Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1986-07-24
1987-12-08
Wolfe, Jr., Willis R.
Internal-combustion engines
Charge forming device
Fuel injection system
123488, F02D 4118
Patent
active
047112190
ABSTRACT:
A signal generator provides a non-linear fuel-control output signal, in response to an analog input-voltage signal which is linearly related to throttle setting. A multi-step switch divides into equal increments the full range of possible throttle-setting signals, and, in conjunction with a resistor network, provides a stepped output, the progression of which is a non-linear function of throttle setting. A dither circuit produces an oscillating sawtooth voltage of amplitude scaled to a one-step increment, and addition of this voltage to the throttle-setting voltage is effective to produce a smooth and effectively continuous non-linear output of the resistor network. A smoothing circuit at output of the resistor network yields a d-c output which is non-linearly related to the throttle setting. Non-linearity can be designed to various requirements merely by selection of component values in the resistor network, without change of the switch and without modifying or adjusting any of the componentry for input-signal supply to the switch.
REFERENCES:
patent: 3908614 (1975-09-01), Ironside et al.
patent: 4280465 (1981-07-01), Staerzl
patent: 4391250 (1983-07-01), Matsui
patent: 4561404 (1985-12-01), Kanno et al.
Brunswick Corporation
Wolfe, Jr. Willis R.
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