CN111409617B - Electric vacuum pump overheating protection control method, system and terminal - Google Patents
Electric vacuum pump overheating protection control method, system and terminal Download PDFInfo
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- CN111409617B CN111409617B CN202010189576.2A CN202010189576A CN111409617B CN 111409617 B CN111409617 B CN 111409617B CN 202010189576 A CN202010189576 A CN 202010189576A CN 111409617 B CN111409617 B CN 111409617B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses an overheating protection control method for an electric vacuum pump, which comprises the following steps: monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time or not; if so, acquiring a brake pedal signal of the vehicle, wherein the brake pedal signal represents the braking requirement of the vehicle; controlling the electric vacuum pump to enter a degraded working mode according to the brake pedal signal; monitoring whether an operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to a safe current threshold; and if so, controlling the electric vacuum pump to enter a current protection working mode. By utilizing the technical scheme provided by the invention, the influence of overheating of the vacuum pump on the service life of the vacuum pump can be effectively avoided, the electric vacuum pump can be ensured to continue working according to the braking requirement, the problem of no assistance force in continuous braking is avoided, the braking safety is met as a primary factor, and the normal operation of vacuum system components is ensured to the maximum extent, so that the safe running of a vehicle is ensured.
Description
Technical Field
The invention relates to the technical field of automobile braking, in particular to an overheat protection control method, an overheat protection control system and an overheat protection control terminal for an electric vacuum pump.
Background
With the support of new energy automobiles in China, the market of electric vehicles shows explosive growth, but a plurality of problems exist behind the rapid growth, such as the field of brake systems. The vacuum boosting effect of the braking system is related to the running safety of the automobile, and different from the traditional fuel oil vehicle, the electric automobile is driven by the motor, and a traditional engine is cancelled, so that the vacuum source is lost, namely the vacuum boosting can not be provided for an automobile brake master cylinder, the electric vacuum pump can make up the defect, and a reliable vacuum source is provided for braking systems of various types of automobiles such as the electric automobile, a hybrid electric automobile and the like, so that the braking performance of the whole automobile is effectively improved. Therefore, if the electric vacuum pump does not work, the realization of the braking function is directly influenced, and the safety of pedestrians is seriously influenced, so that the control of the electric vacuum pump is very important.
The conventional electric vacuum pump stops working once entering an overheating protection mode, when the electric vacuum pump needs to be restarted after stopping working due to overheating protection, the vacuum pump cannot provide vacuum, the condition of no assistance can be generated during braking, and great potential safety hazards exist.
In view of the foregoing, it is desirable to design an overheat protection control method, system and terminal for an electric vacuum pump, which improves the existing situation.
Disclosure of Invention
The present invention provides an overheat protection control method, system and terminal for an electric vacuum pump, aiming at the conventional control method of an electric vacuum pump, so as to solve the problems in the background art.
In one aspect, the present invention provides an overheat protection control method for an electric vacuum pump, which can perform overheat protection control on the electric vacuum pump according to two different control modes, namely, a degraded operation control mode and a current protection operation control mode, wherein the overheat protection control method comprises:
monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time or not;
if so, acquiring a brake pedal signal of the vehicle, wherein the brake pedal signal represents the braking requirement of the vehicle;
controlling the electric vacuum pump to enter a degraded working mode according to the brake pedal signal;
monitoring whether an operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to a safe current threshold;
and if so, controlling the electric vacuum pump to enter a current protection working mode.
Further, the controlling the electric vacuum pump to enter a degraded operating mode according to the brake pedal signal comprises:
if the brake pedal signal is a signal that the vehicle has no braking demand, a working instruction is sent to the electric vacuum pump in a preset period, and the working instruction is as follows: and controlling the electric vacuum pump to continuously work for the first time.
Further, the controlling the electric vacuum pump to enter a degraded operating mode according to the brake pedal signal further comprises:
if the brake pedal signal is a signal that the vehicle has a braking demand, wherein the vehicle has the braking demand and comprises two operation steps of depressing the brake pedal and releasing the brake pedal,
when the brake pedal is stepped on, controlling the electric vacuum pump to continuously work for a second time;
and when the brake pedal is released, controlling the electric vacuum pump to continuously work for a third time and then closing the electric vacuum pump.
Further, the controlling the electric vacuum pump to enter a current protection operating mode includes:
and if the working current of the electric vacuum pump is greater than or equal to a first safe current threshold value, controlling the electric vacuum pump to be closed for a fourth time and then starting the electric vacuum pump.
Further, the controlling the electric vacuum pump to enter a current protection operating mode includes:
and if the working current of the electric vacuum pump is greater than or equal to a second safe current threshold value, and the duration time of the working current greater than or equal to the second safe current threshold value is greater than or equal to a fifth time, controlling the electric vacuum pump to be closed for a sixth time and then starting the electric vacuum pump.
Further, the controlling the electric vacuum pump to enter a current protection operating mode includes:
and if the duration time of the working current greater than or equal to the third safety current threshold is greater than or equal to the seventh time, and the times that the duration time of the working current greater than or equal to the third safety current threshold is greater than or equal to the seventh time reach the preset times, controlling the electric vacuum pump to be closed for the eighth time and then starting the electric vacuum pump.
Further, the overheat protection control method further includes: and when the electric vacuum pump enters any one of the degradation work control mode and the current protection work control mode, sending an electric vacuum pump overheating alarm signal to remind a driver that the electric vacuum pump is in an overheating protection state.
Further, the overheat protection control method further includes: when the electric vacuum pump enters the degradation work control mode, sending an electric vacuum pump overheating alarm signal; and when the electric vacuum pump enters the current protection working control mode, sending an electric vacuum pump limit working alarm signal. The vehicle driver can make more accurate judgment and coping operation for specific conditions according to the alarm signal.
Further, the overheat protection control method further includes:
monitoring whether the working current of the electric vacuum pump is smaller than a safe current threshold value;
and if so, controlling the electric vacuum pump to exit the current protection working mode.
Further, the overheat protection control method further includes:
monitoring whether the working temperature of the electric vacuum pump is lower than a safe temperature threshold value;
and if so, controlling the electric vacuum pump to exit the degradation working mode.
In another aspect, the present invention further provides an overheat protection control system for an electric vacuum pump, including:
the first monitoring module is used for monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time;
the acquisition module is used for acquiring a brake pedal signal of the vehicle if the continuous working time of the electric vacuum pump reaches the overheat protection time, wherein the brake pedal signal represents the braking requirement of the vehicle;
the first control module is used for controlling the electric vacuum pump to enter a degraded working mode according to the brake pedal signal;
a second monitoring module for monitoring whether the operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to a safe current threshold;
and the second control module is used for controlling the electric vacuum pump to enter a current protection working mode if the working current of the electric vacuum pump in the degradation working mode is greater than or equal to the safe current threshold value.
Accordingly, the present invention also provides a computer storage medium having at least one instruction, at least one program, code set or instruction set stored therein, which is loaded by a processor and executes the method for controlling overheat protection of an electric vacuum pump as described above.
Correspondingly, the invention further provides a vehicle-mounted terminal, which comprises a processor and a memory, wherein at least one instruction, at least one program, a code set or an instruction set is stored in the memory, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to realize the overheating protection control method for the electric vacuum pump.
By adopting the method, the system and the terminal for controlling the overheat protection of the electric vacuum pump, when the continuous work of the electric vacuum pump reaches the time threshold, the electric vacuum pump is controlled to degrade according to the braking requirement, the situation that the service life of the vacuum pump is influenced due to overheat of the vacuum pump is effectively avoided, meanwhile, the electric vacuum pump can be ensured to continuously work according to the braking requirement, the problem of no assistance in continuous braking is avoided, when a vehicle is in a limit working condition, namely, the working current of the electric vacuum pump is continuously increased due to repeated braking in a degradation working mode, the electric vacuum pump is controlled to enter a current protection working mode when the working current reaches a safe current threshold, a fuse is prevented from being fused due to overlarge working current of the electric vacuum pump, and the circuit. According to the overheat protection control method for the electric vacuum pump, relay protection is carried out on the electric vacuum pump according to two different working control modes, so that the requirement for braking safety is taken as a primary factor, and normal operation of components of a vacuum system is guaranteed to the maximum extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart of a method for controlling overheat protection of an electric vacuum pump according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another method for controlling overheat protection of an electric vacuum pump according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an overheat protection control system for an electric vacuum pump according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first control module in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another overheat protection control system for an electric vacuum pump according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of an electric vacuum pump according to an embodiment of the present invention.
The following is a supplementary description of the drawings:
3-electric vacuum pump overheating protection control system, 310-first monitoring module, 320-acquisition module, 330-first control module, 331-first control unit, 332-second control unit, 340-second monitoring module, 350-second control module, 510-electric vacuum pump, 520-vacuum pipeline, 530-pedal switch, 540-brake pedal, 550-vacuum booster, 560-line switch, 570-vacuum degree sensor, 580-vehicle controller.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope 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 the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example (b):
fig. 1 is a schematic flow chart of an embodiment of the present invention for providing a method for controlling overheat protection of an electric vacuum pump, and the present specification provides the operation steps of the method as described in the embodiment or the flowchart, but more or less operation steps can be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. In practice, the system or server product may be implemented in a sequential or parallel manner (e.g., parallel processor or multi-threaded environment) according to the embodiments or methods shown in the figures. Specifically, as shown in fig. 1, the method may include:
s101: monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time or not;
when an existing electric vacuum pump, such as a vane-type electric vacuum pump, works, a graphite stator and a rotor generate heat through friction, the temperature rise is large after long-time operation, and overheat protection control is required to be performed when a certain value is reached so as to avoid ablation of the vacuum pump, so that in this embodiment, the continuous working time of the electric vacuum pump is used as a reference condition to measure whether the electric vacuum pump reaches an overheat state and needs overheat protection; of course, in other embodiments, the operating temperature of the electric vacuum pump may be directly monitored to determine whether the electric vacuum pump needs to be over-temperature protected. The overheat protection time is an inherent parameter of the electric vacuum pump.
In some embodiments, when the electric vacuum pump normally works, the vehicle control unit obtains the vacuum degree of the vacuum booster through a vacuum degree sensor, controls the working state of the electric vacuum pump in real time according to the vacuum degree, starts the electric vacuum pump when the vacuum degree is smaller than the lower limit of a safety threshold, and stops working when the vacuum degree is larger than the upper limit of the safety threshold, wherein the continuous working time of the electric vacuum pump refers to the accumulated working time of the electric vacuum pump within a preset time period.
In some embodiments, when the electric vacuum pump works normally, the switch of the vacuum pump is controlled according to the residual capacity of the power battery, and when the power battery is enough in power, the vacuum pump is in an on state for a long time, wherein the continuous working time of the electric vacuum pump refers to the continuous working time of the electric vacuum pump from the on state.
S103: if so, acquiring a brake pedal signal of the vehicle, wherein the brake pedal signal represents the braking requirement of the vehicle;
s105: controlling the electric vacuum pump to enter a degraded working mode according to the brake pedal signal;
when the continuous working time of the electric vacuum pump reaches the overheat protection time, the working signal condition of the electric vacuum pump refers to a brake pedal BLS signal to enter a degraded working mode, wherein when the brake pedal signal BLS is 0, the working signal is a brake pedal switch-free signal, and the brake pedal signal is a signal of a vehicle without braking demand; when a brake pedal signal BLS is equal to 1, namely the brake pedal is pressed, the vehicle is judged to have a braking demand, and the brake pedal signal is a signal that the vehicle has the braking demand, wherein the vehicle has the braking demand and comprises two operation steps of pressing the brake pedal and releasing the brake pedal.
The step of controlling the electric vacuum pump to enter the degraded working mode according to the brake pedal signal mainly comprises the following steps:
if BLS is 0, namely when the brake pedal signal is a signal that the vehicle has no braking demand, a working instruction is sent to the electric vacuum pump in a preset period, wherein the working instruction is as follows: and controlling the electric vacuum pump to continuously work for the first time.
If BLS is 1, i.e. the brake pedal signal is a signal that the vehicle has a braking demand,
when the brake pedal is stepped on, controlling the electric vacuum pump to continuously work for a second time;
and when the brake pedal is released, controlling the electric vacuum pump to continuously work for a third time and then closing the electric vacuum pump.
The preset period, the first time, the second time and the third time are calibrated according to technical parameters of an electric vacuum pump, and the calibration is performed on the premise that the vehicle can obtain enough braking force, so that the vehicle can be ensured to run safely.
S107: monitoring whether an operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to a safe current threshold;
s109: and if so, controlling the electric vacuum pump to enter a current protection working mode.
Under the condition that the electric vacuum pump enters the degradation working mode but the vehicle still has a braking requirement, the working current of the electric vacuum pump is continuously increased, and when the working current is too large, a fuse is easily triggered to be fused, so that the circuit of the electric vacuum pump is disconnected and stops working.
In some embodiments, the controlling the electric vacuum pump into a current protection mode of operation comprises:
and if the working current of the electric vacuum pump is greater than or equal to a first safe current threshold value, controlling the electric vacuum pump to be closed for a fourth time and then starting the electric vacuum pump.
In some embodiments, the controlling the electric vacuum pump into a current protection mode of operation comprises:
and if the working current of the electric vacuum pump is greater than or equal to a second safe current threshold value, and the duration time of the working current greater than or equal to the second safe current threshold value is greater than or equal to a fifth time, controlling the electric vacuum pump to be closed for a sixth time and then starting the electric vacuum pump.
In some embodiments, the controlling the electric vacuum pump into a current protection mode of operation comprises:
and if the duration time of the working current greater than or equal to the third safety current threshold is greater than or equal to the seventh time, and the times that the duration time of the working current greater than or equal to the third safety current threshold is greater than or equal to the seventh time reach the preset times, controlling the electric vacuum pump to be closed for the eighth time and then starting the electric vacuum pump.
The first safety current threshold, the fourth time, the second safety current threshold, the fifth time, the sixth time, the third safety current threshold, the seventh time, the preset times and the eighth time are calibrated according to technical parameters of an electric vacuum pump, and the calibration is performed on the premise that the vehicle can obtain enough braking force and the electric vacuum pump circuit is normally open, so that the braking safety is met as a primary factor, and the normal operation of vacuum system components is guaranteed to the maximum extent, so that the safe running of the vehicle is guaranteed. Of course, the above-mentioned safe current threshold, time, and preset times may also be set in other ways, and are not described herein again.
In some embodiments, the overheat protection control method further includes: and when the electric vacuum pump enters any one of the degradation work control mode and the current protection work control mode, sending an electric vacuum pump overheating alarm signal to an instrument desk to remind a driver that the electric vacuum pump is in an overheating protection state.
In some embodiments, the overheat protection control method further includes: when the electric vacuum pump enters the degradation work control mode, sending an electric vacuum pump overheating alarm signal; and when the electric vacuum pump enters the current protection working control mode, sending an electric vacuum pump limit working alarm signal. The vehicle driver can make more accurate judgment and coping operation for specific conditions according to the alarm signal.
In some embodiments, the overheat protection control method further includes:
monitoring whether the working current of the electric vacuum pump is smaller than a safe current threshold value;
and if so, controlling the electric vacuum pump to exit the current protection working mode.
In some embodiments, the overheat protection control method further includes:
monitoring whether the working temperature of the electric vacuum pump is lower than a safe temperature threshold value;
and if so, controlling the electric vacuum pump to exit the degradation working mode.
Fig. 2 is a schematic flow chart of an overheat protection control method for an electric vacuum pump according to the above embodiment, and specifically, in conjunction with fig. 2, the method may include:
s201: monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time or not;
s203: if so, acquiring a brake pedal BLS signal of the vehicle, wherein the brake pedal BLS signal represents the braking requirement of the vehicle;
s205: controlling the electric vacuum pump to enter a degradation working mode according to the BLS signal, wherein the degradation working mode specifically comprises the following steps:
if BLS is 0, the vehicle has no braking demand, controlling the electric vacuum pump to work for 10s at an interval of 90s, and circulating infinitely;
if BLS is 1, the vehicle has a braking demand, controlling the electric vacuum pump to continuously work for 5s when the brake pedal is pressed, and controlling the electric vacuum pump to delay to turn off for 3s when the brake pedal is released;
s207: monitoring whether the working current of the electric vacuum pump in the degradation working mode is greater than or equal to a preset current threshold value;
s209: if the duration time of the working current reaching the preset current threshold value is greater than or equal to 0.5s, and the frequency of the working current reaching the preset current threshold value for the duration time of the working current being greater than or equal to 0.5s reaches 6 times, controlling the electric vacuum pump to enter a current protection working mode, wherein the current protection working mode specifically comprises the following steps: and controlling the electric vacuum pump to stop working, and starting the electric vacuum pump to work after 10 s.
In step S209, if the "duration time of the working current reaching the preset current threshold is greater than or equal to 0.5S, and the number of times that the duration time of the working current reaching the preset current threshold is greater than or equal to 0.5S reaches 6" occurs within a specified time period, the electric vacuum pump is controlled to enter the current protection operating mode.
In a possible implementation mode, the vehicle control unit monitors the working current change of the electric vacuum pump in real time, when the working current exceeds a set value, the electric vacuum pump stops working and stops working after a period of time, namely whether the electric vacuum pump is in a degradation working mode or not, once the working current is too high, the electric vacuum pump is controlled to stop working, the limitation is removed after a certain period of time, the electric vacuum pump is started to work, the fuse is guaranteed not to be triggered, a preventive measure is provided for the condition that the electric vacuum pump breaks down, the electric vacuum pump cannot normally run due to abnormal current is prevented, and the circuit of the electric vacuum pump is guaranteed to be normally open.
An embodiment of the present invention further provides an overheat protection control system for an electric vacuum pump, as shown in fig. 3, the overheat protection control system for an electric vacuum pump includes:
the first monitoring module 310 is used for monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time;
an obtaining module 320, configured to obtain a brake pedal signal of a vehicle if a continuous operating time of the electric vacuum pump reaches an overheat protection time, where the brake pedal signal represents a braking demand of the vehicle;
a first control module 330 for controlling the electric vacuum pump to enter a degraded operating mode according to the brake pedal signal;
a second monitoring module 340 for monitoring whether the operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to a safe current threshold;
a second control module 350, configured to control the electric vacuum pump to enter a current protection operating mode if the operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to the safe current threshold.
In some embodiments, as shown in fig. 4, the first control module 330 includes:
the first control unit 331 may be configured to send a working instruction to the electric vacuum pump at a preset period when the brake pedal signal is a signal that the vehicle has no braking demand, where the working instruction is: controlling the electric vacuum pump to continuously work for a first time;
the second control unit 332 may be configured to control the electric vacuum pump to continuously operate for a second time when the brake pedal signal is a signal that the vehicle has a braking demand and the brake pedal is pressed; and when the brake pedal is released, controlling the electric vacuum pump to continuously work for a third time and then closing the electric vacuum pump.
In some embodiments, the second control module 350 may be configured to: and if the working current of the electric vacuum pump is greater than or equal to a first safe current threshold value, controlling the electric vacuum pump to be closed for a fourth time and then starting the electric vacuum pump.
In some embodiments, the second control module 350 may be configured to: and if the working current of the electric vacuum pump is greater than or equal to a second safe current threshold value, and the duration time of the working current greater than or equal to the second safe current threshold value is greater than or equal to a fifth time, controlling the electric vacuum pump to be closed for a sixth time and then starting the electric vacuum pump.
In some embodiments, the second control module 350 may be configured to: and if the duration time of the working current greater than or equal to the third safety current threshold is greater than or equal to the seventh time, and the times that the duration time of the working current greater than or equal to the third safety current threshold is greater than or equal to the seventh time reach the preset times, controlling the electric vacuum pump to be closed for the eighth time and then starting the electric vacuum pump.
In some embodiments, the overheat protection control system for the electric vacuum pump further includes an alarm signal sending module, and the alarm signal sending module may be configured to send an overheat alarm signal for the electric vacuum pump to an instrument desk when the electric vacuum pump enters any one of the degraded operation control mode and the current protection operation control mode, so as to remind a driver that the electric vacuum pump is in an overheat protection state.
In some other embodiments, the alarm signal sending module includes an electric vacuum pump overheating alarm signal sending unit and an electric vacuum pump ultimate operation alarm signal sending unit, and the electric vacuum pump overheating alarm signal sending unit is configured to send an electric vacuum pump overheating alarm signal when the electric vacuum pump enters the degraded operation control mode; and the electric vacuum pump limit working alarm signal sending unit is used for sending an electric vacuum pump limit working alarm signal when the electric vacuum pump enters the current protection working control mode. The vehicle driver can make more accurate judgment and coping operation for specific conditions according to the alarm signal.
In some embodiments, the second monitoring module 340 may be further configured to monitor whether the working current of the electric vacuum pump is smaller than a safe current threshold, and if so, transmit the detected signal to the vehicle controller, and the vehicle controller controls the electric vacuum pump to exit the current protection working mode.
In some embodiments, the overheat protection control system for the electric vacuum pump further includes a temperature sensor, where the temperature sensor may be configured to monitor whether an operating temperature of the electric vacuum pump is lower than a safe temperature threshold, and if so, transmit a detected signal to the vehicle controller, and the vehicle controller controls the electric vacuum pump to exit the degraded operating mode.
In one specific embodiment, as shown in fig. 5, the overheat protection control system for the electric vacuum pump comprises the following components: the system comprises an electric vacuum pump 510, a vacuum pipeline 520, a pedal switch 530, a brake pedal 540, a vacuum booster 550, a line switch 560, a vacuum degree sensor 570 and a vehicle control unit 580. The electric vacuum pump 510 is used for extracting vacuum of the vacuum booster 550 through the vacuum pipeline 520, and the vacuum pipeline 520 is a vacuum connecting channel; the pedal switch 530 is configured to receive a pedaling signal of the brake pedal 540 and transmit the signal to the vehicle control unit 580, where when the brake pedal 540 is pedaled, a pedal switch signal BLS is 1, and when there is no pedal switch signal BLS is 0; the brake pedal is a device for transmitting and amplifying braking force; the vacuum booster 550 is a device for converting pedal mechanical force into hydraulic force; the line switch 560 is a device for transmitting and feeding back electric signals of each component; the vacuum degree sensor 570 is used for detecting the vacuum degree of the vacuum booster, converting a vacuum degree signal into a voltage signal and transmitting the voltage signal to the vehicle control unit; the vehicle control unit 580 collects and processes the signals.
Fig. 6 is a control circuit diagram of an electric vacuum pump corresponding to the above embodiment, which includes a power supply KL30, a vehicle controller 580 connected to the power supply, a vacuum degree sensor 570, a relay, and an electric vacuum pump 510 controlled by the relay, where the vehicle controller obtains vacuum degree and pedal information through the vacuum degree sensor, calculates the operation time, start-stop threshold, and the like of the electric vacuum pump, and when the continuous operation time of the electric vacuum pump exceeds a certain time threshold, the vehicle control unit controls the relay to close, so as to implement overheat protection control of the electric vacuum pump, specifically see fig. 6. The vehicle control unit 580 collects signals from the vacuum degree sensor 570, the pedal switch 530, and the like, and realizes self-checking, start/stop control, safety protection control, and fault alarm control of the electric vacuum pump through preset control logic. The safety protection control comprises overheat protection, vacuum degree signal-free and pedal-free signal control; the overheating protection control monitors the continuous working time of the electric vacuum pump 510 through the vehicle controller 580, and when the continuous working time of the electric vacuum pump 510 exceeds a set value, in order to protect the electric vacuum pump 510 from influencing the service life thereof due to continuous temperature rise, the vehicle controller 580 executes the overheating protection measures of the electric vacuum pump through degradation work and current protection work according to the overheating protection control method for the electric vacuum pump, so as to ensure the effective operation of the vacuum system.
The system and method embodiments in the described system embodiment are based on the same inventive concept.
The embodiment of the invention also provides a vehicle-mounted terminal, which comprises a processor and a memory, wherein at least one instruction, at least one section of program, a code set or an instruction set is stored in the memory, and the at least one instruction, the at least one section of program, the code set or the instruction set is loaded and executed by the processor to realize the overheating protection control method for the electric vacuum pump.
According to the embodiment of the overheat protection control method, the overheat protection control system and the terminal for the electric vacuum pump, relay protection is carried out on the electric vacuum pump according to two different control modes, the situation that the service life of the vacuum pump is influenced by overheating is effectively avoided, meanwhile, the electric vacuum pump can be ensured to continuously work according to braking requirements, the problem that no power is provided during continuous braking is avoided, when a vehicle is in a limit working condition, the situation that a fuse is fused due to the fact that the working current of the electric vacuum pump is too large can be prevented, and the situation that a circuit of the electric vacuum pump is normally open is ensured. The technical scheme of the invention takes the requirement on braking safety as a primary factor, and ensures normal operation of vacuum system components to the maximum extent, thereby ensuring safe running of the vehicle.
It should be noted that: the precedence order of the above embodiments of the present invention is only for description, and does not represent the merits of the embodiments. And specific embodiments thereof have been described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, system and server embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for relevant points.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. An overheating protection control method for an electric vacuum pump, the overheating protection control method comprising:
monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time or not;
if so, acquiring a brake pedal signal of the vehicle, wherein the brake pedal signal represents the braking requirement of the vehicle;
controlling the electric vacuum pump to enter a degraded mode of operation based on the brake pedal signal, the controlling the electric vacuum pump to enter a degraded mode of operation comprising: if the brake pedal signal is a signal that the vehicle has a braking demand, controlling the electric vacuum pump to continuously work for a second time when the brake pedal is stepped; when the brake pedal is released, controlling the electric vacuum pump to continuously work for a third time and then closing the electric vacuum pump;
monitoring whether an operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to a safe current threshold;
if yes, controlling the electric vacuum pump to enter a current protection working mode, wherein the controlling the electric vacuum pump to enter the current protection working mode comprises the following steps: and controlling the electric vacuum pump to be closed for a preset time and then starting the electric vacuum pump.
2. The method of claim 1, wherein the controlling the electric vacuum pump to enter a degraded mode of operation based on the brake pedal signal comprises:
if the brake pedal signal is a signal that the vehicle has no braking demand, a working instruction is sent to the electric vacuum pump in a preset period, and the working instruction is as follows: and controlling the electric vacuum pump to continuously work for the first time.
3. An electric vacuum pump overheating protection control method in accordance with claim 1, wherein said controlling said electric vacuum pump to enter a current protection mode of operation comprises:
and if the working current of the electric vacuum pump is greater than or equal to a first safe current threshold value, controlling the electric vacuum pump to be closed for a fourth time and then starting the electric vacuum pump.
4. An electric vacuum pump overheating protection control method in accordance with claim 1, wherein said controlling said electric vacuum pump to enter a current protection mode of operation comprises:
and if the working current of the electric vacuum pump is greater than or equal to a second safe current threshold value, and the duration time of the working current greater than or equal to the second safe current threshold value is greater than or equal to a fifth time, controlling the electric vacuum pump to be closed for a sixth time and then starting the electric vacuum pump.
5. An electric vacuum pump overheating protection control method in accordance with claim 1, wherein said controlling said electric vacuum pump to enter a current protection mode of operation comprises:
and if the duration time of the working current of the electric vacuum pump is greater than or equal to a third safety current threshold value is greater than or equal to a seventh time, and the number of times that the duration time of the current of the working current of the electric vacuum pump is greater than or equal to the seventh time reaches a preset number of times, controlling the electric vacuum pump to be closed for the eighth time and then starting the electric vacuum pump.
6. An electric vacuum pump overheating protection control method in accordance with claim 1, further comprising:
and when the electric vacuum pump enters any one of the degradation working mode and the current protection working mode, sending an overheat alarm signal of the electric vacuum pump.
7. An electric vacuum pump overheating protection control method in accordance with claim 1, further comprising:
monitoring whether the working temperature of the electric vacuum pump is lower than a safe temperature threshold value;
and if so, controlling the electric vacuum pump to exit the degradation working mode.
8. An electric vacuum pump overheating protection control system, comprising:
the first monitoring module is used for monitoring whether the continuous working time of the electric vacuum pump reaches the overheat protection time;
the acquisition module is used for acquiring a brake pedal signal of the vehicle if the continuous working time of the electric vacuum pump reaches the overheat protection time, wherein the brake pedal signal represents the braking requirement of the vehicle;
a first control module configured to control the electric vacuum pump to enter a degraded operating mode according to the brake pedal signal, wherein the controlling the electric vacuum pump to enter the degraded operating mode includes: if the brake pedal signal is a signal that the vehicle has a braking demand, controlling the electric vacuum pump to continuously work for a second time when the brake pedal is stepped; when the brake pedal is released, controlling the electric vacuum pump to continuously work for a third time and then closing the electric vacuum pump;
a second monitoring module for monitoring whether the operating current of the electric vacuum pump in the degraded operating mode is greater than or equal to a safe current threshold;
a second control module, configured to control the electric vacuum pump to enter a current protection operating mode if a working current of the electric vacuum pump in the degraded operating mode is greater than or equal to the safe current threshold, where the controlling the electric vacuum pump to enter the current protection operating mode includes: and controlling the electric vacuum pump to be closed for a preset time and then starting the electric vacuum pump.
9. An in-vehicle terminal, characterized in that the terminal comprises a processor and a memory, wherein the memory stores at least one instruction, at least one program, a set of codes or a set of instructions, and the at least one instruction, the at least one program, the set of codes or the set of instructions is loaded and executed by the processor to realize the method for controlling overheat protection of an electric vacuum pump according to any one of claims 1 to 7.
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| CN202010189576.2A CN111409617B (en) | 2020-03-17 | 2020-03-17 | Electric vacuum pump overheating protection control method, system and terminal |
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| JP2007276682A (en) * | 2006-04-10 | 2007-10-25 | Aisan Ind Co Ltd | Negative pressure supply device for brake booster |
| CN103072563B (en) * | 2013-02-06 | 2015-04-08 | 浙江吉利汽车研究院有限公司杭州分公司 | Method for controlling electric vacuum pump based on ECU (Electronic Control Unit) control |
| CN106998170B (en) * | 2016-08-31 | 2019-08-20 | 南京奥联汽车电子技术有限公司 | Direct current generator method for excessive heating protection and implementation step based on feedback current |
| CN108388189A (en) * | 2018-05-03 | 2018-08-10 | 广东新宝电器股份有限公司 | Control method and control circuit of food processor and food processor |
| CN109552304A (en) * | 2018-12-29 | 2019-04-02 | 汉腾汽车有限公司 | New-energy automobile brakes digital electric vacuum assistance system and its control method |
| CN110194137B (en) * | 2019-05-29 | 2021-01-29 | 中国第一汽车股份有限公司 | Vacuum pump temperature control method and device, vehicle and storage medium |
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