42 results about "Valve lift" patented technology

The invention relates to a rocker arm assembly with roller deactivation. More specifically, a variable valve lift rocker arm assembly may include an outer rocker arm body having a valve end and a cam end and configured to rotate about a first shaft. The inner rocker arm body may be configured to rotate about a first shaft or a second shaft and selectively and operably locked to the outer rocker arm body via a latch assembly. The latch assembly may have a first latch pin actuated by a latch pin spring, a second latch pin, and a third latch pin driven hydraulically, mechanically or pneumatically. The latch assembly may have a locked mode in which relative movement between the inner rocker arm body and the outer rocker arm body is locked, and an unlocked mode in which relative movement between the inner rocker arm body and the outer rocker arm body is permitted.

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 invention provides an engine in-cylinder brake test bench and a test method, relates to the technical field of engine test, and aims to solve the problem that an existing test bench cannot reproduce valve lift loss under a real high-pressure load. In the process that a power driving source drives a cam shaft to force a brake valve to open, the loading mechanism continuously applies a reverse mechanical acting force to the valve, so that a huge blocking load generated by high-pressure gas in a cylinder to the valve in a compression stroke of a real engine is approximately simulated physically; the valve and a transmission mechanism of the valve are passively in a real high-load stress state, so that lift reduction caused by elastic deformation or hydraulic compression of parts is simulated, a high-load operating environment in a cylinder is effectively restored, and real dynamic data including actual lift loss are measured.

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.

A rocker arm assembly is rotatable about a rocker arm shaft and comprises a first section and a second section. The first section is configured to accommodate a valve lift profile. The second section is configured to interact with one or more valves. The rocker arm assembly also includes an actuating assembly, which is switchable between a first state and a second state, and a tappet assembly, which is provided in a tappet bore and has a tappet axis angled with respect to a longitudinal axis of the actuating assembly.

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.

The invention discloses a rotor assembly, a motor, an engine and a vehicle. The rotor assembly comprises a rotor shaft, a shaft sleeve, a magnetic steel sleeve and a blocking part. The shaft sleeve is sleeved outside the rotor shaft and is in transmission connection with the rotor shaft, the shaft sleeve is provided with an annular glue storage groove, and an adhesive is arranged in the glue storage groove. The magnetic steel sleeve is arranged outside the shaft sleeve in a sleeving mode, the glue storage groove is sealed through the magnetic steel sleeve, and the magnetic steel sleeve and the shaft sleeve are bonded through an adhesive. The blocking part is connected with the shaft sleeve and located in the glue storage groove so as to block at least part of the adhesive from moving along with the magnetic steel sleeve in the process that the magnetic steel sleeve is arranged on the shaft sleeve in a sleeving mode. According to the rotor assembly, at least part of the adhesive can be prevented from moving along with the magnetic steel sleeve through the blocking part, the effective bonding area between the magnetic steel sleeve and the shaft sleeve is increased, and the bonding effect is improved. Therefore, the situation that the rotor cannot rotate normally when the VVL motor works is avoided, then it is guaranteed that the variable valve lift system can operate stably, and the situation of slow adjustment or adjustment failure is avoided.

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.

A rocker arm assembly (200) is rotatable about a rocker arm shaft (130) and includes a first portion and a second portion. The first portion is configured to receive a valve lift profile. The second portion is configured to operatively engage with one or more valves. The rocker arm assembly further includes a lost motion assembly (210) configured to absorb at least a portion of the valve lift profile; and a switchable unit (230) having an actuator assembly and a plunger (232) disposed within the plunger bore. Further, the switchable unit includes a plunger securing assembly (235).

Method for detecting coking in the intake tract of an internal combustion engine with direct fuel injection, throttle valve and variable intake valve lift control, comprising the following steps: - Determining a correction value (KW) which is calculated by the intake valve lift control as an offset value with a preset valve lift; - Performing an initial quantity deviation test, by which an initial air-fuel ratio value (w1) is determined from a lambda value (λ) measured during the initial quantity deviation test. real, 1 ) and a desired lambda value (λ soll, 1 ) the fuel combustion in the combustion chambers of the internal combustion engine, whereby in the first quantity deviation test a load control is carried out by means of the variable intake valve lift control; - Performing a second quantity deviation test, by which a second air-fuel ratio value (w2) is determined from a lambda value (λ) measured during the second quantity deviation test. real, 2 ) and a desired lambda value (λ soll, 2 ) the fuel combustion in the combustion chambers of the internal combustion engine, whereby in the second quantity deviation test a load control is carried out by means of the throttle valve; - Determining a comparative result (VE) from the first air ratio value (w4) and the second air ratio value (w2); - Determine whether coking is present in the intake tract of the internal combustion engine by combining the comparison result (VE) and the correction value (KW).

The present invention relates to an internal combustion engine provided with an optimized intake system. The engine derives from a traditional diesel cycle engine but is modified and optimized in its intake system to achieve performance superior to that of traditional diesel engines. According to the invention, some main characteristics of the timing system are modified to obtain, when required, a specific behavior of the intake valve lift curve. By operating in this way, it is possible to carry out an internal recirculation of the burnt gases, a reforming of the fuel (for example, from ammonia to hydrogen), a thermodynamic cycle similar to a Miller cycle.

A variable valve lift rocker arm assembly may include an outer rocker arm body having a valve end and a cam end. The outer rocker arm body may be configured to rotate around a first axle of the outer rocker arm body. The variable valve lift rocker arm assembly may include an inner rocker arm body configured to selectively and operatively latch to the outer rocker arm body through a latching assembly. The latching assembly may include one or more latch pins actuated by a first actuating assembly and a second actuating assembly to switch between a latched mode and an unlatched mode. In the latched mode, the relative motion between the inner rocker arm body and the outer rocker arm body may be locked. In the unlatched mode, the relative motion between the inner rocker arm body and the outer rocker arm body may be permitted.

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.

A valve train assembly includes a rocker arm assembly for actuating a brake valve. The rocker arm assembly has a rocker arm that is rotatable about a rocker arm shaft. An actuator is located at one valve end of the rocker arm. The actuator is movable between an extended position and a retracted position by a first predetermined distance. A cam is configured to engage a cam face of the rocker arm. The cam has a reloading lift profile dimensioned to move the valve end of the rocker arm according to the valve lift profile, which has a maximum height exceeding the first predetermined distance.

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 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 +).

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.

The utility model relates to a cylinder head assembly structure and an engine comprising the same and provided with a variable valve lift mechanism. The cylinder head assembly structure comprises a cylinder head, a cam shaft assembly, a cylinder head cover and a cooling water pump. The cylinder head comprises a first outer wall portion, a second outer wall portion, an upper combination face and a lower combination face, the upper combination face and the lower combination face are not parallel and form an included angle, and the lower combination face of the cylinder head is combined with a cylinder body. The first outer wall portion is adjacent to the sprocket, the first outer wall portion and the second outer wall portion are respectively located on opposite sides of the camshaft assembly in an axial direction of the camshaft, the upper junction surface overlaps the camshaft when viewed from a direction perpendicular to an axis of the camshaft and an axis of the cylinder block simultaneously, and the first outer wall portion is lower than the second outer wall portion. And the first outer wall part is lower than the cam shaft. Therefore, the cylinder head assembly structure provided by the utility model is lower in cost, smaller in size and more favorable for assembly.

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.

A variable valve device changes a valve lift amount in a cylinder head. The device includes: a camshaft having plural cams with different valve lift amounts; plural rocker arms in contact with the plural cams to move a valve; a switching mechanism that couples and separates the rocker arms by oil pressure; and an oil control valve that controls the oil pressure. The switching mechanism includes a hydraulic piston moveable forward and backward to couple and separate the rocker arms. First and second oil passages extend from the oil control valve to the hydraulic piston. The first oil passage includes an oil groove allowing oil to pass at a predetermined rotation phase of the camshaft. The second oil passage is opened and closed during forward and backward movement of the hydraulic piston. A bypass passage is provided for bypassing the oil groove when the second oil passage is closed.

Internal combustion engine device with a valve train device (10) comprising a valve lift switching unit (11) and having at least one cam track (12, 13) designed to open at least one exhaust valve at least temporarily during an intake phase (14), with a throttle device (15) designed to adjust an intake cross-section, and with a control and / or regulating unit (16) for adjusting the throttle device (15), where the control and / or regulating unit (16) is designed to adjust the throttle device (15) to set internal exhaust gas recirculation, and the throttle device (15) is arranged in an intake tract (17), and the control and / or regulating unit (16) is designed to adjust a throttle device position depending on an internal combustion engine temperature, and wherein the control and / or regulating unit (16) has a first operating mode designed for operation without internal exhaust gas recirculation and a second operating mode designed for operation with internal exhaust gas recirculation, and upon switching from the first to the second operating mode, the control and / or regulating unit (16) triggers a switching of the exhaust valves, wherein the valve lift switching unit (11) is designed to change a valve lift of the exhaust valves in discrete steps, and wherein the valve train device (10) comprises a plurality of exhaust cams (21) which at least partially each have partial cams (22, 23) arranged directly next to each other, which are provided for switching the valve lift of the exhaust valves.

The invention relates to a high-compression-ratio gas engine matching method and system, and the method comprises the steps: building a one-dimensional simulation model of a gas engine, and taking an initial geometric compression ratio, an initial intake valve lift curve and an initial exhaust valve lift curve as boundary conditions; based on a one-dimensional simulation model of the gas engine and universal working conditions of the engine, aiming at different set geometric compression ratios, gas inlet total parameters and gas exhaust total parameters are optimized, and a universal working condition effective compression ratio and universal working condition gas inlet and gas exhaust total parameter matching scheme meeting the lowest comprehensive oil consumption requirement under different road working conditions is obtained. According to the method, a parameter setting scheme which is most suitable for the geometric compression ratio of the engine and the intake and exhaust cam profile is determined, and collaborative optimization of the compression ratio and all parameters aiming at the common road working condition of the whole vehicle is achieved, so that the gas engine can achieve low-rotating-speed heat efficiency improvement through the high compression ratio; and the design matching of high compression ratio and low actual load can be realized through Miller cycle, so that the engine is superior to a pure high-compression-ratio engine type.

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.

A variable valve lift rocker arm assembly includes a latching axle assembly, an outer body comprising at least one valve end, an outer bore shaft, and an outer axle bore for receiving the latching axle assembly, an inner body comprising an inner bore shaft and an inner axle bore for receiving the latching axle assembly, and a roller operatively coupled to the latching axle assembly and the inner body. The outer body is operatively coupled to the inner body by the latching axle assembly. The outer body is configured to selectively rotate relative to the inner body via the rocker shaft. The latching axle assembly comprises a roller latch assembly operatively coupled to the inner body and to the roller. A first latch receiver assembly is operatively coupled to the outer body.

This invention relates to the field of valve technology, specifically to a lift valve for detecting pipe bursts. It includes a valve body cavity plate, inside which are formed a filtrate column cavity and a lift column cavity. The filtrate column cavity and the lift column cavity are connected near their upper ends. A closed ring platform is fixedly installed on the inner wall surface of the lift column cavity, located below the connection point between the filtrate column cavity and the lift column cavity. An outlet channel is formed inside the valve body cavity plate, with one end connected to the lift column cavity below the closed ring platform, and the other end connected to the outside. This lift valve, by actuating the valve lift handle, can achieve multi-channel diversion output control and simultaneously has a pipe burst or disconnection detection function, automatically closing the valve to reduce leakage losses. The valve requires no electrical components such as sensors, making it suitable for many locations without power.

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 application provides a valve rocker arm for acting on a cam of a camshaft of a valve system to provide different valve lifts, the valve rocker arm comprising an inner support (11) and an outer support (21), the outer support (21) being sleeved on the outer periphery of the inner support (11), two outer rollers (22) being arranged on the outer support (21), the outer rollers (22) being rotatable relative to the outer support (21), the outer rollers (22) being located between the outer support (21) and the inner support (11), and the outer rollers (22) being capable of contacting the cam when the valve rocker arm acts on the cam. The valve rocker arm according to the application has small friction with the cam and is not prone to wear.

The utility model discloses an engine intake manifold flow test bench, and belongs to the technical field of engine test equipment. The frequency converter is electrically connected with the fan, the fan is communicated with the pressure stabilizing box, the pressure stabilizing box is provided with a butterfly valve, the pressure stabilizing box is communicated with the pressure stabilizing barrel through an air inlet channel, the air inlet channel is provided with an air inlet flow meter and an air inlet flow differential pressure sensor, the pressure stabilizing barrel is communicated with the momentum meter, and the momentum meter penetrates through the test bed table to be communicated with the simulation cylinder sleeve. The test bed table is connected with the simulation cylinder sleeve and provided with a valve lift adjusting mechanism, the valve lift adjusting mechanism is provided with a push rod, and the push rod is provided with a displacement sensor and driven by a stepping motor. Through technical innovation and system integration, a full-process solution from test design, data acquisition to performance evaluation is constructed, powerful technical support is provided for research and development, optimization and quality control of the engine intake manifold, and the engine intake manifold test system has profound significance in promoting technical progress and product upgrading of the engine industry.