A start-stop control method, device and medium based on an electric air compressor

Abstract

The embodiment of the specification discloses a start-stop control method and device based on an electric air compressor, equipment and medium, which relates to the technical field of new energy vehicles, and the method comprises the following steps: monitoring the air pressure of the air storage device in the new energy vehicle, and obtaining the current air storage pressure value of the new energy vehicle; according to the current air storage pressure value and the predetermined specified air pressure threshold value, the starting condition of the electric air compressor is checked, the specified air pressure threshold value is related to the current vehicle state of the new energy vehicle, when the electric air compressor has the starting condition, the electric air compressor is started to determine a plurality of real-time monitoring data, the real-time monitoring data includes the real-time air storage pressure value of the air storage device and the opening and closing degree data of the brake pedal; through the plurality of real-time monitoring data, the shutdown condition of the electric air compressor is checked to determine whether the electric air compressor has the shutdown condition; when the electric air compressor has the shutdown condition, the electric air compressor is controlled to be in the shutdown state to stop the air charging.

Description

Technical Field

[0001] This specification relates to the field of new energy vehicle technology, and in particular to a start-stop control method, equipment and medium based on an electric air compressor. Background Technology

[0002] The Air Processing Unit (APU) provides dry, clean compressed air to ensure normal vehicle operation. Traditional new energy vehicles typically use an electronically controlled APU to control the electric air compressor. The control logic primarily relies on the pressure sensor built into the APU: if the output pressure is less than or equal to the shut-off pressure, the APU outputs a high level to the vehicle controller, which then controls the electric air compressor to start operating via a multi-function controller; if the output pressure is greater than or equal to the shut-off pressure, the APU outputs a low level to the vehicle controller, which then controls the electric air compressor to stop operating via a multi-function controller; if the APU consistently outputs a low level, but the instrument pressure value is greater than or equal to the safety value (the safety value varies depending on the platform), the vehicle controller controls the electric air compressor to stop operating via a multi-function controller. The electronically controlled APU controls the shut-off and exhaust cut-off via solenoid valves, providing precise control and ensuring the normal start-stop and backflushing operation of the electronically controlled dryer. However, electronically controlled APUs are expensive, and the increased control signals and wiring increase potential failure points and make maintenance more difficult.

[0003] To reduce hardware costs during the development of new energy vehicles, air compressors can be controlled using traditional mechanical APU structures. However, the return and cut-off pressures of traditional mechanical APU structures are controlled by built-in springs. Due to assembly and spring consistency issues, these pressures fall within a certain range. This inaccuracy in pressure control leads to problems such as the actual cut-off pressure being too low or too high: if the actual cut-off pressure is less than the set cut-off pressure, the air compressor will operate continuously, shortening its lifespan and increasing energy consumption; if the actual cut-off pressure is greater than the set cut-off pressure, the mechanical APU cannot perform the backflushing function, affecting its lifespan. In conclusion, when using traditional mechanical APUs to control the start and stop of air compressors, the low pressure accuracy results in an inefficient start-stop control process. Summary of the Invention

[0004] This specification provides one or more embodiments of a start-stop control method, device, and medium based on an electric air compressor, which is used to solve the following technical problem: When the start-stop control of the air compressor is performed by a traditional mechanical APU, the pressure value of the traditional mechanical APU has low accuracy, resulting in a lack of rationality in the start-stop control process of the air compressor.

[0005] One or more embodiments of this specification employ the following technical solutions:

[0006] This specification provides one or more embodiments of a start-stop control method based on an electric air compressor. The method includes: monitoring the air pressure of an air storage device in a new energy vehicle to obtain the current air storage pressure value of the new energy vehicle; verifying the start-up conditions of the electric air compressor based on the current air storage pressure value of the new energy vehicle and a pre-determined specified air pressure threshold, wherein the specified air pressure threshold is related to the current vehicle state of the new energy vehicle; when the electric air compressor meets the start-up conditions, controlling the electric air compressor to start and performing real-time monitoring of the new energy vehicle to determine multiple real-time monitoring data, wherein the real-time monitoring data includes the real-time air storage pressure value of the air storage device and brake pedal opening / closing data; verifying the stop-up conditions of the electric air compressor using the multiple real-time monitoring data to determine whether the electric air compressor meets the stop-up conditions; when the electric air compressor meets the stop-up conditions, controlling the electric air compressor to a stop state to stop pumping air.

[0007] Furthermore, the shutdown conditions of the electric air compressor are verified using the multiple real-time monitoring data to determine whether the electric air compressor meets the shutdown conditions. Specifically, this includes: determining the pressure acquisition time for each real-time storage air pressure value to obtain the corresponding operating state of the electric air compressor within each pressure acquisition time, wherein the operating state includes a start-up state and a shutdown state; based on the operating state of the electric air compressor within each pressure acquisition time, filtering the multiple real-time storage air pressure values ​​in the real-time monitoring data to obtain multiple specified real-time storage air pressure values ​​within the electric air compressor's start-up cycle; performing an initial shutdown verification on the electric air compressor using the specified real-time storage air pressure values ​​to ensure the operational safety of the new energy vehicle; when the electric air compressor passes the initial shutdown verification, performing a secondary shutdown verification on the electric air compressor using the multiple real-time storage air pressure values ​​and brake pedal opening / closing data from the multiple real-time monitoring data; and determining that the electric air compressor meets the shutdown conditions when it passes the secondary shutdown verification.

[0008] Further, the electric air compressor is initially shut down using the specified real-time storage air pressure value. Specifically, this includes: obtaining the standard air pressure value corresponding to the new energy vehicle and the starting calibration air pressure value for starting the engine within the electric air compressor's start-up cycle; performing an initial shutdown verification on the electric air compressor using the multiple specified real-time storage air pressure values, the standard air pressure value, and the starting calibration air pressure value; and verifying that any one of the multiple specified real-time storage air pressure values ​​is greater than the standard air pressure value. Furthermore, if the current specified air storage pressure value among the plurality of specified real-time air storage pressure values ​​is not less than the start-up calibration pressure value, the electric air compressor is determined to have passed the initial shutdown check; if none of the plurality of specified real-time air storage pressure values ​​is greater than the standard pressure value, or if the current specified air storage pressure value among the plurality of specified real-time air storage pressure values ​​is less than the start-up calibration pressure value, the electric air compressor is determined to have failed the initial shutdown check, and the electric air compressor is controlled to continue pumping air.

[0009] Furthermore, the electric air compressor undergoes a secondary shutdown verification using multiple real-time air storage pressure values ​​and brake pedal opening / closing data from the multiple real-time monitoring data. Specifically, this includes: acquiring a pre-set continuous operating time threshold; comparing the multiple specified real-time air storage pressure values ​​sequentially with the standard air pressure value according to the acquisition time; when a first real-time air storage pressure value greater than the standard air pressure value is found among the specified real-time air storage pressure values, timing begins from the acquisition time corresponding to the first real-time air storage pressure value to determine the continuous operating time of the electric air compressor; when the continuous operating time exceeds the preset operating time threshold, it is determined that the electric air compressor has passed the secondary shutdown verification, and the electric air compressor is controlled to shut down to stop pumping air.

[0010] Further, after determining the continuous operating time of the electric air compressor, the method further includes: when the continuous operating time is not greater than a preset operating time threshold, obtaining a pre-set unloading pressure threshold; determining the unloading state by comparing the multiple specified real-time storage air pressure values ​​with the unloading pressure threshold; when the multiple specified real-time storage air pressure values ​​are greater than the unloading pressure threshold, determining the unloading state as an unloading occurrence state; when the unloading state is the unloading occurrence state, determining the current unloading gradient within a specified time interval based on the multiple specified real-time storage air pressure values; when the current unloading gradient within the specified time interval is greater than the pre-determined exhaust gradient corresponding to the exhaust device, obtaining multiple brake pedal opening / closing degree data within the specified time interval. The system determines the change in brake pedal opening degree within a specified time interval using the specified pedal opening degree data. When the change in brake pedal opening degree is not greater than a preset change threshold, the system determines that the electric air compressor has passed the secondary shutdown check and controls the electric air compressor to stop pumping air. If the continuous running time is not greater than a preset running time threshold, and the specified real-time air pressure values ​​are not greater than the unloading pressure threshold, or the current unloading gradient within the specified time interval is not greater than the pre-determined exhaust gradient corresponding to the exhaust device, or the change in brake pedal opening degree is greater than a preset change threshold, the system determines that the electric air compressor has failed the secondary shutdown check and controls the electric air compressor to continue pumping air.

[0011] Further, obtaining the preset continuous operating time threshold specifically includes: determining the theoretical continuous operating time of the electric air compressor, wherein the theoretical continuous operating time is the operating time for increasing the storage air pressure from the standard air pressure value to the unloading air pressure threshold; and setting the continuous operating time threshold according to the theoretical continuous operating time and a preset correction factor, wherein the preset correction factor takes values ​​within a specified range.

[0012] Furthermore, after determining the continuous operating time of the electric air compressor, the method further includes: obtaining the device parameters of the air storage device, wherein the device parameters include the diameter of the air storage device and the volume of the air storage device; determining the exhaust gradient using the diameter of the air storage device and the volume of the air storage device, wherein the exhaust gradient is positively correlated with the diameter of the air storage device and negatively correlated with the volume of the air storage device.

[0013] Further, the starting conditions of the electric air compressor are verified based on the current air pressure value of the new energy vehicle and a pre-determined specified air pressure threshold. Specifically, this includes: collecting the current operating data of the new energy vehicle; determining the current vehicle state based on the current operating data, where the current vehicle state includes a stationary state and a driving state; determining the corresponding specified air pressure threshold in a pre-set air pressure threshold lookup table based on the current vehicle state, where the air pressure threshold lookup table includes multiple vehicle states and the corresponding air pressure threshold for each vehicle state; determining a first specified air pressure threshold when the current vehicle state is a stationary state, and determining a second specified air pressure threshold when the current vehicle state is a driving state, wherein the first specified air pressure threshold is less than the second specified air pressure threshold; and determining that the electric air compressor meets the starting conditions when the current air pressure value is less than the specified air pressure threshold, thereby controlling the electric air compressor to start for air inflation.

[0014] This specification provides one or more embodiments of a start-stop control device based on an electric air compressor, including:

[0015] At least one processor; and,

[0016] A memory communicatively connected to the at least one processor; wherein,

[0017] The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the above-described method.

[0018] This specification provides one or more embodiments of a non-volatile computer storage medium storing computer-executable instructions. These instructions are configured to: monitor the air pressure of an air storage device in a new energy vehicle to obtain the current air storage pressure value of the new energy vehicle; verify the starting conditions of an electric air compressor based on the current air storage pressure value of the new energy vehicle and a pre-determined specified air pressure threshold, wherein the specified air pressure threshold is related to the current vehicle state of the new energy vehicle; when the electric air compressor meets the starting conditions, control the electric air compressor to start and perform real-time monitoring of the new energy vehicle to determine multiple real-time monitoring data, wherein the real-time monitoring data includes the real-time air storage pressure value of the air storage device and brake pedal opening / closing data; verify the stopping conditions of the electric air compressor using the multiple real-time monitoring data to determine whether the electric air compressor meets the stopping conditions; when the electric air compressor meets the stopping conditions, control the electric air compressor to a stopped state to stop pumping air.

[0019] The above-mentioned at least one technical solution adopted in the embodiments of this specification can achieve the following beneficial effects: By using the above technical solution, the gas pressure of the gas storage device is monitored, and the starting conditions of the electric air compressor are judged according to the relationship between the gas storage pressure and the set specified gas pressure threshold, so as to control the start of the electric air compressor. After the electric air compressor starts, the gas pressure in the gas storage device is monitored in real time. The stopping conditions of the electric air compressor are judged by the real-time gas pressure value of the gas storage device and the brake pedal opening and closing data. When the stopping conditions are met, the electric air compressor is controlled to be in a stopped state. Based on the traditional mechanical APU structure, the hardware cost of new energy vehicles is reduced, and the drawback of the return pressure and cut-off pressure being in the same range in the traditional mechanical APU structure can be avoided, thus improving the rationality of the start and stop control of the electric air compressor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0021] Figure 1 A flowchart illustrating a start-stop control method based on an electric air compressor, provided as an embodiment of this specification;

[0022] Figure 2 A flowchart illustrating another start-stop control method based on an electric air compressor provided in the embodiments of this specification;

[0023] Figure 3 This is a schematic diagram of the start-stop control device based on an electric air compressor, provided as an embodiment of this specification. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0025] The Air Processing Unit (APU) provides dry, clean compressed air to ensure normal vehicle operation. Traditional new energy vehicles typically use an electronically controlled APU to control the electric air compressor. The control logic primarily relies on the pressure sensor built into the APU: if the output pressure is less than or equal to the shut-off pressure, the APU outputs a high level to the vehicle controller, which then controls the electric air compressor to start operating via a multi-function controller; if the output pressure is greater than or equal to the shut-off pressure, the APU outputs a low level to the vehicle controller, which then controls the electric air compressor to stop operating via a multi-function controller; if the APU consistently outputs a low level, but the instrument pressure value is greater than or equal to the safety value (the safety value varies depending on the platform), the vehicle controller controls the electric air compressor to stop operating via a multi-function controller. The electronically controlled APU controls the shut-off and exhaust cut-off via solenoid valves, providing precise control and ensuring the normal start-stop and backflushing operation of the electronically controlled dryer. However, electronically controlled APUs are expensive, and the increased control signals and wiring increase potential failure points and make maintenance more difficult.

[0026] To reduce hardware costs during the development of new energy vehicles, air compressors can be controlled using traditional mechanical APU structures. However, the return and cut-off pressures of traditional mechanical APU structures are controlled by built-in springs. Due to assembly and spring consistency issues, these pressures fall within a certain range. This inaccuracy in pressure control leads to problems such as the actual cut-off pressure being too low or too high: if the actual cut-off pressure is less than the set cut-off pressure, the air compressor will operate continuously, shortening its lifespan and increasing energy consumption; if the actual cut-off pressure is greater than the set cut-off pressure, the mechanical APU cannot perform the backflushing function, affecting its lifespan. In conclusion, when using traditional mechanical APUs to control the start and stop of air compressors, the low pressure accuracy results in an inefficient start-stop control process.

[0027] This specification provides a start-stop control method based on an electric air compressor. It should be noted that the execution entity in this specification embodiment can be a server or any device with data processing capabilities. Here, the server can be the vehicle controller, which controls the start-stop of the electric air compressor. Figure 1 A flowchart illustrating a start-stop control method based on an electric air compressor, as provided in the embodiments of this specification, is shown below. Figure 1 As shown, the main steps include the following:

[0028] Step S101: Monitor the gas pressure of the gas storage device in the new energy vehicle to obtain the current gas storage pressure value of the new energy vehicle.

[0029] In one embodiment of this specification, the air pressure of the air storage device in the new energy vehicle is monitored by a monitoring instrument, which can be used to obtain the air pressure value of the air storage device in the new energy vehicle as the current air storage pressure value. Here, the air storage device can be an air storage cylinder.

[0030] Step S102: Verify the starting conditions of the electric air compressor based on the current air storage pressure of the new energy vehicle and the predetermined specified air pressure threshold.

[0031] The specified air pressure threshold is related to the current vehicle status of the new energy vehicle;

[0032] In one embodiment of this specification, the starting conditions of the electric air compressor are verified by comparing the current air pressure value of the air storage tank with a pre-set specified air pressure threshold, so as to determine whether the electric air compressor can be started.

[0033] The starting conditions of the electric air compressor are verified based on the current air pressure value of the new energy vehicle and a pre-determined specified air pressure threshold. Specifically, this includes: collecting the current operating data of the new energy vehicle; determining the current vehicle status based on the current operating data, where the current vehicle status includes a stationary state and a driving state; determining the corresponding specified air pressure threshold from a pre-set air pressure threshold lookup table based on the current vehicle status, where the air pressure threshold lookup table includes multiple vehicle statuses and the corresponding air pressure threshold for each vehicle status; determining a first specified air pressure threshold when the current vehicle status is a stationary state, and determining a second specified air pressure threshold when the current vehicle status is a driving state, wherein the first specified air pressure threshold is less than the second specified air pressure threshold; and determining that the electric air compressor meets the starting conditions when the current air pressure value is not greater than the specified air pressure threshold, thereby controlling the electric air compressor to start for air inflation.

[0034] Specifically, in one embodiment of this specification, when verifying the starting conditions of the electric air compressor based on the current air storage pressure value of the new energy vehicle and a predetermined specified air pressure threshold, it is first necessary to determine the specified air pressure threshold. The specified air pressure threshold is related to the current operating state of the vehicle. Other thresholds corresponding to each operating state can be associated with each operating state and the corresponding other thresholds by setting an air pressure threshold lookup table.

[0035] The system collects current operating data from the new energy vehicle to determine its current state—whether it is stationary or in motion. This data can include engine data, vehicle speed, ignition data, or other operating data that determines whether the vehicle is stationary or in motion; no specific limitations are imposed here. Based on the current vehicle state, a pre-set air pressure threshold is determined from a pre-defined air pressure threshold lookup table. The first specified air pressure threshold for a stationary vehicle is 6.5 bar, and the second specified air pressure threshold for a moving vehicle is 7.2 bar. These thresholds can be determined based on empirical data to ensure safe driving. When the current air pressure in the storage tank is lower than the specified air pressure threshold, the electric air compressor is deemed ready to start, and it is controlled to start and begin pumping air.

[0036] The above technical solution determines the corresponding air pressure threshold based on the current operating status of the vehicle. The air pressure value in the air storage device is compared with the air pressure threshold to verify the starting conditions of the electric air compressor, thereby improving the rationality of the electric air compressor's start-up.

[0037] Step S103: When the electric air compressor meets the start-up conditions, control the electric air compressor to start and perform real-time monitoring on the new energy vehicle to determine multiple real-time monitoring data.

[0038] In one embodiment of this specification, when the electric air compressor meets the start-up conditions, the vehicle controller controls the electric air compressor to start, and the electric air compressor begins to inflate. The air pressure in the air storage device changes, and simultaneously, the driver performs driving actions. Therefore, the new energy vehicle is monitored in real time to determine multiple real-time monitoring data. These real-time monitoring data include the real-time air pressure value in the air storage device and the brake pedal opening / closing data.

[0039] Step S104: The shutdown conditions of the electric air compressor are verified by multiple real-time monitoring data to determine whether the electric air compressor meets the shutdown conditions.

[0040] The shutdown conditions of the electric air compressor are verified using multiple real-time monitoring data to determine whether it meets the shutdown requirements. Specifically, this includes: determining the pressure acquisition time for each real-time storage air pressure value to obtain the corresponding operating status of the electric air compressor at each acquisition time, including both start-up and shutdown states; filtering multiple real-time storage air pressure values ​​from the real-time monitoring data based on the operating status at each acquisition time to obtain multiple specified real-time storage air pressure values ​​within the compressor's start-up cycle; performing an initial shutdown verification on the electric air compressor using these specified real-time storage air pressure values ​​to ensure the safe operation of the new energy vehicle; performing a secondary shutdown verification on the electric air compressor using the multiple real-time storage air pressure values ​​and brake pedal opening / closing data from the real-time monitoring data; and determining that the electric air compressor meets the shutdown requirements when it passes the secondary shutdown verification.

[0041] Specifically, in one embodiment of this specification, the shutdown conditions of the electric air compressor are verified using multiple real-time monitoring data to determine whether the electric air compressor meets the shutdown conditions. First, the pressure acquisition time for each real-time storage air pressure value is determined, and the corresponding operating state of the electric air compressor at each real-time storage air pressure acquisition time is obtained. This operating state includes both start-up and shutdown states. Based on the operating state of the electric air compressor at each pressure acquisition time, multiple specified real-time storage air pressure values ​​within the start-up cycle of the electric air compressor are selected from the multiple real-time storage air pressure values ​​in the multiple real-time monitoring data. It should be noted that the electric air compressor start-up cycle refers to the start-up time corresponding to the nearest start-up of the air compressor to the current time, and the time period formed with the current time is the start-up cycle. The multiple specified real-time storage air pressure values ​​here are the air pressure values ​​within the start-up cycle corresponding to the electric air compressor after it has started and has not stopped. Using these multiple specified real-time storage air pressure values, an initial shutdown verification of the electric air compressor is performed to ensure the operational safety of new energy vehicles. When the electric air compressor passes the initial shutdown test, a secondary shutdown test is performed on the electric air compressor using multiple real-time storage air pressure values ​​and brake pedal opening / closing data from multiple real-time monitoring data. This secondary shutdown test can be a backflushing judgment. By backflushing judgment, it is determined whether the electric air compressor meets the shutdown conditions. When the electric air compressor passes the secondary shutdown test, it is determined that the electric air compressor meets the shutdown conditions.

[0042] The electric air compressor undergoes an initial shutdown check using the specified real-time air pressure value. Specifically, this includes: acquiring the standard air pressure value corresponding to the new energy vehicle and the starting calibration air pressure value for starting the engine within the electric air compressor's start-up cycle; performing an initial shutdown check on the electric air compressor using the specified real-time air pressure values, the standard air pressure value, and the starting calibration air pressure value; determining that the electric air compressor passes the initial shutdown check when any one of the specified real-time air pressure values ​​is greater than the standard air pressure value, and the current specified air pressure value among the specified real-time air pressure values ​​is not less than the starting calibration air pressure value; and determining that the electric air compressor fails the initial shutdown check when none of the specified real-time air pressure values ​​is greater than the standard air pressure value, or when the current specified air pressure value among the specified real-time air pressure values ​​is less than the starting calibration air pressure value, and controlling the electric air compressor to continuously pump air.

[0043] Specifically, in one embodiment of this specification, when performing initial shutdown verification of the electric air compressor using the specified real-time storage air pressure value, firstly, the standard air pressure value corresponding to the new energy vehicle and the starting calibration air pressure value for starting the engine within the electric air compressor start-up cycle are obtained. Here, the standard air pressure value can be set to 8.5 bar, and the starting calibration air pressure value for starting the engine within the electric air compressor start-up cycle is the air pressure threshold corresponding to the driving state at the time of start-up condition determination, which is the starting calibration air pressure value. The electric air compressor is then initially shut down using multiple specified real-time storage air pressure values, standard air pressure values, and starting calibration air pressure values.

[0044] If any one of the specified real-time storage air pressure values ​​is greater than the standard air pressure value, and the current specified storage air pressure value among the specified real-time storage air pressure values ​​is not less than the start-up calibration air pressure value, the electric air compressor is determined to have passed the initial shutdown check. In other words, if the air pressure value has exceeded the standard air pressure value during the current start-up cycle of the electric air compressor and the current air pressure is not lower than the start-up calibration air pressure value of the electric air compressor, the electric air compressor is determined to have passed the initial shutdown check.

[0045] If either of the above two conditions is not met—that is, if none of the multiple specified real-time air storage pressure values ​​is greater than the standard pressure value, or if the current specified air storage pressure value is less than the starting calibration pressure value—then the electric air compressor is determined to have failed the initial shutdown check, and the electric air compressor is controlled to continuously pump air. It should be noted that if the current specified air storage pressure value is less than the starting calibration pressure value, it indicates that the vehicle has stalled, the air pressure has dropped, and continuous pressurization is required to ensure driving safety; therefore, the electric air compressor is controlled to continuously pump air.

[0046] Specifically, in one embodiment of this specification, the electric air compressor is subjected to a secondary shutdown verification using multiple real-time air storage pressure values ​​and brake pedal opening / closing data from the multiple real-time monitoring data. A pre-set continuous operating time threshold is obtained, which is related to the theoretical continuous operating time. Here, the theoretical continuous operating time is the operating time required to increase the air storage pressure from the standard air pressure value to the unloading air pressure threshold. First, the theoretical continuous operating time of the electric air compressor is determined using empirical data. This theoretical continuous operating time can be the average of multiple empirical data. Generally, increasing the air pressure in the air storage tank from the standard air pressure value of 8.5 bar to the unloading air pressure threshold of 9.2 bar typically takes 80 to 90 seconds; here, the theoretical continuous operating time can be taken as 85 seconds. Obtain a preset correction factor. This correction factor can be set within the range of 1.5 to 2.5. To avoid the impact of pressure changes caused by the driver's vehicle operation on the start-stop control of the electric air compressor, a time margin is reserved based on the theoretical continuous running time by setting a correction factor. The smaller the correction factor, the shorter the running time of the air compressor within the start-up cycle. The specific value can be set according to user needs. The continuous running time threshold is obtained by calculating the product of the theoretical continuous running time and the correction factor.

[0047] Multiple specified real-time air storage pressure values ​​are compared with standard air pressure values ​​sequentially according to the collection time. When a first real-time air storage pressure value that is greater than the standard air pressure value is found for the first time, the timer starts from the collection time corresponding to the first real-time air storage pressure value to determine the continuous running time of the electric air compressor. When the continuous running time is greater than the preset running time threshold, it is determined that the electric air compressor has passed the secondary shutdown verification, and the electric air compressor is controlled to stop to stop pumping air.

[0048] When the continuous running time is no greater than a preset running time threshold, a pre-set unloading pressure threshold is obtained. The unloading status is determined by comparing multiple specified real-time storage gas pressure values ​​with the unloading pressure threshold. When multiple specified real-time storage gas pressure values ​​are greater than the unloading pressure threshold, the unloading status is determined to be unloading in progress. It should be noted that the unloading status includes both unloading in progress and unloading not occurring. When the unloading status is unloading in progress, it indicates that backflushing operation has begun. The current unloading gradient within a specified time interval is then determined based on multiple specified real-time storage gas pressure values. The current unloading gradient can be calculated as the ratio of the pressure unloading change within the specified time interval to the corresponding time interval. The specified time interval can be set to 3 seconds or other time intervals.

[0049] When the current unloading gradient within a specified time interval is greater than the pre-determined exhaust gradient corresponding to the exhaust device, multiple brake pedal opening / closing data within the specified time interval are acquired. It should be noted that the exhaust gradient corresponding to the exhaust device needs to be pre-determined. First, the device parameters of the air storage device are obtained, including the device diameter and volume. The exhaust gradient is determined using the device diameter and volume; the exhaust gradient is positively correlated with the device diameter and negatively correlated with the device volume. Here, the exhaust gradient represents the change in air pressure unloading within a fixed time interval. When determining the exhaust gradient using the device diameter and volume, exhaust simulation experiments can be conducted on air storage devices with different device parameters to obtain multiple experimental air pressure unloading values. These values ​​are then fitted to obtain the relationship between the exhaust gradient and the device diameter and volume. Other methods can also be used to determine the exhaust gradient.

[0050] By specifying the pedal opening and closing data, the change in the brake pedal opening and closing data within a specified time interval is determined. This change in opening and closing data is used to determine whether the change in current unloading pressure is caused by a backflushing operation. When the brake pedal is pressed, it will also cause a pressure drop. To avoid the current pressure drop being caused by the braking operation, it is necessary to determine the relationship between the change in the brake pedal opening and closing data and a preset change threshold. Here, the preset change threshold is a small value. The change range within this change threshold is used to represent the change range corresponding to non-braking conditions.

[0051] When the change in the opening degree of the brake pedal is not greater than the preset change threshold, that is, the change range of the brake pedal opening degree is small, and the brake pedal hardly changes within the specified time interval, it is determined that the pressure drop is not caused by external operation such as braking. Therefore, the electric air compressor has passed the secondary shutdown verification and the electric air compressor is controlled to stop to stop pumping air.

[0052] If the continuous running time is not greater than the preset running time threshold, and multiple specified real-time storage air pressure values ​​are not greater than the unloading air pressure threshold, or the current unloading gradient within the specified time interval is not greater than the pre-determined exhaust gradient corresponding to the exhaust device, or the brake pedal opening and closing degree change data is greater than the preset change threshold, it is determined that the electric air compressor has failed the secondary shutdown verification, and the electric air compressor is controlled to continue pumping air.

[0053] Step S105: When the electric air compressor meets the shutdown conditions, control the electric air compressor to the shutdown state to stop pumping air.

[0054] In one embodiment of this specification, when the electric air compressor meets the shutdown conditions, the electric air compressor is controlled to be in a shutdown state to stop pumping air.

[0055] The above technical solution monitors the gas pressure in the gas storage device. Based on the relationship between the gas pressure and the set specified pressure threshold, the starting conditions of the electric air compressor are determined to control its start-up. After the electric air compressor starts, the gas pressure in the gas storage device is monitored in real time. By using the real-time gas pressure value of the gas storage device and the brake pedal opening / closing data, the stopping conditions of the electric air compressor are determined. When the stopping conditions are met, the electric air compressor is controlled to be in a stopped state. Based on the traditional mechanical APU structure, the hardware cost of new energy vehicles is reduced. This avoids the drawback of the return pressure and cut-off pressure being within a range in the traditional mechanical APU structure, thus improving the rationality of the start-stop control of the electric air compressor.

[0056] Figure 2 This is a flowchart illustrating another start-stop control method based on an electric air compressor provided in the embodiments of this specification. It uses a conventional mechanical APU and retains the cut-off and backflushing functions of a conventional fuel-powered vehicle APU. The shut-off function does not affect the control and use of the electric air compressor. The start-stop of the electric air compressor is coordinated and controlled by monitoring instrument air pressure values, brake pedal opening signals, and the continuous operating time of the air compressor. The control flowchart is shown below. Figure 2 As shown, the air pressure in the air storage device is monitored first. This monitoring can be done at either the front or rear end. It is then determined whether the front / rear pressure is lower than a pressure threshold. This threshold is 6.5 bar when the vehicle is stationary and 7.2 bar during operation. If the front / rear pressure is not lower than the threshold, compressor start-up control is unnecessary. If the front / rear pressure is lower than the threshold, the compressor starts and begins inflation. Next, it is determined whether the pressure value during this compressor start-up cycle has exceeded the standard pressure of 8.5 bar, and whether the current pressure is not lower than the compressor start-up pressure value (7.2 bar). If not, the compressor continues to pump air and is prohibited from stopping. If so, it is determined whether the compressor's continuous operating time is greater than 130 seconds. This continuous operating time is counted from the start of the compressor operation and the attainment of the standard pressure value. If the compressor's continuous operating time is greater than 130 seconds, the compressor is allowed to stop, and it is controlled to be in a stopped state. If the air compressor runs continuously for no more than 130 seconds, check if the air pressure has ever exceeded the unloading pressure. If the air pressure has exceeded the unloading pressure, and the pressure change within 3 seconds of reaching the maximum pressure exceeds the calibrated value of 0.1 bar, and the brake pedal opening changes very little (i.e., the brake pedal hardly changes within 3 seconds), then the air compressor is allowed to stop, and the compressor is controlled to be in a stopped state. Otherwise, the air compressor continues to pump air, and stopping is prohibited.

[0057] This specification also provides an embodiment of a start-stop control device based on an electric air compressor, such as... Figure 3As shown, the device includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the above-described method.

[0058] This specification also provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured as follows:

[0059] The air pressure of the air storage device in the new energy vehicle is monitored to obtain the current air storage pressure value of the new energy vehicle. Based on the current air storage pressure value and a pre-determined specified pressure threshold, the starting conditions of the electric air compressor are verified. The specified pressure threshold is related to the current vehicle status. When the electric air compressor meets the starting conditions, it is controlled to start, and the new energy vehicle is monitored in real time to determine multiple real-time monitoring data, including the real-time air storage pressure value of the air storage device and brake pedal opening / closing data. Using these multiple real-time monitoring data, the stopping conditions of the electric air compressor are verified to determine whether the electric air compressor meets the stopping conditions. When the electric air compressor meets the stopping conditions, it is controlled to stop, thus stopping air pumping.

[0060] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the embodiments of apparatus, devices, and non-volatile computer storage media are basically similar to the method embodiments, so the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0061] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0062] The devices, media, and methods provided in the embodiments of this specification are one-to-one correspondences. Therefore, the devices and media also have similar beneficial technical effects as their corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0063] Those skilled in the art will understand that the embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this specification may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0064] This specification is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this specification. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0065] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0066] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0067] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0068] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0069] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0070] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] The above description is merely one or more embodiments of this specification and is not intended to limit this specification. Various modifications and variations can be made to the one or more embodiments of this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of one or more embodiments of this specification should be included within the scope of the claims of this specification.

Claims

1. A start-stop control method based on an electric air compressor, characterized by, The method comprises: monitoring the gas pressure of the gas storage device in the new energy vehicle to obtain a current gas storage pressure value of the new energy vehicle; verifying the start condition of the electric air compressor according to the current gas storage pressure value of the new energy vehicle and a predetermined specified pressure threshold value, wherein the specified pressure threshold value is related to the current vehicle state of the new energy vehicle; when the electric air compressor has the start condition, starting the electric air compressor and monitoring the new energy vehicle in real time to determine a plurality of real-time monitoring data, wherein the real-time monitoring data includes real-time gas storage pressure values of the gas storage device and brake pedal opening degree data; verifying the shutdown condition of the electric air compressor through the plurality of real-time monitoring data to determine whether the electric air compressor has the shutdown condition; verifying the shutdown condition of the electric air compressor includes initial shutdown verification and secondary shutdown verification, and the secondary shutdown verification specifically includes: obtaining a predetermined continuous running time threshold value; comparing a plurality of specified real-time gas storage pressure values with a standard pressure value in sequence according to collection time, when a first real-time gas storage pressure value greater than the standard pressure value exists in the specified real-time gas storage pressure values for the first time, starting timing at the collection time corresponding to the first real-time gas storage pressure value to determine the continuous running time of the electric air compressor; when the continuous running time is greater than the preset running time threshold value, determining that the electric air compressor passes the secondary shutdown verification and controlling the electric air compressor to stop to stop air charging; after determining the continuous running time of the electric air compressor, the method further comprises: when the continuous running time is not greater than the preset running time threshold value, obtaining a predetermined unloading pressure threshold value; determining an unloading state through the plurality of specified real-time gas storage pressure values and the unloading pressure threshold value, when the plurality of specified real-time gas storage pressure values are greater than the unloading pressure threshold value, determining that the unloading state is an unloading occurrence state; when the unloading state is the unloading occurrence state, determining a current unloading gradient in a specified time interval according to the plurality of specified real-time gas storage pressure values; when the current unloading gradient in the specified time interval is greater than a predetermined exhaust gradient corresponding to the exhaust device, obtaining a plurality of brake pedal opening degree data in the specified time interval and determining opening degree change data of the brake pedal in the specified time interval through the brake pedal opening degree data; when the opening degree change data of the brake pedal is not greater than a preset change threshold value, determining that the electric air compressor passes the secondary shutdown verification and controlling the electric air compressor to stop to stop air charging; In the case that the continuous running time is not greater than a preset running time threshold, when the plurality of specified real-time gas storage pressure values are not greater than the unloading pressure threshold, or when a current unloading gradient in the specified time interval is not greater than a predetermined exhaust gradient corresponding to the exhaust device, or when the opening and closing degree change data of the brake pedal is greater than a preset change threshold, it is determined that the electric air compressor fails to pass the secondary shutdown verification, and the electric air compressor is controlled to continuously charge air; When the electric air compressor has a shutdown condition, the electric air compressor is controlled to be in a shutdown state to stop charging air.

2. The method of claim 1, wherein the method further comprises: The shutdown condition of the electric air compressor is verified based on the plurality of real-time monitoring data to determine whether the electric air compressor has a shutdown condition, specifically including: Determine the gas pressure collection time of each real-time gas storage pressure value to obtain the running state of the electric air compressor corresponding to each gas pressure collection time, wherein the running state includes a start state and a shutdown state; Based on the running state of the electric air compressor corresponding to each gas pressure collection time, a plurality of specified real-time gas storage pressure values in the electric air compressor start period are selected from the real-time monitoring data to obtain a plurality of specified real-time gas storage pressure values in the electric air compressor start period; The electric air compressor is subjected to initial shutdown verification based on the specified real-time gas storage pressure values to ensure the safe operation of the new energy vehicle; When the electric air compressor passes the initial shutdown verification, the electric air compressor is subjected to secondary shutdown verification based on the plurality of real-time gas storage pressure values and the brake pedal opening and closing degree data in the plurality of real-time monitoring data; When the electric air compressor passes the secondary shutdown verification, it is determined that the electric air compressor has a shutdown condition.

3. The method of claim 2, wherein the method further comprises: The electric air compressor is subjected to initial shutdown verification based on the specified real-time gas storage pressure values, specifically including: Obtain a standard gas pressure value corresponding to the new energy vehicle and a start calibration gas pressure value of starting the engine in the electric air compressor start period; The electric air compressor is subjected to initial shutdown verification based on the plurality of specified real-time gas storage pressure values, the standard gas pressure value and the start calibration gas pressure value; When any one of the plurality of specified real-time gas storage pressure values is greater than the standard gas pressure value, and the current specified gas storage pressure value in the plurality of specified real-time gas storage pressure values is not less than the start calibration gas pressure value, it is determined that the electric air compressor passes the initial shutdown verification; When none of the plurality of specified real-time gas storage pressure values is greater than the standard gas pressure value, or the current specified gas storage pressure value in the plurality of specified real-time gas storage pressure values is less than the start calibration gas pressure value, it is determined that the electric air compressor fails to pass the initial shutdown verification, and the electric air compressor is controlled to continuously charge air.

4. The method of claim 1, wherein the method further comprises: A preset continuous running time threshold is obtained, specifically including: Determine the theoretical continuous running time of the electric air compressor, wherein the theoretical continuous running time is the running time for increasing the gas storage pressure from the standard gas pressure value to the unloading pressure threshold; The continuous operation time threshold is set according to the theoretical continuous operation time and a preset correction factor, wherein the preset correction factor is in a specified range.

5. The method of claim 1, wherein the method further comprises: After determining the continuous operation time of the electric air compressor, the method further comprises: obtaining device parameters of the gas storage device, wherein the device parameters include a gas storage device caliber and a gas storage device volume; determining the exhaust gradient through the gas storage device caliber and the gas storage device volume, wherein the exhaust gradient is positively correlated with the gas storage device caliber and negatively correlated with the gas storage device volume.

6. The method of claim 1, wherein the method further comprises: According to the current gas storage pressure value of the new energy vehicle and a predetermined specified pressure threshold, the starting condition of the electric air compressor is checked, specifically comprising: collecting current operation data of the new energy vehicle, and determining a current vehicle state of the new energy vehicle based on the current operation data, wherein the current vehicle state includes a vehicle stationary state and a vehicle driving state; determining a corresponding specified pressure threshold in a pre-set pressure threshold reference table according to the current vehicle state, wherein the pressure threshold reference table includes a plurality of vehicle states and a pressure threshold corresponding to each vehicle state; when the current vehicle state is the vehicle stationary state, a first specified pressure threshold is determined, and when the current vehicle state is the vehicle driving state, a second specified pressure threshold is determined, and the first specified pressure threshold is less than the second specified pressure threshold; when the current gas storage pressure value is less than the specified pressure threshold, it is determined that the electric air compressor has a starting condition, so as to control the electric air compressor to start to perform the air charging operation.

7. An electric motor-driven air compressor-based start-stop control device characterized by comprising: The device comprises: at least one processor; and a memory connected in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-6.

8. A non-volatile computer storage medium storing computer-executable instructions, characterized in that, The computer executable instructions are configured to perform the method of any one of claims 1-6.

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