Hitachi, Ltd.

Hidekazu Yoshizawa

Kenichi Machida

When a variable valve mechanism which varies an opening characteristic of an engine valve is malfunctioned, the power supply to a drive circuit for the variable valve mechanism is stopped, and also a control signal to the drive circuit is cleared.

Driving control apparatus for motion mechanism and control method of driving control apparatus

In a V-type engine provided with a variable valve timing mechanism and variable valve lift mechanism for an intake valve, a torque difference between respective banks is obtained. In a region in which an opening area of the intake valve is larger than a threshold, valve timing of the intake valve by the variable valve timing mechanism is corrected so as to reduce the torque difference, whereas in a region in which the opening area of the intake valve is smaller than the threshold, lift characteristics of the intake valve by the variable valve lift mechanism is corrected so as to reduce the torque difference.

Method and apparatus for controlling variable valve actuation device in internal combustion engine

In an internal combustion engine equipped with a variable valve actuation mechanism, which varies a lift amount of an intake valve, when the lift amount is forcedly controlled at the minimum to learn a detection result of the lift amount at that time, a throttle opening, an ignition timing, and a fuel injection amount are corrected such that an engine torque is not largely decreased in association with a decrease in lift amount.

Apparatus and method for controlling variable valve actuation mechanism

In a control apparatus for controlling an intake air amount of an engine by variably controlling a lift amount of an intake valve, when a variable valve lift mechanism is failed, the control is switched to a control of the intake air amount based on an opening degree of a throttle valve, and also the opening degree of the throttle valve is restricted within an upper limit value in order to ensure a negative pressure utilized by a brake booster.

Growing community of inventors

Isesaki, Japan

Hidekazu Yoshizawa