Unisia Jecs Corporation

Hitachi, Ltd.

Haruhiro Iwaki

Satoru Watanabe

Hajime Hosoya

Koji Takahashi

Shigeo Ohkuma

Hidekazu Yoshizawa

When a constant speed running control is released during a changing operation of target vehicle speed, a target vehicle speed in just before the changing operation of target vehicle speed is set to a target vehicle speed at the time when the constant speed running control is resumed.

Constant speed running control apparatus for vehicle and method thereof

In an apparatus for, controlling a variable valve timing mechanism that variably controls valve timing of an engine by changing a rotation phase of a camshaft relative to a crankshaft due to friction braking of an electromagnetic brake, the rotation phase is controlled while limiting a change rate of the rotation phase.

Apparatus and method for controlling variable valve timing mechanism

In a variable valve timing apparatus for variably controlling the valve timing by changing a rotation phase of a camshaft with respect to a crankshaft, an abnormality diagnosis of the apparatus is performed on a condition that a change amount per unit time in a control target value of the rotation phase has been kept equal to or less than a predetermined limit value for a predetermined period or more.

Apparatus and method for diagnosing variable valve timing apparatus

In an air-fuel ratio feedback control of an internal combustion engine aimed to approximate an air-fuel ratio to a target air-fuel ratio set according to operating conditions of the engine, the feedback control is carried out using the feedback control amount which is computed according to a sliding mode control, having a deviation between the target air-fuel ratio and the detected air-fuel ratio detected by the air-fuel ratio sensor set as a switching function. According to the present invention, a simple air-fuel ratio feedback control is carried out according to an accurate sliding mode control with no dispersion for each engine, that is easy to design, and that can be applied generally to any kind of vehicle or engine. Further, by varying the feedback gain depending on operating conditions, by controlling the computing cycle of the feedback control amount, or by performing a Smith dead time compensation control, the influence provided by the dead time element existing in the control object is eliminated, thereby ensuring the response characteristic and stability of the control system.

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Atsugi, Japan

Haruhiro Iwaki