Vehicle control method and device, vehicle and readable storage medium

Abstract

The invention discloses a vehicle control method and device, a vehicle and a readable storage medium, the vehicle comprises a vacuum pump and a vacuum pump relay connected with the vacuum pump and used for controlling the vacuum pump, and the control method comprises the steps that when the vehicle meets the condition that the vacuum pump is possibly used and the vacuum pressure of the vacuum pump is larger than or equal to a preset pressure threshold value, the vacuum pump is started; judging whether the vacuum pump has faults or not; if the vacuum pump does not have the fault, continuously sending an enable signal to the vacuum pump, and obtaining a level signal of a vacuum pump relay within a first preset time; if the level signal is a low level, the current first vacuum degree change condition of the vacuum pump is obtained; and the operation state of the vacuum pump is controlled according to the first vacuum degree change condition. According to the invention, the accuracy of fault detection of the vacuum pump is ensured, and the loss of brake assistance caused by stopping the operation of the vacuum pump due to erroneous judgment is prevented, so that the brake distance is effectively shortened, and the safety of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle control method, a vehicle control device, a vehicle, and a readable storage medium. Background Art

[0002] In the existing related technology, after the vehicle control unit sends an enable signal, the state of the vacuum pump relay is determined by obtaining the voltage value of the vacuum pump relay. However, when the vacuum pump wiring harness is not connected properly, even if the vacuum pump is capable of working, it may be misjudged as a vacuum pump relay failure because the level state of the vacuum pump relay does not match the working state of the vacuum pump, and the enable signal is stopped, causing the vacuum pump to stop running, resulting in loss of brake assist, increased braking distance, and reduced accuracy of vacuum pump fault detection and vehicle safety. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, an object of the present invention is to propose a vehicle control method, which not only ensures the accuracy of vacuum pump fault detection, but also prevents the loss of brake assist caused by stopping the vacuum pump operation due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0005] To this end, a second object of the present invention is to provide a control device for a vehicle.

[0006] To this end, a third object of the present invention is to provide a vehicle.

[0007] To this end, a fourth object of the present invention is to provide a computer-readable storage medium.

[0008] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention discloses a vehicle control method, wherein the vehicle includes a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump, and the control method includes: when the vehicle meets the conditions for possible use of the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to a preset pressure threshold, judging whether the vacuum pump has a fault; if the vacuum pump does not have a fault, continuously sending an enable signal to the vacuum pump, and obtaining a level signal of the vacuum pump relay within a first preset time; if the level signal is a low level, obtaining a current first vacuum degree change of the vacuum pump; and controlling the operating state of the vacuum pump according to the first vacuum degree change.

[0009] According to the vehicle control method of the embodiment of the present invention, when it is determined that the vehicle meets the conditions for possible use of the vacuum pump, the vacuum pressure of the vacuum pump is obtained, and after the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, it is determined whether the vacuum pump has a fault. If it is determined that the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and a level signal of the vacuum pump relay is obtained within a first preset time, so as to prevent the vacuum pump from having problems such as a wiring harness virtual connection and still being able to work, which leads to a misjudgment of the vacuum pump relay fault and affects the accuracy of the vacuum pump fault detection. When there is no fault in the vacuum pump, but the level signal of the vacuum pump relay is at a low level, the level state of the vacuum pump relay is inconsistent with the actual working state of the vacuum pump at this time, and the current first vacuum degree change of the vacuum pump is obtained to control the operation of the vacuum pump according to the first vacuum degree change, rather than directly determining the vacuum pump relay fault and controlling the vacuum pump to stop running, which not only ensures the accuracy of the vacuum pump fault detection, but also prevents the loss of brake boost caused by stopping the operation of the vacuum pump due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0010] In some embodiments, controlling the operating state of the vacuum pump according to the first vacuum degree change includes: if it is determined based on the first vacuum degree change that the vacuum degree of the vacuum pump has not changed, controlling the vacuum pump to stop running; if it is determined based on the first vacuum degree change that the vacuum degree of the vacuum pump has decreased, controlling the vacuum pump to keep running.

[0011] The above technical solution has the following advantages or beneficial effects: when it is determined that there is no fault in the vacuum pump and it is inconsistent with the level signal of the vacuum pump relay, the first vacuum degree change of the vacuum pump can be further obtained to determine whether the vacuum pump is in a real working state according to the first vacuum degree change, thereby improving the accuracy of vacuum pump fault detection, and then controlling the operating state of the vacuum pump, thereby improving the accuracy of vacuum pump operating state control.

[0012] In some embodiments, the vehicle control method further includes: if the level signal is at a high level, controlling the vacuum pump to keep running.

[0013] The above technical solution has the following advantages or beneficial effects: when there is no fault in the vacuum pump and when it is determined that the level signal of the vacuum pump relay is at a high level, that is, when it is determined that the working state of the vacuum pump is consistent with the level signal of the vacuum pump relay, the vacuum pump is controlled to keep running, thereby improving the accuracy of the control of the vacuum pump operating state.

[0014] In some embodiments, the vehicle control method also includes: if the vacuum pump fails, continuously sending an enable signal to the vacuum pump until a second preset time is reached, and obtaining a current second vacuum degree change of the vacuum pump; and controlling the operating state of the vacuum pump according to the second vacuum degree change.

[0015] The above technical solution has the following advantages or beneficial effects: the working state of the vacuum pump can be determined according to the change of the second vacuum degree, thereby improving the accuracy of vacuum pump fault detection.

[0016] In some embodiments, controlling the operating state of the vacuum pump according to the second vacuum degree change includes: if it is determined based on the second vacuum degree change that the vacuum degree of the vacuum pump has not changed, controlling the vacuum pump to stop running; if it is determined based on the second vacuum degree change that the vacuum degree of the vacuum pump has decreased, jumping to the step of continuously sending an enable signal to the vacuum pump and obtaining the level signal of the vacuum pump relay within a first preset time.

[0017] The above technical solution has the following advantages or beneficial effects: it can further detect the fault condition of the vacuum pump to solve the problem of loose connection of the wiring harness of the vacuum pump. The vacuum pump can continue to work, but the vehicle control unit mistakenly judges that the vacuum pump relay is faulty and stops sending the enable signal, causing the vacuum pump to stop working, which in turn leads to safety hazards such as loss of brake assist and increased braking distance, thereby improving the accuracy of vacuum pump fault handling.

[0018] In some embodiments, after controlling the vacuum pump to stop running, it also includes: controlling the vehicle to perform at least one of the following actions: controlling the vehicle speed not to exceed a first preset vehicle speed; increasing the braking sliding energy recovery torque; lighting up the indicator device used to indicate the vacuum pump failure.

[0019] The above technical solution has the following advantages or beneficial effects: after determining that a vacuum pump has a fault, corresponding solutions can be taken to avoid safety hazards caused by the vacuum pump fault, thereby improving vehicle safety.

[0020] In some embodiments, when at least one of the following conditions is met, it is determined that the vehicle meets the conditions for possible use of the vacuum pump, and the conditions include: the ignition switch of the vehicle is in the ON gear; the vehicle speed is greater than or equal to a second preset speed.

[0021] The above technical solution has the following advantages or beneficial effects: it can determine whether the vacuum pump needs to be used according to the state of the ignition switch and the speed of the vehicle, and then control the operating state of the vacuum pump to ensure that the vacuum pump stops running when it is not needed, thereby avoiding unnecessary energy consumption.

[0022] To achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention discloses a vehicle control device, wherein the vehicle includes a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump, and the device includes: a judgment module, used to judge whether the vacuum pump has a fault when the vehicle meets the conditions for possible use of the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to a preset pressure threshold; a first acquisition module, used to continuously send an enable signal to the vacuum pump if the vacuum pump does not have a fault, and obtain a level signal of the vacuum pump relay within a first preset time; a second acquisition module, used to obtain a current first vacuum degree change of the vacuum pump if the level signal is a low level; and a control module, used to control the operating state of the vacuum pump according to the first vacuum degree change.

[0023] According to the control device of the vehicle of the embodiment of the present invention, when the conditions for using the vacuum pump are met, the vacuum pressure of the vacuum pump is first monitored. Once the vacuum pressure is greater than or equal to the preset pressure threshold, the vacuum pump is checked for faults. If it is determined that the vacuum pump is not faulty, an enable signal is continuously sent to the vacuum pump, and the level signal of the vacuum pump relay within the first preset time is obtained to eliminate the misjudgment of relay faults caused by potential problems such as virtual connection of the wiring harness. If the vacuum pump relay level signal is low and the vacuum pump is not faulty, the operating state of the vacuum pump is flexibly adjusted by analyzing the current first vacuum degree change of the vacuum pump, rather than directly determining that the vacuum pump relay is faulty and stopping the vacuum pump. This not only ensures the accuracy of fault detection, but also avoids the loss of brake assist due to misoperation, thereby shortening the braking distance and significantly enhancing the safety of the vehicle.

[0024] To achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention discloses a vehicle, comprising: a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump; the vehicle also comprises: the vehicle control device described in the embodiment of the second aspect of the present invention; or, a processor, a memory, and a vehicle control program stored in the memory and executable on the processor, wherein the vehicle control program, when executed by the processor, implements the vehicle control method as described in any one of the embodiments of the first aspect of the present invention.

[0025] According to the vehicle of the embodiment of the present invention, when it is confirmed that the vehicle may use a vacuum pump, the vacuum pump status is accurately judged by monitoring the vacuum pressure and the vacuum pump relay level signal, thereby avoiding the loss of brake assist caused by misjudgment, ensuring accurate fault detection while preventing unnecessary safety hazards and improving the vehicle's braking performance and safety.

[0026] To achieve the above-mentioned purpose, an embodiment of the fourth aspect of the present invention discloses a computer-readable storage medium, on which a vehicle control program is stored. When the vehicle control program is executed by a processor, the vehicle control method as described in any one of the embodiments of the first aspect of the present invention is implemented.

[0027] According to the computer-readable storage medium of an embodiment of the present invention, when the vehicle control program stored thereon is executed by a processor, it can ensure that when the vehicle may use a vacuum pump, the vacuum pump status can be judged by accurately monitoring the vacuum pressure and the vacuum pump relay level signal, thereby avoiding loss of brake assist caused by misjudgment. At the same time, the vacuum pump operation can be flexibly controlled according to changes in the vacuum degree, thereby improving the accuracy of fault detection and ensuring the vehicle's braking performance and safety.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a structural block diagram of a vehicle control unit according to an embodiment of the present invention; Figure 2 is a flow chart of a vehicle control method according to an embodiment of the present invention; Figure 3 is a structural block diagram of a vehicle control device according to an embodiment of the present invention; Figure 4 is a structural block diagram of a vehicle according to an embodiment of the present invention; Figure 5 is a structural block diagram of a vehicle according to another embodiment of the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0031] In a specific embodiment of the present invention, a vehicle includes a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump.

[0032] refer to Figure 1The structural block diagram of the vehicle control unit shown in the figure, the vehicle control unit controls the vacuum pump through two relays respectively, the first relay, such as the first vacuum pump relay in the figure, can be understood as a common vacuum pump relay, and the second relay, such as the second vacuum pump relay in the figure, can be understood as a standby vacuum pump relay. When the vehicle control unit sends an enable signal, the first vacuum pump relay and the second vacuum pump relay can be powered through the interface 39 / 52, and the vehicle control unit can control the first vacuum pump relay through the low-side drive interface 118 to control the vacuum pump by controlling it to be turned on or off. Similarly, the vehicle control unit controls the third vacuum pump relay through another low-side drive interface 113 to control the vacuum pump by controlling it to be turned on or off, so that when the first vacuum pump relay fails, the second vacuum pump relay can be used as a standby relay to control the vacuum pump.

[0033] For example, after the vehicle control unit sends the enable signal, the level state of the vacuum pump relay can be obtained through the drive interface 84, for example, the voltage value of the vacuum pump relay is obtained through the brake vacuum sensor, and the vehicle control unit can determine the level state of the vacuum pump relay according to the voltage value collected, that is, high level or low level. If the vehicle control unit obtains the level state of the vacuum pump relay as a low level 1 second after sending the enable signal, it will determine that the vacuum pump relay is faulty, stop sending the enable signal, and report that the vacuum pump relay is faulty.

[0034] However, if point a of the vacuum pump wiring harness is poorly connected, although the vacuum pump can work, the vehicle control unit will mistakenly report a vacuum pump relay fault and stop generating the enable signal when it detects that the level state of the vacuum pump relay is inconsistent with the working state of the vacuum pump, causing the vacuum pump to stop failing, and further causing problems such as loss of brake assist.

[0035] Therefore, the present invention can solve the false alarm problem caused by the loose connection of the vacuum pump wiring harness, and ensure that when the vacuum pump wiring harness is loosely connected, the vehicle control unit can more accurately judge the working status of the vacuum pump, avoid unnecessary enable signal stop, thereby maintaining the normal operation of the vacuum pump and ensuring the reliability of brake assist.

[0036] Reference below Figure 2 A method for controlling a vehicle according to an embodiment of the present invention is described.

[0037] Figure 2 FIG. 1 is a flow chart of a vehicle control method according to an embodiment of the present invention. Figure 2 As shown, the control method at least includes steps S1 to S4.

[0038] Step S1, when the vehicle meets the conditions for using the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to a preset pressure threshold, it is determined whether the vacuum pump has a fault.

[0039] In the embodiment, the condition of possible use of the vacuum pump is used to characterize whether the vehicle may use the vacuum pump for auxiliary braking. When the condition of possible use of the vacuum pump is met, it is considered that the vehicle may use the vacuum pump for auxiliary braking in this scenario. Therefore, it is necessary to detect whether the operating state of the vacuum pump is normal, so as to ensure the reliability and safety of auxiliary braking. Conversely, when the condition of possible use of the vacuum pump is not met, such as when the vehicle is turned off or parked, it is considered that the vehicle does not need to use the vacuum pump for auxiliary braking in this scenario. Since the vacuum pump is not needed, there is no need to detect its operating state.

[0040] In a specific embodiment, for example, when the vehicle ignition switch is turned on or the vehicle is in a driving state and its speed is greater than a certain speed threshold (for example, 2 km / h), it can be considered that the vehicle may use a vacuum pump for auxiliary braking at this time, that is, it is considered that the vehicle's operating state meets the conditions for the possible use of the vacuum pump. At the same time, after the vacuum pump starts working, the vacuum pressure it generates is greater than or equal to the preset pressure threshold, and it can be considered that the vacuum pump meets the basic conditions for normal operation. When these two conditions are met, the vehicle control unit will further determine whether the vacuum pump has a fault to determine whether the vacuum pump is in a normal working state, and then control the sending of the enable signal according to the judgment, such as controlling the sending time of the enable signal, whether to send it continuously for a period of time or stop sending it after sending it for a period of time. In other words, the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold and it is determined whether the vacuum pump has a fault, which can become the condition for whether the enable signal is sent and its duration.

[0041] Among them, whether the vacuum pump has a fault or not can be determined based on the prompt information of the vacuum pump. For example, if the vacuum pump fault prompt information is issued, it is determined that the vacuum pump is faulty; if no fault prompt information is issued, it is determined that the vacuum pump does not have a fault.

[0042] Step S2: If there is no fault in the vacuum pump, an enable signal is continuously sent to the vacuum pump, and a level signal of the vacuum pump relay within a first preset time is obtained.

[0043] In an embodiment, if no prompt information of a vacuum pump fault is issued during the fault detection process of the vacuum pump, it is determined that there is no fault in the vacuum pump, that is, the vacuum pump can work normally, and an enable signal will be continuously sent to the vacuum pump to keep the vacuum pump running continuously, and a level signal of the vacuum pump relay within a first preset time will be obtained, wherein the level signal is, for example, a high level or a low level, and the first preset time is, for example, 1 second, that is, the level signal of the vacuum pump relay will be obtained within 1 second to determine whether the level signal of the vacuum pump relay is a high level within this 1 second. In this way, the working state of the vacuum pump relay can be judged according to the level state of the vacuum pump relay, and the working state of the vacuum pump can also be detected according to the level state of the vacuum pump relay to improve the accuracy of vacuum pump control.

[0044] Step S3: if the level signal is at a low level, obtaining the current change of the first vacuum degree of the vacuum pump.

[0045] In an embodiment, if the level signal of the vacuum pump relay is at a low level within the first preset time, the current first vacuum degree change of the vacuum pump will be further obtained to perform fault detection, because the level signal of the vacuum pump in a fault-free and normal operating state is a high-level signal. At this time, the level signal of the vacuum pump relay is inconsistent with the working state of the vacuum pump. Therefore, in order to avoid the vehicle control unit falsely reporting a vacuum relay fault when the level state of the vacuum pump relay is inconsistent with the working state of the vacuum pump, the current first vacuum degree change of the vacuum pump will be obtained to determine the fault condition of the vacuum pump relay. For example, the fault condition of the vacuum pump relay is determined based on whether the vacuum degree is reduced, so as to prevent the vacuum pump relay from being directly determined to have failed and the vacuum pump from being controlled to stop working, thereby causing safety hazards such as loss of braking assistance and increased braking distance. Therefore, the working state of the vacuum pump relay is evaluated based on whether the vacuum degree is reduced, which not only improves the accuracy and reliability of the vacuum pump diagnosis, but also ensures the safety and stability of the vehicle braking system.

[0046] Step S4, controlling the operating state of the vacuum pump according to the change of the first vacuum degree.

[0047] In an embodiment, whether the vacuum pump relay is faulty will be determined based on changes in the first vacuum pump, so that the operating state of the vacuum pump can be controlled by controlling the sending of an enable signal. In this way, when it is determined that the level signal of the vacuum pump relay is at a low level, the vehicle control unit can avoid directly determining that the vacuum pump relay is faulty and controlling the vacuum pump to stop running, which will lead to safety hazards such as loss of braking assistance and increased braking distance, thereby improving the reliability and safety of the vacuum pump.

[0048] For example, the vacuum pressure is recorded as P, the preset pressure threshold is recorded as Pon, and the first preset time is 1 second. When the vehicle is driving and its speed is greater than 2km / h, it is determined that the vehicle meets the condition that the vacuum pump may be used, that is, it is considered that the vehicle may use the vacuum pump for auxiliary braking, and if the vacuum pressure P of the vehicle at this time is greater than the preset pressure threshold Pon, that is, P>Pon, it will be determined whether the vacuum pump has a fault according to whether the vehicle control unit issues a fault reminder message. If the vehicle control unit does not issue a fault reminder message, it is determined that the vacuum pump has no fault. At this time, the vehicle control unit can continue to enable, send an enable signal to the vacuum pump, and obtain the level signal of the vacuum pump relay within 1 second. If the level signal is a low level, it is considered that the current working state of the vacuum pump is inconsistent with the level signal of the vacuum pump relay. It can also be understood that there is a virtual connection of the vacuum pump harness, but the vacuum pump can actually continue to work at this time. Therefore, it is detected that the state of the vacuum pump at this time is not the real state. In order to further determine whether the vacuum pump is in the real working state, the current first vacuum degree change of the vacuum pump will be further obtained to further diagnose the vacuum pump fault. Among them, the preset pressure threshold can be set according to specific application scenarios and equipment requirements.

[0049] Thus, the control method of the vehicle described above determines that when the vehicle meets the conditions for using the vacuum pump, the vacuum pressure of the vacuum pump is obtained. After the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, it is determined whether the vacuum pump has a fault. If it is determined that the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and the level signal of the vacuum pump relay is obtained within the first preset time, so as to prevent the vacuum pump from being misjudged when the vacuum pump can still work due to problems such as a wiring harness virtual connection, thereby affecting the accuracy of the vacuum pump fault detection. When the vacuum pump does not have a fault, but the level signal of the vacuum pump relay is at a low level, the level state of the vacuum pump relay is inconsistent with the actual working state of the vacuum pump, and the current first vacuum degree change of the vacuum pump is obtained to control the operation of the vacuum pump according to the first vacuum degree change, rather than directly determining the vacuum pump relay fault and controlling the vacuum pump to stop running, which not only ensures the accuracy of the vacuum pump fault detection, but also prevents the loss of brake assist caused by stopping the operation of the vacuum pump due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0050] In one embodiment of the present invention, the operating state of the vacuum pump is controlled according to a first vacuum degree change condition, including: if it is determined based on the first vacuum degree change condition that the vacuum degree of the vacuum pump has not changed, then controlling the vacuum pump to stop running; if it is determined based on the first vacuum degree change condition that the vacuum degree of the vacuum pump has decreased, then controlling the vacuum pump to keep running.

[0051] In the embodiment, the vacuum pressure is recorded as P, the preset pressure threshold is recorded as Pon, and the first preset time is 1 second. When the vehicle meets the conditions for possible use of the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, that is, P>Pon, it is determined whether the vacuum pump has a fault. If the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and a level signal of the vacuum pump relay is obtained within 1 second; if the level signal is low, it is considered that the vacuum pump may have a virtual connection, or the vacuum pump has a real fault again. In order to determine whether the vacuum pump is in a real operating state, the first vacuum degree change during the working process of the vacuum pump will be further obtained. If it is determined according to the first vacuum degree change that the vacuum degree of the vacuum pump has not changed, that is, the vacuum degree has not decreased, it is considered that the vacuum pump is not working effectively, that is, a real fault has occurred in the vacuum pump, and the vehicle control unit will stop sending the enable signal, thereby controlling the vacuum pump to stop running; if it is determined according to the first vacuum degree change that the vacuum degree of the vacuum pump has decreased, that is, the vacuum pump effectively performs its exhaust work, it is considered that the vacuum pump has a virtual connection, but it can actually still work normally. At this time, the vehicle control unit will continue to send an enable signal to control the vacuum pump to keep running, thereby ensuring that auxiliary braking can be provided in time.

[0052] In one embodiment of the present invention, the vehicle control method further includes: if the level signal is at a high level, controlling the vacuum pump to keep running.

[0053] In the embodiment, the vacuum pressure is recorded as P, the preset pressure threshold is recorded as Pon, and the first preset time is 1 second. When the vehicle meets the conditions for possible use of the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, that is, P>Pon, it is determined whether the vacuum pump is faulty. If the vacuum pump is not faulty, an enable signal is continuously sent to the vacuum pump, and a level signal of the vacuum pump relay is obtained within 1 second; if the level signal is high, it is considered that the vacuum pump does not have any abnormal faults including virtual connection, that is, the vacuum pump is in normal working state, and the vehicle control unit will continue to send an enable signal to the vacuum pump to maintain the continuous operation of the vacuum pump, thereby ensuring that auxiliary braking can be provided in time.

[0054] In one embodiment of the present invention, the vehicle control method also includes: if there is a fault in the vacuum pump, continuously sending an enable signal to the vacuum pump until a second preset time is reached, obtaining the current second vacuum degree change of the vacuum pump; and controlling the operating state of the vacuum pump according to the second vacuum degree change.

[0055] In the embodiment, the vacuum pressure is recorded as P, the preset pressure threshold is recorded as Pon, and the second preset time is, for example, 1 minute. When the vehicle meets the conditions for possible use of the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, that is, P>Pon, it is determined whether the vacuum pump has a fault. If it is determined that the vacuum pump has a fault (such as the vehicle control unit sends a fault reminder message), however, in order to prevent the occurrence of false detection or misjudgment of the vacuum pump fault, the vehicle control unit will not immediately stop sending the enable signal to the vacuum pump, but will continue to send the enable signal to the vacuum pump until it is equal to the second preset time. For example, the vehicle control unit continues to send the enable signal to the vacuum pump for 1 minute. After 1 minute, the vehicle control unit will obtain the current second vacuum degree change of the vacuum pump again. By comparing the vacuum degree data within 1 minute, the vehicle control unit can determine whether the vacuum degree has decreased, so as to more accurately determine whether the vacuum pump has a real fault, and then control the operation state of the vacuum pump according to the fault of the vacuum pump. For example, when the vacuum pump has a real fault, the vacuum pump is controlled to stop running. If it is determined that the vacuum pump does not have a fault, that is, a misjudgment or misdetection occurs, the vacuum pump is controlled to continue running, so as to ensure that auxiliary braking can be provided in time. Therefore, by increasing the judgment of the vacuum degree change, the accuracy of vacuum pump fault detection can be improved.

[0056] In one embodiment of the present invention, the operating state of the vacuum pump is controlled according to the second vacuum degree change, including: if it is determined based on the second vacuum degree change that the vacuum degree of the vacuum pump has not changed, then controlling the vacuum pump to stop running; if it is determined based on the second vacuum degree change that the vacuum degree of the vacuum pump is reduced, then jumping to the step of continuously sending an enable signal to the vacuum pump and obtaining the level signal of the vacuum pump relay within the first preset time.

[0057] In an embodiment, after the vehicle control unit continuously sends an enable signal to the vacuum pump for 1 minute, the vehicle control unit can determine the second vacuum degree change based on the comparison result of the vacuum degree data before and after this 1 minute. If the current vacuum degree does not change compared with the vacuum degree 1 minute ago, that is, the vacuum degree does not decrease, for example, it is consistent with the vacuum degree 1 minute ago, it is considered that the vacuum pump cannot work normally and there is a real fault, then the vehicle control unit will stop sending the enable signal to control the vacuum pump to stop running, avoid potential invalid work, and then damage the vacuum pump or increase energy consumption. On the other hand, if the current vacuum degree is compared with the vacuum degree 1 minute ago, the vacuum degree has a significant change, specifically, there is a significant decrease, in this case, it is considered that the vacuum pump has no fault, that is, there is a false detection or misjudgment in the previous fault detection, then the vehicle control unit controls the vacuum pump to keep running. In addition, continue to send the enable signal to the vacuum pump, and obtain the level signal of the vacuum pump relay within the first preset time, judge that the level signal of the vacuum pump relay is high or low, and then continue to judge the state of the vacuum pump, such as whether there will be a virtual connection of the vacuum pump harness or a real fault in the future. This can further detect the fault condition of the vacuum pump to solve the problem of loose connection of the vacuum pump wiring harness. The vacuum pump can continue to work, but the vehicle control unit mistakenly judges that the vacuum pump relay is faulty and stops sending the enable signal, causing the vacuum pump to stop working, resulting in safety hazards such as loss of brake assist and increased braking distance, thereby improving the accuracy of vacuum pump fault handling.

[0058] In one embodiment of the present invention, after controlling the vacuum pump to stop running, it also includes: controlling the vehicle to perform at least one of the following actions: controlling the vehicle speed not to exceed a first preset vehicle speed; increasing the braking sliding energy recovery torque; lighting up an indicator device for indicating a vacuum pump failure.

[0059] In an embodiment, when it is determined that the vacuum pump has a real fault, such as determining that the vacuum pump has a real fault based on the first vacuum degree change, or determining that the vacuum pump has a real fault based on the second vacuum degree change, the vehicle control unit controls the vacuum pump to stop running. At this time, the vacuum pump cannot participate in auxiliary braking, resulting in a decrease in the braking performance of the vehicle. In order to improve the braking performance of the vehicle in this case to ensure the safety and driving stability of the vehicle, in an embodiment of the present invention, the speed of the vehicle can be controlled not to exceed a first preset speed, for example, the maximum speed of the vehicle is controlled not to exceed 15km / h, so as to reduce the speed and avoid safety problems caused by the decrease in braking performance that may be caused by the failure of the vacuum pump.

[0060] On the other hand, the energy recovery strategy during braking and sliding can also be adjusted, that is, by increasing the torque when the electric motor is running as a generator, this part of the kinetic energy is converted into electrical energy and stored in the vehicle's battery, thereby increasing the energy recovery torque during braking and sliding, and partially compensating for the possible loss of braking assistance due to the cessation of the vacuum pump by improving the energy recovery efficiency, which also helps to improve the vehicle's energy efficiency.

[0061] On the other hand, the indicator device for indicating vacuum pump failure can also be lit to remind the driver of the working status of the vacuum pump at the first time, so that the driver can take necessary countermeasures in time to avoid potential safety hazards. Among them, this indicator light is usually located in a position that is easy for the driver to observe, such as on the dashboard, and uses eye-catching colors and flashing modes to remind the driver to pay attention. Once the indicator light is on, the driver can quickly identify the specific problem of the vehicle and take appropriate actions according to the vehicle's emergency guide, such as finding the nearest parking lot or parking in a safe area, and then contacting professional maintenance services.

[0062] In other words, after determining that the vacuum pump is faulty, appropriate solutions can be taken to avoid safety hazards caused by the vacuum pump failure, thereby improving vehicle driving safety.

[0063] In one embodiment of the present invention, when at least one of the following conditions is met, it is determined that the vehicle meets the conditions for possible use of the vacuum pump, the conditions including: the ignition switch of the vehicle is in the ON gear; the vehicle speed is greater than or equal to the second preset speed.

[0064] In the embodiments, reference Figure 1 As shown, the vehicle control unit can obtain the gear position of the ignition switch through the interface 50. When the ignition switch is in the ON gear, that is, the vehicle is in a state of preparing to start or running, and it is considered that a vacuum pump may be used for auxiliary braking, it is determined that the vehicle meets the conditions for possible use of a vacuum pump.

[0065] Alternatively, the ignition switch is not in the ON position, but the vehicle speed is greater than or equal to a second preset speed, the second preset speed is, for example, 2 km / h. At this time, the vehicle speed during driving is relatively high, then it is considered that a vacuum pump may be used for auxiliary braking, and it is determined that the vehicle meets the conditions for possible use of a vacuum pump.

[0066] If the ignition switch is not in the ON position, the vehicle control unit will stop sending the enable signal to the vacuum pump to control the vacuum pump to stop running, ensuring that the vacuum pump stops running when it is not needed, thereby avoiding unnecessary energy consumption.

[0067] In summary, according to the vehicle control method of the embodiment of the present invention, when it is determined that the vehicle meets the conditions for using the vacuum pump, the vacuum pressure of the vacuum pump is obtained. After the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, it is determined whether the vacuum pump has a fault. If it is determined that the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and the level signal of the vacuum pump relay is obtained within the first preset time, so as to prevent the vacuum pump from having problems such as a wiring harness virtual connection and still being able to work, which leads to a misjudgment of the vacuum pump relay fault and affects the accuracy of the vacuum pump fault detection. When there is no fault in the vacuum pump, but the level signal of the vacuum pump relay is at a low level, the level state of the vacuum pump relay is inconsistent with the actual working state of the vacuum pump at this time, and the current first vacuum degree change of the vacuum pump is obtained to control the operation of the vacuum pump according to the first vacuum degree change, rather than directly determining the vacuum pump relay fault and controlling the vacuum pump to stop running, which not only ensures the accuracy of the vacuum pump fault detection, but also prevents the loss of brake boost caused by stopping the operation of the vacuum pump due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0068] The present invention further provides a vehicle control device in an embodiment. The vehicle includes a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump.

[0069] Figure 3 1 is a block diagram of a control device for a vehicle according to an embodiment of the present invention. Figure 3 As shown, the vehicle control device 100 includes: a judgment module 110 , a first acquisition module 120 , a second acquisition module 130 and a control module 140 .

[0070] Among them, the judgment module 110 is used to judge whether there is a fault in the vacuum pump when the vehicle meets the conditions for possible use of the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold; the first acquisition module 120 is used to continuously send an enable signal to the vacuum pump if there is no fault in the vacuum pump, and obtain the level signal of the vacuum pump relay within the first preset time; the second acquisition module 130 is used to obtain the current first vacuum degree change of the vacuum pump if the level signal is at a low level; the control module 140 controls the operating state of the vacuum pump according to the first vacuum degree change.

[0071] According to the vehicle control device 100 of the embodiment of the present invention, when it is determined that the vehicle meets the conditions for using a vacuum pump, the vacuum pressure of the vacuum pump is obtained. After the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, the judgment module 110 judges whether the vacuum pump has a fault. If it is determined that the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and the level signal of the vacuum pump relay is obtained through the first acquisition module 120 within the first preset time, so as to prevent the vacuum pump from having problems such as a wiring harness virtual connection and still being able to work, which leads to a misjudgment of the vacuum pump relay fault and affects the accuracy of the vacuum pump fault detection. When there is no fault in the vacuum pump, but the level signal of the vacuum pump relay is at a low level, the level state of the vacuum pump relay is inconsistent with the actual working state of the vacuum pump, the second acquisition module 130 will obtain the current first vacuum degree change of the vacuum pump, and the control module 140 will control the operation of the vacuum pump according to the first vacuum degree change, rather than directly determining the vacuum pump relay fault and controlling the vacuum pump to stop running, which not only ensures the accuracy of the vacuum pump fault detection, but also prevents the loss of brake boost caused by stopping the vacuum pump operation due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0072] In one embodiment of the present invention, the control module 140 controls the operating state of the vacuum pump according to the first vacuum degree change condition, including: if it is determined based on the first vacuum degree change condition that the vacuum degree of the vacuum pump has not changed, then controlling the vacuum pump to stop running; if it is determined based on the first vacuum degree change condition that the vacuum degree of the vacuum pump has decreased, then controlling the vacuum pump to keep running.

[0073] In one embodiment of the present invention, the control module 140 is further configured to: if the level signal is at a high level, control the vacuum pump to keep running.

[0074] In one embodiment of the present invention, the control module 140 is also used for: if there is a fault in the vacuum pump, continuously sending an enable signal to the vacuum pump until a second preset time is reached, and obtaining the current second vacuum degree change of the vacuum pump; and controlling the operating state of the vacuum pump according to the second vacuum degree change.

[0075] In one embodiment of the present invention, the control module 140 controls the operating state of the vacuum pump according to the second vacuum degree change condition, including: if it is determined based on the second vacuum degree change condition that the vacuum degree of the vacuum pump has not changed, then controlling the vacuum pump to stop running; if it is determined based on the second vacuum degree change condition that the vacuum degree of the vacuum pump is reduced, then jumping to the step of continuously sending an enable signal to the vacuum pump and obtaining the level signal of the vacuum pump relay within the first preset time.

[0076] In one embodiment of the present invention, after controlling the vacuum pump to stop running, the control module 140 is also used to: control the vehicle to perform at least one of the following actions: control the vehicle speed not to exceed a first preset vehicle speed; increase the braking coasting energy recovery torque; light up the indicator device used to indicate a vacuum pump failure.

[0077] In one embodiment of the present invention, when at least one of the following conditions is met, it is determined that the vehicle meets the conditions for possible use of the vacuum pump, the conditions including: the ignition switch of the vehicle is in the ON gear; the vehicle speed is greater than or equal to the second preset speed.

[0078] It should be noted that when controlling the vehicle, the specific implementation method of the vehicle's control device is similar to the specific implementation method of the vehicle control method described in the above-mentioned first aspect embodiment of the present invention. Therefore, for a detailed exemplary description of the vehicle's control device, please refer to the above-mentioned description of the vehicle's control method. In order to reduce redundancy, it will not be repeated here.

[0079] According to the vehicle control device 100 of the embodiment of the present invention, when it is determined that the vehicle meets the conditions for using a vacuum pump, the vacuum pressure of the vacuum pump is obtained. After the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, the judgment module 110 judges whether the vacuum pump has a fault. If it is determined that the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and the level signal of the vacuum pump relay is obtained through the first acquisition module 120 within the first preset time, so as to prevent the vacuum pump from having problems such as a wiring harness virtual connection and still being able to work, which leads to a misjudgment of the vacuum pump relay fault and affects the accuracy of the vacuum pump fault detection. When there is no fault in the vacuum pump, but the level signal of the vacuum pump relay is at a low level, the level state of the vacuum pump relay is inconsistent with the actual working state of the vacuum pump, the second acquisition module 130 will obtain the current first vacuum degree change of the vacuum pump, and the control module 140 will control the operation of the vacuum pump according to the first vacuum degree change, rather than directly determining the vacuum pump relay fault and controlling the vacuum pump to stop running, which not only ensures the accuracy of the vacuum pump fault detection, but also prevents the loss of brake boost caused by stopping the vacuum pump operation due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0080] A further embodiment of the present invention provides a vehicle including a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump.

[0081] In some embodiments, Figure 4 As shown, the vehicle 200 according to the embodiment of the present invention includes the vehicle control device 100 as described in the above embodiment of the present invention.

[0082] In other embodiments, Figure 5As shown, the vehicle 200 includes: a processor 201, a memory 202, and a vehicle control program stored in the memory 202 and executable on the processor 201. When the vehicle control program is executed by the processor 201, a vehicle control method as described in any one of the above embodiments of the present invention is implemented.

[0083] It should be noted that when the vehicle is controlled, its specific implementation method is similar to the specific implementation method of the vehicle control device or method of any one of the above-mentioned embodiments of the present invention. Therefore, for a detailed exemplary description of the control of the vehicle, please refer to the relevant description part of the aforementioned vehicle control device or method. In order to reduce redundancy, it will not be repeated here.

[0084] According to the vehicle 200 of the embodiment of the present invention, when it is determined that the vehicle meets the conditions for possible use of the vacuum pump, the vacuum pressure of the vacuum pump is obtained. After the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, it is determined whether the vacuum pump has a fault. If it is determined that the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and a level signal of the vacuum pump relay is obtained within a first preset time, so as to prevent the vacuum pump from having problems such as a wiring harness virtual connection and still being able to work, which leads to a misjudgment of the vacuum pump relay fault and affects the accuracy of the vacuum pump fault detection. When there is no fault in the vacuum pump, but the level signal of the vacuum pump relay is at a low level, the level state of the vacuum pump relay is inconsistent with the actual working state of the vacuum pump at this time, and the current first vacuum degree change of the vacuum pump is obtained to control the operation of the vacuum pump according to the first vacuum degree change, rather than directly determining the vacuum pump relay fault and controlling the vacuum pump to stop running, which not only ensures the accuracy of the vacuum pump fault detection, but also prevents the loss of brake assist caused by stopping the operation of the vacuum pump due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0085] A further embodiment of the present invention also discloses a computer-readable storage medium, on which a vehicle control program is stored. When the vehicle control program is executed by a processor, the vehicle control method described in any one of the above embodiments of the present invention is implemented.

[0086] According to the computer-readable storage medium of the embodiment of the present invention, when the control program of the vehicle stored thereon is executed by the processor, when it is determined that the vehicle meets the conditions for possible use of the vacuum pump, the vacuum pressure of the vacuum pump is obtained, and after the vacuum pressure of the vacuum pump is greater than or equal to the preset pressure threshold, it is determined whether the vacuum pump has a fault. If it is determined that the vacuum pump does not have a fault, an enable signal is continuously sent to the vacuum pump, and the level signal of the vacuum pump relay is obtained within the first preset time, so as to prevent the vacuum pump from having problems such as a wiring harness virtual connection and still being able to work, which leads to a misjudgment of the vacuum pump relay fault and affects the accuracy of the vacuum pump fault detection. When there is no fault in the vacuum pump, but the level signal of the vacuum pump relay is at a low level, the level state of the vacuum pump relay is inconsistent with the actual working state of the vacuum pump at this time, and the current first vacuum degree change of the vacuum pump is obtained to control the operation of the vacuum pump according to the first vacuum degree change, rather than directly determining the vacuum pump relay fault and controlling the vacuum pump to stop running, which not only ensures the accuracy of the vacuum pump fault detection, but also prevents the loss of brake boost caused by stopping the vacuum pump operation due to misjudgment, thereby effectively shortening the braking distance and improving the safety of the vehicle.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0088] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vehicle control method, characterized in that: The vehicle includes a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump, and the control method includes: When the vehicle meets the conditions for possibly using the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to a preset pressure threshold, determining whether the vacuum pump has a fault; If the vacuum pump does not have a fault, continuously sending an enable signal to the vacuum pump, and obtaining a level signal of the vacuum pump relay within a first preset time; If the level signal is at a low level, obtaining a current change in the first vacuum degree of the vacuum pump; The operating state of the vacuum pump is controlled according to the change of the first vacuum degree.

2. The vehicle control method according to claim 1, characterized in that: The controlling the operating state of the vacuum pump according to the change of the first vacuum degree includes: If it is determined based on the first vacuum degree change that the vacuum degree of the vacuum pump has not changed, controlling the vacuum pump to stop running; If it is determined based on the first vacuum degree change that the vacuum degree of the vacuum pump is reduced, the vacuum pump is controlled to keep running.

3. The vehicle control method according to claim 1, characterized in that: Also includes: If the level signal is at a high level, the vacuum pump is controlled to keep running.

4. The vehicle control method according to claim 1, characterized in that: Also includes: If the vacuum pump fails, an enable signal is continuously sent to the vacuum pump until a second preset time is reached, and a current change in the second vacuum degree of the vacuum pump is obtained; The operating state of the vacuum pump is controlled according to the change of the second vacuum degree.

5. The vehicle control method according to claim 4, characterized in that: The controlling the operating state of the vacuum pump according to the change of the second vacuum degree includes: If it is determined based on the second vacuum degree change that the vacuum degree of the vacuum pump has not changed, controlling the vacuum pump to stop running; If it is determined based on the second vacuum degree change that the vacuum degree of the vacuum pump is reduced, the process jumps to the step of continuously sending an enable signal to the vacuum pump and acquiring a level signal of the vacuum pump relay within a first preset time.

6. The vehicle control method according to claim 2 or 5, characterized in that: After controlling the vacuum pump to stop running, the method further comprises: Control the vehicle to perform at least one of the following actions: Control the vehicle speed not to exceed a first preset vehicle speed; Increase the braking energy recovery torque; An indicating device for indicating a failure of the vacuum pump is illuminated.

7. The vehicle control method according to claim 1, characterized in that: When at least one of the following conditions is met, it is determined that the vehicle meets the condition that the vacuum pump may be used, the condition comprising: The ignition switch of the vehicle is in the ON position; The vehicle speed is greater than or equal to a second preset vehicle speed.

8. A vehicle control device, characterized in that: The vehicle includes a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump, and the device includes: A judgment module, configured to judge whether the vacuum pump has a fault when the vehicle meets the conditions for possibly using the vacuum pump and the vacuum pressure of the vacuum pump is greater than or equal to a preset pressure threshold; A first acquisition module, for continuously sending an enable signal to the vacuum pump if there is no fault in the vacuum pump, and acquiring a level signal of the vacuum pump relay within a first preset time; A second acquisition module, used for acquiring a current change of the first vacuum degree of the vacuum pump when the level signal is at a low level; A control module controls the operating state of the vacuum pump according to the change of the first vacuum degree.

9. A vehicle, characterized in that: include: a vacuum pump and a vacuum pump relay connected to the vacuum pump for controlling the vacuum pump; The vehicle further comprises: The vehicle control device as claimed in claim 8; or, A processor, a memory, and a vehicle control program stored in the memory and executable on the processor, wherein the vehicle control program, when executed by the processor, implements the vehicle control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a vehicle control program, and when the vehicle control program is executed by a processor, the vehicle control method according to any one of claims 1 to 7 is implemented.

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