Ignition timing control system for internal combustion engine

Details Ignition timing control system for internal combustion engine Ignition timing control system for internal combustion engine

1994-01-25

1995-02-21

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123686, 123703, F01N 320

Patent

active

053904915

ABSTRACT:
An ignition timing control system for an internal combustion engine which can perform fast catalyst warm-up operation and prevent stalling at the restart of the internal combustion engine at a low temperature is disclosed. This control system judges whether the engine is in the start state or not, whether the cooling water temperature is lower than the specified temperature or not, and whether the intake air temperature is higher than the preset temperature or not. When these judgments are all affirmative, the system further judges whether the time after the start has reached the control starting time or not, and then whether the engine is in the idle operation state or not. When these judgments are both affirmative, the system sets the target ignition timing retard amount and the ignition timing gradual change time according to the intake air temperature, and then actually performs the ignition timing control according to the target retard amount and gradual retard time. Alternatively, the control system judges deterioration state of a catalyst and controls the ignition timing in dependence on the catalyst deterioration state and the intake air temperature.

REFERENCES:
patent: 4703733 (1987-11-01), Fukitomi et al.
patent: 5165230 (1992-11-01), Kayanuma
patent: 5201173 (1993-04-01), Fujimoto
patent: 5211011 (1993-05-01), Nishikawa
patent: 5233831 (1993-08-01), Hitomi
patent: 5303548 (1994-04-01), Shimizu
patent: 5315823 (1994-05-01), Nishikawa
patent: 5337556 (1994-08-01), Aihara

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