Tachometer based on electrical ripple and calibrated by...

Details Tachometer based on electrical ripple and calibrated by... Tachometer based on electrical ripple and calibrated by...

G - Physics

01

P

G01P 3/44 (2006.01) F02D 41/34 (2006.01) G01M 15/00 (2006.01) G01P 3/48 (2006.01) G01P 21/02 (2006.01)

Patent

CA 2157540

The tachometer comprises a microphone for disposition next to the exhaust of the vehicle and an accelerometer for disposition adjacent to its engine. A selected one of the outputs is connected to an ADC which provides digital samples to a central processing unit. Also, the ripple from the battery is sampled and provided to the CPU. The CPU calculates a constant representing the relationship of the frequencies of the ripple samples and the mechanical samples and responds to the ripple samples and the constant to provide output signals corresponding to the speed of the engine. The speed is displayed.

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