Method and apparatus for adjusting fuel injection control

Details Method and apparatus for adjusting fuel injection control Method and apparatus for adjusting fuel injection control

1977-12-12

1981-07-14

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Fuel injection system

123485, 307267, F02D 502

Patent

active

042780616

ABSTRACT:
A fuel injection system of an internal combustion engine generates valve-actuating pulses for actuating electromagnetic fuel injection valves. The length, or duration, of these valve actuating pulses is a function of various engine conditions and they are generated by a pulse-length multiplying circuit from preliminary control pulses derived from two basic engine variables, e.g. engine speed and air flow rate. In order to compensate for the decreasing pressure drop across the injection valve orifice at high engine load due to increasing manifold pressure, the invention describes methods for lengthening the fuel valve-actuating pulses by engaging the pulse-length multiplying circuit, in order to change the charging or discharging times of the timing capacitor therein. Another method proposed is to engage the battery-voltage compensation circuit in the system to lengthen the valve-actuating pulses. Electronic circuitry to perform these corrections is also described.

REFERENCES:
patent: 3429302 (1969-02-01), Scholl
patent: 3483851 (1969-12-01), Reichardt
patent: 3734067 (1973-05-01), Glockler et al.
patent: 3741171 (1973-06-01), Dautel
patent: 3750631 (1973-08-01), Scholl et al.
patent: 3771502 (1973-11-01), Reddy
patent: 3824967 (1974-07-01), Gordon
patent: 3919981 (1975-11-01), Reddy
patent: 4040397 (1977-08-01), Leichle

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