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Method-and-apparatus-for-improving-the-operational-characteristics-of-a-vehicle

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Method and apparatus for improving the operational characteristics of a vehicle

Details

Inventors: Hafner, Hans W.;
Assignee: Pfister GmbH (Augsburg, DE)
Primary Examiner: Lall; Parshotam S.
Assistant Examiner: Trans; V.
Attorney, Agent or Firm:

A method and apparatus for improving the operation of a vehicle detects unevennesses of the road on which the vehicle is moving by sensing oscillations at two positions of the vehicle arranged in spaced relationship behind each other in the direction of movement of the vehicle. The actual speed of the vehicle is determined by correlating the oscillations sensed and by multiplying the time delay therebetween with the distance of the two positions. The slippage of the wheels, which is an important parameter in particular for braking the vehicle, may be calculated by setting the determined actual speed into relation to the speed of the vehicle as derived from the rotary speed of the wheels. The vehicle may be controlled in dependence of this slippage and other parameters derived from the actual speed, the slippage and forces vertically acting onto the wheels of the vehicle.

DETAILED DESCRIPTION It is an object of the instant invention to provide a method and an apparatus for optimizing the operation of a vehicle.
It is a further object of the present invention to provide a method and an apparatus for improving the operation of a vehicle in extreme situations as the braking of the vehicle.
These and other objects of the instant invention are achieved by a method for improving the operational characteristics of a vehicle provided with wheels arranged behind each other in a moving direction of the vehicle comprising the steps of determining a first speed of movement of the vehicle dependent on the rotary speed of at least one of the wheels; sensing first oscillations at a first position of the vehicle, caused by the vehicle passing over unevennesses of a road during movement; sensing second oscillations at a second position of the vehicle located at a fixed distance behind the first position in the moving direction, caused by the unevennesses of the road; correlating the first and second oscillations for determining a time delay therebetween; calculating a second speed of the movement of the vehicle from the fixed distance between the first and second positions and the time delay; and setting the first and second speeds into relation to each other.
According to another aspect of the invention an apparatus for improving the operational characteristics of a vehicle provided with wheels arranged in a fixedly spaced relationship to each other in a direction of movement of the vehicle comprises: a device for determining a first speed of movement of the vehicle in dependence on the rotary speed of at least one of the wheels; a device for sensing first oscillations at a first position of the vehicle, caused by the vehicle passing unevennesses of a road during movement; a device for sensing second oscillations and a second position of the vehicle located at a first distance behind the first position in the moving direction, caused by the unevennesses of the road; a device for correlating the first and second oscillations for determining a time delay therebetween; a device for calculating a second speed of the movement of the vehicle from the fixed distance between the first and second positions and the time delay; and a device for setting the first and second speeds into relation to each other

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