Impedance discriminator responsive to operation of switches moun

Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile

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Details

307 10LS, 307116, 34082577, 200 6154, H02J 100

Patent

active

046581502

ABSTRACT:
Apparatus for effecting the impedance discrimination for use in an automobile comprises a plurality of switches (11-14) mounted on a steering wheel, and a plurality of first impedance elements (15-17) for providing a different impedance in response to the operation of each switch. A second impedance element (131) is coupled through a common slip-ring connection (8, 9) to the first impedance elements for feeding a current from a battery (1) to the first impedance elements (15-17) to generate a potential corresponding to the operation of one of the switches. A transistor (133) provides a horn activating signal when the potential reaches a predetermined value. A resistance network (141-144; 141-142, 150-154) derives a first value corresponding to the first potential and a second value corresponding to the battery potential. A potential discriminator (110) derives a relative value from the first and second values and detects which one of the switches is operated as a function of the relative value to generate a control signal associated with the operated switch.

REFERENCES:
patent: 3455411 (1969-07-01), Carp et al.
patent: 4028620 (1977-06-01), Kitagawa et al.
patent: 4118700 (1978-10-01), Lenihan
patent: 4340824 (1982-07-01), Shaw
patent: 4430576 (1984-02-01), Fowler
patent: 4453088 (1984-06-01), Moore

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