Title:
METHOD AND APPARATUS FOR CONTROLLING IGNITION DURING ENGINE STARTUP
Document Type and Number:
WIPO Patent Application WO2002020980
Kind Code:
A3
Abstract:
A method (120) and apparatus (52) are disclosed for controlling ignition timing during startup of a two-stroke internal combustion engine (30) while avoiding ignition timing errors caused by engine speed fluctuations. A rotational component (58) of the engine (30), such as a flywheel, bears a plurality of spaced indicator markers (1-24, A-C) including a plurality of ignition triggering markers, each of which designates a position on the rotational component (58) that is acceptable for triggering ignition in a respective cylinder of the engine. Ignition in each cylinder is triggered upon detecting (124, 126) the associated ignition triggering marker and without taking engine velocity into account. Ignition timing errors that could otherwise be introduced due to erroneous assumptions based on engine speed therefore are avoided. The engine preferably incorporates measures to change over (138) to an ignition control scheme that takes calculated engine velocity into account when the calculated engine velocity exceeds a threshold engine velocity.
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Inventors:
KOERNER SCOTT
Application Number:
PCT/US2001/027474
Publication Date:
June 20, 2002
Filing Date:
September 05, 2001
Export Citation:
Assignee:
BOMBARDIER MOTOR CORP OF US (US)
International Classes:
F02B61/04; F02P5/15; F02P7/067; F02B75/02; (IPC1-7): F02P5/15; F02P7/067
Foreign References:
| US4873958A | 1989-10-17 | |||
| US5805450A | 1998-09-08 | |||
| US5325710A | 1994-07-05 | |||
| DE3115237A1 | 1982-11-04 |
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