Patent Document ID: 20060095167
Application ID: 11046726
Patent Flag: 0

Claim One:
1. A driving situation detection system, comprising real curve radius arithmetic means, reference vehicle model and observer means, a differentiator unit, model curve radius arithmetic means, and an assessment unit, wherein: the real curve radius arithmetic means calculates a real curve radius and a cornering direction of a running vehicle; the reference vehicle model and observer means includes a linear reference model of the vehicle and a state space observer for estimating variable which cannot be measured directly, and calculates a vehicle body side slip angle of the vehicle using the linear reference model and the state space observer; the differentiator unit differentiates the vehicle body side slip angle to calculate a vehicle body side slip rate; the model curve radius arithmetic means calculates a model curve radius and an algebraic sign of the model curve radius based on the vehicle body side slip rate and a yaw rate; and the assessment unit generates assessment information about a driving situation of the vehicle by comparing the model curve radius and the real curve radius of the vehicle.