Wiper control system for automotive vehicle facilitated front and rear wipers
First Claim
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1. A control system for an automotive wiper system including a front wiper and a rear wiper, comprising:
- a front wiper motor for driving a front wiper blade;
a rear wiper motor for driving a rear wiper blade;
a front wiper control circuit connected to said front wiper motor for producing a front wiper drive signal having a given frequency for driving said front wiper motor at said given frequency;
a rear wiper control circuit connected to said rear wiper motor for receiving said front wiper drive signal, and for dividing the frequency of said front wiper drive signal by a given value and generating a rear wiper drive signal for driving said rear wiper motor;
a vehicle speed sensor for producing a vehicle speed indicative signal having a value representative of the vehicle speed; and
means, responsive to said vehicle speed indicative signal, for deriving said given value based on the vehicle speed indicative signal value.
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Abstract
A wiper control system includes a rear wiper control circuit associated with a front wiper control circuit. The wiper drive signals generated in the front wiper control circuit are fed to the rear wiper control circuit. The rear wiper control circuit derives a rear wiper drive timing on the basis of the occurrences of the front wiper drive signals. The rear wiper driving frequency is generally lower than that of the front wiper driving frequency. The lower rate of the rear wiper driving frequency relative to the front wiper driving frequency is preferably variable depending upon the vehicle driving condition.
199 Citations
11 Claims
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1. A control system for an automotive wiper system including a front wiper and a rear wiper, comprising:
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a front wiper motor for driving a front wiper blade; a rear wiper motor for driving a rear wiper blade; a front wiper control circuit connected to said front wiper motor for producing a front wiper drive signal having a given frequency for driving said front wiper motor at said given frequency; a rear wiper control circuit connected to said rear wiper motor for receiving said front wiper drive signal, and for dividing the frequency of said front wiper drive signal by a given value and generating a rear wiper drive signal for driving said rear wiper motor; a vehicle speed sensor for producing a vehicle speed indicative signal having a value representative of the vehicle speed; and means, responsive to said vehicle speed indicative signal, for deriving said given value based on the vehicle speed indicative signal value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control system for an automotive wiper system including a front wiper and a rear wiper, comprising:
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a front wiper motor for driving a front wiper blade; a rear window motor for driving a rear wiper blade; a front wiper control circuit connected to said front wiper motor for producing a front wiper drive signal having a given frequency for driving said front wiper motor at said given frequency, said front wiper control circuit being operable in an intermittent mode for producing an intermittent signal for intermittently driving said front wiper motor with a predetermined interval; a rear wiper control circuit connected to said rear wiper motor for receiving said front wiper drive signal, and for dividing the frequency of said front wiper drive signal by a given value and generating a rear wiper drive signal for driving said rear wiper motor; a vehicle speed sensor for producing a vehicle speed indicative signal having a value representative of the vehicle speed; and means, responsive to said vehicle speed indicative signal, for deriving said given value based on the vehicle speed indicative signal value. - View Dependent Claims (10, 11)
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Specification