System for detecting the operation of the throttle valve

Details System for detecting the operation of the throttle valve System for detecting the operation of the throttle valve

1980-08-01

1983-07-05

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123492, 123493, 123494, 123440, 324176, F02D 3500

Patent

active

043912508

ABSTRACT:
A system for detecting the operation of the throttle valve of an internal combustion engine for an emission control system for internal combustion engines. The emission control system has a three-way catalyst convertor, a detector, such as an oxygen sensor for detecting the concentration of oxygen in the exhaust gases, an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture and an electronic controller. The system comprises a transducer, such as a potentiometer and a pair of sample-and-hold circuits, in which each gate thereof is periodically operated by pulse trains for sampling and holding the output voltage of the transducer, which pulse trains have a 180 degrees phase difference with respect to each other. Both sample-and-hold circuits are connected to an operational amplifier type comparator through relay switches. The relay switches are operated in synchronism with the pulses of the pulse trains for applying the increment of the output voltage of each sample-and-hold circuit into the non-inverting input of the comparator, whereby the angular velocity and operating duration of the throttle valve is represented by a voltage.

REFERENCES:
patent: 3335708 (1967-08-01), Beddoes et al.
patent: 4046118 (1977-09-01), Aono
patent: 4144847 (1979-03-01), Hosaka
patent: 4227507 (1980-10-01), Takase et al.

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