Honda Giken Kogyo Kabushiki Kaisha

Yutaka Kohda

Ken Ogawa

Kazuhiro Ueda

Hiroshi Tagami

Naoaki Takeda

Kazuhiro Takashiba

Toru Kimura

There are provided a control system and method and an engine control unit for an internal combustion engine, which are capable of determining an amount of fuel to be injected during a two-stage fuel injection combustion mode and a duration period of this mode such that stable combustion and smooth transition between combustion and smooth transition between combustion modes are ensured. The control system includes an ECU and a crank angle sensor. The ECU calculates a demanded torque PME demanded of the engine, and determines which of the homogenous combustion mode, the stratified combustion mode, and the two-stage fuel injection combustion mode should be selected as the combustion mode of the engine, based on the demanded torque PME. The ECU determines an injection time period ToutD during the compression stroke in two-stage fuel injection combustion mode based on the engine rotational speed.

Control system and method and engine control unit for internal combustion engine

In a gasoline direct injection engine, the sloping surface formed on the top of the piston and the opposing roof surface of the cylinder head form mutually different angles with respect to a plane perpendicular to a cylinder axial line so that the intake air caught between the sloping surfaces of the piston and the opposing roof surface is gradually squeezed out of the gap between them, and is prevented from directly flowing into the recess at high speed. As a result, the mixture in the recess is kept at a favorable air/fuel ratio and the engine is enabled to operate in a stratified charge lean burn mode over a wide operating range.

Gasoline direct injection engine

There are provided a control system and method and an engine control unit for an internal combustion engine including two types of variable valve mechanisms capable of changing a camp phase and a cam profile, respectively, which system is capable of determining an amount of fuel to be injected as a value suited to charging efficiency at the time by simplified calculation processing, thereby performing the fuel injection control properly in a simplified manner. The fuel injection control system includes an ECU. The ECU searches a map for a multiplier term Ati for a high-speed cam or low-speed cam based on the rotational speed of the engine and the cam phase, and a map for an addend term Bti for the high-speed cam or the low-speed cam based on the rotational speed of the engine and the cam phase. The ECU calculates a basic fuel injection time period Tibase as the sum of the product of an intake pipe absolute pressure PBA and the multiplier term Ati and the addend term Bti (Ati&times;PBA&plus;Bti).

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Saitama-ken, Japan

Yutaka Kohda