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US 8,818,675 B2Granted
Method and device for ascertaining the speed of a motor vehicle
AssigneeRobert Bosch GmbH
InventorsMartin Schlemmer, Rafael Seiler
Life of this patent
Estimating the term…
Abstract
A method for ascertaining the speed of a motor vehicle with the aid of wheel rotational speed sensors. To improve the calculation of the vehicle speeds on the basis of the wheel speeds, a first group of wheels of the motor vehicle is decelerated and a second group of wheels of the motor vehicle is simultaneously accelerated.
Claims16
A method for ascertaining a speed of a motor vehicle with the aid of wheel rotational speed sensors, comprising:
- determining a reference speed of freely rotating wheels;
- decelerating a first group of wheels of the motor vehicle to the reference speed of the freely rotating wheels;
- and
- simultaneously accelerating a second group of wheels of the motor vehicle;
- accelerating the first group of wheels and simultaneously decelerating the second group of wheels in an additional method step;
- repeatedly alternating between method steps of:
- decelerating the first group of wheels and accelerating the second group of wheels, and
- accelerating the first group of wheels and decelerating the second group of wheels;
- and
- ascertaining the speed of the motor vehicle based on the repeatedly alternating step.
7 more elements
A control unit for ascertaining a speed of a motor vehicle with the aid of wheel rotational speed sensors, comprising:
- means for determining a reference speed of freely rotating wheels;
- means for decelerating a first group of wheels of the motor vehicle to the reference speed of the freely rotating wheels;
- and
- means for simultaneously accelerating a second group of wheels of the motor vehicle;
- means for accelerating the first group of wheels and simultaneously decelerating the second group of wheels in an additional method step;
- means for repeatedly alternating between actuating:
- means for decelerating the first group of wheels and accelerating the second group of wheels, and
- means for accelerating the first group of wheels and decelerating the second group of wheels;
- and
- means for ascertaining the speed of the vehicle based on the means for repeatedly alternating.
7 more elements
Dependencies are inferred from the claim text.