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
Deadline-driven parallel execution of queries
Polypeptides and immunizing compositions containing gram positive polypeptides and methods of use
Method of fabricating display device
Image processing device and information storage medium including motion vector information calculation
Three-dimensional shape data processing apparatus and three-dimensional shape data processing method
Lamination sheet
Pausing a VoiceXML dialog of a multimodal application
  Randomly Featured Patents
Automatic drip coffee maker
Portable terminal
Non-aerosol/aerosol dispensing of sunscreen sprays comprising spherical porous silica microparticles
Apparatus for cementing a casing string
Method and structure for replaceable gate electrode in insulated gate field effect transistors
Method and device for verifying the security of a computing platform
X-ray lens assembly and X-ray device incorporating said assembly
Optical scanner and image forming apparatus
Anode positioning system
Digital process calibrator