A first arm member and a second arm member are provided. The first arm member is positioned between a cam and a valve body to oscillate in synchronism with the rotation of the cam. The second arm member changes the angle of the first arm member in accordance with the rotation angle of a control shaft. The temperature prevailing in the neighborhood of the control shaft and cam is detected. The rotation angle of the control shaft is corrected so as to avoid the influence of the detected temperature.

Variable valve mechanism

A method to control valve patterns in a cylinder operating in a multi-stroke cylinder mode. Valves are controlled to improve drivability and emissions.

Valve Selection For An Engine Operating In A Multi-Stroke Cylinder Mode

A method to determine and control engine torque in an internal combustion engine. The method may significantly reduce torque strategy calculations and the calibration complexity.

Method of Torque Control for an Engine with Valves that may be Deactivated

A device for controlling an internal combustion engine, comprising a variable valve mechanism for varying opening areas (valve lift) or the working angles (valve-opening periods) of at least either the intake valves or the exhaust valves, wherein a pressure in the cylinder is calculated based on the opening area or the working angle of at least either the intake valve or the exhaust valve varied by the variable valve mechanism, and the internal combustion engine is controlled based on the pressure in the cylinder. Upon calculating the pressure in the cylinder based on the opening areas or the working angles of the intake and exhaust valves, it is possible to more suitably control the internal combustion engine based not only upon the peak combustion pressure in the cylinder like when a combustion pressure sensor is used but also upon a pressure in the cylinder at a moment other than the peak combustion pressure.

Controller of internal combustion engine

A method to control valves during multi-stroke cylinder operation. Valves are controlled to improve emissions and engine torque resolution.

Multi-stroke cylinder operation in an internal combustion engine

An internal combustion engine including solenoid-operated intake and exhaust valves is operable in a partial operating mode with at least one cylinder being deactivated, without suffering from vibration of the engine. Where particular cylinders are deactivated under cylinder deactivation control, the exhaust valve of each deactivated or inactive cylinder is opened for a certain period of time which starts ahead of the bottom dead center. The timing of opening the exhaust valve is determined so that the pressure within the inactive cylinder is lower than the atmospheric pressure when the exhaust valve is opened. The timing of closing the exhaust valve is determined so that the peak value of the pressure within the inactive cylinder becomes almost equal to the peak value of the pressure within active cylinders. Where the cylinders are successively deactivated with the engine operating on a six-stroke cycle, opening and closing actions of the exhaust valve are controlled so that an increase in the cylinder pressure due to compression of gas in the currently deactivated cylinder and an increase in the cylinder pressure due to combustion in an active cylinder do not occur at the same time.

Internal combustion engine having solenoid-operated valves and control method

A control device for controlling a solenoid driving valve functioning as an intake valve or an exhaust valve of an internal combustion engine and controlling an electromagnetic force required to open or close a valve disc according to a pressure acting on the valve disc. Specifically, a control device for a solenoid driving valve (78) for opening or closing a valve disc (40) by a cooperation between resilient forces of an upper spring (104) and a lower spring (106) and electromagnetic forces of an upper coil (98) and a lower coil (100), wherein a pressure acting on the valve disc (40) is detected directly or indirectly. A magnitude of an electromagnetic force for energizing the valve disc (40), when the valve disc is displaced from one of a valve open position and a valve close position to the other position, toward the other position is controlled according to a pressure acting on the valve disc.

Control device for solenoid driving valve

A solenoid valve device includes an engine valve which can move in an axial direction thereof, an armature which moves with the engine valve, an electromagnet which attracts the engine valve so that the engine valve moves in the axial direction, and a zero-lash adjuster mechanism which is interposed between the engine valve and the armature. Thus, the solenoid valve can positively actuate an engine valve between a fully closed position and a fully opened position without formation of a clearance between the engine valve and the armature. A current supplied to the electromagnet may be set in accordance with a value which is related to a relative position of the armature and the electromagnet.

Solenoid valve device

An internal combustion engine having an electromagnetic valve driving mechanism adjusts an amount of magnetizing current to be applied to the electromagnetic valve driving mechanism in accordance with a temperature or viscosity of a lubricant used in the electromagnetic valve driving mechanism. Accordingly, intake and exhaust valves can be driven with an electromagnetic force corresponding to a viscosity of the lubricant. Therefore, changes in opening-and-closing operation speeds of the intake and exhaust valves resulting from a temperature or viscosity of the lubricant that is supplied to a sliding portion of the electromagnetic valve driving mechanism can be reduced.

Internal combustion engine having electromagnetic valve driving mechanism and method of controlling electromagnetic valve driving mechanism

An internal combustion engine includes two intake side solenoid driving valve mechanisms for opening and closing intake valves by cooperation of an electromagnetic coil and a spring, and/or two exhaust side solenoid driving valve mechanisms for opening and closing exhaust valves provided on each cylinder. A controller commands a driving circuit to cause the valve-opening timing of the exhaust valves or the intake valves to be different.

Isao Matsumoto

Papers

Internal combustion engine having solenoid-operated valves and control method

Control device for solenoid driving valve

Solenoid valve device

Internal combustion engine having electromagnetic valve driving mechanism and method of controlling electromagnetic valve driving mechanism

Internal combustion engine and method for controlling valve of internal combustion engine