Electric inflating pump control method and system and electric automobile

Abstract

The invention relates to an electric inflation pump control method and system and an electric automobile, and the method comprises the steps that a low-voltage threshold switch is configured in an air pump system, and the low-voltage threshold switch is in an off state when the air pressure is higher than a preset switch value and is automatically closed when the air pressure is lower than the preset switch value; acquiring a low-voltage threshold switching signal and air pressure value signals of two paths of air tanks; judging the stable state of the air pressure value signal; switching a control mode of the electric inflating pump based on the stable state; when the air pressure value signal is in a stable state, starting and stopping of the electric blast pump are controlled according to the low-voltage threshold value switching signal and the judgment result of the air pressure value relative to the preset threshold value; and when the air pressure value signal is in an unstable state, the electric blast pump is controlled to start and stop only according to the low-voltage threshold switching signal.

Description

Technical Field

[0001] The present invention relates to the technical field of electric air pump control for new energy vehicles, and in particular to an electric air pump control method, system and electric vehicle. Background Art

[0002] At present, the most common braking method for pure electric commercial vehicles is to use an independent air pump to replace the engine for air supply. During operation, it is necessary to consider how to control the electric air pump to improve the operating safety of the vehicle. In the prior art, the air pressure of the air tank of the vehicle's brake system is read by the vehicle controller, the starting pressure value is set, the air pump is started to pump air, and when the air pressure reaches the set closing pressure value, the air pump is turned off.

[0003] However, the above method has great limitations. The control of the air pump depends only on the pressure value of the brake system. When the set pressure value is too high or too low, or the signal quality of the system pressure value is poor or lost, and the difference with the actual air pressure value is large, the air pump cannot be opened or closed in time, resulting in poor braking effect and potential safety hazards. At the same time, since the air pump cannot be closed in time, it will cause unnecessary energy consumption and shorten its lifespan. In addition, under certain working conditions, there may be insufficient air in the air tank, resulting in poor braking performance and potential safety hazards.

[0004] In view of this, how to design a new electric air pump control method to overcome the existing technical defects has become a technical problem that urgently needs to be solved. Summary of the invention

[0005] The invention discloses an electric air pump control method, a system and an electric vehicle, aiming to solve the technical problems existing in the prior art.

[0006] The present invention adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a method for controlling an electric air pump, the method comprising:

[0008] A low-pressure threshold switch is configured in the air pump system. The low-pressure threshold switch is in an open state when the air pressure is higher than a preset switch value, and automatically closes when the air pressure is lower than the preset switch value;

[0009] Obtain low-pressure threshold switch signal and air pressure value signals of two gas tanks;

[0010] Determine the stable state of the air pressure signal;

[0011] The control mode of the electric air pump is switched based on the stable state; when the air pressure value signal is in a stable state, the start and stop of the electric air pump is controlled according to the low-pressure threshold switch signal and the judgment result of the air pressure value relative to the preset threshold; when the air pressure value signal is in an unstable state, the start and stop of the electric air pump is controlled only according to the low-pressure threshold switch signal.

[0012] In some embodiments, before the step of determining the stable state of the air pressure value signal, the method further includes:

[0013] Determine whether the electric air pump is in working state, and adjust the judgment of the stable state of the air pressure value signal based on this.

[0014] In some embodiments, the step of determining the stable state of the air pressure value signal includes:

[0015] Within a first preset time period after the vehicle is awakened, the air pressure value signal is determined to be in an unstable state;

[0016] When the air pressure value signal loses communication, the air pressure value signal is determined to be in an unstable state;

[0017] In other cases, the air pressure value signal is determined to be in a stable state.

[0018] In some embodiments, when the air pressure value signal is in a stable state, the step of controlling the start and stop of the electric air pump according to the judgment result of the low pressure threshold switch signal and the air pressure value signal relative to the preset threshold value includes:

[0019] When it is determined that the electric air pump is not in working state, the low pressure threshold switch signal is valid, and any one of the two air pressure values ​​is less than the second pressure threshold, or both air pressure values ​​are less than the first pressure threshold, the electric air pump is started, otherwise the electric air pump is not started.

[0020] In some embodiments, when the air pressure value signal is in a stable state, the step of controlling the start and stop of the electric air pump according to the judgment result of the low pressure threshold switch signal and the air pressure value signal relative to the preset threshold value includes:

[0021] When it is determined that the electric air pump is in working state, the low pressure threshold switch signal is invalid, and any one of the two air pressure values ​​is greater than the third pressure threshold, the electric air pump is stopped, otherwise the electric air pump continues to work.

[0022] In some embodiments, when the air pressure value signal is in a stable state, the step of controlling the start and stop of the electric air pump according to the judgment result of the low pressure threshold switch signal and the air pressure value signal relative to the preset threshold value includes:

[0023] When it is determined that the electric air pump is in working state, the low-pressure threshold switch signal is valid, and any one of the two air pressure values ​​is greater than the fourth pressure threshold, it is determined that the low-pressure threshold switch has a fault and the electric air pump is stopped, otherwise the electric air pump continues to work.

[0024] In some embodiments, when the air pressure value signal is in an unstable state, the step of controlling the start and stop of the electric air pump only according to the low pressure threshold switch signal includes:

[0025] When the low-voltage threshold switch signal is valid, the electric air pump is started or the electric air pump continues to work;

[0026] When the low-pressure threshold switch signal is invalid, the electric air pump is stopped or not started.

[0027] In some embodiments, the method further comprises:

[0028] Get the current working condition of the vehicle;

[0029] When in the preset working condition, dynamically adjust the air pressure threshold for the electric air pump to stop working;

[0030] Preset operating conditions include:

[0031] The driving slope of the vehicle exceeds a preset slope threshold;

[0032] The downhill driving time of the vehicle exceeds a preset time threshold;

[0033] The actual load of the vehicle exceeds the preset load threshold;

[0034] The vehicle is in a long downhill driving state, and the slope or load exceeds the corresponding preset threshold.

[0035] In a second aspect, an embodiment of the present invention provides an electric air pump control system, comprising:

[0036] A low-pressure threshold switch configuration module is used to configure a low-pressure threshold switch in the air pump system. The low-pressure threshold switch is in an open state when the air pressure is higher than a preset switch value, and is automatically closed when the air pressure is lower than the preset switch value;

[0037] A signal acquisition module is used to obtain the low-pressure threshold switch signal and the air pressure value signals of the two gas tanks;

[0038] A state judgment module is used to judge the stable state of the air pressure value signal;

[0039] A control module is used to switch the control mode of the electric air pump based on a stable state; when the air pressure value signal is in a stable state, the start and stop of the electric air pump is controlled according to the low-pressure threshold switch signal and the judgment result of the air pressure value relative to a preset threshold; when the air pressure value signal is in an unstable state, the start and stop of the electric air pump is controlled only according to the low-pressure threshold switch signal.

[0040] In a third aspect, an embodiment of the present invention provides an electric vehicle, which can implement the electric air pump control method as described in any one of the above items.

[0041] One embodiment of the above invention has the following advantages or beneficial effects:

[0042] The embodiment of the present invention mainly provides an electric air pump control method, system and electric vehicle. Compared with the prior art, the method adds a signal source for controlling the operation of the electric air pump, which can enable the vehicle braking system to interact with the vehicle controller, thereby making the control of the electric air pump more precise. Specifically, by configuring a low-pressure threshold switch in the air pump system, and obtaining the low-pressure threshold switch signal and the air pressure value signal of the two-way air tank, the stable state of the air pressure value signal is comprehensively judged, and the control mode of the electric air pump is flexibly switched. This dual-signal control strategy improves the accuracy of starting and stopping the air pump, avoids safety hazards caused by signal loss or misjudgment, and ensures the reliability and safety of the vehicle braking system.

[0043] Furthermore, the control method can dynamically adjust the air pressure threshold at which the electric air pump stops working according to the actual working conditions of the vehicle. When the vehicle is in preset working conditions such as steep slope driving, long-term downhill driving, overload, etc., the air pressure threshold at which the air pump stops working is appropriately increased to ensure that the braking system has sufficient air pressure reserve. This adaptive adjustment strategy meets the requirements for braking performance under different working conditions, avoids poor braking effect due to insufficient air pressure, and greatly improves the safety performance of the vehicle under special working conditions.

[0044] The control method provided by the embodiment of the present invention avoids excessive work of the air pump through intelligent control, reduces unnecessary energy consumption, and prolongs the service life of the air pump. On the premise of meeting the safety requirements of the braking system, it effectively reduces the energy consumption of the whole vehicle, reduces the operating cost of the vehicle, and improves the energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] 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, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions explain the present invention and do not constitute improper limitations on the present invention. In the drawings:

[0046] Figure 1 A flowchart of a method for controlling an electric air pump according to an embodiment of the present invention;

[0047] Figure 2 A flowchart of a method for controlling an electric air pump according to another embodiment of the present invention;

[0048] Figure 3 A flow chart of an electric air pump control method provided by one embodiment of the present invention;

[0049] Figure 4 A structural block diagram of an electric air pump control system provided for one embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0051] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] As a core component in the braking system of pure electric commercial vehicles, the main function of the electric air pump is to provide sufficient compressed air for the air tank of the braking system to meet the energy requirements of the vehicle during braking. Its working principle is to drive the compressor through the electric motor to compress the outside air and store it in the air tank. When the driver steps on the brake pedal, the compressed air passes through the brake circuit and pushes the brake to work, so as to slow down or stop the vehicle.

[0053] In the prior art, the control of the electric air pump usually relies on the vehicle controller (VCU) of the vehicle to obtain the air pressure value in the gas tank. When the air pressure is lower than the set starting pressure threshold, the VCU controls the electric air pump to start working. When the air pressure reaches the set closing pressure threshold, the VCU controls the electric air pump to stop working. In short, the start and stop of the air pump depends entirely on the air pressure value signal provided by the air pressure sensor. However, this control method has obvious defects. For example, when the air pressure sensor signal quality is poor, errors occur, or the signal is lost, the VCU may not be able to accurately obtain the true air pressure value of the gas tank. At this time, the air pump may not be able to start and stop in time, resulting in the air pressure in the gas tank being too high or too low. If the air pressure in the gas tank is too low, it cannot provide sufficient braking force, affecting the braking performance of the vehicle, and there are serious safety hazards. If the air pressure in the gas tank is too high, it may cause damage to the air circuit system. When the air pump cannot be shut down in time, it will cause unnecessary energy consumption and increase the energy consumption of the vehicle. At the same time, long-term operation of the air pump will accelerate the wear of the equipment and shorten its service life.

[0054] To address the deficiencies in the prior art, the present invention provides an electric air pump control method in order to more accurately and reliably control the electric air pump. The method is preferably applicable to pure electric commercial vehicles, such as electric trucks, electric logistics vehicles, electric buses, electric transport vehicles, etc. For safety, reliability and performance considerations, the brake system of the pure electric commercial vehicle described in this embodiment is configured as a dual-circuit structure, and the two independent brake circuits are respectively supplied by independent gas tanks, and each air source is responsible for providing air pressure to a part of the brakes. In this way, even if one of the air sources fails or the air pressure is insufficient, the other air source can still continue to work to ensure that the function of the brake system is maintained. In this embodiment, the specific structure of the dual circuit is no longer specifically limited, and those skilled in the art can choose any existing implementation method according to actual needs.

[0055] refer to Figure 1 and Figure 3 In one embodiment of the present invention, the electric air pump control method at least includes steps S110 to S140.

[0056] Step S110, configuring a low-pressure threshold switch in the air pump system, the low-pressure threshold switch is in an open state when the air pressure is higher than a preset switch value, and automatically closes when the air pressure is lower than the preset switch value.

[0057] In one embodiment of the present invention, the low-pressure threshold switch is installed in the air pump system, specifically on the dryer, for real-time monitoring of the pressure state of the air pressure system. The low-pressure threshold switch is specifically configured as a low-pressure pressure switch, which is a switch device capable of sensing changes in air pressure, and its preset switch value is set according to the requirements of the vehicle braking system, ensuring that a signal can be sent in time when the air pressure drops to a level that cannot meet the braking requirements.

[0058] Specifically, the low-pressure threshold switch is communicatively connected to the vehicle controller (VCU). When the air pressure in the air pump system is higher than the preset switch value, the pressure on the low-pressure threshold switch is sufficient to keep it in the disconnected state. At this time, the switch is not conductive and does not provide a signal to the vehicle controller, indicating that the air pressure is within the normal range and the electric air pump does not need to be started. When the air pressure in the air pump system drops below the preset switch value, the low-pressure threshold switch automatically closes due to insufficient pressure, turning on the circuit and sending a valid electrical signal to the vehicle controller, indicating that the current air pressure is insufficient and the electric air pump needs to be started.

[0059] In one embodiment of the present invention, the preset switch value of the low-voltage threshold switch includes a lower trigger threshold and a higher release threshold. When the value is lower than the trigger threshold, the low-voltage threshold switch automatically closes; when the value is higher than the release threshold, the low-voltage threshold switch opens and closes.

[0060] By configuring a low-pressure threshold switch in the air pump system, an independent signal path is added to the control of the electric air pump. When the air pressure sensor signal is abnormal, delayed or lost, the low-pressure threshold switch can serve as a backup signal source to ensure that the electric air pump can be started in time when the air pressure is insufficient, avoiding the degradation of braking performance due to insufficient air pressure and improving the safety and reliability of vehicle operation.

[0061] After configuring the low-pressure threshold switch, the system can combine the two air pressure signals obtained in the subsequent steps to judge the stable state of the air pressure value, and accurately control the start and stop of the electric air pump according to different control modes, thereby achieving precise management of the brake system air pressure.

[0062] Step S120, obtaining the low pressure threshold switch signal and the air pressure value signals of the two gas tanks.

[0063] In one embodiment of the present invention, since the low-pressure threshold switch is a physical touch switch, its output signal is a switch value, that is, an open (disconnected) or closed (closed) state. When the air pressure is lower than the preset switch value, the switch is closed and the signal is valid; when the air pressure is higher than the preset switch value, the switch is disconnected and the signal is invalid.

[0064] In one embodiment of the present invention, an independent air pressure sensor is installed on each of the two gas tanks of the vehicle to detect the air pressure value in each gas tank in real time. The air pressure sensor converts the measured air pressure value into a standard electrical signal, which is then transmitted to the vehicle controller through the communication bus inside the vehicle. Specifically, in order to ensure the real-time control, the sampling frequency of the air pressure value signal should be high enough and can be set to tens of milliseconds to hundreds of milliseconds, so as to timely reflect the changes in air pressure.

[0065] Specifically, the specific model, position and sampling frequency of the air pressure sensor are not specifically limited in this embodiment, and those skilled in the art can make adaptive selections or adjustments according to actual needs of the vehicle.

[0066] Step S130, determining the stable state of the air pressure signal.

[0067] Since the working state of the electric air pump may affect the changing speed and trend of the air pressure value, thereby affecting the stability judgment of the air pressure value signal, in one embodiment of the present invention, step S130 also includes: judging whether the electric air pump is in a working state, and adjusting the judgment of the stability state of the air pressure value signal based on this.

[0068] In one embodiment of the present invention, within the first preset time period after the vehicle is awakened, the air pressure value signal is determined to be in an unstable state; when the air pressure value signal loses communication, the air pressure value signal is determined to be in an unstable state; in other cases, the air pressure value signal is determined to be in a stable state.

[0069] Specifically, when the vehicle is just awakened, the air pressure signal gradually rises from 0. The air pressure sensor needs a certain amount of time to reach a stable working state. The air pressure signal at this time may fluctuate or be delayed greatly. Direct reliance on the air pressure signal for control may lead to misjudgment. Therefore, within the first preset time period after the vehicle is awakened, the system will judge the air pressure signal as an unstable state. During this period, the start and stop of the electric air pump is controlled only according to the low-pressure threshold switch signal to ensure the reliability of control.

[0070] In one embodiment of the present invention, the first preset time period may be set to 5 to 10 seconds.

[0071] Furthermore, during vehicle operation, the air pressure signal may be lost or unavailable due to sensor failure, line problems or communication abnormalities. If the air pressure signal continues to be relied upon at this time, control errors may occur. Therefore, when the air pressure signal is detected to have communication lost or cannot be obtained normally, the system will judge the air pressure signal as an unstable state. Similarly, the start and stop of the electric air pump is controlled only based on the low-pressure threshold switch signal to ensure the safety of the braking system.

[0072] In other cases, the air pressure signal is judged to be in a stable state. At this time, the vehicle is in normal operation, the air pressure sensor is working normally, and the air pressure signal can be transmitted stably and continuously. Therefore, the air pressure signal and the low-pressure threshold switch signal can be comprehensively utilized to accurately control the start and stop of the electric air pump.

[0073] Step S140, switching the control mode of the electric air pump based on the stable state; when the air pressure value signal is in a stable state, controlling the start and stop of the electric air pump according to the low-pressure threshold switch signal and the judgment result of the air pressure value relative to the preset threshold; when the air pressure value signal is in an unstable state, controlling the start and stop of the electric air pump only according to the low-pressure threshold switch signal.

[0074] In this step, the control accuracy is improved by making full use of the reliable air pressure value signal. When the signal is unreliable, the newly added signal source (low-pressure threshold switch signal) is used to control the electric air pump to ensure the safety and basic functions of the braking system.

[0075] In one embodiment of the present invention, when it is determined that the electric air pump is not in a working state, the low-pressure threshold switch signal is valid, and either of the two air pressure values ​​is less than the second pressure threshold, or both air pressure values ​​are less than the first pressure threshold, the electric air pump is started, otherwise the electric air pump is not started.

[0076] In one embodiment of the present invention, the first pressure threshold is set as the lowest safe value of air pressure. When the air pressure values ​​of both channels are lower than this value, the electric air pump needs to be started immediately. The second pressure threshold is based on the trigger threshold of the low pressure threshold switch, which is slightly higher than the first pressure threshold. It provides a quick response to the situation where the air pressure of any gas tank is too low. Specifically, the first pressure threshold is set to 750kPa, and the second pressure threshold is set to 850kPa.

[0077] Specifically, when the electric air pump is not in working state, but the low-pressure threshold switch signal is valid, it means that the air pressure is lower than the trigger threshold and needs to be supplemented; when the air pressure values ​​of both channels are less than the first pressure threshold, it means that the overall air pressure level is low and the air pump needs to be started; when the air pressure value of any channel is less than the second pressure threshold, it means that the air pressure of one of the air tanks has dropped to a low level and needs to be inflated as soon as possible. According to the above two conditions, an activation command can be sent to the electric air pump to prevent the electric air pump from being unable to be activated due to poor signal quality or loss of the system pressure value, resulting in poor vehicle braking effect.

[0078] In one embodiment of the present invention, when it is determined that the electric air pump is in working state, the low pressure threshold switch signal is invalid, and any one of the two air pressure values ​​is greater than the third pressure threshold, the electric air pump is stopped, otherwise the electric air pump continues to work.

[0079] In one embodiment of the present invention, the third pressure threshold is based on the release threshold set by the low pressure threshold switch. When the low pressure threshold switch detects a change in air pressure at the dryer, it is necessary to monitor the air pressure of any one of the gas tanks to reach the air pressure threshold to jointly ensure the accuracy of the air pressure value to control the start and stop of the electric air pump. Specifically, the third pressure threshold is set to 1000kPa.

[0080] Specifically, when the electric air pump is in working state, the low-pressure threshold switch signal is invalid, indicating that the air pressure has returned to normal levels. A secondary verification is performed by any air pressure value being greater than the third pressure threshold, indicating that the air pressure has returned to a higher level. To prevent over-inflation, the air pump needs to be stopped. If any air pressure value is found to have not reached the third pressure threshold after secondary verification, the more accurate air pressure value is used as the basis, and it is determined that the conditions for completing inflation have not yet been met, so the electric air pump continues to work.

[0081] In one embodiment of the present invention, when it is determined that the electric air pump is in working state, the low-pressure threshold switch signal is valid, and any one of the two air pressure values ​​is greater than the fourth pressure threshold, it is determined that the low-pressure threshold switch has failed and the electric air pump is stopped, otherwise the electric air pump continues to work.

[0082] In one embodiment of the present invention, the fourth pressure threshold is configured as 1100 kPa; the fourth pressure threshold is due to the damage of the low pressure threshold switch, but after reaching the third pressure threshold during the inflation process, the low pressure threshold switch signal is still valid, and the calibrated confirmation interval is then. That is, from 1000 to 1100 kPa, the low pressure threshold switch is still valid, and when the air pressure value of one of the gas tanks is greater than the fourth pressure threshold, the air pump stops working.

[0083] Specifically, when the low-pressure threshold switch signal is valid, but the air pressure value has reached a higher level, which is inconsistent with the normal situation, it is judged that the low-pressure threshold switch is faulty. For safety reasons, the electric air pump is stopped immediately to prevent over-inflation. At the same time, an alarm can be sent to the driver or maintenance system to prompt the low-pressure threshold switch to check.

[0084] In one embodiment of the present invention, when the air pressure value signal is in an unstable state, the low-pressure threshold switch is relied upon as a reliable physical trigger signal to ensure that the electric air pump can be started in time when the air pressure is lower than the preset value. Specifically, when the low-pressure threshold switch signal is valid, the electric air pump is started or the electric air pump continues to work; when the low-pressure threshold switch signal is invalid, the electric air pump is stopped or not started.

[0085] When the air pressure signal is unstable, it may be because the air pressure sensor fails due to damage or aging, causing the output air pressure value to deviate from the normal value; or the communication bus fails, is interrupted or interfered with, and the vehicle controller cannot obtain the correct air pressure signal; or the air pressure sensor / communication bus cannot work normally due to environmental factors; or the vehicle is just starting up, and the air pressure sensor needs a certain amount of time to perform self-check and initialization. At this time, the air pressure signal may be unstable or unavailable.

[0086] The low-pressure threshold switch is a physical mechanical device that responds directly to changes in air pressure and is not easily affected by electrical failures or communication interference. Therefore, it can work normally and provide accurate working signals even when the electronic system fails.

[0087] When the air pressure signal is unstable, if the low-pressure threshold switch signal is judged to be valid, it means that the air pressure is lower than the preset trigger threshold, and the electric air pump is immediately started, or continues to work, to replenish the air pressure and ensure that the braking system has sufficient air pressure; if the low-pressure threshold switch signal is judged to be invalid, it means that the air pressure is higher than the preset release threshold. At this time, the electric air pump is controlled to stop, or remain in the non-start state to avoid over-inflation, save energy and prevent over-pressure in the air system.

[0088] In one embodiment of the present invention, when the vehicle is in special working conditions such as long-term downhill or heavy load, the braking frequency increases, the compressed air consumption increases, and the existing control method cannot be adjusted dynamically, and insufficient air pressure supply may occur, further exacerbating the braking safety hazard. To solve this problem, Figure 2 , in one embodiment of the present invention, further comprising:

[0089] Step S150, obtaining the current operating condition of the vehicle.

[0090] Step S160, when in a preset working condition, dynamically adjust the air pressure threshold at which the electric air pump stops working.

[0091] In one embodiment of the present invention, the preset operating conditions include: the vehicle's driving slope exceeds a preset slope threshold, the vehicle's downhill driving time exceeds a preset time threshold, the vehicle's actual load exceeds a preset load threshold, the vehicle is in a long downhill driving state, and the slope or load exceeds the corresponding preset threshold; the air pressure threshold at which the electric air pump stops working is also the third pressure threshold mentioned above.

[0092] Specifically, the vehicle controller obtains the current working condition information of the vehicle in real time through various sensors and data processing systems of the vehicle, so as to dynamically adjust the control strategy of the electric air pump under specific conditions. In this embodiment, it is not specifically limited how to obtain the various working conditions of the vehicle. Those skilled in the art can use any implementation method disclosed in the prior art to obtain the working condition, process the original working condition data, and compare it with the preset threshold value.

[0093] In one embodiment of the present invention, when the driving slope of the vehicle exceeds a first preset slope threshold, the air pressure threshold at which the electric air pump stops working is increased.

[0094] Specifically, the slope corresponding to the first preset slope threshold is 8% to 15%, indicating that the vehicle is currently traveling on a steep slope. The vehicle needs to brake frequently, the compressed air consumption of the braking system increases, and a higher air pressure reserve is required. At this time, the air pressure threshold at which the electric air pump stops working is increased by 10%.

[0095] In one embodiment of the present invention, when the vehicle's driving slope is less than a second preset slope threshold, but the downhill driving time exceeds a preset time threshold, or a single downhill distance exceeds a preset length threshold, the air pressure threshold at which the electric air pump stops working is increased.

[0096] Specifically, the second preset slope threshold corresponds to a slope of 3% to 8%, indicating that the vehicle is currently traveling on a gentle slope, and the downhill distance or downhill driving time of the vehicle is relatively long. At this time, the specific value is not limited. At this time, even if the slope is small, the number of braking times accumulates and the compressed air consumption still increases. It is preferred to increase the air pressure threshold at which the electric air pump stops working by 10%.

[0097] In one embodiment of the present invention, when the actual load of the vehicle is greater than a preset load threshold, the air pressure threshold at which the electric air pump stops working is increased.

[0098] Specifically, when it is detected that the actual load of the vehicle is greater than the rated vehicle weight, the vehicle inertia increases due to the increased load, so more compressed air is needed during braking. At this time, the air pressure threshold at which the electric air pump stops working is preferably increased by 10%.

[0099] In one embodiment of the present invention, when the vehicle's driving slope is less than a second preset slope threshold, the downhill driving time exceeds the preset time threshold, or the single downhill distance exceeds the preset length threshold, and the actual load of the vehicle is greater than the preset load threshold, the air pressure threshold at which the electric air pump stops working is increased.

[0100] At this time, due to the combined influence of load and long downhill, the brake system is under greater load and requires a higher air pressure reserve, so the air pressure threshold at which the electric air pump stops working is preferably increased by 20%.

[0101] In one embodiment of the present invention, when the driving slope of the vehicle is greater than a first preset slope threshold and the actual load of the vehicle is greater than a preset load threshold, the air pressure threshold at which the electric air pump stops working is increased.

[0102] At this time, due to the combined effects of the vehicle's load and steep slope, the braking frequency and intensity are increased, so the air pressure threshold at which the electric air pump stops working is preferably increased by 20%.

[0103] In one embodiment of the present invention, when the vehicle's driving slope is greater than a first preset slope threshold, the downhill driving time exceeds a preset time threshold, or a single downhill distance exceeds a preset length threshold, the air pressure threshold at which the electric air pump stops working is increased.

[0104] Specifically, long steep slopes put the greatest test on the braking system, which requires sufficient air pressure to support the braking force, so the air pressure threshold at which the electric air pump stops working is preferably increased by 20%.

[0105] In one embodiment of the present invention, when the vehicle's driving slope is greater than a first preset slope threshold, the downhill driving time exceeds the preset time threshold, or the single downhill distance exceeds the preset length threshold, and the actual load of the vehicle is greater than the preset load threshold, the air pressure threshold at which the electric air pump stops working is increased.

[0106] Since the most severe working conditions such as maximum load, long distance and steep slope are combined at this time, the highest air pressure reserve is required, so the air pressure threshold at which the electric air pump stops working is preferably increased by 30%.

[0107] In one embodiment of the present invention, the working condition of the vehicle is continuously monitored, and when the vehicle leaves the preset working condition, the air pressure threshold at which the electric air pump stops working is restored to the original value.

[0108] Through steps S150 and S160, the vehicle controller can dynamically adjust the air pressure threshold at which the electric air pump stops working according to the real-time working conditions of the vehicle. Under certain working conditions, the air pressure threshold is increased to increase the reserve of compressed air and ensure the reliability and safety of the braking system under high load conditions. At the same time, under normal working conditions, the original threshold is restored to avoid unnecessary energy consumption and meet diverse driving needs.

[0109] like Figure 4 In one embodiment of the present invention, an electric air pump control system 200 is also provided, comprising:

[0110] The low-pressure threshold switch configuration module 210 is used to configure a low-pressure threshold switch in the air pump system. The low-pressure threshold switch is in an open state when the air pressure is higher than a preset switch value, and is automatically closed when the air pressure is lower than the preset switch value.

[0111] The signal acquisition module 220 is used to obtain the low-pressure threshold switch signal and the air pressure value signals of the two gas tanks.

[0112] The state determination module 230 is used to determine the stable state of the air pressure value signal.

[0113] The control module 240 is used to switch the control mode of the electric air pump based on a stable state; when the air pressure value signal is in a stable state, the start and stop of the electric air pump is controlled according to the low-pressure threshold switch signal and the judgment result of the air pressure value relative to the preset threshold; when the air pressure value signal is in an unstable state, the start and stop of the electric air pump is controlled only according to the low-pressure threshold switch signal.

[0114] In one embodiment of the present invention, the electric air pump control system 200 further includes a dynamic adjustment module 250 for acquiring the current working condition of the vehicle and dynamically adjusting the air pressure threshold at which the electric air pump stops working when the vehicle is in a preset working condition.

[0115] It should be noted that the electric air pump control system and the electric air pump control method provided in the above embodiments belong to the same concept, and their specific implementation processes are detailed in the embodiments of the control method, which will not be described one by one here.

[0116] The embodiment of the present invention further provides an electric vehicle, which can implement the electric air pump control method described in the above embodiment, or is equipped with the electric air pump control system described in the above embodiment. The electric vehicle described in this embodiment is preferably a pure electric commercial vehicle and has a dual-circuit braking structure.

[0117] An embodiment of the present invention further provides an electronic device, which includes a memory and a processor, wherein a computer program executed by the processor is stored in the memory, and when the computer program is executed by the processor, the processor executes the electric air pump control method described above. Various applications and various data may also be stored in the memory, such as various data used and / or generated by the application. The processor may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other forms of processing units having data processing capabilities and / or instruction execution capabilities.

[0118] The embodiment of the present invention further provides a computer-readable storage medium, on which a computer program executed by a processor is stored. When the computer program is executed by the processor, the processor executes the electric air pump control method as described above. Exemplarily, the computer storage medium may include a memory card of a smart phone, a storage component of a tablet computer, a hard disk of a personal computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disk read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium may be any combination of one or more computer-readable storage media.

[0119] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0120] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0121] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0122] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0123] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A method for controlling an electric air pump, characterized in that: The method comprises: A low-pressure threshold switch is configured in the air pump system, wherein the low-pressure threshold switch is in an open state when the air pressure is higher than a preset switch value, and automatically closes when the air pressure is lower than the preset switch value; Obtain low-pressure threshold switch signal and air pressure value signals of two gas tanks; Determining the stable state of the air pressure value signal; The control mode of the electric air pump is switched based on a stable state; when the air pressure value signal is in a stable state, the start and stop of the electric air pump is controlled according to the low-pressure threshold switch signal and the judgment result of the air pressure value relative to a preset threshold; when the air pressure value signal is in an unstable state, the start and stop of the electric air pump is controlled only according to the low-pressure threshold switch signal.

2. The electric air pump control method according to claim 1, characterized in that: Before the step of determining the stable state of the air pressure value signal, the method further includes: Determine whether the electric air pump is in working state, and adjust the determination of the stable state of the air pressure value signal based on this.

3. The electric air pump control method according to claim 2, characterized in that: The step of determining the stable state of the air pressure value signal includes: Within a first preset time period after the vehicle is awakened, determining the air pressure value signal as being in an unstable state; When the air pressure value signal loses communication, the air pressure value signal is determined to be in an unstable state; In other cases, the air pressure value signal is determined to be in a stable state.

4. The electric air pump control method according to claim 3, characterized in that: In the step of controlling the start and stop of the electric air pump according to the low-pressure threshold switch signal and the judgment result of the air pressure value signal relative to the preset threshold when the air pressure value signal is in a stable state, the step includes: When it is determined that the electric air pump is not in working state, the low-pressure threshold switch signal is valid, and any one of the two air pressure values ​​is less than the second pressure threshold, or both air pressure values ​​are less than the first pressure threshold, the electric air pump is started, otherwise the electric air pump is not started.

5. The electric air pump control method according to claim 3, characterized in that: In the step of controlling the start and stop of the electric air pump according to the low-pressure threshold switch signal and the judgment result of the air pressure value signal relative to the preset threshold when the air pressure value signal is in a stable state, the step includes: When it is determined that the electric air pump is in working state, the low-pressure threshold switch signal is invalid, and any one of the two air pressure values ​​is greater than the third pressure threshold, the electric air pump is stopped, otherwise the electric air pump continues to work.

6. The electric air pump control method according to claim 3, characterized in that: In the step of controlling the start and stop of the electric air pump according to the low-pressure threshold switch signal and the judgment result of the air pressure value signal relative to the preset threshold when the air pressure value signal is in a stable state, the step includes: When it is determined that the electric air pump is in working state, the low-pressure threshold switch signal is valid, and any one of the two air pressure values ​​is greater than the fourth pressure threshold, it is determined that the low-pressure threshold switch has a fault and the electric air pump is stopped, otherwise the electric air pump continues to work.

7. The electric air pump control method according to claim 3, characterized in that: In the step of controlling the start and stop of the electric air pump only according to the low-pressure threshold switch signal when the air pressure value signal is in an unstable state, the step includes: When the low-voltage threshold switch signal is valid, starting the electric air pump or making the electric air pump continue to work; When the low-pressure threshold switch signal is invalid, the electric air pump is stopped or not started.

8. The electric air pump control method according to claim 1, characterized in that: The method further comprises: Get the current working condition of the vehicle; When in a preset working condition, dynamically adjust the air pressure threshold at which the electric air pump stops working; The preset working conditions include: The driving slope of the vehicle exceeds a preset slope threshold; The downhill driving time of the vehicle exceeds a preset time threshold; The actual load of the vehicle exceeds the preset load threshold; The vehicle is in a long downhill driving state, and the slope or load exceeds the corresponding preset threshold.

9. An electric air pump control system, characterized in that: include: A low-pressure threshold switch configuration module, used to configure a low-pressure threshold switch in the air pump system, wherein the low-pressure threshold switch is in an open state when the air pressure is higher than a preset switch value, and automatically closes when the air pressure is lower than the preset switch value; A signal acquisition module is used to obtain the low-pressure threshold switch signal and the air pressure value signals of the two gas tanks; A state judgment module, used for judging the stable state of the air pressure value signal; A control module for switching the control mode of the electric air pump based on a stable state; when the air pressure value signal is in a stable state, the start and stop of the electric air pump is controlled according to the low-pressure threshold switch signal and the judgment result of the air pressure value relative to a preset threshold; when the air pressure value signal is in an unstable state, the start and stop of the electric air pump is controlled only according to the low-pressure threshold switch signal.

10. An electric vehicle, characterized in that: The electric vehicle can implement the electric air pump control method as described in any one of claims 1-8.

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