Fault handling method and apparatus

Abstract

A fault handling method and apparatus. The fault handling method is suitable for fault detection and handling for a wastegate valve. The fault handling method comprises: acquiring fault information, a position feedback voltage and a target opening value of a wastegate valve, wherein the position feedback voltage represents the valve position of the wastegate valve; on the basis of the fault information, determining a fault type of the wastegate valve; and on the basis of the fault type, the position feedback voltage and the target opening value, determining a fault handling measure to executed for the wastegate valve.

Description

Fault handling methods and devices

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 15, 2023, with application number 202311738676.6, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of vehicle engine technology, for example, to a fault handling method and device. Background Art

[0003] The electronic wastegate valve is an important device on the turbocharger of a car engine, which can effectively prevent damage to the engine.

[0004] The electronic wastegate valve is generally driven by an H-bridge, that is, a motor. The electronic control unit (ECU) drives the connecting rod by driving the motor to control the valve at the target position. However, the relevant technology does not propose any measures to deal with the failure of the electronic wastegate valve. In addition, since the actuator of the electronic wastegate valve is not equipped with a return spring, the return spring cannot be used to deal with the failure after the electronic wastegate valve fails. The electronic wastegate valve determines the boost performance of the engine. Directly stopping the drive of the electronic wastegate valve may cause the engine to be unable to reduce power, resulting in unexpected acceleration and posing a safety hazard to the vehicle.

[0005] Summary of the Invention

[0006] The present application provides a fault handling method and device to perform different fault handling measures for different fault types of an electronic wastegate valve to ensure the safety and reliability of the vehicle.

[0007] According to one aspect of the present application, a fault handling method is provided, which is applicable to detecting and handling faults of a wastegate valve;

[0008] The fault handling method includes:

[0009] acquiring fault information, a position feedback voltage, and a target opening value of the wastegate valve, wherein the position feedback voltage represents the valve position of the wastegate valve;

[0010] determining a fault type of the wastegate valve according to the fault information;

[0011] A fault handling measure to be performed on the wastegate valve is determined according to the fault type, the position feedback voltage, and the target opening value.

[0012] Optionally, determining the fault type of the wastegate valve according to the fault information includes:

[0013] The fault information includes the voltage acquisition status of the position sensor;

[0014] The fault type is determined according to the voltage acquisition state of the position sensor, wherein the fault type includes position feedback voltage being too high and position feedback voltage being too low.

[0015] Optionally, determining a fault handling measure to be performed on the wastegate valve includes:

[0016] calculating an actual opening value of the wastegate valve according to the position feedback voltage;

[0017] If the actual opening value is greater than or equal to 100% and the duration satisfies a first duration threshold, setting the target opening value to a set value, driving the wastegate valve, and reducing a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold;

[0018] If the actual opening value is less than or equal to 0, the pulse width modulation signal for controlling the wastegate valve is reduced to a pulse width threshold.

[0019] Optionally, determining the fault type of the wastegate valve according to the fault information includes:

[0020] The fault information includes valve state parameters, wherein the valve state parameters include the valve operating state, actual opening value, boost opening threshold value and target opening value of the wastegate valve;

[0021] If the valve operation state is valve stuck, the actual opening value is greater than or equal to the boost opening threshold, and the target opening value is less than the actual opening value, then the fault type is stuck type 1;

[0022] If the valve operation state is valve stuck, the actual opening value is less than the boost opening threshold, and the target opening value is less than the actual opening value, then the fault type is stuck type 2;

[0023] If the valve operation state is valve stuck, and the target opening value is greater than the actual opening value, then the fault type is stuck type 3.

[0024] Optionally, determining a fault handling measure to be performed on the wastegate valve includes:

[0025] The fault type is stuck type 1 or stuck type 3;

[0026] reducing a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold;

[0027] The exhaust bypass valve is driven to periodically open and close in sequence using the first opening value, the second opening value, and the third opening value as execution opening values ​​to achieve the corresponding execution opening values; wherein the first opening value, the second opening value, and the third opening value are different and all belong to opening values ​​in a non-boosted state.

[0028] Optionally, determining a fault handling measure to be performed on the wastegate valve includes:

[0029] The fault type is stuck type 2;

[0030] reducing a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold;

[0031] Determining whether the vehicle meets the valve flushing condition based on the engine status and the change in boost pressure; wherein the valve flushing condition represents the characteristics of the vehicle suitable for valve flushing treatment;

[0032] If the vehicle meets the valve flushing condition, the fourth opening value and the fifth opening value are used as the execution opening values, and the exhaust bypass valve is driven to open and close periodically in sequence to achieve the corresponding execution opening value; wherein, the fourth opening value and the fifth opening value are different, and both belong to the opening values ​​under the boost state.

[0033] Optionally, determining the fault type of the wastegate valve according to the fault information includes:

[0034] The fault information includes an actual pulse width modulation signal;

[0035] Obtaining durations of a standard pulse width modulation signal and the actual pulse width modulation signal; wherein the standard pulse width modulation signal is a pulse width modulation signal when the wastegate valve reaches the target opening value under normal circumstances;

[0036] The actual pulse width modulation signal is compared with the standard pulse width modulation signal, and the duration of the actual pulse width modulation signal is compared with a second duration threshold to determine the fault type; wherein the fault type includes a valve control fault.

[0037] Optionally, determining a fault handling measure to be performed on the wastegate valve includes:

[0038] According to the standard pulse width modulation signal, the actual pulse width modulation signal is adjusted to the standard pulse width modulation signal.

[0039] Optionally, the fault handling method further includes:

[0040] A pulse width modulation signal is output according to the fault handling measure, and the wastegate valve is controlled to operate according to the pulse width modulation signal.

[0041] According to another aspect of the present application, a fault handling device is provided, comprising:

[0042] a data acquisition module configured to acquire fault information, a position feedback voltage, and a target opening value of the wastegate valve, wherein the position feedback voltage represents a valve position of the wastegate valve;

[0043] a fault type determination module, configured to determine a fault type of the wastegate valve according to the fault information;

[0044] The processing measure determination module is configured to determine a fault processing measure to be performed on the wastegate valve according to the fault type, the position feedback voltage and the target opening value.

[0045] According to another aspect of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements a fault handling method when executing the computer program.

[0046] According to another aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the fault handling method is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is a flow chart of a fault handling method according to an embodiment of the present application;

[0048] FIG2 is a flow chart of step S130 in a fault handling method according to an embodiment of the present application;

[0049] FIG3 is a flow chart of step S120 in a fault handling method according to an embodiment of the present application;

[0050] FIG4 is a flow chart of step S130 in another fault handling method provided according to an embodiment of the present application;

[0051] FIG5 is a flow chart of step S130 in another fault handling method according to an embodiment of the present application;

[0052] FIG6 is a flow chart of step S120 in another fault handling method provided according to an embodiment of the present application;

[0053] FIG7 is a flow chart of another fault handling method provided according to an embodiment of the present application;

[0054] FIG8 is a flow chart of a fault handling method according to an embodiment of the present application;

[0055] FIG9 is a schematic structural diagram of a fault handling device provided according to an embodiment of the present application;

[0056] FIG10 is a schematic structural diagram of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0057] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0058] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. The numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units listed, but may include other steps or units that are not listed or that are inherent to these processes, methods, products or devices.

[0059] An embodiment of the present application provides a fault handling method. Figure 1 is a schematic flow chart of a fault handling method provided in an embodiment of the present application. This embodiment is applicable to detecting and handling faults in the exhaust bypass valve of a vehicle engine. The method can be performed by a fault handling device, which can be implemented in hardware and / or software and can be configured in an electronic device such as a computer or server. As shown in Figure 1, the fault handling method includes the following steps.

[0060] S110 , acquiring fault information, position feedback voltage, and target opening value of the wastegate valve; wherein the position feedback voltage represents the valve position of the wastegate valve.

[0061] For example, fault information may include wastegate valve position sensor fault information, actuator fault information, and control fault information. It may also include relevant status parameters for determining the specific fault type of any of these faults. The position feedback voltage is mapped to the wastegate valve position. Therefore, the valve opening value of the wastegate valve can be determined based on the acquired position feedback voltage. The target opening value is the desired valve opening value calculated based on user operation of the vehicle and control of vehicle power; it is typically output by the boost control module in the engine's electronic control system. When the wastegate valve is operating normally, the valve will move toward the target opening value.

[0062] S120: Determine the fault type of the wastegate valve according to the fault information.

[0063] The primary direction of the wastegate valve failure can be determined based on the various specific fault information included in the fault information. The specific fault type is calculated and determined based on the relevant valve status parameters. For example, if the primary direction of the wastegate valve failure is a position sensor failure, the fault types may include position feedback voltage too high and position feedback voltage too low. If the primary direction of the wastegate valve failure is an actuator failure, the fault types may also include stuck type 1 (positive stuck at large opening), stuck type 2 (positive stuck at small opening), and stuck type 3 (negative stuck).

[0064] S130: Determine a fault handling measure to be performed on the wastegate valve according to the fault type, the position feedback voltage, and the target opening value.

[0065] For example, the actual opening value of the wastegate valve can be calculated based on the position feedback voltage and the target opening value. Based on the determined fault type, actual opening value, and target opening value, a corresponding fault handling measure can be matched, thereby determining the appropriate fault handling measure for the corresponding fault type. The fault handling method provided in the embodiments of the present application can accurately determine the type of fault occurring in the wastegate valve and, based on the specific fault type, determine and execute the corresponding fault handling measure, thereby improving the efficiency and effectiveness of fault handling and thereby enhancing vehicle safety.

[0066] The technical solution of the embodiments of the present application obtains wastegate valve fault information, position feedback voltage, and target opening value, and determines the wastegate valve fault type based on the fault information. Based on the determined fault type, position feedback voltage, and target opening value, a fault handling measure suitable for resolving the corresponding fault type can be determined to effectively resolve the wastegate valve fault. The fault handling method provided in the embodiments of the present application accurately determines the specific fault type of the wastegate valve, determines and executes appropriate fault handling measures based on the corresponding fault type, and resolves the valve fault, improving the efficiency and effectiveness of fault handling, thereby enhancing vehicle safety.

[0067] There are many types of faults that may occur in the wastegate valve. For each type of fault, corresponding fault handling measures must be determined. The following embodiments will illustrate the various types of faults and the determination of corresponding fault handling measures.

[0068] Optionally, based on the above embodiment, when a fault occurs in the position sensor of the wastegate valve, determining the fault type of the wastegate valve according to the fault information in step S120 includes the following steps.

[0069] S121. Determine a fault type based on a voltage acquisition state of the position sensor; wherein the fault type includes a position feedback voltage that is too high and a position feedback voltage that is too low.

[0070] When a position sensor fault occurs, the acquired fault information may include the position sensor voltage acquisition status. The position sensor voltage acquisition status indicates whether the system can acquire a normal position sensor position feedback voltage. For example, a normal position feedback voltage when the position sensor is not faulty may be 1 to 4V. If the acquired position feedback voltage is less than 1V, the position sensor has experienced a low position feedback voltage fault; if the acquired position feedback voltage is greater than 4V, the position sensor has experienced a high position feedback voltage fault.

[0071] Alternatively, Figure 2 is a flowchart of step S130 in a fault handling method provided in an embodiment of the present application. Based on the above embodiments, when a position sensor failure occurs in the wastegate valve, determining the fault handling measures to be performed on the wastegate valve in step S130 includes the following steps.

[0072] S131. Calculate the actual opening value of the wastegate valve based on the position feedback voltage.

[0073] Exemplarily, the actual valve opening can be calculated based on the position feedback voltage, the fully closed position voltage, and the coefficient for converting voltage to opening. The fully closed position voltage represents the voltage when the valve is in the fully closed position, i.e., the position voltage when the valve is at maximum boost pressure. The method for calculating the actual valve opening depends on the voltage characteristics of the position sensor. Exemplarily, if the position sensor's voltage characteristics indicate a low fully closed position voltage (e.g., 2V), then the smaller the valve opening, the smaller the position feedback voltage. Therefore, the actual valve opening can be calculated as follows: (position feedback voltage - fully closed position voltage) × voltage conversion coefficient. If the position sensor's voltage characteristics indicate a high fully closed position voltage (e.g., 4.5V), then the smaller the valve opening, the larger the position feedback voltage. Therefore, the actual valve opening can be calculated as follows: (fully closed position voltage - position feedback voltage) × voltage conversion coefficient. Exemplarily, the voltage conversion coefficient can be 30, but this is not a limitation.

[0074] S132: If the actual opening value is greater than or equal to 100% and the duration meets the first duration threshold, the target opening value is set to the set value, the wastegate valve is driven, and the pulse width modulation signal for controlling the wastegate valve is reduced to the pulse width threshold.

[0075] For example, for a position sensor with a voltage characteristic characterized by a high voltage at the fully closed position, when the position sensor operates normally, the position feedback voltage is within a preset range, ensuring that the actual valve opening value is between 0 and 100%. However, when the position sensor fails, that is, when the actual valve opening value is greater than or equal to 100%, the position sensor experiences a low position feedback voltage fault. Because the target opening value is less than or equal to 100%, the electronic control system will control the valve to continuously move toward the target opening value, that is, to continuously control the valve to move toward a smaller opening. The valve will gradually enter the boost zone and move toward the fully closed position. This may cause certain damage to the wastegate valve and result in unintended boost, posing a certain driving safety hazard to the vehicle.

[0076] When a position sensor failure occurs, the wastegate valve is disconnected and the pulse width modulation (PWM) signal controlling valve movement is reduced to maintain the valve in its current position. If the duration of the wastegate valve's actual valve opening being greater than or equal to 100% meets a first duration threshold, a position sensor failure is determined. For example, the first duration threshold may be 2 to 3 seconds, though this is not a limitation.

[0077] For the above position sensor failure, the following troubleshooting measures can be taken: set the target opening value to a fixed value greater than the actual opening value, and restore the drive of the valve so that the valve can move in the direction of a larger opening, and at the same time limit the PWM signal that controls the movement of the valve, that is, limit the PWM signal to a smaller value, and always limit the PWM signal until the fault is eliminated, so that the valve will not be damaged due to excessive movement speed when moving in the direction of a larger opening.

[0078] For a position sensor with a low voltage characteristic in the fully closed position, if the position sensor fails (i.e., the actual valve opening is greater than or equal to 100%), the position feedback voltage will be too high. In this case, the fault can be eliminated by taking the same troubleshooting measures as above. These troubleshooting measures are not detailed here.

[0079] S133: If the actual opening value is less than or equal to 0, reduce the pulse width modulation signal for controlling the wastegate valve to a pulse width threshold.

[0080] For example, for a position sensor whose voltage characteristic is a high voltage in the fully closed position, if the position sensor fails, that is, when the actual valve opening value is less than or equal to 0, the position sensor will experience a fault in which the position feedback voltage is too high. Because the target opening value is less than or equal to 100% and the target opening value is greater than the actual opening value, the valve continues to move in the direction of the maximum opening, that is, it remains in the non-boosted area. In this case, driving safety can be guaranteed, so it is only necessary to ensure that the valve is not damaged during the movement. Therefore, when handling this fault, it is only necessary to limit the PWM signal that controls the movement of the valve to a smaller value to ensure that the valve movement speed is slow and will not be damaged by collision due to excessive movement speed when reaching the fully open position. For example, the value for limiting the PWM signal can be a fixed value set by yourself, or it can be determined by looking up the battery voltage of the vehicle battery, and there is no limitation here.

[0081] For a position sensor with a low voltage characteristic at the fully closed position, if the position sensor fails (i.e., the actual valve opening is less than or equal to 0), the position sensor will experience a low position feedback voltage fault. In this case, the fault can be eliminated by taking the same troubleshooting measures as above. The specific troubleshooting measures are not detailed here.

[0082] The technical solution of this embodiment determines the specific fault type of the position sensor and performs different fault handling measures on the exhaust bypass valve according to different fault types, thereby protecting the exhaust bypass valve from damage while ensuring the safety of vehicle driving.

[0083] Optionally, FIG3 is a flow chart illustrating step S120 of a fault handling method provided in an embodiment of the present application. Based on the aforementioned embodiments, when an actuator failure occurs in a wastegate valve, the fault information includes valve status parameters; wherein the valve status parameters include the wastegate valve's operating state, actual opening value, boost opening threshold, and target opening value. The valve operating state may include a moving state and a stuck state; the boost opening threshold is the critical opening value for the valve to enter the boost zone. As shown in FIG3 , determining the type of wastegate valve failure based on the fault information in step S120 includes the following steps.

[0084] S122. If the valve operation state is valve stuck, the actual opening value is greater than or equal to the boost opening threshold, and the target opening value is less than the actual opening value, then the fault type is stuck type 1.

[0085] For example, when a valve is stuck, the actual valve opening is greater than or equal to the boost opening threshold, indicating that the valve is in the widest opening position. If the target opening is less than the actual opening, the valve will move from the widest opening position to the narrowest opening position, that is, from the non-boost zone to the boost zone. Therefore, this fault type is considered stuck type 1.

[0086] S123. If the valve operation state is valve stuck, the actual opening value is less than the boost opening threshold, and the target opening value is less than the actual opening value, then the fault type is stuck type 2.

[0087] For example, when a valve is stuck, the actual valve opening is less than the boost opening threshold, indicating that the valve is in the narrow opening position. If the target opening is less than the actual opening, the valve will continue to move toward the narrow opening position, from the boost zone to the fully closed position. Therefore, this fault type is considered stuck type 2.

[0088] S124. If the valve operation state is valve stuck and the target opening value is greater than the actual opening value, the fault type is stuck type 3.

[0089] For example, when the valve is in a stuck state, the target opening value is greater than the actual opening value, and the valve will continue to move from the current position to the wide-open position. Therefore, this fault type is stuck type 3.

[0090] Alternatively, FIG4 is a flowchart illustrating step S130 of another fault handling method provided in an embodiment of the present application. Based on the aforementioned embodiments, when the wastegate valve fault type is stuck type 1 or stuck type 3, as shown in FIG4 , determining the fault handling measures to be performed on the wastegate valve in step S130 includes the following steps.

[0091] S134: Reduce the pulse width modulation signal for controlling the wastegate valve to a pulse width threshold.

[0092] For example, the pulse width threshold is the critical value of the PWM signal that protects the valve from damage. When a valve is stuck, a valve flushing action is typically performed to eliminate the problem. During this action, the PWM signal controlling valve movement must be limited to a certain pulse width threshold to protect the valve from damage.

[0093] S135. Using the first opening value, the second opening value, and the third opening value as execution opening values, the exhaust bypass valve is driven to open and close periodically in sequence to achieve the corresponding execution opening values; wherein the first opening value, the second opening value, and the third opening value are different and all belong to opening values ​​in a non-boosted state.

[0094] For example, due to both stuck type 1 and stuck type 3 faults, the valve becomes stuck in the fully opened position or while moving toward the fully opened position. Therefore, the valve is controlled to perform a valve flushing action in the non-boosting zone to eliminate the stuck fault. Because the opening range in the non-boosting zone is larger than that in the boosting zone, multiple target opening values ​​are set within the non-boosting zone as target opening values ​​when performing the valve flushing action. For example, the number of target opening values ​​can be three, four, or five, etc., without limitation. In this embodiment, three target opening values ​​are set as an example. The three target opening values ​​are a first, second, and third value, and each of the three target opening values ​​is different. The valve is driven to move sequentially to each of the three set target opening values. Upon reaching one of the target opening values, the valve is controlled to retract toward a smaller opening, then move again to the next target opening value, and then retract toward a smaller opening. This controlled valve periodically reciprocates to achieve the valve flushing effect. Controlling the valve to move to three execution opening value positions in sequence is one cycle, and multiple cycles can be executed to eliminate the sticking fault.

[0095] Alternatively, FIG5 is a flowchart illustrating step S130 of another fault handling method provided in an embodiment of the present application. Based on the aforementioned embodiments, when the wastegate valve fault type is stuck type 2, as shown in FIG5 , determining the fault handling measures to be performed on the wastegate valve in step S130 includes the following steps.

[0096] S136: Reduce the pulse width modulation signal for controlling the wastegate valve to a pulse width threshold.

[0097] For example, the PWM signal for controlling the valve is limited to a pulse width threshold value to protect the valve from being damaged when the valve flushing measure is performed.

[0098] S137. Determine whether the vehicle meets the valve flushing condition based on the engine state and the change in boost pressure; wherein the valve flushing condition represents the characteristics of the vehicle that are suitable for valve flushing treatment.

[0099] For example, when a wastegate valve is stuck, type 2, the vehicle must be assessed to determine whether it meets the conditions for performing a valve flushing action to ensure vehicle safety and reliability. Exemplarily, the valve flushing condition requires the vehicle to be stopped or stationary, and valve movement will not increase the actual boost pressure in the supercharging system. This means the vehicle can be operating at low engine speed and load, and valve movement will not cause boost pressure fluctuations. For example, for a conventional gasoline vehicle, the valve flushing condition may be met when the engine is idling, non-boosted, and the accelerator pedal position is zero. For a hybrid vehicle, the valve flushing condition may be met when the requested torque is less than a torque threshold and the idle charging speed is less than a second speed threshold. The first speed threshold, second speed threshold, and torque threshold can all be set by the user based on actual circumstances and are not limited here. When the vehicle meets these conditions, the wastegate valve can be flushed to resolve the valve sticking problem.

[0100] S138. If the vehicle meets the valve flushing condition, the fourth opening value and the fifth opening value are used as the execution opening values, and the exhaust bypass valve is driven to open and close periodically in sequence to achieve the corresponding execution opening value; wherein the fourth opening value and the fifth opening value are different and both belong to the opening values ​​under the boost state.

[0101] For example, since a stuck type 2 fault is caused by the valve continuing to move from a small opening position toward a smaller opening, the valve may be subjected to a valve flushing measure in the boost zone. The boost zone is smaller than the non-boost zone. Therefore, a smaller number of target opening values ​​is set within the boost zone's opening range as the target opening value when performing the valve flushing measure. For example, the set data for the target opening values ​​can be one or two, but this is not a limitation. In this embodiment, two target opening values ​​are set as an example. The two target opening values ​​are set to the fourth and fifth opening values, and each of the two target opening values ​​is different. The valve is driven to move sequentially to the two set target opening values. Upon reaching one of the target opening values, the valve is controlled to retract toward a wider opening, then moved again to the next target opening value, and then retracted toward a wider opening. This controlled valve reciprocating motion cycle is repeated to achieve the valve flushing effect. Sequentially controlling the valve to move to the two target opening values ​​constitutes a cycle, and multiple cycles can be performed to eliminate the stuck fault.

[0102] The technical solution of this embodiment determines the specific fault type of the valve sticking fault, determines appropriate fault handling measures according to the corresponding fault type, and executes valve flushing measures to solve the valve sticking fault while ensuring the safety of the valve and the vehicle, thereby improving the efficiency and effectiveness of fault handling.

[0103] Alternatively, FIG6 is a flowchart illustrating step S120 of another fault handling method provided in an embodiment of the present application. Based on the aforementioned embodiments, when a wastegate valve control fault occurs, the fault information includes an actual pulse width modulation signal. As shown in FIG6 , determining the type of wastegate valve fault based on the fault information in step S120 includes the following steps.

[0104] S125. Obtain durations of a standard pulse width modulation signal and an actual pulse width modulation signal; wherein the standard pulse width modulation signal is a pulse width modulation signal when the wastegate valve reaches a target opening value under normal circumstances.

[0105] The standard PWM signal is the PWM signal required to achieve the target valve opening when the valve is not faulty, while the actual PWM signal is the PWM signal actually required to achieve the target valve opening when the valve is faulty. The duration of the actual PWM signal can be used to determine whether a valve control fault has occurred, preventing misjudgment of a fault.

[0106] S126. Compare the actual pulse width modulation signal with the standard pulse width modulation signal, and compare the duration of the actual pulse width modulation signal with a second duration threshold to determine the fault type; wherein the fault type includes a valve control fault.

[0107] For example, when a wastegate valve control fault occurs, the actual PWM signal will be greater than the standard PWM signal; that is, the valve requires a greater output force to reach the target opening value. A valve control fault is only determined when the actual PWM signal persists for a duration greater than or equal to a second duration threshold. For example, the second duration threshold can be 3 to 5 seconds, which is not a limitation. If the actual PWM signal persists for less than the second duration threshold, it may be a false detection, and the valve control fault is not present.

[0108] Optionally, based on the above embodiments, when a valve control failure occurs in the wastegate valve, determining the fault handling measures to be performed on the wastegate valve in step S130 includes the following steps.

[0109] S139: According to the standard pulse width modulation signal, the actual pulse width modulation signal is adjusted to the standard pulse width modulation signal.

[0110] For example, when a control failure occurs in the valve, it is only necessary to adjust the actual PWM signal to be the same as the standard PWM signal, that is, to control the duty cycle of the actual PWM signal to exceed the limit. At this time, the valve can still reach the target opening value.

[0111] The technical solution of this embodiment determines whether a wastegate valve control fault has occurred based on the duration of the actual PWM signal and the standard PWM signal. If a valve control fault is determined to have occurred, the actual PWM signal is adjusted to the standard PWM signal to eliminate the control fault.

[0112] Optionally, FIG7 is a flowchart of another fault handling method provided in an embodiment of the present application. Based on the above multiple embodiments, as shown in FIG7, the fault handling method further includes:

[0113] S140: Output a pulse width modulation signal according to the fault handling measure, and control the exhaust gas bypass valve to operate with the pulse width modulation signal.

[0114] For example, after determining corresponding fault handling measures according to different fault types of the wastegate valve, a PWM signal is output according to the corresponding fault handling measures, and the valve movement is controlled according to the PWM signal, thereby eliminating the fault.

[0115] The technical solution of this embodiment controls the movement of the wastegate valve according to the output PWM signal based on the determined corresponding fault handling measures, thereby eliminating the fault and improving the safety and reliability of the vehicle.

[0116] In one achievable embodiment, FIG8 is a flowchart of a fault handling method provided in an embodiment of the present application. Based on the above embodiments, as shown in FIG8 , the fault handling method includes the following steps.

[0117] S1. Start.

[0118] S2. Determine whether the valve position sensor fails; if so, proceed to step S3; if not, proceed to step S8.

[0119] S3. Determine whether the voltage at the fully closed position of the valve is a large voltage; if so, proceed to step S4; if not, proceed to step S7.

[0120] S4. Determine whether the valve fault type is low voltage of the position sensor; if so, proceed to step S5; if not, proceed to step S6.

[0121] S5. Execute troubleshooting measure 1.

[0122] S6. Execute troubleshooting measure 2.

[0123] S7. Determine whether the valve fault type is that the position sensor voltage is too high; if so, proceed to step S5; if not, proceed to step S6.

[0124] S8. Determine whether the valve actuator fails; if so, proceed to step S9; if not, proceed to step S14.

[0125] S9. Determine whether the valve fault type is stuck type 1; if so, proceed to step S10; if not, proceed to step S11.

[0126] S10. Execute the jam type 1 handling measures.

[0127] S11. Determine whether the valve fault type is stuck type 2; if so, proceed to step S12; if not, proceed to step S13.

[0128] S12. Execute the jam type 2 handling measures.

[0129] S13. The valve failure type is stuck type 3.

[0130] S14. Execute the jam type 3 handling measures.

[0131] S15. Determine whether a control failure occurs in the valve; if so, proceed to step S16; if not, proceed to step S2.

[0132] S16. Execute valve control fault handling measures.

[0133] S17, end.

[0134] Fault handling measure 1 involves disconnecting the wastegate valve and limiting the PWM signal controlling valve movement to a smaller value until the fault disappears; setting the target opening value to a fixed value greater than the actual opening value and resuming valve actuation; and fault handling measure 2 involves limiting the PWM signal controlling valve movement to a smaller value. For example, the PWM signal limiting value can be a fixed value or determined by looking up the vehicle battery voltage in a table.

[0135] The present application also provides a fault handling device. FIG9 is a schematic diagram of the structure of a fault handling device provided in the present application. As shown in FIG9, the fault handling device 100 includes:

[0136] The data acquisition module 101 is configured to acquire fault information, position feedback voltage, and target opening value of the wastegate valve; wherein the position feedback voltage represents the valve position of the wastegate valve;

[0137] a fault type determination module 102 configured to determine a fault type of the wastegate valve based on the fault information;

[0138] The treatment measure determination module 103 is configured to determine a fault treatment measure to be performed on the wastegate valve according to the fault type, the position feedback voltage and the target opening value.

[0139] The fault handling device provided in the embodiments of the present application can execute the fault handling method provided in any embodiment of the present application, and possesses the functional modules and effects corresponding to the execution of the method. For example, the data acquisition module 101 acquires fault information, position feedback voltage, and target opening value of the wastegate valve. The fault type determination module 102 determines the fault type of the wastegate valve based on the fault information. Based on the determined fault type, position feedback voltage, and target opening value, the treatment measure determination module 103 determines a fault treatment measure appropriate for the corresponding fault type, thereby effectively resolving the wastegate valve fault.

[0140] Optionally, based on the above embodiments, the fault information includes the voltage acquisition status of the position sensor, and the fault type determination module 102 includes:

[0141] The first fault type determination unit is configured to determine the fault type according to the voltage acquisition state of the position sensor; wherein the fault types include position feedback voltage being too high and position feedback voltage being too low.

[0142] Optionally, based on the above embodiments, the treatment measure determination module 103 includes:

[0143] an actual opening calculation unit configured to calculate an actual opening value of the wastegate valve based on a position feedback voltage;

[0144] a first processing measure determination unit configured to set the target opening value to a set value, drive the wastegate valve, and reduce the pulse width modulation signal for controlling the wastegate valve to a pulse width threshold if the actual opening value is greater than or equal to 100% and the duration of the opening meets a first duration threshold;

[0145] The second processing measure determination unit is configured to reduce the pulse width modulation signal for controlling the wastegate valve to a pulse width threshold if the actual opening value is less than or equal to 0.

[0146] Optionally, based on the above embodiments, the fault information includes valve status parameters; wherein the valve status parameters include the valve operating state, actual opening value, boost opening threshold value, and target opening value of the wastegate valve; the fault type determination module 102 includes:

[0147] The second fault type determination unit is configured to determine that if the valve operation state is valve stuck, the actual opening value is greater than or equal to the boost opening threshold, and the target opening value is less than the actual opening value, the fault type is stuck type 1;

[0148] a third fault type determination unit configured to determine that if the valve operation state is valve stuck, the actual opening value is less than the boost opening threshold, and the target opening value is less than the actual opening value, the fault type is stuck type 2;

[0149] The fourth fault type determination unit is configured to determine that if the valve operation state is valve stuck and the target opening value is greater than the actual opening value, the fault type is stuck type 3.

[0150] Optionally, based on the above embodiments, the fault type is stuck type 1 or stuck type 3; the processing measure determination module 103 includes:

[0151] a first signal conditioning unit configured to reduce a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold;

[0152] The third processing measure determination unit is configured to use the first opening value, the second opening value and the third opening value as the execution opening value, and to drive the exhaust gas bypass valve to periodically open and close in sequence to achieve the corresponding execution opening value; wherein the first opening value, the second opening value and the third opening value are different, and all belong to the opening values ​​under the non-boost state.

[0153] Optionally, based on the above embodiments, the fault type is stuck type 2; the processing measure determination module 103 includes:

[0154] a second signal conditioning unit configured to reduce a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold;

[0155] a condition judgment unit configured to judge whether the vehicle meets a valve flushing condition based on an engine state and a change in boost pressure; wherein the valve flushing condition represents a feature of the vehicle suitable for valve flushing treatment;

[0156] The fourth processing measure determination unit is configured to use the fourth opening value and the fifth opening value as the execution opening value if the vehicle meets the valve flushing condition, and drive the exhaust gas bypass valve to periodically open and close in sequence to achieve the corresponding execution opening value; wherein the fourth opening value and the fifth opening value are different, and both belong to the opening values ​​under the boost state.

[0157] Optionally, based on the above embodiments, the fault information includes an actual pulse width modulation signal; the fault type determination module 102 includes:

[0158] a signal acquisition unit configured to acquire a standard pulse width modulation signal and a duration of an actual pulse width modulation signal; wherein the standard pulse width modulation signal is a pulse width modulation signal when the wastegate valve reaches a target opening value under normal circumstances;

[0159] The fifth fault type determination unit is configured to compare the actual pulse width modulation signal with the standard pulse width modulation signal, and compare the duration of the actual pulse width modulation signal with the second duration threshold to determine the fault type; wherein the fault type includes valve control fault.

[0160] Optionally, based on the above embodiments, the treatment measure determination module 103 includes:

[0161] The fifth processing measure determination unit is configured to adjust the actual pulse width modulation signal to the standard pulse width modulation signal according to the standard pulse width modulation signal.

[0162] Optionally, based on the above embodiments, the fault handling device 100 further includes:

[0163] The fault processing module is configured to output a pulse width modulation signal according to the fault processing measure, and control the exhaust bypass valve to operate with the pulse width modulation signal.

[0164] An embodiment of the present application also provides an electronic device. Figure 10 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital assistants, cellular phones, smart phones, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or claimed herein.

[0165] As shown in Figure 10, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by the at least one processor 11, and the processor 11 can perform a variety of appropriate actions and processes according to the computer program stored in the ROM 12 or the computer program loaded from the storage unit 18 into the RAM 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, ROM 12 and RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0166] Multiple components in the electronic device 10 are connected to the I / O interface 15, including an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a magnetic disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0167] The processor 11 can be a variety of general-purpose and / or specialized processing components with processing and computing capabilities. Some examples of the processor 11 include a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors that run machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the fault handling method.

[0168] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements a fault handling method when executed by a processor.

[0169] In some embodiments, the fault handling method may be implemented as a computer program that is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the fault handling method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the fault handling method in any other appropriate manner (e.g., by means of firmware).

[0170] In the context of the present application, computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage medium can include electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage medium can be a machine-readable signal medium. Machine-readable storage medium includes an electrical connection based on one or more lines, a portable computer disk, a hard disk, RAM, ROM, erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device or any suitable combination of the foregoing. Storage medium can be a non-transitory storage medium.

[0171] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with embodiments of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0172] A computing system may include a client and a server. The client and server are generally remote from each other and typically interact via a communication network. The client-server relationship arises through computer programs running on the respective computers and establishing a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, a host product within a cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosts and virtual private server (VPS) services.

[0173] The various forms of processes shown above can be used to reorder, add, or delete steps. For example, the multiple steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This document is not limited here.

[0174] The above embodiments do not limit the scope of protection of this application. Various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors.

Claims

1. A fault handling method, suitable for detecting and handling faults of a wastegate valve; The fault handling method comprises: Acquiring fault information, position feedback voltage and target opening value of the wastegate valve, wherein the position feedback voltage represents the valve position of the wastegate valve; determining a fault type of the wastegate valve according to the fault information; A fault handling measure to be performed on the wastegate valve is determined according to the fault type, the position feedback voltage and the target opening value.

2. The method according to claim 1, wherein: Determining the fault type of the wastegate valve according to the fault information includes: The fault information includes the voltage acquisition status of the position sensor; The fault type is determined according to the voltage acquisition state of the position sensor, wherein the fault type includes a position feedback voltage that is too high and a position feedback voltage that is too low.

3. The method according to claim 2, wherein: The determining of the fault handling measures to be performed on the wastegate valve includes: calculating an actual opening value of the wastegate valve according to the position feedback voltage; In response to the actual opening value being greater than or equal to 100% and the duration meeting a first duration threshold, setting the target opening value to a set value, driving the wastegate valve, and reducing a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold; In response to the actual opening value being less than or equal to 0, a pulse width modulation signal for controlling the wastegate valve is reduced to a pulse width threshold.

4. The method according to claim 1, wherein: Determining the fault type of the wastegate valve according to the fault information includes: The fault information includes valve state parameters, wherein the valve state parameters include the valve operation state, actual opening value, boost opening threshold value and target opening value of the wastegate valve; In response to the valve operation state being valve stuck, the actual opening value being greater than or equal to the boost opening threshold, and the target opening value being less than the actual opening value, the fault type is stuck type 1; In response to the valve operation state being valve stuck, the actual opening value being less than the boost opening threshold, and the target opening value being less than the actual opening value, the fault type is stuck type 2; In response to the valve operating state being valve stuck, the target opening value is greater than the actual opening value, and the fault type is stuck type 3.

5. The method according to claim 4, wherein: The determining of the fault handling measures to be performed on the wastegate valve includes: The fault type is the stuck type 1 or the stuck type 3; reducing a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold; The first opening value, the second opening value and the third opening value are used as the execution opening values, and the exhaust bypass valve is driven to open and close periodically in sequence to achieve the corresponding execution opening value, wherein the first opening value, the second opening value and the third opening value are different and all belong to the opening values ​​under the non-boost state.

6. The method according to claim 4, wherein: The determining of the fault handling measures to be performed on the wastegate valve includes: The fault type is the stuck type 2; reducing a pulse width modulation signal for controlling the wastegate valve to a pulse width threshold; According to the engine state and the change of the boost pressure, judging whether the vehicle meets the valve flushing condition, wherein the valve flushing condition represents the characteristics of the vehicle suitable for the valve flushing treatment; In response to the vehicle satisfying the valve flushing condition, the fourth opening value and the fifth opening value are used as the execution opening values, and the exhaust bypass valve is driven to open and close periodically in sequence to achieve the corresponding execution opening value; wherein the fourth opening value and the fifth opening value are different, and both belong to the opening values ​​under the boost state.

7. The method according to claim 1, wherein: Determining the fault type of the wastegate valve according to the fault information includes: The fault information includes an actual pulse width modulation signal; Acquiring the duration of a standard pulse width modulation signal and the actual pulse width modulation signal, wherein the standard pulse width modulation signal is a pulse width modulation signal when the wastegate valve reaches the target opening value under normal circumstances; The actual pulse width modulation signal is compared with the standard pulse width modulation signal, and the duration of the actual pulse width modulation signal is compared with a second duration threshold to determine the fault type; wherein the fault type includes a valve control fault.

8. The method according to claim 7, wherein: The determining of the fault handling measures to be performed on the wastegate valve includes: According to the standard pulse width modulation signal, the actual pulse width modulation signal is adjusted to the standard pulse width modulation signal.

9. The method according to claim 1, further comprising: A pulse width modulation signal is output according to the fault handling measure, and the wastegate valve is controlled to operate with the pulse width modulation signal.

10. A fault handling device, comprising: A data acquisition module, configured to acquire fault information, a position feedback voltage and a target opening value of the wastegate valve, wherein the position feedback voltage represents a valve position of the wastegate valve; a fault type determination module, configured to determine a fault type of the wastegate valve according to the fault information; The processing measure determination module is configured to determine the fault processing measure to be performed on the exhaust bypass valve according to the fault type, the position feedback voltage and the target opening value.

11. An electronic device, a memory, at least one processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the fault handling method according to any one of claims 1 to 9 is implemented.

12. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the fault handling method according to any one of claims 1 to 9 is implemented.

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