A method and system for detecting the hysteresis of an oil quantity actuator

Abstract

The present invention discloses a method and system for detecting the hysteresis of an oil quantity actuator, designs a method and an automated device for detecting the hysteresis of the oil quantity actuator, and realizes the automatic control of the entire detection process; the electronic control unit is used to control the oil quantity actuator, and based on the electronic control unit, the hysteresis performance of the oil quantity actuator during the rise and fall of the driving voltage is monitored, that is, the hysteresis performance of the actuator during the opening and closing of the oil quantity actuator based on the driving voltage is monitored. At the same time, the feedback voltage of the oil quantity actuator is collected and transmitted to the PC host computer, the host computer analyzes the data to draw a hysteresis curve, and determines the image according to the standard parameters, and finally completes the collection of detection data and logs based on the MYSQL database. The present invention provides a detection device and method that can efficiently, conveniently and automatically control the hysteresis characteristics of the outgoing actuators within a certain range during the production process, ensuring the qualified rate of product quality and saving production time and reducing production costs.

Description

Technical Field

[0001] The present invention belongs to the field of device detection, and particularly relates to a method and system for detecting the hysteresis of an oil quantity actuator. Background Art

[0002] The oil quantity actuator hysteresis detection device is a special device for detecting the hysteresis characteristics of the actuator in the fuel system, and plays an important role in the quality control of the manufacturing and production of actuators and oil pumps. In recent years, with the increasingly wide application of diesel engines, the oil pump manufacturers have higher and higher requirements for the performance of actuators.

[0003] The oil quantity actuator is one of the core components of the electronically controlled distributor pump, which directly controls the fuel injection quantity of the diesel engine. At present, the manufactured actuators all adopt electromagnetic force drive, so there is a hysteresis phenomenon, that is, there is a lag in the opening corresponding to the same voltage during the rising process and the falling process of the drive voltage. Excessive hysteresis will cause a large deviation in the controlled injection quantity of the fuel system. The traditional actuator hysteresis detection equipment is cumbersome to operate and does not realize electronic control, so multiple manual operation interventions are required during production and use. And due to the relatively early design time, the collection and collation of production data are usually not ignored, which causes difficulties for subsequent fault analysis. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to detect the hysteresis phenomenon of the oil quantity actuator.

[0005] To solve the above technical problem, the present invention adopts the following technical solutions:

[0006] An oil quantity actuator hysteresis detection method, for an oil quantity actuator, the following steps are executed to realize the detection of the hysteresis performance of the oil quantity actuator and judge whether the control linearity of the oil quantity actuator is qualified:

[0007] Step A: Based on a preset drive period and driving force step size, control the oil quantity actuator to perform an opening and closing process of the oil quantity actuator with the driving force increasing from small to large and then from large to small at a preset opening step size in a periodic driving manner;

[0008] Step B: For the opening and closing process of the oil quantity actuator, collect the position voltage corresponding to the position of the ball head of the oil quantity actuator in real time, and then construct response curves of the driving force percentage and the ball head position voltage corresponding to the oil quantity actuator during the opening and closing processes respectively;

[0009] Step C: Based on the response curves of the driving force percentage and the ball head position voltage corresponding to the oil quantity actuator during the opening and closing processes respectively, detect the hysteresis performance of the oil quantity actuator, and then judge whether the control linearity of the oil quantity actuator is qualified.

[0010] Preferably, in step C, the following steps are specifically executed to detect the hysteresis performance of the fuel quantity actuator and determine whether the control linearity of the fuel quantity actuator is qualified:

[0011] Step C1: Based on the response curves of the driving force percentage and the ball head position voltage corresponding to the opening and closing processes of the fuel quantity actuator respectively, obtain the preset characteristic values in the curves; the preset characteristic values include: the position voltage at the maximum opening degree in the opening process, the position voltage at the minimum opening degree in the closing process, the difference between the driving force percentage at the position of the maximum opening degree in the opening process and the driving force percentage corresponding to the first cycle in the closing process, and the driving force percentage at the position of the maximum opening degree in the opening process;

[0012] Step C2: Based on the curve and the preset characteristic values in the curve, combined with the preset thresholds corresponding to the preset characteristic values respectively, realize the detection of the hysteresis performance of the fuel quantity actuator and determine whether the control linearity of the fuel quantity actuator is qualified.

[0013] Preferably, in step C2, based on the curve, the preset characteristic values in the curve, and the preset thresholds corresponding to the preset characteristic values respectively, the detection of the hysteresis performance of the fuel quantity actuator is as follows. If the following conditions are met simultaneously, the control linearity of the fuel quantity actuator is qualified; otherwise, the control linearity of the fuel quantity actuator is unqualified, that is, the fuel quantity actuator is unqualified:

[0014] a. Multiply the position voltage sequence V(i) with a position voltage less than the preset voltage in the response curves corresponding to the opening and closing processes by -1 respectively to obtain the position voltage sequence V'(i), and perform a convolution operation on the position voltage sequence V'(i) and the template The result is greater than the first preset threshold;

[0015] b. The position voltage at the maximum opening degree in the opening process belongs to the first preset threshold interval;

[0016] c. The position voltage at the minimum opening degree in the closing process belongs to the second preset threshold interval;

[0017] d. The difference between the driving force percentage at the position of the maximum opening degree in the opening process and the driving force percentage corresponding to the first cycle in the closing process is less than the first preset percentage threshold;

[0018] e. The driving force percentage at the position of the maximum opening degree in the opening process is less than the second preset percentage threshold.

[0019] An oil quantity actuator hysteresis detection system, which is applied to the above-mentioned oil quantity actuator hysteresis detection method, includes a host computer, an electronic control unit, and at least one oil quantity actuator. For each oil quantity actuator respectively: the host computer outputs a preset driving period, a driving force step length corresponding to the oil quantity actuator, and a preset opening degree step length control signal to the electronic control unit. The electronic control unit outputs a driving voltage based on the preset driving period, the driving force step length corresponding to the oil quantity actuator, and the preset opening degree step length control signal to control the opening and closing process of the oil quantity actuator. And the electronic control unit collects the position voltage corresponding to the ball head position of the oil quantity actuator in real time and transmits it to the host computer. The host computer constructs response curves of the driving force percentage corresponding to the oil quantity actuator in the opening and closing processes and the ball head position voltage based on the opening degree position voltage of the oil quantity actuator, and detects the hysteresis performance of the oil quantity actuator to judge whether the control linearity of the oil quantity actuator is qualified.

[0020] Preferably, the electronic control unit includes an MCU control module and a low-side drive module. The MCU control module converts the preset driving period, the driving force step length corresponding to the oil quantity actuator, and the preset opening degree step length control signal into a PWM driving signal and inputs it to the low-side drive module. The low-side drive module outputs a driving voltage based on the PWM driving signal to control the opening and closing process of the oil quantity actuator. And the MCU control module collects the position voltage corresponding to the ball head of the oil quantity actuator in real time and transmits it to the host computer.

[0021] Preferably, the low-side drive module includes resistors R1-R12, capacitors C1-C7, diodes D1-D2, NOR logic gate U1, NOR logic gate U2, amplifier U3, amplifier U4, MOS transistor Q1, and a storage battery. The PWM drive signal output by the MCU control module is connected to the first input terminal of NOR logic gate U1. The second input terminal of NOR logic gate U1 is grounded. The output terminal of NOR logic gate U1 is connected to the first input terminal of NOR logic gate U2. The second input terminal of NOR logic gate U2 is grounded. The output terminal of NOR logic gate U2 is connected to the gate of MOS transistor Q1 via resistor R1. The source of MOS transistor Q1 is respectively connected to one end of resistor R2 and resistor R3. The other end of resistor R3 is respectively connected to one end of capacitor C4, one end of resistor R5, and the non-inverting input terminal of amplifier U4. The other end of resistor R2 is connected to the inverting input terminal of amplifier U4 via resistor R4. And a parallel combination of resistor R6 and capacitor C5 is connected between the inverting input terminal and the output terminal of amplifier U4. The output terminal of the amplifier is also respectively connected to one end of resistor R7, capacitor C7, and resistor R11. The other ends of resistor R2, capacitor C4, resistor R5, resistor R7, and capacitor C7 are grounded. The other end of resistor R11 is respectively connected to one end of resistor R9 and the non-inverting input terminal of amplifier U3. The inverting input terminal of amplifier U3 is grounded via resistor R12. And a resistor R10 is connected between the inverting input terminal and the output terminal of amplifier U3. The output terminal of amplifier U3 is also respectively connected to the positive electrode of diode D2, one end of capacitor C6, and the low-side diagnostic protection signal via resistor R8. The negative electrode of diode D2 is connected to VCC. The other ends of capacitor C6 and resistor R9 are grounded. The drain of MOS transistor Q1 serves as the output terminal of the low-side drive module to output a drive voltage to control the opening and closing process of the fuel actuator. And the drain of MOS transistor Q1 is respectively connected to the positive electrode of diode D1, one end of capacitor C3, and the positive electrode of the storage battery. The negative electrode of diode D1 is respectively connected to one end of capacitor C1, capacitor C2, and the positive electrode of the storage battery. The other ends of capacitor C1, capacitor C2, and capacitor C3 are grounded.

[0022] Preferably, the host computer combines a single-chip microcomputer with a PL2303 interface converter to convert the USB interface into a UART interface and connect it to the MCU control module.

[0023] Preferably, it further includes a preset database for collecting and storing data.

[0024] Preferably, the preset database adopts a MYSQL database.

[0025] An oil actuator hysteresis detection terminal includes a memory and a processor, which communicate with each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the oil actuator hysteresis detection method.

[0026] The beneficial effects of the present invention are as follows: The present invention provides a method and system for detecting the hysteresis of an oil quantity actuator, designs a method and automated equipment for detecting the hysteresis of the oil quantity actuator, and realizes the automated control of the entire detection process; based on the MYSQL database, functions such as the collection of production data and log recording are realized, and it is a new type of detection equipment with human-machine integration, automation, and intelligence. And the present invention supports online operation, which better meets the needs of the development of big data than the offline equipment on the market, can batch change the production parameters in multiple devices to make the production standards more controllable, and the automated detection method also reduces the production man-hours, weakens the subjective factors of workers, and improves the product quality compared with the semi-automated equipment in the current market. The present invention provides a detection equipment and method that can efficiently, conveniently, and automatically control the hysteresis characteristics of the factory actuator within a certain range during the production process, ensure the qualified rate of product quality, and save production time and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a block diagram of the oil quantity actuator hysteresis detection system of the present invention;

[0028] Figure 2 It is a block diagram of the multi-oil quantity actuator hysteresis detection system in the embodiment of the present invention;

[0029] Figure 3 It is a response curve diagram corresponding to the opening and closing processes of the oil quantity actuator in the embodiment of the present invention;

[0030] Figure 4 It is a circuit diagram of the low-side drive module in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be further described below with reference to the accompanying drawings. The following embodiments can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way.

[0032] A method for detecting the hysteresis of an oil quantity actuator, for the oil quantity actuator, the following steps are executed to realize the detection of the hysteresis performance of the oil quantity actuator and judge whether the control linearity of the oil quantity actuator is qualified.

[0033] Step A: Based on a preset driving period and driving force step size (PWM duty cycle), control the oil quantity actuator to perform the opening and closing process of the oil quantity actuator with the driving force from small to large and then from large to small at a preset opening step size in a periodic driving manner.

[0034] Specifically, the fuel quantity actuator operates in a periodic drive mode with a preset opening step size, and the driving force increases from small to large and then from large to small, that is, the fuel quantity actuator undergoes a process of closing, opening, and then closing again once. Since the accuracy of the driving force percentage matching the engine fuel quantity control is 1%, a standard higher than the control accuracy is used, and the actuator is driven from the minimum position to the maximum position with an opening step size of 0.5%, that is, the opening process of the fuel quantity actuator; then it returns from the maximum position to the minimum position, that is, the closing process of the fuel quantity actuator.

[0035] Step B: For the opening and closing process of the fuel quantity actuator, the position voltage corresponding to the position of the ball head of the fuel quantity actuator is collected in real time. The position voltage corresponding to the position of the ball head of the fuel quantity actuator can be collected through a Hall sensor, and the response change of the position voltage under the change of the driving force is collected. Furthermore, the response curves of the driving force percentage and the ball head position voltage corresponding to the opening and closing processes of the fuel quantity actuator are constructed. As Figure 3 shown.

[0036] Step C: Based on the response curves of the driving force percentage and the ball head position voltage corresponding to the opening and closing processes of the fuel quantity actuator respectively, the hysteresis performance of the fuel quantity actuator is detected, and then it is judged whether the control linearity of the fuel quantity actuator is qualified.

[0037] In the above-mentioned Step C, the following steps are specifically executed to detect the hysteresis performance of the fuel quantity actuator and judge whether the control linearity of the fuel quantity actuator is qualified.

[0038] Step C1: Based on the response curves of the driving force percentage and the ball head position voltage corresponding to the opening and closing processes of the fuel quantity actuator respectively, the preset characteristic values in the curves are obtained; the preset characteristic values include: the position voltage at the maximum opening in the opening process, that is, the maximum position voltage of L1 in the figure; the position voltage at the minimum opening in the closing process, that is, the minimum position voltage of L2 in the figure; the difference between the driving force percentage at the maximum opening position in the opening process and the driving force percentage corresponding to the first cycle in the closing process, that is, the difference between the driving force percentage at the stable maximum opening in the opening process and the driving force percentage at which the actual mechanical action starts from the stable maximum opening position in the closing process, referring to the duty cycle difference at the maximum positions of L1 and L2 in the figure; the driving force percentage at the maximum opening position in the opening process, that is, the duty cycle at the maximum position of L1 in the figure. As Figure 3 shown, L1 is the curve corresponding to the opening process of the fuel quantity actuator; L2 is the curve corresponding to the closing process of the fuel quantity actuator;.

[0039] Step C2: Based on the curve and the preset characteristic values in the curve, combined with the preset thresholds corresponding to the preset characteristic values respectively, the hysteresis performance of the fuel quantity actuator is detected, and it is judged whether the control linearity of the fuel quantity actuator is qualified.

[0040] In step C2, based on the curve and the preset characteristic values in the curve, preset the preset thresholds corresponding to the respective characteristic values, and perform the detection of the hysteresis performance of the fuel actuator as follows. If the following conditions are met simultaneously, the control linearity of the fuel actuator is qualified; otherwise, the control linearity of the fuel actuator is unqualified, that is, the fuel actuator is unqualified.

[0041] The conditions are as follows: a. Multiply the position voltage sequence V(i) with a position voltage less than the preset voltage in the response curves corresponding to the opening and closing processes by -1 respectively to obtain the position voltage sequence V'(i), and perform a convolution operation on the position voltage sequence V'(i) and the template The result is greater than the first preset threshold, where i refers to each data in the voltage sequence, as Figure 3 shown; specifically: Multiply the points in the position voltage sequence V(i) of the curves corresponding to the opening and closing processes that are less than 2400 mV by -1 to convert them into negative numbers, obtaining a new sequence V'(i), and perform a convolution operation on V'(i) and the template The result needs to be greater than 10000.

[0042] b. The position voltage at the maximum opening in the opening process belongs to the first preset threshold interval; specifically: The position voltage at the maximum opening in the opening process is greater than 4300 mV and less than 4800 mV.

[0043] c. The position voltage at the minimum opening in the closing process belongs to the second preset threshold interval; specifically: The position voltage at the minimum opening in the closing process is greater than 600 mV and less than 800 mV.

[0044] d. The difference between the driving force percentage at the maximum opening position in the opening process and the driving force percentage corresponding to the first cycle in the closing process is less than the first preset percentage threshold; specifically: The difference between the driving force percentage at the maximum opening position in the opening process and the driving force percentage corresponding to the first cycle in the closing process is less than 7%.

[0045] e. The driving force percentage at the maximum opening position in the opening process is less than the second preset percentage threshold; specifically: The driving force percentage at the maximum opening position in the opening process is less than 37%.

[0046] The fuel quantity actuator is one of the core components of the electronically controlled distributor pump, which directly controls the fuel injection quantity of the diesel engine. At present, there is a lag in the opening degree corresponding to the same voltage during the rising process and the falling process of the driving voltage of the fuel quantity actuator. Excessive hysteresis will cause a large deviation in the controlled injection quantity of the fuel system. In order to automatically eliminate the actuators with excessive hysteresis during the production process and ensure the consistency of the performance of the actuators leaving the factory, an automated device for detecting the hysteresis of the fuel quantity actuator is designed. The specific system of this solution is as described below and consists of an actuator, an electronic control unit, a communication link, a PC host computer, etc. The electronic control unit drives the actuator from the minimum position to the maximum position and then back from the maximum position to the minimum position at a 0.5% opening degree step, while reading the position feedback voltage of the actuator and sending it to the host computer through the communication link. The host computer draws a curve and judges whether the curve is qualified or unqualified. In this solution, the PC host computer is used as the host computer.

[0047] A fuel quantity actuator hysteresis detection system is applied to the above-mentioned fuel quantity actuator hysteresis detection method. As Figure 1 shown, it includes a host computer, an electronic control unit, and at least one fuel quantity actuator. For each fuel quantity actuator respectively: the host computer outputs a preset driving cycle, a driving force step, and a preset opening degree step control signal corresponding to the fuel quantity actuator to the electronic control unit. The electronic control unit outputs a driving voltage based on the preset driving cycle, driving force step, and preset opening degree step control signal corresponding to the fuel quantity actuator to control the opening and closing process of the fuel quantity actuator. And the electronic control unit collects the position voltage corresponding to the ball head position of the fuel quantity actuator in real time and transmits it to the host computer. The host computer constructs response curves of the driving force percentage and the ball head position voltage corresponding to the fuel quantity actuator during the opening and closing processes respectively based on the opening degree position voltage of the fuel quantity actuator, and detects the hysteresis performance of the fuel quantity actuator to judge whether the control linearity of the fuel quantity actuator is qualified.

[0048] The electronic control unit includes an MCU control module and a low-side drive module. The MCU control module converts the preset driving cycle, driving force step, and preset opening degree step control signal corresponding to the fuel quantity actuator into a PWM driving signal and inputs it to the low-side drive module. The low-side drive module outputs a driving voltage based on the PWM driving signal to control the opening and closing process of the fuel quantity actuator. And the MCU control module collects the position voltage corresponding to the ball head of the fuel quantity actuator in real time and transmits it to the host computer. The host computer is connected to the MCU control module through a self-made CAN communication component.

[0049] As Figure 4As shown, the low-side drive module includes resistors R1 - R12, capacitors C1 - C7, diodes D1 - D2, NOR logic gate U1, NOR logic gate U2, amplifier U3, amplifier U4, MOS transistor Q1, and a storage battery. The PWM drive signal output by the MCU control module is connected to the first input terminal of NOR logic gate U1. The second input terminal of NOR logic gate U1 is grounded. The output terminal of NOR logic gate U1 is connected to the first input terminal of NOR logic gate U2. The second input terminal of NOR logic gate U2 is grounded. The output terminal of NOR logic gate U2 is connected to the gate of MOS transistor Q1 via resistor R1. The source of MOS transistor Q1 is respectively connected to one end of resistor R2 and resistor R3. The other end of resistor R3 is respectively connected to one end of capacitor C4, one end of resistor R5, and the non-inverting input terminal of amplifier U4. The other end of resistor R2 is connected to the inverting input terminal of amplifier U4 via resistor R4. And a parallel combination of resistor R6 and capacitor C5 is connected between the inverting input terminal and the output terminal of amplifier U4. The output terminal of the amplifier is also respectively connected to one end of resistor R7, capacitor C7, and resistor R11. The other ends of resistor R2, capacitor C4, resistor R5, resistor R7, and capacitor C7 are grounded. The other end of resistor R11 is respectively connected to one end of resistor R9 and the non-inverting input terminal of amplifier U3. The inverting input terminal of amplifier U3 is grounded via resistor R12. And a resistor R10 is connected between the inverting input terminal and the output terminal of amplifier U3. The output terminal of amplifier U3 is also respectively connected to the positive electrode of diode D2, one end of capacitor C6, and the low-side diagnostic protection signal via resistor R8. The negative electrode of diode D2 is connected to VCC. The other ends of capacitor C6 and resistor R9 are grounded. The drain of MOS transistor Q1 serves as the output terminal of the low-side drive module to output a drive voltage to control the opening and closing process of the fuel actuator. And the drain of MOS transistor Q1 is respectively connected to the positive electrode of diode D1, one end of capacitor C3, and the positive electrode of the storage battery. The negative electrode of diode D1 is respectively connected to one end of capacitor C1, capacitor C2, and the positive electrode of the storage battery. The other ends of capacitor C1, capacitor C2, and capacitor C3 are grounded. Vcc is a 5V voltage, and the storage battery provides a 12V or 24V voltage.

[0050] The host computer is connected to the MCU control module through a self-made CAN communication component. The self-made CAN communication component uses a single-chip microcomputer combined with a PL2303 interface converter to convert the USB interface into a UART interface and connect it to the MCU control module. That is, the single-chip microcomputer converts the USB interface into a CAN interface, and the PL2303 interface converter converts the CAN interface into a UART interface. The MCU serves as the automatic control core, responsible for parsing the frame message in the ISO15031 format received by the CAN communication component, obtaining the opening degree of the actuator that the PC host computer expects to control from the message, and converting the opening degree data into a PWM drive signal and inputting it into the bottom drive circuit to generate a drive voltage that can be controlled by the duty cycle, so as to control the fuel quantity to the corresponding position. On the other hand, the fuel quantity actuator will return the current position in the form of a feedback voltage. The ADC module of the MCU controller will collect the position feedback voltage in real time and send the position data to the PC host computer in the ISO15031 message format as well.

[0051] In this embodiment, the message format is as follows:

[0052] / / Set the drive duty cycle

[0053] Command code: B0 0B 02 00 OilPWMDutyHi OilPWMDutyLo checksum

[0054] Response: F0 0B ErrCode

[0055] ErrCode:

[0056] 0x00: Set the output.

[0057] 0x01: Disable the output.

[0058] 0x02: Return an error.

[0059] / / Read the position feedback voltage

[0060] Command code: 01 5C

[0061] Response: 41 5C VolHi VolLo.

[0062] The PC host computer sends a command to set the drive duty cycle at the time interval of the drive period, so that the driving force percentage changes from small to large and then from large to small according to the preset drive step. At the same time, before the (n + 1)th drive cycle, it sends a command to read the position feedback voltage to obtain the feedback voltage of the Hall sensor of the fuel quantity actuator after the drive in the nth cycle, stores it in the form of coordinates (x-axis: driving force percentage, y-axis: actuator position feedback position voltage), and draws a hysteresis curve based on the coordinates, as Figure 3As shown. The determination of the image is relatively complex. To accelerate the judgment process, we use convolution operations to accelerate the responsiveness judgment, that is, perform a threshold flipping process on the feedback voltage sequence V(i). The points less than 2400 mV are multiplied by -1 to be converted into negative numbers, obtaining a new sequence V’(i). Perform a convolution operation on V’(i) and the template {-1, -1, 0, 0, 0, 0, 0, 1, 1}. If the result is greater than 10000, it meets the responsiveness requirement; otherwise, it does not. And four eigenvalues in the image are selected for linearity judgment: the difference between the driving force percentage at the maximum opening position during the opening process and the driving force percentage corresponding to the first cycle during the closing process, that is, the duty cycle difference at the maximum positions of L1 and L2 in the figure; the driving force percentage at the maximum opening position during the opening process, that is, the duty cycle at the maximum position of L1 in the figure. As Figure 3 shown, L1 is the curve corresponding to the fuel actuator during the opening process; L2 is the curve corresponding to the fuel actuator during the closing process. Based on the above four eigenvalues in the selected area, they can best reflect the linear characteristics of hysteresis.

[0063] The conditions that the above four eigenvalues need to meet are as follows: a. Multiply the position voltage sequence V(i) where the position voltage is less than the preset voltage in the response curves corresponding to the opening and closing processes by -1 respectively to obtain the position voltage sequence V’(i). Perform a convolution operation on the position voltage sequence V’(i) and the template {-1, -1, 0, 0, 0, 0, 0, 1, 1}, and the result is greater than the first preset threshold; specifically: multiply the points less than 2400 mV in the position voltage sequence V(i) of the curves corresponding to the opening and closing processes by -1 to be converted into negative numbers, obtaining a new sequence V’(i). Perform a convolution operation on V’(i) and the template {-1, -1, 0, 0, 0, 0, 0, 1, 1}, and the result needs to be greater than 10000. b. The position voltage at the maximum opening during the opening process belongs to the first preset threshold interval; specifically: the position voltage at the maximum opening during the opening process is greater than 4300 mV and less than 4800 mV. c. The position voltage at the minimum opening during the closing process belongs to the second preset threshold interval; specifically: the position voltage at the minimum opening during the closing process is greater than 600 mV and less than 800 mV. d. The difference between the driving force percentage at the maximum opening position during the opening process and the driving force percentage corresponding to the first cycle during the closing process is less than the first preset percentage threshold; specifically: the difference between the driving force percentage at the maximum opening position during the opening process and the driving force percentage corresponding to the first cycle during the closing process is less than 7%. e. The driving force percentage at the maximum opening position during the opening process is less than the second preset percentage threshold; specifically: the driving force percentage at the maximum opening position during the opening process is less than 37%.

[0064] A fuel actuator hysteresis detection system further includes a preset database for collecting and storing data. The preset database uses a MYSQL database.

[0065] The preset database uses the MYSQL database to collect and store data. As a lightweight database, the MYSQL database uses fully multithreaded core threads and supports multi-processors. It implements SQL function libraries through a highly optimized class library and is as fast as they can be. Generally, there should be no memory allocation after query initialization. There are no memory leaks. It fully supports the GROUP BY and ORDER BY clauses of SQL and supports aggregate functions. It is cross-platform compatible with windows / linux. And the MYSQL database can store a large amount of data with less occupied space. As the volume of the upper computer software written (such as detection equipment, etc.) increases, whether it is text, pictures or videos, multimedia information needs to be stored using a database, and the storage volume is very large. It greatly reduces data redundancy, making the space occupied by stored data less. Management operations are convenient, fast, and efficient. In the use of production software, it can effectively prevent production records from being tampered with. At the same time, the storage process based on the database simplifies the compliance of the upper computer software and shortens the development cycle. Retrieval and statistics are accurate, rapid, and efficient. The use of the Mysql database application system can classify data by keywords in various ways, and the keywords can also be combined in various ways, making the operations of data retrieval, statistics, etc. diverse and the results accurate. The production software written based on the Mysq database can retrieve, trace, analyze and count parameters such as the production process, defective product rate, and unit time. Based on the Mysq data, big data of product production can be realized, which plays a key role in optimizing the production process and migrating the production process. The data application has good sharing. Due to the centralized management of data, through various technologies such as the network, the data application can be shared, and the efficiency of the data application is also high. Based on the Mysql database, R & D personnel can monitor the production process in real time, discover production filling and testing problems in time, so as to stop or correct the operation errors of the processing factory in time and reduce the rework rate.

[0066] Based on the MYSQL database, by establishing a storage process and using the pump number as an index, we store production data in a table, realizing the digitization and traceability of the production process. The operation of traditional actuator hysteresis detection equipment is cumbersome and not electrically controlled, so multiple manual operation interventions are required during production use. And because it was designed earlier, the collection and collation of production data are usually not ignored, which causes difficulties for subsequent fault analysis. The equipment of this patent uses an electronic control unit to achieve automatic control of the actuator opening, and based on the MYSQL database, it provides a management center for detection data, which can facilitate big data analysis and problem tracing.

[0067] An oil quantity actuator hysteresis detection terminal, comprising a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the oil quantity actuator hysteresis detection method.

[0068] Based on the above solution, this solution can be applied to the ZXQ-32-bit oil quantity actuator. As the production process progresses, the production parameter standards will also be adjusted accordingly. Similar products on the market are offline devices, so they do not have the function of batch modification of production parameters. When the parameters change, they can only be modified one by one manually, which not only increases the time cost but also easily leads to errors due to manual participation. The patented device of the present invention adopts an online operation mode, and each device is connected by a local area network. Each parameter is stored on the server side. Only by modifying it on the server side can batch changes of multiple devices be realized, as Figure 2 shown. In the present invention, the production parameters that can be batch-changed in multiple devices include: drive cycle, driving force duty ratio range, driving force duty ratio step, position voltage at which the stable maximum opening degree is reached during the opening process, position voltage at which the stable minimum opening degree is reached during the closing process, driving force percentage at which the stable maximum opening degree is first reached during the opening process, and the difference between the driving force percentage at which the actual mechanical action first occurs starting from the stable maximum opening degree position during the closing process, the driving percentage required to reach the stable maximum opening degree position for the first time during the opening process, etc. Among them, the drive cycle, driving force duty ratio range, and driving force duty ratio step need to be adjusted accordingly according to the engine oil quantity control accuracy of different manufacturers, making the production standards more controllable and more universal. The automated detection method also reduces production man-hours, weakens the subjective factors of workers, and improves product quality compared with the semi-automated devices in the current market. The present invention provides a detection device and method that can efficiently, conveniently, and automatically control the hysteresis characteristics of the factory-executed actuator within a certain range during the production process, as well as ensure the qualified rate of product quality and save production time and reduce production costs.

[0069] This solution aims to provide a human-machine integrated intelligent actuator hysteresis detection device and method with functions such as automatic hysteresis curve drawing and determination of the fuel quantity actuator, logging, and batch modification of production parameters of multiple devices. During the production process, it can efficiently, conveniently, and automatically control the detection device for the hysteresis characteristics of the outgoing actuators within a certain range, ensure the qualified rate of product quality, and save production time and reduce production costs. Specifically, an electronic control unit is used to control the fuel quantity actuator, and based on the electronic control unit, the hysteresis performance of the fuel quantity actuator during the rise and fall of the drive voltage is monitored, that is, the hysteresis performance of the actuator is monitored based on the drive voltage during the opening and closing of the fuel quantity actuator. At the same time, the feedback voltage of the fuel quantity actuator is collected and sent to the PC host computer. The host computer analyzes the data to draw the hysteresis curve and determines the image according to the standard parameters. Finally, the detection data and logs are collected based on the MYSQL database. Finally, a human-machine integrated, automated, and intelligent fuel quantity actuator hysteresis characteristic detection device is realized. Combining with the PC host computer software based on the MYSQL database to complete functions such as automatic testing, synchronization of production parameters of multiple devices, curve drawing, data recording, and analysis. A human-machine integrated, automated, and intelligent fuel quantity actuator hysteresis detection device is realized, which brings guarantee for more efficient, accurate, and data-driven production.

[0070] The above are only the preferred embodiments of the present invention, but do not limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structure made by using the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, is similarly within the scope of the patent protection of the present invention.

Claims

1. A method for detecting the hysteresis of an oil quantity actuator, characterized in that: For the fuel quantity actuator, perform the following steps to detect the hysteresis performance of the fuel quantity actuator and determine whether the control linearity of the fuel quantity actuator is qualified: Step A: Based on a preset driving cycle and driving force step size, control the fuel quantity actuator to perform the opening and closing process of the fuel quantity actuator with the driving force increasing from small to large and then decreasing from large to small at a preset opening step size in a periodic driving manner; Step B: For the opening and closing process of the fuel quantity actuator, collect the position voltage corresponding to the ball head position of the fuel quantity actuator in real time, and then construct response curves of the driving force percentage and the ball head position voltage corresponding to the opening and closing processes of the fuel quantity actuator respectively; Step C: Based on the response curves of the driving force percentage and the ball head position voltage corresponding to the opening and closing processes of the fuel quantity actuator respectively, detect the hysteresis performance of the fuel quantity actuator, and then determine whether the control linearity of the fuel quantity actuator is qualified.

2. The method for detecting the hysteresis of an oil quantity actuator according to claim 1, wherein: In the said Step C, specifically perform the following steps to detect the hysteresis performance of the fuel quantity actuator and determine whether the control linearity of the fuel quantity actuator is qualified: Step C1: Based on the response curves of the driving force percentage and the ball head position voltage corresponding to the opening and closing processes of the fuel quantity actuator respectively, obtain the preset characteristic values in the curves; The said preset characteristic values include: the position voltage when reaching the maximum opening in the opening process, the position voltage when reaching the minimum opening in the closing process, the difference between the driving force percentage at the position of reaching the maximum opening in the opening process and the driving force percentage corresponding to the first cycle in the closing process, and the driving force percentage at the position of reaching the maximum opening in the opening process; Step C2: Based on the curves and the preset characteristic values in the curves, combined with the preset thresholds corresponding to the preset characteristic values respectively, realize the detection of the hysteresis performance of the fuel quantity actuator and determine whether the control linearity of the fuel quantity actuator is qualified.

3. The method for detecting the hysteresis of an oil quantity actuator according to claim 2, characterized in that: In the said Step C2, based on the curves, the preset characteristic values in the curves, and the preset thresholds corresponding to the preset characteristic values respectively, the detection of the hysteresis performance of the fuel quantity actuator is as follows. If the following conditions are met simultaneously, the control linearity of the fuel quantity actuator is qualified; otherwise, the control linearity of the fuel quantity actuator is unqualified, that is, the fuel quantity actuator is unqualified: a. Multiply the position voltage sequence V(i) where the position voltage is less than the preset voltage in the response curves corresponding to the opening and closing processes by -1 respectively to obtain the position voltage sequence V'(i), and convolve the position voltage sequence V'(i) with the template The result of the convolution operation is greater than the first preset threshold; b. The position voltage when reaching the maximum opening in the opening process belongs to the first preset threshold interval; c. The position voltage when reaching the minimum opening in the closing process belongs to the second preset threshold interval; d. The difference between the driving force percentage at the position of reaching the maximum opening in the opening process and the driving force percentage corresponding to the first cycle in the closing process is less than the first preset percentage threshold; e. The driving force percentage at the position of reaching the maximum opening in the opening process is less than the second preset percentage threshold.

4. An oil quantity actuator hysteresis detection system, applied to the oil quantity actuator hysteresis detection method described in claim 1, characterized in that: It includes a host computer, an electronic control unit, and at least one fuel quantity actuator. For each fuel quantity actuator respectively: the host computer outputs a preset driving cycle, a driving force step length corresponding to the fuel quantity actuator, and a preset opening degree step length control signal to the electronic control unit. The electronic control unit outputs a driving voltage based on the preset driving cycle, the driving force step length corresponding to the fuel quantity actuator, and the preset opening degree step length control signal to control the opening and closing process of the fuel quantity actuator. And the electronic control unit transmits the position voltage corresponding to the ball head position of the fuel quantity actuator to the host computer in real time. The host computer constructs response curves of the driving force percentage corresponding to the fuel quantity actuator during the opening and closing processes and the ball head position voltage based on the opening degree position voltage of the fuel quantity actuator, and detects the hysteresis performance of the fuel quantity actuator to judge whether the control linearity of the fuel quantity actuator is qualified.

5. The oil quantity actuator hysteresis detection system according to claim 4, wherein: The electronic control unit includes an MCU control module and a low-side drive module. The MCU control module converts the preset driving cycle, the driving force step length corresponding to the fuel quantity actuator, and the preset opening degree step length control signal into a PWM driving signal and inputs it to the low-side drive module. The low-side drive module outputs a driving voltage based on the PWM driving signal to control the opening and closing process of the fuel quantity actuator. And the MCU control module transmits the position voltage corresponding to the ball head position of the fuel quantity actuator to the host computer in real time.

6. The oil quantity actuator hysteresis detection system according to claim 5, wherein: The low-side drive module includes resistors R1 - R12, capacitors C1 - C7, diodes D1 - D2, NOR logic gate U1, NOR logic gate U2, amplifier U3, amplifier U4, MOS transistor Q1, and a storage battery. The PWM drive signal output by the MCU control module is connected to the first input terminal of NOR logic gate U1. The second input terminal of NOR logic gate U1 is grounded. The output terminal of NOR logic gate U1 is connected to the first input terminal of NOR logic gate U2. The second input terminal of NOR logic gate U2 is grounded. The output terminal of NOR logic gate U2 is connected to the gate of MOS transistor Q1 via resistor R1. The source of MOS transistor Q1 is respectively connected to one end of resistor R2 and resistor R3. The other end of resistor R3 is respectively connected to one end of capacitor C4, one end of resistor R5, and the non-inverting input terminal of amplifier U4. The other end of resistor R2 is connected to the inverting input terminal of amplifier U4 via resistor R4. And a parallel combination of resistor R6 and capacitor C5 is connected between the inverting input terminal and the output terminal of amplifier U4. The output terminal of the amplifier is also respectively connected to one end of resistor R7, capacitor C7, and resistor R11. The other ends of resistor R2, capacitor C4, resistor R5, resistor R7, and capacitor C7 are grounded. The other end of resistor R11 is respectively connected to one end of resistor R9 and the non-inverting input terminal of amplifier U3. The inverting input terminal of amplifier U3 is grounded via resistor R12. And a resistor R10 is connected between the inverting input terminal and the output terminal of amplifier U3. The output terminal of amplifier U3 is also respectively connected to the positive electrode of diode D2, one end of capacitor C6, and the low-side diagnostic protection signal via resistor R8. The negative electrode of diode D2 is connected to VCC. The other ends of capacitor C6 and resistor R9 are grounded. The drain of MOS transistor Q1 serves as the output terminal of the low-side drive module to output a drive voltage to control the opening and closing process of the fuel quantity actuator. And the drain of MOS transistor Q1 is respectively connected to the positive electrode of diode D1, one end of capacitor C3, and the positive electrode of the storage battery. The negative electrode of diode D1 is respectively connected to one end of capacitor C1, capacitor C2, and the positive electrode of the storage battery. The other ends of capacitor C1, capacitor C2, and capacitor C3 are grounded.

7. The oil quantity actuator hysteresis detection system according to claim 4, characterized in that: The host computer combines a single-chip microcomputer with a PL2303 interface converter to convert the USB interface into a UART interface and connect it to the MCU control module.

8. The oil quantity actuator hysteresis detection system according to claim 4, characterized in that: It also includes a preset database for collecting and storing data.

9. The oil quantity actuator hysteresis detection system according to claim 8, characterized in that: The preset database adopts a MYSQL database.

10. An oil quantity actuator hysteresis detection terminal, characterized in that: It includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions. The processor executes the computer instructions to execute the method for detecting hysteresis of a fuel quantity actuator according to any one of claims 1 - 3.

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