PURPOSE: To regulate dispersion of linearity within a prescribed range, and improve yield of a sensor by correcting the linearity when linearity of an output voltage characteristic to a prescribed acceleration exceeds a prescribed value.
CONSTITUTION: An acceleration signal 30 generated from a centrifugal machine or the like and output voltage Vo corresponding to acceleration generated by a semiconductor capacity type acceleration sensor 1, are inputted to a control part 29. The control part 29 performs operation on linearity from the relationship between the acceleration and the output voltage, and compares a maximum value of the linearity with a prescribed value, and connects a terminal T1 to the ground when the maximum value is larger than the prescribed value. Then, a switch of the sensor 1 is turned on, and linearity of the prescribed voltage Vo can be improved by operating a linearity compensating circuit 14. Since the terminal T1 is not connected to the ground when the maximum value of the linearity is not more than the prescribed value, the switch 13 is turned off, and the compensating circuit 14 is separated, and improving the linearity is not performed.
NAKAZAWA TERUMI
MATSUKURA TETSUO
ASANO YASUHIRO
HITACHI AUTOMOTIVE ENG
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