CN109334648B - Control method and system for air pump of new energy automobile - Google Patents
Control method and system for air pump of new energy automobile Download PDFInfo
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- CN109334648B CN109334648B CN201811123763.XA CN201811123763A CN109334648B CN 109334648 B CN109334648 B CN 109334648B CN 201811123763 A CN201811123763 A CN 201811123763A CN 109334648 B CN109334648 B CN 109334648B
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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
- B60T13/26—Compressed-air systems
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a control method of a new energy automobile air pump, which comprises the following steps: controlling a target air pump according to a target pressure switch; acquiring a first pressure value of a front axle braking air cylinder and a second pressure value of a rear axle braking air cylinder; judging whether the normally-off state of the target pressure switch fails or not according to the first pressure value and the second pressure value; and if so, converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor. According to the method, the target air pump is controlled according to the target pressure switch, when the normally-off state of the target pressure switch is judged to be invalid according to the first pressure value and the second pressure value, the control of the target air pump is converted from the control of the target pressure switch to the control of the target pressure sensor, and the problems that when only a sensor or a pressure switch is adopted for control, if the air pressure sensor or the pressure switch is in failure, the air pump does not work when the system is under-voltage, and therefore the braking operation of a vehicle and the safety of the vehicle are influenced are solved.
Description
Technical Field
The invention relates to the technical field of air pump control, in particular to a control method and a control system for an air pump of a new energy automobile.
Background
The air pressure braking system is one kind of vehicle braking system, and has the main advantages of capacity of obtaining great braking force during braking, capacity of inflating the air cylinder with compressed air of certain pressure, dependence of the air pump on the air pressure sensor on the air cylinder, or the pressure switch on the drier or the air pipe, and capacity of acquiring system pressure or controlling the on-off condition of the air pump to control the operation of the air pump.
The inventor researches the control process of the existing air pump to find that if the air pressure sensor or the pressure switch has a fault, for example: the pressure switch is still in a disconnection state when the system is under-voltage or the pressure value fed back by the air pressure sensor is higher (pressure value drifting) when the system is under-voltage, and the air pump does not work when the system is under-voltage, so that the vehicle braking operation and the vehicle safety are influenced.
Disclosure of Invention
In view of the above, the invention provides a control method and a control system for an air pump of a new energy automobile, which are used for solving the problem that in the prior art, if an air pressure sensor or a pressure switch fails, the air pump does not work when the system is under-voltage, so that the braking operation of the vehicle and the safety of the vehicle are affected. The specific scheme is as follows:
a control method of an air pump of a new energy automobile comprises the following steps:
controlling a target air pump according to a target pressure switch;
acquiring a first pressure value of a front axle braking air cylinder and a second pressure value of a rear axle braking air cylinder;
judging whether the normally-off state of the target pressure switch fails or not according to the first pressure value and the second pressure value;
and if so, converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor.
The above method, optionally, further includes:
if not, the target air pump is continuously controlled according to the target pressure switch.
The method optionally includes, that the controlling the target air pump according to the target pressure switch includes:
acquiring a system pressure value, wherein the system pressure value is a pressure value in a main air path;
comparing the system pressure value with a preset first pressure threshold value and/or a preset second pressure threshold value;
when the system pressure value is smaller than the preset first pressure threshold value, the target pressure switch is switched on;
and when the system pressure value is larger than the preset second pressure threshold value, the target pressure switch is switched off.
Optionally, the method for determining whether the normally-off state of the target pressure switch fails according to the first pressure value and the second pressure value includes:
judging whether the state of the target pressure switch is an off state;
if so, judging whether the minimum value of the first pressure value and the second pressure value is smaller than a preset third pressure threshold value or not and whether the first pressure value and the second pressure value belong to a preset pressure threshold value interval or not;
and if so, judging that the normally-off state of the target switch is invalid.
The method optionally converts the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor, and includes:
when an instruction corresponding to the failure of the normally-off state of the target pressure switch is received, acquiring a first pressure value of a front axle braking air cylinder and a second pressure value of a rear axle braking air cylinder;
comparing the minimum value of the first pressure value and the second pressure value with a preset fourth pressure threshold value and/or a preset fifth pressure threshold value;
if the minimum value of the first pressure value and the second pressure value is larger than the preset fourth pressure threshold value, stopping the target air pump;
and if the minimum value of the first pressure value and the second pressure value is smaller than the preset fifth pressure threshold value, the target air pump starts to work.
A control system of a new energy automobile air pump comprises:
the first control module is used for controlling the target air pump according to the target pressure switch;
the acquisition module is used for acquiring a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder;
the judging module is used for judging whether the normally-off state of the target pressure switch fails or not according to the first pressure value and the second pressure value;
and the conversion module is used for converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor if the target air pump is controlled by the target pressure switch.
The above system, optionally, further includes:
and the second control module is used for continuously controlling the target air pump according to the target pressure switch if the target air pump is not controlled.
In the above system, optionally, the first control module includes:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring a system pressure value, and the system pressure value is a pressure value in a main air path;
the first comparison unit is used for comparing the system pressure value with a preset first pressure threshold value and/or a preset second pressure threshold value;
the switching-on unit is used for switching on the target pressure switch when the system pressure value is smaller than the preset first pressure threshold value;
and the disconnection unit is used for disconnecting the target pressure switch when the system pressure value is greater than the preset second pressure threshold value.
Optionally, the above system, wherein the determining module includes:
a first judgment unit configured to judge whether or not the state of the target pressure switch is an off state;
a second judging unit, configured to judge whether a minimum value of the first pressure value and the second pressure value is smaller than a preset third pressure threshold and whether the first pressure value and the second pressure value belong to a preset pressure threshold interval if yes;
and the failure unit is used for judging that the normally-off state of the target switch fails if the target switch is in the normally-off state.
The above system, optionally, the conversion module includes:
the second acquisition unit is used for acquiring a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder when receiving an instruction corresponding to the failure of the normally-off state of the target pressure switch;
the second comparison unit is used for comparing the minimum value of the first pressure value and the second pressure value with a preset fourth pressure threshold value and/or a preset fifth pressure threshold value;
the stopping unit is used for stopping the target air pump if the minimum value of the first pressure value and the second pressure value is larger than the preset fourth pressure threshold value;
and the starting unit is used for starting the target air pump to work if the minimum value of the first pressure value and the second pressure value is smaller than the preset fifth pressure threshold value.
Compared with the prior art, the invention has the following advantages:
the invention discloses a control method of a new energy automobile air pump, which comprises the following steps: controlling a target air pump according to a target pressure switch; and acquiring a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder, and when the normally-off state of the target pressure switch is judged to be invalid according to the first pressure value and the second pressure value, converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor. The control method avoids the problem that when only a sensor or a pressure switch is adopted for control, if the air pressure sensor or the pressure switch breaks down, the air pump does not work when the system is under-voltage, so that the braking operation of the vehicle and the safety of the vehicle are influenced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a control method of an air pump of a new energy vehicle disclosed in an embodiment of the present application;
fig. 2 is another flowchart of a control method of an air pump of a new energy vehicle disclosed in an embodiment of the present application;
fig. 3 is another flowchart of a control method of an air pump of a new energy vehicle disclosed in the embodiment of the present application;
fig. 4 is another flowchart of a control method of an air pump of a new energy vehicle disclosed in the embodiment of the present application;
fig. 5 is a schematic control logic diagram of an air pump of a new energy vehicle disclosed in an embodiment of the present application;
fig. 6 is a block diagram of a control system of an air pump of a new energy vehicle according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The invention provides a control method and a control system of an air pump of a new energy automobile, which are applied to the braking process of the new energy automobile, wherein the braking process is realized according to an air braking system, and because a safety valve is arranged on an air storage cylinder in the air braking system, when the air pressure of the system is overhigh, the safety valve is opened, and the system releases the pressure. Therefore, from the safety aspect, a failure in which the pressure switch is turned off at the time of system undervoltage or a failure in which the switch-on pressure value drifts downward is prioritized. Based on the above problems, the present invention provides a control method for an air pump of a new energy automobile, where the execution flow of the method is shown in fig. 1, and the method includes the steps of:
s101, controlling a target air pump according to a target pressure switch;
in an embodiment of the present invention, the target air pump is an air pump that needs to be currently controlled, the target pressure switch is a switch that controls the target air pump, wherein the target air pump is controlled in an initial state according to the target pressure switch, the target pressure switch may be installed on a dryer or an air pipe of a pneumatic brake system, when the target pressure switch is closed, the target air pump starts to operate, and when the target pressure switch is disconnected, the target air pump stops operating.
S102, acquiring a first pressure value of a front axle braking air storage cylinder and a second pressure value of a rear axle braking air storage cylinder;
in the embodiment of the invention, the air braking system comprises a front axle braking air cylinder and a rear axle braking air cylinder, pressure sensors are respectively arranged on the front axle braking air cylinder and the rear axle braking air cylinder, a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder are obtained by reading the values of the corresponding pressure sensors, and the pressure sensor corresponding to the target air pump is a target pressure sensor.
S103, judging whether the normally-off state of the target pressure switch fails or not according to the first pressure value and the second pressure value;
in the embodiment of the present invention, corresponding pressure values in the first pressure value and the second pressure value are respectively compared with a preset third pressure threshold and a preset pressure threshold interval, and according to a comparison result, whether a normally-off state of the target pressure switch fails is determined, where the preset third pressure threshold and the preset pressure threshold interval are set according to an empirical value or a specific condition, preferably, in the embodiment of the present invention, the third pressure threshold is 5.5bar, and the preset pressure threshold interval is 2-11 bar.
And S104, if so, converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor.
In the embodiment of the invention, if the target pressure switch fails, the control instruction of the target pressure switch is disabled, and the control of the target air pump is converted from the control of the target pressure switch to the control of a target pressure sensor, wherein the target pressure sensor is a pressure sensor arranged on the front axle braking air storage cylinder and a pressure sensor arranged on the rear axle braking air storage cylinder.
In the embodiment of the present invention, if the target pressure switch is not failed, the target air pump is continuously controlled according to the target pressure switch, and the method described in S101-S104 is continuously executed to control the target air pump.
The invention discloses a control method of a new energy automobile air pump, which comprises the following steps: controlling a target air pump according to a target pressure switch; and acquiring a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder, and when the normally-off state of the target pressure switch is judged to be invalid according to the first pressure value and the second pressure value, converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor. The control method avoids the problem that when only a sensor or a pressure switch is adopted for control, if the air pressure sensor or the pressure switch breaks down, the air pump does not work when the system is under-voltage, so that the braking operation of the vehicle and the safety of the vehicle are influenced.
In the embodiment of the present invention, a flow of a method for controlling a target air pump according to a target pressure switch is shown in fig. 2, and the method includes the steps of:
s201, acquiring a system pressure value, wherein the system pressure value is a pressure value in a main air path;
in the embodiment of the invention, the target pressure switch has a function of identifying the system pressure value, the system pressure value can be obtained according to the target pressure switch, and the system pressure value can also be obtained by installing the pressure sensor in the main gas path.
S202, comparing the system pressure value with a preset first pressure threshold value and/or a preset second pressure threshold value;
in an embodiment of the present invention, the target pressure switch includes the preset first pressure threshold and the preset second pressure threshold, and the system pressure threshold is compared with the preset first pressure threshold and/or the preset second pressure threshold, wherein if the system pressure value is compared with the preset first pressure threshold or the preset second pressure threshold, and when a requirement of turning off or turning on the target pressure switch is already met, it is not necessary to compare another preset first pressure threshold or the preset second pressure threshold, and if the requirement is not met, it is also necessary to compare another preset first pressure threshold or the preset second pressure threshold, wherein the preset first pressure threshold and the preset second pressure threshold are set according to an empirical value or a specific condition, preferably, in an embodiment of the present invention, the preset first pressure threshold is 6.5bar, and the preset second pressure threshold is 8.5 bar.
S203, when the system pressure value is smaller than the preset first pressure threshold value, the target pressure switch is switched on;
in the embodiment of the present invention, the system pressure value is compared with the preset first pressure threshold, when the system pressure value is smaller than the preset first pressure threshold, the target pressure switch is turned on, and when an on instruction of the target pressure switch is detected, the target air pump is started to operate.
And S204, when the system pressure value is larger than the preset second pressure threshold value, the target pressure switch is disconnected.
In the embodiment of the present invention, the system pressure value is compared with the preset second pressure threshold, when the system pressure value is greater than the preset second pressure threshold, the target pressure switch is turned off, and when an off instruction of the target pressure switch is detected, the target air pump is stopped.
In the implementation of the present invention, preferably, when the system pressure value, the first pressure value, and the second pressure value are in good tightness of the pneumatic brake system, the values of the system pressure value, the first pressure value, and the second pressure value are identical, and the values of the system pressure value, the first pressure value, and the second pressure value fluctuate within an error allowable range in an actual process.
In the embodiment of the present invention, a flow of a method for determining whether a normally-off state of the target pressure switch fails according to the first pressure value and the second pressure value is shown in fig. 3, and includes steps;
s301, judging whether the state of the target pressure switch is an off state;
in the embodiment of the invention, the state of the target pressure switch is analyzed, the state can be an open state or a closed state, and whether the state of the target pressure switch is the open state or not is judged.
S302, if yes, judging whether the minimum value of the first pressure value and the second pressure value is smaller than a preset third pressure threshold value or not and whether the first pressure value and the second pressure value belong to a preset pressure threshold value interval or not;
in the embodiment of the present invention, if the target pressure switch is in the off state, it is determined whether the minimum value of the first pressure value and the second pressure value is smaller than a preset third pressure threshold and whether the first pressure value and the second pressure value belong to a preset pressure threshold interval;
s303, if yes, judging that the normally-off state of the target switch is invalid;
in the embodiment of the present invention, if the minimum value of the first pressure value and the second pressure value is smaller than the preset third pressure threshold and both the first pressure value and the second pressure value belong to the pressure threshold interval of the cell, the normally-off state of the target switch is failed, and if any one of the determination conditions does not satisfy the requirement, the normally-off state of the target switch cannot be determined to be failed.
In the embodiment of the present invention, a flow of a method for converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor is shown in fig. 4, and includes the steps of:
s401, when an instruction corresponding to failure of a normally-off state of the target pressure switch is received, acquiring a first pressure value of a front axle brake air cylinder and a second pressure value of a rear axle brake air cylinder;
in the embodiment of the invention, when the normally-off state of the target pressure switch fails, a corresponding instruction is generated, and when the instruction corresponding to the normally-off state failure of the target pressure switch is received, a first pressure value of the front axle brake air cylinder and a second pressure value of the rear axle brake air cylinder are obtained.
S402, comparing the minimum value of the first pressure value and the second pressure value with a preset fourth pressure threshold value and/or a preset fifth pressure threshold value;
in the embodiment of the present invention, the first pressure value and the second pressure value are compared, a minimum value is selected, and the minimum value is compared with a preset fourth pressure threshold and/or a preset fifth pressure threshold, wherein if the minimum value is compared with the preset fourth pressure threshold or the preset fifth pressure threshold, a condition that the target air pump starts or stops working is already satisfied, it is not necessary to compare another preset fourth pressure threshold or the preset fifth pressure threshold, if the requirement is not satisfied, another preset fourth pressure threshold or the preset fifth pressure threshold needs to be compared, wherein the preset fourth pressure threshold and the preset fifth pressure threshold are set according to an empirical value or a specific condition, preferably, in an embodiment of the present invention, the preset first pressure threshold is 6bar, and the preset second pressure threshold is 8 bar.
S403, if the minimum value of the first pressure value and the second pressure value is larger than the preset fourth pressure threshold, stopping the target air pump;
in the embodiment of the present invention, in the comparison process, if the minimum value of the first pressure value and the second pressure value is greater than the preset fourth pressure threshold, the target air pump stops working.
S404, if the minimum value of the first pressure value and the second pressure value is smaller than the preset fifth pressure threshold value, the target air pump starts to work.
In the embodiment of the present invention, in the comparison process, if the minimum value of the first pressure value and the second pressure value is smaller than the preset fifth pressure threshold, the target air pump starts to operate.
In the embodiment of the present invention, an example is given based on the control method of the air pump, and a control logic diagram of the example is shown in fig. 5, and it is assumed that under a normal condition, when the system pressure drops to 6.5bar, the pressure switch is turned on; when the system pressure rises to 8.5bar, the pressure switch is opened. The control logic for controlling the air pump based on the pressure switch is added with: when the pressure switch is in an off state, the minimum value of the pressure fed back by the pressure sensors on the front axle braking air storage cylinder and the rear axle braking air storage cylinder is less than 5.5bar, and the pressure values of the two pressure sensors are between 2bar and 11bar (the pressure value is 0 or infinity due to the elimination of the pressure sensor fault). At this time, it can be basically concluded that the pressure switch has failed normally off (the probability of simultaneous failure of two pressure sensors is much lower than the probability of failure of one pressure switch). The control of the air pump is converted into the control of the pressure value fed back by the pressure sensor by the pressure switch. Taking the smaller value of the pressure values fed back by the two pressure sensors for hysteresis processing: when the pressure value is less than 6bar, the air pump starts to work; when the pressure value is larger than 8bar, the air pump stops working. In the above process, preferably, the minimum pressure value fed back by the pressure sensors on the front axle braking air cylinder and the rear axle braking air cylinder is less than 5.5bar, the air pump starts to operate, and after the air pump starts to operate, the minimum pressure value fed back by the pressure sensors on the front axle braking air cylinder and the rear axle braking air cylinder may be greater than 5.5bar, at this time, the target air pump continuously operates for a preset time period, preferably, in an embodiment of the present invention, the preset time period is 120s, so as to ensure that the corresponding air cylinders can meet the requirement of air pressure.
In the embodiment of the invention, as shown in fig. 5, when the normally-off state of the pressure switch fails, the output value of the comparison between the minimum pressure fed back by the pressure sensors on the front axle brake air cylinder and the rear axle brake air cylinder and 5.5bar through the working state of the air pump pressure switch of the whole vehicle, and the output enable signal output after the judgment result of whether the pressure values of the two pressure sensors are between 2bar and 11bar are 1, the control of the air pump is converted from the pressure switch control to the pressure sensor control, when the normally-off state of the pressure switch does not fail, the output value of the comparison between the minimum pressure fed back by the pressure sensors on the front axle brake air cylinder and the rear axle brake air cylinder and 5.5bar through the working state of the air pump pressure switch of the whole vehicle and the output signal output after the judgment result of whether the pressure values of the two pressure sensors are between 2bar and 11bar are 0, the control of the air pump through the pressure switch can be realized.
Based on the control method of the new energy automobile air pump, in an embodiment of the present invention, a control system of the new energy automobile air pump is further provided, a structural block diagram of the control system is shown in fig. 6, and the control system includes:
a first control module 501, an obtaining module 502, a judging module 503 and a converting module 504.
Wherein the content of the first and second substances,
the first control module 501 is configured to control the target air pump according to a target pressure switch;
the obtaining module 502 is configured to obtain a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder;
the determining module 503 is configured to determine whether the normally-off state of the target pressure switch fails according to the first pressure value and the second pressure value;
the conversion module 504 is configured to, if yes, convert the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor.
The invention discloses a control system of a new energy automobile air pump, which comprises: controlling a target air pump according to a target pressure switch; and acquiring a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder, and when the normally-off state of the target pressure switch is judged to be invalid according to the first pressure value and the second pressure value, converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor. The control system avoids the problem that when only a sensor or a pressure switch is adopted for control, if the air pressure sensor or the pressure switch breaks down, the air pump does not work when the system is under-voltage, so that the braking operation of the vehicle and the safety of the vehicle are influenced.
In an embodiment of the present invention, the control system further includes: a second control module 505.
Wherein the content of the first and second substances,
and the second control module 505 is configured to, if not, continue to control the target air pump according to the target pressure switch.
In this embodiment of the present invention, the first control module 501 includes:
a first retrieving unit 506, a first comparing unit 507, a switching-on unit 508 and a switching-off unit 509.
Wherein the content of the first and second substances,
the first obtaining unit 506 is configured to obtain a system pressure value, where the system pressure value is a pressure value in the main air path;
the first comparing unit 507 is configured to compare the system pressure value with a preset first pressure threshold and/or a preset second pressure threshold;
the switch-on unit 508 is configured to switch on the target pressure switch when the system pressure value is smaller than the preset first pressure threshold;
the disconnecting unit 509 is configured to disconnect the target pressure switch when the system pressure value is greater than the preset second pressure threshold.
In this embodiment of the present invention, the determining module 503 includes:
a first judging unit 510, a second judging unit 511 and a disabling unit 512.
Wherein the content of the first and second substances,
the first judging unit 510, configured to judge whether the state of the target pressure switch is an off state;
the second determining unit 511 is configured to determine, if the minimum value of the first pressure value and the second pressure value is smaller than a preset third pressure threshold, and whether the first pressure value and the second pressure value belong to a preset pressure threshold interval;
the failure unit 512 is configured to determine that the normally-off state of the target switch fails if the target switch is in the normally-off state;
in this embodiment of the present invention, the conversion module 504 includes:
a second obtaining unit 513, a second comparing unit 514, a stopping unit 515 and a starting unit 516.
Wherein the content of the first and second substances,
the second obtaining unit 513 is configured to obtain a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder when receiving an instruction corresponding to a failure of the normally-off state of the target pressure switch;
the second comparing unit 514 is configured to compare a minimum value of the first pressure value and the second pressure value with a preset fourth pressure threshold and/or a preset fifth pressure threshold;
the stopping unit 515 is configured to stop the target air pump if a minimum value of the first pressure value and the second pressure value is greater than the preset fourth pressure threshold;
the starting unit 516 is configured to, if a minimum value of the first pressure value and the second pressure value is smaller than the preset fifth pressure threshold, start the target air pump to work.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The method and the system for controlling the air pump of the new energy automobile are described in detail, specific examples are applied in the method for explaining the principle and the implementation mode of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (4)
1. A control method of an air pump of a new energy automobile is characterized by being applied to the braking process of the new energy automobile, and comprising the following steps:
controlling a target air pump according to a target pressure switch;
acquiring a first pressure value of a front axle braking air cylinder and a second pressure value of a rear axle braking air cylinder;
judging whether the normally-off state of the target pressure switch fails or not according to the first pressure value and the second pressure value;
if yes, converting the control of the target air pump from the control of the target pressure switch to the control of a target pressure sensor;
if not, continuing to control the target air pump according to the target pressure switch;
wherein controlling the target air pump according to the target pressure switch comprises:
acquiring a system pressure value, wherein the system pressure value is a pressure value in a main air path;
comparing the system pressure value with a preset first pressure threshold value and/or a preset second pressure threshold value;
when the system pressure value is smaller than the preset first pressure threshold value, the target pressure switch is switched on;
when the system pressure value is larger than the preset second pressure threshold value, the target pressure switch is switched off;
wherein, according to the first pressure value and the second pressure value, judging whether the normally-off state of the target pressure switch is invalid or not comprises:
judging whether the state of the target pressure switch is an off state;
if so, judging whether the minimum value of the first pressure value and the second pressure value is smaller than a preset third pressure threshold value or not and whether the first pressure value and the second pressure value belong to a preset pressure threshold value interval or not;
and if so, judging that the normally-off state of the target pressure switch is invalid.
2. The method of claim 1, wherein converting control of the target air pump from the target pressure switch control to target pressure sensor control comprises:
when an instruction corresponding to the failure of the normally-off state of the target pressure switch is received, acquiring a first pressure value of a front axle braking air cylinder and a second pressure value of a rear axle braking air cylinder;
comparing the minimum value of the first pressure value and the second pressure value with a preset fourth pressure threshold value and/or a preset fifth pressure threshold value;
if the minimum value of the first pressure value and the second pressure value is larger than the preset fourth pressure threshold value, stopping the target air pump;
and if the minimum value of the first pressure value and the second pressure value is smaller than the preset fifth pressure threshold value, the target air pump starts to work.
3. The utility model provides a control system of new energy automobile air pump which characterized in that, uses in new energy automobile braking process, and this system includes:
the first control module is used for controlling the target air pump according to the target pressure switch;
the acquisition module is used for acquiring a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder;
the judging module is used for judging whether the normally-off state of the target pressure switch fails or not according to the first pressure value and the second pressure value;
the conversion module is used for converting the control of the target air pump from the control of the target pressure switch to the control of the target pressure sensor if the target air pump is controlled by the target pressure switch;
the second control module is used for continuing to control the target air pump according to the target pressure switch if the target air pump is not controlled;
wherein the first control module comprises:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring a system pressure value, and the system pressure value is a pressure value in a main air path;
the first comparison unit is used for comparing the system pressure value with a preset first pressure threshold value and/or a preset second pressure threshold value;
the switching-on unit is used for switching on the target pressure switch when the system pressure value is smaller than the preset first pressure threshold value;
the disconnection unit is used for disconnecting the target pressure switch when the system pressure value is larger than the preset second pressure threshold value;
wherein, the judging module comprises:
a first judgment unit configured to judge whether or not the state of the target pressure switch is an off state;
a second judging unit, configured to judge whether a minimum value of the first pressure value and the second pressure value is smaller than a preset third pressure threshold and whether the first pressure value and the second pressure value belong to a preset pressure threshold interval if yes;
and the failure unit is used for judging that the normally-off state of the target pressure switch fails if the target pressure switch is in the normally-off state.
4. The system of claim 3, wherein the conversion module comprises:
the second acquisition unit is used for acquiring a first pressure value of the front axle braking air cylinder and a second pressure value of the rear axle braking air cylinder when receiving an instruction corresponding to the failure of the normally-off state of the target pressure switch;
the second comparison unit is used for comparing the minimum value of the first pressure value and the second pressure value with a preset fourth pressure threshold value and/or a preset fifth pressure threshold value;
the stopping unit is used for stopping the target air pump if the minimum value of the first pressure value and the second pressure value is larger than the preset fourth pressure threshold value;
and the starting unit is used for starting the target air pump to work if the minimum value of the first pressure value and the second pressure value is smaller than the preset fifth pressure threshold value.
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| CN201811123763.XA CN109334648B (en) | 2018-09-26 | 2018-09-26 | Control method and system for air pump of new energy automobile |
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| CN201811123763.XA CN109334648B (en) | 2018-09-26 | 2018-09-26 | Control method and system for air pump of new energy automobile |
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| CN109334648B true CN109334648B (en) | 2021-01-19 |
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| DE102005036615A1 (en) * | 2004-08-06 | 2006-02-23 | Continental Teves Ag & Co. Ohg | Device for providing pressure for an actuating unit of a motor vehicle brake system and method for controlling the device |
| DE102004062029A1 (en) * | 2004-12-23 | 2006-07-13 | Robert Bosch Gmbh | Monitoring a multi-piston pump |
| CN103498787B (en) * | 2013-10-18 | 2016-05-11 | 南车株洲电力机车有限公司 | A kind of engineering maintenance vehicle main compressor control method and control device thereof |
| CN107120262B (en) * | 2017-05-11 | 2018-08-31 | 厦门金龙联合汽车工业有限公司 | A kind of electric compressor control strategy and method for diagnosing faults |
| CN108327698A (en) * | 2018-01-22 | 2018-07-27 | 内蒙古青杉汽车有限公司 | A kind of air pump system control method |
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