Resources Contact Us Home
Adaptive controller for electric power steering

Image Number 4 for United States Patent #4509611.

A torque transducer senses the operator exerted steering torque and provides an output signal which varies in magnitude from a low value representative of a large operator exerted steering torque in one direction through a mean value representative of no operator exerted steering torque to an upper limit value representative of a large operator exerted steering torque in the opposite direction. The controller develops a zero torque reference which has an initial value substantially corresponding to the mean value of the torque transducer output signal, and steering torque assist is developed in relation to the difference between the zero torque reference and the transducer output signal. In operation, the zero torque reference is shifted according to a predetermined time response characteristic in a direction to reduce the difference between it and the transducer output signal. Over a period of time, the shifting of the zero torque difference due to operator exerted steering torque tends to cancel out and the remaining shifting adaptively compensates the zero torque reference for drift and other like sources of error affecting the magnitude of the transducer output signal.

  Recently Added Patents
Food safety printer
Image forming apparatus with enhanced display of guidance information
Aspect ratio enhancement
Repeating frame battery with joining of cell tabs via welded-on male and female slip-fit connectors
Method and apparatus for detecting an intermittent path to a storage system
Servo write assembly
  Randomly Featured Patents
Container assembly
Optical fiber power splitter module apparatus
Use of 15-deoxyspergualine as a pharmaceutical
Camera module contamination reduction gasket
Method and system for shrinking a set of data using a differential snapshot, a watch-list structure along with identifying and retaining updated blocks
Method of producing low profile stent and graft combination
Adaptive smoothing system for fading communication channels
Method and apparatus for high-speed network rule processing
Arrangement in a sewing machine
Process for producing hydroxy aromatic ketones