Patent ID: 7571033
Filing Date: 2009-08-04
Classification: B60T,B62D

Abstract:
1. A motor vehicle state detecting system for detecting an unstable state of a motor vehicle or alternatively a prognostic sign thereof, comprising: first detecting means for detecting an actual measured value of a first parameter corresponding to either a side slip angle or alternatively a steering angle of said motor vehicle; second detecting means for detecting an actual measured value of a second parameter corresponding to either an alignment torque or alternatively a transverse acceleration which said motor vehicle is subjected to; arithmetic means for arithmetically determining a third parameter relevant to a correlation which said first and second parameters bear to each other; reference value setting means for setting in advance a comparison reference value for said third parameter; motor vehicle behavior stability decision means for making decision that behavior of said motor vehicle is unstable when said third parameter departs from said comparison reference value; and vehicle speed detecting means for detecting a running speed of said motor vehicle as a vehicle speed, wherein said first detecting means is designed to detect an actual steering angle of said motor vehicle as an actual measured value of said first parameter, wherein said second detecting means is designed to detect as an actual measured value of said second parameter an actual alignment torque applied to said motor vehicle from a road surface in the course of running of said motor vehicle, and wherein said arithmetic means is designed to arithmetically determine the change rate of said actual alignment torque for said actual steering angle as a torque/steering-angle change rate which serves as said third parameter, wherein said reference value setting means is designed to set as a comparison reference value a predetermined range for said torque/steering-angle change rate in dependence on said motor vehicle concerned and said vehicle speed, and wherein said motor vehicle behavior stability decision means is designed to determine that behavior of said motor vehicle is unstable when said torque/steering-angle change rate departs from said predetermined range.