Display unit of speedometer for automobile

Patent · Tue Mar 03 04:00:00 EST 1987

OSTI ID:6736375

Teshima, T; Funaoka, C; Robert, P H

This patent describes a display unit of a speedometer for an automobile, comprising: a constant speed running circuit capable of producing output signals indicative of a desired car speed; an actual car speed operational circuit capable of producing output signals indicative of actual car speed; a comparing circuit for comparing the amplitudes of the output signals of the constant speed running operational circuit and the actual car speed operational circuit; bar graph decoders receiving the output signals from the constant speed running operational circuit and the actual car speed operational circuit; an EX-OR circuit having inputs coupled to respective bar graph decoders and having an output; and OR circuit having inputs coupled to respective bar graph decoders and having an output; selector means coupled to the output of the EX-OR circuit and the output of the OR circuit and controlled by an output of the comparing means for connecting a selected of the outputs of the EX-OR and OR circuits to an output of the selector means; and a bar graph display comprising plural display segments and a driving circuit for activating selected of the segments.

• Assignee: Regie Nationale des Usines Renault, Boulogne-Billancourt
• Patent Number(s): US 4647901
• OSTI ID: 6736375
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320203* -- Energy Conservation
Consumption
& Utilization-- Transportation-- Land & Roadway
AMPLITUDES
AUTOMOBILES
COMPARATOR CIRCUITS
COMPUTER GRAPHICS
CONTROL EQUIPMENT
DISPLAY DEVICES
ELECTRONIC CIRCUITS
EQUIPMENT
LOGIC CIRCUITS
MEASURING INSTRUMENTS
SIGNALS
SPEED REGULATORS
VEHICLES
VELOCIMETERS
VELOCITY