CN110901622A - Vacuum pump control method and device - Google Patents
Vacuum pump control method and device Download PDFInfo
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- CN110901622A CN110901622A CN201811076584.5A CN201811076584A CN110901622A CN 110901622 A CN110901622 A CN 110901622A CN 201811076584 A CN201811076584 A CN 201811076584A CN 110901622 A CN110901622 A CN 110901622A
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- vacuum pump
- vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- General Engineering & Computer Science (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention relates to the field of automobiles, and discloses a vacuum pump control method and device. The vacuum pump control method comprises the steps of judging whether the continuous working time of the vacuum pump is not less than first preset time under the condition that a braking system does not brake; when the time that the vacuum pump continuously works under the condition that the braking system does not brake is not less than first preset time is judged, whether the vacuum degree of the vacuum tank is not more than first preset pressure or not is judged; and when the vacuum degree of the vacuum tank is judged to be not greater than the first preset pressure, controlling the vacuum pump to stop working. Because the working time of the vacuum pump is long and the vacuum degree of the vacuum tank is still not improved to a high level, the phenomenon of air leakage can be considered to exist, and the vacuum pump is controlled to stop running at the moment to prevent the damage caused by the overlong working time of the vacuum pump. The vacuum pump control device of the present invention is used for implementing the control method described above, and therefore, has the beneficial effects described above.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a vacuum pump control method and device.
Background
The vacuum controller of the existing pure electric vehicle vacuum pump control system integrates a vacuum degree sensor and a vacuum pump start-stop control function, and controls the suction and the disconnection of a pump anode relay according to set parameters by acquiring vacuum degree data in a vacuum tank so as to realize the control of the start and the stop of the vacuum pump. When the air leakage of the power-assisted system occurs, the vacuum pump is damaged due to the prolonged working time.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a vacuum pump control method applied to an electric vehicle to solve the problem of damage of the vacuum pump due to air leakage caused by an excessively long continuous operation time. The invention also provides a vacuum pump control device for realizing the control method.
The embodiment of the invention is realized by the following steps:
in a first aspect, the present invention provides a vacuum pump control method, which is applied to an electric vehicle, where the electric vehicle includes a brake system, a vacuum tank, and a vacuum pump for controlling a vacuum degree in the vacuum tank, and the vacuum pump control method includes:
judging whether the continuous working time of the vacuum pump under the condition that the braking system does not brake is not less than first preset time or not;
when the time that the vacuum pump continuously works under the condition that the braking system does not brake is not less than first preset time is judged, whether the vacuum degree of the vacuum tank is not more than first preset pressure or not is judged;
and when the vacuum degree of the vacuum tank is judged to be not greater than the first preset pressure, controlling the vacuum pump to stop working.
In one embodiment of the present invention, the vacuum pump control method further includes:
judging whether the circulation times of the vacuum pump exceed the preset times or not;
when the number of times of the circulation of the vacuum pump exceeds the preset number of times, controlling the vacuum pump to stop working;
wherein, the vacuum pump cycle is the process that the vacuum pump is opened once and closed once.
In one embodiment of the present invention, the electric vehicle further includes a vacuum degree sensor for detecting a vacuum degree of the vacuum tank, and the vacuum pump control method further includes:
judging whether the output voltage value of the vacuum degree sensor is out of tolerance or not and the out-of-tolerance time exceeds a second preset time;
when the output voltage value of the vacuum degree sensor is judged to be out of tolerance and the out-of-tolerance time exceeds a second preset time, controlling the vacuum pump to stop working;
the output voltage value of the vacuum degree sensor is out of tolerance and is smaller than a first preset voltage or larger than a second preset voltage, wherein the second preset voltage is larger than the first preset voltage.
In an embodiment of the present invention, the positive electrode and the negative electrode of the vacuum pump are electrically connected to the positive relay and the negative relay, respectively, the step of controlling the vacuum pump to stop working includes disconnecting the positive relay, and after the step of controlling the vacuum pump to stop working, the method for controlling the vacuum pump of the electric vehicle further includes:
judging whether the positive relay is disconnected;
and when the positive relay is not disconnected, controlling the negative relay to be disconnected.
In an embodiment of the present invention, the method for controlling the vacuum pump of the electric vehicle further includes:
judging whether the vacuum degree of the vacuum tank is smaller than a second preset pressure and the duration time is not smaller than a third preset time;
and when the vacuum degree of the vacuum tank is judged to be smaller than the second preset pressure and the duration time is not smaller than the third preset time, controlling the vehicle speed not to exceed the first preset speed.
In one embodiment of the present invention, after the step of controlling the vacuum pump to stop operating, a degradation process is performed on the vacuum pump, the degradation process including:
judging whether the braking system brakes and the vacuum pump stops working or not;
when the brake system is judged to brake and the vacuum pump stops working, controlling the vacuum pump to start working and judging whether the continuous working time of the vacuum pump is not less than fourth preset time or not;
and when the continuous working time of the vacuum pump is not less than the fourth preset time, controlling the vacuum pump to stop working.
In a second aspect, the present invention further provides a vacuum pump control device, which is applied to an electric vehicle, where the electric vehicle includes a brake system, a vacuum tank, and a vacuum pump for controlling a vacuum degree in the vacuum tank, and the vacuum pump control device is configured to:
judging whether the continuous working time of the vacuum pump under the condition that the braking system does not brake is not less than first preset time, judging whether the vacuum degree of the vacuum tank is not more than first preset pressure or not when judging that the continuous working time of the vacuum pump under the condition that the braking system does not brake is not less than the first preset time, and controlling the vacuum pump to stop working when judging that the vacuum degree of the vacuum tank is not more than the first preset pressure.
In one embodiment of the invention, the vacuum pump control means is further adapted to:
judging whether the circulating times of the vacuum pump exceed the preset times or not, and controlling the vacuum pump to stop working when the circulating times of the vacuum pump exceed the preset times;
wherein, the vacuum pump cycle is the process that the vacuum pump is opened once and closed once.
In one embodiment of the present invention, the electric vehicle further includes a vacuum degree sensor for detecting a vacuum degree of the vacuum tank, and the vacuum pump control device is further configured to:
judging whether the output voltage value of the vacuum degree sensor is out of tolerance or not and the out-of-tolerance time exceeds a second preset time, and controlling the vacuum pump to stop working when the output voltage value of the vacuum degree sensor is judged to be out of tolerance and the out-of-tolerance time exceeds the second preset time;
the output voltage value of the vacuum degree sensor is out of tolerance and is smaller than a first preset voltage or larger than a second preset voltage, wherein the second preset voltage is larger than the first preset voltage.
In one embodiment of the present invention, the positive electrode and the negative electrode of the vacuum pump are electrically connected to a positive relay and a negative relay, respectively, the step of controlling the vacuum pump to stop includes disconnecting the positive relay, and the vacuum pump control device is further configured to:
and judging whether the positive relay is disconnected or not, and controlling the negative relay to be disconnected when the positive relay is not disconnected.
In an embodiment of the invention, the vacuum pump control device is further configured to determine whether the vacuum degree of the vacuum tank is less than a second preset pressure and the duration time is not less than a third preset time, and when the vacuum degree of the vacuum tank is determined to be less than the second preset pressure and the duration time is not less than the third preset time, control the vehicle speed not to exceed the first preset speed.
The embodiment of the invention has the beneficial effects that:
the vacuum pump control method provided by the embodiment of the invention is applied to an electric automobile, the electric automobile comprises a braking system, a vacuum tank and a vacuum pump for controlling the vacuum degree in the vacuum tank, and the vacuum pump control method comprises the steps of judging whether the continuous working time of the vacuum pump under the condition that the braking system does not brake is not less than a first preset time or not; when the time that the vacuum pump continuously works under the condition that the braking system does not brake is not less than first preset time is judged, whether the vacuum degree of the vacuum tank is not more than first preset pressure or not is judged; and when the vacuum degree of the vacuum tank is judged to be not greater than the first preset pressure, controlling the vacuum pump to stop working. The vacuum degree of the vacuum tank is the difference value of subtracting the air pressure in the vacuum tank from the external atmospheric pressure, so that when the working time of the vacuum pump is long (not less than the first preset time) and the vacuum degree of the vacuum tank is still not improved to a high level (greater than the first preset pressure), the air leakage phenomenon can be considered to exist, and at the moment, the vacuum pump is controlled to stop running to prevent the damage caused by the overlong working time of the vacuum pump.
The vacuum pump control device of the embodiment of the invention is used for realizing the control method, and therefore, the vacuum pump control device also has the beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic circuit diagram of an electric vehicle according to an embodiment of the present invention;
FIG. 2 is a block diagram of a vacuum pump control apparatus according to an embodiment of the present invention;
FIG. 3 is a flow chart of a vacuum pump control method in an embodiment of the present invention.
Icon: 1-vacuum pump control means; 2-a power system; 3-a braking system; 4-vacuum degree sensor; 5-an information output device; 6-a vacuum pump; 7-a positive relay; 8-a negative relay; 11-a fault detection module; 12-power-on initialization module; 13-normal working module; 14-high altitude working module; 15-a failure storage module; 16-a degradation handling module; 17-speed limit processing module; 18-fault display module; 19-vacuum pump drive module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
FIG. 1 is a schematic circuit diagram of an electric vehicle according to an embodiment of the present invention; FIG. 2 is a block diagram of a vacuum pump control apparatus 1 according to an embodiment of the present invention; FIG. 3 is a flow chart of a vacuum pump control method in an embodiment of the present invention. Referring to fig. 1, fig. 2 and fig. 3, the present embodiment provides a vacuum pump control method, which is applied to a pure electric vehicle, where the electric vehicle includes a power system 2, a vacuum pump control device 1, a brake system 3, an information output device 5, a vacuum tank, and a vacuum pump 6 for controlling a vacuum degree in the vacuum tank, and under a normal operation condition of the vehicle, the vacuum pump control method includes:
step 1A: and judging whether the vacuum degree of the vacuum pump is not greater than the first preset pressure, if so, executing the step 1B, otherwise, continuing to execute the step 1A.
In step 1A, the vacuum degree of the vacuum pump 6 may be detected by the vacuum degree sensor 4. The first preset pressure may be set to 50kpa, or alternatively, depending on the actual situation.
Step 1B: and controlling the vacuum pump to start working.
In the embodiment, the vacuum pump 6 is started by the vacuum pump driving module 19 controlling the positive relay 7 to close.
Step 1C: and judging whether the vacuum degree of the vacuum tank is not less than a third preset pressure. If yes, executing the step 1D, otherwise, returning to execute the step 1B.
In this embodiment, the third preset pressure may be set to 72kpa, and the third preset pressure should be greater than the first preset pressure.
Step 1D: and controlling the vacuum pump to stop working.
In the present embodiment, the way of controlling the vacuum pump 6 to stop operating is to turn off the positive relay 7. Thereafter, 1A is continued to be executed, thereby looping.
The above steps are the start and stop control strategy of the vacuum pump 6 in the normal working mode, which is realized by the normal working module 13. In addition to the vacuum pump control method including the above steps in a normal operation condition of the vehicle, the vacuum pump control method applies a strategy in a high altitude operation mode in a high altitude operation condition of the vehicle, which includes:
step 2A: judging whether the vacuum degree is not greater than a first preset pressure, if so, executing the step 2B, otherwise, continuing to execute the step 2A;
and step 2B: and controlling the vacuum pump to start working.
The implementation methods of step 2A and step 2B are the same as those of step 1A and step 1B, and are not described herein again.
And step 2C: and judging whether the working time of the vacuum pump is not less than the fourth preset time and the vacuum degree is greater than the first preset pressure under the condition that the braking system does not brake, if so, executing the step 2D, and otherwise, continuing to execute the step 2B.
In this embodiment, whether the brake system 3 brakes is determined by detecting a brake pedal signal, and the continuous working time (if a brake pedal signal is detected during recording, timing is cleared, and timing is restarted when no brake pedal signal is detected) and the real-time vacuum degree of the vacuum pump 6 under the condition of no brake pedal signal determine whether the working time of the vacuum pump 6 is not less than a fourth preset time and the vacuum degree is greater than a first preset pressure. In the present embodiment, the fourth preset time may be set to 7 s.
Step 2D: and controlling the vacuum pump to stop working.
Step 2D is implemented in the same manner as step 1D. Then, 2A is executed continuously, thereby looping.
In the present embodiment, the steps of the high altitude mode of operation are implemented by the high altitude module 14.
Under the two modes (the normal working mode and the high-altitude working mode), the vacuum pump control method is carried out according to two different strategies so as to ensure that the equipment can run more stably and safely under different air pressure environments. In the two modes, the vacuum pump control method further comprises the step of simultaneously carrying out fault detection so as to detect whether faults exist in each step in the two modes in real time. The fault detection is realized by a fault monitoring module. If the fault is found, the strategy is executed according to the fault detection module 11. If not, the vacuum pump 6 is controlled to start and stop according to the strategy in the normal working mode or the high-altitude working mode.
Therefore, in order to detect a failure in real time, the vacuum pump control method further includes:
and step S11, judging whether the time for which the vacuum pump continuously works under the condition that the brake system does not brake is not less than a first preset time.
In this step, the time counting is cleared when the brake pedal signal is detected during the time recording, and the time counting is restarted when the brake pedal signal is not present. In the present embodiment, the first preset time may be set to 20 s. Step S11 may be implemented by the fault detection module 11.
And step S12, when the duration of the vacuum pump working continuously under the condition that the brake system is not braked is judged to be not less than the first preset time, judging whether the vacuum degree of the vacuum tank is not more than the first preset pressure or not.
When it is determined that the time during which the vacuum pump 6 continues to operate without braking the brake system 3 is less than the first preset time, the operation continues to step S11, and the operation time of the vacuum pump 6 is monitored.
And step S13, when the vacuum degree of the vacuum tank is judged not to be larger than the first preset pressure, controlling the vacuum pump to stop working.
The vacuum pump 6 is controlled to stop working by the fault detection module 11 sending an instruction to the vacuum pump driving module 19, and the vacuum pump driving module 19 controlling the positive relay 7 to be switched off so as to stop working of the vacuum pump 6.
In addition, when the vacuum degree of the vacuum tank is not greater than the first preset pressure, the fault detection module 11 may output a first fault signal to the fault storage module 15, the fault storage module 15 records the type of the fault according to the first fault signal, for example, the fault is recorded as a "large leakage fault", the fault display module 18 is notified to output a first notification signal, the information output device 5 is controlled to output prompt information, for example, a warning lamp is turned on (normally on), meanwhile, a text prompt "brake boosting fault" is given, and the buzzer alarms and sounds and stops after 3 periods. When it is determined that the vacuum degree of the vacuum tank is greater than the first preset pressure (e.g., 50kpa), step 2D of shifting to the high altitude operation mode starts to be performed downward. The information output device 5 may be a display screen, a speaker, a signal lamp, or the like.
In an alternative embodiment of the present invention, the vacuum pump control method further includes:
and step S21, judging whether the number of times of vacuum pump circulation exceeds the preset number.
The vacuum pump 6 is cycled once, which is a process of turning on the vacuum pump 6 once and turning off once, and in this embodiment, the preset number of times may be 4 times. Step S21 is implemented by the fault detection module 11.
And step S22, when the number of times of the vacuum pump circulation is judged to exceed the preset number, controlling the vacuum pump to stop working.
The manner of controlling the vacuum pump 6 to stop operating is similar to that of step S13, and will not be described herein. In addition, when the number of times that the vacuum pump 6 circulates is judged to exceed the preset number of times, the fault detection module 11 may output a second fault signal to the fault storage module 15, the fault storage module 15 records the type of the fault according to the second fault signal, for example, records the type as a "small leakage fault", notifies the fault display module 18 to output a first notification signal, controls the information output device 5 to output a prompt message, for example, turn on a warning lamp (normally on), and simultaneously prompts the "brake boosting fault" in a text manner, and the buzzer alarms and sounds to stop after 3 cycles.
In an alternative embodiment of the present invention, the vacuum pump control method further includes:
step S31, judging whether the output voltage value of the vacuum degree sensor exceeds the tolerance and the out-of-tolerance time exceeds a second preset time;
in this step, the output voltage value of the vacuum degree sensor 4 is out of tolerance, that is, the output voltage is smaller than a first preset voltage or larger than a second preset voltage, wherein the second preset voltage is larger than the first preset voltage. In this embodiment, the first preset voltage may be set to 0.4V, the second preset voltage may be set to 4.5V, and the second preset time may be set to 2 s. It can be understood that the specific preset time and the preset voltage can be adjusted according to actual conditions.
And step S32, when the output voltage value of the vacuum degree sensor is judged to be out of tolerance and the out-of-tolerance time exceeds a second preset time, controlling the vacuum pump to stop working.
In this step, the manner of controlling the vacuum pump 6 to stop operating is the same as that in step S13, and the details are not repeated here. In addition, when it is determined that the output voltage value of the vacuum sensor 4 is out of tolerance and the out-of-tolerance time exceeds the second preset time, the fault detection module 11 may output a third fault signal to the fault storage module 15, the fault storage module 15 records the type of the fault according to the third fault signal, for example, records the type as "vacuum sensor fault", notifies the fault display module 18 to output a first notification signal, controls the information output device 5 to output a notification message, for example, turn on a warning lamp (normally on), and simultaneously, gives a text prompt of "brake boosting fault", and the buzzer alarms that the sound is stopped after 3 cycles.
In an alternative embodiment of the present invention, after the step of controlling the vacuum pump 6 to stop operating, the method for controlling a vacuum pump of an electric vehicle further comprises:
in step S41, it is determined whether the positive relay is off.
This step can be achieved by detecting whether the voltage across the positive relay 7 is still at a high level, and if it is still at a high level, it is not turned off.
And step S42, when the positive relay is not disconnected, the negative relay is controlled to be disconnected.
The operation of controlling the negative relay 8 to be turned off is performed by the vacuum pump driving module 19. In addition, when it is determined that the positive relay 7 is not turned off, the fault detection module 11 may output a fourth fault signal to the fault storage module 15, and the fault storage module 15 records the type of the fault according to the fourth fault signal, for example, as "positive relay fault", and notifies the fault display module 18 to output the first notification signal, so as to control the information output device 5 to output the notification information, for example, to turn on a warning lamp (normally on), and at the same time, to prompt "brake boosting fault" by text, and the buzzer alarms and sounds and stops after 3 cycles. According to the control method, when the positive relay 7 is adhered and cannot be disconnected, the negative relay 8 is disconnected, so that the vacuum pump 6 stops working, and the damage caused by long-time working is avoided.
In an alternative embodiment of the present invention, after the step of controlling the vacuum pump to stop operating, the method for controlling a vacuum pump of an electric vehicle further includes:
and step S51, judging whether the vacuum degree of the vacuum tank is smaller than the second preset pressure and the duration time is not smaller than the third preset time.
This step is performed by the fault detection module 11, in this embodiment, the second preset pressure may be set to 35kpa, and the third preset time may be set to 5s, and it should be understood that the second preset pressure and the third preset time may be adjusted according to actual conditions.
And step S52, when the vacuum degree of the vacuum tank is judged to be smaller than the second preset pressure and the duration time is not smaller than the third preset time, controlling the vehicle speed not to exceed the first preset speed.
Controlling the vehicle speed to not exceed the first preset speed may be accomplished by controlling the power system 2 via the speed limit processing module 17. In addition, when it is determined that the vacuum degree of the vacuum tank is smaller than the second preset pressure and the duration time is not smaller than the third preset time, the fault detection module 11 may output a fifth fault signal to the fault storage module 15, the fault storage module 15 records the type of the fault according to the fifth fault signal, for example, records the type as a "brake boosting low fault", and notifies the fault display module 18 to output a first notification signal, so as to control the information output device 5 to output a notification message, for example, to turn on a warning lamp (normally on), and at the same time, to prompt the "brake boosting fault" by text, and the buzzer alarms the sound box to stop after 3 cycles.
Five brake boosting faults are introduced, including a large leakage fault, a small leakage fault, a vacuum degree sensor fault, a positive pole relay fault and a brake boosting low fault. And after the faults of large leakage, small leakage and vacuum degree sensor are judged, performing degradation treatment on the vacuum pump, wherein the degradation treatment comprises the following steps:
step 3A: and judging whether the brake system brakes and the vacuum pump stops working or not.
In particular, in the present embodiment, this step may be performed by the degradation processing module 16 (see fig. 2). And the degradation processing module 16 judges whether the brake pedal is stepped on and the vacuum pump 6 stops working currently, if so, the step 3B is executed, and if not, the step 3A is continuously executed.
And step 3B: and controlling the vacuum pump to start working.
Taking the electric vehicle of the embodiment as an example, the step sends a vacuum pump positive relay actuation instruction to start the vacuum pump 6 to operate (making a request for priority of the instruction to enable the pump to respond quickly).
And step 3C: and judging whether the continuous working time of the vacuum pump is not less than the fourth preset time.
If yes, executing the step 3D, otherwise, continuing to execute the step 3B.
And step 3D: and controlling the vacuum pump to stop working.
Taking the electric vehicle of the embodiment of the present invention as an example, the step is to control the positive relay 7 to be turned off by sending a vacuum pump positive relay turn-off command to the vacuum pump driving module (see fig. 2), so as to control the vacuum pump 6 to stop working.
When the positive relay is judged to be in fault, the vacuum pump start-stop control is continuously carried out according to the previous mode (such as a normal operation mode or a high-altitude operation mode).
When it is determined as the "brake boosting low failure", the speed limit process is performed to limit the vehicle speed as described in step S52.
The vacuum pump control method of this embodiment further includes power-on initialization, which may be implemented by the power-on initialization module 12, and specifically includes:
and 4A, detecting the vehicle power-ON state by the vehicle controller, judging whether the power-ON state is changed from OFF to ON, if so, executing a step 4B, otherwise, continuously executing the step 4A.
And 4B, sending a vacuum pump anode relay actuation instruction to the vacuum pump driving module to enable the vacuum pump to start working.
And step 4C: and judging whether the current vacuum degree is not less than a third preset pressure (optionally 72 kpa). If yes, executing the step 4D, otherwise, returning to execute the step 4B.
And step 4D: and sending a positive relay disconnection instruction to the vacuum pump driving module to stop the vacuum pump.
And 4E: and the fault detection module detects whether the steps have faults in real time. If yes, executing according to the strategy of the fault detection module. And if not, executing the vacuum pump start-stop control according to the strategy of the normal working mode.
The vacuum pump control method of the embodiment has the following advantages:
1) when the vehicle enters a high-altitude area to drive, the vehicle controller can identify and enter a high-altitude working mode through the control strategy, so that the failure of the vacuum pump 6 due to long-time working is avoided.
2) When the boosting system leaks air and the vacuum degree sensor 4 fails, the vehicle control unit can identify and enter a safety mode through the control strategy, and the vacuum pump 6 is prevented from failing due to prolonged working time.
3) When the relay fails, the vehicle control unit can identify and control the pump cathode relay 8 to be disconnected through the control strategy, so that the vacuum pump 6 is prevented from failing due to long-time work.
4) When the vacuum assistance is low due to air leakage or pump failure, the vehicle controller can identify and control the vehicle to enter a speed-limiting mode through the control strategy, so that the safety problem caused by insufficient brake assistance is avoided.
5) And an environmental pressure sensor and a brake pedal opening sensor are not required to be additionally arranged, so that the cost of a single vehicle is saved.
In addition, as shown in fig. 2, an embodiment of the present invention further provides a vacuum pump control apparatus 1, which includes a power-on initialization module 12, a normal operation module 13, a high altitude operation module 14, a fault detection module 11, a vacuum pump driving module 19, a fault storage module 15, a fault display module 18, a degradation processing module 16, and a speed limit processing module 17, so as to implement the vacuum pump control method. The operation principle and function of each module are explained above, and are not described in detail here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A vacuum pump control method is applied to an electric vehicle, the electric vehicle comprises a brake system, a vacuum tank and a vacuum pump for controlling the vacuum degree in the vacuum tank, and is characterized by comprising the following steps:
judging whether the continuous working time of the vacuum pump under the condition that the braking system does not brake is not less than first preset time or not;
when the time that the vacuum pump continuously works under the condition that the braking system does not brake is not less than first preset time, judging whether the vacuum degree of the vacuum tank is not greater than first preset pressure or not;
and when the vacuum degree of the vacuum tank is judged to be not greater than the first preset pressure, controlling the vacuum pump to stop working.
2. A vacuum pump control method according to claim 1, further comprising:
judging whether the circulation times of the vacuum pump exceed preset times or not;
when the number of times of the vacuum pump circulation exceeds the preset number of times, controlling the vacuum pump to stop working;
wherein, the vacuum pump circulates once to turn on the vacuum pump once, and turns off the process once.
3. The vacuum pump control method according to claim 1, wherein the electric vehicle further includes a vacuum degree sensor for detecting a vacuum degree of the vacuum tank, the vacuum pump control method further comprising:
judging whether the output voltage value of the vacuum degree sensor is out of tolerance or not and the out-of-tolerance time exceeds a second preset time;
when the output voltage value of the vacuum degree sensor is judged to be out of tolerance and the out-of-tolerance time exceeds the second preset time, controlling the vacuum pump to stop working;
the output voltage value of the vacuum degree sensor is out of tolerance and is smaller than a first preset voltage or larger than a second preset voltage, wherein the second preset voltage is larger than the first preset voltage.
4. A vacuum pump control method according to any one of claims 1 to 3, wherein the positive electrode and the negative electrode of the vacuum pump are electrically connected to a positive relay and a negative relay, respectively, the step of controlling the stop of the vacuum pump includes turning off the positive relay, and after the step of controlling the stop of the vacuum pump, the electric vehicle vacuum pump control method further includes:
judging whether the positive relay is disconnected or not;
and when the positive relay is not disconnected, controlling the negative relay to be disconnected.
5. The vacuum pump control method according to claim 1, characterized in that the electric vehicle vacuum pump control method further comprises:
judging whether the vacuum degree of the vacuum tank is smaller than a second preset pressure and the duration time is not smaller than a third preset time;
and when the vacuum degree of the vacuum tank is judged to be smaller than the second preset pressure and the duration time is not smaller than the third preset time, controlling the vehicle speed not to exceed the first preset speed.
6. A vacuum pump control method according to any one of claims 1 to 3, wherein after the step of controlling the vacuum pump to stop operating, a degradation process is performed on the vacuum pump, the degradation process comprising:
judging whether the brake system brakes and the vacuum pump stops working or not;
when the brake system is judged to brake and the vacuum pump stops working, controlling the vacuum pump to start working and judging whether the continuous working time of the vacuum pump is not less than fourth preset time or not;
and when the continuous working time of the vacuum pump is judged to be not less than the fourth preset time, controlling the vacuum pump to stop working.
7. A vacuum pump control device is applied to an electric automobile which comprises a brake system, a vacuum tank and a vacuum pump for controlling the vacuum degree in the vacuum tank, and is characterized in that the vacuum pump control device is used for:
judging whether the continuous working time of the vacuum pump under the condition that the brake system does not brake is not less than first preset time or not, judging whether the vacuum degree of the vacuum tank is not more than first preset pressure or not when judging that the continuous working time of the vacuum pump under the condition that the brake system does not brake is not less than the first preset time, and controlling the vacuum pump to stop working when judging that the vacuum degree of the vacuum tank is not more than the first preset pressure.
8. The vacuum pump control apparatus of claim 7, further configured to:
judging whether the circulating times of the vacuum pump exceed preset times or not, and controlling the vacuum pump to stop working when the circulating times of the vacuum pump exceed the preset times;
wherein, the vacuum pump circulates once to turn on the vacuum pump once, and turns off the process once.
9. The vacuum pump control apparatus according to claim 7, wherein the electric vehicle further includes a vacuum degree sensor for detecting a vacuum degree of the vacuum tank, the vacuum pump control apparatus further being configured to:
judging whether the output voltage value of the vacuum degree sensor is out of tolerance or not and the out-of-tolerance time exceeds a second preset time, and controlling the vacuum pump to stop working when the output voltage value of the vacuum degree sensor is judged to be out of tolerance and the out-of-tolerance time exceeds the second preset time;
the output voltage value of the vacuum degree sensor is out of tolerance and is smaller than a first preset voltage or larger than a second preset voltage, wherein the second preset voltage is larger than the first preset voltage.
10. A vacuum pump control apparatus according to any of claims 7-9, wherein the positive and negative electrodes of the vacuum pump are electrically connected to a positive relay and a negative relay, respectively, the step of controlling the vacuum pump to stop operation comprises opening the positive relay, the vacuum pump control apparatus further being configured to:
and judging whether the positive relay is disconnected or not, and controlling the negative relay to be disconnected when the positive relay is not disconnected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811076584.5A CN110901622A (en) | 2018-09-14 | 2018-09-14 | Vacuum pump control method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811076584.5A CN110901622A (en) | 2018-09-14 | 2018-09-14 | Vacuum pump control method and device |
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| CN110901622A true CN110901622A (en) | 2020-03-24 |
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| CN201811076584.5A Pending CN110901622A (en) | 2018-09-14 | 2018-09-14 | Vacuum pump control method and device |
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