Blade electric vehicle blast pump control system and control method

Abstract

The invention relates to the technical field of electric vehicle blast pump control, in particular to a battery electric vehicle blast pump control system and a battery electric vehicle blast pump control method. Meanwhile, whether the brake pipeline leaks air or not is detected to accurately control starting and stopping of the inflation pump, and the problems that in the prior art, the inflation pump cannot be accurately controlled to be closed only through an air pressure value and an unloading pressure switch, battery electricity loss is caused, and the service life of the inflation pump and driving safety are affected are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle air pump control, and in particular to a pure electric vehicle air pump control system and control method. Background Art

[0002] As the environmental protection and energy situation becomes increasingly severe, the country is actively promoting carbon peak and carbon neutrality, and the market share of new energy commercial vehicles has increased rapidly. The braking systems of most new energy commercial vehicles are dual-circuit pneumatic brakes, and electric air pumps are used in the braking systems; the electric air pump is mainly controlled by the vehicle controller sending an enable signal. In the existing technology, the vehicle controller controls the start and stop of the air pump by collecting the dryer unloading pressure switch signal; at the same time, combined with the reading of the air pressure values ​​of the front and rear air cylinders, the start and stop pressure values ​​are set to control the start and stop of the air pump.

[0003] At present, the existing technologies for controlling the air pump individually or in combination have the following limitations: when the dryer pressure switch signal has a large pressure deviation or fails after long-term use, and the air pressure value signal wave collected by the instrument is large and the accuracy is not high, the air pump cannot be accurately controlled, resulting in energy waste and even driving safety risks; at the same time, it is not considered that if there is a leak in the brake air circuit, the air pump will continue to work without a protection strategy, resulting in energy waste and easy damage to the air pump.

[0004] CN104595167A discloses a method for controlling an air pump of a pure electric vehicle. This method only uses the dryer air pressure switch to determine when the air pump is stopped. When the dryer pressure switch has a large pressure deviation or fails after long-term use, the air pump cannot be accurately controlled to stop, causing the air pump to overload.

[0005] CN212289789U discloses a vehicle-mounted air pump system and a vehicle-mounted air pump operation control method. When controlling the start and stop of the air pump, this method makes judgments based on the dryer air pressure switch, the air pump temperature switch and the air pressure value. The air pump only relies on the pressure value and the unloading pressure switch to control the start and stop, which is inaccurate, affects the service life of the air pump, and causes energy waste.

[0006] Therefore, the present invention aims to solve the problem in the prior art that once there is an air leak in the brake air circuit, the air pump will keep working without a protection strategy, resulting in energy waste and easy damage to the air pump. When the dryer pressure switch signal has been used for a long time, the pressure deviation is large or fails. At the same time, the air pressure value signal wave collected by the instrument is large and the accuracy is not high, and the air pump cannot be controlled to stop in time. The present invention collects the front and rear air tank air pressure values ​​sent by the instrument and the effective bus current value sent by the air pump controller through the vehicle controller, determines that the exhaust flag is valid, and sends the air pump shutdown enable. Summary of the Invention

[0007] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

[0008] In view of the above existing problems, the present invention is proposed.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: including a vehicle controller, a high-voltage distribution box, an air pump controller, an air pump, a dryer, an air reservoir, an air pressure sensor and an instrument, the vehicle controller is respectively connected to the instrument and the air pump controller through a CAN network, and is connected to the unloading pressure switch inside the dryer through a signal line, the high-voltage distribution box is connected to the air pump controller through a high-voltage line, the air pump controller is connected to the air pump through a high-voltage three-phase line, the air pump is connected to the dryer through a brake line, the air reservoir is connected to the air pressure sensor through a brake line, and the air pressure sensor is connected to the instrument through a signal line;

[0010] Among them, the vehicle controller is used to receive various air pressure values ​​in real time and monitor the vehicle status. When the air pressure value is less than the set inflation pressure threshold and the vehicle status is met, a work enable instruction is sent to the air pump controller, and the high-voltage distribution box is the high-voltage power distribution control element of the vehicle, which is used to provide high-voltage direct current to the air pump controller. The air pump controller responds to the control instructions of the vehicle controller to the air pump, controls the start and stop of the air pump, and detects the working status of the air pump in real time, and uploads the bus current and fault code working status of the air pump to the CAN bus.

[0011] As a preferred solution of the pure electric vehicle air pump control system described in the present invention, the dryer is used to reduce the water content in the brake air circuit. The dryer includes an unloading pressure switch. When it is detected that the dryer air pressure reaches the set pressure threshold, the unloading and exhaust action is performed and the unloading switch signal is sent to the vehicle controller.

[0012] As a preferred solution of the pure electric vehicle air pump control system described in the present invention, the instrument is used to collect the voltage signal of the air pressure sensor, display the air pressure value of the air tank, and send it to the vehicle controller in real time through the CAN bus.

[0013] As a preferred solution of the pure electric vehicle air pump control system described in the present invention, the instrument also displays brake system fault information issued by the vehicle controller and the air pump controller.

[0014] As a preferred solution of the pure electric vehicle air pump control system described in the present invention, the vehicle controller is also used to receive various air pressure values ​​and dryer unloading pressure switch signals in real time. When the air pressure value is greater than the set stop airing pressure threshold or the unloading pressure switch signal is valid, a work stop instruction is sent to the air pump controller.

[0015] As a preferred solution of the pure electric vehicle air pump control system described in the present invention, the vehicle controller is also used to receive the air pump bus current value in real time. If the decrease value of the bus current value within 8 seconds is greater than the set value, and the front and rear air pressure values ​​are both greater than the set threshold, a work stop command is sent to the air pump controller.

[0016] As a preferred solution of the pure electric vehicle air pump control system described in the present invention, the vehicle controller is also used to calculate the continuous running time of the air pump. When the continuous running time reaches a set value, the brake air circuit leaks, and a work stop instruction is sent to the air pump controller. At the same time, a leakage alarm is sent to the instrument. After that, two brake signals are detected, and the operation is restored to the set time value, and this cycle is repeated.

[0017] As a preferred solution of the pure electric vehicle air pump control system described in the present invention, there are multiple air storage cylinders.

[0018] As a preferred solution of the pure electric vehicle air pump control method of the present invention, the control method includes the following steps:

[0019] S1. The vehicle controller collects vehicle status information through the CAN line and determines whether the following conditions are met:

[0020] The vehicle's power supply is valid in ON position and lasts for 3 seconds;

[0021] The high-voltage relay of the air pump controller is closed or stuck;

[0022] Front storage air pressure ≤ 0.7Mpa, lasting 0.5S;

[0023] When all the above judgment conditions are met at the same time, the vehicle controller sends an air pump operation enable signal;

[0024] S2, the vehicle controller sends an air pump operation enable signal, and the air pump controller receives the operation signal and controls the air pump operation;

[0025] S3, the vehicle controller collects vehicle status information, and when it determines that the parking power-off flag is valid, sends the air pump shutdown enable signal;

[0026] S4. The vehicle controller determines that the dryer exhaust flag is valid by collecting the front and rear air tank pressure values ​​sent by the instrument and the bus current value sent by the air pump controller, delays for 3 seconds, and sends the air pump shutdown enable signal;

[0027] S5. The vehicle controller collects the air pressure values ​​of the front and rear air reservoirs sent by the instrument. When the air pressure values ​​are both greater than 0.95 MPa, it delays 30 seconds and sends a signal to stop the air pump.

[0028] S6. The vehicle controller collects the air pressure values ​​of the front and rear air reservoirs sent by the instrument. When the air pressures are both greater than 0.85 MPa and the dryer unloading pressure switch is valid, it sends an air pump shutdown enable signal.

[0029] S7. The vehicle controller calculates the running time of the air pump in real time. When the air pump works normally for 15 minutes and the air pressure value has not reached the set value, the brake air circuit is leaking, the air pump shutdown enable is sent, and a leakage fault prompt is sent to the instrument display. After detecting two brake signals, the operation is resumed for 15 minutes, and this cycle is repeated.

[0030] Beneficial effects of the present invention: The present invention accurately controls the start and stop of the air pump by detecting the air pressure value of the air cylinder, detecting the dryer unloading pressure switch signal, detecting the change in the bus current value of the air pump controller when the dryer is exhausted, and detecting whether the brake line is leaking. This effectively solves the problem in the prior art that only relying on the air pressure value and the unloading pressure switch cannot accurately control the shutdown of the air pump, causing battery power loss, affecting the life of the air pump and driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0032] Figure 1 This is a structural diagram of the air pump control system for a pure electric vehicle shown in the present invention;

[0033] Figure 2 This is a flow chart of a method for controlling an air pump for a pure electric vehicle according to the present invention. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0035] Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without making any creative work should fall within the scope of protection of the present invention.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] According to an embodiment of the present invention, Figure 1 The system structure diagram shown is a pure electric vehicle air pump control system, which includes a vehicle controller 1, a high-voltage distribution box 2, an air pump controller 3, an air pump 4, a dryer 5, an air tank 6, an air pressure sensor 7 and an instrument 8.

[0038] Specifically, the vehicle controller 1 is connected to the instrument 8 and the air pump controller 3 through the CAN network, and is connected to the unloading pressure switch inside the dryer 5 through a signal line. The high-voltage distribution box 2 is connected to the air pump controller 3 through a high-voltage line. The air pump controller 3 is connected to the air pump 4 through a high-voltage three-phase line. The air pump 4 is connected to the dryer 5 through a brake line. The air reservoir 6 is connected to the air pressure sensor 7 through the brake line. The air pressure sensor 7 is connected to the instrument 8 through a signal line.

[0039] Among them, the vehicle controller 1 is used to receive various air pressure values ​​in real time and monitor the vehicle status. When the air pressure value is less than the set inflation pressure threshold and the vehicle status is met, a work enable instruction is sent to the air pump controller 3, and the high-voltage distribution box 2 is the high-voltage power distribution control element of the vehicle, which is used to provide high-voltage direct current to the air pump controller 3. The air pump controller 3 responds to the control instructions of the vehicle controller 1 to the air pump 4, controls the start and stop of the air pump 4, and detects the working status of the air pump 4 in real time, and uploads the bus current and fault code working status of the air pump 4 to the CAN bus.

[0040] As an example, there are multiple gas cylinders 6 .

[0041] Furthermore, the dryer 5 is used to reduce the water content in the brake air circuit. The dryer 5 includes an unloading pressure switch. When it is detected that the dryer air pressure reaches the set pressure threshold, the unloading and exhaust action is performed and an unloading switch signal is sent to the vehicle controller 1.

[0042] Furthermore, the instrument 8 is used to collect the voltage signal of the air pressure sensor 7, display the air pressure value of the air cylinder 6, and send it to the vehicle controller 1 in real time through the CAN bus; at the same time, the instrument 8 also displays the brake system fault information issued by the vehicle controller 1 and the air pump controller 3.

[0043] In an optional embodiment, the vehicle controller 1 is also used to receive the air pressure values ​​of each line and the dryer unloading pressure switch signal in real time. When the air pressure value is greater than the set stop inflation pressure threshold or the unloading pressure switch signal is valid, a work stop instruction is sent to the air pump controller 3.

[0044] In an optional embodiment, the vehicle controller 1 is also used to receive the bus current value of the air pump in real time. If the decrease in the bus current value within 8 seconds is greater than the set value, and the front and rear air pressure values ​​are both greater than the set threshold, a work stop command is sent to the air pump controller 3.

[0045] In an optional embodiment, the vehicle controller 1 is also used to calculate the continuous running time of the air pump 4. When the continuous running time reaches a set value, the brake air circuit leaks, and a work stop command is sent to the air pump controller 3. At the same time, a leakage alarm is sent to the instrument 8. After that, two brake signals are detected, and the operation is restored to the set time value, and this cycle is repeated.

[0046] It should be noted that this embodiment provides a pure electric vehicle air pump control system, in which the vehicle controller builds a three-level conditional composite evaluation system based on the CAN bus, including: a basic startup evaluation layer, an enhanced control evaluation layer, and a safety protection evaluation layer. Each evaluation layer corresponds to a different level of control measures, and the state evaluation is performed cyclically to provide a dynamic, accurate, and safe air pressure management solution:

[0047] (1) Basic startup assessment layer

[0048] The basic startup assessment layer is determined by the intersection of the following multiple conditions:

[0049] The vehicle's ON power is valid (lasts at least 3 seconds);

[0050] The high-voltage relay of the air pump controller is in normal condition (closed or stuck);

[0051] The front air storage pressure is continuously lower than 0.7 MPa for more than 0.5 seconds;

[0052] When and only when the intersection of the above conditions is fully satisfied, the vehicle controller 1 automatically sends a start command to activate the air pump 4, ensuring that it is started only under necessary conditions, thereby reducing equipment wear and power waste.

[0053] (2) Enhanced control assessment layer

[0054] After the air pump 4 is started in the basic start-up assessment layer, the enhanced control assessment layer is started to perform real-time intersection monitoring and hierarchical judgment on the following conditions:

[0055] First layer conditions:

[0056] The real-time monitoring of the air pressure in the front and rear air reservoirs 6 is greater than 0.85Mpa;

[0057] The unloading pressure switch of dryer 5 is effective;

[0058] Second tier conditions:

[0059] The real-time monitoring of the air pressure in the front and rear air reservoirs 6 is greater than 0.95 MPa (delay of 30 seconds to confirm stability);

[0060] Third tier conditions:

[0061] The busbar current of air pump 4 drops by more than 40% within 8 seconds, and the front and rear gas storage pressures both reach above 0.85 MPa;

[0062] The above conditions are executed in layers one by one, and the system will stop when any condition level is met. Through this hierarchical condition evaluation mechanism, the stop conditions can be finely controlled to avoid the risks of over-pressurization or under-pressure, and significantly improve the system pressure stability and energy efficiency.

[0063] (3) Security protection assessment layer

[0064] After each basic startup layer is triggered, the vehicle controller 1 monitors the cumulative operating time of the air pump 4 in real time. If the air pressure fails to reach the set target after continuous operation for 15 minutes, it is determined that there is a leak in the brake air circuit and the following measures are taken:

[0065] Issue an air pump shutdown command to avoid equipment damage;

[0066] Send a gas leakage alarm to instrument 8, display the fault, and remind maintenance personnel;

[0067] Set the closed loop cycle: In this state, monitor the vehicle's braking signal. After detecting two braking signals, allow the air pump 4 to resume operation for 15 minutes and then re-evaluate the air circuit sealing status.

[0068] If the fault is not eliminated, the above process will be repeated in a closed-loop manner until the leakage fault is eliminated or manual intervention is required.

[0069] Through periodic state reassessment and closed-loop control, the possibility of the fault leakage point expanding is effectively avoided, protecting the safety of the braking system.

[0070] Furthermore, the above three evaluation layers are sequentially and cyclically executed:

[0071] Under normal circumstances, after each basic layer startup assessment is qualified, it enters the enhanced control assessment layer;

[0072] After the enhanced control assessment layer monitors and meets any of the conditions, it will automatically return to the basic assessment layer;

[0073] If the safety protection assessment layer triggers the air leakage fault detection closed loop, the cycle will continue until the fault is eliminated;

[0074] After the fault is eliminated, the status is automatically reset and the basic evaluation layer is restarted.

[0075] It should be noted that the CAN network is a real-time communication protocol widely used within vehicle systems. The present invention uses the CAN network to transmit various air pressure data and control instructions, which can ensure the real-time and reliability of data transmission, thereby improving the decision-making response speed of the vehicle controller 1.

[0076] It is not difficult to understand that the bus current refers to the current signal measured when the air pump 4 motor is running. The exhaust state of the dryer 5 is judged by monitoring the bus current change (decreasing value within 8s), and the exhaust process is identified based on the current attenuation characteristics.

[0077] It should also be noted that the present invention uses the vehicle controller 1 to accurately determine the exhaust status of the dryer 5 (i.e., whether the bus current decreases by more than 40% within 8 seconds) in real time based on changes in the bus current value and the pressure change in the air reservoir 6. Conventional dryer unloading and exhaust generally relies solely on a mechanical pressure switch as a trigger. The present invention, however, incorporates the electrical characteristic of the bus current to achieve more precise control, significantly improving the accuracy of identifying the drying and exhaust process, thereby completely eliminating moisture and impurities in the brake air circuit.

[0078] For example, traditional mechanical switches detecting air pressure thresholds may misjudge due to pressure fluctuations. The present invention uses current change trends to compensate for the shortcomings of mechanical pressure detection, effectively avoiding equipment wear and tear caused by frequent starts and stops, significantly extending equipment life, and reducing maintenance costs.

[0079] Preferably, the present invention calculates the operating duration of the air pump 4 in real time through the vehicle controller 1 to determine the air leakage state of the air circuit, and then combines the driver's two brake signals as the conditions for resuming operation to form a closed-loop self-healing strategy, making fault judgment more rigorous and reliable. This method of triggering self-healing control logic based on driving behavior signals effectively avoids the energy waste that may be caused by relying solely on timed restart, and solves the problem of difficulty in locating and repairing air circuit faults in traditional solutions.

[0080] According to an embodiment of the present invention, Figure 2 The flowchart shown is a method for controlling an air pump of a pure electric vehicle, which specifically includes the following steps:

[0081] S1, vehicle controller 1 collects vehicle status information message information through the CAN line and determines whether the following conditions are met:

[0082] (1) The vehicle's ON gear power signal is valid and lasts for 3 seconds;

[0083] (2) The high-voltage relay status signal of the air pump controller 3 is closed or stuck;

[0084] (3) The front storage air pressure is ≤ 0.7 MPa and lasts for 0.5 seconds;

[0085] When all the above judgment conditions are met at the same time, the vehicle controller 1 sends the air pump operation enable signal;

[0086] S2: The vehicle controller 1 sends an air pump operation enable signal, and the air pump controller 3 receives the operation signal and controls the air pump 4 to operate;

[0087] S3: The vehicle controller 1 collects the following message signals from the vehicle and sends the air pump shutdown enable signal when it determines that the parking and power-off flag is valid;

[0088] Among them, the parking and power-off signs:

[0089] (1) The high voltage signal is valid under battery request;

[0090] (2) The emergency stop switch signal is valid;

[0091] (3) The vehicle's ON gear power signal is invalid;

[0092] (4) The charging gun signal is valid;

[0093] (5) The absolute value of the motor speed is less than 300 rpm;

[0094] S4: The vehicle controller 1 determines that the dryer exhaust flag is valid by collecting the front and rear air reservoir pressure values ​​sent by the instrument 8 and the bus current value sent by the air pump controller 3. After a delay of 3 seconds, it sends the air pump shutdown enable signal. The 3-second delay in stopping the enable signal is to allow the dryer 5 to continue exhausting, emptying the moisture inside the brake pipe, reducing the moisture content in the brake air circuit, and ensuring braking safety.

[0095] Among them, the dryer exhaust mark:

[0096] (1) The front air storage pressure is greater than 0.85 MPa, and the rear air storage pressure is greater than 0.85 MPa;

[0097] (2) The busbar input current value of the air pump motor decreases by more than 40% within 8 seconds;

[0098] S5. The vehicle controller 1 collects the air pressure values ​​of the front and rear air tanks sent by the instrument 8. When the air pressure values ​​are both greater than 0.95 MPa, it delays 30 seconds and sends the air pump shutdown enable signal.

[0099] S6, vehicle control, 1 collects the air pressure values ​​of the front and rear air reservoirs sent by instrument 8. When the air pressure is greater than 0.85 MPa and the dryer unloading pressure switch is valid, the air pump shutdown enable is sent;

[0100] S7. The vehicle controller 1 calculates the running time of the air pump 4 in real time. When the air pump 4 works normally for 15 minutes and the air pressure value still does not reach the set value, it is determined that the brake air circuit is leaking, the air pump is shut down and enabled, and a leakage fault prompt is sent to the instrument 8 for display. However, for safety reasons, after two brake signals are detected, the operation is resumed for 15 minutes, and this cycle is repeated until the fault is rectified.

[0101] In a preferred embodiment, the vehicle controller 1 sends an air pump operation enable signal, and the air pump controller 3 receives the operation instruction to control the operation of the air pump 4, wherein the vehicle controller 1 inverts the high-voltage direct current of the battery into three-phase alternating current (such as 380V AC) through the IGBT module to control the operation of the air pump 4.

[0102] As an example, the vehicle controller 1 collects vehicle status information message information through the CAN line, which at least includes the vehicle ON gear power signal, the air pump controller high-voltage relay status signal and the front and rear air storage pressure signals.

[0103] As an example, the parking power-off flag is determined to be valid when the driver stops the vehicle, or the vehicle has other power-off requests (such as a battery failure or the vehicle is plugged in for charging), and the high-voltage process is promptly stopped and the air pump is turned off.

[0104] As an example, the dryer unloading pressure is a hard-line high-level signal. When the vehicle controller 1 collects the high-level signal and it is valid, it is determined that the dryer unloading pressure switch is valid.

[0105] As an example, when the vehicle controller 1 sends an air pump working instruction, timing starts and the continuous running time of the air pump 4 is recorded.

[0106] It is not difficult to understand that the vehicle controller 1 collects vehicle status information through the CAN line and performs logical judgment. The air pump 4 is allowed to start only when the vehicle's ON power supply is continuously valid, the relay status is normal, and the air storage pressure is lower than the set value, so that the air pump 4 starts working when the vehicle really needs to replenish air pressure, thereby effectively reducing unnecessary operation of the air pump 4, saving vehicle electricity and extending the service life of the air pump 4.

[0107] It should be noted that the vehicle controller 1 sends a working instruction to the air pump controller 3, so that the air pump 4 starts running in a timely and accurate manner, achieves rapid pressurization, ensures the timely recovery of the braking system pressure, improves the vehicle's braking safety performance, and ensures driving safety and reliability.

[0108] The vehicle controller 1 immediately sends an air pump shutdown command after recognizing that the parking and power-off flag is valid, effectively avoiding excessive battery discharge and equipment loss caused by the continuous operation of the air pump 4 after the vehicle is powered off, improving the energy utilization efficiency of the system, and extending the overall service life of the power battery and the air pump 4.

[0109] Furthermore, the vehicle controller 1 comprehensively judges the air pressure of the air tank and the bus current value to identify the exhaust status of the dryer 5, and delays stopping the air pump for 3 seconds after the exhaust is completed, which can ensure that the compressed air is dried to achieve the best effect, while preventing premature shutdown resulting in incomplete drying effect, which helps to improve the quality of compressed air and reduce performance degradation and failure of subsequent braking systems caused by moisture.

[0110] Furthermore, the vehicle controller 1 stops the machine with a delay of 30 seconds when the air pressure in the front and rear air tanks exceeds 0.95 MPa, ensuring that the air pump stops working only after the air pressure in the air tank 6 is fully stabilized, avoiding frequent starts and stops caused by excessive pressure fluctuations, stabilizing the pressure of the air storage system, reducing the wear and energy consumption caused by frequent movement of mechanical components, and extending the reliable operation cycle of the equipment.

[0111] The system shuts down when the air pressure in the air cylinder 6 is greater than 0.85 MPa and the unloading pressure switch of the dryer 5 is effective, thereby achieving a reasonable shutdown of the air pump 4 in a safety redundant state slightly below the limit pressure, effectively avoiding system risks caused by excessive air pressure, and ensuring the safety margin of the vehicle's braking system pressure, thereby improving the safety of system operation.

[0112] It should also be noted that the vehicle controller 1 monitors the working time of the air pump 4 in real time. When the air pump 4 has been working continuously for 15 minutes and has not completed the pressurization, it is determined that there is a brake air circuit leakage, and the machine is shut down in time and an air leakage fault alarm is issued to avoid serious damage to the equipment caused by long-term overload operation, effectively protect the safety of system components, and prevent the continuous expansion of safety hazards. At the same time, it will restart periodically after receiving the brake signal to ensure the temporary braking needs of the vehicle, thereby improving the safety guarantee capability of the entire vehicle operation.

[0113] Preferably, the present embodiment provides a pure electric vehicle air pump control method, which ensures that the start and stop actions of the air pump 4 are accurate and reasonable through intelligent judgment and multi-condition linkage control of the vehicle controller, avoids frequent and ineffective start and stop of the air pump and long-term abnormal operation, and significantly improves energy utilization efficiency and equipment life.

[0114] Preferably, the method of the present invention monitors the status of the air circuit system in real time, promptly discovers and warns of air leakage faults, and actively prevents the spread of faults, thereby effectively ensuring the stability and reliability of the safety performance of the vehicle braking system and providing a comprehensive, efficient and safe air pressure protection solution for the operation of the entire vehicle.

[0115] The following describes in more detail the implementation process and / or effects of certain embodiments of the present invention in conjunction with some preferred or optional examples of the present invention.

[0116] In a preferred embodiment, the vehicle controller 1 collects the following data in real time periodically (e.g., 10 ms) via the CAN bus:

[0117] Vehicle ON gear power signal S on , 1 means high level is valid;

[0118] High voltage relay status signal S relay , 1 means closed or adhered;

[0119] Front air reservoir pressure signal P f ;

[0120] For example, the mathematical expression for the above determination is:

[0121] T on ≥3s,S on =1

[0122] S relay =1

[0123] P f ≤0.7Mpa, and duration Δt≥0.5s

[0124] Among them, T on is the cumulative time that the vehicle's ON gear power signal is continuously valid, and Δt is the duration window for determining the front storage air pressure;

[0125] When the intersection of the above conditions is met, the vehicle controller 1 outputs a start enable command;

[0126] The thresholds are set based on ensuring the vehicle is actually started, the relay is conducting normally, and the air pressure is indeed insufficient rather than misjudged. This prevents the pump from frequently starting by mistake, saves battery energy, and extends the life of the pump.

[0127] Furthermore, the vehicle controller 1 sends an enable signal, and the air pump controller 3 uses an IGBT module (such as Infineon FP25R12) to invert the vehicle DC bus voltage (such as DC600V) into three-phase AC power (such as 380V AC) to drive the air pump 4;

[0128] At the same time, a Hall sensor (such as LEM HAS-100) is used to measure the bus current I of the air pump 4 motor in real time, and upload it to the CAN bus in a 100ms cycle to provide electrical characteristics for subsequent accurate determination of the dryer exhaust status;

[0129] In a preferred embodiment, the method for real-time monitoring and rapid identification of parking and power-off signs is:

[0130] Battery request high voltage signal (S battdown =1);

[0131] Emergency stop switch signal (S stop =1);

[0132] The vehicle ON gear power signal is invalid (S on =0);

[0133] Charging gun signal (S charger =1);

[0134] The absolute value of the motor speed |n| is calculated in real time to satisfy |n|<300rpm;

[0135] It should be noted that as long as any of the signs are met, a shutdown command is sent. This multiple cross-redundant judgment method ensures that the vehicle can be shut down quickly and accurately when parking or an abnormality occurs, protecting battery safety and vehicle electrical system stability.

[0136] The vehicle controller 1 also monitors the air pressure of the air tank (P f 、P r ) and bus current I changing trend:

[0137] The air pressure judgment threshold is: front storage air pressure P f and rear storage pressure P r At the same time> 0.85Mpa;

[0138] The current change trend is defined by the current reduction ratio ΔI / I0 within 8 seconds:

[0139]

[0140] Among them, I0 is the initial value of current, I t is the real-time current value after 8 seconds, and ΔI is the bus current attenuation within 8 seconds;

[0141] when When , it is determined that the exhaust state of the dryer is valid;

[0142] After the dryer is identified to be exhausted, the machine will be shut down after a delay of τ=3 seconds to allow the internal moisture to be completely exhausted, eliminating the disadvantage of traditional technology that may cause braking hazards due to incomplete dryer exhaust.

[0143] In a preferred embodiment, the gas reservoir pressure threshold is set to a high safety standard value of 0.95 MPa. f >0.95Mpa,P r >0.95Mpa, continuous stability time T stable When the time is ≥30s, the vehicle controller 1 sends a shutdown enable command. This delay judgment mechanism ensures that the brake air pressure reaches a steady state, avoiding mechanical component wear and energy waste caused by frequent starting and stopping;

[0144] Exemplarily, the air pressure threshold is determined as follows:

[0145] P f >0.85Mpa,P r >0.85Mpa

[0146] Unloading pressure switch is hard line high level signal (S unload =1);

[0147] When the above conditions are met at the same time, shut down immediately;

[0148] This fast cross judgment rule can quickly respond to the unloading state, avoid the risk of system pressure overload, and effectively improve the braking safety redundancy level;

[0149] In a preferred embodiment, the leakage determination rule is:

[0150] Define the cumulative running time T run ;

[0151] Set the maximum operating threshold T max 15 minutes;

[0152] If T run ≥T max =15min, and (P f or P r ) <P target ;

[0153] The vehicle controller 1 immediately sends a gas leakage alarm to the instrument 8 for display and shuts down the machine to prevent the equipment from overloading.

[0154] At the same time, monitor the brake signal S brake , when the cumulative number of braking times N brake = 2, the pump is allowed to resume operation for 15 minutes (T max ) and then make judgments to form a closed-loop adaptive mechanism.

[0155] It should be noted that the above method achieves precise and reliable brake pressure management through multi-condition real-time cross-monitoring, precise delay control, bus current change feature recognition, and driving behavior-triggered leakage self-healing mechanism, significantly improving the operating safety and energy efficiency management level of pure electric vehicles.

[0156] In the application of the above embodiments, an embodiment of the present invention discloses a pure electric vehicle air pump control system, which further includes one or more processors and memories.

[0157] The memory is used to store operable instructions, which, when executed by the one or more processors, cause the one or more processors to perform operations, including the process of the pure electric vehicle air pump control method of the aforementioned embodiment, especially Figure 2 The process of the method shown.

[0158] Furthermore, the embodiment of the present invention discloses a pure electric vehicle air pump control system, which also includes a computer-readable medium storing software, wherein the software includes instructions that can be executed by one or more computers, and the execution of these instructions causes one or more computers to perform operations, including the process of the pure electric vehicle air pump control method of the aforementioned embodiment, especially Figure 2 The process of the method shown.

[0159] It should be appreciated that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable memory.

[0160] The method may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes a computer to operate in a specific and predefined manner.

[0161] Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with a computer system, however, the program can be implemented in assembly or machine language if desired.

[0162] In any case, the language may be a compiled or interpreted language.

[0163] Furthermore, the program can be run on an application specific integrated circuit programmed for this purpose.

[0164] The processes described herein (or variations and / or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) that collectively executes on one or more processors, by hardware, or a combination thereof. The computer program includes a plurality of instructions that can be executed by one or more processors.

[0165] Further, the method may be implemented in any type of computing platform operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device.

[0166] Aspects of the present invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage media, RAM, ROM, etc., such that it can be read by a programmable computer and, when the storage medium or device is read by the computer, can be used to configure and operate the computer to perform the processes described herein.

[0167] Additionally, the machine-readable code, or portions thereof, can be transmitted over a wired or wireless network.

[0168] The invention described herein includes these and other various types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor.

[0169] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pure electric vehicle air pump control system, comprising a vehicle controller (1), a high-voltage distribution box (2), an air pump controller (3), an air pump (4), a dryer (5), an air reservoir (6), an air pressure sensor (7) and an instrument (8), characterized in that: The vehicle controller (1) is connected to the instrument (8) and the air pump controller (3) respectively through the CAN network, and is connected to the unloading pressure switch inside the dryer (5) through a signal line. The high-voltage distribution box (2) is connected to the air pump controller (3) through a high-voltage line. The air pump controller (3) is connected to the air pump (4) through a high-voltage three-phase line. The air pump (4) is connected to the dryer (5) through a brake line. The air reservoir (6) is connected to the air pressure sensor (7) through a brake line. The air pressure sensor (7) is connected to the instrument (8) through a signal line. The vehicle controller (1) is used to receive various air pressure values ​​in real time and monitor the vehicle status. When the air pressure value is less than the set inflation pressure threshold and the vehicle status is satisfied, a work enable instruction is sent to the air pump controller (3). The high-voltage distribution box (2) is a high-voltage power distribution control element of the vehicle, which is used to provide high-voltage direct current to the air pump controller (3). The air pump controller (3) responds to the control instruction of the vehicle controller (1) to the air pump (4), controls the start and stop of the air pump (4), and detects the working status of the air pump (4) in real time, and uploads the bus current and fault code working status of the air pump (4) to the CAN bus.

2. The pure electric vehicle air pump control system according to claim 1, characterized in that: The dryer (5) is used to reduce the water content of the brake air circuit. The dryer (5) includes an unloading pressure switch. When it is detected that the dryer air pressure reaches a set pressure threshold, an unloading and exhaust action is performed and an unloading switch signal is sent to the vehicle controller (1).

3. The pure electric vehicle air pump control system according to claim 1, characterized in that: The meter (8) is used to collect the voltage signal of the air pressure sensor (7), display the air pressure value of the air reservoir (6), and send it to the vehicle controller (1) in real time via the CAN bus.

4. The pure electric vehicle air pump control system according to claim 1 or 3, characterized in that: The instrument (8) also displays brake system fault information sent by the vehicle controller (1) and the air pump controller (3).

5. The pure electric vehicle air pump control system according to claim 4, characterized in that: The vehicle controller (1) is also used to receive the air pressure values ​​of various lines and the dryer unloading pressure switch signal in real time, and when the air pressure value is greater than the set stop-inflation pressure threshold or the unloading pressure switch signal is valid, a work stop instruction is sent to the air pump controller (3).

6. The pure electric vehicle air pump control system according to claim 4, characterized in that: The vehicle controller (1) is also used to receive the bus current value of the air pump in real time. If the decrease value of the bus current value within 8 seconds is greater than the set value, and the front and rear air pressure values ​​are both greater than the set threshold, a work stop instruction is sent to the air pump controller (3).

7. The pure electric vehicle air pump control system according to claim 4, characterized in that: The vehicle controller (1) is also used to calculate the continuous operation time of the air pump (4). When the continuous operation time reaches a set value, the brake air circuit leaks, and a work stop instruction is sent to the air pump controller (3). At the same time, a leakage alarm is sent to the instrument (8). After that, two brake signals are detected and the operation is resumed after the set time value, and this cycle is repeated.

8. The pure electric vehicle air pump control system according to claim 1, characterized in that: There are multiple gas storage cylinders (6).

9. A method for controlling an air pump of a pure electric vehicle, characterized in that: The control method is applied to the pure electric vehicle air pump control system according to claim 1, and the control method includes the following steps: S1, the vehicle controller (1) collects vehicle status information through the CAN line and determines whether the following conditions are met: The vehicle's power supply is valid in ON position and lasts for 3 seconds; The high voltage relay of the air pump controller (3) is in the closed or stuck state; Front storage air pressure ≤ 0.7Mpa, lasting 0.5S; When all the above judgment conditions are met at the same time, the vehicle controller (1) sends an air pump operation enable signal; S2, the vehicle controller (1) sends an air pump operation enable instruction, and the air pump controller (3) receives the operation instruction to control the air pump (4) to operate; S3, the vehicle controller (1) collects vehicle status information, and when it determines that the parking power-off flag is valid, sends an air pump shutdown enable signal; S4, the vehicle controller (1) determines that the exhaust flag of the dryer (5) is valid by collecting the air pressure values ​​of the front and rear air tanks sent by the instrument (8) and the bus current value sent by the air pump controller (3), delays for 3 seconds, and sends the air pump shutdown enable; S5, the vehicle controller collects the air pressure values ​​of the front and rear air tanks sent by the instrument (8), and when the air pressure values ​​are both greater than 0.95 MPa, it delays 30 seconds and sends the air pump shutdown enable signal; S6, the vehicle controller collects the air pressure values ​​of the front and rear air tanks sent by the instrument (8), and when the air pressure is greater than 0.85 MPa and the dryer unloading pressure switch is valid, sends the air pump shutdown enable; S7. The vehicle controller calculates the running time of the air pump (4) in real time. When the air pump (4) works normally for 15 minutes and the air pressure value still does not reach the set value, the brake air circuit is leaking, the air pump is shut down and enabled, and a leakage fault prompt is sent to the instrument (8) for display. After detecting two brake signals, the operation is resumed for 15 minutes, and this cycle is repeated.

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