Hitachi, Ltd.

Matsuharu Abo

Hiroshi Fujii

Yoshiyuki Tanabe

Koji Onishi

Toshio Ishii

Mamoru Fujieda

Junichi Yamaguchi

In the fuel cylinder injection engine with the supercharging machine, the ignitability deteriorates because the density of the fuel at the spray center becomes excessive due to the shrinkage of the fuel spray under the supercharging. As a result, the density of the smoke and the hydrocarbon exhaust rate increase. The mixture of the fuel and the air under the supercharging is promoted by the control by TCV installed in the suction port which is a divided spray and air flow generation mechanism and the valve timing control of the suction and exhaust valve, etc.

Internal combustion engine and fuel injection control device therefor

A control apparatus for a direct injection engine having an intake valve, an exhaust valve and a fuel injection valve for injecting fuel directly into a cylinder of the engine and in which fuel injection by the fuel injection valve is performed during intake stroke or during compression stroke of the engine, has combustion stabilizing device for stabilizing combustion in the cylinder. The combustion stabilizing device has next operation mode determination device for selecting either an operation mode of recovering the combustion stability by fuel injection during intake stroke or an operation mode of recovering the combustion stability by fuel injection during compression stroke when a deteriorated state of combustion is detected in fuel injection during compression stroke.

Control apparatus for a direct injection engine

The invention provide a control system for a direct fuel injection engine employing a valve varying mechanism, which can suppress mixing of burned gas and fresh air to maintain the combustion stability, can accelerate vaporization of sprayed fuel at the beginning of fuel injection to reduce the emission rate of HC, and can realize a reduction of NOx based on the effect of exhaust return. The control system for the direct fuel injection engine comprises a fuel injector. for directly injecting fuel into a combustion chamber, and valve varying drivers for variably controlling the opening/closing timing of each of an intake valve and/or an exhaust valve. A control unit controls the valve varying mechanism unit to introduce burned gas from an exhaust port into the combustion chamber and to inject the fuel during a compression stroke for effectuating stratified charge combustion. The control unit controls the valve varying drivers to provide a phase difference in the opening timing of two left and right valves constituting the intake valve and/or the exhaust valve, thereby generating a flow of the burned gas along a cylinder wall.

Growing community of inventors

Hitachinaka, Japan

Matsuharu Abo