Internal-combustion engines – Engine speed regulator – Idle speed control
Patent
1998-12-02
1999-11-23
Kwon, John
Internal-combustion engines
Engine speed regulator
Idle speed control
12333916, F02M 300
Patent
active
059881399
ABSTRACT:
An engine control system digitally stores corresponding values of timing angles and engine speeds and selects the timing angles based on the operating speed of the engine. In the engine speed range near idle speed, the timing angle is set to a pre-selected angle after top dead center (ATDC) and the relationship between engine speed and timing angle calls for the timing angle to be advanced from the pre-selected angle after top dead center (ATDC) to successively advancing angles which subsequently increase angles before top dead center (BTDC) as the engine increases in speed. In one application, a timing angle of 10 degrees after top dead center (ATDC) is selected for a engine idle speed of approximately 800 RPM. This relationship, which is controlled by the engine control unit, avoids stalling the engine when an operator suddenly decreases the engine speed.
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Griffiths John M.
Hall Ronald L.
Wasilewski Kurt J.
Brunswick Corporation
Kwon John
Lanyi William D.
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