Method for determining the gradient of a roadway

Details Method for determining the gradient of a roadway Method for determining the gradient of a roadway

1995-12-07

1998-08-18

Nguyen, Tan Q.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

701 80, G01C 906

Patent

active

057971099

ABSTRACT:
The gradient of a roadway in the direction of travel of the vehicle is identified from signals present in the vehicle without any additional sensor systems. A freely rolling state of the at least one driven axle of the vehicle is detected at least once. In this state, the wheels of the driven axle also roll free of slip. In order to balance out the wheel speeds between the driven axles and the non-driven axles, the difference speed between the wheel speed of a driven axle and the wheel speed of a non-driven axle is identified. At the same time, the value of the braking, that is to say the value of the deceleration of the vehicle, is measured. The value of a gradient constant is identified from the identified values of the difference speeds and the braking operations. The gradient of the roadway can be determined with the gradient constant from the values of the difference speed and the values of the braking then identified. The gradient information can then be used to control the vehicle.

REFERENCES:
patent: 4352405 (1982-10-01), Marandet
patent: 5132906 (1992-07-01), Sol et al.
patent: 5187977 (1993-02-01), Koschorek et al.
patent: 5333944 (1994-08-01), Shirai et al.
patent: 5446658 (1995-08-01), Pastor et al.
patent: 5612686 (1997-03-01), Takano et al.

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