Injection timing control device for distributor-type fuel inject

Details Injection timing control device for distributor-type fuel inject Injection timing control device for distributor-type fuel inject

1985-05-02

1986-06-10

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

With fuel pump

123449, 100285, F02M 3900

Patent

active

045936692

ABSTRACT:
An injection timing control device in a distributor-type fuel injection pump for an internal combustion engine having a filter arranged in the exhaust passage for trapping exhaust gas fine particles, and a sensor for detecting exhaust pressure upstream of the filter. A timer spring and a second spring having a smaller force than that of the timer spring are accommodated within a spring chamber at one end of a timer piston. While the timer piston is displaced from its initial position to a predetermined position in the injection timing advancing direction by pressure within a hydraulic pressure chamber at the other end of the timer piston, the second spring alone counteracts the displacement of the timer piston. When the timer piston is further displaced beyond the predetermined position in the injection timing advancing direction, at least the timer spring counteracts the displacement of the timer piston. A communication passage communicates the hydraulic pressure chamber with the spring chamber, which passage is selectively opened or closed by an electromagnetic valve in response to the exhaust pressure value detected by the sensor.

REFERENCES:
patent: 4452040 (1984-06-01), Kobashi
patent: 4478195 (1984-10-01), Dorenkamp

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