74 results about "Valve timing" patented technology

An intelligent heat pump system autonomously manages thermal regulation in heating and cooling modes using real-time sensor data and adaptive control algorithms. The system comprises a heat pump integrated with components including a supply valve, regulating valve, return valve, and compressor expander, along with multiple sensors configured to monitor temperature and pressure conditions at various points, including the reservoir, cold side, and hot side. A removable memory stores a directive file containing operational parameters, including target temperatures, valve timing, and pressure control data. A control unit with a processor executes firmware modules that include sensor calibration routines, motor and valve control logic, and an adaptive algorithm that continuously compares real-time sensor input against target parameters. Based on deviations, the system dynamically adjusts component operations to regulate refrigerant flow, internal energy, temperature, and pressure, thereby driving the system toward a steady-state thermal condition. This autonomous system ensures efficient performance, enhanced temperature stability, and optimal energy usage across a range of varying environmental conditions.

The invention belongs to the technical field of piston engines, and particularly relates to a variable-volume crankcase which is integrated with a deformable and automatically-recoverable device, a variable-volume cavity is formed in the crankcase through a deformable or slidable diaphragm, and particularly, an elastic reset element is arranged in the upper surface of the device, so that the variable-volume cavity is formed in the crankcase. It is ensured that the diaphragm can stably and regularly move and reset after deforming or sliding; power for deformation or sliding of the diaphragm comes from periodical extrusion of an engine crank to the diaphragm, by correctly matching a volume change curve of the crankcase with an air distribution phase, the volume of the crankcase is enlarged during air inlet, so that negative pressure in the crankcase is increased, the volume of the crankcase is reduced during scavenging, pressure in the crankcase is increased, and the service life of the crankcase is prolonged. The technical problems of insufficient air intake, low scavenging efficiency, power attenuation and the like of a two-stroke piston engine under the low air pressure condition are solved, and a feasible solution is provided for power improvement of a small aero-engine and power recovery in a high-altitude environment.

The invention relates to the technical field of automobile power control, in particular to a self-learning method and device of an engine, a vehicle, a medium and a program product.The method comprises the steps that under the condition that it is detected that the engine is started, if the rotating speed of the engine is within a certain rotating speed interval, the engine is started; and if a rotor of the variable inlet cam timing system of the engine is located at the initial position and the rotor of the variable inlet cam timing system of the engine is located at the initial position, entering a continuous self-learning mode, and collecting camshaft and crankshaft position signals of the variable inlet cam timing system so as to perform phase correction according to the camshaft and crankshaft position signals. Therefore, the problem that the valve timing control effect and the engine performance are affected due to signal deviation or response lag caused by the fact that engine control is conducted depending on fixed parameters or only based on an open-loop adjusting mode in the prior art, long-term operation of the engine and frequent working condition changes in a hybrid power mode are difficult to adapt is solved.

The invention belongs to the technical field of internal combustion engine power devices, and discloses a double-piston mechanism for an internal combustion engine, which comprises a cylinder body, and more than one cylinder is arranged in the cylinder body; an air inlet seat and an air outlet seat are installed on the upper portion and the lower portion of the cylinder body respectively, an air inlet pipe and an air outlet pipe are arranged in the air inlet seat and the air outlet seat respectively, and an air inlet channel and an air outlet channel are arranged in the air inlet pipe and the air outlet pipe respectively. A control device for gas distribution is arranged at the corresponding position of each cylinder; a high-pressure oil pump is arranged outside the cylinder body, and the high-pressure oil pump is communicated with the oil sprayer through a high-pressure oil pipe; a piston assembly I and a piston assembly II are symmetrically arranged in each cylinder body, and a bevel gear set I and a bevel gear set II which are matched with the piston assembly I and the piston assembly II to transmit power are further arranged in each cylinder body. The power performance of the internal combustion engine can be improved through the two piston assemblies, the device is small in size and light in weight, and single-machine fuel consumption and operation cost are effectively reduced.

The hydraulic oil can be reused without providing a check valve in the oil control valve.SOLUTION: The valve timing adjustment device includes a rotor 20 supported rotatably within a predetermined rotation angle range with respect to a housing 10 rotating together with a crankshaft and transmitting torque from the crankshaft to a cam shaft 70 by rotating together with the housing 10, an advance oil passage 41 supplying and discharging hydraulic pressure to and from an advance hydraulic chamber, a retard oil passage 42 supplying and discharging hydraulic pressure to and from a retard hydraulic chamber, an OCV30 supplying hydraulic pressure to the advance oil passage 41 and the retard oil passage 42 via a supply port 31a, a recycle oil passage 43 provided in the rotor 20 and connecting the advance hydraulic chamber and the retard hydraulic chamber to the supply port 31a, and a check valve 60 provided in the recycle oil passage 43 and communicating the hydraulic pressure side of the advance hydraulic chamber and the retard hydraulic chamber with the supply port 31a.SELECTED DRAWING: Figure 1

The electric valve timing control apparatus of the present application controls an electric valve timing apparatus which changes valve timing by changing a relative rotation phase of a camshaft with respect to a crankshaft of an internal combustion engine using a motor coupled to the camshaft, and includes a control section which, when changing the relative rotation phase of the camshaft using the electric valve timing apparatus after a stop process of the internal combustion engine, changes a phase changing method for changing the camshaft from a current phase to a target phase based on a relationship between the current phase and the target phase of the camshaft.

An intelligent heat pump system autonomously manages thermal regulation in heating and cooling modes using real-time sensor data and adaptive control algorithms. The system comprises a heat pump integrated with components including a supply valve, regulating valve, return valve, and compressor expander, along with multiple sensors configured to monitor temperature and pressure conditions at various points, including the reservoir, cold side, and hot side. A removable memory stores a directive file containing operational parameters, including target temperatures, valve timing, and pressure control data. A control unit with a processor executes firmware modules that include sensor calibration routines, motor and valve control logic, and an adaptive algorithm that continuously compares real-time sensor input against target parameters. Based on deviations, the system dynamically adjusts component operations to regulate refrigerant flow, internal energy, temperature, and pressure, thereby driving the system toward a steady-state thermal condition.

A valve train method for a dual-lift camshaft in a range-extending engine belongs to the field of automotive engine technology. The invention includes the following steps: Cam profile design: designing the cam profile of the camshaft, wherein the cam buffer section adopts a constant acceleration-constant velocity profile, and the cam working section adopts a high-power polynomial cam profile design method to design the first cam profile and the second cam profile respectively; Cam profile correction: using a cam profile dynamic correction method, obtaining the final first target cam profile and the second target cam profile used for machining the camshaft; Operating condition selection and valve drive: selecting the engine's operating point, and driving the valves to open and close according to the corresponding valve motion law through a rocker arm valve train mechanism to achieve valve train operation. This invention can solve the technical problems of existing fixed-lift camshafts in range-extending engines, which cannot simultaneously meet the requirements of economic operating conditions and rated operating conditions, as well as poor NVH performance and high mechanical losses.

The utility model provides an overhead valve guide air inlet type two-stroke engine which solves the problems that waste gas cannot be fully swept away due to the fact that a four-stroke working mode of a traditional overhead valve type engine is improved into a two-stroke working mode, and combustion efficiency and emission performance are poor. According to the technical scheme, the overhead valve guide air inlet type two-stroke engine comprises an engine body set and an air distribution mechanism provided with an overhead valve, an air guide pipe moving along with an air inlet valve rod through a support sleeve is arranged on the air inlet valve rod of the air distribution mechanism, the air guide pipe is close to the head of the air inlet valve, and a front end air outlet is reserved between the front end of the air guide pipe and the head of the air inlet valve. The rear port of the gas-guide tube communicates with the gas inlet channel; an air inlet cam of the air distribution mechanism is provided with an air inlet cam protruding part which pushes the front end of an air guide pipe of an air inlet valve to stretch into an inner cavity of the air cylinder body. By guiding and scavenging the inlet air, the engine can go deep into the cylinder body to purge the combusted waste gas, open the exhaust valve to work and fully sweep the waste gas, so that the scavenging efficiency is greatly improved, and the combustion efficiency and the emission performance are improved.

A fluid control valve unit includes: a fluid control valve including a sleeve that defines an axis and a spool slidably disposed in the sleeve; a passage member including an inner peripheral surface to which the sleeve is fitted, passages, an annular receiving part facing one end of the sleeve, an opening adjacent to the annular receiving part, and an annular groove formed adjacent to the other end of the sleeve and recessed from the inner peripheral surface; a filter member including an elastic part sandwiched between the one end of the sleeve and the annular receiving part and exerting a biasing force in the axial direction; and a snap ring fitted in the annular groove for receiving the other end of the sleeve and detachably receiving the spool.

The application discloses a timing chain assembling and adjusting device and method of a V-type engine and belongs to the technical field of passenger car engine research and development trial assembling and adjusting, and comprises a layered assembling module, a tensioning chain module and a tightening camshaft sprocket module.The layered assembling module is used for sequentially assembling an oil pump chain set, a left camshaft chain set and a right camshaft chain set and tightening an oil pump sprocket.The tensioning chain module is used for sequentially tensioning the left camshaft chain, the right camshaft chain and the oil pump chain.The tightening camshaft sprocket module is used for tightening a right-row camshaft sprocket, a right-in camshaft sprocket, a left-row camshaft sprocket and a left-in camshaft sprocket in a clockwise direction as a tightening sequence.The camshaft and the crankshaft are simultaneously operated, so that power transmission efficiency attenuation is reduced, valve timing lag is eliminated, engine valve timing precision, engine performance and quality are improved, the failure rate is reduced, maintainability and whole-machine reliability are improved, and the service life of the engine is prolonged.

Drive control device (50) for an internal combustion machine (20), the internal combustion machine comprising a fuel injector (21) configured to inject fuel, an intake timing variation mechanism (22) configured to control the opening / closing of an intake valve provided at an intake port, and an exhaust timing variation mechanism (24) configured to control the opening / closing of an exhaust valve provided at an exhaust port, wherein the drive control device comprises: a valve timing control unit (56) configured to perform a wetting reduction control to control at least one of the intake timing variation mechanism and the exhaust timing variation mechanism to reduce a fuel wetting quantity, which is a quantity of fuel adhering to a wall surface of the internal combustion machine facing an injection field in which the fuel is to be injected, by means of a counterflow blown back to the intake port when a request is made to reduce the fuel wetting quantity during a start of the internal combustion machine, wherein the valve timing control unit is configured to to execute no control other than the wetting reduction control in order to avoid advancing the intake valve opening timing before top dead center of the internal combustion engine's exhaust point during the first stroke after the internal combustion engine's start-up, and to implement the control as the wetting reduction control in order to advance the valve opening timing of the intake valve before the top dead center of the exhaust of the internal combustion engine during a second and later stroke after the start of the internal combustion engine.

The present invention provides a valve timing control device that suppresses relative rotational phase displacement when the engine is stopped, thereby enabling rapid displacement to a target phase during engine startup. The valve timing control device includes a driving-side rotor A, a driven-side rotor B, gear mechanisms 25 and 30, an electric motor M capable of displacing the meshing position of the gear mechanisms 25 and 30 by rotating a rotational shaft Ma, and a control unit 10a for controlling the drive of the electric motor M. After the engine E stops, the control unit 10a intermittently energizes one phase of the electric motor M for a specified period of time.

This invention discloses a variable timing device for a diesel engine intake valve, comprising a housing, an upper push rod, a lower push rod, a spring, a roller, and a hydraulic unit. The upper end of the housing has an oil inlet, an oil outlet, and a return oil outlet, and the middle of the housing has a transverse lubricating oil channel. The upper push rod is located in the oil chamber at the upper end of the housing, with a piston in the middle of the upper push rod positioned between the oil inlet and the oil outlet. The lower push rod is located in the cavity at the lower end of the housing, opposite to the upper push rod. The spring is fitted onto the middle of the lower push rod, and the roller is located in a groove at the bottom of the lower push rod, with its outer ring supported on the outer contour of the cam on the camshaft. The hydraulic unit is located on one side of the upper end of the housing. This invention adopts a two-section structure for the intake push rod, and the return oil path is controlled by a two-position, one-way solenoid valve. This allows for both normal intake timing and delayed intake timing during valve timing, achieving precise control of the valve opening and closing with high accuracy and stability.

A method and system for controlling a valving arrangement in a fluid converter are provided. The valving arrangement includes electronically controlled valves that regulate fluid flow to and from fluid chambers within the converter. The system monitors predefined parameters, including working fluid parameters and shaft rotational parameters, to dynamically adjust valve timing and control fluid flow. This enables precise control over the fluid converter's operation, allowing it to respond effectively to changing demands and operating conditions. The invention also encompasses the valving arrangement itself and a fluid power system incorporating multiple fluid converters and a shared valving arrangement.

The invention relates to a valve mechanism with adjustable cam profiles, which comprises a multi-profile cam shaft, and the multi-profile cam shaft drives a valve to move through a valve adjusting lever, an oil plug, a hydraulic switch and a spring. The position of the air distribution adjusting lever on the cylinder cover is determined through the oil distribution shaft and the fixed base and is fastened through a fixing bolt. The air distribution adjusting lever is communicated with the supporting body engine oil channel through the oil receiving disc and the sealing rubber ring and plays a role. According to the valve timing mechanism with the adjustable cam profile, adjustment of various cam profiles can be achieved, the valve timing requirements under different working conditions are met, the working process of an engine can be flexibly adjusted under the different working conditions, and economical efficiency and emission performance are improved; and meanwhile, the adjustment of continuous gas distribution parameters is converted into the adjustment of a few cam profiles, so that the complexity of an engine control system is greatly reduced, and the usability of the mechanism is improved.

The embodiment of the invention provides a signal acquisition method, device and equipment and a storage medium, relates to the field of reciprocating machines, and is used for acquiring a full-period signal of a reciprocating machine which comprises a first air cylinder. The method comprises the steps that first envelope energy of multiple impacts of the reciprocating machine is determined based on an envelope curve of a first vibration signal of a cylinder cover of a first air cylinder in an angular domain in a double-cycle mode and a first standard valve timing table of the reciprocating machine; determining a second envelope energy for the plurality of impacts based on the envelope curve and a second valve timing meter lagging a target angle relative to the first valve timing meter; based on the magnitude relation between the first total energy and the second total energy, the occurrence condition of the phase shifting phenomenon is determined, the first total energy is the sum of the first envelope energy, and the second total energy is the sum of the second envelope energy; and intercepting a single-cycle second vibration signal from the first vibration signal based on the occurrence condition. Therefore, the accurate cylinder cover angular domain full-period signal can be obtained.

The present application relates to the technical field of engine valve timing measurement, and discloses an engine valve timing measurement device, which comprises a driving mechanism and a measuring mechanism; the driving mechanism comprises a motor and a shaft coupling, the motor comprises an encoder, the output shaft of the motor is connected with the shaft coupling, and the shaft coupling is used for being connected with a crankshaft of an engine; the measuring mechanism comprises a base, a first displacement measuring device, a second displacement measuring device and a tappet component, and the first displacement measuring device is arranged on the base. The present application also discloses an engine valve timing measurement method, which comprises reading a first rotation angle alpha1 of the crankshaft when a piston actual top dead center is read by the encoder and a second rotation angle alpha2 of the crankshaft when a tappet lift is h, calculating a clamping angle beta of the crankshaft through the first rotation angle alpha1 and the second rotation angle alpha2, obtaining a rotation angle gamma of the crankshaft from a starting point of a valve lift m to a moving starting point of the tappet to the tappet lift h, and calculating a valve timing delta = beta-gamma. The present application does not need to replace the hydraulic tappet.

The embodiment of the invention provides an engine control method and device, electronic equipment, a vehicle and a storage medium, and the method comprises the steps that when it is confirmed that the vehicle meets engine starting and stopping conditions, pre-starting and stopping control is executed, and the pre-starting and stopping control is to control an engine cam of the vehicle to continuously move in the preset adjusting direction; and after the target pre-start-stop duration, the engine camshaft is controlled to stop moving in the preset adjusting direction, the vehicle is controlled to execute engine rotating speed adjusting operation, and engine start-stop control is completed. According to the embodiment, after it is confirmed that the vehicle meets the engine starting and stopping conditions and before the engine rotating speed is changed, the engine camshaft is made to move to adjust the valve timing position based on the pre-starting and stopping control, so that the effective compression ratio is changed, the gas compression pressure in the engine starting and stopping process is reduced, and the engine starting and stopping efficiency is improved. The vibration phenomenon during starting and stopping of the engine is effectively reduced, and the success rate and stability of relieving vibration of the engine are improved.

The present invention relates to a valve timing control device for controlling the opening and closing of a valve having a first pneumatic cylinder and a second pneumatic cylinder. The valve timing control device comprises a first valve body, a first control piston block and a second control piston block. The first valve body has a first air port and a second air port. The first control piston block is movably located in a first chamber of the first valve body. The second control piston block is movably located in a second chamber of the first control piston block. When air is supplied to the first air port, the air is first output to the second pneumatic cylinder via the second air port. When the second pneumatic cylinder reaches a saturation state, the air can further push the first control piston block to move, so that the air is output to the first pneumatic cylinder instead. The valve timing control effect is achieved by using the air transmission method.

Control system (28) for a fuel shut-off system (10) of a motor vehicle, the control system (28) comprising: a fuel shutoff module (30) that determines a delay fuel shutoff event and generates a fuel shutoff signal for shutting off fuel supply to an internal combustion engine (12) in response to the fuel shutoff module (30) detecting the delay fuel shutoff event; an oxygen storage module (32) that determines an amount of oxygen accumulated in a catalyst (36) located downstream of the internal combustion engine (12), and wherein the oxygen storage module (32) compares the amount of oxygen to an oxygen storage capacity of the catalyst (36) in response to the fuel shutoff module (30) determining the delay fuel shutoff event; and an intake valve timing module (52) that generates a phase signal to actuate a plurality of cam phasers (50) to move into one of a plurality of activated states to modify a valve timing to reduce a flow rate of oxygen to the catalyst (36) in response to the fuel cut-off module (30) determining the retard fuel cut-off event and in further response to the oxygen storage module (32) determining that the amount of oxygen stored in the catalyst (36) is less than the oxygen storage capacity; wherein the oxygen storage module (32) is configured to receive a first oxygen signal from a first oxygen sensor (46) located upstream of the catalyst (36) and determine an amount of oxygen entering the catalyst (36) in response to the first oxygen signal and an air mass flow of oxygen into the catalyst (36); wherein the oxygen storage module (32) is configured to receive a second oxygen signal from a second oxygen sensor (46) located downstream of the catalyst (36), and the oxygen storage module (32) is configured to determine the amount of oxygen downstream of the catalyst (36) in response to the second oxygen signal; wherein the fuel shutoff module (30) is configured to receive an engine speed signal from an engine speed sensor (38) coupled to the internal combustion engine (12), and the fuel shutoff module (30) is configured to determine an engine speed of the internal combustion engine (12) in response to the engine speed signal; wherein the oxygen storage module (32) is configured to receive a pressure signal from a pressure sensor (48) coupled to an intake manifold (18), the pressure signal indicative of a manifold pressure, and the oxygen storage module (32) is further configured to receive a temperature signal from a temperature sensor (49) coupled to the intake manifold (18), the temperature signal indicative of a manifold temperature; in response to the oxygen storage module (32) receiving the pressure signal and the temperature signal, the oxygen storage module (32) is configured to measure the pressure of the airflow through the intake manifold (18) and the temperature of the airflow through the intake manifold (18); and in response to the measured engine speed, the measured manifold pressure and the measured manifold temperature, the oxygen storage module (32) determines the air mass flow into the catalyst (36); wherein the oxygen storage module (32) is configured to determine the amount of oxygen stored in the catalyst (36) in response to the first oxygen signal and an estimated air mass flow rate into the catalyst (36).

Valve timing adjustment device (100, 100a-100i) to be installed on an end section of an output shaft (320) located in an axial direction (AD) at one end of the output shaft, wherein the output shaft is configured to receive a drive force transmitted from a drive shaft (310) in an internal combustion machine (300), and the valve timing adjustment device is configured to use hydraulic pressure to adjust the timing of a valve driven by the output shaft such that it opens and closes, wherein the valve timing adjustment device comprises: a housing (120, 120a) configured to rotate synchronously with the drive shaft; a vane rotor (130) which is received in an interior of the housing and divides the interior of the housing into a plurality of hydraulic chambers (140), wherein the vane rotor is configured to be rotated synchronously with the output shaft; a support spring (50, 50e, 50f) configured to bias the vane rotor relative to the housing in a forward displacement direction or a retardation direction, the support spring comprising: a twisted segment (52); an inner end segment (54, 54e) which is joined to one end of the coiled segment and projects inwards in a radial direction (RD); and an outer end segment (56, 56e) which is joined to another end of the coiled segment and projects outwards in the radial direction; and a bushing component (10, 10a, 10c, 10e) that is fixed to the wing rotor, wherein: The bushing component is formed in a stepped cylindrical tubular shape and includes the following: a large-diameter section (15, 15a, 15c, 15e) formed in a cylindrical tubular shape and located on a radially inner side of the coiled segment, the large-diameter section comprising a straight section (25) located on a radially outer surface of the large-diameter section and extending in the axial direction; and a small-diameter section (13) formed in a cylindrical tubular shape and connected to the large-diameter section on an axial side of the large-diameter section on which the output shaft is placed, wherein the small-diameter section is placed on a radially inner side of the housing and has an outer diameter that is smaller than an outer diameter of the large-diameter section; the coiled segment includes a contact section (58, 58f) located on a radially inner surface of the coiled segment and configured to contact the straight section; and a point of an end of the straight section, which is located on one axial side on which the output shaft is placed, coincides in the axial direction with a point of an end of the contact section, which is located on one axial side, or which is one axial side of the point of the end of the contact section.

The invention relates to a variable valve lift valve mechanism which comprises a cam assembly arranged on a cam shaft, and the cam assembly comprises a main cam and an auxiliary cam; the rocker arm assembly is arranged on the rocker arm shaft and comprises a main rocker arm linked with the main cam and an auxiliary rocker arm linked with the auxiliary cam; the maximum lift of a main valve lift line type generated by matching of the main cam and the main rocker arm is different from the maximum lift of an auxiliary valve lift line type generated by matching of the auxiliary cam and the auxiliary rocker arm. The valve assembly is connected with the auxiliary rocker arm; the invention discloses a plunger locking assembly. According to the variable valve lift valve mechanism, through collaborative optimization design of the two linear types, a complete buffer section can be provided in the first state of the main valve lift linear type and the second state of the auxiliary valve lift linear type, and it is guaranteed that the complete buffer effect is achieved in the valve opening and closing processes; therefore, the common impact problem in a traditional variable valve mechanism is effectively avoided, and the valve movement is more stable.

The control device is applied to an engine that uses hydrogen as a fuel. The control device includes a processing circuit that adjusts the valve overlap amount by controlling the valve timing of at least one of the intake valve and the exhaust valve. The processing circuit increases the amount of valve overlap when the engine is operated in the high-load, high-rotation range as compared to the case where it is not.

The utility model discloses a kind of hydrogen fuel piston type aero-engine special combustion systems, it is related to aero-engine technical field, including fuel supply system, ignition system, combustion chamber, electronic control system, air intake and exhaust system and valve timing mechanism;Fuel supply system includes gas cylinder, gas rail and hydrogen injector, gas cylinder is communicated with gas rail by pipeline, gas rail is connected with hydrogen injector, hydrogen injector is installed on cylinder cover and is set towards combustion chamber;Ignition system is installed on cylinder cover and is used to ignite combustion chamber;Electronic control system is signal connected with hydrogen injector and ignition system;Air intake and exhaust system is respectively arranged at the inlet valve and exhaust valve on cylinder cover, and valve timing mechanism is used to control the opening and closure of inlet valve and exhaust valve.The hydrogen fuel piston type aero-engine special combustion system can improve engine power and response speed, reduce fuel consumption rate, and avoid engine backfire.

The invention belongs to the technical field of valves, and particularly discloses an electromagnetic valve, a gas valve and gas equipment. The electromagnetic valve comprises an electromagnetic driving mechanism, a movable shaft assembly, a valve element assembly, a pressing piece, a pressing reset piece and a timing trigger piece. The pressing piece is arranged on the shell in a sliding mode and matched with the second end of the movable shaft assembly, the pressing piece can actuate the movable shaft assembly to slide to the adsorption position from the separation position when being pressed to the first position from the initial position, a conductive structure is arranged on the pressing piece, and the movable shaft assembly in the adsorption position can magnetically adsorb the valve element assembly to move to the opening position. The electromagnetic driving mechanism can drive the valve element assembly to move to the closing position in the power-on state. And the timing trigger piece is electrically conducted with the conductive structure when the pressing piece reaches the first position, so that the timing trigger circuit is conducted. According to the gas valve timing device, timing closing of the electromagnetic valve and the gas valve can be achieved through a simple and reliable structure, repeated timing can be conducted, and the use safety, reliability and convenience of the gas valve and gas equipment are improved.

The invention relates to a rocket test bed valve timing sequence closed-loop control method and system. The method comprises the steps that S1, the occurrence time Td1 when a previous valve acts is recorded; s2, comparing the occurrence time Td1 with the first action theoretical time Tt1 of the previous valve to obtain a time deviation delta t, namely delta t = Tt1-Td1; s3, if the time deviation delta t is larger than the time threshold value, the next valve is controlled to act according to the actual action time TS1 of the next valve; wherein the actual action time TS1 of the next valve is obtained by superposing the time deviation delta t on the second action theoretical time Tt2 of the next valve, that is, TS1 = Tt2 + / -delta t. According to the method, the action time of the previous valve is monitored in real time, the time deviation is calculated, and the action time of the next valve is dynamically adjusted, so that the accuracy of the action time sequence of the valve is ensured.

The invention discloses a hydrogen passive pre-combustion chamber control method based on residual gas content closed-loop integration, which comprises the following steps of: measuring residual gas pressure in real time and estimating residual gas content through a pressure sensor in a pre-combustion chamber, and only establishing a mapping relationship between the residual gas content and intake valve timing (VVT), a mapping relationship between the residual gas content and an ignition advance angle in an ECU (Electronic Control Unit); after the real-time residual gas content is compared with a preset threshold value, the intake valve closing phase (delay VVT), the throttle opening degree and the backward-moving ignition advance angle are dynamically adjusted, so that short-time high-pressure replacement pulses are formed, and pre-combustion is restrained; and when the residual gas content is reduced to the target level, the VVT, the throttle valve and the ignition advance angle are automatically recovered to the optimal value of ultra-lean combustion. According to the invention, closed-loop self-adaptive cleaning of residual gas is realized, and the precombustion chamber is ensured to be filled with fresh mixed gas and stably ignited under various working conditions.

The present invention relates to a supercharging method for a free-piston internal combustion generator. By constructing a simulation model of the free-piston internal combustion generator and changing the intake and exhaust pressure values according to different supercharging methods, relationship data one between the intake pressure, exhaust back pressure and the performance parameters of the free-piston internal combustion generator is obtained to determine a matching supercharger. Then, by changing the valve timing, the lengths and / or diameters of the intake pipe and the exhaust pipe, relationship data two between the valve timing, the lengths and / or diameters of the intake pipe and the exhaust pipe and the performance parameters of the free-piston internal combustion generator is obtained; the valve timing, the lengths and / or diameters of the intake pipe and the exhaust pipe of the free-piston internal combustion generator are adjusted. Finally, the adjusted free-piston internal combustion generator is supercharged by using the matching supercharger. Through the supercharging method of the present invention, precise matching between the free-piston internal combustion generator and the supercharger can be achieved.

The application discloses an engine starting failure fault positioning method, an electronic device and a storage medium, relates to the technical field of engine starting, and comprises a starting abnormality preliminary inspection stage, a fault identification stage, a processing and alarm stage and a prevention self-checking stage.The fault identification stage comprises the following steps: determining a fault cylinder according to the size relationship between actual pressure values in each cylinder and preset pressure values; and judging whether the current fault is a valve timing fault according to an abnormal noise signal of the fault cylinder.Through the setting of the starting abnormality preliminary inspection stage, the fault identification stage, the processing and alarm stage and the prevention self-checking stage, the engine cylinder fault can be accurately judged.Meanwhile, the fault cylinder can be determined according to the size relationship between the actual pressure values in each cylinder and the preset pressure values, and whether the current fault is the valve timing fault can be judged according to the abnormal noise signal of the fault cylinder, so that the valve timing fault in the cylinder can be further accurately judged, and the judgment accuracy is improved.