Idle control system for a crankcase scavenged two-stroke engine

Details Idle control system for a crankcase scavenged two-stroke engine Idle control system for a crankcase scavenged two-stroke engine

1989-09-18

1990-09-11

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123 73C, 123305, F02M 300, F02B 3304

Patent

active

049553410

ABSTRACT:
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 speed, the timing of fuel injection is advanced within the rotational cycle of the engine to increse 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.

REFERENCES:
patent: 2724371 (1955-11-01), Mallory
patent: 2746441 (1953-07-01), Kremser
patent: 3196859 (1965-07-01), Ziegler
patent: 4463733 (1984-08-01), Tsai
patent: 4509478 (1985-04-01), Ament et al.
patent: 4597368 (1986-07-01), Ament
patent: 4800862 (1989-01-01), McKay et al.
patent: 4807572 (1989-02-01), Schlunke

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