High-voltage power-off method and device based on vehicle speed calculation fault, equipment and medium

Abstract

The invention provides a high-voltage power-off method, device and equipment based on a vehicle speed calculation fault and a medium. The method comprises the steps that in response to execution of a high-voltage power-off strategy, when a preset vehicle speed calculation fault condition is met, the high-voltage power-off strategy is executed; vehicle braking effectiveness data, vehicle zero power driving data, vehicle transmission data, power battery charging and discharging power data and vehicle static state data are obtained and obtained according to the vehicle braking effectiveness data, the vehicle zero power driving data, the vehicle transmission data and the vehicle static state data; judging the authenticity that the vehicle speed is zero under the condition that the vehicle speed calculation of the whole vehicle is invalid; if the vehicle speed is zero under the condition that the vehicle speed calculation of the whole vehicle is invalid, and other judgment conditions of high-voltage power-off are also met, the preset high-voltage power-off process is executed, so that the reliability and the safety of high-voltage power-off based on the vehicle speed calculation fault under the vehicle speed calculation fault condition are effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-voltage power-off control of a hybrid system, and in particular to a high-voltage power-off method and device based on vehicle speed calculation, an equipment and a medium. BACKGROUND

[0002] The safety of the high-voltage system of a hybrid vehicle is a key development technology for new energy vehicles at present. The frequent occurrence of spontaneous combustion of new energy vehicles is actually a safety problem of the high-voltage system. Whether it is the safety of high-voltage batteries, the safety of high-voltage charging, the safety of high-voltage power-on and power-off, or the safety of high-voltage distribution, it involves the safety of the whole vehicle and personal and property safety.

[0003] The current detection of high-voltage power-off of the whole vehicle only detects the motor speed, the vehicle speed, the power battery charge and discharge current, and the temperature of the high-voltage battery pack. If the detection conditions are met, the power-off process can be performed. However, if the conditions are not met, the high-voltage judgment time is delayed to ensure that the conditions in the above conditions are met. The high-voltage power-off safety can be confirmed by confirming that the conditions are met. However, this long waiting time delays the whole vehicle high-voltage power-off time. Long waiting time cannot fully judge the strategy and cannot fully reflect the safety of the high-voltage power-off. It cannot improve the robustness of the whole vehicle software strategy.

[0004] When executing the high-voltage power-off strategy, if the vehicle speed is not 0, but the motor speed and the engine speed are both 0, and the power battery charge and discharge current is also 0, the authenticity of the vehicle speed not being 0 needs to be fully judged. Generally, the vehicle speed is calculated using the vehicle speed signal provided by ABS (anti-lock braking system) or ESP (electronic stability system), which is calculated by loading a sensor on the wheel. Another way is to calculate the vehicle speed using an output shaft sensor loaded on the output end of the transmission. If one of the speed detection or calculation of the vehicle equipped with ABS or ESP and the output shaft sensor fails, the authenticity of the current vehicle speed calculation failure can be confirmed by referring to the other side. If it is not true, the vehicle speed calculated without failure is used as the calculation reference. If it is judged that the current vehicle speed calculation failure is true, the vehicle speed calculation method is used as the basis for high-voltage power-off judgment. For example, the vehicle speed is required to be 0 during high-voltage power-off. If the ABS calculated vehicle speed is not 0 when the vehicle is stopped, it needs to be judged whether the vehicle speed calculated by the output shaft sensor is 0. If the output shaft sensor has no failure and the calculated vehicle speed is 0, it can be judged that the ABS calculated vehicle speed is not true and not reliable. The vehicle speed calculated by the output shaft sensor is used instead of the ABS calculated vehicle speed as the basis for high-voltage power-off judgment. When the vehicle speed calculated by the output shaft sensor is not 0, the same judgment method is used.

[0005] However, when the vehicle speed sensor fails, or some low-end vehicle models do not have a matching ABS or ESP control unit, or there is only one vehicle speed calculation method as a basis, the current vehicle speed calculation method cannot be determined by two vehicle speed calculation methods, making the reliability and safety of high-voltage power-off based on vehicle speed calculation failure not high in this case.

[0006] To solve this problem, the application provides a high-voltage power-off method based on vehicle speed calculation failure, device, equipment and medium, to solve the above problems. SUMMARY

[0007] The application provides a high-voltage power-off method based on vehicle speed calculation failure, device, equipment and medium to solve the problems of low reliability and safety of high-voltage power-off based on vehicle speed calculation failure due to existing technology, effectively improving the reliability and safety of high-voltage power-off based on vehicle speed calculation failure.

[0008] The first aspect of the application provides a high-voltage power-off method based on vehicle speed calculation failure, comprising: In response to executing a high-voltage power-off strategy, when a preset vehicle speed calculation failure condition is met, obtaining vehicle braking effectiveness data, vehicle zero-power driving data, vehicle transmission data, power battery charging and discharging power data, and vehicle stationary state data; According to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle stationary state data, the authenticity of the vehicle speed being zero in the case of invalid vehicle speed calculation is determined. If the vehicle speed being zero in the case of invalid vehicle speed calculation is a true situation, and other conditions for high-voltage power-off are also met, a preset high-voltage power-off process is executed.

[0009] Optionally, the preset vehicle speed calculation failure condition includes a sensor failure for calculating vehicle speed; or, when all other conditions are met, the vehicle speed is not 0 within a preset time period during high-voltage power-off judgment; or, the vehicle model does not have an anti-lock braking system or an electronic stability system.

[0010] Optionally, the vehicle braking effectiveness data is whether a current brake system is activated, the brake system including a foot brake, a hand brake, and an EPB electronic brake; the vehicle zero-power driving data includes whether the engine speed and torque are both 0, and whether the motor speed and torque are both 0; the vehicle transmission data includes whether the gear clutch pressure transmitted to the wheels through the transmission mechanism is 0, or whether the C0 clutch pressure between the engine and the motor is 0; the power battery charging and discharging power data includes whether the current charging current and discharging current of the power battery are both 0; and the vehicle stationary state data includes whether the accelerations of the vehicle in the forward direction on the vehicle base plane, the direction between the left front wheel and the right front wheel of the vehicle, and the vertical direction of the front wheel of the vehicle are all fixed values and remain unchanged.

[0011] Further, the judging the authenticity of the vehicle speed being 0 in the case of invalid vehicle speed calculation according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle stationary state data specifically includes: If the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle stationary state data all meet the preset judgment condition, the vehicle speed being 0 in the case of invalid vehicle speed calculation belongs to a real situation; if any one of the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle stationary state data does not meet the preset judgment condition, the vehicle speed being 0 in the case of invalid vehicle speed calculation does not belong to a real situation.

[0012] Further, the preset judgment condition includes a vehicle braking effectiveness judgment condition, a vehicle zero-power driving condition, a vehicle zero-transmission condition, a power battery charging and discharging zero-power condition, and a vehicle stationary state condition; the vehicle braking effectiveness judgment condition includes a current brake system being activated; the vehicle zero-power driving condition includes the engine speed and torque being both 0, and the motor speed and torque being both 0; the vehicle zero-transmission condition includes the gear clutch pressure transmitted to the wheels through the transmission mechanism being 0, or the C0 clutch pressure between the engine and the motor being 0; the power battery charging and discharging zero-power condition includes the current charging current and discharging current of the power battery being both 0; and the vehicle stationary state condition includes the accelerations of the vehicle in the forward direction on the vehicle base plane, the direction between the left front wheel and the right front wheel of the vehicle, and the vertical direction of the front wheel of the vehicle being fixed values and remaining unchanged.

[0013] Further, the vehicle braking effectiveness data further includes a foot brake pedal opening, and the vehicle braking effectiveness judgment condition further includes the foot brake pedal opening being greater than a preset percentage threshold; and the vehicle transmission data further includes whether a limphome working condition occurs in the transmission.

[0014] Further, before judging the authenticity of the zero speed in the case of invalid vehicle speed calculation, the method further comprises the following steps of: judging whether the limphome condition occurs in the transmission, if the limphome condition occurs in the transmission, executing the high-voltage power-down method in the limphome condition, and if the limphome condition does not occur in the transmission, judging the authenticity of the zero speed in the case of invalid vehicle speed calculation according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle static state data.

[0015] The second aspect of the present application provides a high-voltage power-down device based on vehicle speed calculation failure, comprising: an acquisition module, which acquires vehicle braking effectiveness data, vehicle zero-power driving data, vehicle transmission data, power battery charging and discharging power data, and vehicle static state data in response to the execution of the high-voltage power-down strategy and the satisfaction of the preset vehicle speed calculation failure condition; a judgment module, which judges the authenticity of the zero speed in the case of invalid vehicle speed calculation according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle static state data; an execution module, which executes a preset high-voltage power-down process if the zero speed in the case of invalid vehicle speed calculation is a true case and other judgment conditions of the high-voltage power-down are also satisfied.

[0016] The third aspect of the present application provides an electronic device, comprising a memory for storing a computer program and a processor for executing the computer program to realize the high-voltage power-down method based on vehicle speed calculation failure according to the first aspect of the present application.

[0017] The fourth aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is run by a processor to execute the high-voltage power-down method based on vehicle speed calculation failure according to the first aspect of the present application.

[0018] The technical solutions adopted by the present application have the following technical effects: 1. The application responds to the execution of high-voltage power-down strategy, meets the preset vehicle speed calculation fault condition, obtains and judges the authenticity of the vehicle speed being zero under the condition of invalid vehicle speed calculation according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data; if the vehicle speed being zero under the condition of invalid vehicle speed calculation is a real situation, and other judgment conditions of high-voltage power-down are also met, the preset high-voltage power-down process is executed, effectively solving the problem of low reliability and safety of high-voltage power-down based on vehicle speed calculation fault caused by the prior art under the condition of vehicle speed calculation fault, and effectively improving the reliability and safety of high-voltage power-down based on vehicle speed calculation fault under the condition of vehicle speed calculation fault.

[0019] 2. The preset vehicle speed calculation fault condition in the technical scheme of the application includes sensor fault of calculating vehicle speed, or when executing high-voltage power-down judgment, the vehicle speed is not 0 within a preset time period under the condition that other conditions are met, or the vehicle type does not have an anti-lock braking system or an electronic stability system, which can be applied to different types of vehicle speed calculation fault conditions and improves the application range.

[0020] 3. In the technical scheme of the application, if the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data all meet the preset judgment condition, the vehicle speed being zero under the condition of invalid vehicle speed calculation is a real situation; if any one of the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data does not meet the preset judgment condition, the vehicle speed being zero under the condition of invalid vehicle speed calculation is not a real situation, further improving the reliability and safety of high-voltage power-down based on vehicle speed calculation fault under the condition of vehicle speed calculation fault.

[0021] 4. The whole vehicle braking effectiveness data in the technical scheme of the application further includes the pedal opening degree of foot brake, and the whole vehicle braking effectiveness judgment condition further includes that the pedal opening degree of foot brake is greater than a preset percentage threshold; the applicability of the whole vehicle braking effectiveness judgment condition is ensured.

[0022] 5. In the technical scheme of the application, whether the transmission appears limphome working condition is judged, if the transmission appears limphome working condition, the high-voltage power-down method under the limphome working condition is executed, if the transmission does not appear limphome working condition, the authenticity of the vehicle speed being zero under the condition of invalid vehicle speed calculation is judged according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data, and according to the working condition of the transmission, the corresponding high-voltage power-down method is selected, improving the applicability of high-voltage power-down based on vehicle speed calculation fault under the condition of vehicle speed calculation fault.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a flowchart illustrating the method of Embodiment 1 in the present invention; Figure 2 This is a schematic diagram showing the selection of the three acceleration directions (X, Y, and Z) of the vehicle in the method of Embodiment 1 of the present invention. Figure 3 This is a flowchart illustrating the limphome working condition in the method of Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of the device in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the device in Embodiment 3 of the present invention. Detailed Implementation

[0026] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure of the invention, components and arrangements of specific examples are described below. Furthermore, reference numerals and / or letters may be repeated in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. Descriptions of well-known components, processing techniques, and processes are omitted in this invention to avoid unnecessarily limiting the invention.

[0027] Example 1 like Figure 1 As shown, this invention provides a high-voltage power-off method for fault calculation based on vehicle speed, including: S1, in response to the execution of the high-voltage power-down strategy, when the preset vehicle speed calculation fault conditions are met, acquires vehicle braking effectiveness data, vehicle zero-power drive data, vehicle transmission data, power battery charging and discharging power data, and vehicle stationary state data; S2, judging whether the vehicle speed is zero in the case that the vehicle speed calculation is invalid according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle static state data; if the result is yes, executing step S3; if the result is no, executing step S5; S3, judging whether other conditions except the vehicle speed in the high-voltage shutdown judgment condition also satisfy the preset high-voltage shutdown judgment condition; if the result is yes, executing step S4; if the result is no, executing step S5; S4, executing the preset high-voltage shutdown process; S5, temporarily suspending the preset high-voltage shutdown process, and continuing to execute step S1.

[0028] In step S1, the preset vehicle speed calculation failure condition (or the vehicle speed condition not being satisfied) includes a sensor failure of calculating the vehicle speed; or, when other conditions are all satisfied, the vehicle speed condition is not 0 in a preset time period; or, the vehicle model does not have an anti-lock braking system or an electronic stability system.

[0029] When the high-voltage shutdown strategy is executed, if the vehicle speed is not 0, but the motor speed and the engine speed are both 0, and the charging and discharging current of the power battery is also 0, the authenticity of the vehicle speed not being 0 needs to be fully judged. Generally, the vehicle speed is calculated by using the vehicle speed signal provided by the ABS or the ESP, which is calculated by loading a sensor on the wheel, or by using the output shaft sensor loaded on the output end of the transmission to calculate the vehicle speed. If one of the speed detection or calculation of the vehicle with the ABS or the ESP and the output shaft sensor is problematic, the authenticity of the current vehicle speed calculation failure can be confirmed by the other party. If the current vehicle speed calculation failure is real, the vehicle speed calculation method is used as the high-voltage shutdown judgment basis. For example, the high-voltage shutdown requires the vehicle speed to be 0. If the ABS calculated vehicle speed is not 0 when the vehicle is stopped, it is necessary to judge whether the output shaft calculated vehicle speed is 0. If the output shaft sensor is not faulty and the calculated vehicle speed is 0, it can be judged that the ABS calculated vehicle speed is not real and reliable, and the output shaft sensor calculated vehicle speed is used to replace the ABS calculated vehicle speed as the high-voltage shutdown judgment basis. When the output shaft sensor calculated vehicle speed is not 0, the same judgment method is used. However, some low-config vehicles do not match the ABS or the ESP control unit, or only have one vehicle speed calculation method as the basis, so the current vehicle speed calculation method cannot be judged by two vehicle speed calculation methods. The strategy when there is only one vehicle speed judgment basis in the present application is introduced below. If the sensor for calculating the vehicle speed (for example, the output shaft sensor) reports a fault, such as sensor failure, too low or too high acceleration sensor voltage, or when performing the high pressure judgment, the vehicle speed condition is always not 0 when other conditions are met, the logic for triggering the authenticity judgment of the vehicle speed is triggered, that is, steps S2-S5 are performed.

[0030] Among them, ① judgment basis one: the whole vehicle braking effectiveness data is whether the current brake braking system is activated, the brake system includes foot brake, hand brake, EPB electronic brake; The whole vehicle braking effectiveness data also includes the pedal opening degree of the foot brake; Specifically, whether the current foot brake or hand brake or EPB electronic brake is activated, that is, whether the brake condition is met, whether the whole vehicle is in the braking process, but only relying on the brake condition cannot completely judge that the whole vehicle speed is 0, because the current may be in the braking process, the whole vehicle is braking, and the vehicle speed is slowly reducing. Further judge the braking force, judge the pedal opening degree of the foot brake greater than 60% (the first percentage threshold), the hand brake state is activated or the EPB state is activated, then the whole vehicle will quickly slow down to 0.

[0031] ② judgment basis two: the whole vehicle zero power driving data includes whether the engine speed and torque are both 0, and whether the motor speed and torque are both 0; The engine speed and torque are 0, and the motor speed and torque are 0, which truly reflects that the whole vehicle power output is 0 at this time, that is, the current whole vehicle is in the process of sliding, and under the condition that the judgment basis ① is met, the whole vehicle can be quickly braked to 0 without driving force.

[0032] ③ judgment basis three: the whole vehicle transmission data includes whether the gear clutch pressure transmitted to the wheel through the transmission mechanism is 0, or whether the C0 clutch pressure between the engine and the motor is 0; Specifically, the judgment basis three includes two zero transmission conditions, one zero transmission condition is whether the gear clutch pressure transmitted to the wheel through the transmission mechanism is 0; That is, it is necessary to judge whether the power and speed of the engine or motor is transmitted to the gear clutch pressure of the wheel through the transmission mechanism, or even whether the gear of the current transmission mechanism is empty. The clutch pressure needs to be judged. When the clutch pressure in the transmission mechanism is 0, it means that the torque and speed of the current engine or motor are not transmitted to the wheel, and the state of the whole vehicle power transmission chain can be further judged.

[0033] In addition, if some transmission will appear limphome working condition, the default gear of the transmission is fixed at a certain forward gear during limphome. For example, because the pressure of all clutches of a certain transmission is uncontrollable, the gear is uncontrollable to enter limphome. At this time, the clutch corresponding to the normal high solenoid valve is controlled to be combined. The normal high solenoid valve refers to that when the command current of the solenoid valve is 0, the clutch pressure is maximum, which is equivalent to that several clutches are combined at this time, thereby forming a certain fixed gear. Therefore, the vehicle transmission data further includes whether the transmission appears limphome working condition. Because this working condition will report a fault code, the gear formed under the limphome fault will execute a special safety home mode of the vehicle under high voltage in the HCU (hydraulic control unit) under the condition that other conditions in the present application are met. In the present application, it is not specially introduced. When limphome appears, the low voltage condition in the present application will not be met, so as to avoid affecting the safety of the vehicle under special working conditions.

[0034] Specifically, the judgment basis three further includes another zero transmission condition: whether the CO clutch pressure between the engine and the motor is 0; that is, if it can be judged that the CO clutch pressure between the engine and the motor is 0, it can be further confirmed that the power of the engine has been disconnected from the transmission system. If the hybrid driving mode before power-off is series mode, it may be series drive state or parking series generation state, or parallel drive state. A connecting mechanism is needed between the engine and the vehicle or the motor, which is replaced by CO clutch in the present application. When the hybrid driving mode before power-off is any of the above, it is necessary to judge whether the CO clutch pressure is 0. If the pressure is 0, it can be further judged that the transmission chain of the transmission mechanism has been completely disconnected.

[0035] (4) The fourth judgment basis: the power battery charge and discharge power data includes whether the current charge and discharge current of the power battery is 0; Specifically, the current charge and discharge current of the power battery is 0, because it is a judgment before the high voltage power-off (high voltage power-off) at this time, the high voltage system discharges after the high voltage is executed. Therefore, when the motor speed and torque are 0, it represents that the demand driving power of the vehicle is 0, the demand power of the power battery is 0, and the vehicle speed is 0, which represents that the vehicle is not in the sliding brake energy recovery working condition at this time, and the power battery charging power is 0. When the driver performs the power-off operation, the work of each part of the vehicle has begun to stop working, such as the electric air conditioner compressor, the electric air conditioner heater and the like, and then it is determined whether the high voltage (high voltage power-off) operation is performed. Therefore, the power demand of the air conditioner compressor or the air conditioner heater and the like to the power battery is 0.

[0036] The fifth judgment basis is whether the acceleration of the vehicle in the forward direction on the base plane, the direction between the left front wheel and the right front wheel of the vehicle, and the vertical direction of the front wheel of the vehicle are all fixed values and remain unchanged.

[0037] Specifically, the acceleration of the vehicle is judged, specifically the acceleration of the vehicle in the XYZ three directions of the vehicle, at this time the acceleration of the vehicle in the XYZ three directions can be provided by ABS or ESP, or can be provided by the engine or TCU (remote information control unit) control, etc.

[0038] As shown in Figure 2 The XYZ three directions of the vehicle are the forward direction of the vehicle on the base plane, the direction between the left front wheel and the right front wheel of the vehicle, and the vertical direction of the front wheel of the vehicle. When the XYZ three directions of the vehicle collected are fixed values and remain unchanged, it is not said that the acceleration of the three directions is actually 0, because it is related to the road surface condition according to the parking position of the vehicle. It indicates that the vehicle is not in the driving process at present, and is in the static parking state. Because if there is a vehicle speed, the slight unevenness of the road will cause the XYZ to change or fluctuate in a certain direction. But the judgment in this condition remains unchanged, a certain monitoring time needs to be added, when the acceleration of the three directions remains unchanged, the timer is triggered, when the timing time meets the requirements, generally it can be set to 500 ms, then the acceleration condition is established.

[0039] In step S2, according to the vehicle braking effectiveness data, the vehicle zero power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle static state data, the authenticity of the vehicle speed being zero in the case of invalid vehicle speed calculation is judged, specifically including: If the vehicle braking effectiveness data, the vehicle zero power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle static state data all meet the preset judgment condition, the vehicle speed being zero in the case of invalid vehicle speed calculation belongs to the true situation; if any one of the vehicle braking effectiveness data, the vehicle zero power driving data, the vehicle transmission data, the power battery charging and discharging power data, and the vehicle static state data does not meet the preset judgment condition, the vehicle speed being zero in the case of invalid vehicle speed calculation does not belong to the true situation.

[0040] Specifically, the preset judgment condition includes the vehicle braking effectiveness judgment condition ①, the vehicle zero power driving condition ②, the vehicle zero transmission condition ③, the power battery charging and discharging zero power condition ④, and the vehicle static state condition ⑤. In the vehicle braking effectiveness judgment condition ①, the current brake system is activated, that is, the brake condition satisfies that the vehicle is in the braking process, but only relying on the brake condition cannot completely judge that the vehicle speed is 0, because the vehicle may be braking and the speed is slowly reducing in the braking process. Further judging the brake intensity, judging that the pedal opening degree of the foot brake is greater than 60% (a preset percentage threshold), the hand brake state is activated or the EPB state is activated, and the vehicle will quickly slow down to 0; The vehicle zero power driving condition ② is that the engine speed and torque are 0, and the motor speed and torque are 0. The engine speed and torque are 0, and the motor speed and torque are 0. These two conditions truly reflect that the vehicle power output is 0 at this time. The vehicle is currently in the process of coasting, and the vehicle can quickly brake the speed to 0 without driving force under the condition that the judgment condition ① is satisfied. The vehicle zero transmission condition ③ is that the gear clutch pressure transmitted to the wheel through the transmission mechanism is 0, or the C0 clutch pressure between the engine and the motor is 0. One case is that the gear clutch pressure of the engine or motor power and speed transmitted to the wheel through the transmission mechanism is 0, that is, whether the current gear of the transmission mechanism is neutral also needs to judge the specific clutch pressure. When the clutch pressure in the transmission mechanism is 0, it means that the torque and speed of the current engine or motor are not transmitted to the wheel. The other case is that if the C0 clutch pressure between the engine and the motor is 0, it can be further confirmed that the power of the engine has been disconnected from the transmission system. If the hybrid driving mode before power-off is in series mode, it may be in series driving state or in parking series power generation state, or in parallel driving state, and a connecting mechanism is needed between the engine and the vehicle or the motor. In the present application, the C0 clutch is used to replace it. When the hybrid driving mode before power-off is any of the above, it is necessary to judge whether the C0 clutch is truly 0 pressure. If the pressure is 0, it can be further judged that the transmission chain of the transmission mechanism has been completely disconnected. Either of the two conditions satisfies the judgment condition.

[0041] The power battery charge-discharge zero-power condition (4) is that the current charge current and discharge current of the power battery is 0; the current charge current and discharge current of the power battery is 0, because at this time, it is before the judgment of lowering the high voltage, the high voltage system lowers the high voltage, and thus at this time, the motor speed and torque are 0, which represents that the demand driving force of the whole vehicle is 0, the demand power of the power battery is 0, and the vehicle speed is 0, which represents that the whole vehicle is not in the sliding braking energy recovery working condition at this time, and the power battery charging power is 0; and when the driver performs the lower voltage operation, the work of each part of the whole vehicle has already stopped, such as the electric air conditioner compressor, the electric air conditioner heater and the like, which are all stopped, and then it is determined whether the lower voltage operation is performed. Therefore, the power demand of the air conditioner compressor or the air conditioner heater and the like on the power battery is 0.

[0042] The whole vehicle static state condition (5) is that the acceleration of the whole vehicle in the forward direction of the automobile base plane, the direction between the left front wheel and the right front wheel of the automobile, and the vertical direction of the front wheel of the automobile is a fixed value and remains unchanged. The whole vehicle acceleration is judged, specifically, the whole vehicle acceleration in the XYZ three directions of the whole vehicle is judged, the whole vehicle XYZ three direction acceleration at this time can be provided by the ABS or the ESP, or can be provided by the engine or the TCU control, etc.; when the XYZ three direction acceleration collected by the whole vehicle is a fixed value and remains unchanged, it is not said that the three direction acceleration is actually 0, because it is related to the road surface condition of the parking position of the whole vehicle. It is indicated that the whole vehicle is not in the driving process at present, and is in the static parking state. Because if there is a vehicle speed, the slight unevenness of the road surface will cause the change or fluctuation of XYZ in a certain direction. But the judgment in this condition remains unchanged, and a certain monitoring time needs to be added, when the acceleration in the three directions remains unchanged, the timer is triggered, and when the counting time meets the requirements, it is generally set to 500 ms, and the acceleration condition is established.

[0043] Further, as shown in Figure 3 before judging the authenticity of the vehicle speed being zero in the case that the vehicle speed calculation is invalid, according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charge-discharge power data, and the whole vehicle static state data, it further includes: judging whether the limphome working condition of the transmission appears, if the limphome working condition of the transmission appears, performing the high voltage lower voltage method in the limphome working condition, if the limphome working condition of the transmission does not appear, judging the authenticity of the vehicle speed being zero in the case that the vehicle speed calculation is invalid according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charge-discharge power data, and the whole vehicle static state data.

[0044] When the conditions of ①-⑤ above are met at the same time, the authenticity of the judgment that the vehicle speed is 0 is established, which improves the authenticity and functional robustness of the judgment of the high voltage of the whole vehicle. If the other conditions of the high voltage are also met, the high voltage discharge safety and the danger of no high counter electromotive force at 0 vehicle speed are ensured, and there is no need to wait for a long time in the case where the condition judgment is not met.

[0045] In step S3, the other judgment conditions in the high voltage power-off judgment condition except the vehicle speed can be that the motor speed and the engine speed are both 0, and the charging and discharging current of the power battery is also 0, whether the preset power-off judgment condition is met, and the preset high voltage power-off process is the high voltage power-off process in the prior art, which is not limited in the embodiment.

[0046] The application fully judges the authenticity of 0 vehicle speed in the case where the vehicle speed calculation is invalid, and the feasibility of the strategy of safely executing the high voltage power-off of the whole vehicle, by the conditions of the braking effectiveness of the whole vehicle, the 0 power driving condition of the whole vehicle, the complete disconnection of the transmission system of the whole vehicle, the charging and discharging power of the power battery being 0, and the whole vehicle being in a stationary state.

[0047] The application responds to the execution of the high voltage power-off strategy, meets the preset vehicle speed calculation failure condition, acquires and judges the authenticity of the vehicle speed being 0 in the case where the vehicle speed calculation is invalid according to the braking effectiveness data of the whole vehicle, the 0 power driving data of the whole vehicle, the transmission data of the whole vehicle, the charging and discharging power data of the power battery, and the stationary state data of the whole vehicle. If the vehicle speed being 0 in the case where the vehicle speed calculation is invalid belongs to the real situation, and the other judgment conditions of the high voltage power-off are also met, the preset high voltage power-off process is executed, effectively solving the problem that the reliability and safety of the high voltage power-off based on the vehicle speed calculation failure in the case of the vehicle speed calculation failure are not high due to the prior art, and effectively improving the reliability and safety of the high voltage power-off based on the vehicle speed calculation failure in the case of the vehicle speed calculation failure.

[0048] The preset vehicle speed calculation failure condition in the technical scheme of the application includes the sensor failure of calculating the vehicle speed, or the vehicle speed condition is not 0 within the preset time period when the other conditions are met during the execution of the high voltage power-off judgment, or the vehicle type does not have an anti-lock braking system or an electronic stability system, which can be applied to different types of vehicle speed calculation failure conditions, and improves the application range.

[0049] If the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data all meet the preset judgment condition, the vehicle speed of zero under the condition that the vehicle speed calculation is invalid belongs to the real situation; if any one of the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data does not meet the preset judgment condition, the vehicle speed of zero under the condition that the vehicle speed calculation is invalid does not belong to the real situation, and the reliability and safety of the high-voltage power-off based on the vehicle speed calculation failure under the condition of the vehicle speed calculation failure are further improved.

[0050] The vehicle braking effectiveness data in the technical scheme of the application further includes the pedal opening degree of the foot brake, and the vehicle braking effectiveness judgment condition further includes that the pedal opening degree of the foot brake is greater than a preset percentage threshold; the applicability of the vehicle braking effectiveness judgment condition is ensured.

[0051] In the technical scheme of the application, it is judged whether the transmission appears the limphome working condition, if the transmission appears the limphome working condition, the high-voltage power-off method under the limphome working condition is executed, if the transmission does not appear the limphome working condition, the authenticity of the vehicle speed of zero under the condition that the vehicle speed calculation is invalid is judged according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data, and the corresponding high-voltage power-off method is selected according to the working condition of the transmission, and the applicability of the high-voltage power-off based on the vehicle speed calculation failure under the condition of the vehicle speed calculation failure is improved.

[0052] Embodiment two As shown in Figure 4 The second aspect of the application provides a high-voltage power-off device based on vehicle speed calculation failure, which comprises: An acquisition module 101 acquires vehicle braking effectiveness data, vehicle zero-power driving data, vehicle transmission data, power battery charging and discharging power data and vehicle static state data when a preset vehicle speed calculation failure condition is met in response to the execution of a high-voltage power-off strategy; A judgment module 102 judges the authenticity of the vehicle speed of zero under the condition that the vehicle speed calculation is invalid according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data; An execution module 103 executes a preset high-voltage power-off process if the vehicle speed of zero under the condition that the vehicle speed calculation is invalid belongs to the real situation and other judgment conditions of the high-voltage power-off are also met.

[0053] It should be noted that the implementation process of the acquisition module 101, the judgment module 102 and the execution module 103 corresponds to the method steps in Embodiment One, and thus will not be repeated here.

[0054] The present application responds to the execution of the high-voltage power-down strategy, and when the preset vehicle speed calculation failure condition is met, the vehicle speed of zero in the case of invalid vehicle speed calculation is judged to be real according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data. If the vehicle speed of zero in the case of invalid vehicle speed calculation is real, and other judgment conditions of high-voltage power-down are also met, the preset high-voltage power-down process is executed, effectively solving the problem of low reliability and safety of high-voltage power-down based on vehicle speed calculation failure caused by the prior art in the case of vehicle speed calculation failure, and effectively improving the reliability and safety of high-voltage power-down based on vehicle speed calculation failure in the case of vehicle speed calculation failure.

[0055] The preset vehicle speed calculation failure condition in the technical scheme of the present application includes sensor failure of calculating vehicle speed, or when other conditions are met, the vehicle speed is not 0 in a preset time period, or the vehicle type does not have an anti-lock braking system or an electronic stability system, which can be applied to different types of vehicle speed calculation failure conditions and improve the application range.

[0056] In the technical scheme of the present application, if the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data all meet the preset judgment condition, the vehicle speed of zero in the case of invalid vehicle speed calculation is real. If any one of the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data does not meet the preset judgment condition, the vehicle speed of zero in the case of invalid vehicle speed calculation is not real, further improving the reliability and safety of high-voltage power-down based on vehicle speed calculation failure in the case of vehicle speed calculation failure.

[0057] The whole vehicle braking effectiveness data in the technical scheme of the present application further includes the pedal opening degree of the foot brake, and the whole vehicle braking effectiveness judgment condition further includes that the pedal opening degree of the foot brake is greater than a preset percentage threshold, which ensures the applicability of the whole vehicle braking effectiveness judgment condition.

[0058] In the technical scheme of the present application, whether the transmission appears a limphome working condition is judged, if the transmission appears the limphome working condition, a high-voltage power-off method under the limphome working condition is executed, if the transmission does not appear the limphome working condition, the authenticity of the vehicle speed being zero under the condition that the vehicle speed calculation is invalid is judged according to the whole vehicle braking effectiveness data, the whole vehicle zero-power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data, and according to the working condition of the transmission, a corresponding high-voltage power-off method is selected, thereby improving the applicability of the high-voltage power-off based on the vehicle speed calculation fault under the vehicle speed calculation fault condition.

[0059] Embodiment three As Figure 5 shown, the third aspect of the present application provides an electronic device, comprising: a memory 201 for storing a computer program; a processor 202 for executing the computer program to realize the high-voltage power-off method based on the vehicle speed calculation fault as in embodiment one.

[0060] The memory 201 in the embodiments of the present application is used to store various types of data to support the operation of the electronic device. Examples of these data include any computer programs for operating on the electronic device. It can be understood that the memory 201 can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a ferromagnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM). The magnetic surface memory can be a magnetic disk memory or a magnetic tape memory. The volatile memory can be a random access memory (RAM) used as an external cache.By way of example and not limitation, many forms of RAM can be used, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), SyncLink Dynamic Random Access Memory (SLDRAM), Direct Rambus Random Access Memory (DRRAM). The memory 201 described in embodiments of the present application is intended to include, without being limited to, these and any other suitable types of memory.

[0061] The method disclosed by the embodiments of the present application can be applied to the processor 202 or implemented by the processor 202. The processor 202 can be an integrated circuit chip with a signal processing capability. In the implementation process, the steps of the method can be completed by an integrated logic circuit or an instruction in the form of software in the processor 202. The processor 202 can be a general processor, a DSP (Digital Signal Processing, that is, a chip capable of implementing digital signal processing technology), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 202 can implement or execute the disclosed methods, steps, and logic block diagrams in the embodiments of the present application. The general processor can be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiments of the present application, the steps can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module can be located in a storage medium, which is located in the memory 201. The processor 202 reads the program in the memory 201 and combines the hardware to complete the steps of the foregoing method. The processor 202 executes the program to implement the corresponding processes in each method of the embodiments of the present application. For brevity, details are not repeated here.

[0062] The present application responds to the execution of the high-voltage power-down strategy, meets the preset vehicle speed calculation fault condition, obtains and judges the authenticity of the vehicle speed being zero in the case of invalid vehicle speed calculation according to the whole vehicle braking effectiveness data, the whole vehicle zero-power driving data, the whole vehicle transmission data, the power battery charging and discharging power data, and the whole vehicle static state data. If the vehicle speed being zero in the case of invalid vehicle speed calculation is a real situation, and other judgment conditions of high-voltage power-down are also met, the preset high-voltage power-down process is executed, effectively solving the problem of low reliability and safety of high-voltage power-down based on vehicle speed calculation failure caused by the prior art in the case of vehicle speed calculation failure, and effectively improving the reliability and safety of high-voltage power-down based on vehicle speed calculation failure in the case of vehicle speed calculation failure.

[0063] The preset vehicle speed calculation fault condition in the technical scheme of the present application includes sensor failure of calculating vehicle speed, or when other conditions are met, the vehicle speed is not 0 in a preset time period, or the vehicle type does not have an anti-lock braking system or an electronic stability system, which can be applied to different types of vehicle speed calculation failure conditions and improve the application range.

[0064] If the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data all meet the preset judgment condition, the vehicle speed of zero under the condition that the vehicle speed calculation is invalid belongs to the true situation; if any one of the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data does not meet the preset judgment condition, the vehicle speed of zero under the condition that the vehicle speed calculation is invalid does not belong to the true situation, and the reliability and safety of the high-voltage power-off based on the vehicle speed calculation failure under the condition of the vehicle speed calculation failure are further improved.

[0065] The vehicle braking effectiveness data further includes the pedal opening degree of the foot brake, and the vehicle braking effectiveness judgment condition further includes that the pedal opening degree of the foot brake is greater than a preset percentage threshold; the applicability of the vehicle braking effectiveness judgment condition is ensured.

[0066] In the technical scheme, it is judged whether the transmission appears the limphome working condition, if the transmission appears the limphome working condition, the high-voltage power-off method under the limphome working condition is executed, if the transmission does not appear the limphome working condition, it is judged whether the vehicle speed of zero under the condition that the vehicle speed calculation is invalid is true according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data, and the corresponding high-voltage power-off method is selected according to the working condition of the transmission, and the applicability of the high-voltage power-off based on the vehicle speed calculation failure under the condition of the vehicle speed calculation failure is improved.

[0067] Embodiment four The fourth aspect of the present application provides a computer readable storage medium, and the computer readable storage medium stores a computer program, and the computer program is executed by a processor to perform the high-voltage power-off method based on the vehicle speed calculation failure according to the first aspect of the present application.

[0068] For example, the computer readable storage medium includes a memory 201 storing a computer program, and the computer program can be executed by a processor 202 to complete the steps of the foregoing method. The computer readable storage medium can be FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disc, or CD-ROM, etc.

[0069] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware, the foregoing program can be stored in a computer readable storage medium, and the program executes the steps of the above-mentioned method embodiments when executed; and the foregoing storage medium includes various storage program codes medium such as mobile storage equipment, ROM, RAM, magnetic disc or optical disc. Or, the integrated units in the application can be stored in a computer readable storage medium if the units are realized in the form of software function modules and sold or used as independent products. Based on such understanding, the technical solutions of the embodiments of the application can be embodied in the form of software products, the computer software products are stored in a storage medium, and include a plurality of instructions for making an electronic device (which can be a personal computer, a server or a network device) execute all or part of the methods described in the embodiments of the application. And the foregoing storage medium includes various storage program codes medium such as mobile storage equipment, ROM, RAM, magnetic disc or optical disc.

[0070] The application responds to the execution of the high-voltage power-down strategy, meets the preset vehicle speed calculation fault condition, obtains and judges the authenticity of the vehicle speed being zero in the case of invalid vehicle speed calculation according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data. If the vehicle speed being zero in the case of invalid vehicle speed calculation is a real situation, and other judgment conditions of high-voltage power-down are also met, the preset high-voltage power-down process is executed, effectively solving the problem of low reliability and safety of high-voltage power-down based on vehicle speed calculation failure caused by the prior art in the case of vehicle speed calculation failure, and effectively improving the reliability and safety of high-voltage power-down based on vehicle speed calculation failure in the case of vehicle speed calculation failure.

[0071] The preset vehicle speed calculation fault condition in the technical solution of the application includes sensor failure of calculating vehicle speed, or the vehicle speed is not 0 in a preset time period when other conditions are met during execution of the high-voltage power-down judgment, or the vehicle does not have an anti-lock braking system or an electronic stability system, which can be applied to different types of vehicle speed calculation failure conditions and improve the application range.

[0072] If the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data all meet the preset judgment condition, the vehicle speed of zero under the condition of invalid vehicle speed calculation is a true situation, and if any one of the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data does not meet the preset judgment condition, the vehicle speed of zero under the condition of invalid vehicle speed calculation is not a true situation, thereby further improving the reliability and safety of high voltage power-off based on vehicle speed calculation failure.

[0073] The whole vehicle braking effectiveness data further includes the pedal opening degree of the foot brake, and the whole vehicle braking effectiveness judgment condition further includes that the pedal opening degree of the foot brake is greater than a preset percentage threshold, so that the applicability of the whole vehicle braking effectiveness judgment condition is ensured.

[0074] In the technical scheme of the application, it is judged whether the transmission appears a limphome working condition, if the transmission appears the limphome working condition, the high voltage power-off method under the limphome working condition is executed, if the transmission does not appear the limphome working condition, it is judged whether the vehicle speed of zero under the condition of invalid vehicle speed calculation is true according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data and the whole vehicle static state data, and the corresponding high voltage power-off method is selected according to the working condition of the transmission, so that the applicability of high voltage power-off based on vehicle speed calculation failure is improved.

[0075] Although the specific embodiments of the application are described above with reference to the drawings, the description is not a limitation on the scope of protection of the application, and those skilled in the art should understand that various modifications or changes made on the basis of the technical scheme of the application without creative labor are still within the scope of protection of the application.

Claims

1. A method of calculating a fault under high voltage based on vehicle speed, characterized by, The application relates to a high-voltage power-off method for a vehicle. In response to executing a high-voltage power-off strategy, when a preset vehicle speed calculation fault condition is met, obtaining vehicle braking effectiveness data, vehicle zero-power driving data, vehicle transmission data, power battery charging and discharging power data and vehicle static state data; According to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data, the authenticity of the vehicle speed being zero under the condition that the vehicle speed calculation is invalid is judged. If the vehicle speed being zero under the condition that the vehicle speed calculation is invalid is a real situation, and other judgment conditions of the high-voltage power-off are also met, a preset high-voltage power-off process is executed.

2. The method of claim 1, wherein the high voltage is applied based on a vehicle speed. The preset vehicle speed calculation fault condition includes a sensor fault of calculating the vehicle speed; or when other conditions are all met, the vehicle speed is not 0 in a preset time period; or the vehicle model does not have an anti-lock braking system or an electronic stability system.

3. The method of claim 1, wherein the high voltage is applied to the engine based on the calculated fault. The vehicle braking effectiveness data is whether a current brake system is activated, the brake system including a foot brake, a hand brake and an EPB electronic brake; the vehicle zero-power driving data includes whether the rotation speed and the torque of an engine and the rotation speed and the torque of a motor are all 0; the vehicle transmission data includes whether gear clutch pressure transmitted to a wheel through a transmission mechanism or C0 clutch pressure between the engine and the motor is 0; the power battery charging and discharging power data includes whether the current charging current and the discharging current of a power battery are 0; and the vehicle static state data includes whether the acceleration of the vehicle in the forward direction of an automobile base plane, the direction between left and right front wheels of the automobile and the vertical direction of the front wheel of the automobile is a fixed value and remains unchanged.

4. The method of claim 3, wherein the high voltage is turned off based on a vehicle speed. The authenticity of the vehicle speed being zero under the condition that the vehicle speed calculation is invalid is judged according to the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data, and specifically includes: If the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data all meet preset judgment conditions, the vehicle speed being zero under the condition that the vehicle speed calculation is invalid is a real situation; if any one of the vehicle braking effectiveness data, the vehicle zero-power driving data, the vehicle transmission data, the power battery charging and discharging power data and the vehicle static state data does not meet the preset judgment conditions, the vehicle speed being zero under the condition that the vehicle speed calculation is invalid is not a real situation.

5. The method of claim 4, wherein the high voltage is turned off based on a vehicle speed. The preset judgment condition includes a whole vehicle braking effectiveness judgment condition, a whole vehicle zero power driving condition, a whole vehicle zero transmission condition, a power battery charging and discharging zero power condition, and a whole vehicle static state condition. The whole vehicle braking effectiveness judgment condition includes current brake system activation. The whole vehicle zero power driving condition is that the engine speed and torque are both 0, and the motor speed and torque are both 0. The whole vehicle zero transmission condition is that the gear clutch pressure transmitted to the wheel through the transmission mechanism is 0, or the C0 clutch pressure between the engine and the motor is 0. The power battery charging and discharging zero power condition is that the current charging and discharging currents of the power battery are 0. The whole vehicle static state condition is that the accelerations of the whole vehicle in the forward direction of the automobile base plane, the direction between the left and right front wheels of the automobile, and the vertical direction of the front wheel of the automobile are fixed values and remain unchanged.

6. The method of claim 5, wherein the high voltage is turned off based on a vehicle speed. The whole vehicle braking effectiveness data further includes the pedal opening of the foot brake, and the whole vehicle braking effectiveness judgment condition further includes that the pedal opening of the foot brake is greater than a preset percentage threshold. The whole vehicle transmission data further includes whether the transmission appears a limphome working condition.

7. The method of claim 6, wherein the high voltage is turned off based on a vehicle speed. Before judging the authenticity of the vehicle speed being 0 in the case of invalid vehicle speed calculation according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data, and the whole vehicle static state data, the method further includes: judging whether the transmission appears a limphome working condition. If the transmission appears a limphome working condition, a high-voltage power-down method in the limphome working condition is executed. If the transmission does not appear a limphome working condition, the authenticity of the vehicle speed being 0 in the case of invalid vehicle speed calculation is judged according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data, and the whole vehicle static state data.

8. A high-voltage under voltage device for calculating a fault based on vehicle speed, characterized by The method includes: an acquisition module, which acquires the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data, and the whole vehicle static state data when a preset vehicle speed calculation fault condition is met in response to the execution of the high-voltage power-down strategy; a judgment module, which judges the authenticity of the vehicle speed being 0 in the case of invalid vehicle speed calculation according to the whole vehicle braking effectiveness data, the whole vehicle zero power driving data, the whole vehicle transmission data, the power battery charging and discharging power data, and the whole vehicle static state data; an execution module, which executes a preset high-voltage power-down process if the vehicle speed being 0 in the case of invalid vehicle speed calculation is a true case and other judgment conditions of high-voltage power-down are met.

9. An electronic device, characterized by The method includes: a memory for storing a computer program; a processor for executing the computer program to implement the high-voltage power-down method based on vehicle speed calculation faults according to any one of claims 1-7.

10. A computer readable storage medium, characterized in that, The computer program is stored on the computer readable storage medium and is executed by the processor to implement the high-voltage power-down method based on vehicle speed calculation faults according to any one of claims 1-7.

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