Variable valve timing control system and control method, control device and equipment thereof

Abstract

The invention relates to a variable valve timing control system and a control method, device and equipment thereof, and relates to the technical field of engine testing. The system comprises an engine electronic control unit used for receiving a crankshaft position sensor signal of an engine and a camshaft position sensor signal of the engine, determining actual valve timing of a camshaft and generating an engine oil control valve control signal based on the actual valve timing and preset target valve timing; the engine oil control valve control signal is used for controlling an engine oil control valve to adjust actual valve timing to preset target valve timing; and the data conversion module is connected with the engine electronic control unit and is used for receiving the crankshaft position sensor signal, the camshaft position sensor signal, the motor feedback signal of the engine and the engine oil control valve control signal in real time, generating a motor driving signal and transmitting the motor driving signal to the motor. By adopting the system, the test complexity can be reduced.

Description

Technical Field

[0001] The present application relates to the field of engine testing technology, and in particular to a variable valve timing control system and a control method, control device and equipment thereof. Background Art

[0002] During the bench testing and calibration of the engine, the timing of the engine camshaft is usually changed through VVT (Variable Valve Timing) control technology to achieve control of the valve overlap angle. There are currently two control methods: hydraulic VVT and electric VVT. The hydraulic VVT control technology controls the oil flow on both sides of the rotor connected to the cam to make it rotate relative to the stator connected to the timing sprocket, thereby adjusting the phase. The electric VVT control technology is a motor-driven VVT system that controls the speed of the motor relative to the camshaft through the camshaft, causing a phase difference between the rotor and the stator, thereby achieving the forward adjustment, backward adjustment and stability of the variable valve timing.

[0003] However, the current hydraulic VVT control technology and electric VVT control technology require the configuration of a dedicated ECU for signal acquisition and control signal output. When the engine uses a new mechanism and needs to be tested, a dedicated ECU needs to be purchased again. Therefore, the current variable valve timing control method has the problem of high test complexity. Summary of the invention

[0004] Based on this, it is necessary to provide a variable valve timing control system and its control method, control device and equipment that can reduce costs in order to address the above technical problems.

[0005] A variable valve timing control system, comprising:

[0006] An engine electronic control unit, used for receiving a crankshaft position sensor signal and a camshaft position sensor signal of the engine, determining an actual valve timing of the camshaft, and generating an oil control valve control signal based on the actual valve timing and a preset target valve timing; the oil control valve control signal is used for controlling the oil control valve to adjust the actual valve timing to the preset target valve timing;

[0007] A data conversion module is connected to the engine electronic control unit, and is used to receive the crankshaft position sensor signal, the camshaft position sensor signal, the engine motor feedback signal and the oil control valve control signal in real time, generate a motor drive signal, and transmit the motor drive signal to the motor; the motor drive signal is used to control the motor to adjust the speed to the target speed corresponding to the preset target valve timing.

[0008] In one embodiment, the system further comprises:

[0009] A sensor module, wherein the sensor module is connected to the engine electronic control unit and the data conversion module respectively, and the sensor module is used to collect the crankshaft position sensor signal and the camshaft position sensor signal in real time, and send the crankshaft position sensor signal and the camshaft position sensor signal to the engine electronic control unit and the data conversion module respectively.

[0010] In one embodiment, the system further comprises:

[0011] A motor is connected to the data conversion module, and the motor is used to send the motor feedback signal to the data conversion module in real time, and adjust the rotation speed to the target rotation speed in response to the motor drive signal.

[0012] In one embodiment, the motor feedback signal includes: one or more of a motor speed feedback signal, a motor direction feedback signal, and a state monitoring feedback signal.

[0013] In one embodiment, the system further comprises:

[0014] An oil control valve is connected to the engine electronic control unit, and is used to adjust the oil flow rate and oil flow direction to a target oil flow rate and target oil flow direction corresponding to the preset target valve timing in response to the oil control valve control signal.

[0015] A variable valve timing control method, applied to the data conversion module of the variable valve timing control system described in the above embodiment, comprises:

[0016] Receive crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals, and oil control valve control signals in real time;

[0017] A motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, a motor feedback signal of the engine, and the oil control valve control signal, and the motor drive signal is sent to the motor of the engine.

[0018] In one embodiment, the motor feedback signal includes: one or more of a motor speed feedback signal, a motor steering feedback signal, and a state monitoring feedback signal, and the motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor feedback signal of the engine, and the oil control valve control signal, including:

[0019] Determining the working state of the motor according to the state monitoring feedback signal;

[0020] When the working state of the motor is normal operation, a motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal and the oil control valve control signal.

[0021] In one embodiment, generating a motor drive signal according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal and the oil control valve control signal includes:

[0022] Determining a control strategy according to the oil control valve control signal;

[0023] Determining a target wheel speed of the motor according to the control strategy, the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, and the motor steering feedback signal;

[0024] A motor drive signal is generated according to the control strategy and the target wheel speed; the motor drive signal is used to adjust the actual wheel speed of the motor to the target wheel speed, so as to advance, maintain or retard the actual valve timing to a preset target valve timing.

[0025] A variable valve timing control device, applied to the data conversion module of the variable valve timing control system described in the above embodiment, comprises:

[0026] A signal receiving module, used for receiving crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals and oil control valve control signals in real time;

[0027] The motor drive module is used to generate a motor drive signal according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor feedback signal of the engine and the oil control valve control signal, and send the motor drive signal to the motor of the engine.

[0028] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0029] Receive crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals, and oil control valve control signals in real time;

[0030] A motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, a motor feedback signal of the engine, and the oil control valve control signal, and the motor drive signal is sent to the motor of the engine.

[0031] The variable valve timing control system and its control method, control device and equipment, the system includes an engine electronic control unit and a data conversion module; wherein the engine electronic control unit is used to receive the crankshaft position sensor signal and the camshaft position sensor signal of the engine, determine the actual valve timing of the camshaft, and generate an oil control valve control signal based on the actual valve timing and the preset target valve timing, so as to control the hydraulic variable valve timing; the data conversion module is connected to the engine electronic control unit, and is used to receive the crankshaft position sensor signal, the camshaft position sensor signal, the engine motor feedback signal and the oil control valve control signal in real time, generate a motor drive signal, and transmit the motor drive signal to the motor, wherein the motor drive signal is used to control the motor to adjust the speed to the target speed corresponding to the preset target valve timing, and convert the oil valve control signal into a motor drive signal adapted to the electric variable valve timing control, so that the same engine electronic control unit can control both the hydraulic variable valve timing and the electric variable valve timing, and there is no need to purchase an engine electronic control unit with special functions to realize the control and testing of the engine, thereby reducing the complexity of the test and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] FIG1 is a structural diagram of a hydraulic VVT control system in the related art;

[0034] FIG2 is a structural diagram of an electric VVT control system in the related art;

[0035] FIG3 is a schematic diagram of the structure of a variable valve timing control system in one embodiment;

[0036] FIG4 is a flow chart of a variable valve timing control method in one embodiment;

[0037] FIG5 is a flow chart of a variable valve timing control method in another embodiment;

[0038] FIG6 is a block diagram of a variable valve timing control device in one embodiment;

[0039] FIG. 7 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0043] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is transmission of electrical signals or data between the connected objects.

[0044] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0045] As described in the background technology, the variable valve timing control method in the related art has the problem of high test complexity. The inventor has found that the reason for this problem is that the hydraulic VVT control system and the electric VVT control system are currently mainly used. As shown in Figure 1, a structural diagram of the hydraulic VVT control system in the related art is provided. The hydraulic VVT control system controls the oil flow on both sides of the rotor connected to the cam, so that the rotor rotates relative to the stator connected to the timing sprocket, thereby performing phase adjustment. Among them, the OCV valve (Oil Control Valve) is a PWM (Pulse Width Modulation) type electromagnetic control valve. The oil is supplied to the engine by the engine oil pump after being controlled by the OCV valve. The control signal of the OCV valve is generated by the engine electronic control after calculating the relative position of the rotor and the stator based on the crankshaft and camshaft position sensor signals. As shown in FIG2 , a structural diagram of an electric VVT control system in the related art is provided. The electric VVT control system is a motor-driven VVT system. The camshaft controls the speed of the motor relative to the camshaft, so that the rotor and the stator have a phase difference, thereby realizing the front adjustment, rear adjustment and stability of the valve timing. The motor drive signal of the motor is generated by the motor electronic control unit according to the crankshaft and camshaft position sensor signals and the motor feedback signal. However, at present, for engines equipped with hydraulic VVT and electric VVT, each electronic control unit with its own dedicated function is used for signal acquisition and control signal output. It is necessary to develop and purchase an electronic control unit with dedicated control software and hardware functions to realize the control and testing of the engine. When the engine adopts a new mechanism and needs to be tested, a large amount of development and procurement costs are required, and the test cycle is extended.

[0046] Based on the above reasons, the present invention provides a variable valve timing control system and a control method, a control device and an apparatus thereof, which can be adapted to both hydraulic VVT and electric VVT, thereby reducing the complexity of testing.

[0047] In one embodiment, as shown in FIG3 , a variable valve timing control system is provided, comprising:

[0048] Engine electronic control unit 301 and data conversion module 302 .

[0049] Among them, the engine electronic control unit 301 is used to receive the engine crankshaft position sensor signal and the engine camshaft position sensor signal, determine the actual valve timing of the camshaft, and generate an oil control valve control signal based on the actual valve timing and the preset target valve timing; the data conversion module 302 is connected to the engine electronic control unit 301, and is used to receive the crankshaft position sensor signal, the camshaft position sensor signal, the engine motor feedback signal and the oil control valve control signal in real time, generate a motor drive signal, and transmit the motor drive signal to the motor.

[0050] Among them, the engine electronic control unit 301 can be an engine ECU (Electronic Control Unit), which is a computer system used by the vehicle to control various functions, and can adjust the operation of multiple systems such as engine management, transmission control, air suspension, brake system, body stability system, etc. Among them, the engine can be a machine that converts chemical energy into mechanical energy, mainly composed of cylinders, pistons, crankshafts, camshafts and other components. Among them, the crankshaft is an important component in the engine. It converts the reciprocating motion of the piston into rotational motion. The rotation of the crankshaft directly drives the tires of the vehicle and affects the output power and torque of the engine. Among them, the camshaft is a component that controls the opening and closing of the valve, which is usually connected to the crankshaft. The shape of the cam on the camshaft determines the opening stroke and time of the valve, thereby affecting the timing of the valve.

[0051] Among them, valve timing refers to the angle and timing of the opening and closing of the valves in the engine relative to the rotation of the crankshaft.

[0052] The oil control valve control signal is used to control the oil control valve to adjust the actual valve timing to a preset target valve timing.

[0053] The motor drive signal is used to control the motor to adjust the speed to a target speed corresponding to a preset target valve timing.

[0054] It is understandable that the engine electronic control unit 301 can select the engine electronic control unit 301 corresponding to the hydraulic optional valve timing control system. When the variable valve timing to be controlled is hydraulic, the engine electronic control unit 301 is connected to the oil control valve. The engine electronic control unit 301 can calculate the actual position of the camshaft through the crankshaft position sensor signal and the camshaft position sensor signal of the engine, thereby determining the actual valve timing of the camshaft. The preset valve timing set according to the actual engine requirements is obtained, and the engine electronic control unit 301 compares the actual valve timing with the preset valve timing according to the software control strategy, and determines the actual valve timing to reach the preset valve timing, and the phase value that needs to be adjusted, thereby generating an oil control valve control signal. When the variable valve timing to be controlled is hydraulic, the engine electronic control unit 301 sends the oil control valve control signal to the oil control valve to control the oil control valve to adjust the actual valve timing of the camshaft; when the variable valve timing to be controlled is electric, the engine electronic control unit 301 sends the oil control valve control signal to the data conversion module 302 for further processing. The hydraulic variable valve timing and the electric variable valve timing are controlled by the same engine electronic control unit 301, and there is no need to set up the engine electronic control unit 301 with the corresponding software version for both.

[0055] In addition, when the variable valve timing to be controlled is electric, the data conversion module 302 receives the oil control valve control signal sent by the engine electronic control unit 301, determines the variable valve adjustment strategy suitable for the motor according to the control strategy of the oil control signal and the motor feedback signal of the engine, and generates a corresponding motor drive signal, thereby controlling the motor to adjust the actual valve timing of the camshaft to the preset target valve timing.

[0056] In the above variable valve timing control system, the system includes an engine electronic control unit 301 and a data conversion module 302; wherein the engine electronic control unit 301 is used to receive the crankshaft position sensor signal of the engine and the camshaft position sensor signal of the engine, determine the actual valve timing of the camshaft, and generate an oil control valve control signal based on the actual valve timing and the preset target valve timing to achieve control of the hydraulic variable valve timing; the data conversion module 302 is connected to the engine electronic control unit 301, and is used to receive the crankshaft position sensor signal, the camshaft position sensor signal, the engine electronic control unit 301 in real time, and generate an oil control valve control signal based on the actual valve timing and the preset target valve timing to achieve control of the hydraulic variable valve timing. The engine feedback signal and the oil control valve control signal are used to generate a motor drive signal, and the motor drive signal is transmitted to the motor, wherein the motor drive signal is used to control the motor to adjust the speed to the target speed corresponding to the preset target valve timing, and the oil valve control signal is converted into a motor drive signal adapted to the electric variable valve timing control, so that the same engine electronic control unit 301 can control both the hydraulic variable valve timing and the electric variable valve timing, and there is no need to purchase an engine electronic control unit 301 with special functions to realize engine control and testing, thereby reducing the complexity of the test and reducing the cost.

[0057] In an exemplary embodiment, referring to FIG. 3 , the variable valve timing control system described in the above embodiment further includes:

[0058] Sensor module 303; wherein the sensor module 303 is connected to the engine electronic control unit 301 and the data conversion module 302 respectively, and the sensor module 303 is used to collect the crankshaft position sensor signal and the camshaft position sensor signal in real time, and send the crankshaft position sensor signal and the camshaft position sensor signal to the engine electronic control unit 301 and the data conversion module 302 respectively.

[0059] It can be understood that the sensor module 303 includes a crankshaft position sensor and a camshaft position sensor, which are respectively connected to the engine electronic control unit 301 and the data conversion module 302; the crankshaft position sensor is used to collect the crankshaft position sensor signal of the engine, and send the crankshaft position sensor signal to the engine electronic control unit 301 and the data conversion module 302 respectively, and the camshaft position sensor is used to collect the camshaft position sensor signal of the engine, and send the camshaft position sensor signal to the engine electronic control unit 301 and the data conversion module 302 respectively. It paves the way for the subsequent determination of the actual valve timing of the camshaft, the generation of the oil control valve signal and the motor drive signal, and provides data support for the variable valve timing control system to realize the control of the hydraulic variable valve timing and the electric variable valve timing.

[0060] In an exemplary embodiment, referring to FIG. 3 , the variable valve timing control system described in the above embodiment further includes:

[0061] The motor 304 is connected to the data conversion module 302, and the motor 304 is used to send a motor feedback signal to the data conversion module 302 in real time, and to adjust the rotation speed to the target rotation speed in response to the motor drive signal.

[0062] The motor feedback signal includes one or more of a motor speed feedback signal, a motor direction feedback signal and a state monitoring feedback signal.

[0063] It can be understood that the motor 304 can be mounted on the crankshaft of the engine, and the camshaft is driven to rotate by the crankshaft. The motor drive signal controls the motor 304 to increase, decrease or maintain the speed relative to the camshaft, thereby achieving the actual valve timing to be adjusted forward, backward or remain unchanged.

[0064] It should be noted that when the engine controlled by the optional valve timing control system is an electric variable valve timing, the motor 304 of the engine is connected to the data conversion module 302 of the optional valve timing control system. When the engine controlled by the optional valve timing control system is a hydraulic variable valve timing, the data conversion module 302 may not work. In a preferred embodiment, the motor feedback signal sent by the motor 304 to the data conversion module 302 includes a motor speed feedback signal, a motor steering feedback signal, and a status monitoring feedback signal, so that the data conversion module 302 can grasp the current operation status of the motor 304 from multiple dimensions, assist the data conversion module 302 in controlling the motor 304, and understand the operation status of the motor 304 so that the data conversion module 302 can more accurately convert the control strategy of the oil control valve into the motor control strategy.

[0065] In an exemplary embodiment, referring to FIG. 3 , the variable valve timing control system described in the above embodiment further includes:

[0066] Oil control valve 305; wherein, the oil control valve 305 is connected to the engine electronic control unit 301, and the oil control valve 305 is used to respond to the oil control valve control signal to adjust the oil flow and oil flow direction to the target oil flow and target oil flow direction corresponding to the preset target valve timing.

[0067] It should be noted that, when the variable valve timing control system needs to control the hydraulic variable valve timing, the engine electronic control unit 301 is connected to the oil control valve 305; when the variable valve timing control system does not need to control the hydraulic variable valve timing, the engine electronic control unit 301 is not connected to the oil control valve 305. The oil control valve 305 responds to the oil control valve control signal to control the oil flow and oil flow direction of the oil chambers corresponding to the two sides of the rotor connected to the camshaft of the engine. The pressure difference generated by the oil flowing into the two oil chambers respectively causes the rotor to drive the camshaft to rotate, thereby achieving the purpose of adjusting the actual valve timing of the camshaft to the preset target valve timing, and realizing the accurate control of the hydraulic variable valve timing by the variable valve timing control system.

[0068] In an exemplary embodiment, as shown in FIG. 4 , a variable valve timing control method is provided, which is applied to a data conversion module of a variable valve timing control system described in any one of the above embodiments, and includes:

[0069] Step S402, receiving the crankshaft position sensor signal, the camshaft position sensor signal, the engine motor feedback signal and the oil control valve control signal in real time.

[0070] The motor of the engine may be a DC motor or a stepper motor, which drives the valve stroke in response to the motor control signal, thereby achieving optimal valve timing adjustment under different speeds and loads. The click feedback signal may be the working state and working parameters fed back by the motor to the data conversion module.

[0071] Optionally, the data conversion module receives the crankshaft position sensor signal and camshaft position sensor signal of the sensor module in real time, receives the motor feedback signal of the engine's motor, and the oil control valve control signal sent by the engine electronic control unit as data support.

[0072] Step S404, generating a motor drive signal according to the crankshaft position sensor signal, the camshaft position sensor signal, the engine motor feedback signal and the oil control valve control signal, and sending the motor drive signal to the engine motor.

[0073] The motor drive signal is used to control the motor of the engine to adjust the speed to a target speed corresponding to a preset target valve timing.

[0074] Optionally, the data conversion module calculates the actual speed and phase of the camshaft based on the crankshaft position sensor signal and the camshaft position sensor signal, determines the current working state and working parameters of the motor based on the engine motor feedback signal, and determines the control strategy of the engine electronic control unit based on the oil control valve control signal. Furthermore, based on the actual speed and phase of the camshaft, the current working state and working parameters of the motor, and the control strategy of the engine electronic control unit, a motor drive signal is generated and sent to the engine motor.

[0075] In this embodiment, the data conversion module receives data of multiple dimensions currently associated with the valve timing of the engine as data support, and further converts the oil control valve control signal used by the engine electronic control unit to control the hydraulic variable valve timing into a motor drive signal, thereby enabling the engine electronic control unit used to control the hydraulic variable valve timing to control the electric variable valve timing, avoiding the need to set up engine electronic control units with special functions for the two respectively. Only one engine electronic control unit can be used to control two types of variable valve timing, thereby reducing costs.

[0076] In an exemplary embodiment, the motor feedback signal includes: one or more of a motor speed feedback signal, a motor steering feedback signal, and a state monitoring feedback signal. Step S504 generates a motor drive signal according to a crankshaft position sensor signal, a camshaft position sensor signal, a motor feedback signal of the engine, and an oil control valve control signal, and sends the motor drive signal to the motor of the engine, including:

[0077] The working state of the motor is determined according to the state monitoring feedback signal; when the working state of the motor is normal operation, the motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal and the oil control valve control signal.

[0078] The status monitoring signal is data obtained by monitoring the working status of the motor, and is used to reflect the operating conditions of the motor, including normal operation and abnormality, as well as the type of abnormal fault.

[0079] Optionally, the data conversion module determines the working state of the motor according to the state monitoring feedback signal, stops the motor from working when the working state is abnormal, and performs alarm processing in a preset manner. When the working state of the motor is normal, the data conversion module determines the motor control strategy corresponding to adjusting the current actual valve timing to the preset target valve timing according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal, and the oil control valve control signal, and generates a motor drive signal.

[0080] In this embodiment, the working state of the motor is determined by the state monitoring feedback signal fed back by the motor, the motor fault is discovered in time and corresponding measures are taken, and the motor drive signal is generated to adjust and control the motor only when it is determined that the motor is working normally, thereby improving the reliability of the system.

[0081] In an exemplary embodiment, the steps of the above embodiment generate a motor drive signal according to a crankshaft position sensor signal, a camshaft position sensor signal, a motor speed feedback signal, a motor steering feedback signal, and an oil control valve control signal, including:

[0082] Determine the control strategy based on the oil control valve control signal; determine the target wheel speed of the motor based on the control strategy, the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal and the motor steering feedback signal; generate the motor drive signal based on the control strategy and the target wheel speed.

[0083] The motor drive signal is used to adjust the actual wheel speed of the motor to the target wheel speed, so as to advance, maintain or retard the actual valve timing to the preset target valve timing.

[0084] The target wheel speed may be a motor wheel speed corresponding to a preset target valve timing.

[0085] Optionally, the data conversion module determines the control strategy including the adjustment method and the phase difference to be adjusted according to the oil control valve control signal, such as adjusting the actual valve timing forward, backward or unchanged. The data conversion module determines the actual wheel speed and actual phase of the camshaft according to the crankshaft position sensor signal and the camshaft position sensor signal. In addition, the current direction of the motor is determined according to the motor speed feedback signal, and the current wheel speed of the motor is determined according to the motor steering feedback signal. Further, the data conversion module calculates the target wheel speed of the motor according to the phase difference to be adjusted, the actual wheel speed and actual phase of the camshaft, the direction of the motor and the wheel speed of the motor. According to the control strategy and the target wheel speed, a motor drive signal is generated to achieve the control of adjusting the actual valve timing forward, backward or unchanged.

[0086] In this embodiment, the data conversion module clarifies the valve timing adjustment strategy based on the control signal of the oil control valve, and determines the target wheel speed of the motor by integrating the multi-dimensional data of the engine, and generates a corresponding motor drive signal to control the valve timing, thereby achieving dynamic and accurate adjustment of the valve timing.

[0087] In an exemplary embodiment, another variable valve timing control method is provided, as shown in FIG5 , which specifically includes:

[0088] The engine ECU (Engine Electronic Control Unit) is used to calculate and set the valve timing according to the engine operating conditions, that is, the target position (preset target valve timing); and calculate the actual position of the camshaft (actual valve timing) based on the collected signals of the crankshaft position sensor and the cam position sensor. The ECU compares the target position with the actual position, and sends out an OCV valve control signal according to the control strategy of the ECU software to achieve the advance, lag, or maintain the VVT ​​phase, and adjust the camshaft timing angle. Optionally, the OCV valve control signal as a control signal of the hydraulic VVT cannot control the electric VVT, so the control of the electric VVT is achieved by designing a data conversion module.

[0089] The data conversion module is used to collect the crankshaft position sensor signal and the camshaft position sensor signal according to the crankshaft position sensor signal and the camshaft position sensor signal, and calculate the camshaft speed and phase; collect the motor speed feedback signal of the electric VVT according to the motor speed feedback signal, and calculate the current motor speed; collect the motor steering feedback signal of the electric VVT according to the motor steering feedback signal, and read the current motor steering; collect the state monitoring feedback signal of the electric VVT according to the state monitoring feedback signal, read the current state information of the electric VVT, and make a corresponding response according to the state information; collect the OCV valve control signal sent by the ECU according to the OCV valve control signal, and read the ECU's advance, lag, and hold instructions for the VVT ​​phase according to the engine working condition; calculate the current target speed of the motor according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal, the state monitoring feedback signal and the OCV valve control signal according to the corresponding control strategy, generate a motor drive signal and send it to the motor drive signal end of the electric VVT, control the speed of the motor relative to the camshaft, and realize the front adjustment, rear adjustment and position holding of the cam timing.

[0090] In this embodiment, the OCV valve control signal of the ECU with hydraulic VVT function and the feedback signal of the electric VVT are processed by the data conversion module to generate corresponding motor drive signals to control and adjust the electric VVT. In the engine bench test, the purpose of using one ECU to control two types of VVT is achieved, which can save the time and procurement cost of developing new dedicated ECU software and hardware to deal with different VVT mechanisms.

[0091] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0092] Based on the same inventive concept, the embodiment of the present application also provides a variable valve timing control device for implementing the variable valve timing control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more variable valve timing control device embodiments provided below can refer to the limitations of the variable valve timing control method above, and will not be repeated here.

[0093] In one embodiment, as shown in FIG. 6 , a variable valve timing control device 600 is provided, comprising: a signal receiving module 601 and a motor driving module 602 , wherein:

[0094] The signal receiving module 601 is used to receive the crankshaft position sensor signal, the camshaft position sensor signal, the engine motor feedback signal and the oil control valve control signal in real time.

[0095] The motor drive module 602 is used to generate a motor drive signal according to a crankshaft position sensor signal, a camshaft position sensor signal, an engine motor feedback signal and an oil control valve control signal, and send the motor drive signal to the engine motor.

[0096] Furthermore, in one embodiment, the motor drive module 602 is also used to determine the working state of the motor based on the state monitoring feedback signal; when the working state of the motor is normal operation, a motor drive signal is generated based on the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal and the oil control valve control signal.

[0097] Further, in one embodiment, the motor driving module 602 is also used to determine the control strategy according to the oil control valve control signal;

[0098] The target wheel speed of the motor is determined according to the control strategy, the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal and the motor steering feedback signal; the motor drive signal is generated according to the control strategy and the target wheel speed; the motor drive signal is used to adjust the actual wheel speed of the motor to the target wheel speed, so as to advance, maintain or retard the actual valve timing to the preset target valve timing.

[0099] Each module in the variable valve timing control device 600 can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0100] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG7. The computer device includes a processor, a memory, and a network interface connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data such as crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals, and oil control valve control signals. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a variable valve timing control method is implemented.

[0101] Those skilled in the art will understand that the structure shown in FIG. 7 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0102] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0103] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0104] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0105] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0106] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0107] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A variable valve timing control system, characterized in that: include: An engine electronic control unit, used for receiving a crankshaft position sensor signal and a camshaft position sensor signal of the engine, determining an actual valve timing of the camshaft, and generating an oil control valve control signal based on the actual valve timing and a preset target valve timing; the oil control valve control signal is used for controlling the oil control valve to adjust the actual valve timing to the preset target valve timing; A data conversion module is connected to the engine electronic control unit, and is used to receive the crankshaft position sensor signal, the camshaft position sensor signal, the engine motor feedback signal and the oil control valve control signal in real time, generate a motor drive signal, and transmit the motor drive signal to the motor; the motor drive signal is used to control the motor to adjust the speed to the target speed corresponding to the preset target valve timing.

2. The variable valve timing control system according to claim 1, characterized in that: The system further comprises: A sensor module, wherein the sensor module is connected to the engine electronic control unit and the data conversion module respectively, and the sensor module is used to collect the crankshaft position sensor signal and the camshaft position sensor signal in real time, and send the crankshaft position sensor signal and the camshaft position sensor signal to the engine electronic control unit and the data conversion module respectively.

3. The variable valve timing control system according to claim 1, characterized in that: The system further comprises: A motor is connected to the data conversion module, and the motor is used to send the motor feedback signal to the data conversion module in real time, and adjust the rotation speed to the target rotation speed in response to the motor drive signal.

4. The variable valve timing control system according to any one of claims 1 to 3, characterized in that: The motor feedback signal includes: one or more of a motor speed feedback signal, a motor direction feedback signal and a state monitoring feedback signal.

5. The variable valve timing control system according to claim 1, characterized in that: The system further comprises: An oil control valve is connected to the engine electronic control unit, and is used to adjust the oil flow rate and oil flow direction to a target oil flow rate and target oil flow direction corresponding to the preset target valve timing in response to the oil control valve control signal.

6. A variable valve timing control method, characterized in that: A data conversion module for a variable valve timing control system according to any one of claims 1 to 5, comprising: Receive crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals, and oil control valve control signals in real time; A motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, a motor feedback signal of the engine, and the oil control valve control signal, and the motor drive signal is sent to the motor of the engine.

7. The variable valve timing control method according to claim 6, characterized in that: The motor feedback signal includes: one or more of a motor speed feedback signal, a motor steering feedback signal, and a state monitoring feedback signal. The motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor feedback signal of the engine, and the oil control valve control signal, including: Determining the working state of the motor according to the state monitoring feedback signal; When the working state of the motor is normal operation, a motor drive signal is generated according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal and the oil control valve control signal.

8. The variable valve timing control method according to claim 7, characterized in that: The step of generating a motor drive signal according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, the motor steering feedback signal and the oil control valve control signal comprises: Determining a control strategy according to the oil control valve control signal; Determining a target wheel speed of the motor according to the control strategy, the crankshaft position sensor signal, the camshaft position sensor signal, the motor speed feedback signal, and the motor steering feedback signal; A motor drive signal is generated according to the control strategy and the target wheel speed; the motor drive signal is used to adjust the actual wheel speed of the motor to the target wheel speed, so as to advance, maintain or retard the actual valve timing to a preset target valve timing.

9. A variable valve timing control device, characterized in that: A data conversion module for a variable valve timing control system according to any one of claims 1 to 5, comprising: A signal receiving module, used for receiving crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals and oil control valve control signals in real time; The motor drive module is used to generate a motor drive signal according to the crankshaft position sensor signal, the camshaft position sensor signal, the motor feedback signal of the engine and the oil control valve control signal, and send the motor drive signal to the motor of the engine.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 6 to 8 are implemented.

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