Zero-position self-learning method, device, equipment and medium for EGR valves used in range extenders

Abstract

This application provides a method, apparatus, device, and medium for zero-position self-learning of an EGR valve for a range extender. The method includes: when it is determined that the EGR valve meets the self-learning conditions, controlling the valve stem assembly of the EGR valve to move along the closing direction of the EGR valve for a first set time until the EGR valve is completely closed; applying a first control signal to the EGR valve for a second set time; if, within the second set time, the value of the first control signal enters a first preset threshold range and the first feedback voltage signal is within the zero-position voltage range, reading the detected voltage value of the first feedback voltage signal of the current EGR valve as the zero-position voltage value of the EGR valve. By making the EGR valve completely closed and then applying the first control signal along the spring compression direction, while the EGR valve is in the closed state, the force provided by the first control signal is within the range that does not completely offset the spring pressure; this ensures that the gears controlling the EGR valve abut against each other without gaps, eliminates gear jamming, and ensures that the zero-position self-learning process of the EGR valve proceeds normally.

Description

Technical Field

[0001] This disclosure generally relates to the field of EGR valve zero-position self-learning, and specifically to a method, apparatus, equipment and medium for zero-position self-learning of EGR valve for range extenders. Background Technology

[0002] A DC-powered EGR valve (exhaust gas recirculation valve) mainly consists of a DC motor assembly, a sensor assembly, a gearbox reduction mechanism, an eccentric assembly, a return spring, and a linear motion valve stem assembly. Due to variations in raw materials and manufacturing processes, different EGR valves exhibit certain differences. To ensure accurate control of the EGR valve opening during use, it is necessary to accurately know the zero-point voltage value (the voltage value when the EGR valve is in the closed state) of each EGR valve. Therefore, zero-point voltage self-learning is required.

[0003] Existing DC EGR valves frequently experience gear jamming, primarily due to gaps between the gears inside the valve, making it difficult for the gears to drive the valve stem assembly. Consequently, EGR valve zero-position self-learning often fails due to zero-position jamming, rendering existing zero-position self-learning methods inapplicable. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a method, apparatus, device and medium for zero-position self-learning of EGR valve for range extenders.

[0005] Firstly, this application provides a zero-position self-learning method for an EGR valve used in a range extender, including:

[0006] In response to the key-off command, determine whether the EGR valve meets the self-learning conditions;

[0007] When it is determined that the EGR valve meets the self-learning conditions, the first moment when the self-learning conditions are met is recorded; from the first moment, the valve stem assembly of the EGR valve is controlled to move in the direction of EGR valve closing within a first set time until the EGR valve is completely closed.

[0008] Starting from the second moment, a first control signal is applied to the EGR valve within a second set time period; the value of the first control signal within the second set time period and the first feedback voltage signal of the EGR valve within the second set time period are recorded; wherein, the first control signal is used to apply a force along the spring compression direction to the valve stem assembly; the first control signal is a monotonically increasing signal; the first feedback voltage signal is used to detect the opening degree of the EGR valve;

[0009] If, within a second set time period, the value of the first control signal enters the range of the first preset threshold, and the first feedback voltage signal is within the zero voltage range, the increase of the first control signal is stopped; the detection voltage value of the first feedback voltage signal of the current EGR valve is read, and the detection voltage value is used as the zero voltage value of the EGR valve.

[0010] According to the technical solution provided in the embodiments of this application, starting from the second moment, a first control signal is applied to the EGR valve within a second set time; the value of the first control signal within the second set time and the first feedback voltage signal of the EGR valve within the second set time are recorded;

[0011] If, within a second set time period, the value of the first control signal does not fall within the first preset threshold range, or the first feedback voltage signal is not in the zero voltage range, the process returns to the step of determining whether the EGR valve meets the self-learning conditions, until the number of consecutive determinations that the valve does not meet the conditions reaches the sixth set threshold.

[0012] According to the technical solution provided in the embodiments of this application, determining whether the EGR valve meets the self-learning conditions includes:

[0013] Record the second feedback voltage signal of the EGR valve within a third set time period;

[0014] Based on the second feedback voltage signal, determine whether the EGR valve meets the self-learning conditions;

[0015] The second feedback voltage signal is used to detect the opening degree of the EGR valve.

[0016] According to the technical solution provided in the embodiments of this application, the recording of the second feedback voltage signal of the EGR valve within a third set time period includes:

[0017] Starting from the third moment after responding to the key closing command, within the third set time period, the control valve stem assembly moves in the direction of opening the EGR valve, and the second feedback voltage signal of the EGR valve is recorded during the movement process;

[0018] The step of determining whether the EGR valve meets the self-learning conditions based on the second feedback voltage signal includes:

[0019] The voltage value of the second feedback voltage signal at the sixth moment is obtained, where the sixth moment is the moment corresponding to the third moment plus the third set time, and it is determined that: when the voltage value of the second feedback voltage signal at the sixth moment is within the range of the second set threshold, the EGR valve meets the self-learning condition.

[0020] The valve stem assembly is controlled to stop moving.

[0021] According to the technical solution provided in the embodiments of this application, after obtaining the voltage value of the second feedback voltage signal at the sixth moment, the method further includes:

[0022] If the voltage value of the second feedback voltage signal at the sixth moment does not reach the second set threshold, it is determined that the EGR valve has not reached the self-learning condition.

[0023] Start a counter to increment the number of times the condition was not met, and store the number of times the condition was not met in the first data packet; wherein the initial value of the number of times the condition was not met is set to zero, and is reset to zero after the EGR valve is determined to meet the self-learning condition.

[0024] According to the technical solution provided in the embodiments of this application, after starting the counter, incrementing the number of times the condition was not met, and storing the number of times the condition was not met in the first data packet, the method further includes:

[0025] Judgment: When the number of times the condition is not met is greater than or equal to the third set threshold, an alarm message is displayed and the self-learning process is exited;

[0026] When the number of times the condition is not met is less than the third set threshold, the step of determining whether the EGR valve meets the self-learning condition is repeated.

[0027] According to the technical solution provided in the embodiments of this application, before applying a first control signal to the EGR valve within a second set time period starting from the second moment; recording the value of the first control signal within the second set time period, and the first feedback voltage signal of the EGR valve within the second set time period, the method further includes:

[0028] After the EGR valve is fully closed at the fourth moment, a second control signal is applied to the EGR valve along the spring extension direction within a fourth set time period; wherein, the fourth moment is equal to the first moment plus the first set time, and the second control signal is a monotonically increasing signal;

[0029] During the fourth set time period, the third feedback voltage signal of the EGR valve is recorded;

[0030] At the fifth moment, when it is determined that the third feedback voltage signal is within the fourth set threshold range and the second control signal is within the fifth set threshold range, the second control signal is controlled to stop increasing; the fifth moment is equal to the fourth moment plus the fourth set time.

[0031] Starting from the fifth time point, within a fifth set time period, the second control signal is reduced to zero, and the time when the second control signal drops to zero is taken as the second time point.

[0032] Secondly, this application provides a computer device; comprising: a memory, a processor, and a design program stored in the memory for performing EGR valve zero-position self-learning; the design program for performing EGR valve zero-position self-learning is configured to:

[0033] The above method for zero-position self-learning of the EGR valve for the range extender is described.

[0034] Thirdly, this application provides a storage medium; the storage medium stores a design program for EGR valve self-learning, which, when executed, is used for:

[0035] The above method for zero-position self-learning of the EGR valve for the range extender is described.

[0036] The beneficial effects of this application are as follows:

[0037] This application provides a zero-position self-learning method for an EGR valve used in a range extender, comprising: responding to a key-off command; when it is determined that the EGR valve meets the self-learning conditions, controlling the EGR valve to be completely closed within a first set time period; applying a first control signal to the EGR valve along the spring compression direction within a second set time period; stopping the increase of the first control signal when the value of the first control signal is within the range of a first preset threshold and the first feedback voltage signal is within the zero-position voltage range; reading the detection voltage value of the first feedback voltage signal of the current EGR valve, and using the detection voltage value as the zero-position voltage value of the EGR valve. By making the EGR valve completely closed and then applying the first control signal along the spring compression direction to it; under the premise that the EGR valve is in the closed state, the force provided by the first control signal is within the range that does not completely offset the spring pressure; it is possible to ensure that the gears controlling the EGR valve abut against each other without gaps, eliminating the problem of gear jamming, and ensuring that the zero-position self-learning process of the EGR valve proceeds normally. Attached Figure Description

[0038] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0039] Figure 1 A flowchart illustrating a zero-position self-learning method for an EGR valve used in a range extender, provided in this application;

[0040] Figure 2 The waveform diagram shows the duty cycle of the control signal received by the EGR valve along the spring compression direction.

[0041] Figure 3 The waveform of the EGR valve feedback voltage signal;

[0042] Figure 4This is a timing diagram of the EGR valve's zero-position self-learning process.

[0043] Figure 5 This is a schematic diagram of the EGR valve.

[0044] Among them, 1. First moment; 1-1. First set time; 2. Second moment; 2-2. Second set time; 3. Third moment; 3-3. Third set time; 4. Fourth moment; 4-4. Fourth set time; 5. Fifth moment; 5-5. Fifth set time; 6. Drive motor; 7. Planetary gear; 8. Cam; 9. Valve stem assembly; 10. Abutment part; 11. Spring; 12. Air inlet. Detailed Implementation

[0045] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] Example 1

[0048] Please refer to Figure 1-3 This embodiment provides a zero-position self-learning method for the EGR valve used in a range extender. This method is applicable to situations where the EGR valve begins zero-position self-learning after receiving a stop command, and is executed by the ECU. Specifically, the method includes:

[0049] S1: In response to the key-off command, determine whether the EGR valve meets the self-learning conditions;

[0050] S2: When it is determined that the EGR valve meets the self-learning conditions, record the first moment 1 when the self-learning conditions are met; from the first moment, control the valve stem assembly of the EGR valve to move in the direction of EGR valve closing within the first set time 1-1 until the EGR valve is completely closed.

[0051] S3: Starting from the second moment 2, apply a first control signal to the EGR valve within the second set time 2-2; record the value of the first control signal within the second set time, and the first feedback voltage signal of the EGR valve within the second set time; wherein, the first control signal is used to apply a force along the spring compression direction to the valve stem assembly; the first control signal is a monotonically increasing signal; the first feedback voltage signal is used to detect the opening degree of the EGR valve;

[0052] S4: If, within the second set time 2-2, the value of the first control signal enters the first preset threshold range and the first feedback voltage signal is within the zero voltage range, stop increasing the first control signal; read the detection voltage value of the first feedback voltage signal of the current EGR valve and use the detection voltage value as the zero voltage value of the EGR valve.

[0053] Specifically, refer to Figure 5 The EGR valve includes: a valve stem assembly 9, an air inlet 12, and a spring 11; the abutment portion 10 of the valve stem assembly 9 away from the air inlet 12 is sleeved on the cam 8, and the cam 8 is connected to the drive motor 6 through a planetary gear 7.

[0054] In its natural state, without a control signal to control the EGR valve's movement, the valve stem assembly 9 will be in a naturally closed state under the action of the spring 11. To ensure that the valve stem assembly can be fully closed in its natural state, the spring force is set to be relatively large. After the valve stem assembly is fully closed, the spring still retains some force, causing the valve stem assembly to abut against the air inlet 12. The compression direction of the spring is the direction in which the EGR valve opens.

[0055] When the drive motor rotates forward, it drives the cam 8 to rotate through the planetary gear 7, so that the cam 8 and the abutting part 10 of the valve stem assembly 9 abut against each other, driving the valve stem assembly to overcome the pressure of the spring 11 and move in the opening direction, that is, the valve stem assembly moves away from the air inlet.

[0056] When the motor reverses, the drive motor 6 drives the valve stem assembly 9 to move in the closing direction through the planetary gear 7 and the cam 8, that is, the valve stem assembly moves closer to the air inlet; if the valve stem assembly 9 is in a completely closed state, the drive motor 6 will not continue to move the valve stem assembly 9 in the closing direction if it continues to reverse.

[0057] Specifically, a voltage sensor can be connected to the planetary gear 7. This sensor measures the voltage value of the feedback voltage signal to indirectly display the opening and closing state of the EGR valve. A higher first feedback voltage signal indicates a greater degree of opening of the EGR valve, while a lower first feedback voltage signal indicates a smaller degree of opening. Optionally, this sensor can be a Hall effect sensor.

[0058] In some implementations, the EGR valve is controlled to open and close via an ECU (Engine Control Unit). The specific control process includes: after the ECU detects that the vehicle is turned off, it issues a key-off command; at this time, the EGR valve is in a naturally closed state under the action of a spring, and then it is determined whether the EGR valve meets the self-learning conditions.

[0059] Specifically, the self-learning condition is met when the planetary gears can transmit power normally without gear jamming, and can normally drive the valve stem assembly to open and close. The self-learning condition is not met when the planetary gears jam, cannot transmit power normally under the drive of the motor, and cannot drive the valve stem assembly to open and close normally.

[0060] Specifically, during the process of determining whether the EGR valve meets the self-learning conditions, the ECU controls the EGR valve to open, and the EGR valve is in the open state when the determination is completed. At this time, the first moment is recorded, which is the moment when it is determined that the EGR valve meets the self-learning conditions.

[0061] From the first moment, within a first set time period, the control valve stem assembly moves in the direction of EGR valve closure until the EGR valve is completely closed.

[0062] After the EGR valve is fully closed, starting from the second moment, a first control signal is applied to the EGR valve along the spring compression direction for a second set time period; the first control signal is a monotonically increasing signal; the value of the first control signal during the second set time period, and the first feedback voltage signal of the EGR valve during the second set time period are recorded.

[0063] At this time, based on the magnitudes of the first control signal and the first feedback voltage signal within the second set time period, the following two situations may occur:

[0064] Scenario 1: Within a second set time period, the value of the first control signal enters the range of the first preset threshold, and the first feedback voltage signal is within the zero voltage range. In this case, the increase of the first control signal is stopped; the detected voltage value of the current EGR valve's first feedback voltage signal is read, and this detected voltage value is used as the zero voltage value of the EGR valve.

[0065] In some implementations, the first control signal drives the drive motor to operate by adjusting the duty cycle of the signal, which in turn drives the valve stem assembly to move via planetary gears and a cam. A higher duty cycle indicates a greater force applied to the valve stem assembly, and vice versa.

[0066] Specifically, to ensure that there is no backlash between the planetary gears that could cause jamming during the self-learning process, this embodiment applies a first control signal to the EGR valve, thereby creating a small contact force between the gears. This contact force is sufficient to allow the gears to contact each other without completely offsetting the spring pressure. Since the force applied by the drive motor completely offsets the spring pressure when the duty cycle reaches 10%, there is no contact between the valve stem assembly and the air inlet, making it prone to gaps and air leakage. When the duty cycle is below 3%, the applied force is too small to allow the gears to contact each other, failing to prevent jamming. Therefore, the first preset threshold range is a duty cycle greater than 3% and less than 10%. By determining whether the value of the first control signal falls within the first preset threshold range, it can be ensured that a contact force is generated between the gears when the zero-position voltage is subsequently read, without offsetting the spring pressure, thus eliminating gear backlash and preventing jamming that could cause the self-learning process to fail.

[0067] In some implementations, after the EGR valve is manufactured, it undergoes multiple tests to measure its zero-point voltage. Because the valve body structure is not entirely identical, the zero-point voltage value of each EGR valve will not be exactly the same; however, the zero-point voltage of EGR valves produced in the same batch will fall within the same range; that is, the zero-point voltage range. Therefore, in this embodiment, the zero-point voltage range is set to 1V ± 0.1V. The zero-point voltage range provides a reference range for voltage reading. By determining whether the first feedback voltage signal is within the zero-point voltage range, it ensures that the voltage read subsequently is the correct voltage value when the EGR valve is in the closed state. If no zero-point voltage range is set, it is impossible to know whether the read voltage value is the voltage value read when the EGR valve is normally closed.

[0068] Scenario 2: If, within a second set time period, the value of the first control signal does not fall within the first preset threshold range, or the first feedback voltage signal is not within the zero voltage range, then the process returns to the step of determining whether the EGR valve meets the self-learning conditions, until the number of consecutive determinations that the valve does not meet the conditions reaches the sixth set threshold.

[0069] In some implementations, the sixth threshold is set to five times.

[0070] Specifically, due to differences between components and actual conditions, the zero-point self-learning process will not always successfully obtain the zero-point voltage on the first attempt. Therefore, the self-learning process needs to be repeated. If the EGR valve fails to obtain a zero-point voltage within the zero-point voltage range after five consecutive checks to determine if it meets the self-learning conditions, the self-learning process stops, and an alarm is issued to remind the EGR valve to be replaced. This method enables an effective self-learning process, avoiding false alarms caused by detection errors; simultaneously, when the EGR valve is indeed faulty, an alarm can be issued promptly to remind the user to replace it, preventing a vicious cycle.

[0071] Furthermore, determining whether the EGR valve meets the self-learning conditions includes:

[0072] Record the second feedback voltage signal of the EGR valve within a third set time period of 3-3; the second feedback voltage signal is used to detect the opening degree of the EGR valve; determine whether the EGR valve meets the self-learning conditions based on the second feedback voltage signal.

[0073] refer to Figure 3 Both the first and second feedback voltage signals are detected by the same Hall sensor, used to indirectly detect the opening degree of the EGR valve. For ease of description and distinction, the voltage signal lasting for a second set time from the second moment is called the first feedback voltage signal; the voltage signal lasting for a third set time from the third moment is called the second feedback voltage signal. Figure 3 The first feedback voltage signal is a voltage signal that starts from 650ms of the self-learning time and ends at 800ms; the second feedback voltage signal is a voltage signal that starts from 0ms of the self-learning time and ends at 200ms.

[0074] Specifically, the ability of the EGR valve to reach self-learning conditions is determined by measuring the second feedback voltage signal of the EGR valve within a third set time period. Since the opening and closing degree of the valve stem assembly cannot be directly measured, a sensor is needed to indirectly measure the valve stem assembly's opening degree. A larger feedback voltage value indirectly indicates a larger valve stem assembly opening degree; a smaller feedback voltage indirectly indicates a smaller valve stem assembly opening degree. This method allows for indirect measurement of the EGR valve's opening degree, facilitating the self-learning process.

[0075] Furthermore, the process of initially determining whether the EGR valve meets the self-learning conditions after receiving the key-closing command specifically includes the following steps:

[0076] Step 1: Record the third moment 3 in response to the key closing command. From the third moment, within the third set time, control the valve stem assembly to move in the direction of opening the EGR valve; and record the second feedback voltage signal of the EGR valve during the movement process.

[0077] Step 2: Obtain the voltage value of the second feedback voltage signal at the sixth time, where the sixth time is the time corresponding to the third time plus the third set time, and determine: when the voltage value of the second feedback voltage signal at the sixth time is within the range of the second set threshold, the EGR valve is determined to meet the self-learning condition; at this time, the sixth time is the same time as the first time at which the EGR valve is determined to meet the self-learning condition.

[0078] Step 3: Control the valve stem assembly to stop moving. Specifically, upon receiving the key-off command, the ECU controls the EGR valve to gradually open. When the gears are not jammed, the valve stem assembly will move normally, and the feedback voltage will increase as the valve stem assembly opens. Similarly, if gear jamming occurs, the valve stem assembly will not continue to increase within the third set time period, and the feedback voltage will not increase accordingly. Therefore, by simply detecting whether the second feedback voltage signal reaches the second set threshold range within the third set time period, it can be determined whether gear jamming has occurred, and thus whether the self-learning conditions are met.

[0079] In some implementations, the second set threshold is 1.2V, and the range of the second set threshold is a range greater than 1.2V.

[0080] Further, if the second feedback voltage signal does not reach the second set threshold within the third set time, it is determined that the EGR valve has not met the self-learning condition. At this time, a counter is started to increment the number of times the condition has not been met, and the number of times the condition has not been met is stored in the first data packet. The initial value of the number of times the condition has not been met is set to zero, and is reset to zero after the EGR valve is determined to meet the self-learning condition. The process continues to determine whether the number of times the condition has not been met reaches the third set threshold. If the number of times the condition has not been met is greater than or equal to the third set threshold, an alarm message is displayed and the self-learning process is exited. If the number of times the condition has not been met is less than the third set threshold, the step of determining whether the EGR valve meets the self-learning condition is repeated. In some embodiments, the third set threshold is five times. The process of repeatedly determining whether the EGR valve meets the self-learning condition is similar to the process of the first determination (steps one to three) described above, except that the "third moment of receiving the key closing command" is replaced with the corresponding moment when the EGR valve is determined to be re-determined.

[0081] Specifically, due to differences between the components and actual conditions, the zero-point self-learning process will not always successfully obtain the zero-point voltage on the first attempt. Therefore, the self-learning process needs to be repeated. If the self-learning conditions are not met after five consecutive checks (i.e., no zero-point voltage is obtained within the zero-point voltage range after five checks), the self-learning process stops, and an alarm is issued to remind the EGR valve to be replaced. This method enables an effective self-learning process, avoiding false alarms caused by detection errors. Simultaneously, when the EGR valve is indeed faulty, an alarm can be issued promptly to remind the user to replace it, preventing a vicious cycle.

[0082] Furthermore, between steps S2 and S3, the following steps are also included:

[0083] After the EGR valve is fully closed at the fourth time point 4, a second control signal is applied to the EGR valve along the spring extension direction within a fourth set time period 4-4; the second control signal is a monotonically increasing signal; the fourth time point is equal to the first time point plus the first set time period; within the fourth set time period, the third feedback voltage signal of the EGR valve is recorded. For ease of distinction and description, the voltage signal detected by the Hall sensor within the fourth set time period from the fourth time point is referred to as the third feedback voltage signal.

[0084] At the fifth moment, when it is determined that the third feedback voltage signal is within the fourth set threshold range and the second control signal is within the fifth set threshold range, the second control signal is controlled to stop increasing; the fifth moment is equal to the fourth moment plus the fourth set time.

[0085] Starting from the fifth moment, within the fifth set time 5-5, the second control signal is reduced to zero; and the moment when the second control signal drops to zero is taken as the second moment.

[0086] Specifically, determining that the third feedback voltage signal is within the fourth set threshold range is to monitor the position of the valve stem assembly using the voltage signal detected by the Hall sensor. Due to prolonged operation, carbon deposits may accumulate at the air inlet of the EGR valve, making it difficult for the valve stem assembly to achieve a complete airtight seal with the air inlet. Under the action of the second control signal, the end of the valve stem assembly 9 closest to the air inlet 12 forms a tighter contact with the air inlet; this tight contact force will cause the carbon deposits to be squeezed out of the air inlet 12, making it difficult for the valve stem assembly to maintain an airtight seal with the air inlet again. If the generated contact force is too strong, the valve stem assembly will be too tightly pressed against the air inlet, making it difficult for the valve stem assembly to open again; in severe cases, the valve stem assembly may be damaged by passing through the air inlet.

[0087] Therefore, monitoring the position of the valve stem assembly using the voltage signal detected by the Hall sensor is to prevent the valve stem assembly from being too tightly pressed against the air inlet; when the valve stem assembly passes through the air inlet, an alarm is triggered in time to prompt the replacement of the EGR valve.

[0088] In some implementations, the fourth set threshold range is greater than 0.8V and less than or equal to 1.0V. An alarm is generated when the third feedback value falls below 0.8V. At this point, the valve stem assembly may have been damaged due to excessive pressure, and to avoid further malfunction, the EGR valve needs to be replaced and the self-learning process restarted.

[0089] Specifically, determining that the second control signal is within the fifth preset threshold range is to monitor whether the output control signal is too large using the second control signal from the output control signal side. When the output control signal is too large, the valve stem assembly may become too tightly pressed against the air inlet, as described above, making it difficult to open again; in severe cases, the valve stem assembly may even pass through the air inlet and be damaged. Therefore, by simultaneously using the voltage signal detected by the Hall sensor to monitor the position of the valve stem assembly during the process of cleaning carbon deposits by pressing the valve stem assembly against the air inlet, and by using the second control signal from the output control signal side to monitor whether the output control signal is too large, the position of the valve stem assembly can be detected more accurately, avoiding situations where the valve stem assembly is too tightly pressed against the air inlet or the valve stem assembly passes through the air inlet.

[0090] In some implementations, reference Figure 2 The sign of the duty cycle in the diagram indicates only the direction of the force applied to the valve stem assembly by the control signal output. The vertical axis represents the duty cycle. A positive duty cycle indicates that a force is applied to the valve stem assembly in the opening direction; a negative duty cycle indicates that a force is applied to the valve stem assembly in the closing direction.

[0091] Figure 2 The waveform of the duty cycle of the control signal along the spring compression direction received by the EGR valve is shown. 0ms represents the third moment after receiving the key-off command. The interval from 0ms to 200ms represents the period during which the EGR valve is judged to meet the self-learning conditions. The interval from 200ms to 300ms represents the period during which the ECU controls the EGR valve to gradually close. The interval from 300ms to 600ms represents the period during which the control signal gradually increases in the negative direction of the vertical axis. The interval from 600ms to 650ms represents the period during which the control signal gradually decreases in the negative direction of the vertical axis. The control signal in these two intervals (300ms to 650ms) is the "second control signal" in the above embodiment. The interval from 650ms to 800ms represents the period during which the control signal gradually increases in the positive direction of the vertical axis. The signal in this interval is the "first control signal" in the above embodiment. The feedback voltage signal of the EGR valve during the same period is shown below. Figure 3 As shown.

[0092] The fifth set threshold range is a duty cycle greater than 0% and less than or equal to 30%. Setting the fifth set threshold to a duty cycle of no more than 30% allows the valve stem assembly to generate a force that abuts against the air inlet, squeezing out carbon deposits from the air inlet without causing excessive extrusion pressure that could damage the valve stem assembly. Combined with... Figure 3 It can be seen that the feedback voltage signal decreases slightly during the learning time of 300ms to 600ms, indicating that there was carbon buildup at the air inlet, which made it difficult for the valve stem assembly to completely seal with the air inlet. After the tight contact process, the carbon buildup has been squeezed out of the air inlet by the valve stem assembly.

[0093] Specifically, an alarm is triggered when the duty cycle of the second control signal exceeds 30%. At this point, the valve stem assembly may have been damaged due to excessive pressure, and to avoid further malfunction, the EGR valve needs to be replaced and the self-learning process restarted.

[0094] For ease of distinction and description, the signal output to the drive motor for a continuous fourth set time starting from the fourth moment is called the second control signal; the signal output to the drive motor for a continuous fifth set time starting from the fifth moment is called the third control signal.

[0095] Specifically, all steps of the EGR valve zero-position self-learning method for range extenders provided in this application are arranged in chronological order as follows: Figure 4 As shown: the moment of responding to the key-closing command is taken as the third moment; starting from the third moment 3, the EGR valve is gradually opened, and after a third set time 3-3, it is determined at the sixth moment that the EGR valve meets the self-learning conditions. During this process, the Hall sensor detects and outputs the second feedback voltage signal.

[0096] In the technical solution of this application, after the EGR valve is determined to meet the self-learning conditions, the ECU immediately controls the EGR valve to proceed to the next step; therefore, the sixth moment here is the same as the first moment 1.

[0097] Starting from the first moment 1, the ECU controls the EGR valve to gradually close. After the first set time 1-1, the EGR valve is in a closed state under the action of the spring in its natural state. This moment is the fourth moment 4.

[0098] Starting from the fourth time 4, an increasing second control signal is applied to the drive motor for a continuous fourth set time 4-4. The control valve stem assembly is in close contact with the air intake to remove carbon deposits. The fourth set time 4-4 ends at the fifth time 5, at which point the increase of the second control signal stops. At the same time, the Hall sensor detects and outputs the third feedback voltage signal during this process.

[0099] Starting from the fifth time 5, the second control signal is gradually reduced to zero for a continuous period of the fifth set time 5-5. The moment when the second signal reduces to zero is the second time 2.

[0100] Starting from the second moment 2, the first control signal is gradually increased over the second set time 2-2, while the Hall sensor detects and outputs the first feedback voltage signal.

[0101] When the value of the first control signal enters the first preset threshold range and the first feedback voltage signal is in the zero voltage range, the increase of the first control signal stops, the current detection voltage value of the first feedback voltage signal is taken as the zero voltage value of the EGR valve, and the zero self-learning process ends.

[0102] Example 2

[0103] This embodiment provides a zero-position self-learning device for an EGR valve used in a range extender, comprising:

[0104] The condition judgment module is used to determine whether the EGR valve meets the self-learning conditions in response to the key-off command;

[0105] The control shutdown module is used to determine when the EGR valve meets the self-learning conditions, record the first moment when the self-learning conditions are met; from the first moment, within a first set time, control the valve stem assembly of the EGR valve to move along the closing direction of the EGR valve until the EGR valve is completely closed.

[0106] A first control module is configured to apply a first control signal to the EGR valve from a second time interval, within a second set time period; record the value of the first control signal within the second set time period, and the first feedback voltage signal of the EGR valve within the second set time period; wherein the first control signal is used to apply a force along the spring compression direction to the valve stem assembly; the first control signal is a monotonically increasing signal; and the first feedback voltage signal is used to detect the opening degree of the EGR valve.

[0107] The voltage detection module is used to stop increasing the first control signal if, within a second set time, the value of the first control signal enters a first preset threshold range and the first feedback voltage signal is within a zero voltage range; and to read the detected voltage value of the first feedback voltage signal of the current EGR valve and use the detected voltage value as the zero voltage value of the EGR valve.

[0108] This embodiment is implemented based on any of the above embodiments and can achieve the beneficial effects of any of the above embodiments.

[0109] Example 3

[0110] This embodiment provides a computer device, including: a memory, a processor, and a design program stored in the memory for performing EGR valve zero-position self-learning; the design program for performing EGR valve zero-position self-learning is configured to:

[0111] Perform the zero-position self-learning method for the EGR valve of the range extender provided in any of the above embodiments.

[0112] Computer devices include a central processing unit (CPU), which performs various appropriate actions and processes based on programs stored in read-only memory (ROM) or loaded from memory into random access memory (RAM). RAM also stores various programs and data required for system operation. The CPU, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0113] The following components are connected to the I / O interface: input sections including keyboards, mice, etc.; output sections including cathode ray tubes (CRTs), liquid crystal displays (LCDs), and speakers; storage sections including hard disks; and communication sections including network interface cards such as LAN cards and modems. The communication sections perform communication processing via networks such as the Internet. Drives are also connected to the I / O interface as needed. Removable media, such as disks, optical disks, magneto-optical disks, semiconductor memories, etc., are installed on the drive as needed so that computer programs read from them can be installed into the storage section as required.

[0114] In particular, according to embodiments of the present invention, the processes described above can be implemented as computer software programs. For example, Embodiment 3 of the present invention includes a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowchart. In such embodiments, the computer program can be downloaded and installed from a network via a communication component, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), it performs the functions defined in the system of this application as described above.

[0115] It should be noted that the computer-readable medium shown in this invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In this invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0116] Example 4

[0117] This embodiment provides a storage medium, including: a design program for EGR valve self-learning stored on the storage medium, which, when executed, is used for:

[0118] The method for zero-position self-learning of the EGR valve for the range extender provided in any of the above embodiments.

[0119] In another aspect, this application also provides a computer-readable medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The computer-readable medium carries one or more programs that, when executed by the electronic device, cause the electronic device to implement the zero-position self-learning method for the EGR valve of the range extender as described in the above embodiments.

[0120] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zero-position self-learning method for an EGR valve used in a range extender, characterized in that, include: In response to the key-off command, determine whether the EGR valve meets the self-learning conditions; When it is determined that the EGR valve meets the self-learning conditions, the first moment when the self-learning conditions are met is recorded; from the first moment, the valve stem assembly of the EGR valve is controlled to move in the direction of EGR valve closing within a first set time until the EGR valve is completely closed. After the EGR valve is fully closed at the fourth moment, a second control signal is applied to the EGR valve along the spring extension direction within a fourth set time period; wherein, the fourth moment is equal to the first moment plus the first set time, and the second control signal is a monotonically increasing signal; During the fourth set time period, the third feedback voltage signal of the EGR valve is recorded; At the fifth moment, when it is determined that the third feedback voltage signal is within the fourth set threshold range and the second control signal is within the fifth set threshold range, the second control signal is controlled to stop increasing; the fifth moment is equal to the fourth moment plus the fourth set time. Starting from the fifth moment, within a fifth set time period, the second control signal is reduced to zero, and the moment when the second control signal is reduced to zero is taken as the second moment; Starting from the second moment, a first control signal is applied to the EGR valve within a second set time period; the value of the first control signal within the second set time period and the first feedback voltage signal of the EGR valve within the second set time period are recorded; wherein, the first control signal is used to apply a force along the spring compression direction to the valve stem assembly; the first control signal is a monotonically increasing signal; the first feedback voltage signal is used to detect the opening degree of the EGR valve; If, within a second set time period, the value of the first control signal enters the range of the first preset threshold, and the first feedback voltage signal is within the zero voltage range, the increase of the first control signal is stopped; the detection voltage value of the first feedback voltage signal of the current EGR valve is read, and the detection voltage value is used as the zero voltage value of the EGR valve.

2. The zero-position self-learning method for the EGR valve of the range extender according to claim 1, characterized in that, After applying a first control signal to the EGR valve for a second set time period starting from the second time period; recording the value of the first control signal and the first feedback voltage signal of the EGR valve for the second set time period; If the value of the first control signal does not enter the first preset threshold range within the second set time period, or the first feedback voltage signal is not in the zero voltage range, return to the step of determining whether the EGR valve meets the self-learning conditions, until the number of consecutive determinations that do not meet the conditions reaches the sixth set threshold.

3. The zero-position self-learning method for the EGR valve of the range extender according to claim 1, characterized in that, The determination of whether the EGR valve meets the self-learning conditions includes: Record the second feedback voltage signal of the EGR valve within a third set time period; Based on the second feedback voltage signal, determine whether the EGR valve meets the self-learning conditions; The second feedback voltage signal is used to detect the opening degree of the EGR valve.

4. The zero-position self-learning method for the EGR valve of the range extender according to claim 3, characterized in that, The second feedback voltage signal of the EGR valve recorded within a third set time period includes: Starting from the third moment after responding to the key closing command, within the third set time period, the control valve stem assembly moves in the direction of opening the EGR valve, and the second feedback voltage signal of the EGR valve is recorded during the movement process; The step of determining whether the EGR valve meets the self-learning conditions based on the second feedback voltage signal includes: The voltage value of the second feedback voltage signal at the sixth moment is obtained, where the sixth moment is the moment corresponding to the third moment plus the third set time, and it is determined that: when the voltage value of the second feedback voltage signal at the sixth moment is within the range of the second set threshold, the EGR valve meets the self-learning condition. The valve stem assembly is controlled to stop moving.

5. The zero-position self-learning method for the EGR valve of the range extender according to claim 4, characterized in that, After obtaining the voltage value of the second feedback voltage signal at the sixth moment, the method further includes: If the voltage value of the second feedback voltage signal at the sixth moment does not reach the second set threshold, it is determined that the EGR valve has not reached the self-learning condition. Start a counter to increment the number of times the condition was not met, and store the number of times the condition was not met in the first data packet; wherein the initial value of the number of times the condition was not met is set to zero, and is reset to zero after the EGR valve is determined to meet the self-learning condition.

6. The zero-position self-learning method for the EGR valve of the range extender according to claim 5, characterized in that, After the start counter increments the number of failed conditions by one and stores the number of failed conditions in the first data packet, the method further includes: Judgment: When the number of times the condition is not met is greater than or equal to the third set threshold, an alarm message is displayed and the self-learning process is exited; When the number of times the condition is not met is less than the third set threshold, the step of determining whether the EGR valve meets the self-learning condition is repeated.

7. A zero-position self-learning device for an EGR valve in a range extender, characterized in that, include: The condition judgment module is used to determine whether the EGR valve meets the self-learning conditions in response to the key-off command; The control shutdown module is used to determine when the EGR valve meets the self-learning conditions, record the first moment when the self-learning conditions are met; from the first moment, within a first set time, control the valve stem assembly of the EGR valve to move along the closing direction of the EGR valve until the EGR valve is completely closed. A first control module is configured to apply a second control signal to the EGR valve along the spring extension direction within a fourth set time period after the EGR valve is fully closed at a fourth time point; wherein the fourth time point is equal to the first time point plus the first set time period, and the second control signal is a monotonically increasing signal; record the third feedback voltage signal of the EGR valve within the fourth set time period; at a fifth time point, if it is determined that the third feedback voltage signal is within a fourth set threshold range and the second control signal is within a fifth set threshold range, control the second control signal to stop increasing; the fifth time point is equal to the fourth time point plus the fourth set time period; from the fifth time point, reduce the second control signal to zero within the fifth set time period, and take the moment when the second control signal drops to zero as the second time point; from the second time point, apply a first control signal to the EGR valve within the second set time period; record the value of the first control signal within the second set time period, and the first feedback voltage signal of the EGR valve within the second set time period; wherein the first control signal is used to apply a force along the spring compression direction to the valve stem assembly; the first control signal is a monotonically increasing signal; the first feedback voltage signal is used to detect the opening degree of the EGR valve; The voltage detection module is used to stop increasing the first control signal if, within a second set time, the value of the first control signal enters a first preset threshold range and the first feedback voltage signal is within a zero voltage range; and to read the detected voltage value of the first feedback voltage signal of the current EGR valve and use the detected voltage value as the zero voltage value of the EGR valve.

8. A computer device, characterized in that, include: Memory, processor, and a design program for performing EGR valve zero-position self-learning stored in memory; the design program for performing EGR valve zero-position self-learning is configured to: Perform the zero-position self-learning method for the EGR valve of the range extender as described in any one of claims 1-6.

9. A storage medium, characterized in that, The storage medium stores a design program for EGR valve self-learning, which, when executed, is used for: Perform the zero-position self-learning method for the EGR valve of the range extender as described in any one of claims 1-6.

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