Electronic actuator and control method thereof

Abstract

The invention discloses an electronic actuator and a control method thereof, and relates to the technical field of electronic actuators. The control method comprises the following steps: judging whether an engine runs or not, and if so, starting an electronic actuator; performing first fault diagnosis on the starting process of the electronic actuator based on a fault diagnosis interface; if the first fault diagnosis is normal, a PWM signal with the duty ratio of 3%-5% is input to control the valve plate to reset; the angle of the valve plate is adjusted by adjusting the duty ratio of the PWM signal so as to control the air inflow; when the angle of the valve plate is adjusted, second fault diagnosis is carried out through the fault diagnosis interface; if the second fault diagnosis is normal and air intake is completed, the electronic actuator is controlled to be closed, and third fault diagnosis is conducted on the closing process of the electronic actuator based on the fault diagnosis interface; fault diagnosis is carried out on the electronic actuator through the fault diagnosis interface, faults are fed back to the control unit in time when the electronic actuator breaks down, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic actuators, and in particular to an electronic actuator and a control method thereof. Background Art

[0002] Currently, electronic actuators in vehicles are mainly used to control the amount of intake air.

[0003] However, existing actuators usually lack effective self-diagnosis mechanisms and cannot provide timely and accurate feedback to the control system when a fault occurs, affecting performance and safety. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a control method of an electronic actuator, comprising: Determine whether the engine is running, and if so, start the electronic actuator; perform a first fault diagnosis on the electronic actuator start-up process based on the fault diagnosis interface; If the first fault diagnosis is normal, a PWM signal with a duty cycle of 3%-5% is input to control the valve plate to reset; The valve plate angle is adjusted by adjusting the duty cycle of the PWM signal to control the intake air volume; when the valve plate angle is adjusted, a second fault diagnosis is performed through the fault diagnosis interface; If the second fault diagnosis is normal and the air intake is completed, the electronic actuator is controlled to be closed, and a third fault diagnosis is performed on the electronic actuator closing process based on the fault diagnosis interface.

[0005] The first fault diagnosis includes monitoring the duty cycle of the PWM signal during the startup process. If the duration of the duty cycle of the PWM signal being lower than 3% is longer than a first threshold time, a first fault is triggered and fed back to the control unit.

[0006] Among them, if the first fault is triggered, the control unit performs a first frequency monitoring, and the first frequency monitoring includes input voltage monitoring, circuit device monitoring, startup deviation monitoring and H-bridge temperature monitoring; if the input voltage monitoring is abnormal, the control unit obtains a 13.5Hz frequency, if the circuit device monitoring is abnormal, the control unit obtains a 16.5Hz frequency, if the startup deviation monitoring is abnormal, the control unit obtains a 20Hz frequency, and if the H-bridge temperature monitoring is abnormal, the control unit obtains a 70Hz frequency.

[0007] Among them, the second fault diagnosis includes the control unit performing a second frequency monitoring, and the second frequency detection includes operation deviation monitoring and PWM monitoring; if the operation deviation monitoring is abnormal, the control unit obtains a 55Hz frequency, and if the PWM monitoring is abnormal, the control unit obtains a 77Hz frequency; if the second frequency monitoring is normal, the control unit obtains a 10Hz frequency.

[0008] The third fault diagnosis includes monitoring the duty cycle of the PWM signal during the shutdown process. If the duration of the duty cycle of the PWM signal being higher than 98% is longer than a second threshold time, the third fault is triggered and fed back to the control unit.

[0009] Among them, if the third fault is triggered, the control unit performs a third frequency monitoring, and the third frequency monitoring includes shutdown deviation monitoring and ECU link monitoring; if the shutdown deviation monitoring is abnormal, the control unit obtains a 30Hz frequency, and if the ECU link monitoring is abnormal, the control unit obtains a 100Hz frequency.

[0010] The present invention further provides an electronic actuator, to which any of the control methods described above can be applied, the electronic actuator comprising: A fault diagnosis interface, which is used to obtain the working status and PWM signal status of each component of the electronic actuator and output the fault diagnosis result; A control unit is connected to the fault diagnosis interface, the control unit obtains the fault diagnosis result, and controls the working state of the electronic actuator based on the fault diagnosis result.

[0011] Wherein, the control unit further includes a correction module, and the fault diagnosis result is corrected based on the correction module to prevent the control unit from miscontrolling the electronic actuator.

[0012] The present invention further provides an electronic device, comprising: a memory and a processor coupled to each other, wherein the processor is used to execute program instructions stored in the memory to implement any of the control methods described above.

[0013] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores program data, and the program data can be executed by a processor to implement any of the control methods described above.

[0014] Beneficial effects of the invention: Different from the prior art, the invention discloses an electronic actuator and a control method thereof; the control method comprises the following steps: determining whether the engine is running, and starting the electronic actuator if running; performing a first fault diagnosis on the electronic actuator starting process based on a fault diagnosis interface; if the first fault diagnosis is normal, inputting a PWM signal with a duty cycle of 3%-5% to control the valve plate to reset; adjusting the valve plate angle by adjusting the duty cycle of the PWM signal to control the intake volume; performing a second fault diagnosis through the fault diagnosis interface when adjusting the valve plate angle; if the second fault diagnosis is normal and the intake is completed, controlling the electronic actuator to close, and performing a third fault diagnosis on the electronic actuator closing process based on the fault diagnosis interface; performing fault diagnosis on the electronic actuator through the fault diagnosis interface, and providing timely feedback to the control unit when a fault occurs in the electronic actuator to improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic flow chart of a control method for an electronic actuator provided in one embodiment of the present invention; Figure 2 A schematic flow chart of a control method for an electronic actuator provided by another embodiment of the present invention; Figure 3 A schematic diagram of the structure of an electronic actuator provided in one embodiment of the present invention; Figure 4 It is a structural schematic diagram of an embodiment of an electronic device of the present invention; Figure 5 It is a schematic diagram of the structure of an embodiment of a computer-readable storage medium of the present invention. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0017] Electronic actuators control the functions of various mechanical systems by adjusting the position of the output shaft and can be used in vehicles, household appliances, robots and other equipment. For example, electronic actuators are used in vehicles to control the intake volume. The electronic actuator has a built-in motor, which adjusts the current through the chip's PWM bandwidth signal to further control the rocker arm of the output shaft, thereby manipulating the valve plate inside the intake manifold to control the intake volume.

[0018] like Figure 1 As shown, Figure 1 A schematic flow chart of a control method for an electronic actuator provided in an embodiment of the present invention includes the following steps: Step S11: Determine whether the engine is running, and if so, start the electronic actuator; the control system is connected to the engine control unit (ECU), and the ECU provides the working status of the engine; perform a first fault diagnosis on the electronic actuator startup process based on the fault diagnosis interface; during the startup process, the system uses the fault diagnosis interface to monitor the status of the actuator, and if the monitoring result is abnormal, it is considered that a fault exists and the corresponding diagnostic program is triggered.

[0019] Step S12: If the first fault diagnosis is normal, a PWM signal with a duty cycle of 3%-5% is input to control the valve plate to reset; the PWM signal will drive the motor to rotate the output shaft, driving the valve plate in the intake manifold to return to the predetermined initial position to ensure that the intake duct is unobstructed; by setting a PWM signal within a specific range, it can be ensured that the valve plate can return to a known safe position each time the engine is restarted, thereby avoiding intake volume control errors caused by incorrect valve position.

[0020] Step S13: The valve plate angle is adjusted by adjusting the duty cycle of the PWM signal to control the intake volume; the control system determines the required target intake volume according to the engine operating conditions (such as speed, load, etc.), and based on the target intake volume, the control system calculates the corresponding PWM signal duty cycle and sends it to the actuator. The actuator adjusts the motor output according to the received PWM signal to control the position of the valve plate to meet the requirements of engine operation; when adjusting the valve plate angle, the second fault diagnosis is performed through the fault diagnosis interface; by continuously monitoring the status of the actuator, potential faults can be warned in time to prevent safety accidents caused by actuator failures.

[0021] Step S14: If the second fault diagnosis is normal and the air intake is completed, the electronic actuator is controlled to be closed, and a third fault diagnosis is performed on the electronic actuator closing process based on the fault diagnosis interface; by strictly monitoring the closing process, the reliability of the actuator operation can be effectively improved and system failures caused by improper closing can be reduced.

[0022] In summary, the present invention discloses an electronic actuator and a control method thereof; the control method comprises the following steps: determining whether the engine is running, and if so, starting the electronic actuator; performing a first fault diagnosis on the electronic actuator starting process based on a fault diagnosis interface; if the first fault diagnosis is normal, inputting a PWM signal with a duty cycle of 3%-5% to control valve plate reset; adjusting the valve plate angle by adjusting the duty cycle of the PWM signal to control the intake volume; performing a second fault diagnosis through the fault diagnosis interface when adjusting the valve plate angle; if the second fault diagnosis is normal and the intake is completed, controlling the electronic actuator to close, and performing a third fault diagnosis on the electronic actuator closing process based on the fault diagnosis interface; performing fault diagnosis on the electronic actuator through the fault diagnosis interface, and providing timely feedback to the control unit when a fault occurs in the electronic actuator to improve safety.

[0023] like Figure 2 As shown, Figure 2 A flow chart of a control method for an electronic actuator provided for another embodiment of the present invention; in this embodiment, a first fault diagnosis includes monitoring the duty cycle of the PWM signal during the startup process; if the duration of the duty cycle of the PWM signal being lower than 3% is longer than a first threshold time, a first fault is triggered and fed back to a control unit; in this embodiment, the first threshold time is 5s, and in other embodiments, the first threshold time may also be another value, without any limitation herein; after the control unit receives the fault signal, the control unit may send a shutdown signal to control the electronic actuator to shut down; by strictly monitoring the startup process, the actuator failure rate due to signal transmission problems may be effectively reduced, ensuring that the actuator can work normally at the initial startup stage, avoiding abnormal actuator action due to signal instability, and improving the reliability of the system.

[0024] In this embodiment, if the first fault is triggered, the control unit performs a first frequency monitoring, and the first frequency monitoring includes input voltage monitoring, circuit component monitoring, startup deviation monitoring and H-bridge temperature monitoring.

[0025] If the input voltage monitoring is abnormal, the control unit obtains a 13.5 Hz frequency. For example, if the input voltage is detected to be lower than a normal level, a 13.5 Hz frequency signal is obtained.

[0026] If the circuit device is detected to be abnormal, the control unit obtains a frequency of 16.5 Hz, and the circuit devices include but are not limited to sensors, resistors, transistors, etc.; if a device is detected to be damaged, a frequency signal of 16.5 Hz is obtained.

[0027] If the startup deviation monitoring is abnormal, the control unit obtains a 20 Hz frequency. For example, if it is detected that the actual behavior of the actuator deviates greatly from the expected behavior, a 20 Hz frequency signal is obtained.

[0028] If the H-bridge temperature monitoring is abnormal, the control unit obtains a 70Hz frequency. The H-bridge is the part of the actuator used to drive the motor. The temperature of the H-bridge can be obtained through a temperature sensor. The control unit sets a temperature threshold. When the temperature sensor detects that the temperature of the H-bridge is higher than the temperature threshold, it is determined that the H-bridge temperature is too high, and the control unit obtains a 70Hz frequency signal.

[0029] Different frequency signals correspond to different fault types, making fault diagnosis more accurate and quickly locating the problem. After the fault diagnosis is accurate, targeted repairs can be carried out instead of blindly replacing or checking irrelevant parts, which improves maintenance efficiency.

[0030] In this embodiment, the second fault diagnosis includes the control unit performing second frequency monitoring, and the second frequency detection includes operation deviation monitoring and PWM monitoring.

[0031] If the operation deviation monitoring is abnormal, the control unit obtains the 55Hz frequency, that is, during the normal operation of the actuator, the control system continuously monitors whether the actual operation status of the actuator meets the expectations. If it is found that there is a deviation between the actual action of the actuator and the expected action, the operation deviation monitoring is considered abnormal, and the control unit obtains the 55Hz frequency signal.

[0032] If the PWM monitoring is abnormal, the control unit obtains a frequency of 77Hz, that is, the control system also monitors the state of the PWM signal, including the frequency, duty cycle and other parameters of the PWM signal. If it is detected that the PWM signal does not meet the expected standard, the PWM monitoring is considered abnormal, and the control unit obtains a frequency of 77Hz.

[0033] If the second frequency monitoring is normal, the control unit acquires a 10 Hz frequency.

[0034] Through the second frequency monitoring, not only can the actuator be ensured to be in a controlled state throughout the entire working cycle, but also the performance and stability of the entire system can be improved through timely fault feedback.

[0035] In this embodiment, the third fault diagnosis includes monitoring the duty cycle of the PWM signal during the shutdown process. If the duration of the duty cycle of the PWM signal being higher than 98% is longer than the second threshold time, the third fault is triggered and fed back to the control unit.

[0036] In this embodiment, the second threshold time is 5s, which is the same as the first threshold time; it should be noted that in other embodiments, the first threshold time and the second threshold time may also select different time values, and no limitation is made here.

[0037] In this embodiment, if the third fault is triggered, the control unit performs third frequency monitoring, and the third frequency monitoring includes closing deviation monitoring and ECU link monitoring.

[0038] If the closing deviation monitoring is abnormal, the control unit obtains a 30Hz frequency. When the actuator deviates during the closing process, that is, the actual closing state is inconsistent with the expected state, the control unit obtains a 30Hz frequency signal. By closing the deviation monitoring, it can ensure that the position of the actuator is correct when closing, avoiding problems caused by incomplete closing.

[0039] The control unit will also check whether the communication link with the ECU is normal. If the ECU link monitoring is abnormal, the control unit will obtain a 100Hz frequency signal. If the ECU link monitoring is abnormal, the control unit will obtain a 100Hz frequency. ECU link monitoring helps to verify whether the communication between the control system and the actuator is normal, ensuring that the control system can accurately receive and send instructions.

[0040] like Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of an electronic actuator provided in one embodiment of the present invention. The electronic actuator includes a fault diagnosis interface and a control unit.

[0041] The fault diagnosis interface is used to obtain the working status and PWM signal status of each component of the electronic actuator (such as motors, sensors, etc.) and output the fault diagnosis results; the fault diagnosis interface analyzes the collected data and outputs the fault diagnosis results.

[0042] The control unit is connected to the fault diagnosis interface, the control unit obtains the fault diagnosis result, controls the working state of the electronic actuator based on the fault diagnosis result, and issues a control instruction according to the diagnosis result to control the action of the actuator by adjusting the PWM signal, such as adjusting the intake volume, etc. During the entire working cycle of the actuator, the fault diagnosis interface continuously monitors the state of the actuator and repeats the above steps to ensure that the actuator is always in the best working state.

[0043] In summary, electronic actuators can not only perform fault diagnosis at various stages such as startup, operation, and shutdown, but can also adjust their own status in a timely manner to ensure stable and reliable operation of the actuator.

[0044] In one embodiment, the control unit further includes a correction module (not shown), which corrects the fault diagnosis result based on the correction module to prevent the control unit from miscontrolling the electronic actuator.

[0045] After receiving the fault diagnosis result, the correction module in the control unit corrects the diagnosis result. The correction module checks the rationality and corrects the diagnosis result through preset algorithms or rules. If the corrected diagnosis result is found to have the possibility of misdiagnosis, it will be corrected. The control unit makes a control decision based on the corrected fault diagnosis result to decide whether and how to adjust the working state of the actuator.

[0046] By correcting the diagnostic results, the overall reliability of the system can be improved and system instability due to miscontrol can be avoided. Accurate fault diagnosis and reasonable control strategies can ensure that the actuator is always in a safe working state and reduce safety hazards.

[0047] For the above embodiment, the present invention provides an electronic device, see Figure 4 , Figure 4 The electronic device of the present invention comprises a memory and a processor, wherein the memory and the processor are coupled to each other, the memory stores program data, and the processor is used to execute the program data to implement the steps of any embodiment of the above-mentioned electronic actuator control method.

[0048] In this embodiment, the processor may also be referred to as a CPU (Central Processing Unit). The processor may be an integrated circuit chip having signal processing capabilities. The processor may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0049] The method of the above embodiment can be implemented in the form of a computer program, so the present invention provides a computer readable storage medium, see Figure 5 , Figure 5 The structure diagram of an embodiment of a computer-readable storage medium of the present invention is shown in FIG. The computer-readable storage medium stores program data that can be run by a processor, and the program data can be executed by the processor to implement the steps of any embodiment of the above-mentioned electronic actuator control method.

[0050] The computer-readable storage medium in this embodiment may be a medium that can store program data, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or may be a server that stores the program data. The server may send the stored program data to other devices for execution, or may execute the stored program data by itself.

[0051] The above are only implementation methods of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for an electronic actuator, characterized in that: include: Determine whether the engine is running, and if so, start the electronic actuator; Performing a first fault diagnosis on the electronic actuator startup process based on a fault diagnosis interface; If the first fault diagnosis is normal, a PWM signal with a duty cycle of 3%-5% is input to control the valve plate to reset; The valve plate angle is adjusted by adjusting the duty cycle of the PWM signal to control the intake air volume; when the valve plate angle is adjusted, a second fault diagnosis is performed through the fault diagnosis interface; If the second fault diagnosis is normal and the air intake is completed, the electronic actuator is controlled to be closed, and a third fault diagnosis is performed on the electronic actuator closing process based on the fault diagnosis interface.

2. The control method according to claim 1, characterized in that: The first fault diagnosis includes monitoring the duty cycle of the PWM signal during the startup process. If the duration of the duty cycle of the PWM signal being lower than 3% is longer than a first threshold time, a first fault is triggered and fed back to the control unit.

3. The control method according to claim 2, characterized in that: If the first fault is triggered, the control unit performs a first frequency monitoring, which includes input voltage monitoring, circuit device monitoring, startup deviation monitoring and H-bridge temperature monitoring; if the input voltage monitoring is abnormal, the control unit obtains a 13.5Hz frequency; if the circuit device monitoring is abnormal, the control unit obtains a 16.5Hz frequency; if the startup deviation monitoring is abnormal, the control unit obtains a 20Hz frequency; if the H-bridge temperature monitoring is abnormal, the control unit obtains a 70Hz frequency.

4. The control method according to claim 3, characterized in that: The second fault diagnosis includes the control unit performing a second frequency monitoring, and the second frequency detection includes operation deviation monitoring and PWM monitoring; if the operation deviation monitoring is abnormal, the control unit obtains a 55Hz frequency, and if the PWM monitoring is abnormal, the control unit obtains a 77Hz frequency; if the second frequency monitoring is normal, the control unit obtains a 10Hz frequency.

5. The control method according to claim 4, characterized in that: The third fault diagnosis includes monitoring the duty cycle of the PWM signal during the shutdown process. If the duration of the duty cycle of the PWM signal being higher than 98% is longer than a second threshold time, the third fault is triggered and fed back to the control unit.

6. The control method according to claim 5, characterized in that: If the third fault is triggered, the control unit performs a third frequency monitoring, and the third frequency monitoring includes closing deviation monitoring and ECU link monitoring; if the closing deviation monitoring is abnormal, the control unit obtains a 30Hz frequency, and if the ECU link monitoring is abnormal, the control unit obtains a 100Hz frequency.

7. An electronic actuator, to which the control method according to any one of claims 1 to 6 can be applied, characterized in that: The electronic actuator comprises: A fault diagnosis interface, which is used to obtain the working status and PWM signal status of each component of the electronic actuator and output the fault diagnosis result; A control unit is connected to the fault diagnosis interface, the control unit obtains the fault diagnosis result, and controls the working state of the electronic actuator based on the fault diagnosis result.

8. The electronic actuator according to claim 7, characterized in that: The control unit further includes a correction module, which corrects the fault diagnosis result based on the correction module to prevent the control unit from miscontrolling the electronic actuator.

9. An electronic device, characterized in that: The electronic device comprises: a memory and a processor coupled to each other, wherein the processor is used to execute program instructions stored in the memory to implement the control method according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program data, and the program data can be executed by a processor to implement the control method according to any one of claims 1 to 6.

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