| 摘要 |
PROBLEM TO BE SOLVED: To achieve high precision behavior control at a low cost by obtaining the variations of vehicular items used for controlling the behavior of an electric vehicle, without providing a plurality of sensors. SOLUTION: By driving front wheels and rear wheels of the electric vehicle in a stop state at the same phase in a reverse direction to each other, up and down vibrations are caused to occur to a car body via the elasticity of suspension devices and the vibration frequency is made to change within a range from 1 Hz to dozens of Hz to obtain a peak gain frequency f1 from its transmission characteristics (frequency characteristics) A, when the gain of the up and down vibrations of the car body peaks. While a peak gain frequency f0 is obtained in advance from the transmission characteristics (frequency characteristics) B, which is caused to occur in the similar manner as above under a reference vehicle weight (the vehicle weight when only a driver is on board), a vehicle weight variationΔm is obtained by the operation ofΔm=äk/(2π)<SP>2</SP>}ä(1/fl<SP>2</SP>)-(1/f0<SP>2</SP>)} from the difference between f0 and f1, using the spring constant k of the suspension devices. COPYRIGHT: (C)2005,JPO&NCIPI |
