ROTATION SPEED DETECTING DEVICE FOR TURBO-SUPERCHARGER

摘要

PROBLEM TO BE SOLVED: To inexpensively detect the rotation speed of a turbo-supercharger by a small and strong device massproducible, and to dispense with the change of the structure of the turbo-supercharger. SOLUTION: A speed of rotation detecting device of a turbo-supercharger in an internal combustion engine comprises at least one piezoelectric acceleration sensor 10 and an evaluation circuit 11 comprising an analog filter device 13 for filtering an output signal of the acceleration sensor 10. The output signal of the filter device 13 is supplied to an electronic controller 17, a measuring device or a display device of the internal combustion engine as an input signal in a state of the analog voltage or a direct frequency signal through a frequency-voltage converter 15.