and a fault reminding signal can be timely sent out when a fault occurs, so that a driver can be timely reminded; and the vacuum pump is enabled to continue to work through a strategy after the vacuum degree is failed, so that the driving risk caused by the failure of the vacuum pump is reduced as much as possible.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to a method and a system for diagnosing and controlling the working state of a vacuum pump of an electric automobile.
Background
Vacuum pumps (Mechanics), also known as booster pumps, are power-assisted devices for brake systems and steering systems, which are used to generate vacuum. The common cars are all hydraulic power-assisted brakes, and the common trucks or buses are all pneumatic power-assisted brakes. The electric automobile is driven by the motor, and a traditional engine is cancelled, so that a vacuum source is lost, and vacuum assistance cannot be provided for an automobile brake master cylinder. The vacuum booster pump of the electric automobile is used for making up for the deficiency. The vehicle-mounted power supply is adopted to provide power, the motor on the pump body is pushed to perform piston motion so as to generate vacuum, and a unique and reliable vacuum source is provided for the brake system of the electric automobile, so that the brake performance of the whole automobile is effectively improved. However, for the diagnosis of the working state of the vacuum pump of the electric vehicle, the identification of the fault and the control strategy after the diagnosis, no technical disclosure exists in the prior art, and the method cannot adapt to the development of the electric vehicle technology.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a diagnostic control method and a diagnostic control system for the working state of a vacuum pump, which are used for carrying out diagnostic control on the vacuum pump of an electric vehicle so as to meet the working control requirement of the vacuum pump of the electric vehicle and improve the stability and reliability of a vacuum boosting system of the electric vehicle.
In order to achieve the purpose, the invention adopts the technical scheme that: a diagnostic control method for the working state of a vacuum pump comprises the following steps:
and in the working process of the vacuum pump, monitoring the pressure value of the vacuum pipeline of the vacuum pump in real time, if the pressure of the vacuum pipeline of the vacuum pump does not reach the working pressure threshold value of the vacuum pump within the set time T1, diagnosing the vacuum pump as a fault, and sending a fault prompt of a vacuum system.
And after the fault of the vacuum pump is diagnosed, controlling the vacuum pump to stop working, wherein the stop working duration is a set threshold value T2, and the vacuum pump is restarted after the stop working duration reaches T2.
After the vacuum pump works again, controlling the work of the vacuum pump by using a transient vacuum pump stop threshold value; wherein the transient vacuum pump stop threshold is the value of the vacuum line pressure at the end of the set time T1.
After the transient vacuum pump stop threshold value is used for controlling the vacuum pump to work for a set number of times, when the vacuum pump is started again to work, the vacuum pump stop working pressure threshold value is used for stopping controlling the work of the vacuum pump, if the vacuum pipeline pressure can reach the vacuum pump stop working pressure threshold value within T1 time in the process of controlling the work of the vacuum pump, the vacuum pump stop working pressure threshold value is recovered to control the work of the vacuum pump, and an alarm signal is stopped to be sent; otherwise, the transient vacuum pump is continuously adopted to stop the threshold value to control the vacuum pump to work until the whole vehicle is electrified again.
After the transient vacuum pump stop threshold value is adopted to control the vacuum pump to work, when the vehicle is electrified again, the vacuum pump stop working pressure threshold value is recovered to stop control the work of the vacuum pump.
After the whole vehicle is powered on, the automatic detection of the vacuum pump is started, the vacuum pump is controlled to work in the automatic detection, and if the pressure of the vacuum pipeline of the vacuum pump reaches the threshold value of the pressure for stopping the vacuum pump within the set time T3, the fault of the vacuum pump is diagnosed, and a fault alarm prompt is sent.
In the working process of the vacuum pump, after the vacuum pipeline pressure sensor is detected to be out of order, the vacuum pump is diagnosed to be out of order, and the working failure prompt of the vacuum pump is sent out.
After the vacuum pump fault reminding signal is sent out, the VCU limits the power output of the whole vehicle, and limits the power output within a set range value.
The input end of the VCU is connected with the pressure sensor of the vacuum pipeline and used for judging whether the vacuum pump has a fault according to the working pressure of the vacuum pipeline pressure when the vacuum pump works, and the output end of the VCU is connected with the alarm reminding module and used for controlling the alarm reminding module to send a reminding signal after the vacuum pump has the fault.
The output end of the VCU of the vehicle controller is connected with a vehicle power system and used for limiting the brake force output under the fault signal, and the output end of the VCU of the vehicle controller is connected with a power output limiting indicator lamp and used for giving a power limiting reminding signal.
The input end of the vehicle control unit is connected with an atmospheric pressure sensor and used for acquiring atmospheric pressure, the atmospheric pressure signals are different, and the working stop pressure thresholds of the vacuum pump are also different, so that the atmospheric pressure needs to be acquired, and the value of the working pressure threshold of the vacuum pump is adjusted according to the atmospheric pressure.
The output end of the vehicle control unit controls whether the vacuum pump supplies power or not through the relay, so that whether the vacuum pump supplies power or not is controlled.
The invention has the advantages that: the vacuum pump can be accurately diagnosed, and a fault reminding signal can be timely sent out when a fault occurs, so that a driver can be timely reminded; after the vacuum degree is failed, the vacuum pump is enabled to continue to work through a strategy, so that the driving risk caused by the failure of the vacuum pump is reduced as much as possible; and the maximum value of the output power of the vehicle can be limited, and the running speed and the power under the fault condition can be reduced, so that the running safety and the reliability can be ensured under the condition that the vehicle can be used.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic diagram of a diagnostic control system of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
This application provides a new control strategy of vacuum pump to the diagnostic control strategy of the electric vacuum pump that can't provide electric automobile among the prior art to guaranteed the safe and reliable work of vacuum pump, and accomplish the purpose of in time reminding, guaranteed the driving safety and the reliability of car, concrete scheme is as follows:
a diagnostic control method for the working state of a vacuum pump comprises the following steps: and in the working process of the vacuum pump, monitoring the pressure value of the vacuum pipeline of the vacuum pump in real time, if the pressure of the vacuum pipeline of the vacuum pump does not reach the working pressure threshold value of the vacuum pump within the set time T1, diagnosing the vacuum pump as a fault, and sending a fault prompt of a vacuum system. The VCU is used for acquiring and controlling in real time, the VCU can acquire the driving intention of a driver to judge whether to control the work of the vacuum pump or not, if the work of the vacuum pump is required, the relay of the VCU controls the vacuum pump to be closed to supply power to the vacuum pump for work, and when the VCU works normally, the pressure value in a vacuum pipeline of the vacuum pump within a period of time can reach a certain numerical value, the data value is required for meeting the assistance provided by the vacuum pump, so that if the numerical value cannot be reached for a long time, the judgment that the vacuum air pumping capacity is weakened exists, a vacuum system fault exists, main components of the vacuum system in the application are the vacuum pump, a vacuum degree sensor and other components, and therefore alarm reminding is given out when the vacuum system fault or the vacuum pump fault occurs. Wherein the time T1, and the failed vacuum pump shutdown pressure threshold may be preset by calibration.
After the whole vehicle is electrified, the automatic detection of the vacuum pump is started immediately, the vacuum pump is controlled to work in the automatic detection, and if the pressure of the vacuum pipeline of the vacuum pump reaches the threshold value of the pressure for stopping the vacuum pump within the set time T3, the fault of the vacuum pump is diagnosed, and a fault alarm prompt is sent. A vacuum degree sensor/a vacuum pipeline pressure sensor arranged in a vacuum pipeline of the vacuum pump is used for detecting a pressure signal, and comparing the pressure signal with a preset vacuum pump working stop pressure threshold value to judge whether the vacuum pump can provide enough vacuum degree for vacuum assistance. The method is mainly used for detecting whether a fault exists after the vacuum pump is powered on, and the detection after the vacuum pump is started and the fault detection in the working process can be realized by combining the detection in the working process of the vacuum pump and the detection in the two processes. The vacuum booster pump of the electric automobile is called as a vacuum pump for short, the vacuum pump works when the vacuum booster pump is electrified, a relay is arranged on a power supply loop of a power supply of the whole automobile, the work of the vacuum pump can be controlled through the relay, in the process of electrifying the whole automobile, the VCU controls the relay to be closed, whether the vacuum degree required by vacuum boosting can be reached within the range of set time T2 is detected, and therefore whether the vacuum pump has a fault is judged, and if the fault exists, the fault is diagnosed and a fault prompt is sent.
In this application, start the automatic in-process at the vehicle or the vacuum pump works and crosses the car various, real-time detection vacuum pump pipeline pressure signal, in case detect the sensor and break down, then no sensor's pressure signal this moment, the vacuum pump provides the helping hand then does not have any data and can detect, also sends alarm signal this moment, this alarm signal is vacuum system's alarm signal or directly reports vacuum pump trouble. Thereby monitoring the additional sensor of vacuum pump to the realization detects the all aspects of vacuum pump. The detection of the sensor fault can be judged according to data transmitted by the sensor, and if the VCU cannot receive the vacuum pressure value signal, the sensor fault is judged. And fifthly, judging that the sensor fails.
Send alarm signal after judging the vacuum pump trouble, conventional practice is the work of stopping the vacuum pump, but direct stop work is very dangerous thing to the vehicle that is traveling, consequently, this application provides a control strategy can provide vacuum helping hand under the prerequisite of guaranteeing safety after sending to the trouble, controls the work of vacuum pump:
and after the fault of the vacuum pump is diagnosed, controlling the vacuum pump to stop working, wherein the stop working duration is a set threshold value T2, and the vacuum pump is restarted after the stop working duration reaches T2. The time T2 can be calibrated, and after the vacuum pump works again, the transient vacuum pump stop threshold value is used for controlling the work of the vacuum pump; wherein the transient vacuum pump stop threshold is the value of the vacuum line pressure at the end of the set time T1. After the transient vacuum pump stop threshold value is used for controlling the vacuum pump to work for a set number of times, when the vacuum pump is started again to work, the vacuum pump stop working pressure threshold value is used for stopping controlling the work of the vacuum pump, if the vacuum pipeline pressure can reach the vacuum pump stop working pressure threshold value within T1 time in the process of controlling the work of the vacuum pump, the vacuum pump stop working pressure threshold value is recovered to control the work of the vacuum pump, and an alarm signal is stopped to be sent; otherwise, the transient vacuum pump is continuously adopted to stop the threshold value to control the vacuum pump to work until the whole vehicle is electrified again. Therefore, the vacuum pump can be controlled to provide the assistance by the new transient threshold value so as to control whether the vacuum pump works or not, and although the assistance is not comfortable normally, the use of a user is not influenced, so that the use of the user is ensured, and the safety is ensured. The method can avoid accidental faults, the original threshold value is tried to judge after the vacuum pump is started to work for a plurality of times, if the preset threshold value can be reached, the accidental faults are indicated, the original threshold value is recovered to work, and the alarm is stopped; otherwise, the whole vehicle is powered off. After the transient vacuum pump stop threshold value is adopted to control the vacuum pump to work, when the vehicle is electrified again, the vacuum pump stop working pressure threshold value is recovered to stop control the work of the vacuum pump. After the power-on, the fault detection is carried out according to the power-on self-detection flow and the detection is also carried out in the working process of the vacuum pump, so that the recovery is carried out firstly, and if the fault still occurs, the working of the vacuum pump is controlled according to the transient threshold value generated by the fault. The work of the vacuum pump is calculated once after the work of one power supply is finished, and the work of the vacuum pump is calculated once if the relay is switched off after the relay is switched on.
After the vacuum pump fault reminding signal is sent out, the VCU limits the power output of the whole vehicle, limits the power output within a set range value, and limits the power and the power which can be output by the power system to 50% of the original maximum output power and the original power, so that the maximum power output is limited, the safety is ensured, and the danger caused by high-speed running is avoided under the fault condition.
As shown in fig. 1, a diagnostic control system for a working state of a vacuum pump is used for implementing the diagnostic control method for the working state of the vacuum pump, and includes a vehicle control unit VCU, a vacuum pipeline pressure sensor and an alarm reminding module, wherein an input end of the vehicle control unit VCU is connected to the vacuum pipeline pressure sensor and is used for judging whether the vacuum pump has a fault according to a working pressure of the vacuum pipeline pressure when the vacuum pump works, and an output end of the vehicle control unit is connected to the alarm reminding module and is used for controlling the alarm reminding module to send a reminding signal after the vacuum pump has the fault. The reminding module can be realized by adopting an instrument and gives reminding by adopting the modes of an acousto-optic indicator lamp and the like.
The output end of the VCU of the vehicle controller is connected with a vehicle power system and used for limiting the brake force output under the fault signal, and the output end of the VCU of the vehicle controller is connected with a power output limiting indicator lamp and used for giving a power limiting reminding signal.
The input end of the vehicle control unit is connected with an atmospheric pressure sensor and used for acquiring atmospheric pressure, the atmospheric pressure signals are different, and the working stop pressure thresholds of the vacuum pump are also different, so that the atmospheric pressure needs to be acquired, and the value of the working pressure threshold of the vacuum pump is adjusted according to the atmospheric pressure. Therefore, signals such as a stop pressure threshold value of the assisted work of the vacuum pump can be judged according to the atmospheric pressure, and the corresponding relation between the atmospheric pressure and the signals can be calibrated in advance.
The output end of the vehicle control unit controls whether the vacuum pump supplies power or not through the relay, so that whether the vacuum pump supplies power or not is controlled.
The VCU judges the current working state of the vacuum pump according to the values of the atmospheric pressure sensor and the vacuum pump pipeline sensor when the vacuum pump works so as to diagnose and control. The atmospheric pressure sensor is used for determining a pressure threshold value of the vacuum pipeline corresponding to the pressure threshold value of the vacuum pipeline for stopping working.
When a driver has the habit of continuously and lightly stepping on the brake pedal, the vacuum pump can continuously consume vacuum, the brake pedal becomes very hard under the condition of insufficient vacuum, and the VCU reports a brake fault to remind the driver when judging the reaching condition, so that the loss and the accident are reduced as much as possible. The function realization of the control system for diagnosing the working state of the vacuum pump by the VCU mainly comprises the following parts (VCU, CAN network, atmospheric pressure sensor, vacuum pump and vacuum pipeline pressure sensor:
vehicle control unit VCU function brief introduction:
1: acquiring a driving intention: the VCU needs to judge the driving intention through driving input signals such as an accelerator pedal, a brake pedal, gear states and the like.
2: acquiring the actual state of the vehicle: the VCU needs to acquire running information such as vehicle speed and attitude through a sensor or a controller to determine the current actual state of the vehicle.
3: power control: the VCU needs to match driving requirements and power assembly response capacity and formulate reasonable power output and energy recovery strategies
4: information feedback: the VCU needs to send critical information to the meters to inform the driver of the vehicle's status.
5: the judgment and decision of the faults of the whole vehicle, the fault recording of the vehicle and the like are realized;
6, the system has a safety protection function, carries out classification treatment on the whole vehicle according to fault types, can directly close power output in emergency, cuts off a high-voltage system and the like.
7: the communication with the controllers of BMS, OBC, DCDC, etc. is performed through the CAN bus, and in some cases, the communication with the vehicle body control unit, etc. may be required through the LIN bus.
Vacuum pump introduction: the vacuum pump is a power assisting device of a brake braking system and a steering system. The vacuum pump is used for generating vacuum. The common cars are all hydraulic power-assisted brakes, and the common trucks or buses are all pneumatic power-assisted brakes. The vacuum pump is used for generating negative pressure, so that the braking force is increased. The vacuum pump of the automobile generator is generally an oil pump, namely a vacuum pump core and a generator shaft rotate together, and negative pressure, namely vacuum, is generated in a vacuum pump by continuous oil absorption and oil pumping.
Introduction to barometric pressure sensor: for detecting the atmospheric pressure value.
Vacuum line pressure sensor: for detecting the pressure value of vacuum pipeline of vacuum pump
Introduction of CAN bus:
CAN is an abbreviation of (Controller Area Network), the chinese name "Controller Area Network". CAN is a field bus for communication between controllers. The CAN bus was first applied in the automotive industry and was first proposed by the german doctor group. Due to the fact that the functional requirements of automobiles are continuously increased, electronic devices are multiplied, and the wiring mode of communication signals among all controllers is complex, a single network bus is designed, and all controllers of the whole automobile can be hung on the network.
The vacuum pump is a power assisting device of a brake braking system and a steering system, and is an indispensable part of an automobile. The VCU judges whether the vacuum pump needs to be started at present through the values of the atmospheric pressure and the vacuum pipeline pressure of the vacuum pump, and can detect and make a corresponding strategy when the vacuum pump or the sensor is abnormal.
1. After the whole vehicle is electrified, the vehicle controller starts to detect the opening of the vacuum pump, and judges the current state of the vacuum pump according to the analyzed atmospheric pressure and the vacuum pipeline pressure of the vacuum pump.
2. Control strategy
1) When the conditions of system power-on, VCU detection that the vehicle is not in a forbidden state, VCU upper low voltage electricity or lower low voltage electricity within 10s (time can be calibrated) are met, the water pump is allowed to be started;
2) according to the analyzed atmospheric pressure and the vacuum pipeline pressure of the vacuum pump, whether the vacuum pump needs to be started at present is judged (a judgment rule can be defined by self: start of operation pressure (kpa)/absolute pressure);
3) in the working process of the vacuum pump, if the pressure of a vacuum pipeline of the vacuum pump tends to be stable (the continuous working is more than or equal to 60s, the time can be calibrated), but the pressure does not reach the working stopping pressure of the vacuum pump (namely the air suction capacity of the vacuum pump is weakened), the vacuum pump needs to be stopped, and the current pressure value is set as the new working stopping pressure of the vacuum pump. And after working for 3 times under the new stop working pressure, trying to stop working under the original stop working pressure, if the original stop working pressure can be reached, recovering the original stop working pressure, and if the original stop working pressure cannot be reached, continuing to use the new stop working pressure. After the whole vehicle is electrified again, the vehicle starts to work according to the original working pressure;
4) when the vacuum pump meets any one of the following conditions, the alarm is triggered, and the whole vehicle fault and the limited power fault of the instrument are lightened
1. The vacuum pump works continuously for more than or equal to 60s (time can be calibrated), the vacuum system gives an alarm, the continuous time is more than or equal to 120s (time can be calibrated), and the vacuum pump works again after stopping for 3s (time can be calibrated)
2. The whole vehicle is electrified (including starting power-on self-check), and after 30s (time can be calibrated), the pressure of the vacuum pipeline of the vacuum pump does not reach the closing threshold value of the vacuum pump
3. After the sensor fault is detected (no vacuum pressure value signal or environment pressure value signal is input), the vacuum pump gives an alarm
5) The vacuum pump alarms, and the VCU limits 50% power (calibratable) until the alarm is cleared.
VCU judges the current operating condition of vacuum pump through the value of atmospheric pressure sensor and vacuum pump pipeline sensor when the vacuum pump work, monitors the state of vacuum pump constantly, can discover the trouble of vacuum pump and remind the driver at any time, when guaranteeing relative security, has also improved the availability factor of vacuum pump.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. A diagnostic control method for the working state of a vacuum pump is characterized in that: the method comprises the following steps:
and in the working process of the vacuum pump, monitoring the pressure value of the vacuum pipeline of the vacuum pump in real time, if the pressure of the vacuum pipeline of the vacuum pump does not reach the working pressure threshold value of the vacuum pump within the set time T1, diagnosing the vacuum pump as a fault, and sending a fault prompt of a vacuum system.
2. A diagnostic control method of an operating state of a vacuum pump according to claim 1, characterized in that: and after the fault of the vacuum pump is diagnosed, controlling the vacuum pump to stop working, wherein the stop working duration is a set threshold value T2, and the vacuum pump is restarted after the stop working duration reaches T2.
3. A diagnostic control method of an operating state of a vacuum pump according to claim 2, characterized in that: after the vacuum pump works again, controlling the work of the vacuum pump by using a transient vacuum pump stop threshold value; wherein the transient vacuum pump stop threshold is the value of the vacuum line pressure at the end of the set time T1.
4. A diagnostic control method of an operating state of a vacuum pump according to claim 3, characterized in that: after the transient vacuum pump stop threshold value is used for controlling the vacuum pump to work for a set number of times, when the vacuum pump is started again to work, the vacuum pump stop working pressure threshold value is used for stopping controlling the work of the vacuum pump, if the vacuum pipeline pressure can reach the vacuum pump stop working pressure threshold value within T1 time in the process of controlling the work of the vacuum pump, the vacuum pump stop working pressure threshold value is recovered to control the work of the vacuum pump, and an alarm signal is stopped to be sent; otherwise, the transient vacuum pump is continuously adopted to stop the threshold value to control the vacuum pump to work until the whole vehicle is electrified again.
5. A diagnostic control method of an operating state of a vacuum pump according to claim 4, characterized in that: after the transient vacuum pump stop threshold value is adopted to control the vacuum pump to work, when the vehicle is electrified again, the vacuum pump stop working pressure threshold value is recovered to stop control the work of the vacuum pump.
6. A diagnostic control method of an operating state of a vacuum pump according to claim 1, characterized in that: after the whole vehicle is powered on, the automatic detection of the vacuum pump is started, the vacuum pump is controlled to work in the automatic detection, and if the pressure of the vacuum pipeline of the vacuum pump reaches the threshold value of the pressure for stopping the vacuum pump within the set time T3, the fault of the vacuum pump is diagnosed, and a fault alarm prompt is sent.
7. A diagnostic control method of an operating state of a vacuum pump according to claim 1, characterized in that: in the working process of the vacuum pump, after the vacuum pipeline pressure sensor is detected to be out of order, the vacuum pump is diagnosed to be out of order, and the working failure prompt of the vacuum pump is sent out.
8. A diagnostic control method of an operating condition of a vacuum pump according to any one of claims 1 to 7, characterized in that: after the vacuum pump fault reminding signal is sent out, the VCU limits the power output of the whole vehicle, and limits the power output within a set range value.
9. A diagnostic control system for the operating condition of a vacuum pump, characterized by: the vehicle control unit VCU comprises a vehicle control unit VCU, a vacuum pipeline pressure sensor and an alarm reminding module, wherein the input end of the vehicle control unit VCU is connected with the vacuum pipeline pressure sensor and used for judging whether the vacuum pump has a fault according to the working pressure of the vacuum pipeline pressure when the vacuum pump works, and the output end of the vehicle control unit is connected with the alarm reminding module and used for controlling the alarm reminding module to send a reminding signal after the vacuum pump has the fault.
10. A diagnostic control system for an operating condition of a vacuum pump according to claim 9, wherein: the output end of the VCU of the vehicle controller is connected with a vehicle power system and used for limiting the brake force output under the fault signal, and the output end of the VCU of the vehicle controller is connected with a power output limiting indicator lamp and used for giving a power limiting reminding signal.
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| CN115095515A (en) * | 2022-07-13 | 2022-09-23 | 奇瑞商用车（安徽）有限公司 | Vacuum pump monitoring system and method |
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| CN111439275A (en) * | 2020-04-07 | 2020-07-24 | 奇瑞商用车（安徽）有限公司 | Automobile vacuum pump fault processing method and system |
| CN111591276A (en) * | 2020-05-09 | 2020-08-28 | 宜宾凯翼汽车有限公司 | Fault diagnosis and control method for automobile vacuum pump |
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| 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 |
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| CN115095515A (en) * | 2022-07-13 | 2022-09-23 | 奇瑞商用车（安徽）有限公司 | Vacuum pump monitoring system and method |
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