Nissan Motor Company Limited

Akihiro Ilyama

Tomonori Urushihara

Kazuya Hasegawa

Koji Hiraya

Hiroshi Miyakubo

Tsuyoshi Taniyama

Ken Naitoh

In a fuel supply device which supplies fuel in a main tank (,) to a vehicle engine (,), a fractional distiller (,) fractionates the fuel in the main tank (,) into a high octane fuel component and a low octane fuel component, and stores these fuel components in subtanks (,). The high octane fuel component is supplied by a high pressure intermittent pump (,), and the low octane fuel component is supplied by a variable pressure pump (,), to a fuel injector (,) of the engine (,). A controller (,) identifies a running region by the rotation speed and load of the engine (,), determines the proportion of fuel components supplied to the engine (,) according to the identified running region and controls a discharge pressure of the variable pressure pump (,) so that the determined proportion is achieved. When the storage amount of one of the subtanks (,) falls below a minimum value, the proportion of fuel components supplied to the engine (,) from the other subtank (,) is increased.

Fuel supply apparatus of internal combustion engine

Stroke cycles of a self-igniting gasoline engine (,) comprising an intake stroke, compression stroke, power stroke and exhaust stroke are performed sequentially by a piston (,), and self-ignition of the fuel mixture is performed by compression of the fuel mixture in the compression stroke. The strokes of the piston (,) are detected by a sensor (,), and an electronic control unit (,) controls a valve timing adjustment mechanism (,) so that a sealed period occurs when both an exhaust valve (,) and intake valve (,) are closed in the vicinity of top dead center of the exhaust stroke. The electronic control unit (,) also controls the fuel injection timing of a fuel injector (,) so that fuel is injected into the combustion chamber (,) during the sealed period. The fuel injected into the hot gas in the sealed combustion chamber (,) causes pre-combustion reactions, and thereby modifies the gasoline composition to a more reactive composition containing aldehydes so that compression self-ignition occurs easily.

Compression self-igniting gasoline engine

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Zushi, Japan

Akihiro Ilyama