Electronic car bumper

Details Electronic car bumper Electronic car bumper

1992-04-23

1995-02-28

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

180274, 340435, 340904, B60K 2810

Patent

active

053942922

ABSTRACT:
A plurality of sensitive high-frequency proximity switches are provided in the bumper of a car and obstacles can be accurately identified. The electronic car bumper includes: a plurality of sensor portions each having sensor plates, first loading coils, and a divided capacitor, and a reference resonance circuit having a reference capacitor, a second loading coil and a divided capacitor. An oscillator drives each of the sensor portions and the reference resonance circuit through switching devices, and a detector detects an output of the oscillator. A discrimination portion discriminates an output of the detector and provides a discriminated signal to an output portion corresponding to the sensors and the reference resonance circuit. A synchronous device switches the switching device and the discriminator portion in synchronization. A direct current amplifier has an output which is adjusted to a point at zero as a reference voltage for the output corresponding to the reference resonance circuit, and a comparator is adjusted to a threshold reference according to the reference voltage.

REFERENCES:
patent: 3366925 (1968-01-01), Aubert et al.
patent: 4208695 (1980-06-01), Noda et al.
patent: 4348652 (1982-09-01), Barnes et al.
patent: 4349858 (1982-09-01), Torenius et al.
patent: 4467313 (1984-08-01), Yoshino et al.
patent: 4661797 (1987-04-01), Schmall
patent: 4728932 (1988-03-01), Atherton
patent: 4887066 (1989-12-01), Marek
Abstract of "Obstacle Detection Sensor", Japanese Laid-Open Patent No. 60-186773, Hayashida.

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