| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily and highly accurately detect the changing situation of the altitude of the center of gravity of a vehicle body on the basis of GPS reception information. <P>SOLUTION: The altitudes of the center of gravity of a vehicle body are detected by an RTK-GPS system. When the car is traveling in a straight line through a specific section at a specified vehicle speed or at a slower speed, a travel section corresponding to the specific section is set as a section of altitude detection. On the basis of the resonance frequency of altitude signal waveforms corresponding to the section of altitude detection, the mass M of the vehicle body is estimated, and the mean value of the altitude signal waveforms is computed to compute the mean value hz of the altitudes of the center of gravity. When the absolute value of the difference between a mean altitude hz0 of the center of gravity of travel information of the section of altitude detection registered as reference information and the mean value hz of the altitudes of the center of gravity of the section of altitude detection exceeds the absolute value of the amount Δhz of altitude difference based on a difference of mass computed on the basis of the mass M0 of the vehicle body registered as reference information and the mass M of the vehicle body by a threshold value TH or more, maintenance is recommended to a drive since the position of the center of gravity to a road surface has varied to indicate the possibility of anomalies in tires, suspensions, etc. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
