Fuel supply control with fuel pressure adjustment during fuel cu

Details Fuel supply control with fuel pressure adjustment during fuel cu Fuel supply control with fuel pressure adjustment during fuel cu

1996-11-26

1997-12-09

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123497, F02M 5100

Patent

active

056949022

ABSTRACT:
A fuel cut-off operation is delayed until a predetermined delay time period elapses after a fuel cut-off condition is satisfied. During the delay period, the voltage for driving a fuel pump is gradually dropped to decrease the rotation speed of the fuel pump gradually. Thus, the discharge pressure of the fuel pump is low and hence the rise of a fuel pressure immediately after the fuel cut-off operation starts can be prevented. After the fuel cut-off condition, updating of a fuel pressure feedback correction amount is prohibited until the fuel cut-off operation terminates. In this manner, a feedback control immediately after the fuel cut-off operation terminates is executed by using the feedback correction amount used immediately before the fuel cut-off condition to prevent the drop of the fuel pressure immediately after the fuel cut-off operation terminates. Thus, the fuel pressure can be maintained at a target fuel pressure.

REFERENCES:
patent: 4694796 (1987-09-01), Mori
patent: 4721083 (1988-01-01), Hosaka
patent: 4784103 (1988-11-01), Ohishi
patent: 4962742 (1990-10-01), Nishizawa et al.
patent: 5095877 (1992-03-01), Kikuchi et al.
patent: 5379741 (1995-01-01), Matysiewicz et al.
patent: 5483940 (1996-01-01), Namba et al.

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