Tacho signal processing

Details Tacho signal processing Tacho signal processing

G - Physics

06

F

354/26

G06F 7/68 (2006.01) G06F 7/62 (2006.01)

Patent

CA 1301330

- 30 - ABSTRACT TACHO SIGNAL PROCESSING This invention relates to apparatus for producing a periodic output signal having a predetermined period ratio ? relative to a periodic input signal. Signals from a tachometer on a gearbox are received by a counter timer unit(11), the counter timer unit evaluates the number of clock pulses k° received from a clock(10) within each period of the tacho signal. A control unit receives values of k° from the counter timer and employs an algorithm based on the following equation to calculate a count value n°to be loaded into a register(30) for the next tacho period. n° = Image + Image where dK represents k-1 - k° . An accumulator(17) is connected via an adder(31) to the register(30) and at receipt of each clock pulse from the clock(10) adds the count stored in register(30) into the accumulator(17). An output is produced on line(34) when the accumulator(17) overflows.

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