Throttle valve opening sensor

Details Throttle valve opening sensor Throttle valve opening sensor

1996-08-29

1997-12-16

Dombroske, George M.

Measuring and testing

Simulating operating condition

Marine

3242072, 32420725, 73DIG3, G01B 730

Patent

active

056987781

ABSTRACT:
A sensor has a rotor mounted on a throttle shaft, permanent magnets mounted on an end of the rotor and rotatable together with the rotor and the throttle shaft, a Hall-effect element fixed on a rotational axis of the magnets for outputting an electric signal corresponding to the direction of the magnetic field, and a circuit member for compensating the temperature characteristics of the magnets and the Hall-effect element and for driving the Hall-effect element and processing the output from the Hall-effect element. A circuit chamber of the sensor is filled with silicon gel to add heat capacity to the circuit member. A resin member having notches around a periphery thereof is disposed in a connecting portion of the rotor at which the rotor is connected to the throttle shaft to block heat conduction from the shaft toward the magnets. Thus, the temperature conditions of the circuit member, the magnets and the Hall-effect elements are substantially equalized to achieve high precision in detection of the throttle valve opening regardless of external temperature changes.

REFERENCES:
patent: 4712420 (1987-12-01), Johansson et al.
patent: 4719795 (1988-01-01), Eitoku et al.
patent: 4866981 (1989-09-01), Matsumoto et al.
patent: 4893502 (1990-01-01), Kubota et al.
patent: 5055768 (1991-10-01), Plagens
patent: 5113692 (1992-05-01), Kouta
patent: 5157956 (1992-10-01), Isaji et al.
patent: 5332965 (1994-07-01), Wolf et al.
patent: 5460035 (1995-10-01), Pfaffenberger
patent: 5572120 (1996-11-01), Takaishi et al.

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