User calibrated electronic speedometer and odometer
First Claim
1. A programmable circuit for driving the magnetic deflection circuits of a rate measuring gauge, such as a speedometer or tachometer, and a related odometer circuit responsive to received electrical pulses representative of detected movement comprising:
- (a) logic means for applying current to said deflection circuits in a selected sequence to cause said gauge to provide an indication of the rate of the detected movement being sensed,(b) means for clocking said logic means through said selected sequence at a predetermined clock frequency each time one of said electrical pulses is received,(c) means programmable by the user for altering the output from said clocking means to calibrate said gauge to accurately represent the rate of movement being sensed,(d) said logic means including gate means for automatically maintaining said odometer unit in calibration with said rate measuring gauge.
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Accused Products
Abstract
A circuit is disclosed for driving an electronic speedometer (or tachometer) and an associated odometer of the type suitable for use in automobiles, trucks and tractors. The circuit includes a programmable divider which can be user calibrated so that a change in a system parameter, such as tire size, can be accommodated. The circuit employs a pulse generator producing timing pulses for a magnetically driven air core gauge. The timing pulses are produced in response to pulses indicative of the remote condition being sensed as, for example, wheel rotation or engine speed.
42 Citations
10 Claims
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1. A programmable circuit for driving the magnetic deflection circuits of a rate measuring gauge, such as a speedometer or tachometer, and a related odometer circuit responsive to received electrical pulses representative of detected movement comprising:
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(a) logic means for applying current to said deflection circuits in a selected sequence to cause said gauge to provide an indication of the rate of the detected movement being sensed, (b) means for clocking said logic means through said selected sequence at a predetermined clock frequency each time one of said electrical pulses is received, (c) means programmable by the user for altering the output from said clocking means to calibrate said gauge to accurately represent the rate of movement being sensed, (d) said logic means including gate means for automatically maintaining said odometer unit in calibration with said rate measuring gauge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification