CN110682901A - Control method of vacuum pump of electric vehicle and electronic equipment - Google Patents
Control method of vacuum pump of electric vehicle and electronic equipment Download PDFInfo
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- CN110682901A CN110682901A CN201910862323.4A CN201910862323A CN110682901A CN 110682901 A CN110682901 A CN 110682901A CN 201910862323 A CN201910862323 A CN 201910862323A CN 110682901 A CN110682901 A CN 110682901A
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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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Abstract
The invention discloses a control method of an electric automobile vacuum pump and electronic equipment, wherein the method comprises the following steps: detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time; and switching the current execution mode of the vacuum pump into the to-be-executed mode, and adjusting the opening and closing vacuum degree threshold value parameter of the vacuum pump according to the current execution mode. The invention monitors the working time of the vacuum pump in real time, does not need to use an atmospheric pressure sensor, and can adapt to working conditions in plain and plateau only by using one relative air pressure vacuum degree sensor. Meanwhile, the judgment reference is the working time of the vacuum pump in the specific vacuum degree interval, so that the invention does not need a stroke sensor, and meanwhile, the judgment time can be obviously saved by the vacuum degree interval judgment mode. Thereby reducing the working time of the vacuum pump and prolonging the service life.
Description
Technical Field
The invention relates to the related technical field of electric automobiles, in particular to a control method of an electric automobile vacuum pump and electronic equipment.
Background
The vacuum pump is generally required to be installed on the pure electric automobile, and because the difference between the atmospheric pressure on the plateau and the atmospheric pressure on the plain is large, if the electric automobile with the vacuum pump enters a plateau area, the vacuum degree working threshold value of the vacuum pump needs to be modified so as to adapt to the atmospheric pressure on the plateau. If the existing electric automobile enters a plateau, an atmospheric pressure sensor is needed to monitor the change of environmental pressure, an atmospheric pressure signal is transmitted to a controller, and the vacuum degree working threshold value of a vacuum pump is adjusted. However, the use of an atmospheric pressure sensor increases vehicle cost, and meanwhile, the conventional vacuum pump control system of the electric vehicle generally uses an independent Controller, and cannot read a Controller Area Network (CAN) bus signal.
Disclosure of Invention
Therefore, it is necessary to provide a control method of a vacuum pump of an electric vehicle and an electronic device, which are used for solving the technical problems that the cost is increased and the service life of the vacuum pump is shortened due to long judgment time caused by the fact that an atmospheric pressure sensor and a stroke sensor are required to control the vacuum pump in the electric vehicle in the prior art.
The invention provides a control method of an electric automobile vacuum pump, which comprises the following steps:
detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time;
and switching the current execution mode of the vacuum pump into the to-be-executed mode, and adjusting the threshold parameter of the opening and closing vacuum degree of the vacuum pump according to the current execution mode.
Further, the vacuum degree judgment range includes: a plateau mode vacuum degree judgment range and a plateau mode vacuum degree judgment range;
the method comprises the following steps of detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time, wherein the method specifically comprises the following steps:
if the current execution mode is a plain mode, detecting the running time of the vacuum pump in a preset plateau vacuum degree judgment range, and if the running time is greater than a preset plateau mode time threshold, determining that the mode to be executed is a plateau mode;
and if the current execution mode is the plateau mode, detecting the running time of the vacuum pump in the preset plain vacuum degree judgment range, and if the running time is less than a preset plain mode time threshold, determining that the to-be-executed mode is the plain mode.
Further, the plateau mode vacuum degree judgment range is P3-P4, the plain mode vacuum degree judgment range is P7-P8, and the adjusting of the opening and closing vacuum degree threshold parameter of the vacuum pump in the current execution mode specifically includes:
if the current execution mode is the plateau mode, controlling the vacuum pump to start working when the vacuum degree is less than P5, and stopping working when the vacuum degree is greater than P6;
if the current execution mode is a plain mode, controlling the vacuum pump to start working when the vacuum degree is less than P1, and stopping working when the vacuum degree is more than P2;
wherein P5 is more than P6 and less than or equal to P1 and less than or equal to P2, P3 and less than or equal to P1, P4 and less than or equal to P2, P5 is more than or equal to P6 and less than or equal to P3, P7 and less than or equal to P5, and P8 and less than or equal to P6.
Furthermore, the system comprises a plurality of stages of to-be-executed modes, wherein each stage of to-be-executed mode corresponds to one stage of the vacuum degree judgment range, and each stage of vacuum degree judgment range corresponds to one stage of judgment time threshold;
the determining a to-be-executed mode according to the running time specifically includes:
acquiring a to-be-executed mode used by a current execution mode, and determining a next-stage vacuum degree judgment range and a previous-stage vacuum degree judgment range;
if the running time of the vacuum pump in the last-stage vacuum degree judgment range is smaller than the last-stage judgment time threshold, determining that the to-be-executed mode is the last-stage to-be-executed mode;
and if the running time of the vacuum pump in the next-stage vacuum degree judgment range is detected to be greater than the next-stage judgment time threshold, determining that the to-be-executed mode is the next-stage to-be-executed mode.
Still further, still include:
if a vacuum pump fault signal is detected and the current speed of the electric automobile is detected to be less than or equal to a preset safe speed threshold value, the vacuum pump is forcibly stopped;
and if the brake lamp signal is detected, stopping leakage fault diagnosis and continuously keeping the execution mode judgment of the vacuum pump.
The invention provides an electric automobile vacuum pump control electronic equipment, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the one processor to cause the at least one processor to:
detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time;
and switching the current execution mode of the vacuum pump into the to-be-executed mode, and adjusting the threshold parameter of the opening and closing vacuum degree of the vacuum pump according to the current execution mode.
Further, the vacuum degree judgment range includes: a plateau mode vacuum degree judgment range and a plateau mode vacuum degree judgment range;
the method comprises the following steps of detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time, wherein the method specifically comprises the following steps:
if the current execution mode is a plain mode, detecting the running time of the vacuum pump in a preset plateau vacuum degree judgment range, and if the running time is greater than a preset plateau mode time threshold, determining that the mode to be executed is a plateau mode;
and if the current execution mode is the plateau mode, detecting the running time of the vacuum pump in the preset plain vacuum degree judgment range, and if the running time is less than a preset plain mode time threshold, determining that the to-be-executed mode is the plain mode.
Further, the plateau mode vacuum degree judgment range is P3-P4, the plain mode vacuum degree judgment range is P7-P8, and the adjusting of the opening and closing vacuum degree threshold parameter of the vacuum pump in the current execution mode specifically includes:
if the current execution mode is the plateau mode, controlling the vacuum pump to start working when the vacuum degree is less than P5, and stopping working when the vacuum degree is greater than P6;
if the current execution mode is a plain mode, controlling the vacuum pump to start working when the vacuum degree is less than P1, and stopping working when the vacuum degree is more than P2;
wherein P5 is more than P6 and less than or equal to P1 and less than or equal to P2, P3 and less than or equal to P1, P4 and less than or equal to P2, P5 is more than or equal to P6 and less than or equal to P3, P7 and less than or equal to P5, and P8 and less than or equal to P6.
Furthermore, each stage of to-be-executed mode corresponds to one stage of the vacuum degree judgment range, and each stage of the vacuum degree judgment range corresponds to one stage of judgment time threshold;
the determining a to-be-executed mode according to the running time specifically includes:
acquiring a to-be-executed mode used by a current execution mode, and determining a next-stage vacuum degree judgment range and a previous-stage vacuum degree judgment range;
if the running time of the vacuum pump in the last-stage vacuum degree judgment range is smaller than the last-stage judgment time threshold, determining that the to-be-executed mode is the last-stage to-be-executed mode;
and if the running time of the vacuum pump in the next-stage vacuum degree judgment range is detected to be greater than the next-stage judgment time threshold, determining that the to-be-executed mode is the next-stage to-be-executed mode.
Still further, the processor is further capable of:
if a vacuum pump fault signal is detected and the current speed of the electric automobile is detected to be less than or equal to a preset safe speed threshold value, the vacuum pump is forcibly stopped;
and if the brake lamp signal is detected, stopping leakage fault diagnosis and continuously keeping the execution mode judgment of the vacuum pump.
The invention monitors the working time of the vacuum pump in real time, does not need to use an atmospheric pressure sensor, and can adapt to working conditions in plain and plateau only by using one relative air pressure vacuum degree sensor. Meanwhile, the judgment reference is the working time of the vacuum pump in the specific vacuum degree interval, so that the invention does not need a stroke sensor, and meanwhile, the judgment time can be obviously saved by the vacuum degree interval judgment mode. Thereby reducing the working time of the vacuum pump and prolonging the service life.
Drawings
FIG. 1 is a flow chart of the operation of a method for controlling a vacuum pump of an electric vehicle according to the present invention;
FIG. 2 is a system schematic of the preferred embodiment of the present invention;
FIG. 3 is a flow chart of the operation of the preferred embodiment of the present invention;
FIG. 4 is a flowchart of the operation of another embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware structure of an electronic device for controlling a vacuum pump of an electric vehicle according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Fig. 1 is a flowchart illustrating a method for controlling a vacuum pump of an electric vehicle according to the present invention, including:
step S101, detecting the running time of a vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time;
step S102, switching a current execution mode of the vacuum pump to the to-be-executed mode, and adjusting the threshold parameter of the opening and closing vacuum degree of the vacuum pump according to the current execution mode.
In particular, it can be implemented by using the system shown in fig. 2, which comprises: the vehicle control unit comprises a vehicle control unit 1 (VCM), a vacuum pump relay 2, an independent electric vacuum pump 3, a one-way valve 4, a vacuum tank 5, a brake master cylinder with vacuum booster assembly 6, a relative pressure vacuum degree sensor 7, a brake lamp signal 8 and a wheel speed sensor 9. The VCM controller 1 executes step S101, obtains a vacuum degree from the relative pressure vacuum degree sensor 7, determines a to-be-executed mode by calculating a running time of the vacuum pump within a preset vacuum degree determination range, and adjusts an on/off vacuum degree threshold parameter of the vacuum pump 3 in step S102.
Meanwhile, the judgment reference is the working time of the vacuum pump in the specific vacuum degree interval, so the judgment time is quicker. The judging time of the prior art is generally 25s or 30s, while the judging time of the invention only needs 8 s.
The invention monitors the working time of the vacuum pump in real time, does not need to use an atmospheric pressure sensor, and can adapt to working conditions in plain and plateau only by using one relative air pressure vacuum degree sensor. Meanwhile, the judgment reference is the working time of the vacuum pump in the specific vacuum degree interval, so that the invention does not need a stroke sensor, and meanwhile, the judgment time can be obviously saved by the vacuum degree interval judgment mode. Thereby reducing the working time of the vacuum pump and prolonging the service life.
In one embodiment, the vacuum degree determination range includes: a plateau mode vacuum degree judgment range and a plateau mode vacuum degree judgment range;
the method comprises the following steps of detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time, wherein the method specifically comprises the following steps:
if the current execution mode is a plain mode, detecting the running time of the vacuum pump in a preset plateau vacuum degree judgment range, and if the running time is greater than a preset plateau mode time threshold, determining that the mode to be executed is a plateau mode;
and if the current execution mode is the plateau mode, detecting the running time of the vacuum pump in the preset plain vacuum degree judgment range, and if the running time is less than a preset plain mode time threshold, determining that the to-be-executed mode is the plain mode.
Specifically, when the altitude rises, because atmospheric pressure reduces, consequently the vacuum pump needs longer operating time in predetermineeing high altitude vacuum degree judgement range to can judge that electric automobile has got into the plateau of altitude. And when the altitude is reduced, the operating time of the vacuum pump in the preset plain vacuum degree judgment range is reduced due to the increase of the atmospheric pressure, so that the fact that the electric automobile enters the plain with the low altitude is judged.
According to the method, the mode is switched between the plateau mode and the plain mode according to the plateau mode vacuum degree judgment range and the plain mode vacuum degree judgment range, and an Electric Vehicle (EV) model can adapt to the plain and the plateau working conditions without an atmospheric pressure sensor and a brake pedal stroke sensor. Meanwhile, the plateau mode is judged within the range of the vacuum degree interval, so that the judgment time is shortened, and the service life of the vacuum pump is prolonged.
In one embodiment, the plateau mode vacuum degree determination range is P3 to P4, the plain mode vacuum degree determination range is P7 to P8, and the adjusting the opening and closing vacuum degree threshold parameter of the vacuum pump in the current execution mode specifically includes:
if the current execution mode is the plateau mode, controlling the vacuum pump to start working when the vacuum degree is less than P5, and stopping working when the vacuum degree is greater than P6;
if the current execution mode is a plain mode, controlling the vacuum pump to start working when the vacuum degree is less than P1, and stopping working when the vacuum degree is more than P2;
wherein P5 is more than P6 and less than or equal to P1 and less than or equal to P2, P3 and less than or equal to P1, P4 and less than or equal to P2, P5 is more than or equal to P6 and less than or equal to P3, P7 and less than or equal to P5, and P8 and less than or equal to P6.
Specifically, the specific values of P1-P8 can be determined by calibration tests.
In the embodiment, the current execution mode is divided into a plateau mode and a plain mode, and the working threshold range of the vacuum pump in the plateau mode is smaller than that of the vacuum pump in the plain mode so as to meet the atmospheric pressure change caused by elevation.
Fig. 3 is a flow chart of the operation of the preferred embodiment of the present invention, which includes:
step S301, starting the vehicle;
step S302, whether the system power-on initialization is OK or not is judged, if the initialization fails, an initialization alarm strategy is executed, if the initialization succeeds, leakage and fault detection is executed, and step S303 is executed;
step S303, executing a plain mode [ P1, P2], wherein the vacuum pump starts to work when the vacuum degree is less than P1 and stops working when the vacuum degree is more than P2;
step S304, detecting whether the running time of the vacuum pump is higher than T1 in a preset vacuum degree range P3-P4, if so, executing step S305, otherwise, executing step S303;
step S305, executing plateau mode [ P5, P6], wherein the vacuum pump starts to work when the vacuum degree is less than P5 and stops working when the vacuum degree is more than P6;
and S306, detecting whether the running time of the vacuum pump is higher than T2 in the preset vacuum degree range P7-P8, if so, executing the step S305, otherwise, executing the step S303.
In one embodiment, the method comprises a plurality of stages of to-be-executed modes, wherein each stage of to-be-executed mode corresponds to one stage of the vacuum degree judgment range, and each stage of vacuum degree judgment range corresponds to one stage of judgment time threshold;
the determining a to-be-executed mode according to the running time specifically includes:
acquiring a to-be-executed mode used by a current execution mode, and determining a next-stage vacuum degree judgment range and a previous-stage vacuum degree judgment range;
if the running time of the vacuum pump in the last-stage vacuum degree judgment range is smaller than the last-stage judgment time threshold, determining that the to-be-executed mode is the last-stage to-be-executed mode;
and if the running time of the vacuum pump in the next-stage vacuum degree judgment range is detected to be greater than the next-stage judgment time threshold, determining that the to-be-executed mode is the next-stage to-be-executed mode.
In the embodiment, the plateau mode is further subdivided, and the working threshold of the vacuum pump is gradually reduced to adapt to the gradual rise of the altitude. Through the interval of more meticulous division plateau operating mode, when going to higher height above sea level, effectual protection vacuum pump prolongs vacuum pump life.
Fig. 4 shows a work flow diagram of another embodiment of the present invention, which includes:
step S401, starting a vehicle;
step S402, whether the system power-on initialization is OK or not is judged, if the initialization fails, an initialization alarm strategy is executed, if the initialization succeeds, leakage and fault detection is executed, and step S403 is executed;
step S403, executing a plain mode [ P1, P2], wherein the vacuum pump starts to work when the vacuum degree is less than P1 and stops working when the vacuum degree is more than P2;
step S404, detecting whether the running time of the vacuum pump is higher than T1 in a preset vacuum degree range P3-P4, if so, executing step S405, otherwise, executing step S403;
step S405, executing a first plateau mode [ P5, P6], wherein the vacuum pump starts to work when the vacuum degree is less than P5 and stops working when the vacuum degree is more than P6;
step S406, detecting whether the running time of the vacuum pump is higher than T2 in a preset vacuum degree range P7-P8, if so, executing step S407, otherwise, executing step S403;
step S407, detecting whether the running time of the vacuum pump is higher than T3 in a preset vacuum degree range P9-P10, if so, executing step S408, otherwise, executing step S405;
step S408, executing a second plateau mode [ P11, P12], wherein the vacuum pump starts to work when the vacuum degree is less than P11 and stops working when the vacuum degree is more than P12;
and step S409, detecting whether the running time of the vacuum pump is higher than T4 in the preset vacuum degree range P13-P14, if so, executing step S408, otherwise, executing step S405.
Specifically, the to-be-executed mode of the present embodiment includes a plain mode, a first plateau mode, and a second plateau mode. Step S403 is a plain mode, and in the plain mode, step S404 is executed to determine whether to execute the upgrade from step S405 to the first plateau mode. Step S405 is a first plateau mode, and in the first plateau mode, step S406 is executed to determine whether step S403 is to be executed to downgrade to a plain mode, and step S406 is executed to determine whether step S408 is to be executed to upgrade to a second plateau mode. Step S408 is a second plateau pattern, and in the second plateau pattern, step S409 is executed to determine whether to downgrade to the first plateau pattern.
In this example, the next-stage execution mode of the plain mode is the first plateau mode, the next-stage execution mode of the first plateau mode is the second plateau mode, the previous-stage execution mode of the second plateau mode is the first plateau mode, and the previous-stage execution mode of the first plateau mode is the plain mode. Taking the first highland mode as an example, the upper vacuum degree determination range is P7-P8 (step S406), and when the operation time of the vacuum pump is less than or equal to T2, the operation returns to the upper execution mode (plain mode) and step S403 is executed. The next stage vacuum degree determination range is P9-P10, step S407, when the operation time of the vacuum pump is about T3, the next stage execution mode, i.e. the second plateau mode, is executed, and step S408 is executed. For the plain mode, since the former stage execution mode is not available, only the next stage vacuum degree judgment range, namely, P3-P4, needs to be judged. Similarly, the second plateau mode has no next-stage execution mode, and therefore, only the upper-stage vacuum level determination range, i.e., P13-P14, needs to be determined.
In one embodiment, the method further comprises the following steps:
if a vacuum pump fault signal is detected and the current speed of the electric automobile is detected to be less than or equal to a preset safe speed threshold value, the vacuum pump is forcibly stopped;
and if the brake lamp signal is detected, stopping leakage fault diagnosis and continuously keeping the execution mode judgment of the vacuum pump.
When the vacuum system breaks down, the instrument can break down alarm lamp and prompt tone, and control system can send "vacuum pump continuous operation 10s simultaneously, stops 2s, and the continuous circulation" instruction, if there is not the speed of a motor vehicle signal, the vacuum pump can circulate all the time and go on until the vehicle stalls or the vacuum pump damages. According to the embodiment, the vehicle speed signal is increased, and when the vehicle speed is detected to be less than the preset safe speed threshold value V0, the vacuum pump is forcibly stopped and does not circulate any more, so that the damage caused by continuous circulating work of the vacuum pump in a failure mode can be avoided. When a brake light signal is detected, the running time of the vacuum pump in the preset vacuum degree judgment range is continuously detected, so that under a special working condition, such as a traffic light, a driver repeatedly and lightly shakes the pedal to cause vacuum consumption, the working time of the vacuum pump is prolonged, degradation is realized, namely, under a plain mode, a plateau mode can be executed, the working time of the vacuum pump can be shortened, and the service life of the vacuum pump is prolonged.
Meanwhile, in the present embodiment, the detection of the leakage failure is stopped when the brake light signal is detected. The traffic light repeats the condition of slight braking, and degradation is carried out as long as the vacuum pump works for too long time within a specific vacuum degree range no matter the brake light signal is triggered and not triggered (because a part of idle stroke exists, the brake light signal is not necessary when the brake is stepped on). Therefore, the brake light signal in this embodiment is only one condition for leak failure determination. Leakage fault judges among the prior art whether need judge to have the brake light signal, and this embodiment is different for prior art in that, plateau plain mode judges not need the brake light signal, like this under the special operating mode, also can carry out the plateau mode during the plain, protection vacuum pump life-span.
This embodiment uses the brake light switch to detect and replaces prior art's brake pedal travel sensor to detect, can effectively reduce whole car cost. Meanwhile, a vehicle speed signal is added as a detection condition, the vacuum pump in a fault state is forcibly stopped below a safe speed threshold value, the situation that the electric vacuum pump continuously works when a fault occurs in the vacuum power assisting system is effectively avoided, and the probability of replacing the vacuum pump during maintenance is greatly reduced.
Fig. 5 is a schematic diagram of a hardware structure of an electronic device for controlling a vacuum pump of an electric vehicle according to the present invention, which includes:
at least one processor 501; and the number of the first and second groups,
a memory 502 communicatively coupled to the at least one processor 501; wherein the content of the first and second substances,
the memory 502 stores instructions executable by the one processor to cause the at least one processor to:
detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time;
and switching the current execution mode of the vacuum pump into the to-be-executed mode, and adjusting the threshold parameter of the opening and closing vacuum degree of the vacuum pump according to the current execution mode.
The Electronic device is preferably an Electronic Control Unit (ECU), such as the VCM controller 1 in fig. 2.
In fig. 5, one processor 501 is taken as an example.
The electronic device may further include: an input device 503 and a display device 504.
The processor 501, the memory 502, the input device 503, and the display device 504 may be connected by a bus or other means, and are illustrated as being connected by a bus.
The memory 502, which is a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the method for controlling the vacuum pump of an electric vehicle in the embodiment of the present application, for example, the method flow shown in fig. 1. The processor 501 executes various functional applications and data processing by running nonvolatile software programs, instructions and modules stored in the memory 502, so as to implement the vacuum pump control method of the electric vehicle in the above embodiment.
The memory 502 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the electric vehicle vacuum pump control method, and the like. Further, the memory 502 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory 502 may optionally include memory located remotely from the processor 501, and these remote memories may be connected via a network to a device that performs the electric vehicle vacuum pump control method. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 503 may receive input of user clicks and generate signal inputs related to user settings and function control of the vacuum pump control method of the electric vehicle. The display 504 may include a display device such as a display screen.
When the one or more modules are stored in the memory 502, the method for controlling the vacuum pump of the electric vehicle in any of the above-described method embodiments is performed when the one or more modules are executed by the one or more processors 501.
The invention monitors the working time of the vacuum pump in real time, does not need to use an atmospheric pressure sensor, and can adapt to working conditions in plain and plateau only by using one relative air pressure vacuum degree sensor. Meanwhile, the judgment reference is the working time of the vacuum pump in the specific vacuum degree interval, so that the invention does not need a stroke sensor, and meanwhile, the judgment time can be obviously saved by the vacuum degree interval judgment mode. Thereby reducing the working time of the vacuum pump and prolonging the service life.
In one embodiment, the vacuum degree determination range includes: a plateau mode vacuum degree judgment range and a plateau mode vacuum degree judgment range;
the method comprises the following steps of detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time, wherein the method specifically comprises the following steps:
if the current execution mode is a plain mode, detecting the running time of the vacuum pump in a preset plateau vacuum degree judgment range, and if the running time is greater than a preset plateau mode time threshold, determining that the mode to be executed is a plateau mode;
and if the current execution mode is the plateau mode, detecting the running time of the vacuum pump in the preset plain vacuum degree judgment range, and if the running time is less than a preset plain mode time threshold, determining that the to-be-executed mode is the plain mode.
According to the method, the mode is switched between the plateau mode and the plain mode according to the plateau mode vacuum degree judgment range and the plain mode vacuum degree judgment range, and an Electric Vehicle (EV) model can adapt to the plain and the plateau working conditions without an atmospheric pressure sensor and a brake pedal stroke sensor. Meanwhile, the plateau mode is judged within the range of the vacuum degree interval, so that the judgment time is shortened, and the service life of the vacuum pump is prolonged.
In one embodiment, the plateau mode vacuum degree determination range is P3 to P4, the plain mode vacuum degree determination range is P7 to P8, and the adjusting the opening and closing vacuum degree threshold parameter of the vacuum pump in the current execution mode specifically includes:
if the current execution mode is the plateau mode, controlling the vacuum pump to start working when the vacuum degree is less than P5, and stopping working when the vacuum degree is greater than P6;
if the current execution mode is a plain mode, controlling the vacuum pump to start working when the vacuum degree is less than P1, and stopping working when the vacuum degree is more than P2;
wherein P5 is more than P6 and less than or equal to P1 and less than or equal to P2, P3 and less than or equal to P1, P4 and less than or equal to P2, P5 is more than or equal to P6 and less than or equal to P3, P7 and less than or equal to P5, and P8 and less than or equal to P6.
In the embodiment, the current execution mode is divided into a plateau mode and a plain mode, and the working threshold range of the vacuum pump in the plateau mode is smaller than that of the vacuum pump in the plain mode so as to meet the atmospheric pressure change caused by elevation.
In one embodiment, the method comprises a plurality of stages of to-be-executed modes, wherein each stage of to-be-executed mode corresponds to one stage of the vacuum degree judgment range, and each stage of vacuum degree judgment range corresponds to one stage of judgment time threshold;
the determining a to-be-executed mode according to the running time specifically includes:
acquiring a to-be-executed mode used by a current execution mode, and determining a next-stage vacuum degree judgment range and a previous-stage vacuum degree judgment range;
if the running time of the vacuum pump in the last-stage vacuum degree judgment range is smaller than the last-stage judgment time threshold, determining that the to-be-executed mode is the last-stage to-be-executed mode;
and if the running time of the vacuum pump in the next-stage vacuum degree judgment range is detected to be greater than the next-stage judgment time threshold, determining that the to-be-executed mode is the next-stage to-be-executed mode.
In the embodiment, the plateau mode is further subdivided, and the working threshold of the vacuum pump is gradually reduced to adapt to the gradual rise of the altitude. Through the interval of more meticulous division plateau operating mode, when going to higher height above sea level, effectual protection vacuum pump prolongs vacuum pump life.
In one embodiment, the processor is further capable of:
if a vacuum pump fault signal is detected and the current speed of the electric automobile is detected to be less than or equal to a preset speed threshold value, the vacuum pump is forcibly stopped;
and if the brake lamp signal is detected, stopping leakage fault diagnosis and continuously keeping the execution mode judgment of the vacuum pump.
This embodiment uses the brake light switch to detect and replaces prior art's brake pedal travel sensor to detect, can effectively reduce whole car cost. Meanwhile, a vehicle speed signal is added as a detection condition, the vacuum pump in a fault state is forcibly stopped below a safe speed threshold value, the situation that the electric vacuum pump continuously works when a fault occurs in the vacuum power assisting system is effectively avoided, and the probability of replacing the vacuum pump during maintenance is greatly reduced.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A control method for a vacuum pump of an electric automobile is characterized by comprising the following steps:
detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time;
and switching the current execution mode of the vacuum pump into the to-be-executed mode, and adjusting the threshold parameter of the opening and closing vacuum degree of the vacuum pump according to the current execution mode.
2. The method for controlling the vacuum pump of the electric vehicle according to claim 1, wherein the vacuum degree determination range includes: a plateau mode vacuum degree judgment range and a plateau mode vacuum degree judgment range;
the method comprises the following steps of detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time, wherein the method specifically comprises the following steps:
if the current execution mode is a plain mode, detecting the running time of the vacuum pump in a preset plateau vacuum degree judgment range, and if the running time is greater than a preset plateau mode time threshold, determining that the mode to be executed is a plateau mode;
and if the current execution mode is the plateau mode, detecting the running time of the vacuum pump in the preset plain vacuum degree judgment range, and if the running time is less than a preset plain mode time threshold, determining that the to-be-executed mode is the plain mode.
3. The method for controlling the vacuum pump of the electric vehicle as claimed in claim 2, wherein the plateau mode vacuum degree judgment range is P3-P4, the plateau mode vacuum degree judgment range is P7-P8, and the adjusting of the threshold value parameter of the opening and closing vacuum degree of the vacuum pump in the current execution mode specifically comprises:
if the current execution mode is the plateau mode, controlling the vacuum pump to start working when the vacuum degree is less than P5, and stopping working when the vacuum degree is greater than P6;
if the current execution mode is a plain mode, controlling the vacuum pump to start working when the vacuum degree is less than P1, and stopping working when the vacuum degree is more than P2;
wherein P5 is more than P6 and less than or equal to P1 and less than or equal to P2, P3 and less than or equal to P1, P4 and less than or equal to P2, P5 is more than or equal to P6 and less than or equal to P3, P7 and less than or equal to P5, and P8 and less than or equal to P6.
4. The electric vehicle vacuum pump control method according to claim 1, comprising a plurality of stages of to-be-executed modes, wherein each stage of to-be-executed mode corresponds to one stage of the vacuum degree judgment range, and each stage of the vacuum degree judgment range corresponds to one stage of judgment time threshold;
the determining a to-be-executed mode according to the running time specifically includes:
acquiring a to-be-executed mode used by a current execution mode, and determining a next-stage vacuum degree judgment range and a previous-stage vacuum degree judgment range;
if the running time of the vacuum pump in the last-stage vacuum degree judgment range is smaller than the last-stage judgment time threshold, determining that the to-be-executed mode is the last-stage to-be-executed mode;
and if the running time of the vacuum pump in the next-stage vacuum degree judgment range is detected to be greater than the next-stage judgment time threshold, determining that the to-be-executed mode is the next-stage to-be-executed mode.
5. The electric vehicle vacuum pump control method according to any one of claims 1 to 4, further comprising:
if a vacuum pump fault signal is detected and the current speed of the electric automobile is detected to be less than or equal to a preset safe speed threshold value, the vacuum pump is forcibly stopped;
and if the brake lamp signal is detected, stopping leakage fault diagnosis and continuously keeping the execution mode judgment of the vacuum pump.
6. An electric vehicle vacuum pump control electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the one processor to cause the at least one processor to:
detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time;
and switching the current execution mode of the vacuum pump into the to-be-executed mode, and adjusting the threshold parameter of the opening and closing vacuum degree of the vacuum pump according to the current execution mode.
7. The electronic device according to claim 6, wherein the vacuum degree determination range includes: a plateau mode vacuum degree judgment range and a plateau mode vacuum degree judgment range;
the method comprises the following steps of detecting the running time of the vacuum pump within a preset vacuum degree judgment range, and determining a mode to be executed according to the running time, wherein the method specifically comprises the following steps:
if the current execution mode is a plain mode, detecting the running time of the vacuum pump in a preset plateau vacuum degree judgment range, and if the running time is greater than a preset plateau mode time threshold, determining that the mode to be executed is a plateau mode;
and if the current execution mode is the plateau mode, detecting the running time of the vacuum pump in the preset plain vacuum degree judgment range, and if the running time is less than a preset plain mode time threshold, determining that the to-be-executed mode is the plain mode.
8. The electronic device of claim 7, wherein the plateau mode vacuum level determination range is P3-P4, the plateau mode vacuum level determination range is P7-P8, and the adjusting the threshold parameter of the vacuum pump vacuum level in the current execution mode specifically includes:
if the current execution mode is the plateau mode, controlling the vacuum pump to start working when the vacuum degree is less than P5, and stopping working when the vacuum degree is greater than P6;
if the current execution mode is a plain mode, controlling the vacuum pump to start working when the vacuum degree is less than P1, and stopping working when the vacuum degree is more than P2;
wherein P5 is more than P6 and less than or equal to P1 and less than or equal to P2, P3 and less than or equal to P1, P4 and less than or equal to P2, P5 is more than or equal to P6 and less than or equal to P3, P7 and less than or equal to P5, and P8 and less than or equal to P6.
9. The electronic device according to claim 6, comprising multiple stages of to-be-executed modes, wherein each stage of to-be-executed mode corresponds to one stage of the vacuum degree judgment range, and each stage of vacuum degree judgment range corresponds to one stage of judgment time threshold;
the determining a to-be-executed mode according to the running time specifically includes:
acquiring a to-be-executed mode used by a current execution mode, and determining a next-stage vacuum degree judgment range and a previous-stage vacuum degree judgment range;
if the running time of the vacuum pump in the last-stage vacuum degree judgment range is smaller than the last-stage judgment time threshold, determining that the to-be-executed mode is the last-stage to-be-executed mode;
and if the running time of the vacuum pump in the next-stage vacuum degree judgment range is detected to be greater than the next-stage judgment time threshold, determining that the to-be-executed mode is the next-stage to-be-executed mode.
10. The electronic device of any of claims 6-9, wherein the processor is further configured to: if a vacuum pump fault signal is detected and the current speed of the electric automobile is detected to be less than or equal to a preset safe speed threshold value, the vacuum pump is forcibly stopped;
and if the brake lamp signal is detected, stopping leakage fault diagnosis and continuously keeping the execution mode judgment of the vacuum pump.
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