Toyota Jidosha Kabushiki Kaisha

Hiroki Wada

Mamoru Yoshioka

Kimihide Horio

Kunihiko Nakata

Yasuhiro Ikuta

Kei Abe

A charging pressure control apparatus including a first duty control solenoid valve for controlling the opening degree of an exhaust bypass valve to thereby control a charging pressure during 'one-turbocharger-operation', and a second duty control solenoid valve for controlling the opening degree of a waste gate valve to thereby control a charging pressure during 'two-turbocharger-operation'. The operating conditions at high altitudes of the first duty control solenoid valve and the second duty control solenoid valve are made different from those at low altitudes so that the power characteristic of the turbocharged engine is as good at high altitudes as at low altitudes.

Charging pressure control apparatus for an internal combustion engine

The control apparatus is intended for use in controlling a variable-effective-length air intake system of the type which has two volumetric chambers connected, respectively, to two groups of engine cylinders and which incorporates a flow control valve for controlling the communication between the two volumetric chambers to vary the effective length of the intake system in response to the rotational speed and load of an internal combustion engine. The control apparatus comprises a control means that detects the rate of acceleration of the engine and selectively causes the flow control valve to be controlled according to the throttle valve aperture during an accelerating condition of the engine and according to the amount of intake air per one revolution of the engine during steady load condition. Such a selective control improves the responsiveness of the control apparatus during acceleration while ensuring accurate control during a steady load condition.

Apparatus for controlling a variable-effective-length air intake system

An air intake system for internal combustion engine comprises a surge tank the inside of which is divided by a partition wall into two elongated parallel volumetric chambers. The surge tank has a portion extending beyond the branch tube that is located most remote from an air inlet in the tank. The partition wall of the surge tank extension is provided with an aperture for communicating the volumetric chambers with each other. The aperture is opened and closed by a butterfly valve operated by an actuator in response to engine operating conditions, to match the effective length of the intake system with an engine speed. In a preferred embodiment, the surge tank extension provided with the butterfly valve and the actuator forms a valve assembly which is separate from the remainder of the surge tank.

Internal combustion engine air intake system with variable effective

A knock control device of an internal combustion engine incorporated with a device for controlling the spark timing and the fuel injection. The device for controlling the spark timing and the fuel injection comprises an electronic control unit. A knock sensor is mounted on the cylinder block for sensing knocking. When the output of the knock sensor is above a first predetermined level, retardation of spark timing is caused. When the output of the knock sensor is above a second level above the first level, retardation of spark timing is caused and the amount of fuel to be injected is increased.

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Toyota, Japan

Hiroki Wada