Functionally monitored fuel injection system

Details Functionally monitored fuel injection system Functionally monitored fuel injection system

1997-04-25

1998-07-14

Moulis, Thomas N.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

123501, 123494, F02D 3100, F02M 3704

Patent

active

057788529

ABSTRACT:
The invention relates to a fuel injection system having an electrically actuatable injection pump which comprises a pre-stroke actuator for setting the start of injection and a flow rate actuator for setting the injection quantity. A control unit for controlling the injection quantity and start of injection emits an actuation signal which starts injection to the flow rate actuator, and an actuation signal for the start of injection to the pre-stroke actuator via an output lead for the actuation signal for the start of injection. According to the invention, the control unit protects the pre-stroke actuator against a short-circuit on the output lead by monitoring the control deviation at the start of injection between the actual value for the start of injection (detected by means of a needle movement sensor) and a desired value for the start of injection, which fixed as a function of the engine operating point. The unit takes protective measures if the control deviation at the start of injection is greater than a prescribable warning threshold value for longer than a prescribable time period.

REFERENCES:
patent: 4573347 (1986-03-01), Sekiguchi et al.
patent: 4669440 (1987-06-01), Takase et al.
patent: 4730586 (1988-03-01), Yamaguchi et al.
patent: 4844035 (1989-07-01), Takagi
patent: 5105788 (1992-04-01), Engel
patent: 5261374 (1993-11-01), Gronenberg et al.
patent: 5462032 (1995-10-01), Nakamura

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