Toyota Jidosha Kabushiki Kaisha

Toyota Jidosha Kogyo Kabushiki Kaisha

Ken Tanoue

Makoto Suzuki

Mamoru Yoshioka

Nobuyuki Kobayashi

Hiroki Ichinose

Yoshihiro Iwashita

Toshimi Kashiwagura

Masahiko Nakada

Haruyuki Obata

Yasuhito Tsutsumi

Hironori Okamizu

Takeshi Gouno

The variable valve timing control device according to the present invention controls the valve timing of the intake valves of the engine based on the optimum valve timing at the full load operation of the engine. Namely, the variable valve timing control device of the present invention determines the valve timing in accordance with the combination of the present engine load and the present engine speed in such a manner that the deviation of the valve timing from the optimum valve timing when the engine is operated in full load at the present speed does not exceed a predetermined maximum allowable value. Since the valve timing of the engine is always set within a range determined by the maximum allowable deviation from the optimum valve timing for the full load operation, when the engine is accelerated to the full load condition the amount of the change, i.e., the amount of the operation of the variable valve timing control device is kept always within the range determined by the maximum allowable deviation. Therefore, the time required for changing the valve timing to the optimum valve timing for the full load operation is always short regardless of the present operating condition of the engine. Consequently, the response of the valve timing control can be improved without increasing the operating speed of the variable valve timing control device.

Variable valve timing control device for an engine

A turbine, which is an essential portion of an air motor, is disposed midway along an air-intake passage communicating to combustion chambers of an engine. A generator is operably connected to an output shaft of the turbine. The generator has a function to control the rotational motion of the turbine in proportion to the magnitude of the generated electric energy, in addition to the original function of generating the electric energy. The generator is electrically connected to an air-intake control device. In other words, the air-intake control device includes a transistor, and potentiometer which includes a resistor and a sliding element. A positive electrode of generator is connected to an emitter of the transistor. Further, a base of the transistor is connected to an output terminal of the potentiometer, and a collector thereof to a battery. When the operation magnitude of an acceleration pedal is small, the current flowing through the base decreases. Therefore, the generator generates more electric energy. Along this condition, the generator regulates the rotation of the turbine in higher degrees. Consequently, the turbine becomes less rotatable. As a result, as it becomes difficult for the intake air to flow through the turbine, the flow volume of intake air to be introduced into the combustion chambers decreases.

Air-intake control system for internal combustion engine

An arrangement is disclosed for heating the suction gases of an internal combustion engine by utilizing the exhaust gases from the engine in order to promote the vaporization of the fuel contained within the suction gases while the engine is still in a cool state. In the arrangement, the high temperature exhaust gases from the engine are routed, by the control of a control valve rotatable between two positions in the exhaust manifold, around fins formed on the exterior wall of the bottom floor of the intake manifold for receiving the heat of the exhaust gases, and a covering is provided for enclosing the fins in a closed chamber. The covering, made of a heat resistant metal plate, is provided with inlet and outlet ports so as to introduce the exhaust gases into the chamber and drain the exhaust gases from the chamber. The covering is further provided with a vertical wall or walls which descend therefrom into the exhaust manifold so that the control valve comes into close contact with walls when the control valve is rotated to the two positions, respectively, in the exhaust manifold.

Arrangement for heating the suction gases of an internal combustion

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Okazaki, Japan

Ken Tanoue