Coarse and fine air supply control for closed-loop controlled ca

Details Coarse and fine air supply control for closed-loop controlled ca Coarse and fine air supply control for closed-loop controlled ca

1979-07-06

1981-12-01

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123437, 123490, 123445, 123438, F02B 3300, F02M 700, F02B 7510, F02G 300

Patent

active

043030491

ABSTRACT:
In a closed loop air-fuel mixture control system for carburetor-equipped internal combustion engines, an exhaust gas sensor provides a feedback signal to a control unit where the signal is modified to meet the control characteristics of the closed loop. The modified feedback signal is converted into digital pulses whose width varies with the amplitude of the feedback signal. Additional air is supplied to the engine through an air bleed in accordance with the magnitude of the analog feedback signal to provide a coarse control of air-fuel ratio and in response to the digital pulses to provide a fine control of the ratio. The mixture is controlled in a wide range of ratios to eliminate the need for calibration which would be required for fitting the closed loop system to the time-varying characteristics of individual carburetors.

REFERENCES:
patent: 3990411 (1976-11-01), Oberstadt et al.
patent: 4046118 (1977-09-01), Aono
patent: 4075835 (1978-02-01), Hattori et al.
patent: 4130095 (1978-12-01), Bewler et al.
patent: 4173957 (1979-11-01), Hattori et al.
patent: 4174689 (1979-11-01), Hosaka

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