| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal processor capable of sufficiently removing signal noise caused by an influence of the roughness or the like of a road surface from an output signal of a sensor detecting an attitude state of a vehicle such as a vehicle height sensor and a roll angular velocity sensor in a steady state travel state of the vehicle. SOLUTION: A steering angle/steering angular velocity measurement part 21 measures a steering angle X(t) of a vehicle 1 and calculates steering angular velocity Y(t) from the steering angle X(t). A travel state determination part 22 determines the travel state STS of the vehicle 1 based on the steering angle X(t) and the steering angular velocity Y(t). As the result, a cut-off frequency setting part 23 sets a cut-off frequency F to a low frequency FL for removing signal noise when it is determined that the vehicle 1 stably travels, and sets the cut-off frequency F to a high frequency FH for preventing a phase delay when it is determined that the vehicle 1 does not stably travel. Then, a low pass filter 24 makes only frequency components (HLf(t) and HRf(t)) not higher than the cut-off frequency (F) in vehicle height signals HL(t) and HR(t) of the vehicle height sensors 10L and 10R pass through respectively. COPYRIGHT: (C)2008,JPO&INPIT
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