CN114572172A - Brake system pressure maintaining control method, recording medium and system - Google Patents
Brake system pressure maintaining control method, recording medium and system Download PDFInfo
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- CN114572172A CN114572172A CN202210151097.0A CN202210151097A CN114572172A CN 114572172 A CN114572172 A CN 114572172A CN 202210151097 A CN202210151097 A CN 202210151097A CN 114572172 A CN114572172 A CN 114572172A
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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
- 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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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention belongs to the technical field of numerical control, and particularly relates to a pressure maintaining control method for a braking system, which comprises the following steps of: setting the upper/lower pressure limit of the system and the times of allowing the pressure of the braking system to be higher than the upper pressure limit between two adjacent unloads of the air compressor, if the pressure of the braking system is higher than the upper pressure limit, stopping the operation of the air compressor if the pressure of the braking system does not reach the set times, otherwise, stopping the operation of the air compressor if the gas dryer is judged to be in an unloading state; and when the pressure of the braking system is reduced to the lower pressure limit, the air compressor is started again. The invention reduces hardware configuration, has better energy-saving effect and is suitable for popularization and use in the automobile brake system. The invention also provides a non-transient readable recording medium storing the program of the method and a system comprising the medium, wherein the program can be called by a processing circuit to execute the method.
Description
Technical Field
The invention belongs to the technical field of numerical control, and discloses a pressure maintaining control method for a brake system, a recording medium and a system which are stored with a program capable of executing the method.
Background
Because of the ubiquitous requirements for energy conservation and consumption reduction in the automobile industry, an electronic control air compressor (referred to as an electronic control air compressor for short) is increasingly applied to traditional internal combustion engine automobiles or new energy automobiles, the structural forms and braking systems of the electronic control air compressor are also diversified, and although the control modes of the electronic control air compressor are different, the final purpose is to control the operation of the electronic control air compressor by monitoring the upper limit value and the lower limit value of the air pressure of the braking system, start the air compressor when the pressure of the braking system is lower than the lower limit value, and stop the operation of the air compressor when the pressure of the braking system is higher than the upper limit value. For example, the authorization announcement number is CN 210212358U: in the patent document of the 'control protection device and air compressor system for pure electric drive automobile air compressor', the air compressor adopts an alternating current motor drive structure, and a pressure switch is additionally arranged at an unloading port of an air dryer and used for detecting a signal of dryer pressure unloading in the air compressor inflating process and transmitting the signal to a controller to be used as a stop instruction of the upper limit of the pressure of a brake system, so that the air compressor is controlled to stop inflating. For another example, the authorization notice number is CN 111907496B: the patent document of the pure electric truck air brake energy supply pipeline system and the control method thereof also records the pressure upper limit value of the brake system and the operation of the air compressor under the same strategy control. The method for detecting whether the pressure of the braking system rises and is unloaded by adding the pressure switch at the unloading port of the dryer or detecting whether the pressure of the braking system rises and is taken as a judgment basis for judging whether the pressure of the braking system reaches the upper limit value of the pressure is feasible, but hardware is added, so that the reliability is reduced, and meanwhile, the control strategy for controlling the air compressor to stop inflating by detecting the unloading pressure has the advantages that the upper limit value of the pressure of the braking system is the pressure value of the opening of the unloading valve, the pressure difference formed between the upper limit value and the lower limit value of the pressure is the maximum, the unloading times are more, high-pressure gas generated by scarce energy is discharged in vain, and therefore, the energy consumption is higher.
Disclosure of Invention
Aiming at the problems, the invention provides a pressure maintaining control method for a braking system, which comprises the following steps:
setting a lower pressure limit and an upper pressure limit of a brake system and the times of allowing the pressure of the brake system to be higher than the upper pressure limit between two adjacent unloads of an air compressor, wherein the upper pressure limit is higher than the rated working pressure of the brake system and lower than the unloading pressure of a gas dryer in the brake system;
p2, when the pressure of the braking system is higher than the upper pressure limit and reaches the set times, judging the unloading state of the gas dryer, stopping the operation of the air compressor when the gas dryer is in the unloading state, and starting the air compressor when the pressure of the braking system is reduced to the lower pressure limit;
and P3, when the pressure of the braking system is higher than the upper pressure limit and does not reach the set times, stopping the operation of the air compressor, and when the pressure of the braking system is reduced to the lower pressure limit, starting the air compressor.
The control method ensures that the pressure of the brake system is controlled between the upper pressure limit and the lower pressure limit in most of time in a loading and unloading period, reduces the pressure difference bandwidth and achieves the energy-saving effect.
Preferably, the step of determining the unloading state of the gas dryer comprises: and if no braking signal returns and the pressure of the braking system is measured to be reduced, judging that the gas dryer is in an unloading state.
The judging method does not need to install a set of pressure detecting instrument at the outlet of the unloading valve, reduces hardware and improves the reliability of the whole system.
Further, the method for measuring the pressure drop of the brake system comprises the following steps: defining a variable S comprising a plurality of variables1、S2、S3、S4、S5、S6… … Sn, setting the sampling frequency of the pressure signal, and continuously assigning the acquired current value of the brake system pressure sensor to S1', simultaneously with S1Value of' assigns to S1，S1Is assigned to S2，S2Is assigned to S3… …, up to Sn-1Is assigned to Sn(ii) a If S is1' less than array { S1,S2,S3…,SnThe average value of the measured brake system pressure drop.
The method has better real-time performance, reduces the time delay from the opening of the unloading valve to the shutdown of the air compressor, and saves energy.
Preferably, the array S is read when the pressure of the brake system begins to drop, as measured without a return brake signal1,S2,S3…,SnThe maximum value of the pressure is used as the unloading pressure of the brake system, and the value is fed back to the central processing unit to adjust the setting of the upper pressure limit.
The reason is that the unloading valve is a mechanical spring structure, the peak pressure of the air storage tank of the brake system (namely the unloading pressure of the unloading valve) is gradually reduced due to gradual attenuation of the spring elasticity in the use process, and the value of the upper pressure limit D' needs to be automatically set and adjusted according to the pressure peak value of the air storage tank, so that the upper pressure limit is follow-up, and the unloading valve can be more suitable for the actual working condition of the unloading valve.
Preferably, the set number of times is 1.
When the brake system works in an environment with high humidity and the dehumidifying effect of the dryer is good, the setting mode is simple, the air in the brake system can be dried by opening the unloading valve for many times, and the phenomena of cavitation, rusting and slipping are reduced.
Preferably, the frequency is set according to the water content in the air in the brake system measured by a thermometer and a hygrometer, and the frequency is set to be smaller as the water content is higher.
The setting mode is flexible, can be better matched with the environment, and has energy-saving and dehumidifying effects.
Another aspect of the present invention provides a non-transitory readable recording medium storing one or more programs including instructions that, when executed, cause a processing circuit to execute the method for pressure maintaining control of a brake system.
The present invention provides a brake system pressure maintaining control system, which includes a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, the program includes a plurality of instructions, and the processing circuit executes the program to perform the brake system pressure maintaining control method.
Drawings
FIG. 1 is a schematic diagram of the air circuit and control circuit of the brake system in the embodiment of the invention;
in the figure: 1-an electric control air compressor; 2-a dryer; 3-four protection valves; 4-a gas storage tank; 5-vehicle brake; 6-quick release valve; 7-a brake unit; 8-a pressure sensor; 9-a relay; 10-a temperature and humidity sensor; 11-a controller;
FIG. 2 is a schematic control flow chart of the first embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for detecting a pressure drop in a brake system in an embodiment of the present invention;
FIG. 4 is a pressure control schematic diagram for controlling the number of unloads in a second embodiment of the present invention;
fig. 5 is a control flow diagram in the second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any new work based on the embodiments of the present invention, are within the scope of protection of the present invention.
The air compressor applied to the braking system has various forms, is driven by a diesel engine, is also electric, can be hydraulically controlled, pneumatically controlled or electrically controlled, and does not influence the implementation of the invention, and the implementation details are explained by taking the electrically controlled air compressor as an example.
As shown in fig. 1, the braking system is composed of an electric control air compressor 1, a dryer 2, a four-protection valve 3, an air storage tank 4, a vehicle brake 5, a quick release valve 6, a braking unit 7, a pressure sensor 8, a relay 9, a temperature and humidity sensor (optional) 10, a controller 11, a pipeline and a circuit. The electric control air compressor 1 is in an electromagnetic clutch and crank piston structure, when a coil of the electromagnetic clutch is electrified, the clutch is closed to drive the crank piston to move for inflating, and when the coil is powered off, the clutch is disconnected from the air compressor and the air compressor is not inflated any more; the pressure sensor 8 can be arranged on the air storage tank 4 or other places capable of representing the pressure of the brake system; the temperature/humidity sensor 10 can acquire the ambient temperature/humidity; other components such as the dryer 2, the four-protection valve 3, the air storage tank 4, the vehicle brake 5, the quick release valve 6 and the brake unit 7 are not different from the traditional vehicle brake system.
The controller 11 is a vehicle controller or an engine controller, and can acquire a pressure value of the pressure sensor 8, a braking signal of the vehicle brake 5, and a temperature and humidity signal returned by the temperature and humidity sensor 10, and meanwhile, the controller 11 can control the on-off of the relay 9 according to the control strategy requirement, so as to control the operation or stop of the electric control air compressor 1.
Example 1
And (3) controlling the lower limit of the pressure of the braking system:
the control system is internally provided with a lower pressure limit A of the braking system, when the pressure value of the pressure sensor 8 is lower than the lower pressure limit A, the controller sends an instruction to control the relay 9 to be conducted, the clutch is closed after the coil of the electric control air compressor 1 is electrified, and the air compressor starts to pump air. At present, the lower pressure limit control strategy of all similar electric control air compressor systems basically adopts the mode, and therefore, the detailed description is not provided.
Brake system pressure upper limit control:
before the introduction of the brake system upper pressure limit control logic, a brief introduction of the unloader valve of the dryer 2 is required. The dryer 2 is internally provided with a mechanical unloading valve for protecting the pressure of a brake system to prevent the pressure of the brake system from being overhigh, the unloading valve is of a mechanical spring structure, when the pressure of the brake system rises to the opening pressure B of the unloading valve when an air compressor is inflated, the unloading valve is opened, the pressure in the dryer 2, the four protection valves 3, the air storage tank 4 and a pipeline in the brake system is reduced, when the pressure of the brake system is reduced to the pressure balance state of the unloading valve, the unloading valve is closed, namely when the unloading valve of the dryer 2 is unloaded, the pressure in the air storage tank 4 is unloaded simultaneously, and therefore the pressure sensor 8 can detect the unloading state of the unloading valve of the dryer 2. At present, the pressure upper limit control strategy of all similar electric control air compressor systems is to add a pressure switch or a pressure sensor at the position of an unloading valve of the dryer 2 to detect unloading pressure, so that the pressure upper limit control strategy is used as a judgment condition for controlling the electric control air compressor to stop working, and the control strategy increases the hardware cost of the control system.
In the embodiment, the brake system is continuously inflated until the unloading valve is opened and then stopped after the pressure of the brake system rises to the upper limit of the breakthrough pressure only once between two times of unloading, but the unloading state can be judged only by utilizing the pressure change of the air storage tank 4 detected by the pressure sensor 8, and the pressure switch or the pressure sensor is not added at the position of the unloading valve of the dryer 2 to detect the unloading pressure. The basic principle is as described above, when the unloading valve of the dryer 2 unloads, the pressure in the air storage tank 4 is also unloaded at the same time, and the unloading state of the dryer 2 can be logically judged according to the pressure change in the air storage tank 4, so that the electric control air compressor is controlled to stop working.
The specific control logic scheme is as follows: as shown in fig. 2: the control system is internally provided with a brake system pressure upper limit value C, and the pressure upper limit value C needs to be higher than the pressure value (refer to the attached figure 3) of all opened air storage tank valves when a plurality of air storage tanks are combined and lower than the unloading pressure B of an unloading valve of the dryer 2; when the pressure signal of the pressure sensor 8 is lower than the lower limit value A of the pressure of a built-in brake system of the control system, the electric control air compressor starts to pump air, the pressure of the air storage tank 4 starts to continuously rise, and when the pressure signal of the pressure sensor 8 is greater than or equal to the upper limit value C of the pressure, the controller 11 continuously reads the brake signal of the brake 5 of the whole vehicle and simultaneously continuously reads the pressure signal of the pressure sensor 8; when the pressure of the air storage tank 4 is reduced, a braking signal is simultaneously provided, the possibility of unloading of an unloading valve of the current braking system in the air removal dryer 2 can be judged, and the relay 9 is controlled to attract the electric control air compressor 1 to continue pumping air; when the pressure of the air storage tank 4 is reduced, no braking signal is generated at the same time, the unloading valve of the dryer 2 can be judged to be unloaded currently, and the control relay 9 is switched off to stop the air pumping of the electric control air compressor.
The logical operation method for judging the pressure drop of the air storage tank 4 comprises the following steps: as shown in FIG. 3, a variable S is defined which includes a plurality of variables1、S2、S3、S4、S5、S6… … Sn, setting the sampling frequency of the pressure signal, and continuously assigning the acquired current value of the brake system pressure sensor to S1', simultaneously with S1Value of' assigns to S1，S1Is assigned to S2，S2Is assigned to S3… …, up to Sn-1Is assigned to Sn(ii) a If S is1' less than array { S1,S2,S3…,SnThe average value of, i.e. the measured brake system pressure drop.
Example 2
The embodiment 2 is basically consistent with the whole process of the embodiment 1, and the difference is only that the pressure of the brake system is allowed to rise for multiple times to exceed the upper pressure limit between two times of unloading. Before the introduction of the brake system upper pressure limit control logic, the function of the unloader 2 unloading valve needs to be briefly described: when 2 unloading valves of desicator carry out pressure unloading, also can get rid of moisture or the oil stain in the desicator, no matter be traditional mechanical air compressor machine braking system or automatically controlled air compressor machine braking system control logic on the existing market, all can let the air compressor machine inflate the time all to open the unloading valve and carry out the blowdown all time, but when actual test monitoring desicator drain discharge, all have moisture or oil stain to discharge when not unloading each time, whether have moisture or oil stain to discharge depends on the adsorption efficiency of desicator and the influence of atmospheric environment humiture. Such dryer blowdown logic can lead to two problems: one problem is that the air storage tank 4 has a large pressure loss when the dryer 2 is unloaded, as shown in fig. 3, the air compressor performs air pumping to make the pressure in the air storage tank 4 reach an unloading pressure B, then a part of the pressure is unloaded to make the pressure in the air storage tank 4 maintain at D, the pressure loss between B and D can reach 50-80kpa, and the air compressor performs a large part of useless work and wastes energy. Another problem is that the larger the pressure drop between B and D is, i.e. the lower the stable pressure D in the air storage tank 4 is, the less the energy of the air source stored in the air storage tank 4 is, under the same air-using condition, the time for the pressure of the air storage tank to drop to the lower pressure limit value a will be faster if the stable pressure D value of the air storage tank is lower in the full air state, which will accelerate the time for the air compressor to intervene in the air inflation operation, and is not favorable for energy saving. If like in fig. 4, the time for the air compressor to intervene to inflate is delayed when the pressure in the air storage tank 4 is increased from D to D ', 4 braking air is needed when the pressure in the air storage tank is decreased from D' to the lower pressure limit a, but only 3 braking air is needed when the pressure in the air storage tank is decreased from D to the lower pressure limit a, and the air compressor needs to intervene to inflate (the 4 braking air and the 3 braking air shown in the figure are only logical relations for explaining the strategy, and the specific times are according to actual conditions). In summary, if the unloading valve is not opened for unloading when the dryer is not required to discharge sewage, a large amount of electric energy can be saved, and the unloading can be completed by setting the number of times that the pressure of the brake system is allowed to exceed the upper pressure limit between two times of unloading, the more times, the smaller the number of times of opening the unloading valve, the more energy-saving, the more the number of times of opening the unloading valve is, the more water in the system needs to be discharged after all, and therefore the setting of the parameters refers to the temperature and the humidity of the working environment of the system.
The specific workflow is shown in fig. 5:
a. the controller 11 continuously acquires the pressure value of the pressure sensor 8;
b. judging the current pressure in the air storage tank 4 according to the pressure value of the pressure sensor 8, and if the pressure value is higher than the upper pressure limit A, controlling the electric control air compressor 1 not to inflate (the air storage tank 4 is in the process from the full air state to the air use, namely the air compressor does not participate in air supplement) by the controller 11; if the pressure value is lower than the upper pressure limit A, the controller 11 controls the electric control air compressor 1 to start pumping air (namely, the air storage tank 4 needs to be supplemented to the full air state process);
c. along with the rise of the pressure value in the air storage tank 4, if the pressure value does not reach the upper pressure limit D', the controller 11 controls the electric control air compressor 1 to continue pumping air; if the pressure value reaches the upper pressure limit D ', the controller 11 records the times i that the pressure value reaches the upper pressure limit D ', accumulates the times i, compares the values of i and N, and if i is less than or equal to N, the controller 11 controls the electric control air compressor 1 to stop inflating to maintain the pressure in the air storage tank 4 as D '; if i is N +1, the controller 11 controls the electric control air compressor to continue inflating and monitors whether the whole vehicle system uses air or not, if the whole vehicle system does not use air, the unloading of the unloading valve of the dryer is judged through the reduction of the pressure value of the sensor, the electric control air compressor 1 is controlled to stop inflating, i is set to be 0, and the second round of circulation is carried out; if the whole vehicle is judged to be braked with gas, the pressure value of the sensor is eliminated from being reduced due to the opening of the unloading valve, and the electric control air compressor 1 is controlled to continue pumping gas.
d.N value is set in the control program of the controller 11, the value of N can be determined by the temperature and humidity signal of the temperature and humidity sensor 10, the temperature and humidity-atmosphere moisture content meter (see table 1, Mnn represents the moisture content in the air) is set in the control program of the controller 11, and the temperature and humidity value corresponds to the moisture content in the air. When the temperature and humidity signal indicates that the moisture content of the current air is high, the value N can be automatically set to a smaller number by the control program, for example, when N is 3, the controller 11 controls the dryer 2 to unload and discharge when the pressure in the air storage tank 4 reaches the upper pressure limit D' for the 4 th time. When the temperature and humidity signal indicates that the moisture content of the current air is low, the value N can be automatically set to a larger number by the control program, for example, when N is 6, the controller 11 controls the dryer 2 to unload and discharge when the pressure in the air storage tank 4 reaches the upper pressure limit D' for the 7 th time. Meanwhile, how to set the value of N also needs to consider the drying capacity of the dryer. The purpose of energy saving is achieved by controlling the opening times of the unloading valve of the dryer.
Table 1: temperature and humidity-water content corresponding table
e. The unloading valve is a mechanical spring structure, peak pressure of a brake system air storage tank (namely unloading pressure of the unloading valve) is gradually reduced due to gradual attenuation of spring force in the using process, the numerical value of an upper pressure limit D 'needs to be automatically set and adjusted according to the pressure peak value of the air storage tank, when unloading just occurs, the pressure peak value of the brake system air storage tank is determined by reading pressure values of arrays { S1, S2, S3 … and Sn }, and a certain safety threshold value, such as 10kpa, is given, namely the upper pressure limit D' is the pressure peak value-safety threshold value of the air storage tank.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computers, usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The technical scheme of the invention is that the method steps are compiled into a program and then the program is stored in a hard disk or other non-transient storage media to form the non-transient readable recording medium; the storage medium is electrically connected with a computer processor, and the start and stop of the air compressor of the braking system are controlled through data processing, so that the technical scheme of the 'pressure maintaining control system of the braking system' is formed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A pressure maintaining control method for a brake system is characterized by comprising the following steps:
setting a lower pressure limit and an upper pressure limit of a brake system and the times of allowing the pressure of the brake system to be higher than the upper pressure limit between two adjacent unloads of an air compressor, wherein the upper pressure limit is higher than the rated working pressure of the brake system and lower than the unloading pressure of a gas dryer in the brake system;
p2, when the pressure of the braking system is higher than the upper pressure limit and reaches the set times, judging the unloading state of the gas dryer, stopping the operation of the air compressor when the gas dryer is in the unloading state, and starting the air compressor when the pressure of the braking system is reduced to the lower pressure limit;
and P3, when the pressure of the braking system is higher than the upper pressure limit and does not reach the set times, stopping the operation of the air compressor, and when the pressure of the braking system is reduced to the lower pressure limit, starting the air compressor.
2. A brake system pressure maintaining control method according to claim 1, wherein the step of determining the unloading state of the gas dryer includes: and if no braking signal returns and the pressure of the braking system is measured to be reduced, judging that the gas dryer is in an unloading state.
3. A brake system hold pressure control method as claimed in claim 2, wherein said method of detecting a drop in brake system pressure includes the steps of: defining a variable S comprising a plurality of variables1、S2、S3、S4、S5、S6… … Sn, setting the sampling frequency of the pressure signal, and continuously assigning the current value of the acquired brake system pressure sensor to S1', simultaneously with S1Value of' assigns to S1，S1Is assigned to S2，S2Is assigned to S3… …, up to Sn-1Is assigned to Sn(ii) a If S is1' less than array { S1,S2,S3…,SnThe average value of the measured brake system pressure drop.
4. A brake system pressure holding control method according to claim 3, characterized in that: reading the array S when the pressure of the brake system begins to drop under the condition of not returning the brake signal1,S2,S3…,SnThe maximum value of the pressure is used as the unloading pressure of the brake system, and the value is fed back to the central processing unit to adjust the setting of the upper pressure limit.
5. A brake system pressure maintaining control method according to claim 3, wherein the set number of times is 1.
6. A brake system pressure holding control method according to claim 3, wherein the number of times is set based on a water content in air in the brake system measured by a thermometer and a hygrometer, and the number of times is set to be smaller as the water content is higher.
7. A non-transitory readable recording medium storing one or more programs comprising instructions which, when executed, cause a processing circuit to perform a brake system hold pressure control method of any one of claims 1-6.
8. A brake system pressure holding control system comprising processing circuitry and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, the program comprising a plurality of instructions, and the processing circuitry is configured to execute the program to perform a brake system pressure holding control method according to claim 6.
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