Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1998-09-22
2000-08-15
Solis, Erick
Internal-combustion engines
Charge forming device
Fuel injection system
123456, 701105, F02M 5100
Patent
active
061020095
ABSTRACT:
This invention determines the output timing of the injection command signal to each of the injectors so that the fuel injection timing agrees with the basic target injection timing even when there are variations in the fuel injection timing among the injectors, and thereby improves the exhaust emission performance of the engine. The time T.sub.2 of an intersection between the straight line Lp representing an average Pa of the common rail pressure before it starts to fall and the first-degree approximation straight line Ld having a maximum inclination of fall of the common rail pressure is determined as the timing at which the common rail pressure starts to fall. Based on the time T.sub.2 and the average pressure Pa, the delay time .DELTA.Td which elapses from the output timing T.sub.0 of the injection command signal to each of the injectors to the actual fuel injection timing T.sub.1 is calculated. The output timing T.sub.0 for the injection command signal is determined as an instant the delay time .DELTA.Td before the basic target injection timing Tb, which is determined from the operating state.
REFERENCES:
patent: Re33270 (1990-07-01), Beck et al.
patent: 4217862 (1980-08-01), Fort et al.
patent: 5533492 (1996-07-01), Willey et al.
patent: 5535621 (1996-07-01), Glidewell et al.
Isuzu Motors Limited
Solis Erick
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