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
Spalling utilizing stressor layer portions
Method and apparatus for managing backup channel in multi-channel environment
Image coding apparatus and image decoding apparatus
Control system of substrate processing apparatus, collecting unit, substrate processing apparatus and control method of the substrate processing apparatus
Maize variety inbred PH1CD7
Enhanced telephony services
Hybrid coatings and associated methods of application
  Randomly Featured Patents
Gun with pivoting barrel, rotary ammunition cylinder, and double action firing mechanism
Indication of data blocks in a frame received by a mobile phone
Thick-film varistors for TVSS
Quantum well thermoelectric material on organic substrate
Image capturing apparatus, method of controlling the same, and program
Automobile and toy replica thereof
LED lamp with a heat dissipation device
Television receiver
System and method for generating a 2D image from a tomosynthesis data set
Disk cartridge with judging recesses