Electric type tachometer for vehicles
First Claim
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1. An electric tachometer device comprising;
- signal generating means for generating a signal having a voltage and frequency proportional to an engine'"'"'s r.p.m.;
said generating means being connected to receive voltage pulses from said engine;
signal processing means receiving the output signal from said signal generating means and generating a binary coded decimal signal representing said engine r.p.m.;
display means for displaying the output of said processing means;
said display means comprising a plurality of sequentially illuminated segments;
drive means receiving the binary coded output of said processing means for driving said display means;
display select means for selecting a normal scale display or an expanded scale display;
said display select means changing the display scale by increasing or decreasing the number of segments to be illuminated per unit of r.p.m.
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Abstract
An electric tachometer having a bar-graph display representing revolutions per minute (r.p.m.) on two scales. One scale shows normal r.p.m. while an expanded scale is provided to more accurately indicate r.p.m. while an expanded scale is provided more accurately to indicate r.p.m. lower than a predetermined value. A detector determines whether engine r.p.m. is above a predetermined value and a selector switch permits selection to normal or an expanded display.
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Citations
12 Claims
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1. An electric tachometer device comprising;
- signal generating means for generating a signal having a voltage and frequency proportional to an engine'"'"'s r.p.m.;
said generating means being connected to receive voltage pulses from said engine;
signal processing means receiving the output signal from said signal generating means and generating a binary coded decimal signal representing said engine r.p.m.;
display means for displaying the output of said processing means;
said display means comprising a plurality of sequentially illuminated segments;
drive means receiving the binary coded output of said processing means for driving said display means;
display select means for selecting a normal scale display or an expanded scale display;
said display select means changing the display scale by increasing or decreasing the number of segments to be illuminated per unit of r.p.m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- signal generating means for generating a signal having a voltage and frequency proportional to an engine'"'"'s r.p.m.;
Specification