Digital or resistorless interval wiper switch and system
First Claim
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1. A digital resistorless interval wiper switch adaptable for controlling windshield wipers of a motor vehicle, comprising;
- a ganged switch having a plurality of switch decks, each deck having a plurality of positions equally and angularly spaced from an axis position;
a switch wiper on each of said ganged decks for angular reciprocal synchronous movement across said positions, each switch wiper electrically connected to a common node; and
at least one output on each deck respectively connected to one or more positions;
whereby as said switch wipers are rotated across said decks, the outputs from said ganged switch are adaptable to form a Gray code output equal to the number of positions on said decks.
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Abstract
The use of a Gray code ganged wiper switch and an electronic circuit controlling the washer-pump motor and wiper motor allow the use of a minimal number of wires in the overall interval wiper system than found in conventional systems. Circuit redundancy and Gray coding method provides several added reliability features at a low manufacturing cost. The system further provides a resistorless control of the several power output functions of the system.
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Citations
11 Claims
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1. A digital resistorless interval wiper switch adaptable for controlling windshield wipers of a motor vehicle, comprising;
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a ganged switch having a plurality of switch decks, each deck having a plurality of positions equally and angularly spaced from an axis position; a switch wiper on each of said ganged decks for angular reciprocal synchronous movement across said positions, each switch wiper electrically connected to a common node; and at least one output on each deck respectively connected to one or more positions; whereby as said switch wipers are rotated across said decks, the outputs from said ganged switch are adaptable to form a Gray code output equal to the number of positions on said decks. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A digital resistorless interval windshield wiper system comprising:
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a ganged rotary switch having three switch decks with at least eight positions on each of said decks, said switch having switch wipers synchronously rotatable on said decks addressing the identical position on each of said decks, and at least one output terminal for generating and one of said decks having at least two output terminals for creating a four bit Gray code from said output terminals; an electronic control circuit having at least four inputs, each input for receiving one of said four bit Gray code output terminals from said ganged switch, said electronic control circuit having logic means, and a timing circuit responsive to one or more inputs and operable for generating a plurality of pulsed signals, each signal having a predetermined time period; a plurality of relays operationally responsive to said logic means and said timing circuit for actuation; and a wiper motor electrically connected to one or more of said relays for reciprocally moving one or more windshield wipers across said windshield. - View Dependent Claims (9, 10, 11)
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Specification