12 results about "Valve lift" patented technology

A spool valve assembly operable for automatic control of oil flow includes: a housing; a spool valve configured to slide axially within the housing; a first inlet port on the housing configured to connect to a first oil passage, wherein the first oil passage is operable as an outlet of a first oil control valve; a second inlet port on the housing configured to connect to a second oil passage, wherein the second oil passage is operable as an outlet of a second oil control valve; a valve core outlet on the housing configured to connect to a third oil passage; and a return spring configured to return the spool valve to a rest position.

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.

This invention relates to an engine, an engine control system, and a vehicle. The engine includes: a hydraulic drive assembly with an inlet and an outlet, the inlet receiving a drive medium from the engine's main oil passage, the hydraulic drive assembly compressing the drive medium, and the outlet outputting the compressed drive medium; and a valve drive assembly with an inlet connected to the outlet to receive the compressed drive medium, the valve drive assembly driving the valve assembly to move under the action of the compressed drive medium. The engine provided in this application controls valve lift by controlling the pressure of the drive medium, achieving flexible and controllable valve movement, resulting in higher braking efficiency and braking power.

This invention discloses an intake and exhaust control mechanism and a four-stroke high-power valve incorporating the mechanism, including a valve, a rocker arm for driving valve opening and closing, a cam, and a transmission assembly connecting the cam and the rocker arm; it also includes a lift adjustment assembly and a buffer assembly; the transmission assembly includes an axially extendable tappet, the bottom end of which rolls in contact with the cam, and the top end of which abuts against one end of the rocker arm; this invention belongs to the technical field of internal combustion engine valve train mechanisms, and its purpose is to solve the problems of fixed or discontinuous lift adjustment, large impact under high load, and mismatched buffer characteristics in existing valve mechanisms. The technical effect achieved is: by driving the tappet to extend and retract through a threaded adjusting pair and a bevel gear transmission pair, stepless adjustment of valve lift is realized, which reduces the lift and enhances swirl under low load, and increases the lift and improves charging efficiency under high load, while the thread self-locking ensures stable adjustment and optimizes intake and exhaust performance under all operating conditions.

The application discloses a kind of electro-hydraulic variable valve opening duration continuous variable closed-loop control methods, belong to valve opening state identification technical field, comprising: the laser displacement sensor for detecting valve lift signal is installed in the lift end of electro-hydraulic variable valve, the calibration of opening time and closing time is carried out to each state valve data collected in Matlab, valve opening identification algorithm and valve closing identification algorithm used in Matlab offline test are written into ECU to carry out multiple-cycle open-loop test;With the identification valve opening duration as closed-loop feedback input, PID closed-loop controller is used to control valve to track target and realize the closed-loop switching of variable duration.The application can reduce the steady-state error of valve opening duration and realize continuous variable of arbitrary duration by taking the identification valve opening duration as feedback closed-loop control high-frequency solenoid valve high-frequency signal under the multiple-cycle operation of valve.

The application belongs to the technical field of automobile control, and particularly relates to a valve lift switching control method and device, a terminal and a medium. The valve lift switching control method comprises the following steps: acquiring an advance energization angle, wherein the advance energization angle is a first preset angle determined according to the response time of an electromagnetic valve; if the advance energization angle is less than an energization angle threshold, sending a pin extension instruction to the electromagnetic valve when the crank angle of the engine reaches the advance energization angle, wherein the pin extension instruction is used to instruct the electromagnetic valve to extend a pin, so that the pin cooperates with a valve switching drive device to realize valve lift switching. The application sends the pin extension instruction to the electromagnetic valve when the crank angle of the engine reaches the advance energization angle, which can control the electromagnetic valve to extend the pin for valve lift switching earlier, and does not need to compensate for the response delay characteristics of the electromagnetic valve by reducing the limit allowable speed of the engine crank, thereby improving the performance of the engine.

A valvetrain system may include a rocker arm assembly actuatable between a drive mode defining a drive valve lift profile of an engine valve, and a cylinder deactivation mode defining a recharge valve lift profile of the engine valve. The recharge valve lift profile begins after the drive valve lift profile. The recharge valve lift profile defines a recharge lift amplitude that is less than a drive lift amplitude. The recharge valve lift profile ends within 15% of an end of the drive valve lift profile. The recharge valve lift profile is defined entirely within the drive valve lift profile so that: when the rocker arm assembly is in the drive mode, movement of the engine valve is dictated by the drive valve lift profile, and when the rocker arm assembly is in the cylinder deactivation mode, movement of the engine valve is dictated by the recharge valve lift profile.

A valve train system can include a rocker arm assembly that can be actuated between a drive mode, which defines a drive valve lift profile of an engine valve, and a cylinder deactivation mode, which defines a recharge valve lift profile of the engine valve. The recharge valve lift profile begins after the drive valve lift profile. The recharge valve lift profile defines a recharge lift amplitude that is smaller than a drive valve lift amplitude. The recharge valve lift profile ends within 15% of the end of the drive valve lift profile. The recharge valve lift profile is completely defined within the drive valve lift profile, such that: when the rocker arm assembly is in drive mode, the movement of the engine valve is determined by the drive valve lift profile, and when the rocker arm assembly is in cylinder deactivation mode, the movement of the engine valve is determined by the recharge valve lift profile.

The utility model discloses a valve lift adjustable gas distribution mechanism relates to engine field. The valve lift adjustable gas distribution mechanism, including core shaft, first switching sliding sleeve, second switching sliding sleeve, adjusting unit, double cam mechanism and gas distribution subassembly, first switching sliding sleeve and second switching sliding sleeve all movably cover the outside of core shaft, and two adjusting units are connected with first switching sliding sleeve and second switching sliding sleeve respectively, and multiple double cam mechanisms are connected with first switching sliding sleeve and second switching sliding sleeve respectively, and multiple gas distribution subassembly is connected with multiple double cam mechanisms respectively. The valve lift adjustable gas distribution mechanism, the existing engine single cam structure assembly type camshaft is changed to the core shaft with first switching sliding sleeve and second switching sliding sleeve, and adjusting unit is added to control the axial switching movement of first switching sliding sleeve and second switching sliding sleeve, realizes two cylinder linkage's valve lift regulation.

The utility model discloses an adjustable valve lift device which comprises a valve adjusting device assembly, a lift adjusting shaft, an adjusting rod, a rocker, a rocker shaft, a rocker roller, a cam, a rocker connecting piece shaft, an elastic check ring for a shaft, a rocker connecting piece, a rocker, a tappet roller, a tappet shaft, a tappet, a supporting seat, a cam shaft, a fixed pressing plate and a valve. The device is simple in overall structure and convenient to machine, the valve can be adjusted in real time, the valve lift is adjusted in real time, transition is smooth, it is guaranteed that an existing valve gap is not affected in the lift changing process from the design principle, and operation reliability is high; in addition, the abrasion contact surfaces of the device are all roller mechanisms, so that the reliability and the service life of each part are greatly improved.

This invention discloses a stratified combustion system and control method for medium- and heavy-duty gas engines using ammonia-hydrogen fuel. The system employs a "three-intake valve + two-exhaust valve" arrangement, utilizing independent designs of two vortex intake manifolds on both sides and a central tumble intake manifold. The tumble manifold is used in conjunction with hydrogen injection, while the vortex manifold is used in conjunction with ammonia injection. Combined with a roof-type cylinder head and an eccentric guide piston, this constructs a stratified combustion system for ammonia-hydrogen fuel. This system can generate small-scale, high-intensity turbulence near the spark plug and maintain a locally rich hydrogen mixture, ensuring ignition stability. Outside the combustion chamber, large-scale vortices maintain rapid flame propagation of the ammonia mixture. This invention achieves controllable adjustment of intake volume and in-cylinder flow field across the entire operating range by dynamically adjusting the intake valve lift, in conjunction with a turbocharging system and an EGR system, thus improving the engine's thermal efficiency while maintaining its power performance.

The valve lift conversion control mechanism includes a hydraulic transmission device that includes at least two device bodies, a check valve and a solenoid valve. The device bodies are in communication with each other through an oil circuit. The solenoid valve is configured to supply oil to the oil circuit through the check valve. The second device body is configured to be pressed downwards by a second rocker arm to be driven to press the oil in the oil circuit to increase an oil pressure, and a first device body is configured to press a first valve controlled by a first rocker arm downwards under the increased oil pressure in the oil circuit. The valve system of the engine includes the valve lift conversion control mechanism.