Method and apparatus to control ignition timing during starting

Details Method and apparatus to control ignition timing during starting Method and apparatus to control ignition timing during starting

1984-09-06

1986-06-17

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

123480, F02D 4102

Patent

active

045949816

ABSTRACT:
To place the maximum combustion pressure, which occurs upon ignition, after the piston of an internal combustion engine (ICE) has passed upper dead-center (UDC) position upon starting, a predetermined time interval (Ti) is subtracted from the expected time the piston reaches UDC position, as determined by the time taken for a predetermined angular distance of the crankshaft to rotate; the time between the predetermined angular distances is extrapolated to determine the projected, or expected time of the UDC position. The predetermined time interval (Ti), which may be made dependent upon engine temperature, is then subtracted and the actual firing time computed, for example by counting-out in a counter the differential time interval determined by the subtraction. The timing intervals are preferably derived from a segmental marker system (20,21; A1,A2), in a counter (1), the extrapolation carried out in a multiplier (2) and the subtracting in a subtraction circuit (3). The system is preferably enabled upon closing of the starter switch (S) and may be disabled when a down-counter, determining the actual timing interval, has a negative count output.

REFERENCES:
patent: 4250858 (1981-02-01), Jeenicke et al.
patent: 4364344 (1982-12-01), Butemeister
patent: 4380983 (1983-04-01), Kobashi et al.
patent: 4416234 (1983-11-01), Ikeura
patent: 4442812 (1984-04-01), Mizuno et al.
patent: 4442813 (1984-04-01), Nagose et al.
patent: 4458646 (1984-07-01), Suzuki et al.
"Bosch Technical Reports", vol. 5 (1977), pp. 250-256.

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