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
Isolated Australian coral reef fluorescent proteins and cell-based kinase or phosphatase platforms for cancer drug development
Catalyst composition with nanometer crystallites for slurry hydrocracking
System and method for providing advice to consumer regarding a payment transaction
Use of beta-adrenoceptor antagonists for the manufacture of a medicament of the treatment of disorders of the outer retina
Artificial engine sound control unit, approaching vehicle audible system, and electric vehicle having them
Frequency offset estimation apparatus and method of OFDM system
  Randomly Featured Patents
Rubber composition
Document feed apparatus
Token with electronic chip
System for accessing a memory comprising interleaved memory modules having different capacities
Technique for using a subcarrier frequency of a radio station to transmit, receive and display a message together with audio reproduction of the radio program
Detection of intervertebral disk orientation in spine images using curve evolution
Optical scanning device, line-image forming optical system therein, imaging adjustment method in the device and image forming apparatus
Insecticidal substituted-2,4-diamino-5,6,7,8-tetrahydroquinazolines
Rotating toolhead, especially for turning stationary workpieces
Combustion-engined setting tool