CN111252051A - Control method for electric vacuum pump of new energy automobile - Google Patents
Control method for electric vacuum pump of new energy automobile Download PDFInfo
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- CN111252051A CN111252051A CN201911183204.2A CN201911183204A CN111252051A CN 111252051 A CN111252051 A CN 111252051A CN 201911183204 A CN201911183204 A CN 201911183204A CN 111252051 A CN111252051 A CN 111252051A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention relates to a control method of an electric vacuum pump of a new energy automobile, which comprises the steps of firstly detecting an automobile external air pressure value and an air pressure value in a vacuum tank respectively, then entering a plateau control strategy or a non-plateau control strategy according to the automobile external air pressure value, then carrying out an on-shift control strategy and an off-shift control strategy according to key gears, finally calculating vacuum air leakage, and judging whether a vacuum pipeline fault occurs. The invention has the advantages that: the method comprises the steps of detecting the external air pressure of the automobile, adopting different control strategies according to different air pressure environments, and controlling the vacuum pump according to the air pressure in the vacuum pump, so that the phenomenon that the vacuum pump works all the time, and energy waste and pump body damage are avoided; the system has the functions of fault judgment and fault emergency.
Description
Technical Field
The invention relates to the field of new energy automobiles, in particular to a control method of an electric vacuum pump of a new energy automobile.
Background
The electric vacuum pump control strategy is a control logic and strategy for an electric vacuum pump on an automobile. The electric vacuum pump is a part of an automobile vacuum boosting system, and the vacuum boosting system comprises: the vacuum pump comprises parts such as an electric vacuum pump, a vacuum tank, a vacuum booster, a vacuum pipeline and the like, wherein the electric vacuum pump is used for pumping vacuum; the vacuum tank is used for storing the vacuum pumped by the electric vacuum pump, collecting a vacuum degree signal and controlling the trend of the vacuum; the vacuum booster is responsible for providing the driver with assistance, which has made it possible for the driver to provide sufficient braking strength with a low pedal effort, while this process is vacuum consuming.
Therefore, whether the control strategy of the electric vacuum pump is reasonable or not depends on the braking strength of the whole vehicle, and has important influence on the safety of the whole vehicle. The electric vacuum pump consumes electric energy of the whole vehicle, and particularly for pure electric vehicles, the electric vacuum pump control strategy is reasonable or not, and the endurance mileage of the whole vehicle is influenced.
The traditional electric vacuum pump control strategy can only realize simple start and stop, and does not have a plateau control strategy, a fault judgment function and a fault emergency function. When atmospheric pressure is lower, two problems can appear, one, the vacuum pump stops the threshold and is less than atmospheric pressure, and the vacuum pump can not take out appointed pressure, can work all the time, causes extravagantly and the pump body damages. Secondly, because of the low atmospheric pressure, the pressure difference at the vacuum booster is reduced, the boosting effect is weakened, and the pedal feel is not good.
Disclosure of Invention
The invention mainly solves the problems and provides the control method of the electric vacuum pump of the new energy automobile, which can simultaneously acquire atmospheric pressure and system vacuum degree, perform differential control under the condition of different atmospheric pressures and prolong the service life of the pump body.
The technical scheme adopted by the invention for solving the technical problem is that the control method of the electric vacuum pump of the new energy automobile controls a vacuum boosting system through the vacuum pump, the vacuum boosting system comprises the electric vacuum pump, a vacuum tank, a vacuum pipeline and a vacuum booster for providing brake pedal boosting, a vacuum sensor is arranged in the vacuum tank, and an air pressure sensor is arranged on the automobile, and the control method comprises the following steps:
s1: respectively detecting the external air pressure value of the automobile and the air pressure value in the vacuum tank;
s2: comparing the external air pressure value of the automobile with a preset first air pressure value, and entering a plateau control strategy and a non-plateau control strategy according to the comparison result;
s3: judging whether the key gear in the automobile is in an on gear or not, and if so, entering an on gear control strategy; if not, entering an off gear control strategy;
s4: and after an on gear control strategy/an off gear control strategy is carried out, calculating the vacuum air leakage amount and judging whether a vacuum pipeline fault occurs.
Whether the automobile is in a plateau area or not is judged according to the external air pressure value of the automobile, and then a plateau control strategy and a non-plateau control strategy are selected, and an on gear control strategy and an off gear control strategy are respectively arranged under the plateau control strategy and the non-plateau control strategy, so that the different control of the plateau area and the non-plateau area is realized.
As a preferable scheme of the above scheme, the on-gear control strategy includes the following steps:
s311: judging whether the voltage and the current of the vacuum pump are in a normal interval, if so, entering the next step, and otherwise, starting a fault processing mechanism;
s312: judging whether the vacuum sensor fails, if not, entering the next step, and if so, starting a failure processing mechanism;
s313: judging whether multiple times of vacuum pump overtime fault alarm information exists, if not, entering the next step, and if so, starting a fault processing mechanism;
s314: and judging whether a vacuum pipeline fault alarm exists or not, if not, starting a normal processing mechanism, and if so, starting a fault processing mechanism.
As a preferable solution of the above solution, the off-gear control strategy includes the following steps:
s321: clearing all faults;
s322: closing the vacuum pump;
s323: and reporting overtime fault alarm information of the vacuum pump for multiple times.
As a preferable solution of the above, the normal processing mechanism includes the steps of:
s31-1: judging whether the vehicle speed is less than a preset vehicle speed threshold value, if so, setting a vacuum pump starting threshold value as a preset low-speed starting threshold value, and setting a vacuum pump stopping threshold value as a preset low-speed stopping threshold value; if not, setting the vacuum pump starting threshold value as a preset high-speed starting threshold value, and setting the vacuum pump closing threshold value as a preset high-speed closing threshold value;
s31-2: judging whether the current air pressure value in the vacuum tank is greater than a vacuum pump closing threshold value, if so, closing the vacuum pump, clearing the number of times of overtime faults of the vacuum pump and air leakage fault alarms of the vacuum pump, outputting fault alarms when the current air pressure value in the vacuum tank is less than a preset fault value, setting the maximum opening time of the vacuum pump as a first time, and entering a step S31-5; if not, the step S31-3 is carried out;
s31-3: judging whether the current air pressure value in the vacuum tank is smaller than a vacuum pump starting threshold value, if so, starting the vacuum pump, setting the maximum vacuum pump starting time length as a first time length, and entering the step S31-5; if not, the step S31-4 is carried out;
s31-4: judging whether the brake pedal is in a fault state that the brake pedal is stepped on and the vacuum pump is not started overtime, if so, setting the maximum starting time of the vacuum pump as a first time, and entering the step S31-5; if not, the step S31-5 is carried out;
s31-5, judging whether the vacuum pump starting time length is overtime, if yes, closing the vacuum pump, adding 1 to the overtime fault frequency of the vacuum pump starting, giving an overtime fault alarm to the vacuum pump, and entering the step S31-6; if not, ending the normal processing mechanism;
s31-6: judging whether the number of times of the vacuum pump starting overtime faults exceeds a preset value or not, if so, reporting multiple times of vacuum pump overtime fault alarm information; if not, the normal processing mechanism is ended.
As a preferable solution of the above solution, the failure handling mechanism includes the following steps:
s32-1: outputting a fault alarm signal;
s32-2: judging whether the brake has a fault, if so, closing the vacuum pump and ending the fault processing mechanism; if not, the step S32-3 is carried out;
s32-3: judging whether the brake pedal is in a fault state that the brake pedal is stepped down and the vacuum pump has no start overtime, if so, starting the vacuum pump, wherein the start duration of the vacuum pump is a first duration, and ending a fault processing mechanism; if not, the vacuum pump is closed, and the fault processing mechanism is ended.
As a preferable scheme of the above scheme, in step S4, when the vacuum air leakage is greater than the air leakage threshold, a failure of the vacuum line is reported.
As a preferable mode of the above scheme, when the vehicle is powered on again, all the fault alarms are cleared before the step S1 is executed.
As a preferable mode of the above, after the step S4 is executed, if the vehicle is still in the power-on state, the step S1 is executed until the vehicle is powered off.
As a preferable scheme of the above scheme, the fault alarm signal includes vacuum pump voltage abnormality, vacuum pump current abnormality, vacuum sensor fault, multiple times of vacuum pump timeout and vacuum pipeline fault.
As a preferable scheme of the above scheme, the high-speed closing threshold includes a high-speed closing threshold for a plateau control strategy and a non-plateau high-speed closing threshold for a non-plateau control strategy, and the low-speed opening threshold includes a low-speed closing threshold for a plateau control strategy and a non-plateau low-speed closing threshold for a non-plateau control strategy.
The invention has the advantages that: the method comprises the steps of detecting the external air pressure of the automobile, adopting different control strategies according to different air pressure environments, and controlling the vacuum pump according to the air pressure in the vacuum pump, so that the phenomenon that the vacuum pump works all the time, and energy waste and pump body damage are avoided; the system has the functions of fault judgment and fault emergency.
Drawings
Fig. 1 is a schematic flow chart of a method for controlling an electric vacuum pump of a new energy vehicle in an embodiment.
FIG. 2 is a flowchart illustrating an on-gear control strategy according to an embodiment.
FIG. 3 is a flowchart illustrating an off-gear control strategy according to an embodiment.
FIG. 4 is a flowchart illustrating a normal processing mechanism according to an embodiment.
Fig. 5 is a flowchart illustrating a fault handling mechanism according to an embodiment.
FIG. 6 is a schematic flow chart illustrating the process of determining whether a vacuum line failure occurs according to the embodiment.
Detailed Description
The technical solution of the present invention is further described below by way of examples with reference to the accompanying drawings.
Example (b):
the control method of the electric vacuum pump of the new energy automobile comprises the following steps of controlling a vacuum boosting system through the vacuum pump, wherein the vacuum boosting system comprises the electric vacuum pump, a vacuum tank, a vacuum pipeline and a vacuum booster for providing boosting force for a brake pedal, a vacuum sensor is arranged in the vacuum tank, an air pressure sensor is arranged on the automobile, and a position sensor for detecting the position of the brake pedal is further arranged, as shown in fig. 1, the control method comprises the following steps:
s1: respectively detecting the external air pressure value of the automobile and the air pressure value in the vacuum tank; if the automobile is powered on again before the step is executed, all fault alarms are clear before the step is executed;
s2: comparing the external air pressure value of the automobile with a preset first air pressure value, entering a plateau control strategy and a non-plateau control strategy according to a comparison result, wherein the preset first air pressure value is 90kpa, the non-plateau control strategy is adopted when the external air pressure value of the automobile is greater than 90kpa, and otherwise, the plateau control strategy is adopted;
s3: after the plateau control strategy and the non-plateau control strategy are selected, judging whether the key gear in the automobile is in an on gear or not, and if so, entering the on gear control strategy; if not, entering an off gear control strategy;
the on-gear control strategy, as shown in fig. 2, includes the following steps:
s311: judging whether the voltage of the vacuum pump is between 9V and 16V and whether the current is between 4A and 12A, if so, entering the next step, and otherwise, starting a fault processing mechanism;
s312: judging whether the vacuum sensor fails, if not, entering the next step, and if so, starting a failure processing mechanism;
s313: judging whether multiple times of vacuum pump overtime fault alarm information exists, if not, entering the next step, and if so, starting a fault processing mechanism;
s314: and judging whether a vacuum pipeline fault alarm exists or not, if not, starting a normal processing mechanism, and if so, starting a fault processing mechanism.
The off gear control strategy, as shown in FIG. 3, includes the following steps:
s321: clearing all faults;
s322: closing the vacuum pump;
s323: reporting overtime fault alarm information of the vacuum pump for multiple times;
the normal processing mechanism, as shown in fig. 4, includes the following steps:
s31-1: judging whether the vehicle speed is less than a preset vehicle speed threshold value, if so, setting a vacuum pump starting threshold value as a preset low-speed starting threshold value, and setting a vacuum pump stopping threshold value as a preset low-speed stopping threshold value; if not, setting the vacuum pump starting threshold value as a preset high-speed starting threshold value, and setting the vacuum pump closing threshold value as a preset high-speed closing threshold value; the high-speed closing threshold value comprises a high-speed closing threshold value used for a plateau control strategy and a non-plateau high-speed closing threshold value used for a non-plateau control strategy, and the low-speed opening threshold value comprises a low-speed closing threshold value used for the plateau control strategy and a non-plateau low-speed closing threshold value used for the non-plateau control strategy. In the embodiment, the preset vehicle speed threshold is 40km/h, under the plateau control strategy, the low-speed opening threshold is 45kpa, the plateau low-speed closing threshold is 70kpa, the high-speed opening threshold is 55kpa, and the plateau high-speed closing threshold is 70 kpa; under a non-plateau control strategy, the low-speed opening threshold is 45kpa, the plateau low-speed closing threshold is 80kpa, the high-speed opening threshold is 55kpa, and the plateau high-speed closing threshold is 80 kpa;
s31-2: judging whether the current air pressure value in the vacuum tank is greater than a vacuum pump closing threshold value, if so, closing the vacuum pump, clearing the number of times of overtime faults of the vacuum pump and air leakage fault alarms of the vacuum pump, outputting a low-pressure fault alarm when the current air pressure value in the vacuum tank is less than a preset fault value, setting the maximum opening time of the vacuum pump as a first time, and entering a step S31-5; if not, the step S31-3 is carried out; in this embodiment, the preset fault value is 30kpa, and the first duration is 15 s;
s31-3: judging whether the current air pressure value in the vacuum tank is smaller than a vacuum pump starting threshold value, if so, starting the vacuum pump, setting the maximum vacuum pump starting time length as a first time length, and entering the step S31-5; if not, the step S31-4 is carried out;
s31-4: judging whether the brake pedal is in a fault state that the brake pedal is stepped on and the vacuum pump is not started overtime, if so, setting the maximum starting time of the vacuum pump as a first time, and entering the step S31-5; if not, the step S31-5 is carried out;
s31-5, judging whether the vacuum pump starting time length is overtime, if so, closing the vacuum pump, adding 1 to the number of times of the overtime fault of the vacuum pump starting, giving an overtime fault alarm of the vacuum pump starting, and entering the step S31-6; if not, ending the normal processing mechanism;
s31-6: judging whether the number of times of the vacuum pump starting overtime faults exceeds a preset value or not, if so, reporting multiple times of vacuum pump overtime fault alarm information; if not, ending the normal processing mechanism; the preset value in this embodiment is 3 times;
the failure handling mechanism, as shown in fig. 5, includes the following steps:
s32-1: outputting a fault alarm signal; the fault alarm signals comprise vacuum pump voltage abnormity, vacuum pump current abnormity, vacuum sensor fault, vacuum pump multiple overtime and vacuum pipeline fault;
s32-2: judging whether the brake has a fault, if so, closing the vacuum pump and ending the fault processing mechanism; if not, the step S32-3 is carried out;
s32-3: judging whether the brake pedal is in a fault state that the brake pedal is stepped down and the vacuum pump has no start overtime, if so, starting the vacuum pump, wherein the start duration of the vacuum pump is a first duration, and ending a fault processing mechanism; if not, the vacuum pump is closed, and the fault processing mechanism is ended.
S4: after the on-gear control strategy or the off-gear control strategy is carried out, the vacuum air leakage amount is calculated, whether a vacuum pipeline fault occurs or not is judged, and the vacuum pipeline fault judgment is as shown in fig. 6 and comprises the following steps:
s41: calculating the vacuum air leakage;
s42: comparing the vacuum air leakage with an air leakage threshold value, if the vacuum air leakage is greater than the air leakage threshold value, a pipeline air leakage fault exists, and reporting the vacuum pipeline air leakage fault; otherwise, the vacuum pipeline fault judgment is finished.
After the vacuum pipeline fault determination is completed, if the vehicle is still in the power-on state, step S1 is executed until the vehicle is powered off.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a new energy automobile electric vacuum pump control method, through vacuum pump control vacuum helping hand system, vacuum helping hand system includes electric vacuum pump, vacuum tank, vacuum line and provides the vacuum booster of brake pedal helping hand, is equipped with vacuum sensor in the vacuum tank, is equipped with baroceptor, characterized by on the car: the method comprises the following steps:
s1: respectively detecting the external air pressure value of the automobile and the air pressure value in the vacuum tank;
s2: comparing the external air pressure value of the automobile with a preset first air pressure value, and entering a plateau control strategy and a non-plateau control strategy according to the comparison result;
s3: judging whether the key gear in the automobile is in an on gear or not, and if so, entering an on gear control strategy; if not, entering an off gear control strategy;
s4: and after an on gear control strategy/an off gear control strategy is carried out, calculating the vacuum air leakage amount and judging whether a vacuum pipeline fault occurs.
2. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 1, characterized in that: the on-gear control strategy comprises the following steps:
s311: judging whether the voltage and the current of the vacuum pump are in a normal interval, if so, entering the next step, and otherwise, starting a fault processing mechanism;
s312: judging whether the vacuum sensor fails, if not, entering the next step, and if so, starting a failure processing mechanism;
s313: judging whether multiple times of vacuum pump overtime fault alarm information exists, if not, entering the next step, and if so, starting a fault processing mechanism;
s314: and judging whether a vacuum pipeline fault alarm exists or not, if not, starting a normal processing mechanism, and if so, starting a fault processing mechanism.
3. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 1, characterized in that: the off gear control strategy comprises the following steps:
s321: clearing all faults;
s322: closing the vacuum pump;
s323: and reporting overtime fault alarm information of the vacuum pump for multiple times.
4. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 2, characterized in that: the normal processing mechanism comprises the following steps:
s31-1: judging whether the vehicle speed is less than a preset vehicle speed threshold value, if so, setting a vacuum pump starting threshold value as a preset low-speed starting threshold value, and setting a vacuum pump stopping threshold value as a preset low-speed stopping threshold value; if not, setting the vacuum pump starting threshold value as a preset high-speed starting threshold value, and setting the vacuum pump closing threshold value as a preset high-speed closing threshold value;
s31-2: judging whether the current air pressure value in the vacuum tank is greater than a vacuum pump closing threshold value, if so, closing the vacuum pump, clearing the number of times of overtime faults of the vacuum pump and air leakage fault alarms of the vacuum pump, outputting a low-pressure fault alarm when the current air pressure value in the vacuum tank is less than a preset fault value, setting the maximum opening time of the vacuum pump as a first time, and entering a step S31-5; if not, the step S31-3 is carried out;
s31-3: judging whether the current air pressure value in the vacuum tank is smaller than a vacuum pump starting threshold value, if so, starting the vacuum pump, setting the maximum vacuum pump starting time length as a first time length, and entering the step S31-5; if not, the step S31-4 is carried out;
s31-4: judging whether the brake pedal is in a fault state that the brake pedal is stepped on and the vacuum pump is not started overtime, if so, setting the maximum starting time of the vacuum pump as a first time, and entering the step S31-5; if not, the step S31-5 is carried out;
s31-5, judging whether the vacuum pump starting time length is overtime, if so, closing the vacuum pump, adding 1 to the number of times of the overtime fault of the vacuum pump starting, giving an overtime fault alarm of the vacuum pump starting, and entering the step S31-6; if not, ending the normal processing mechanism;
s31-6: judging whether the number of times of the vacuum pump starting overtime faults exceeds a preset value or not, if so, reporting multiple times of vacuum pump overtime fault alarm information; if not, the normal processing mechanism is ended.
5. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 2, characterized in that: the fault handling mechanism comprises the steps of:
s32-1: outputting a fault alarm signal;
s32-2: judging whether the brake has a fault, if so, closing the vacuum pump and ending the fault processing mechanism; if not, the step S32-3 is carried out;
s32-3: judging whether the brake pedal is in a fault state that the brake pedal is stepped down and the vacuum pump has no start overtime, if so, starting the vacuum pump, wherein the start duration of the vacuum pump is a first duration, and ending a fault processing mechanism; if not, the vacuum pump is closed, and the fault processing mechanism is ended.
6. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 1, characterized in that: in the step S4, when the vacuum air leakage is greater than the air leakage threshold, a failure of the vacuum line is reported.
7. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 1, characterized in that: when the vehicle is powered back on, all fault alarms are cleared before step S1 is executed.
8. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 1, characterized in that: after step S4, if the vehicle is still powered on, step S1 is executed until the vehicle is powered off.
9. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 5, characterized in that: the fault alarm signal comprises vacuum pump voltage abnormity, vacuum pump current abnormity, vacuum sensor fault, vacuum pump multiple overtime and vacuum pipeline fault.
10. The control method of the electric vacuum pump of the new energy automobile as claimed in claim 4, characterized in that: the high-speed closing threshold value comprises a high-speed closing threshold value used for a plateau control strategy and a non-plateau high-speed closing threshold value used for a non-plateau control strategy, and the low-speed opening threshold value comprises a low-speed closing threshold value used for the plateau control strategy and a non-plateau low-speed closing threshold value used for the non-plateau control strategy.
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| CN201911183204.2A CN111252051A (en) | 2019-11-27 | 2019-11-27 | Control method for electric vacuum pump of new energy automobile |
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| CN201911183204.2A CN111252051A (en) | 2019-11-27 | 2019-11-27 | Control method for electric vacuum pump of new energy automobile |
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| CN112026738A (en) * | 2020-09-04 | 2020-12-04 | 上海拿森汽车电子有限公司 | Control method and device of electric power-assisted brake system and vehicle |
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