Method and apparatus for controlling fuel injection timing

Patent · Tue Apr 14 04:00:00 EDT 1987

OSTI ID:6456062

Miyaki, M; Fujisawa, H

A method is described for controlling fuel injection timing in a fuel injection pump for use in an internal combustion engine by operating means for changing fuel injection timing according to signals from first and second rotational position detectors which respectively detect the rotational position of a toothed wheel coaxially mounted on a drive shaft of the pump. The first detector is mounted on a pump housing and the second detector is mounted on a member rotatably provided around the drive shaft. The rotatable member is rotated by means of the injection timing changing means for changing fuel injection timing. The method comprises: (a) receiving signals relating to the rotational position of the toothed wheel by means of the first and second rotational position detectors; (b) computing a time interval T2 between the signal from the first rotational position detector and the signal from the second rotational position detector; (c) receiving a signal relating to the rotational position of the toothed wheel by means of the first rotational position detector; (d) computing a time interval T1 between two continuous and signals from the first rotational position detector; (e) computing the ratio of time interval T2 to time interval T1; (f) computing an advancing angle value indicative of an actual injection timing by multiplying the ratio (T2/T1) by an angle between two consecutive teeth of the toothed wheel; and (g) controlling the injection timing changing means so that the advancing angle approaches a reference advancing angle.

• Assignee: Nippondenso Co., Ltd., Kariya
• Patent Number(s): US 4656990
• OSTI ID: 6456062
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
ENGINES
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
HEAT ENGINES
INCIDENCE ANGLE
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MOTION
POSITIONING
PUMPS
ROTATION
SHAFTS
SIGNALS
TIMING CIRCUITS