An OCV valve measurement and control device, method and system

Abstract

The present invention discloses an OCV valve measurement and control device, method and system. The device includes: a main control module, a measurement and acquisition module, an operation execution module, and a power conversion module for providing working voltages of different specifications; wherein: the host computer sends a measurement and control instruction to the main control module; the main control module sets the engine working condition and drives and controls the movement of the OCV valve through the operation execution module according to the measurement and control instruction; the measurement and acquisition module collects the motion parameters of the OCV valve; the host computer or the main control module generates a regulating control signal based on the collected motion parameters and the target motion parameters in the measurement and control instruction to regulate and control the movement of the OCV valve; the measurement and acquisition module collects the performance parameters of the OCV valve and sends the performance parameters to the main control module to determine whether the performance of the OCV valve is qualified. The measurement and control device has the characteristics of improving system stability and detecting the accuracy of valve body performance, reducing the size of the device, reducing costs, and being able to be quickly put on the market in batches.

Description

Technical Field

[0001] The present invention relates to the field of automobile detection, and in particular to an OCV valve detection and control device, method and system. Background Art

[0002] Generally, in automation engineering, variable valve timing (VVT) control technology describes the technology of adjusting the timing for opening and closing the oil control valve based on the rotation of the internal combustion engine. It changes the fixed state of the valve timing in the traditional engine, and adjusts the opening and closing timing of the oil control valve to match the rotation of the engine. Therefore, high fuel efficiency and high output can be obtained at both high and low speeds. The CVCT mechanism is one of the many VVT implementation mechanisms. The CVCT mechanism is a mechanical, electrical, and hydraulic integrated system with oil control valve (OCV), phase shifter, and camshaft as the main components, which can continuously adjust the valve timing of the engine. After the CVCT mechanism is developed, without the corresponding test equipment and testing means, it is impossible to deeply explore the working mechanism of the system, verify and improve the working process of the system, and effectively carry out a new round of design and development. Research and development of OCV valve measurement and control system devices can realize the control of engine speed and phase, as well as the monitoring of pressure, current, temperature and other signals, and understand the actual working performance of the phase adjustment mechanism based on the test results, providing a reliable basis for further research and development, and preparing for future product development and application. Then the existing technologies in domestic car manufacturers and related supply chains have many problems, such as unclear understanding of system principles, which leads to unsatisfactory stability performance of the developed equipment, slow response speed, large control unit size, etc.

[0003] Currently, there is no OCV valve measurement and control device on the market to realize the detection and control of various indicators of the CVCT mechanism. Summary of the invention

[0004] The present invention provides an OCV valve measurement and control device, method and system for quickly and accurately detecting the performance of the OCV valve. Specifically, the technical solution of the present invention is as follows:

[0005] On the one hand, the present invention provides an OCV valve measurement and control device, including: a main control module, a measurement and acquisition module, a power conversion module, and an operation execution module; wherein: the power conversion module is used to convert the connected power supply voltage into working voltages of different specifications to provide them to each module; the upper computer sends measurement and control instructions to the main control module; the main control module sets the engine operating conditions and drives and controls the movement of the OCV valve through the operation execution module according to the measurement and control instructions; the measurement and acquisition module collects the motion parameters of the OCV valve; the upper computer or the main control module generates an adjustment control signal based on the collected motion parameters of the OCV valve and the target motion parameters in the measurement and control instructions to adjust and control the movement of the OCV valve; the measurement and acquisition module collects the performance parameters of the OCV valve, and sends the performance parameters of the OCV valve to the main control module to determine whether the performance of the OCV valve is qualified.

[0006] Preferably, the measurement and acquisition module includes: a speed acquisition submodule, used to acquire the speed of the engine that drives the OCV valve to move; a phase acquisition submodule, used to acquire the camshaft phase of the engine; a temperature acquisition submodule, used to acquire the temperature of the OCV valve when it moves; an oil pressure acquisition submodule, used to acquire the oil pressure in the OCV valve; and a current acquisition submodule, used to acquire the current when the OCV valve moves.

[0007] Preferably, the motion parameters are the phase parameters of the camshaft of the OCV valve and the speed parameters of the engine that drives the OCV valve to move; the main control module includes: an information receiving and sending submodule, which is used to exchange information with each submodule; an information processing submodule, which is used to obtain a phase adjustment control signal for adjusting the phase of the camshaft to the target phase based on the phase parameter information collected by the measurement and acquisition submodule and the target phase information of the camshaft of the OCV valve in the measurement and control instruction; the operation execution module, after receiving the phase adjustment control signal, adjusts and controls the camshaft phase of the engine; a performance detection submodule, which is used to evaluate whether the performance of the OCV valve is qualified according to the performance parameters of the OCV valve collected by the measurement and acquisition submodule under different working conditions.

[0008] Preferably, the phase acquisition submodule comprises: a camshaft sensor unit, used for acquiring the camshaft phase of the engine through a camshaft sensor; and / or an encoder unit, used for automatically acquiring the camshaft phase of the engine through an encoder.

[0009] Preferably, an optocoupler isolation module is provided between the output end of the measurement acquisition module and the input end of the main control module; and / or an optocoupler isolation module is provided between the output end of the main control module and the input end of the drive execution module.

[0010] Preferably, the information processing submodule specifically includes: a difference calculation unit, used to calculate the difference between the phase parameter collected by the measurement and acquisition module and the target phase; a PID parameter setting unit, used to generate the current PID control parameter according to the difference between the phase parameter and the target phase, combined with the currently collected speed parameter, according to preset rules; a PID control unit, used to generate a corresponding control signal according to the input PID control parameter, so as to control and adjust the OCV valve to the target phase.

[0011] Preferably, the camshaft sensor used is a magnetoelectric camshaft position sensor; the signal output end of the magnetoelectric camshaft position sensor is also provided with a signal setting circuit for performing signal setting processing on the voltage signal output by the magnetoelectric camshaft position sensor to obtain a square wave signal with the same frequency as the voltage signal output by the magnetoelectric position sensor.

[0012] In a second aspect, the present invention further provides an OCV valve measurement and control method, which is applied to the OCV valve measurement and control device described in any one of the present invention, and the method includes: receiving a measurement and control instruction issued by a host computer; setting the engine operating condition according to the measurement and control instruction, and driving and controlling the movement of the OCV valve; collecting the motion parameters of the OCV valve; generating an adjustment control signal based on the collected motion parameters of the OCV valve and the target motion parameters in the measurement and control instruction to adjust and control the movement of the OCV valve; collecting the performance parameters of the OCV valve; and judging whether the performance of the OCV valve is qualified according to the performance parameters of the OCV valve and the performance parameter standard of the OCV valve.

[0013] In a third aspect, the present invention further provides an OCV valve measurement and control system, comprising the OCV valve measurement and control device according to any one of the present invention, a host computer, and a CVCT mechanism; the OCV valve measurement and control device is communicatively connected to the host computer, and the OCV valve measurement and control device is electrically connected to the CVCT mechanism; wherein: the host computer issues a measurement and control instruction to the OCV valve measurement and control device; the OCV valve measurement and control device sets the working condition of the engine in the CVCT mechanism through a motor frequency converter according to the measurement and control instruction, so that the engine runs, and then drives the OCV valve to be measured in the CVCT mechanism. V valve movement; the OCV valve measurement and control device collects the current phase information of the camshaft of the engine in the CVCT mechanism and the speed information of the engine; the OCV valve measurement and control device generates a control signal for controlling the movement of the OCV valve to be tested based on the collected phase information and speed information and in combination with the measurement and control instructions, controls the movement of the OCV valve to be tested, and adjusts the camshaft phase of the engine in real time to adjust the valve timing of the engine; the OCV valve measurement and control device collects the performance parameters of the OCV valve to be tested to determine whether the performance of the OCV valve to be tested is qualified.

[0014] Preferably, the power lines used in the OCV valve measurement and control system are all RVVP power lines with shielding layers.

[0015] The present invention includes at least one of the following technical effects:

[0016] (1) In this application, after the main control module receives the measurement and control instruction, it will set the working conditions, drive the OCV valve to move through the drive execution module, and then use the measurement and acquisition module to collect the movement parameters of the OCV valve, and then control and adjust the OCV, and collect some performance parameters of the OCV valve through the measurement and acquisition module, so that the main control module can evaluate the performance of the OCV valve. This application takes the main control module as the core, and the measurement and acquisition module assists in collecting various parameter information of the OCV valve. The main control module generally uses a high-performance MCU chip, which has the characteristics of improving system stability, improving response speed, improving the accuracy of valve body performance detection, reducing device size and reducing costs, and being able to be quickly put on the market in batches.

[0017] (2) In the present application, the main control module obtains the difference between the current phase and the target phase based on the speed and phase of the OCV valve collected by the measurement and acquisition module, combined with the target phase under the current working conditions, thereby obtaining the corresponding adjustment control signal. Through this PID control, closed-loop control can be achieved. By continuously adjusting the movement of the OCV valve, the phase of the camshaft reaches or approaches the target phase, thereby achieving the best valve timing. The various performance parameters of the OCV valve collected during this adjustment process can also more accurately reflect the various performances of the OCV valve, making the final detection result more accurate.

[0018] (3) In the present application, there are two methods for measuring and collecting the camshaft phase. One is the traditional method of measuring and collecting through a camshaft sensor, and the other is to obtain and collect through an encoder. The use of an encoder can greatly reduce the complexity of the circuit, making the entire measurement and control device simpler and more intelligent.

[0019] (4) In the present application, if the operating voltages required by the measurement and acquisition module are different from those required by the main control module, an optocoupler isolation module may be provided between the measurement and acquisition module and the main control module to reduce signal interference and ensure the precision and accuracy of the acquisition signal output by the measurement and acquisition module to the main control module. Similarly, an optocoupler isolation module may also be provided between the main control module and the driving main control module. In addition, all power lines in the entire measurement and control device or measurement and control system may use RVVP power lines with a shielding layer, which can effectively prevent strong interference generated by external electrical interference from causing fluctuations in system stability, especially affecting the sampling accuracy of the sensor, thereby further improving the stability of the system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural block diagram of an embodiment of an OCV valve measurement and control device of the present invention;

[0022] Figure 2 It is a structural block diagram of another embodiment of an OCV valve measurement and control device of the present invention;

[0023] Figure 3 A circuit diagram of a signal conditioning circuit provided at the output end of a magnetoelectric camshaft position sensor;

[0024] Figure 4 A circuit diagram for performing signal amplification and current sampling on the regulation control signal output by the MCU module;

[0025] Figure 5 A structural block diagram of another embodiment of an OCV valve measurement and control device of the present invention;

[0026] Figure 6 A flow chart of an embodiment of an OCV valve measurement and control method of the present invention;

[0027] Figure 7 The structure diagram of an embodiment of an OCV valve measurement and control system of the present invention. DETAILED DESCRIPTION

[0028] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0029] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0030] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0031] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0032] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0034] Regarding the OCV valve and the corresponding CVCT mechanism, their specific structures and working principles are all existing technologies and will not be described here in detail to reduce space.

[0035] like Figure 1 As shown, the present invention provides an embodiment of an OCV valve measurement and control device, comprising: a main control module 100, a measurement and acquisition module 200, a power conversion module 300, and an operation execution module 400; wherein:

[0036] The power conversion module 300 is used to convert the input power voltage into working voltages of different specifications to provide to each module;

[0037] Specifically, since each module may require a different power supply voltage, a power conversion module that can provide power supply voltages of various specifications is required; preferably, a guide rail integrated power supply module is used, which eliminates the need for complex power conversion circuits, reduces the size of the circuit board, and all cables inside the device are clearly laid out, with standardized wiring and standard specifications. This not only takes into account the cost savings, but also reserves enough space for future maintenance, so that the device can shorten the production cycle and quickly be commercialized and put into market application. For example, if three power supply voltages of 24V, 12V and 5V are required, the Mean Well switching power supply can be used: HDR-60-5 provides 5V voltage, EDR-120-12 provides 12V voltage, and EDR-120-24 provides 24V voltage. These switching power supplies are small in size, high in precision and small in ripple, and are guide rail mounted, making them easy to install. Preferably, the power supply voltages of different specifications contained in the power conversion module are independent and isolated from each other. A switch can be set at the front end of the power supply to control the on and off of the overall power supply of the circuit, and a 220V indicator light is provided as a display.

[0038] The main control module 100 is used to receive the measurement and control instructions issued by the host computer, and set the engine working condition through the operation execution module according to the measurement and control instructions, and drive and control the movement of the OCV valve;

[0039] Specifically, the main control module 100 is the core of the measurement and control device of this embodiment, which is used to control and schedule each module to work. In the traditional solution, all control modules are expensive NI boards, Advantech boards or PLC modules. This solution can use a high-performance MCU as the main control chip, and integrate various circuit modules to complete the various functions involved, which greatly reduces the cost and is more suitable for large-scale production of products. Generally, the main control module 100 is provided with a variety of communication interfaces, such as a 485 serial communication interface, which is used to connect the frequency conversion controller of the OCV valve (the frequency conversion controller is used to control the speed of the engine); a CAN communication interface, which can be used to connect external devices; a network interface, which is used to maintain a communication connection with a host computer or an industrial computer, etc.

[0040] Preferably, the main control chip used in the main control module 100 of the present application is the domestic MM32F103XX series MCU as the main control chip. The MCU is a new generation of 32-bit microcontroller based on the ARMCortex-M3 core, with an operating voltage (2V-5.5V), industrial-grade temperature (-40°C to 105°C), a built-in 48MHz crystal oscillator with an accuracy of 1% at room temperature and pressure, a built-in high-speed configurable memory, and strong anti-interference (ESD 8KV, EFT4KV). It has a wealth of peripheral interfaces, including SPI, UART, CAN2.0, IIC, 12 ADC, etc., the ultra-high working frequency and large-capacity built-in Flash module and SRAM module meet the use conditions of this system. Combined with the use of the embedded real-time operating system RT-Threadv3.0.4, the embedded firmware of the device is more modular, the module functions are more refined, and the portability, reusability and readability are greatly enhanced; the W5500 high-performance Ethernet interface chip and the built-in LWIP protocol stack component are used in the part of exchanging TCP data with the outside, which greatly improves the networking performance and greatly simplifies the communication operation. The RT-Threadv3.0.4 embedded real-time operating system mainly schedules six tasks, namely TCPServer listening task, AD sampling task, PID calculation task, relative phase sampling and calculation task, PWM control output task, motor start and stop and speed control task, etc. Multiple real-time tasks can respond in real time and do not affect each other, and a software watchdog mechanism is added to ensure that the program can always run stably. Considering the possibility that the subsequent firmware will need to be upgraded, the IAP application upgrade interface is reserved in the existing version of the firmware. The use of a standard 10M / 100M Ethernet interface at the data transmission layer, coupled with an optimized data structure and a non-blocking TCP communication architecture, enables rapid information transmission between the entire device and the actuator, improving the overall response speed and execution efficiency of the system.

[0041] The measurement and acquisition module 200 acquires the motion parameters of the OCV valve; specifically, the motion parameters of the OCV valve mainly refer to the speed information of the engine driving the OCV valve to move and the camshaft phase information thereof.

[0042] The host computer or main control module 100 generates a regulating control signal according to the collected motion parameters of the OCV valve and the target motion parameters in the measurement and control instructions, so as to regulate and control the motion of the OCV valve;

[0043] The measurement and acquisition module 200 acquires the performance parameters of the OCV valve, and sends the performance parameters of the OCV valve to the main control module 100 to determine whether the performance of the OCV valve is qualified.

[0044] The working principle of the OCV valve measurement and control device of this embodiment is: the engine speed information and camshaft phase information signal collected by the measurement and acquisition module 200 are sent to the main control module 100, and after analysis and calculation, instructions are issued, and the PWM signal (adjustment control signal) is output through the driving execution module 400 to control the OCV valve, change its high-pressure oil channel, and then drive the phase shifter of the test bench to work, so that it can adjust the intake camshaft phase and exhaust camshaft phase in real time according to different engine speeds (simulating different working conditions) (the phases here are relative, and the initial values ​​are set by the engine cylinder head manufacturer, generally within a range of 40°), so that the valve timing reaches the best. In the process of phase adjustment, the control performance of the OCV valve is detected by monitoring information such as oil pressure, OCV current, and phase change.

[0045] In the traditional solution, all the main control modules and acquisition modules are expensive NI boards, Advantech boards or PLC modules. This embodiment uses a high-performance MCU as the main control chip (main control module), and integrates various circuit modules to complete the various functions involved, which greatly reduces the cost and is more suitable for large-scale production of products.

[0046] The parameters that need to be monitored during the operation of the OCV valve measurement and control device are mainly as follows:

[0047] Pressure: main oil gallery oil pressure, OCV inlet oil pressure, OCV outlet PA, PB oil pressure; Temperature: main oil gallery oil temperature, OCV inlet oil temperature;

[0048] Current: intake side OCV current, exhaust side OCV current;

[0049] Phase: intake camshaft phase, exhaust camshaft phase;

[0050] RPM: Engine speed.

[0051] Therefore, correspondingly, Figure 2 As shown, the measurement acquisition module 200 in another embodiment of the measurement and control device of the present invention includes:

[0052] The speed acquisition submodule 210 is used to acquire the speed of the engine that drives the movement of the OCV valve; specifically, the speed measurement can be achieved by using an encoder. For example, the crankshaft encoder used to measure the speed can be a crankshaft encoder of model E6C3-CWZ5GH. The speed measurement methods include frequency measurement method and cycle measurement method (existing technology, which will not be expanded this time). For example, when the cycle measurement method is used to measure the engine speed, the encoder Z phase signal can be used as the periodic signal. The period between each two adjacent Z phase pulses is a rotation period. The system measures the number of timing signals between two adjacent Z phase pulses to determine the speed. The system time base frequency is 1MHz.

[0053] The phase acquisition submodule 220 is used to acquire the camshaft phase of the engine; specifically, the intake camshaft phase and the exhaust camshaft phase; regarding phase acquisition, two different methods can be used to obtain it. Specifically, the phase acquisition submodule includes: a camshaft sensing unit and an encoder unit. The camshaft sensing unit acquires the camshaft phase of the engine through a camshaft sensor, wherein the camshaft sensor can, for example, adopt a magnetoelectric camshaft sensor, which is a more traditional phase acquisition method. Another method is that the encoder unit automatically acquires the camshaft phase of the engine through an encoder; the encoder method of acquiring signals has the characteristics of being more convenient, stable and efficient, simple in circuit, easy to implement in software algorithm, and cost-saving. Since there is no need to measure the forward and reverse parameters of the motor, the real-time relative phase can be accurately acquired by using the Z-axis signal and the timer function of the MCU.

[0054] In addition, if the camshaft sensor used is a magnetoelectric camshaft position sensor, a signal setting circuit is also provided at the signal output end of the magnetoelectric camshaft position sensor to perform signal setting processing on the voltage signal output by the magnetoelectric camshaft position sensor to obtain a square wave signal with the same frequency as the voltage signal output by the magnetoelectric position sensor. Specifically, one implementation of the signal setting circuit is as follows: Figure 3As shown, the output voltage signals Z1+ and Z1- of the magnetoelectric camshaft position sensor are input into the signal setting circuit for setting. Specifically, the input voltage signal Z1+ is electrically connected to the negative input terminal of the voltage comparator U1A after passing through resistors R1_12 and R1_15 in sequence, and the input voltage signal Z1- is electrically connected to the positive input terminal of the voltage comparator U1A after passing through resistors R1_10, R1_14, and R1_16 in sequence; and the voltage signal Z1+ is connected to the ground after passing through a capacitor C1_10, and the voltage signal Z1- is connected to the ground after passing through a capacitor C1_11. The common terminal of the resistor R1_10 and the resistor R1_14 is electrically connected to the input terminal of a voltage regulator tube D1_10, and the common terminal of the resistor R1_12 and the resistor R1_15 is electrically connected to the output terminal of the voltage regulator tube D1_10; and a capacitor C1_13 is arranged between the common terminal of the resistors R1_12 and R1_15 and the common terminal of the resistors R1_14 and R1_16; the common terminal of the resistors R1_10 and R1_14 is electrically connected to the common terminal of the resistor R1_12 and the capacitor C1_10 through a parallel RC circuit (the resistor R1_11 is connected in parallel with the capacitor C1_12); the input terminal of the voltage regulator tube D1_10 is grounded after passing through a capacitor C1_15, and the two ends of the capacitor C1_15 are electrically connected through a diode D1_11, and the diode D1_11 The input end of the voltage comparator U1A is electrically connected to the +5V power supply through a resistor R1_13, and the output end of the diode D1_11 is grounded; the output end of the voltage comparator U1A is connected to the +5V power supply through a pull-up resistor R1_19; the output end of the voltage comparator U1A is electrically connected to the common end of the resistors R1_14 and R1_16 through an RC circuit, and the RC circuit includes a series RC sub-circuit composed of a resistor R1_18 and a capacitor C1_14 connected in series, and a resistor R1_17 is connected in parallel at both ends of the series RC sub-circuit; the voltage signal NE1_O outputted from the output end of the voltage comparator U1A is the square wave signal outputted after adjustment.

[0055] The voltage comparator U1A used in the above setting circuit can be a LM2901D voltage comparator. Of course, other voltage comparators can also be used, such as the LM339 series low-power voltage comparator.

[0056] For the phase acquisition submodule 220, two sampling methods, namely, an encoder method and a magnetoelectric camshaft sensor method, can be adopted, which has stronger scalability.

[0057] The temperature acquisition submodule 230 is used to collect the temperature of the OCV valve when it moves; specifically, it mainly collects the main oil channel oil temperature and the OCV inlet oil temperature; for example, the temperature transmitter model ADAM-4015 is selected, used in conjunction with a Pt-100 thermal resistor, and the output interface is a standard ModbusRTU protocol for communication with the MCU.

[0058] The oil pressure collection submodule 240 is used to collect the oil pressure in the OCV valve; specifically, the main oil gallery oil pressure, the OCV inlet oil pressure, and the OCV outlets PA and PB oil pressures;

[0059] The current collection submodule 250 is used to collect the current when the OCV valve moves; specifically, the intake side OCV current and the exhaust side OCV current; specifically, Figure 4 As shown, after the operation execution module receives the adjustment control signal output by the main control module, the phase adjustment control signal (PWM signal) output by the MCU module is amplified through the circuit. In the circuit, P2IN is the adjustment control signal PWM input by the MCU module, and the amplified adjustment control signal output by P2OUT is then transmitted to the OCV valve to be tested; and in the circuit, the resistor R2_7 is the sampling resistor, and the output of PV2 is the sampling current. The current acquisition submodule only needs to collect the current at PV2.

[0060] The corresponding signals collected by the above-mentioned acquisition sub-modules are all current signals. The current signals are converted into voltage signals through series resistors, the pressure signals are converted into voltage signals through pressure sensors, and the temperature signals are converted into voltage signals through thermocouple sensors. All voltage signals are input into the 12-bit AD sampling channel of the main control module, and the actual signal values ​​are obtained through calculation of the AD sampling task.

[0061] The control signals output by the OCV valve measurement and control device during operation mainly include PWM signals, inverter control signals and TCP structure data signals. Among them, the PWM signal is used to control the opening of the OCV to achieve the adjustment of the camshaft phase under different working conditions. The inverter control signal is used to adjust the engine speed to achieve different working conditions. The TCP structure data signal is used for monitoring, display and calculation of control instruction parameters by the host computer.

[0062] A server is opened in the TCPServer listening task, and the host software client actively initiates a TCP link to it. After the connection is established, the client sends a request packet to request various monitoring data. The server receives data through a ring buffer + interrupt, and then the hardware CRC (cyclic redundancy check) calculation unit parses the data packet and makes different responses according to the proposed protocol. In order to ensure that the host software can refresh the data in time, the heartbeat duration between the client and the server is 500ms. Because there is only one TCP link, the CPU resource overhead is not very high, and communication can be maintained all the time.

[0063] The AD sampling task uses up to 7 external channels available to the ADC, operates it in continuous scanning mode, cyclically and automatically converts the collected values ​​on the 7 channels, and then encapsulates the results into the member variables corresponding to the TCP data structure. Among the AD analog parameters monitored by this device, only the torque signal is a high-speed signal and needs to be displayed in real time in the monitoring curve chart, while other signal data can be refreshed every 3-5 seconds.

[0064] The motor start and stop and speed control tasks are realized by using the 485 serial port hardware peripheral. Since the MCU itself has a UART peripheral interface, the circuit uses the MAX485 chip to convert its TTL level signal into a 485 signal, and the interface terminal is connected to a 120R matching resistor to enhance the communication anti-interference. It is connected to the inverter through a shielded twisted pair cable, and remote data interaction with the inverter is carried out through the industrial MODBUS protocol, which can stably and reliably control the main drive motor on the console.

[0065] The relative phase sampling and calculation task mainly utilizes the input capture mode and encoder interface mode of the advanced timer T1. When the timer is configured to the corresponding mode, the signal output by the crankshaft encoder will trigger the capture register count value on the corresponding channel to increase, and then the multi-cycle frequency measurement algorithm is used to calculate the motor speed under the current working conditions. The multi-cycle frequency measurement method has the advantages of the frequency measurement method and the cycle measurement method. It measures the time of several cycles of the measured signal and then converts it to the frequency of the measured signal. It can take into account both low-frequency and high-frequency signals, improves the measurement accuracy, and is very suitable for scenarios where the motor speed requirement spans 800RPM-6000RPM. After obtaining the speed, record the characteristic points (crankshaft phase) of the crankshaft encoder signal, and use the same method to measure the characteristic points of the camshaft encoder signal. Finally, the relative phase of the camshaft can be calculated from the two.

[0066] The PWM control output task mainly utilizes the PWM output mode of the advanced timer T1, and can output PWM pulse waves with different duty cycles on different channels. The pulse wave is input into the output execution unit 10, and the transistors and MOS tubes inside the circuit amplify the signal, thereby enhancing the driving capability so that the OCV valve can move normally and quickly in the entire chamber. This task is directly related to the performance of the device and can also be used to manually detect the quality of the OCV valve body.

[0067] In the above embodiment, the motion parameters are the phase parameters of the camshaft of the OCV valve and the speed parameters of the engine driving the OCV valve to move; the main control module 100 specifically includes:

[0068] The information transceiver submodule 110 is used to exchange information with each submodule;

[0069] The information processing submodule 120 is used to obtain a phase adjustment control signal for adjusting the phase of the camshaft to the target phase based on the phase parameter information collected by the measurement and collection submodule and the target phase information of the camshaft of the OCV valve in the measurement and control instruction;

[0070] The operation execution module 400 adjusts and controls the camshaft phase of the engine after receiving the phase adjustment control signal;

[0071] The performance detection submodule 130 is used to measure the performance parameters of the OCV valve collected by the collection submodule under different working conditions to evaluate whether the performance of the OCV valve is qualified.

[0072] Preferably, another embodiment of the measurement and control device of the present invention is as follows Figure 5 As shown, based on the above embodiment, the information processing submodule 120 specifically includes:

[0073] The difference calculation unit 121 is used to calculate the difference between the phase parameter collected by the measurement and acquisition module and the target phase;

[0074] The PID parameter setting unit 122 is used to generate the current PID control parameter according to the difference between the phase parameter and the target phase and the currently acquired speed parameter according to the preset rules;

[0075] The PID control unit 123 is used to generate a corresponding control signal according to the input PID control parameters, so as to control and adjust the OCV valve to a target phase.

[0076] In this embodiment, the camshaft phase modulation control adopts PID algorithm control. Specifically, it includes a closed-loop phase control system. The phase acquisition module involved is designed by the aforementioned phase measurement method. The measured phase value and the set target phase value are input into the main control module. The main control module adopts the classic position PID control algorithm to output the PWM signal for adjustment control to adjust the phase of the camshaft to be close to the target phase. This device adopts the position PID control algorithm, mainly based on two considerations: one is that the device has high requirements for phase control accuracy; the other is that the maximum range of the phase shifter is 40 degrees, and the large change of the phase has no destructive effect on the phase shifter and the engine. The PID parameter self-tuning module generates the current PID control parameters according to certain rules based on the current deviation and the current working conditions of the system, and then inputs the control parameters into the PID controller to control the controlled object. This control method can make the control system relatively optimal at each working point, thereby improving the adjustment performance of the system and ensuring the control quality. The main control module can achieve fast and high-precision control of different phases. In the phase adjustment process within the range of 15 degrees, the maximum adjustment time is less than 0.4 seconds, the maximum overshoot is less than 1.5 degrees, and the control accuracy reaches ±0.3 degrees, which meets the application requirements. If the control frequency is too low, it will definitely not achieve a good control effect. If the control frequency is too high, it will consume too many system resources and will not improve the control quality. Here, the PID calculation task output cycle is 5ms, which fully meets the application requirements.

[0077] Preferably, an optical coupler isolation module 500 is provided between the output end of the measurement acquisition module 200 and the input end of the main control module 100; specifically, due to the problem of different input power supply voltages in the acquisition and control signals, a low-speed optical coupler can be used to isolate the signal, reduce the noise of the signal and make the sampling more accurate. For example, a low-speed optical coupler TLP521-4 is used to isolate the signal.

[0078] Similarly, an optical coupling isolation module 500 may also be provided between the output end of the main control module 100 and the input end of the driving execution module 400 .

[0079] Preferably, in any of the above-mentioned embodiments of the measurement and control device, all power lines and signal lines can use RVVP wires with a shielding layer. By setting up optocoupler isolation circuits in multiple circuits and using RVVP power lines / signal lines with a shielding layer, it is possible to effectively prevent strong interference generated by external electrical devices from causing fluctuations in system stability, especially affecting the sampling accuracy of the sensor, thereby further improving the stability of the system operation.

[0080] Based on the same technical concept, the present invention also provides an OCV valve measurement and control method, which can be applied to any OCV valve measurement and control device of the present invention. Specifically, a flow chart of an embodiment of an OCV valve measurement and control method is as follows: Figure 6 As shown, including:

[0081] S101, receiving the measurement and control instructions issued by the host computer;

[0082] S102, setting the engine operating condition according to the measurement and control instruction, and driving and controlling the movement of the OCV valve;

[0083] S103, collecting motion parameters of the OCV valve;

[0084] S104, generating a regulating control signal according to the collected motion parameters of the OCV valve and the target motion parameters in the measurement and control instruction, so as to regulate and control the motion of the OCV valve;

[0085] S105, collecting performance parameters of the OCV valve;

[0086] S106, judging whether the performance of the OCV valve is qualified according to the performance parameters of the OCV valve and the performance parameter standard of the OCV valve.

[0087] In this embodiment, the host computer and the OCV valve measurement and control device of the present invention are connected via Ethernet communication. The inspector issues measurement and control instructions on the host computer, and then the host computer transmits them to the main control chip (main control module) of the OCV valve measurement and control device. Then the main control chip sets the engine working condition (speed), and then drives and controls the movement of the OCV valve through the operation execution module. Then the measurement and acquisition module of the OCV valve measurement and control device collects the engine speed and camshaft phase information that drives the OCV valve to move, and then obtains the adjustment control signal that makes the camshaft move from the current phase to the target phase according to the target phase in the measurement and control instruction, and then adjusts and controls the movement of the OCV valve. In the adjustment control, various performance parameters of the OCV valve will also be collected, such as the current temperature, current, engine speed, camshaft phase, oil pressure, etc., and combined with the performance parameter standard of the OCV valve, it can be judged whether the performance of the OCV valve is qualified.

[0088] Finally, the present invention also provides an OCV valve measurement and control system, which can be implemented as follows: Figure 7 As shown, it includes an OCV valve measurement and control device 20, a host computer 10, and a CVCT mechanism 30 according to any one of the present invention; wherein:

[0089] The host computer 10 sends a measurement and control instruction to the OCV valve measurement and control device 20;

[0090] The OCV valve measurement and control device 20 sets the working condition of the engine in the CVCT mechanism 30 through the motor frequency converter according to the measurement and control instruction, so as to make the engine run, thereby driving the OCV valve to be measured in the CVCT mechanism to move;

[0091] The OCV valve measurement and control device 20 collects the current phase information of the engine's camshaft and the engine's speed information in the CVCT mechanism;

[0092] The OCV valve measurement and control device 20 generates a control signal for controlling the movement of the OCV valve to be measured based on the collected phase information and speed information, combined with the measurement and control instructions, controls the movement of the OCV valve to be measured, and adjusts the camshaft phase of the engine in real time to adjust the valve timing of the engine;

[0093] The OCV valve measurement and control device 20 collects performance parameters of the OCV valve to be tested and determines whether the performance of the OCV valve to be tested is qualified.

[0094] In the embodiment of the system, the OCV valve measurement and control device 20 mainly adopts the large capacity and high main frequency MCU of the CortexM3 core of the MM32F103xx series as the main control chip (main control module). Its built-in Flash module and RAM module are matched with its rich peripheral interfaces to fully meet the use conditions of the device. Combined with the use of the domestic embedded real-time operating system RT-Thread, the embedded firmware program of the device is more modular, which greatly reduces the complexity of software development and is easy to maintain and upgrade in the later stage. The embedded software architecture is clear, the code encapsulation is modular, and multiple tasks are uniformly scheduled by the embedded real-time operating system, including TCPServer listening tasks (used for monitoring, display and calculation of control instruction parameters of the host computer), AD sampling tasks, PID calculation tasks (using PID to adjust the control signal); relative phase sampling and calculation tasks, PWM control output tasks, motor start and stop and speed control tasks and other real-time tasks. Each task is assigned a corresponding priority level. High-priority tasks can interrupt low-priority tasks, ensuring the real-time performance and stable performance of the entire workflow. The software code of each task is highly modular and has strong portability.

[0095] Preferably, in any of the above embodiments, the power lines used in the OCV valve measurement and control system or the OCV valve measurement and control device are RVVP power lines with shielding layers. Specifically, the signal and power lines with shielding layers are used to enhance the stability and anti-interference of the entire system. In addition, since the motor will generate strong magnetic field interference when running at high speed, a magnetic ring can be added to the power line of the power distribution cabinet to reduce EMI interference.

[0096] The OCV valve measurement and control method and OCV valve measurement and control system of the present invention correspond to the OCV valve measurement and control device of the present invention. The technical details of the embodiments of the OCV valve measurement and control device of the present invention are also applicable to the OCV valve measurement and control system and method of the present invention, and will not be described again to reduce repetition.

[0097] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0098] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0100] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0101] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An OCV valve measurement and control device, characterized in that: include: Main control module, measurement acquisition module, power conversion module, operation execution module; among which: The power conversion module is used to convert the connected power voltage into working voltages of different specifications to provide to each module; The host computer sends a measurement and control instruction to the main control module; the main control module sets the engine working condition through the operation execution module according to the measurement and control instruction, and drives and controls the movement of the OCV valve; The measurement and acquisition module acquires the motion parameters of the OCV valve, wherein the motion parameters are the phase parameters of the camshaft of the OCV valve and the speed parameters of the engine driving the OCV valve to move; The host computer or main control module generates a regulating control signal according to the collected motion parameters of the OCV valve and the target motion parameters in the measurement and control instruction, so as to regulate and control the motion of the OCV valve; The measurement and acquisition module acquires the performance parameters of the OCV valve, and sends the performance parameters of the OCV valve to the main control module to determine whether the performance of the OCV valve is qualified; The main control module comprises: The information receiving and sending submodule is used to exchange information with each submodule; An information processing submodule, configured to obtain a phase adjustment control signal for adjusting the phase of the camshaft to the target phase based on the phase parameter information collected by the measurement and acquisition module and in combination with the target phase information of the camshaft of the OCV valve in the measurement and control instruction; The operation execution module adjusts and controls the camshaft phase of the engine after receiving the phase adjustment control signal; A performance detection submodule, used to evaluate whether the performance of the OCV valve is qualified according to the performance parameters of the OCV valve collected by the measurement and collection module under different working conditions; The information processing submodule specifically includes: A difference calculation unit, used to calculate the difference between the phase parameter collected by the measurement and acquisition module and the target phase; A PID parameter setting unit, used to generate a current PID control parameter according to a difference between the phase parameter and the target phase and in combination with the currently acquired speed parameter and in accordance with a preset rule; The PID control unit is used to generate a corresponding control signal according to the input PID control parameter, so as to control and adjust the OCV valve to the target phase.

2. An OCV valve measurement and control device according to claim 1, characterized in that: The measurement acquisition module comprises: A speed acquisition submodule, used to acquire the speed of the engine driving the OCV valve to move; A phase acquisition submodule, used for acquiring the camshaft phase of the engine; A temperature collection submodule, used to collect the temperature of the OCV valve when it moves; An oil pressure collection submodule, used for collecting the oil pressure in the OCV valve; The current collection submodule is used to collect the current when the OCV valve moves.

3. An OCV valve measurement and control device according to claim 2, characterized in that: The phase acquisition submodule comprises: A camshaft sensor unit, used for collecting a camshaft phase of the engine through a camshaft sensor; and / or The encoder unit is used to automatically obtain the camshaft phase of the engine by means of an encoder.

4. An OCV valve measurement and control device according to claim 3, characterized in that: An optical coupling isolation module is provided between the output end of the measurement acquisition module and the input end of the main control module; And / or, an optical coupling isolation module is provided between the output end of the main control module and the input end of the driving execution module.

5. An OCV valve measurement and control device according to claim 4, characterized in that: The camshaft sensor used is a magnetoelectric camshaft position sensor; the signal output end of the magnetoelectric camshaft position sensor is also provided with a signal setting circuit for performing signal setting processing on the voltage signal output by the magnetoelectric camshaft position sensor to obtain a square wave signal with the same frequency as the voltage signal output by the magnetoelectric camshaft position sensor.

6. An OCV valve measurement and control method, characterized in that: Applicable to the OCV valve measurement and control device according to any one of claims 1 to 5, the method comprising: Receive measurement and control instructions issued by the host computer; According to the measurement and control instructions, the engine operating conditions are set, and the movement of the OCV valve is driven and controlled; collecting motion parameters of the OCV valve; Generate a regulating control signal according to the collected motion parameters of the OCV valve and the target motion parameters in the measurement and control instruction, so as to regulate and control the motion of the OCV valve; Collecting performance parameters of the OCV valve; According to the performance parameters of the OCV valve and in combination with the performance parameter standard of the OCV valve, it is determined whether the performance of the OCV valve is qualified.

7. An OCV valve measurement and control system, characterized in that: The OCV valve measurement and control device comprises the OCV valve measurement and control device according to any one of claims 1 to 5, comprising a host computer and a CVCT mechanism; the OCV valve measurement and control device is communicatively connected to the host computer, and the OCV valve measurement and control device is electrically connected to the CVCT mechanism; wherein: The host computer issues a measurement and control instruction to the OCV valve measurement and control device; The OCV valve measurement and control device sets the working condition of the engine in the CVCT mechanism through the motor frequency converter according to the measurement and control instruction, so as to make the engine run, thereby driving the OCV valve to be measured in the CVCT mechanism to move; The OCV valve measurement and control device collects the current phase information of the camshaft of the engine in the CVCT mechanism and the speed information of the engine; The OCV valve measurement and control device generates a control signal for controlling the movement of the OCV valve to be measured according to the current phase information of the camshaft and the speed information of the engine in combination with the measurement and control instruction, controls the movement of the OCV valve to be measured, and adjusts the camshaft phase of the engine in real time to adjust the valve timing of the engine; The OCV valve measurement and control device collects performance parameters of the OCV valve to be tested and determines whether the performance of the OCV valve to be tested is qualified.

8. An OCV valve measurement and control system according to claim 7, characterized in that: The power lines used in the OCV valve measurement and control system are all RVVP power lines with shielding layers.

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