71 results about "Variable valve timing" patented technology

A valve timing control device includes: a unit for calculating a target valve timing for one of an intake valve and an exhaust valve in accordance with an operational state; a unit for detecting an actual valve timing of one of the intake valve and the exhaust valve; an actual valve timing control unit for generating a controlled variable for the VVT based on a difference between the target valve timing and the actual valve timing; a unit for learning a learning value of the controlled variable required for maintenance of the actual valve timing based on an integral correction value; and a unit for detecting a malfunction in a VVT from an amount of a shift in the actual valve timing when learning is not completed yet, and for detecting a malfunction in the VVT from the difference when learning is already completed.

The invention discloses a dual-fuel engine combustion control method based on hydrogen-ammonia energy ratio and gas distribution overlap angle regulation and control, which comprises the following steps: 1) fuel ratio control: acquiring current operation state parameters of an engine, determining a target AER according to preset mapping, regulating ammonia gas supply quantity and hydrogen supply quantity to enable the actual AER to reach the target AER, and controlling the fuel ratio; the AER is adaptively set according to engine load and combustion stability conditions; 2) valve timing control: adjusting the opening time of an intake valve or the closing time of an exhaust valve through a variable valve timing mechanism so as to change a valve timing overlap angle VOA, wherein the VOA is set to be a negative value, a small overlap angle or a positive overlap angle according to the working condition of an engine; (3) injection time sequence optimization is conducted, specifically, the injection time of ammonia gas and the in-cylinder direct injection time of hydrogen are controlled respectively, and coordinated optimization of a fuel injection strategy and valve timing is achieved; and 4) closed-loop steady-state control: monitoring a combustion state and an emission index in real time, comparing the combustion state and the emission index with a threshold value to serve as a feedback signal, and correcting the target AER and VOA settings in time. According to the dual-fuel engine combustion control method based on regulation and control of the hydrogen-ammonia energy ratio and the gas distribution overlapping angle, the energy ratio of hydrogen fuel and ammonia fuel and the overlapping opening angle of an intake valve and an exhaust valve are dynamically adjusted under different working conditions, so that the combustion reaction rate and temperature are coordinated, and the stable and efficient combustion process is achieved; and harmful emissions of NOx, unburned ammonia and the like are obviously reduced.

The invention discloses a control method and system of a hybrid vehicle and the hybrid vehicle, and relates to the technical field of vehicles. The method comprises the following steps: acquiring a plurality of sensing signals of the hybrid vehicle; identifying working state differences among cylinders of the engine based on the plurality of sensing signals; and in response to the recognized working state difference, layered control is conducted on an oil injection mechanism, a variable valve timing mechanism and an ignition mechanism, and a P2 motor is controlled. Therefore, the combustion stability, NVH performance and efficiency of the engine under the hybrid working condition can be improved.

According to the engine system, the intake valve of the engine body is connected with the intake pipeline, and the exhaust valve of the engine body is connected with the exhaust pipeline, so that normal operation of the engine body is achieved; the engine body comprises a variable valve timing system, and the variable valve timing system comprises at least three different VVT MAPs used for controlling opening timing of an intake valve and closing timing of an exhaust valve so as to control the engine system under different operation conditions. According to the invention, the air inlet amount of the engine body can reach the best under different operation conditions, so that the engine system can reach higher combustion efficiency under different operation conditions, the oil consumption is reduced, and the economical efficiency of the engine system in the operation process is improved.

This internal combustion engine (1) has a hydraulically driven variable valve timing mechanism (8) capable of changing the valve timing of an engine valve. To change the valve timing of the engine valve, the internal combustion engine (1) temporarily increases the working hydraulic pressure supplied to the variable valve timing mechanism (8) to a target hydraulic pressure (Pt) at the time of switching. To change the valve timing of the engine valve, when the working hydraulic pressure becomes equal to or higher than a predetermined control-permission hydraulic pressure (Pc) lower than the target hydraulic pressure (Pt) at the time of switching, the internal combustion engine (1) starts control of the variable valve timing mechanism (8) to change the valve timing of the engine valve.

internal combustion engine (8) comprising a camshaft (1) which drives at least one inlet valve (5) with which a fluid inlet in a cylinder (9) of the internal combustion engine (8) can be controlled, - wherein the camshaft (1) comprises at least one cam (2), - wherein the cam (2) has at least a valve opening elevation (7) and a control projection (3,4), - wherein the valve opening lift (7) is arranged to open the inlet valve (5) to a maximum stroke, - wherein the inlet valve (5) is open at least during part of a compression movement of a piston (6) of the internal combustion engine (8) associated with the inlet valve (5) in order to decompress the cylinder (9), - wherein the inlet valve (5) can be controlled by the camshaft (1) via a variable valve timing system, and - wherein the variable valve control allows the valve lift of the inlet valve (5) to be adjusted, - wherein by adjusting the valve lift of the intake valve (5) the operation of the internal combustion engine (8) can be switched between depending on a speed of the internal combustion engine (8) ◯ an operation with early closing of the inlet valve (5) at high speeds, and ◯ an operation with late closing of the inlet valve (5) after the bottom dead center of the piston (6) at low speeds, - characterized by the fact that ◯ the operation with early closing of the inlet valve (5) before a bottom dead center of the piston (6) is adjustable by a small valve lift, and ◯ the operation with late closing of the inlet valve (5) is adjustable by a large valve lift.

Systems and methods for exhaust composition management during stochastic pre-ignition mitigation are provided. Combustion event data is received from at least one combustion event sensor associated with a plurality of cylinders. Each cylinder includes a combustion chamber, an intake valve, and an exhaust valve. Opening the intake valve allows air to flow from the intake manifold into the combustion chamber. Opening the exhaust valve allows air to flow from the combustion chamber to the exhaust manifold. When a determination is made that an SPI event has occurred in at least one of the cylinders based on the combustion event data, a command is issued to a variable valve timing (VVT) system to achieve a valve timing overlap for each of the plurality of cylinders during which intake valves and exhaust valves of the cylinders are simultaneously placed in open positions.

The application discloses a variable timing valve opening degree measurement method, device, storage medium and vehicle, and relates to the technical field of variable valve timing control, and can be used for measuring the opening degree of a variable timing valve. The method comprises the following steps: acquiring a camshaft signal wheel duty cycle signal of a camshaft signal wheel, and determining base tooth position information of the camshaft signal wheel according to the camshaft signal wheel duty cycle signal; acquiring crankshaft signal wheel sensor measurement information of a crankshaft signal wheel, and determining flag tooth position information of the crankshaft signal wheel according to the crankshaft signal wheel sensor measurement information; and determining the real-time opening degree of the variable timing valve according to the base tooth position information, the flag tooth position information and zero position information.

To improve startability of an engine regardless of a state of a lock pin in a variable valve train in an engine control device.SOLUTION: An engine control device 30 includes a setting part 31 and a control part 32. When the engine 1 is stopped, the setting unit 31 sets the flag to ON if the oil temperature of the engine oil that drives the variable valve mechanism 10 is equal to or lower than a predetermined temperature, and sets the flag to OFF if the oil temperature exceeds the predetermined temperature. At the start of the engine 1, the control unit 32 performs the normal control when the flag is off, and performs the scavenging control and the normal control when the flag is on. The normal control is a control for starting the engine 1 by cranking while performing both fuel injection and ignition. The scavenging control is control for scavenging the inside of the combustion chamber by cranking without performing both fuel injection and ignition.SELECTED DRAWING: Figure 1

The invention relates to the technical field of engine control, and particularly discloses an evaluation method and device for variable valve timing of an engine, a storage medium and a vehicle. The evaluation method for the variable valve timing of the engine comprises the steps that multiple evaluation dimensions of the variable valve timing of the engine are obtained; establishing an analysis template and an evaluation standard of each evaluation dimension; determining a single evaluation score of each evaluation dimension according to the analysis template and the evaluation criteria; obtaining a weight coefficient of each single evaluation score; and determining the total evaluation score of the variable valve timing of the engine according to each single evaluation score and the corresponding weight coefficient, thereby improving the evaluation accuracy of the variable valve timing and saving human resources.

The present application relates to a kind of control method, device, vehicle and storage medium, wherein, control method includes: obtaining engine speed, engine actual load and the engine target load corresponding to set type;According to engine speed, engine actual load and engine target load, the target angle corresponding to the set type of variable valve timing mechanism is determined;According to target angle, the angle corresponding to the set type of variable valve timing mechanism is controlled.According to the above technical means, when engine target load is rapidly reduced and engine actual load is larger, the target angle corresponding to the set type of variable valve timing mechanism can be limited, so that the target angle corresponding to the set type is set to the angle that does not produce over-blast, thereby reducing the probability of over-blast occurrence, to protect engine, and better driving performance can be obtained.

The utility model belongs to the technical field of engine oil control valves of variable valve timing systems, and particularly relates to a central control valve. The central control valve comprises a valve shell provided with a cavity; the valve sleeve assembly is arranged in the cavity and comprises a valve sleeve and an oil guide sleeve, the valve sleeve and the oil guide sleeve are provided with an oil inlet, a first oil outlet and a second oil outlet, and the oil inlet is located between the first oil outlet and the second oil outlet; and the valve element is movably arranged in the oil guide sleeve, and a check ring is arranged on the valve shell. One end of the valve sleeve abuts against the valve shell through the check ring, and the other end of the valve sleeve abuts against the valve shell through the valve seat and is provided with a channel and an oil passing hole. A metal spring seat is arranged in the channel, and the spring seat and the valve sleeve are formed in an injection molding mode. The valve element abuts against the check ring through the first spring. One end of the ball abuts against the spring seat through the second spring, and the other end of the ball abuts against the valve seat. Therefore, the problems that in the prior art, a control valve is complex to assemble and low in efficiency are solved.

A method (100) for controlling a boosted spark-ignition internal combustion engine (10), the engine comprising a heat exchanger mounted downstream of a compressor of a boosting system and a variable valve timing system (27) configured to control a valve lift (VVT) between an exhaust bottom dead center (exhaust BDC), a top dead center (TDC), and an intake bottom dead center (intake BDC), wherein:-the mass (Mwater) of the liquid water stored on the inner wall of the exchanger (26) is estimated in real time; -comparing the estimated mass (Mwater) with a threshold (S); and-initiating a purge of the cooler (26) when the estimated mass (Mwater) of water is greater than a threshold (S), causing an oscillation of the intake volumetric flow (Qvol) into the exchanger (26) between the nominal volumetric flow value (Qvolname) and the increased volumetric flow value (Qvol +).

The variable duration valve train controls the flow of air into the combustion chambers of the combustion engine. The variable duration valve train includes a drive cylinder structure, a stroke limit cylinder structure, an engine valve structure, a plurality of cams, and a working fluid. The engine valve structure attaches to the drive cylinder structure. The stroke limit cylinder structure forms a fluidic connection with the drive cylinder structure. The working fluid fills the stroke limit cylinder structure and the drive cylinder structure. The plurality of cams form mechanical linkages with the drive cylinder structure and the stroke limit cylinder structure. The working fluid and the plurality of cams limit the range of motion of the engine valve structure.

There is provided a variable valve timing system for an engine in which a cylinder head is fixed on a cylinder, and the cylinder head is suspended on a vehicle body frame, the variable valve timing system including: a variable valve device configured to change an opening and closing timing of a valve according to a hydraulic pressure; and an oil control valve. The vehicle body frame includes a main frame configured to laterally cover a rear side of the cylinder head and a down frame configured to laterally cover a front side of the cylinder head. In a side view of a vehicle, the oil control valve is detachably disposed on an outer surface of the engine below an area surrounded by the main frame, the down frame, and a lower surface of the cylinder head.

The application discloses an electro-hydraulic control variable valve timing and lift adjustment method and device, and belongs to the field of power machinery control. The application constructs a working mode suitable for the electro-hydraulic control variable valve timing and lift adjustment device, including a full lift mode, an early intake valve closing mode, a late intake valve opening mode and a multiple intake valve mode; the profile of a cam, the diameter of a driving receiving piston, the diameter of a high-pressure oil way and a solenoid valve are optimized; based on the working characteristics of a high-speed solenoid valve for controlling the on-off of an oil way, a solenoid valve current waveform and a power driving circuit are designed to realize the thermal protection and quick opening and closing of the solenoid valve; according to the requirements of different modes, corresponding control strategies are designed, a controller module judges the current cylinder number according to a camshaft signal and sends a control signal to a driving circuit according to a crankshaft signal to control the accurate opening and closing of the solenoid valve, so that the multi-mode adjustment of valve timing and lift is realized. The application has the advantages of high controllability and strong practicability and is suitable for the requirements of continuously adjusting the valve timing and lift of a high-power vehicle.

This invention discloses an unlocking control method for a center-lock variable valve timing system, comprising: S1: After obtaining an unlocking command and meeting the unlocking conditions, proceeding to S2; S2: Obtaining the current duty cycle, controlling the current duty cycle for time t1 in an open loop, and obtaining the current phase of the camshaft in real time. If the phase difference between the current phase and the initial phase is greater than or equal to a deviation threshold, unlocking is successful, and the current duty cycle is controlled in a closed loop to adjust the current phase to the target phase; otherwise, unlocking fails, proceeding to S3; S3: Adjusting the current duty cycle to the first duty cycle time t2; S4: Adjusting the current duty cycle for time t3 according to the oscillation-assisted unlocking rule, and obtaining the current phase in real time. If the phase difference is greater than or equal to the deviation threshold, unlocking is successful, and the current duty cycle is controlled in a closed loop to adjust the current phase to the target phase; otherwise, unlocking fails, and a fault code is reported. This method can shorten the unlocking time under normal conditions and reduce overshoot, thus reducing the phenomenon of failure to unlock.

If the intake valve closing timing during cranking is constant, it can easily lead to starting problems under low-temperature conditions, and conversely, knocking under high-temperature conditions. [Solution] The internal combustion engine is equipped with an electrically operated variable valve timing mechanism that changes the phase of the camshaft and the crankshaft that open and close the intake valves within a predetermined angular range. In its default state, the variable valve timing mechanism is set to a late closing setting where the intake valve closing timing IVC is relatively far behind bottom dead center BDC. During cranking, the target conversion angle of the variable valve timing mechanism is controlled according to the coolant temperature, such that the lower the coolant temperature, the closer the intake valve closing timing IVC is to bottom dead center BDC, increasing the amount of intake air in the cylinder.

The invention belongs to the technical field of variable valve timing systems of engines, and discloses an electromagnet structure of a variable valve timing system. The magnetic core body (12) is of a cylindrical structure, a plurality of concave blind grooves (121) are formed in the periphery of the magnetic core body (12) along the circumference according to gaps, a shaft hole (123) is formed in the end face of the magnetic core body (12), an oil passing groove (122) is formed in the shaft hole (123), a cavity is formed in one end of a front yoke sleeve (22) of the front yoke sleeve sub-assembly (2), an opening cavity (221) is formed in the cavity, a plurality of oil passing holes (223) are formed in the end face of the front yoke sleeve (22), and the opening cavity (221) is communicated with the oil passing holes (223). A limiting boss (222) and a bearing hole (224) are arranged on the end face of the front yoke sleeve (22) in the axial direction, and the periphery of a cavity of the front yoke sleeve (22) is a conical surface (225). According to the electromagnet structure of the variable valve timing system, the problem of motion clamping stagnation of the magnetic core body can be effectively solved through an electromagnet guide-sleeve-free structure, magnetic circuit gaps are reduced, and weakening of generated electromagnetic force is reduced.

A independent rotary valve engine and a method for controlling thereof includes an engine crankcase, a crankshaft located therein, a bidirectional servo motor connected to the engine crankcase, a cylinder block connected to the engine crankcase, and a cylinder head connected to the cylinder block, with a spark plug and a piston linked by a connecting rod to the crankshaft. An intake rotary valve is located within a first channel in the cylinder head, and an exhaust rotary valve is located within a parallel second channel. A pulley connects a servo motor shaft of the bidirectional servo motor to the intake rotary valve. An engine control device, operatively connected to the spark plug and the bidirectional servo motor, generates spark timing signals, receives an engine speed requirement, determines a wide-open throttle position and intake valve closing angle, and generates variable valve timing signals to rotate the servo motor shaft.

The invention provides an engine air management system, a control method and a vehicle, the engine air management system comprises: an engine having a first cylinder group and a second cylinder group, the first cylinder group comprising a plurality of first cylinders, and the second cylinder group comprising a plurality of second cylinders; the asymmetric supercharger comprises a first flow channel and a second flow channel, the sectional area of the first flow channel is smaller than that of the second flow channel, the asymmetric supercharger comprises a turbine flow channel, and exhaust channels of the first air cylinders and exhaust channels of the second air cylinders communicate with the turbine flow channel. The exhaust passage of each first cylinder is communicated with the inlet end of the first flow passage, the exhaust passage of each second cylinder is communicated with the inlet end of the second flow passage, and the inlet end of the first flow passage and the inlet end of the second flow passage are communicated with the exhaust manifold; and the variable valve timing mechanism is connected with each intake valve of the engine. The problem that the consistency of all cylinders becomes poor due to the fact that an asymmetric supercharger is used in an engine is solved.

Method for diagnosing an engine system comprising an opening duration device (80) for a variable valve (CVVD) and an exhaust gas recirculation (EGR) device, the method comprising: Acquisition of data by a data acquisition device (90) for diagnosing the engine system; Based on the collected data, determine by a controller (100) whether a fuel cut-off condition is met; Actuation of an EGR valve (73) by the control unit (100) such that an opening value of the EGR valve (73) becomes a first opening value when the fuel cut-off condition is met; Determine by the control unit (100) whether the amount of the increase in intake pressure due to actuation of the EGR valve (73) is within a first predetermined range; Actuation of the CVVD device (80) by the control unit (100) such that an opening duration of an intake valve (14) becomes a first target duration when the amount of increase in intake pressure by actuation of the EGR valve (73) is in the first predetermined range; Determine by the control unit (100) whether a reduced amount of the intake pressure is within a second predetermined range by actuating the CVVD device (80); and Determine by the control unit (100) that the CVVD device (80) is in a fault condition when the reduced amount of the intake pressure by actuating the CVVD device (80) is outside the second predetermined range; Maintaining the opening amount of the EGR valve (73) at the first target opening amount and the opening duration of the intake valve (14) at the first target duration by the control unit (100) for a predetermined period when the reduced amount of the intake pressure is in the second predetermined range by actuation of the CVVD device (80); Monitoring the intake pressure by the controller (100) at a time when the predetermined period has elapsed; and Determine by the controller (100) whether the intake pressure is within a third predetermined range at the time when the predetermined period has elapsed.

The invention provides an engine control method and device, electronic equipment, a computer readable storage medium and a computer program product. The method comprises the steps that under the condition that an exhaust gas recirculation (EGR) system is enabled, a first EGR rate corresponding to first environment data and a second EGR rate corresponding to second environment data are determined; determining a first variable valve timing (VVT) opening degree corresponding to the first EGR rate; and based on the variable quantity between the first EGR rate and the second EGR rate, the first VVT opening degree is adjusted, and the second VVT opening degree corresponding to the second environment data is determined. Through the application, the fuel consumption rate can be reduced, and the engine performance can be improved.

A method for controlling a spark-ignited internal combustion engine (10) of a motor vehicle, provided with a variable valve timing system (50, 52) and a system (40) for purifying contaminants, the system (40) comprising at least one three-way catalyst (42a), the method comprising the following consecutive steps: cutting off the fuel injection when a foot lift phase is detected, and a subsequent step of maintaining the cutting until the injection is resumed; overlapping the intake valve (51) and the exhaust valve (53); -performing a de-overlap of the intake valve (51) and the exhaust valve (53) when a non-zero torque request, or a predetermined re-injection speed, or an engine disengagement is detected; and resuming the injection.

The invention provides an engine rapid cold starting method which comprises the steps of collecting air inlet temperature data of an engine, determining a current starting control strategy according to a pre-calibrated cold starting strategy, controlling and executing engine operation dragging duration according to the current starting control strategy, and controlling an oil sprayer, a spark plug and a variable valve mechanism to act. Further, the residence time of the mixed gas of the fuel oil and the air in the cylinder is controlled; and collecting exhaust temperature data of the engine, and controlling an engine starting device, an oil sprayer, a spark plug and a variable valve mechanism to execute an idle speed control strategy when determining that the thermodynamic state in the cylinder at present meets a stable combustion condition according to the stored calibration data. When the piston engine is started in the extremely cold environment, the time of fuel oil mixed gas staying in the cylinder can be controlled according to the cold environment temperature condition, it is guaranteed that fuel oil is fully combusted to release heat, the combustion chamber is heated, the stable combustion condition is rapidly achieved, and rapid cold starting is achieved.

The invention relates to an intelligent control tail gas catalytic reduction pneumatic-internal combustion two-stroke hybrid power liquid oxygen internal combustion engine. Comprising an intelligent control system, a first hydrocarbon fuel nozzle, a second hydrocarbon fuel nozzle, a first liquid oxygen nozzle, a second liquid oxygen nozzle, an oxygen nozzle, a low-temperature gas nozzle, a variable valve timing system, a compressor, a controllable gas diverter valve and multiple sets of sensors. The intelligent control system carries out intelligent and accurate comparative analysis calculation and determines the optimal fuel injection amount of the hydrocarbon fuel nozzle according to the temperature, the pressure and the flow of the tail gas collected by the sensor and the molar mass content of gases such as carbon dioxide, water vapor, hydrogen, carbon monoxide, oxygen and HC in the tail gas, so that the optimal regeneration rate of the regenerated fuel can be realized; the high-temperature tail gas intercepted in the air cylinder is adjusted through the intelligent control variable valve timing system, the first liquid oxygen nozzle is controlled through the intelligent control unit to spray the optimal liquid oxygen mass for pneumatic two-stroke, tail gas waste heat can be utilized to the maximum extent, the available cold energy of the liquid oxygen can be improved, the optimal pneumatic acting efficiency is achieved, and the working efficiency is improved. Therefore, the fuel consumption is greatly reduced; expansion energy of liquid oxygen or liquid oxygen and LNG gasification can improve the torque of the internal combustion engine; the outlet pressure of the compressor is intelligently controlled, so that the liquefaction of carbon dioxide can be optimized, and the cold energy consumption of liquid oxygen is reduced; the controllable gas diverter valve is intelligently controlled, and the flow of low-temperature gas entering the gas sleeve of the internal combustion engine can be intelligently adjusted, so that the internal combustion engine is kept in a proper working temperature range.

This application relates to a variable valve timing control system and its control method, device, and equipment, belonging to the field of engine testing technology. The system includes: an engine electronic control unit (ECU), used to receive crankshaft position sensor signals and camshaft position sensor signals from 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 a preset target valve timing; the oil control valve control signal is used to control the oil control valve to adjust the actual valve timing to the preset target valve timing; and a data conversion module, connected to the ECU, used to receive crankshaft position sensor signals, camshaft position sensor signals, engine motor feedback signals, and oil control valve control signals in real time, generate a motor drive signal, and transmit the motor drive signal to the motor. Using this system can reduce testing complexity.

In a series hybrid vehicle, when the battery is nearly fully charged, the system operates without generating electricity, allowing the internal combustion engine to operate as a heat source. [Solution] In a series hybrid vehicle, the internal combustion engine that drives the power generation motor generator is equipped with a hydraulically variable oil pump. Under conditions where combustion operation of the internal combustion engine as a heat source is required, and power generation is not required, the engine operates autonomously by limiting the intake air volume and retarding the ignition timing, while the shaft torque supplied to the power generation motor generator is set to 0 for non-power generation operation (Region A). At this time, the target hydraulic pressure of the hydraulically variable oil pump is set to the maximum hydraulic pressure, the output consumed by driving the oil pump is increased, and the valve overlap is increased by the variable valve timing mechanism to suppress the amount of fresh air.

Method for confirming a valve phase during the starting of an internal combustion engine, wherein the method confirms a valve phase during the starting of an internal combustion engine having a variable valve timing system configured to adjust the valve phase of the internal combustion engine, wherein the method includes: Shifting the valve phase to a most delayed position by the variable valve timing system when starting the internal combustion engine; successively determining whether a valve phase deviation, i.e. a difference between output values ​​of a cam angle sensor at a consecutive time, is below a specified reference deviation; Confirming the valve phase, that the valve phase has reached the most delayed position, in the case where the valve phase deviation is below the reference deviation; Using the valve phase for starting control of the internal combustion engine; wherein the system is configured with variable valve timing to allow adjustment of the valve phase by electrical actuation, and is used to adjust an inlet valve phase; further showing the procedure: Terminating a series of processing to confirm the valve phase in the case where the valve phase is not confirmed at a time when a cylinder determination is completed during the processing for cylinder determination, which is performed separately.

The invention provides a testing method, device and equipment, a storage medium and a program product, and relates to the technical field of vehicle testing. The method comprises the steps that control calibration parameters related to variable valve timing operation are input into a vehicle control system, and the control calibration parameters are used for triggering an operation clamping stagnation fault of variable valve timing; according to the control calibration parameters, control parameters of variable valve timing in the vehicle control system are updated, and the control parameters comprise a time constant of an exhaust cam shaft phase control low-pass filter, an error simulation characteristic line of an exhaust cam phaser and an enabling value of an exhaust cam shaft adjusting speed filter; and the response state of the vehicle control system to the operation clamping stagnation fault of variable valve timing is obtained, wherein the response state comprises a fault code response state and an indicator lamp response state. According to the test method, the test efficiency is improved.