Wide-band programmable tachometer and speedometer/odometer apparatus
First Claim
1. A wide-band programmable tachometer and speedometer/odometer apparatus to detect the rotational speed of an output shaft of an engine in a vehicle and to calculate the corresponding speed/mileage thereof, comprising:
- a sensor means for converting a mechanical motion of said engine into an electrical signal;
a signal frequency selecting means for adjusting said tachometer and speedometer/odometer apparatus to be used for either a high frequency (1.25 kHz to 33.5 kHz) or a low frequency (133 Hz to 1,248 Hz) engine;
a first amplifier for amplifying said signal from the output of said signal frequency selecting means;
a second amplifier connected to an output terminal of said first amplifier for amplifying a second time signal from said first amplifier;
a divider means receiving said signal from said second amplifier and dividing a frequency of said signal and outputting a plurality of signals with different frequencies;
a multiplexer means for selecting one of said different frequency signals;
a selecting means with a plurality of switches incorporated with said multiplexer means to enable only one of said different frequency signals outputted from said multiplexer means;
an F-V (frequency to voltage) converter converting said signal outputted from said multiplexer to a first DC voltage, a second DC voltage, and a third DC voltage;
a gain adjust means incorporated with said F-V converter for adjusting said first, second, and third DC voltages to be in an acceptable range;
a tachometer connected to said F-V converter and driven by said first and second DC voltages therefrom;
a V-F (voltage to frequency) converter for converting said third DC voltage from said F-V converter to a pulse signal;
a frequency divider means for dividing said pulse signal from said V-F converter and outputting a low frequency pulse;
a monostable circuit means for receiving said low frequency pulse and outputting a positive pulse;
a switch means for receiving said positive pulse as a control signal to switch ON;
an speedometer/odometer converter connected to said switch means and counting once for each switch ON.
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Accused Products
Abstract
A wide-band programmable tachometer and speedometer/odometer apparatus to detect the rotational speed of an output shaft of an engine in a vehicle and calculate the corresponding speed/mileage thereof. First, a converting device converts a mechanical motion of an engine into an electrical signal. Second, the electrical signal is amplified by two amplifiers and outputted as an amplified signal. Third, the amplified signal is sent to a frequency divider and then through a multiplexer. A selecting device is incorporated with the multiplexer to send out a signal with frequency in an operable range. An F-V converter is used to convert the signal from the multiplexer and to output a first, a second, and a third DC voltage. The second and the third DC voltages are used to drive a tachometer to display the rpm of an engine. The third DC voltage is sent to a V-F converter and through a monostable circuit unit and outputted as positive pulses. The positive pulses are sent to an speedometer/odometer counter to obtain a corresponding mileage.
11 Citations
7 Claims
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1. A wide-band programmable tachometer and speedometer/odometer apparatus to detect the rotational speed of an output shaft of an engine in a vehicle and to calculate the corresponding speed/mileage thereof, comprising:
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a sensor means for converting a mechanical motion of said engine into an electrical signal; a signal frequency selecting means for adjusting said tachometer and speedometer/odometer apparatus to be used for either a high frequency (1.25 kHz to 33.5 kHz) or a low frequency (133 Hz to 1,248 Hz) engine; a first amplifier for amplifying said signal from the output of said signal frequency selecting means; a second amplifier connected to an output terminal of said first amplifier for amplifying a second time signal from said first amplifier; a divider means receiving said signal from said second amplifier and dividing a frequency of said signal and outputting a plurality of signals with different frequencies; a multiplexer means for selecting one of said different frequency signals; a selecting means with a plurality of switches incorporated with said multiplexer means to enable only one of said different frequency signals outputted from said multiplexer means; an F-V (frequency to voltage) converter converting said signal outputted from said multiplexer to a first DC voltage, a second DC voltage, and a third DC voltage; a gain adjust means incorporated with said F-V converter for adjusting said first, second, and third DC voltages to be in an acceptable range; a tachometer connected to said F-V converter and driven by said first and second DC voltages therefrom; a V-F (voltage to frequency) converter for converting said third DC voltage from said F-V converter to a pulse signal; a frequency divider means for dividing said pulse signal from said V-F converter and outputting a low frequency pulse; a monostable circuit means for receiving said low frequency pulse and outputting a positive pulse; a switch means for receiving said positive pulse as a control signal to switch ON; an speedometer/odometer converter connected to said switch means and counting once for each switch ON. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification