When the operating characteristics of an intake valve are changed by an intake valve stop mechanism (8), an ECU (26) outputs a command signal (control on) to a solenoid (68). At this time, a timing, at which the command signal is output to the solenoid (68), is determined on the basis of a rotational position of a crankshaft, calculated from a signal of a crank position sensor (28). However, the output timing is corrected on the basis of a rotational phase difference of a camshaft (4) with respect to the crankshaft.

Controller for internal combustion engine

In a vehicle provided with a power propulsion system of the mild-hybrid type, a BAS unit (EM) - constituted by an electric machine connected through a belt transmission to the shaft of an internal combustion engine - is exploited as the only propulsion engine of the vehicle in given operating conditions. The internal combustion engine is provided with a system for variable actuation of the intake valves which is controlled to reduce the pumping losses of the internal combustion engine in the phase in which such engine (ICE) is in cut-off condition and it is driven by the aforementioned BAS unit (EM). It is also provided for that the system for variable actuation of the intake valves be controlled to temporarily increase the pumping losses of the internal combustion engine in a phase in which it is required to accelerate the switching off of the engine.

Method for controlling a motor-vehicle provided with a propulsion system of the "mild-hybrid" type

A variable valve operating apparatus for an internal combustion engine includes a drive camshaft, and a driven cam lobe that is rotatably supported by the drive camshaft. The variable valve operating apparatus further includes a control sleeve that has a raceway surface, a center of which is eccentric with respect to a center of rotation of its own. The variable valve operating apparatus further includes a link mechanism that is connected to each of the drive camshaft and the driven cam lobe and has a control roller which is in contact with the raceway surface. The variable valve operating apparatus further includes an actuator that drives the control sleeve. The variable valve operating apparatus further includes a control amount of the actuator is controlled to change a moving amount of the raceway surface in the above described plane direction in accordance with an operation condition of an internal combustion engine.

Variable valve operating apparatus for internal combustion engine

A variable valve actuation apparatus for an internal combustion engine includes a first link arm which has a projected portion that is engageable with and disengageable from a guide rail, and which is displaceable in the axis direction of a camshaft, and a link shaft linked to the first link arm in such a manner as to allow rotation but constrain movement in the axis direction. When an electro-magnetic solenoid is electrified, the first link arm rotates about the link shaft so that the projected portion engages with the guide rail. In association with the displacement of the link arms that occurs during the engagement, the state of motion of second rocker arms changes, so that the opening characteristic of valves provided for each cylinder is switched.

Variable valve actuation apparatus for internal combustion engine

Methods are provided for improved control of valve activation/deactivation mechanisms. One example method comprises, adjusting an electromechanical actuator to actuate cylinder valve deactivation/activation mechanisms. The actuator is operated at multiple levels based on engine operating conditions.

Variable displacement solenoid control

Provided is a variable valve operating apparatus for an internal combustion engine, which can favorably reduce electric power consumption in a vehicle system that may stop the internal combustion engine during power-up of the vehicle system. A changeover mechanism 90 is provided which is capable of switching between a connection state in which a first rocker arm 96 and a second rocker arm 98 are in connection with each other via a changeover pin 112, 118 and a disconnection state in which the connection is released. The changeover mechanism 90 performs energization of actuators 130 for each cylinder in a case in which fuel supply to the internal combustion engine 12 is stopped in response to an establishment of a predetermined stop condition. The above-described energization of the actuator 130 for each cylinder is stopped in a case in which a crankshaft 78 of the internal combustion engine 12 stops rotating during an energization time period of the actuator 130 and in which the crankshaft 78 is not driven by an external power.

Provided is a variable valve gear of an internal combustion engine, which is capable of satisfactorily reducing in the power consumption of a vehicle system in which it may be happened that the internal combustion engine is stopped during the start of the vehicle system. The variable valve gear comprises a changeover mechanism (90) capable of changing over between a connection state in which a first rocker arm (96) and a second rocker arm (98) are mutually connected through changeover pins (112, 118) and a non-connection state in which the connection is released. The changeover mechanism (90) includes an electrically driven actuator (130). When supply of a fuel to the internal combustion engine (12) is stopped due to the establishment of predetermined conditions for stoppage, electric current is supplied to the actuator (130) of each cylinder. When the crankshaft (78) of the internal combustion engine (12) is stopped to rotate during supply of electric current to the actuator (130) and the crankshaft (78) is not driven by an external power, the supply of current to the actuator (130) of each cylinder is stopped.

Shinya Misaka

Papers

Variable valve operating apparatus for internal combustion engine

Variable valve gear of internal combustion engine