Throttle-position sensor for an electronic fuel-injection system

Details Throttle-position sensor for an electronic fuel-injection system Throttle-position sensor for an electronic fuel-injection system

1987-07-28

1988-04-26

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123478, 123488, F02D 4134

Patent

active

047397420

ABSTRACT:
Interpreted intake-manifold vacuum and engine speed are used to produce an electrical output signal that reflects throttle position. Since the device has no mechanical tie to the throttle, there is none of the hysteresis or mechanical wear that are characteristic of conventional throttle-position sensors. The device comprises a tachometer circuit which is modulated by the signal from a differential-pressure transducer, connected to track the instantaneous pressure drop across the engine throttle. The tachometer output controls the duty cycle of a pulse generator which, in turn, drives an output transistor; a reference potential is applied across the load resistor and emitter of this output transistor, and the output signal is obtained as a d-c control signal, upon filtering the signal from the collector of the output transducer. The transfer function of the device yields maximum output when there is little or no intake vacuum, e.g., at sustained high speed, and minimum output is obtained from minimum speed and maximum vacuum.

REFERENCES:
patent: 3884195 (1975-05-01), Murtin et al.
patent: 4131088 (1978-12-01), Reddy
patent: 4280465 (1981-07-01), Staerzl
patent: 4349000 (1982-09-01), Staerzl
patent: 4549517 (1985-10-01), Kamiyama

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