F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
341/94
F02D 41/16 (2006.01) F02D 41/34 (2006.01) F02B 75/02 (2006.01) F02B 75/12 (2006.01)
Patent
CA 2020487
C-4173 IDLE CONTROL SYSTEM FOR A CRANKCASE SCAVENGED TWO-STROKE ENGINE Abstract of the Disclosure A method and apparatus for controlling the idling rotational speed of a direct fuel injected, crankcase scavenged, two-stroke engine are disclosed. This is accomplished by regulating the timing of engine fuel injection within the rotational cycle of the engine. If the engine idling speed is outside a predetermined range of speeds, containing a target idling peed, the timing of fuel injection is advanced within the rotational cycle of the engine to increase idling speed, or retarded to decrease idling speed. The value by which fuel injection timing is advanced or retarded is determined by the difference between the actual idling speed and the target idling speed. The target idling speed is made a function of engine operation temperature to assure that a cold engine will idle properly when first started. After fuel injection timing is changed, a predetermined period of time is waited before repeating the idle control steps, to allow engine speed to stabilize. The method also provides for advancing fuel injection timing by a relatively large amount in the event that the idling speed falls below a predetermined stalling speed. The stalling speed is made to depend upon engine operating temperature by equating it to the target idling speed reduced by a fixed quantity.
Buslepp Kenneth J.
Trombley Douglas E.
Buslepp Kenneth J.
General Motors Corporation
Gowling Lafleur Henderson Llp
Trombley Douglas E.
LandOfFree
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