| 摘要 |
PROBLEM TO BE SOLVED: To provide a detector for the number-of-rotations per unit time (r.p.m. hereinafter) of an engine by which the r.p.m. of the engine can be detected with a simple constitution even regarding a vehicle type on which a revolution sensor cannot be mounted or is hard to mount in conventional cases, to provide a system for analyzing a dynamic state of a vehicle by which the dynamic state of the vehicle is analyzed on the basis of the r.p.m. of the engine on the vehicle by the detector for the r.p.m. of the engine, and to provide a method for analyzing the dynamic state of the vehicle. SOLUTION: The detector for the r.p.m. of the engine is provided with a frequency-component detector which detects a frequency component proportional to the r.p.m. of the engine 12, on the basis of an electrical output of an alternator 13 driven by the engine 12; and an r.p.m. computing unit which calculates the r.p.m. of the engine, on the basis of the frequency component detected by the frequency-component detector. COPYRIGHT: (C)2003,JPO
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