ENGINE CONTROL DEVICE - YAMAHA MOTOR CO LTD

Title:

ENGINE CONTROL DEVICE

Document Type and Number:

WIPO Patent Application WO/2003/038261

Kind Code:

A1

Abstract:

An engine control device capable of detecting an acceleration state by using the phase of a crankshaft and an intake pressure so that an acceleration feeling can be provided accordingly, wherein the state of strokes is detected by using the rotating angle of the crankshaft and the intake pressure, pressure differences between intake pipe pressures detected at specified crank angles in an exhaust stroke and an intake stroke and intake pipe pressures detected at the same crank angles in the same strokes of a previous cycle are calculated as intake pressure differences &Dgr P_A−MIN, the calculated values are compared with thresholds set for the crank angles and, when the compared values are equal to or more than the thresholds, an engine is considered to be in an accelerated state, and the injected amount of fuel at the time of acceleration is immediately added to the injected amount of fuel in stationary state and then injected, the injected amount of fuel in stationary state can be provided by detecting an intake air volume by using the intake pressure, and the volume of an air&sol fuel passage ranging from a throttle valve to an intake port is made equal to or less than a piston displacement to increase the detection accuracy of the acceleration state and the intake air volume.

Inventors:

NAKAMURA MICHIHISA (JP)

Application Number:

PCT/JP2002/010945

Publication Date:

May 08, 2003

Filing Date:

October 22, 2002

Export Citation:

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Assignee:

YAMAHA MOTOR CO LTD (JP)
NAKAMURA MICHIHISA (JP)

International Classes:

F02D9/10; F02D41/04; (IPC1-7): F02D45/00; F02D9/10

Foreign References:

JP2002188536A	2002-07-05
JPH10184438A	1998-07-14
JPH1136969A	1999-02-09
US5635634A	1997-06-03
US4658787A	1987-04-21
JPH10227252A	1998-08-25

Other References: