8 results about "Valve timing" patented technology

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 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 provides a computer-implemented method for estimating engine torque from an internal combustion engine (ICE) wherein the ICE includes a plurality of engine cylinders (14), a fuel delivery system (40) with a plurality of fuel injectors (34) arranged to selectively inject fuel in respective cylinders (14), an exhaust gas pressure sensor (64) arranged to generate a sensor signal in response to a pressure of exhaust gas from said ICE, and crankshaft position means (50.1) for generating signal(s) indicative of crankshaft (18) position within a cycle of said ICE. Injection events are performed to inject predetermined amounts of fuel via said injectors (34), in order to perform combustion events that generate torque and exhaust gas by combustion of said fuel amounts. According to the invention, the method comprises the steps of:  monitoring exhaust gas pressure over a predetermined analysis window corresponding to a combustion event in a respective cylinder (14), thereby obtaining exhaust pressure data;  processing the exhaust pressure data by computing an average pressure value of the exhaust pressure data and determining a pressure waveform from the pressure data;  feeding the average pressure value and the pressure waveform as inputs to a pre-trained neural network to output an estimated torque. A method of diagnosing an ICE is also presented that outputs an indicator of a presence or an absence of engine faults such as misfires, valve timing issues, and / or exhaust system blockages.

The valve timing control unit has a valve timing control mechanism constituted by a driving-side rotary body, a driven-side rotary body, a motor and a reduction gear that set the relative rotational phase, and a phase sensor unit that detects the actual phase of the driving-side rotary body and the driven-side rotary body. The valve timing control unit has a control section that controls the motor in the direction in which the phase difference between the actual phase and the target phase is reduced, and the control section includes a swing control section that swings the target phase in the vicinity of the maintained target phase when the target phase is maintained at a constant value and the variation amount of the actual phase is kept in a holding region where the variation amount is less than a set value.

The present application relates to the technical fields of energy conversion and energy saving, and discloses a gas-water flash power device, which comprises a body assembly, a positioning installation groove is formed on the top surface of the body assembly, a cylinder sleeve is installed in the positioning installation groove, and a working piston is movably installed in the cylinder sleeve. The present application introduces external industrial waste heat as a heat source, preheats the intake air and water injection, and realizes efficient power output. The present application optimizes the design of the body assembly, the crankshaft, the connecting rod, the valve timing and the high-pressure water injection system, and solves technical problems such as hydraulic lock cylinder, fouling and corrosion. The thermal efficiency is 30-40%, the device can be continuously operated for 24 hours, the overhaul life is greater than or equal to 20,000 hours. The whole device is manufactured by using mature internal combustion engine technology, has low cost and is easy to maintain, and can be widely used in waste heat recovery and utilization in high-energy-consuming industries such as steel, chemical industry, cement and power plant. The investment recovery period is about 2-3 years, and the device has significant environmental protection value and economic benefits.

This invention discloses a series-type interlocking toothed clutch, belonging to the field of electromagnetic clutch technology. It includes an end driving plate, an end driven plate, at least one set of intermediate clutches, an electromagnetic drive assembly, an interlocking toothed engagement assembly, and a reset assembly. The interlocking toothed engagement assembly consists of a grooved plate and interlocking toothed plates, with each intermediate clutch having a different number of teeth on its interlocking toothed plate. The reset assembly keeps the clutches in a normally closed engagement state. When energized, one clutch can be energized at a time, causing its corresponding interlocking toothed plate to disengage from the grooved plate. After de-energization, the interlocking toothed plate rotates to the next groove under the action of the reset assembly and automatically engages. This invention utilizes the different groove angles corresponding to different numbers of teeth, achieving precise control of a specified rotation angle with a single pulse current signal. It features a compact structure and extremely simple control, applicable to valve timing control in rotary engines, and can also be applied to robot joints, precision rotary tables, and other fields.

Combustion operation of an internal combustion engine (2) a series hybrid vehicle is automatically stopped and automatically restarted according to a power generation request. It is determined whether or not a catalyst temperature at the time of a restart request is equal to or higher than a predetermined activation temperature (S1, S2). If the catalyst temperature is equal to or higher than the activation temperature, substantially simultaneously with a start of motoring of the internal combustion engine (S9), fuel injection and ignition are started (S8). If the catalyst temperature is lower than the activation temperature, a valve timing is changed (S3) and a throttle valve opening is increased (S4) so as to increase volumetric efficiency, and the motoring is started (S5). When an elapsed time t from the start of the motoring reaches a required delay time tD (S6, S7), fuel injection and ignition are started (S8).

The application relates to a valve timing system of a V-type two-cylinder four-valve engine. The application comprises cylinder blocks arranged in a V type, cylinder heads arranged on two sides of the cylinder blocks respectively, two intake valves and two exhaust valves arranged on each cylinder head respectively, a combustion chamber of the cylinder head being a pinnacled combustion chamber, an air inlet of the cylinder head being arranged at the front end of the engine, an exhaust port of the cylinder head being arranged at the rear end of the engine, and a space for accommodating a valve timing system being formed in the middle of the engine; the valve timing system comprises a camshaft arranged in the middle of the cylinder block and driven to rotate by a crankshaft, four cams arranged on the camshaft in the axial direction, four tappets, four push rods, one end of each push rod being movably connected with a corresponding tappet, and a rocker arm mechanism comprising two rocker arm seats oppositely arranged on each cylinder head and intake rocker arms and exhaust rocker arms rotatably arranged on each rocker arm seat. Under the premise of meeting various requirements of the vehicle level, high performance, small size and low cost of the engine are realized.