Egr valve zero voltage fault detection method, system and automobile

Abstract

The application discloses an EGR valve zero voltage fault detection method and system and an automobile. The method collects a to-be-verified parameter of the automobile, and confirms whether the to-be-verified parameter satisfies a preset self-learning condition. When it is confirmed that the to-be-verified parameter satisfies the preset self-learning condition, a current valve opening degree of the EGR valve of the automobile is detected. According to the current valve opening degree and a preset target valve opening degree, a predicted zero voltage of the EGR valve is determined. According to the predicted zero voltage, a fault detection result of the EGR valve is determined. In the process of self-learning the zero voltage of the EGR valve, the current valve opening degree of the EGR valve and the determined predicted zero voltage are detected, so that it is determined whether the EGR valve has a fault, the accuracy and efficiency of the fault detection of the EGR valve are improved, and the safety of the operation of the automobile is improved.

Description

Technical Field

[0001] This invention relates to the field of EGR valve fault detection technology, and in particular to a method, system, and automobile for detecting zero-position voltage faults in EGR valves. Background Technology

[0002] With the gradual development of the automotive industry, vehicle exhaust emissions have become a significant factor affecting the environment. The EGR (Exhaust Gas Recycle) system on a car's gasoline engine can effectively reduce the combustion temperature inside the cylinder, thereby reducing the content of nitrogen oxides in the exhaust gases.

[0003] A portion of the exhaust gas produced by a car's internal combustion engine enters the intake manifold from the exhaust pipe through the EGR valve of the EGR system. However, due to the harsh working environment of the EGR valve body, carbon deposits and sticking are prone to occur. Therefore, real-time fault detection of the EGR valve is required. In the existing technology, the presence of faults in the EGR valve is generally determined by manual inspection. However, manual inspection methods have the problems of low accuracy and low efficiency in fault detection. Summary of the Invention

[0004] This invention provides a method, system, and vehicle for detecting zero-position voltage faults in EGR valves, in order to solve the problems of low accuracy and efficiency in EGR valve fault detection.

[0005] A method for detecting zero-position voltage faults in an EGR valve includes:

[0006] Collect the vehicle's parameters to be verified and confirm whether the parameters to be verified meet the preset self-learning conditions;

[0007] When it is confirmed that the parameter to be verified meets the preset self-learning conditions, the current valve opening of the vehicle's EGR valve is detected;

[0008] Based on the current valve opening and the preset target valve opening, determine the predicted zero-position voltage of the EGR valve;

[0009] The fault detection result of the EGR valve is determined based on the predicted zero-position voltage.

[0010] An EGR valve zero-position voltage fault detection system includes a controller for performing the above-described EGR valve zero-position voltage fault detection method.

[0011] An automobile includes the aforementioned EGR valve zero-position voltage fault detection system.

[0012] The above-mentioned EGR valve zero-position voltage fault detection method, system, and vehicle involve the following steps: The method collects the parameters to be verified of the vehicle and confirms whether the parameters to be verified meet preset self-learning conditions; when the parameters to be verified meet the preset self-learning conditions, the method detects the current valve opening of the vehicle's EGR valve; based on the current valve opening and a preset target valve opening, the method determines the predicted zero-position voltage of the EGR valve; and based on the predicted zero-position voltage, the method determines the fault detection result of the EGR valve.

[0013] In the process of zero-position voltage self-learning of the EGR valve, this invention determines the fault detection result of the EGR valve by detecting the current valve opening degree and the determined predicted zero-position voltage, thereby determining whether the EGR valve is faulty. This improves the accuracy and efficiency of EGR valve fault detection. Furthermore, by using the fault detection result of the EGR valve, it can avoid the EGR valve from being opened when a fault exists, which would cause engine combustion cycle fluctuations or even stalling, thereby improving the safety of vehicle operation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a flowchart of an EGR valve zero-position voltage fault detection method according to an embodiment of the present invention;

[0016] Figure 2 This is a flowchart of step S30 in the EGR valve zero-position voltage fault detection method in one embodiment of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In one embodiment, such as Figure 1 As shown, a method for detecting zero-position voltage faults in an EGR valve is provided, comprising the following steps:

[0019] S10: Collect the parameters to be verified of the vehicle and confirm whether the parameters to be verified meet the preset self-learning conditions.

[0020] The parameters to be verified may include, but are not limited to, the vehicle's current speed, engine speed, battery voltage, intake air temperature, and engine coolant temperature. Furthermore, the preset self-learning conditions refer to the conditions used to verify whether the vehicle's EGR valve meets the zero-position voltage self-learning requirements.

[0021] In one embodiment, step S10, namely the collection of the vehicle's parameters to be verified, includes:

[0022] Detect whether the vehicle's electronic control unit is powered on;

[0023] Understandably, the power-on status indicates that the electronic control unit (ECU) has been turned on normally.

[0024] When the electronic control unit is powered on, the parameter to be verified is collected through the electronic control unit.

[0025] Specifically, after detecting whether the vehicle's electronic control unit is powered on, if the electronic control unit is powered on, the parameters to be verified are collected through the electronic control unit; if the electronic control unit is powered off, it indicates that the electronic control unit is not turned on normally, and then an electronic control unit turn-on command can be sent to switch the electronic control unit from the powered off state to the powered on state.

[0026] Furthermore, the method of collecting the parameters to be verified through the electronic control unit in this embodiment is only one example. That is, in addition to collecting the parameters to be verified through the electronic control unit, the parameters to be verified can also be collected in other ways, such as by setting up sensors.

[0027] In one embodiment, the preset self-learning conditions include one or more of the following conditions:

[0028] When the parameter to be verified includes the current speed of the vehicle, it is confirmed that the current speed is less than or equal to a preset speed threshold.

[0029] Understandably, the current vehicle speed refers to the car's current driving speed. A preset speed threshold can be set according to specific needs; for example, the preset speed threshold can be set to 0 km / h, 1 km / h, etc. Therefore, when the car's current speed is less than or equal to the preset speed threshold, it can be considered that the current speed in the parameter to be verified meets the preset self-learning condition; when the car's current speed is greater than the preset speed threshold, it can be considered that the current speed in the parameter to be verified does not meet the preset self-learning condition.

[0030] When the parameter to be verified includes the engine speed of the vehicle, it is confirmed that the engine speed is less than or equal to a preset speed threshold.

[0031] Understandably, engine speed refers to the rotational speed of the car's engine. A preset speed threshold can be set according to specific needs; for example, it could be set to 250 rpm. Therefore, when the car's engine speed is less than or equal to the preset speed threshold, the engine speed in the parameter to be verified is considered to meet the preset self-learning conditions; when the car's engine speed is greater than the preset speed threshold, the engine speed in the parameter to be verified is considered not to meet the preset self-learning conditions.

[0032] When the parameter to be verified includes the battery voltage of the vehicle, it is confirmed that the battery voltage is within the preset voltage range;

[0033] Understandably, the battery voltage is the voltage of the vehicle's power battery. The preset voltage range can be set according to specific needs; for example, the preset voltage range can be between 12V and 13V. Therefore, when the vehicle's battery voltage is within the preset voltage range, the battery voltage in the parameter to be verified is considered to meet the preset self-learning conditions; when the vehicle's battery voltage exceeds the preset voltage range (e.g., the battery voltage is less than the minimum value in the preset voltage range, or the battery voltage is greater than the maximum value in the preset voltage range), the battery voltage in the parameter to be verified is considered to not meet the preset self-learning conditions.

[0034] When the parameter to be verified includes the intake air temperature of the vehicle, it is confirmed that the intake air temperature is within the preset intake air temperature range;

[0035] Understandably, intake air temperature refers to the temperature of the gas measured at a certain location in the intake manifold of a vehicle. The preset air temperature range can be set according to specific needs; for example, the preset air temperature range can be set to 10°C to 15°C. Therefore, when the vehicle's intake air temperature is within the preset intake air temperature range, it can be considered that the intake air temperature in the parameter to be verified meets the preset self-learning conditions; when the vehicle's intake air temperature exceeds the preset intake air temperature range (e.g., the intake air temperature is less than the minimum value in the preset intake air temperature range, or the intake air temperature is greater than the maximum value in the preset intake air temperature range), it can be considered that the intake air temperature in the parameter to be verified does not meet the preset self-learning conditions.

[0036] When the parameter to be verified includes the engine coolant temperature of the vehicle, it is confirmed that the engine coolant temperature is within the preset coolant temperature range.

[0037] Understandably, engine coolant temperature refers to the coolant temperature of a car's engine. A preset coolant temperature range can be set according to specific needs; for example, it can be set between 85℃ and 95℃. Therefore, when the car's engine coolant temperature is within the preset range, it can be considered that the engine coolant temperature in the parameter to be verified meets the preset self-learning conditions; when the car's engine coolant temperature exceeds the preset range (e.g., the engine coolant temperature is greater than the maximum value of the preset range, or the engine coolant temperature is less than the minimum value of the preset range), it can be considered that the engine coolant temperature in the parameter to be verified does not meet the preset self-learning conditions.

[0038] S20: When it is confirmed that the parameter to be verified meets the preset self-learning conditions, the current valve opening of the EGR valve of the vehicle is detected.

[0039] Specifically, after collecting the parameters to be verified from the vehicle and confirming whether the parameters meet the preset self-learning conditions, if the parameters meet the preset self-learning conditions, the vertical movement position of the EGR valve stem is detected by the EGR valve position sensor installed on the EGR valve, and the current valve opening of the EGR valve is determined based on the vertical movement position of the EGR valve stem. In this embodiment, the EGR valve is preferably an electronic EGR valve.

[0040] S30: Determine the predicted zero-position voltage of the EGR valve based on the current valve opening and the preset target valve opening.

[0041] Understandably, the predicted zero-position voltage is the zero-position voltage determined by the current valve opening and the preset target valve opening. In other words, the predicted zero-position voltage needs to be further verified before it can be confirmed whether the predicted zero-position voltage can characterize the initial value of the zero-position voltage of the EGR valve.

[0042] In one embodiment, such as Figure 2 As shown, step S30 includes:

[0043] S301: Compare the current valve opening with the preset target valve opening;

[0044] S302: When the current valve opening is greater than the preset target valve opening, the preset target valve opening is reduced according to a preset fixed step size to obtain a first reduced valve opening;

[0045] Understandably, the preset target valve opening can be set according to specific needs. This preset target valve opening can be set to a value slightly greater than 0%. For example, the preset target valve opening can be set to 4%, 5%, etc. The preset fixed step size can be selected as 0.5%, 1%, etc.

[0046] Specifically, after detecting the current valve opening of the vehicle's EGR valve, the current valve opening is compared with a preset target valve opening. When the current valve opening is greater than the preset target valve opening, it indicates that the EGR valve can open normally. Therefore, the predicted zero-point voltage of the EGR valve can be further determined, and the preset target valve opening is then reduced by a preset fixed step size to obtain a first reduced valve opening. The preset target valve opening is reduced because it is set to a value slightly greater than 0%, while the current valve opening may exceed it significantly. Therefore, reducing the preset target valve opening allows for a faster determination of the predicted zero-point voltage of the EGR valve. Furthermore, in this embodiment, the preset target valve opening can be stored in a valve opening memory. After reducing the preset target valve opening by a preset fixed step size to obtain the first reduced valve opening, the first reduced valve opening can be stored in this valve opening memory, replacing the preset target valve opening.

[0047] S303: Adjust the current valve opening of the EGR valve to the first reduced valve opening, and obtain the first duty cycle of the EGR valve in real time;

[0048] Optionally, the first duty cycle can be directly determined based on the first reduction valve opening. That is, a lookup table of valve opening and duty cycle can be pre-stored in the vehicle's electronic control unit. This lookup table stores at least one set of data control groups, each containing corresponding valve openings and duty cycles. After determining the first reduction valve opening, the first duty cycle can be obtained by querying the lookup table for the duty cycle corresponding to the first reduction valve opening. Alternatively, a duty cycle calculation model can be trained in the electronic control unit (this model can be trained based on a large number of valve openings and their corresponding duty cycle values). This allows the duty cycle model to directly determine the corresponding first duty cycle after obtaining the first reduction valve opening.

[0049] S304: Within a preset detection period after adjusting the current valve opening, if the first duty cycle continues to be greater than or equal to the preset duty cycle limit, then the current zero-position voltage of the EGR valve is recorded as the predicted zero-position voltage.

[0050] Optionally, the preset detection duration can be set to 5s, 10s, etc. The preset duty cycle limit can be set to 70%, 80%, etc.

[0051] Specifically, after adjusting the current valve opening of the EGR valve to the first reduced valve opening and acquiring the first duty cycle of the EGR valve in real time, the detection time is calculated. Then, within a preset detection time after adjusting the current valve opening, if the first duty cycle remains greater than or equal to a preset duty cycle limit, the current zero-position voltage of the EGR valve is recorded as the predicted zero-position voltage. The current zero-position voltage can be detected by a voltage sensor installed on the EGR valve, and then recorded as the predicted zero-position voltage.

[0052] In one embodiment, after determining the first duty cycle of the EGR valve based on the first reduction in valve opening, the method further includes:

[0053] Within a preset detection time after adjusting the current valve opening, if the first duty cycle is less than the preset duty cycle limit, the first reduced valve opening is reduced according to the preset fixed step size to obtain the second reduced valve opening.

[0054] Specifically, within a preset detection time after adjusting the current valve opening, if the first duty cycle is detected to be less than the preset duty cycle limit at any time, the first valve opening is reduced according to a preset fixed step size, thereby obtaining the second valve opening.

[0055] The first reduction valve opening of the EGR valve is adjusted to the second reduction valve opening, and the second duty cycle of the EGR valve is obtained in real time.

[0056] Specifically, since the current valve opening is adjusted to the first reduced valve opening in the above steps, the current valve opening of the EGR valve is the first reduced valve opening. Then, after reducing the first reduced valve opening by the preset fixed step size to obtain the second reduced valve opening, the first reduced valve opening of the EGR valve is adjusted to the second reduced valve opening, and the second duty cycle of the adjusted EGR valve is obtained in real time. Furthermore, the second duty cycle corresponding to the second reduced valve opening can be determined through the above valve opening and duty cycle comparison table or the duty cycle calculation model.

[0057] If, within a preset detection period after adjusting the first reduction of valve opening, the second duty cycle continues to be greater than or equal to the preset duty cycle limit, then the current zero-position voltage of the EGR valve is recorded as the predicted zero-position voltage.

[0058] Specifically, after adjusting the first reduced valve opening of the EGR valve to the second reduced valve opening and acquiring the second duty cycle of the EGR valve in real time, if the second duty cycle continues to be greater than or equal to the preset duty cycle limit within a preset detection period after adjusting the first reduced valve opening, the current zero-position voltage of the EGR valve is recorded as the predicted zero-position voltage.

[0059] Furthermore, if the second duty cycle is less than the preset duty cycle limit, the valve opening is further reduced by a preset fixed step size. This process yields the third duty cycle, the fourth duty cycle, and so on. The specific implementation method is the same as described above and will not be repeated here. If the EGR valve opening is reduced to 0%, and the duty cycle corresponding to the 0% valve opening is still less than the preset duty cycle limit, an EGR valve fault signal is generated, allowing the preset receiver to confirm the EGR valve malfunction based on this signal.

[0060] In one embodiment, after comparing the current valve opening with the preset target valve opening, the method further includes:

[0061] When the current valve opening is less than the preset target valve opening, the number of times the zero-position voltage of the EGR valve is self-learned is obtained;

[0062] Understandably, the zero-position voltage self-learning count refers to the number of times the EGR valve completes zero-position voltage self-learning. Furthermore, a zero-position voltage self-learning cycle is recorded as complete only after executing steps S10 to S40 of this invention, and when the fault detection result indicates that the EGR valve has no fault.

[0063] Specifically, after comparing the current valve opening with the preset target valve opening, if the current valve opening is less than the preset target valve opening, it indicates that the EGR valve cannot open normally, and then the number of self-learning times of the zero-position voltage of the EGR valve is obtained.

[0064] A fault detection signal is generated based on the number of self-learning cycles of the zero-position voltage, and the fault detection signal is sent to a preset receiver.

[0065] Specifically, when the current valve opening is less than the preset target valve opening, after obtaining the number of self-learning cycles of the zero-position voltage of the EGR valve, a fault detection signal is generated based on the number of self-learning cycles of the zero-position voltage, and the fault detection signal is sent to the preset receiver.

[0066] For example, if the number of zero-position voltage self-learning times is less than 1, it indicates that the current zero-position voltage self-learning process may be the first zero-position voltage self-learning process of the EGR valve. This could be due to an accuracy error in detecting the current valve opening, causing the current valve opening to be smaller than the preset target valve opening. Alternatively, it could be due to a fault in the EGR valve itself, causing the current valve opening to be smaller than the preset target valve opening. In this case, a fault detection signal containing the current valve opening and the preset target valve opening can be sent to a preset receiver (which could be a maintenance worker) to determine the cause of the fault and resolve it.

[0067] For example, if the number of zero-position voltage self-learning cycles is greater than or equal to 1, it indicates that the zero-position voltage self-learning of the EGR valve has been successful at least once, which further indicates that the EGR valve may be faulty. Therefore, a fault detection signal can be sent to a preset receiver to detect the EGR valve. Further, in this embodiment, the generated fault detection signal can also be a corresponding fault code. That is, when the number of zero-position voltage self-learning cycles is less than 1, a fault code such as P049D 22 can be output; when the number of zero-position voltage self-learning cycles is greater than or equal to 1, a fault code such as P049D 72 can be output.

[0068] S40: Determine the fault detection result of the EGR valve based on the predicted zero-position voltage.

[0069] Understandably, the fault detection result characterizes the result of the EGR valve's zero-position voltage self-learning. The fault detection result can be a result indicating that the EGR valve has no fault, that is, the EGR valve's zero-position voltage self-learning is successful and the zero-position voltage of the EGR valve is determined; the fault detection result can also be a result indicating that the EGR valve has a fault, that is, the EGR valve's zero-position voltage self-learning is unsuccessful and the zero-position voltage of the EGR valve is not determined.

[0070] In one embodiment, step S40 includes:

[0071] The predicted zero-position voltage is compared with the lowest zero-position voltage threshold and the highest zero-position voltage threshold; the lowest zero-position voltage threshold is less than the highest zero-position voltage threshold.

[0072] Understandably, the lowest and highest zero-point voltage thresholds can be set according to specific needs or experience. The zero-point voltage range formed by the lowest and highest zero-point voltage thresholds can be used to determine whether the predicted zero-point voltage is accurate, further improving the accuracy of the EGR valve's zero-point voltage self-learning process.

[0073] When the predicted zero-position voltage is greater than or equal to the lowest zero-position voltage threshold and less than or equal to the highest zero-position voltage threshold, the fault detection result is determined to be that the EGR valve does not have a fault, and the zero-position voltage self-learning count is incremented by one.

[0074] Specifically, after determining the predicted zero-position voltage of the EGR valve based on the current valve opening and the preset target valve opening, the predicted zero-position voltage is compared with the lowest zero-position voltage threshold and the highest zero-position voltage threshold. When the predicted zero-position voltage is greater than or equal to the lowest zero-position voltage threshold and less than or equal to the highest zero-position voltage threshold, the fault detection result is determined to be that the EGR valve has no fault. Then, the predicted zero-position voltage can be recorded as the initial zero-position voltage of the EGR valve. At this time, it indicates that the zero-position voltage self-learning of the EGR valve has been completed once, and then the zero-position voltage self-learning count is incremented by one.

[0075] In one embodiment, after comparing the predicted zero-position voltage with the lowest zero-position voltage threshold and the highest zero-position voltage threshold, the method further includes:

[0076] When the predicted zero-position voltage is less than the lowest zero-position voltage threshold or greater than the highest zero-position voltage threshold, the fault detection result is confirmed to be a fault in the EGR valve.

[0077] Specifically, after comparing the predicted zero-position voltage with the lowest zero-position voltage threshold and the highest zero-position voltage threshold, if the predicted zero-position voltage is less than the lowest zero-position voltage threshold or greater than the highest zero-position voltage threshold, it indicates that the predicted zero-position voltage does not meet the requirements, and thus the fault detection result can be confirmed as a fault in the EGR valve.

[0078] Furthermore, in this embodiment, the zero-position voltage self-learning count is incremented by one only when the fault detection result indicates that the EGR valve is not faulty. This incremented count can then be used to confirm the number of successful zero-position voltage self-learning operations of the EGR valve. Alternatively, the zero-position voltage self-learning count can also be incremented by one when the fault detection result indicates that the EGR valve is faulty, thus determining the total number of zero-position voltage self-learning operations performed by the EGR valve.

[0079] Furthermore, when the predicted zero-position voltage is less than the lowest zero-position voltage threshold or greater than the highest zero-position voltage threshold, after confirming that the fault detection result indicates that the EGR valve is faulty, the number of self-learning cycles of the zero-position voltage of the EGR valve can also be obtained.

[0080] For example, when the number of zero-position voltage self-learning attempts is less than 1, that is, when the number of successful zero-position voltage self-learning attempts for the EGR valve is 0, it may also be that the EGR valve is performing zero-position voltage self-learning for the first time; when the number of zero-position voltage self-learning attempts is greater than or equal to 1, that is, when the number of successful zero-position voltage self-learning attempts for the EGR valve is greater than or equal to 1, then if the predicted zero-position voltage is less than the minimum zero-position voltage threshold and the number of zero-position voltage self-learning attempts is less than 1, a fault code P049D 21 can be generated; if the predicted zero-position voltage is less than the minimum zero-position voltage threshold and the number of zero-position voltage self-learning attempts is greater than or equal to 1, a fault code P049D 73 can be generated, indicating that when the predicted zero-position voltage is less than the minimum zero-position voltage threshold, the fault detection result is that the EGR valve has a fault.

[0081] For example, if the predicted zero-position voltage is greater than the highest zero-position voltage threshold and the number of zero-position voltage self-learning times is less than 1, a fault code P049D 22 can be generated; if the predicted zero-position voltage is greater than the highest zero-position voltage threshold and the number of zero-position voltage self-learning times is greater than or equal to 1, a fault code P049D 72 can be generated to indicate that when the predicted zero-position voltage is less than the lowest zero-position voltage threshold, the fault detection result is that the EGR valve has a fault.

[0082] In this embodiment, during the zero-position voltage self-learning process of the EGR valve, the fault detection result of the EGR valve is determined by detecting the current valve opening and the predicted zero-position voltage, thereby determining whether the EGR valve is faulty (e.g., if the current valve opening is less than the preset target valve opening, the EGR valve is confirmed to be faulty; or if the predicted zero-position voltage is less than the lowest zero-position voltage threshold or greater than the highest zero-position voltage threshold, the EGR valve is confirmed to be faulty). This improves the accuracy and efficiency of EGR valve fault detection. Furthermore, the fault detection result of the EGR valve can prevent the EGR valve from being opened when it is faulty, which could cause fluctuations in the engine combustion cycle or even stalling, thereby improving the safety of vehicle operation.

[0083] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0084] In one embodiment, an EGR valve zero-position voltage fault detection system is provided, including a controller for performing the EGR valve zero-position voltage fault detection method in the above embodiment.

[0085] In one embodiment, an automobile is provided, including the above-described EGR valve zero-position voltage fault detection system.

[0086] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0087] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0088] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for detecting zero-position voltage faults in an EGR valve, characterized in that, include: Collect the vehicle's parameters to be verified and confirm whether the parameters to be verified meet the preset self-learning conditions; When it is confirmed that the parameter to be verified meets the preset self-learning conditions, the current valve opening of the vehicle's EGR valve is detected; Based on the current valve opening and the preset target valve opening, determine the predicted zero-position voltage of the EGR valve; The fault detection result of the EGR valve is determined based on the predicted zero-position voltage; The step of determining the predicted zero-position voltage of the EGR valve based on the current valve opening and the preset target valve opening includes: Compare the current valve opening with the preset target valve opening; When the current valve opening is greater than the preset target valve opening, the preset target valve opening is reduced according to a preset fixed step size to obtain a first reduced valve opening. Adjust the current valve opening of the EGR valve to the first reduced valve opening, and obtain the first duty cycle of the EGR valve in real time; If, within a preset detection period after adjusting the current valve opening, the first duty cycle remains greater than or equal to a preset duty cycle limit, the current zero-position voltage of the EGR valve is recorded as the predicted zero-position voltage.

2. The EGR valve zero-position voltage fault detection method as described in claim 1, characterized in that, The step of determining the fault detection result of the EGR valve based on the predicted zero-position voltage includes: The predicted zero-position voltage is compared with the lowest zero-position voltage threshold and the highest zero-position voltage threshold; the lowest zero-position voltage threshold is less than the highest zero-position voltage threshold. When the predicted zero-position voltage is greater than or equal to the lowest zero-position voltage threshold and less than or equal to the highest zero-position voltage threshold, the fault detection result is determined to be that the EGR valve does not have a fault, and the zero-position voltage self-learning count is incremented by one.

3. The EGR valve zero-position voltage fault detection method as described in claim 2, characterized in that, After comparing the predicted zero-position voltage with the lowest and highest zero-position voltage thresholds, the method further includes: When the predicted zero-position voltage is less than the lowest zero-position voltage threshold or greater than the highest zero-position voltage threshold, the fault detection result is confirmed to be a fault in the EGR valve.

4. The EGR valve zero-position voltage fault detection method as described in claim 1, characterized in that, After acquiring the first duty cycle of the EGR valve in real time, the method further includes: Within a preset detection time after adjusting the current valve opening, if the first duty cycle is less than the preset duty cycle limit, the first reduced valve opening is reduced according to the preset fixed step size to obtain the second reduced valve opening. The first reduction valve opening of the EGR valve is adjusted to the second reduction valve opening, and the second duty cycle of the EGR valve is obtained in real time. If, within a preset detection period after adjusting the first reduction of valve opening, the second duty cycle continues to be greater than or equal to the preset duty cycle limit, then the current zero-position voltage of the EGR valve is recorded as the predicted zero-position voltage.

5. The EGR valve zero-position voltage fault detection method as described in claim 1, characterized in that, After comparing the current valve opening with the preset target valve opening, the method further includes: When the current valve opening is less than the preset target valve opening, the number of times the zero-position voltage of the EGR valve is self-learned is obtained; A fault detection signal is generated based on the number of self-learning cycles of the zero-position voltage, and the fault detection signal is sent to a preset receiver.

6. The EGR valve zero-position voltage fault detection method as described in claim 1, characterized in that, The preset self-learning conditions include one or more of the following conditions: When the parameter to be verified includes the current speed of the vehicle, it is confirmed that the current speed is less than or equal to a preset speed threshold. When the parameter to be verified includes the engine speed of the vehicle, it is confirmed that the engine speed is less than or equal to a preset speed threshold. When the parameter to be verified includes the battery voltage of the vehicle, it is confirmed that the battery voltage is within a preset voltage range; When the parameter to be verified includes the intake air temperature of the vehicle, it is confirmed that the intake air temperature is within the preset intake air temperature range; When the parameter to be verified includes the engine coolant temperature of the vehicle, it is confirmed that the engine coolant temperature is within the preset coolant temperature range.

7. The EGR valve zero-position voltage fault detection method as described in claim 1, characterized in that, The parameters to be verified for the collected vehicle include: Detect whether the vehicle's electronic control unit is powered on; When the electronic control unit is powered on, the parameter to be verified is collected through the electronic control unit.

8. An EGR valve zero-position voltage fault detection system, characterized in that, Includes a controller for performing the EGR valve zero-position voltage fault detection method as described in any one of claims 1 to 7.

9. A car, characterized in that, Including the EGR valve zero-position voltage fault detection system as described in claim 8.

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