Range extender-oriented variable valve timing and lift electric valve and control method

Abstract

The invention discloses a range extender-oriented variable valve timing and lift electric valve and a control method, and belongs to the technical field of valve mechanisms, the range extender-oriented variable valve timing and lift electric valve comprises a cylinder cover, a hydraulic tappet, a valve seat, a valve spring, a valve, a motor support frame and a controllable servo motor, the valve is slidably mounted in a valve pipeline of the cylinder cover, and the lower end of the valve is located in an air cavity; the upper end of the air valve is located in the control cavity, the upper end of the air valve is connected with the air valve seat, the outer side of the air valve is sleeved with the air valve spring, the air valve spring is arranged between the lower end of the air valve seat and the bottom of the control cavity, and the upper end of the air valve seat is connected with the hydraulic tappet. The output end of the controllable servo motor is in butt joint with the hydraulic tappet, the controllable servo motor is controlled to extrude the hydraulic tappet and drive the valve to move downwards or controlled to relieve extrusion, and the valve spring drives the valve to reset. Through the arrangement of the electric valve and the cooperation of the control method, the operating heat efficiency of the range extender can be kept in an expected state.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile valve mechanisms, and in particular to an electric valve with variable valve timing phase and lift for a range extender and a control method thereof. Background Art

[0002] In recent years, extended-range hybrid (RRH) technology has rapidly developed as a fusion of pure electric power and low-carbon fuel efficiency. Its characteristics include: 1. Drive mode: The vehicle is primarily driven by the electric motor; the internal combustion engine does not directly participate in the drive, but instead acts as a generator to provide electricity; 2. Simplified structure: Compared with series-parallel hybrid systems, the power path is clearer, and the internal combustion engine does not need to adapt to complex driving conditions; 3. Efficient operation: The internal combustion engine typically operates in the high-efficiency range, with higher thermal efficiency and lower emissions; 4. Smaller battery capacity: Compared with pure electric vehicles, the battery capacity can be designed to be smaller, and the internal combustion engine can be used to recharge to extend the driving range; 5. Alleviation of range anxiety: Through refueling, it has a long driving range comparable to traditional fuel vehicles, combining the advantages of new energy vehicles.

[0003] At the same time, its development has been good in recent years: 1. Mainstream automakers have made large-scale layouts: such as launching extended-range models, or announcing that they will launch multiple extended-range new energy vehicles; 2. Significant sales growth: In recent years, the proportion of extended-range models in China's new energy vehicle sales has increased rapidly; 3. Driven by technological innovation: New energy vehicle range extenders have evolved from traditional small-displacement gasoline engines to high-efficiency models with high compression ratios, Atkinson cycle, miniaturization, and high thermal efficiency.

[0004] As a core system in extended-range hybrid vehicles, the range extender does not directly drive the vehicle; its purpose is to generate electricity. Therefore, its operating method differs from that of a traditional engine. Instead of requiring frequent speed changes, it must consistently operate near a specific high-efficiency point to achieve better fuel economy. The ability of the range extender to maintain its desired thermal efficiency is influenced by its valvetrain. Conventional fixed valvetrains are unable to effectively maintain this desired thermal efficiency.

[0005] Therefore, there is an urgent need for an electric valve and control method with variable valve timing phase and lift for range extenders to solve the problem that conventional fixed valve mechanisms cannot effectively keep the thermal efficiency of range extenders at the expected state. Summary of the Invention

[0006] In response to the deficiencies in the prior art, the present invention provides an electric valve with variable valve timing phase and lift and a control method for a range extender, so as to solve the problem that conventional fixed valve mechanisms cannot effectively maintain the thermal efficiency of the range extender at the expected state.

[0007] To achieve the above object, the present invention adopts the following technical solutions: The camshaft is connected to the air intake valve seat of the cylinder head, and the camshaft is connected to the air intake valve seat of the cylinder head by a spring. The camshaft is connected to the air intake valve seat of the cylinder head, and the camshaft is connected to the air intake valve seat of the cylinder head.

[0008] To optimize the above technical solutions, specific measures taken also include: Furthermore, the motor support frame includes four support columns and a mounting frame, the middle of the mounting frame is a hollow mounting cavity, the controllable servo motor is detachably mounted in the mounting cavity, and the outer side of the mounting frame is fixedly mounted at the upper end opening of the control cavity in the cylinder head through four support columns arranged in a rectangular array.

[0009] Furthermore, it also includes a fixing pin, a locking hole is opened on each side of the mounting cavity on the mounting frame, and recessed holes are correspondingly provided on both sides of the controllable servo motor. The fixing pin is used to pass through the locking hole of the mounting frame and be correspondingly engaged in the recessed hole of the controllable servo motor.

[0010] Furthermore, an output end of the controllable servo motor is fixedly connected to an actuator block, and the actuator block is used to connect to the hydraulic tappet.

[0011] Furthermore, the controllable servo motor is provided with a micro motor controller, and the micro motor controller is used to receive signals and control the movement of the controllable servo motor.

[0012] Furthermore, a control method includes the following steps: The range extender is provided with a range extender speed sensor for real-time monitoring of the range extender speed change. Each controllable servo motor is provided with a micro motor controller for receiving signals and controlling the movement of the controllable servo motor. The range extender speed sensor and the micro motor controller are electrically connected to the vehicle electronic control unit ECU respectively. The vehicle electronic control unit ECU receives the speed signal from the range extender speed sensor and adjusts the speed according to the preset speed-intake delay angle. The speed-valve lift table and the speed-valve lift table are used to determine the optimal intake delay angle of the current range extender. And the best valve lift, then according to the corresponding best intake delay angle A control signal for controlling the moving speed of the controllable servo motor output end is sent, and a control signal for controlling the moving stroke of the controllable servo motor output end is sent to all micro motor controllers according to the corresponding optimal valve lift. The micro motor controller controls the controllable servo motor to move to complete the control of the valve.

[0013] Furthermore, the speed-intake delay angle The process of making a table includes the following steps: For different range extenders, r / min is the step length, and the corresponding range extender is measured from idle speed to maximum speed through bench test. The optimal intake delay angle corresponding to the maximum value of , the measured optimal intake retardation angle As the intake retardation angle of the range extender within this step The preset control amount and the speed data in each step and the corresponding optimal intake delay angle The data is made into speed-intake delay angle Table, in which is the effective intake volume coefficient, is the cylinder pressure.

[0014] Furthermore, the process of making the speed-valve lift table includes the following steps: For different range extenders, r / min is the step length, and the corresponding range extender is measured from idle speed to maximum speed through bench test, and the intake efficiency is The optimal valve lift at the highest speed is used as the preset valve lift control amount of the range extender in this speed range, and the speed data in each step and the corresponding optimal valve lift data are made into a speed-valve lift table.

[0015] The beneficial effects of the present invention are: The electric valve structure of the present invention is simple. By connecting the output end of a controllable servo motor to a hydraulic tappet, the hydraulic tappet is vertically squeezed as needed, driving the valve downward or releasing the hydraulic tappet's squeeze in a controlled manner. The valve spring then resets the valve, facilitating valve control and maintaining the range extender's thermal efficiency at the desired optimal state. The device of the present invention offers the advantages of a compact structure, fast response speed, high control accuracy, and ease of integration and expansion. Furthermore, the electric valve structure of the present invention facilitates coordination with control methods for range extender characteristics. It can quickly respond to transient changes in power generation demand, precisely adjusting valve opening and closing time and lift to achieve a more stable power output.

[0016] This invention introduces an electric valvetrain structure with variable valve timing (VVT) and variable valve lift (VVL), which offers the following advantages for range extenders: 1. Improved fuel economy: The valvetrain adaptively adjusts valve characteristics under varying power generation loads and ambient temperatures, consistently maintaining the range extender operating at the desired optimal thermal efficiency point. 2. Improved NVH performance: The valvetrain eliminates the mechanical and hydraulic components, including the camshaft and cam transmission mechanism, simplifying the entire intake system and reducing additional friction. This improves the overall NVH performance of the vehicle and the fuel economy of the range extender system, while also avoiding the power loss associated with traditional crankshaft-driven camshafts. 3. Improved system response speed and control accuracy: The valvetrain rapidly responds to transient changes in power generation demand, precisely adjusting valve opening and closing timing and lift to achieve a more stable power output. 4. Facilitates modularization and electronic control integration: The electric valvetrain easily integrates with the electronic control system, adapting to future intelligent connected architectures and supporting over-the-air updates and the deployment of intelligent control methods. This is for variable valve timing, variable valve lift, and camshaft replacement.

[0017] The control method of the present invention takes the optimal filling coefficient as the goal, and adjusts the valve parameters in real time by communicating with the vehicle electronic control unit ECU, dynamically optimizes the combustion state, and controls the optimal intake delay angle. and optimal valve lift, ensuring that the range extender system achieves excellent energy consumption performance and charging efficiency, improving the overall thermal efficiency inside the range extender, and reducing hydrocarbon emissions and fuel consumption.

[0018] The present invention is applicable to a range-extended new energy vehicle platform with compact space and high efficiency as its core requirement. The control method of the present invention can be adaptively adjusted in combination with the current operating conditions of the range extender, such as load, speed, cold start, etc., to ensure that the range extender's filling coefficient is optimal. Its feature of adaptively adjusting valve characteristics always keeps the range extender operating at a good thermal efficiency point, which can not only improve fuel economy and NVH performance, but also help reduce emissions and extend system life. It is particularly suitable for range-extended system architectures that pursue high efficiency and modular design. The valve mechanism system of traditional range extenders cannot adaptively adjust valve characteristics such as valve timing and valve lift, or the adjustment range is small and cannot cover the entire speed range, resulting in poor performance of its filling coefficient, and ultimately leading to low overall thermal efficiency of the range extender. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the electric valve with variable valve timing and lift for the range extender proposed by the present invention; Figure 2 This is a schematic structural diagram of the motor support frame of the electric valve with variable valve timing and lift for the range extender proposed by the present invention; Figure 3 This is a flow chart of the control method proposed in the present invention.

[0020] Figure numerals: 1. valve, 2. cylinder head, 3. valve guide, 4. valve spring, 5. valve seat, 6. hydraulic lifter, 7. motor support frame, 8. controllable servo motor, 9. actuator. DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] As attached Figure 1 As shown, an electric valve with variable valve timing and lift for a range extender according to an embodiment of the present invention includes a cylinder head 2, a hydraulic lifter 6, a valve seat 5, a valve spring 4, a valve 1, a motor support frame 7 and a controllable servo motor 8. The valve 1 is slidably installed in the valve pipe 3 of the cylinder head 2, the lower end of the valve 1 is located in the air cavity below the valve pipe 3, and the upper end is located in the control cavity above the valve pipe 3. The upper end of the valve 1 is connected to the valve seat 5, and a valve spring 4 is sleeved on the outer side of the valve 1. The valve spring 4 is arranged between the lower end of the valve seat 5 and the bottom of the control cavity. The upper end of the valve seat 5 is connected to the hydraulic lifter 6, the motor support frame 7 is fixedly installed at the upper end opening of the control cavity, the controllable servo motor 8 is installed on the motor support frame 7, and the output end of the controllable servo motor 8 is connected to the hydraulic lifter 6. The controllable servo motor 8 is used to controllably squeeze the hydraulic lifter 6 vertically and drive the valve 1 to move downward, or to controllably release the squeezing of the hydraulic lifter 6, and the valve spring 4 drives the valve 1 to reset.

[0023] The electric valve of the present invention has a simple structure. By connecting the output end of the controllable servo motor 8 to the hydraulic lifter 6, the hydraulic lifter 6 is vertically squeezed as needed, driving the valve 1 downward, or the hydraulic lifter 6 is controlled to be released. The valve spring 4 drives the valve 1 to reset, facilitating control of the valve 1, so that the thermal efficiency of the range extender is maintained at the expected optimal state. The device of the present invention has the advantages of compact structure, fast response speed, high control accuracy, and easy integration and expansion. In addition, with respect to the characteristics of the range extender, the electric valve structure of the present invention is easy to cooperate with the control method. When the power generation demand changes instantaneously, it can quickly respond and accurately adjust the opening and closing time and lift of the valve 1 to achieve a more stable power output.

[0024] As attached Figure 2 As shown, in a further embodiment based on the above, the motor support frame 7 comprises four support columns and a mounting frame. The center of the mounting frame defines a hollow mounting cavity, into which the controllable servo motor 8 is removably mounted. The outer side of the mounting frame is fixed to the upper opening of the control cavity in the cylinder head 2 via four support columns arranged in a rectangular array. In this embodiment, the motor support frame 7 can be fixed to the upper opening of the control cavity in the cylinder head 2 by welding or other means. This achieves a streamlined structure while ensuring structural stability.

[0025] The mounting frame further includes a fixing pin, with a locking hole symmetrically formed on each side of the mounting cavity. There are corresponding recessed holes on both sides of the controllable servo motor 8. The fixing pin is used to pass through the locking holes of the mounting frame and engage in the corresponding recessed holes of the controllable servo motor 8. This facilitates the assembly and disassembly of the controllable servo motor 8. When connecting the controllable servo motor 8 to the motor support frame 7, it is necessary to align the locking holes on the left and right sides of the motor support frame 7 with the recessed holes on the left and right sides of the controllable servo motor 8, and then insert the fixing pins through the locking holes on the left and right sides of the motor support frame 7 until they engage in the recessed holes to complete the fixing of the controllable servo motor 8.

[0026] In a further embodiment based on the above, the output end of the controllable servo motor 8 is fixedly connected to an actuator block 9, which is used to connect to the hydraulic tappet 6. In this way, the actuator block 9 increases the stability of the transmission and facilitates the disassembly and assembly of the actuator block 9 for maintenance.

[0027] In a further embodiment based on the above, the controllable servo motor 8 is provided with a micro motor controller, which is used to receive signals and control the movement of the controllable servo motor 8. In this way, the controllable servo motor 8 is easily controlled.

[0028] Compared to traditional fixed valvetrains, this invention introduces an electric valvetrain structure with variable valve timing (VVT) and variable valve lift (VVL), offering the following advantages for range extenders: 1. Improved fuel economy: The valvetrain characteristics are adaptively adjusted under varying power generation loads and ambient temperatures, consistently maintaining the range extender operating at its optimal thermal efficiency point. 2. Improved NVH performance: This valvetrain eliminates mechanical and hydraulic components such as the camshaft and cam transmission, simplifying the entire intake system and reducing additional friction. This improves the overall NVH performance of the vehicle and the fuel economy of the range extender system, while also avoiding the power loss associated with traditional crankshaft-driven camshafts. 3. Improved system response speed and control accuracy: The system can rapidly respond to transient changes in power generation demand, precisely adjusting the opening and closing time and lift of valve 1 to achieve a more stable power output. 4. Facilitated modularization and electronic control integration: The electric valvetrain easily integrates with the electronic control system, adapting to future intelligent connected architectures and supporting over-the-air updates and the deployment of intelligent control methods. For variable valve timing, variable valve lift and camshaft replacement.

[0029] As attached Figure 3 As shown, in another embodiment of the present invention, a control method is provided for the above-mentioned electric valve with variable valve timing and lift for the range extender, comprising the following steps: The range extender is provided with a range extender speed sensor for real-time monitoring of the range extender speed change, each controllable servo motor 8 is provided with a micro motor controller for receiving signals and controlling the movement of the controllable servo motor 8, the range extender speed sensor and the micro motor controller are respectively electrically connected to the vehicle electronic control unit ECU, the vehicle electronic control unit ECU receives the signal of the range extender speed sensor and adjusts the speed according to the preset speed-intake delay angle. The speed-valve lift table and the speed-valve lift table are used to determine the optimal intake delay angle of the current range extender. And the best valve lift, then according to the corresponding best intake delay angle A control signal for controlling the moving speed of the output end of the controllable servo motor 8 is sent, and a control signal for controlling the moving stroke of the output end of the controllable servo motor 8 is sent to all micro-motor controllers according to the corresponding optimal valve lift. The micro-motor controller controls the controllable servo motor 8 to move, so as to complete the control of the valve 1, and thereby achieve the optimal filling coefficient control. In this solution, the movement of the controllable servo motor 8 can reach the hydraulic tappet 6 through the above-mentioned actuator block 9, thereby controllably pressing down the valve 1, and realizing the functions of variable valve timing and variable valve lift. In this solution, the micro-motor controller controls the movement and speed of the controllable servo motor 8, thereby equivalently controlling the valve phase angle and valve lift. In this solution, through the optimal intake late closing angle It can obtain the best valve timing.

[0030] Among them, the above speed-intake delay angle The process of making a table includes the following steps: For different range extenders, r / min is the step length, x can be 200, and the corresponding range extender is measured from idle speed to maximum speed through bench test. The optimal intake delay angle corresponding to the maximum value of , the measured optimal intake retardation angle As the intake retardation angle of the range extender within this step The preset control amount and the speed data in each step and the corresponding optimal intake delay angle The data is made into speed-intake delay angle Table, in which is the effective intake volume coefficient, is the cylinder pressure.

[0031] Among them, the effective intake volume coefficient The cylinder pressure is obtained by dividing the actual intake volume value obtained by the intake volume sensor with the theoretical intake volume. It is measured by a cylinder pressure sensor, which is a conventional technical means.

[0032] In this scheme, in order to ensure the optimal filling coefficient, the filling coefficient Starting from the analytical expression:

[0033] Where, is the effective intake volume coefficient, is the compression ratio, is the atmospheric temperature, is atmospheric pressure, is the cylinder pressure, is the cylinder temperature, is the residual exhaust gas coefficient. The specific analysis is as follows: Intake retardation angle :This angle has the greatest impact on the filling coefficient among the four independent valve timing phases, so it is the most important object of design attention. , effective intake volume coefficient , from the analytical expression, it will make The intake lag angle The range extender may also make better use of the airflow inertia to take in more air, making So the two are in a contradictory relationship, the solution is to find The optimal intake delay angle corresponding to the maximum value , therefore, according to each step The optimal intake delay angle corresponding to the maximum value of , pre-set speed-intake delay angle Table for control use.

[0034] Intake retardation angle The relationship between the adjustment and the range extender speed is as follows: When the range extender is at a low speed, the piston moves downward during the intake stroke to inhale fresh working fluid, and then enters the compression stroke and the piston moves upward. At this time, if the intake valve closes too late, the fresh working fluid just inhaled will be pushed out of the intake valve by the piston, resulting in "intake backflow" phenomenon, which makes the When the range extender speed is high, the air flow speed is high. At this time, if the intake closing angle is delayed If it is too small, it will not be possible to use the inertia of the airflow to take in more air to offset it. The negative impact on the filling coefficient.

[0035] The process of making the above-mentioned speed-valve lift table includes the following steps: For different range extenders, r / min is the step length, y can be taken as 200, and the corresponding range extender is measured from idle speed to maximum speed through bench test, and the intake efficiency is made in each step length. The optimal valve lift at the highest speed is used as the preset valve lift control amount of the range extender in this speed range, and the speed data in each step and the corresponding optimal valve lift data are made into a speed-valve lift table.

[0036] in, It is monitored and calculated through sensors such as intake volume sensor, atmospheric temperature sensor, atmospheric pressure sensor, cylinder pressure sensor, cylinder temperature sensor and exhaust volume sensor. This part belongs to conventional technical means.

[0037] The present invention can be preset and customized according to the structure and purpose of the range extender. In the above solution, the range extender speed sensor can be selected as QBJ-CS-2-2, the micro motor controller can be selected as SV-X2EA075A-A, and the servo motor can be selected as SV-X2MH075A-B2LN.

[0038] The control method of the present invention takes the optimal filling coefficient as the goal, and adjusts the valve parameters in real time by communicating with the vehicle electronic control unit ECU, dynamically optimizes the combustion state, and controls the optimal intake delay angle. and optimal valve lift, ensuring that the range extender system achieves excellent energy consumption performance and charging efficiency, improving the overall thermal efficiency inside the range extender, and reducing hydrocarbon emissions and fuel consumption.

[0039] The present invention is applicable to a range-extended new energy vehicle platform with compact space and high efficiency as its core requirement. The control method of the present invention can be adaptively adjusted in combination with the current operating conditions of the range extender, such as load, speed, cold start, etc., to ensure that the range extender's filling coefficient is optimal. Its feature of adaptively adjusting valve characteristics always keeps the range extender operating at a good thermal efficiency point, which can not only improve fuel economy and NVH performance, but also help reduce emissions and extend system life. It is particularly suitable for range-extended system architectures that pursue high efficiency and modular design. The valve mechanism system of traditional range extenders cannot adaptively adjust valve characteristics such as valve timing and valve lift, or the adjustment range is small and cannot cover the entire speed range, resulting in poor performance of its filling coefficient, and ultimately leading to low overall thermal efficiency of the range extender.

[0040] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. cited in the invention are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0041] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of protection of the present invention are within the scope of protection of the present invention. It should be pointed out that for those skilled in the art, it is understood that various changes, modifications, substitutions, embellishments and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and they should be regarded as the scope of protection of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric valve with variable valve timing and lift for a range extender, characterized by: The invention comprises a cylinder head (2), a hydraulic tappet (6), a valve seat (5), a valve spring (4), a valve (1), a motor support frame (7) and a controllable servo motor (8), wherein the valve (1) is slidably mounted in a valve pipe (3) of the cylinder head (2), the lower end of the valve (1) is located in an air cavity below the valve pipe (3), and the upper end is located in a control cavity above the valve pipe (3), the upper end of the valve (1) is connected to the valve seat (5), and a valve spring (4) is provided on the outer side of the valve (1), and the valve spring (4) is arranged on the valve Between the lower end of the seat (5) and the bottom of the control chamber, the upper end of the valve seat (5) is connected to the hydraulic tappet (6), the motor support frame (7) is fixedly installed at the upper end opening of the control chamber, the controllable servo motor (8) is installed on the motor support frame (7), and the output end of the controllable servo motor (8) is connected to the hydraulic tappet (6), and the controllable servo motor (8) is used to controllably squeeze the hydraulic tappet (6) vertically and drive the valve (1) to move downward, or to controllably release the squeezing of the hydraulic tappet (6), and the valve spring (4) drives the valve (1) to reset.

2. The electric valve with variable valve timing and lift for a range extender according to claim 1, characterized in that: The motor support frame (7) includes four support columns and a mounting frame. The center of the mounting frame is a hollow mounting cavity. The controllable servo motor (8) is detachably mounted in the mounting cavity. The outer side of the mounting frame is fixedly mounted on the upper end opening of the control cavity in the cylinder head (2) through four support columns arranged in a rectangular array.

3. The electric valve with variable valve timing and lift for a range extender according to claim 2, characterized in that: It also includes a fixing pin, a locking hole is provided on each side of the mounting frame and located on both sides of the mounting cavity, and recessed holes are provided on both sides of the controllable servo motor (8), and the fixing pin is used to pass through the locking hole of the mounting frame and be correspondingly engaged in the recessed hole of the controllable servo motor (8).

4. The electric valve with variable valve timing and lift for a range extender according to claim 1, characterized in that: An output end of the controllable servo motor (8) is fixedly connected to an actuator block (9), and the actuator block (9) is used to connect to the hydraulic strut (6).

5. The electric valve with variable valve timing and lift for a range extender according to claim 1, characterized in that: The controllable servo motor (8) is provided with a micro motor controller, and the micro motor controller is used to receive signals and control the movement of the controllable servo motor (8).

6. A control method is applied to the electric valve with variable valve timing and lift for range extender according to any one of claims 1 to 5, characterized in that: The steps include: The range extender is provided with a range extender speed sensor for real-time monitoring of the range extender speed change, each controllable servo motor (8) is provided with a micro motor controller for receiving signals and controlling the movement of the controllable servo motor (8), the range extender speed sensor and the micro motor controller are respectively electrically connected to the vehicle electronic control unit ECU, the vehicle electronic control unit ECU receives the speed signal sent by the range extender speed sensor, and adjusts the speed according to the preset speed-intake delay angle. The speed-valve lift table and the speed-valve lift table are used to determine the optimal intake delay angle of the current range extender. And the best valve lift, then according to the corresponding best intake delay angle A control signal for controlling the moving speed of the output end of the controllable servo motor (8) is sent, and a control signal for controlling the moving stroke of the output end of the controllable servo motor (8) is sent to all micro motor controllers according to the corresponding optimal valve lift. The micro motor controller controls the controllable servo motor (8) to move, thereby completing the control of the valve (1).

7. A control method according to claim 6, characterized in that: The speed-intake delay angle The process of making a table includes the following steps: For different range extenders, r / min is the step length, and the corresponding range extender is measured from idle speed to maximum speed through bench test. The optimal intake delay angle corresponding to the maximum value of , the measured optimal intake retardation angle As the intake retardation angle of the range extender within this step The preset control amount and the speed data in each step and the corresponding optimal intake delay angle The data is made into speed-intake delay angle Table, in which is the effective intake volume coefficient, is the cylinder pressure.

8. A control method according to claim 6, characterized in that: The process of making the speed-valve lift table includes the following steps: For different range extenders, r / min is the step length, and the corresponding range extender is measured from idle speed to maximum speed through bench test, and the intake efficiency is The optimal valve lift at the highest speed is used as the preset valve lift control amount of the range extender in this speed range, and the speed data in each step and the corresponding optimal valve lift data are made into a speed-valve lift table.

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