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
Use of LPA for encouraging pregnancy, and fertility agent
Method of isolating human neuroepithelial precursor cells from human fetal tissue
Method and device for monitoring and analyzing signals
Color stable manganese-doped phosphors
Immunotherapy in cancer treatment
Wire catalyst for hydrogenation/dehydrogenation reaction and manufacturing method therefor
Newly identified human rhinovirus of HRV-C and methods and kits for detecting HRV-Cs
  Randomly Featured Patents
Fish growing system
Safety device in a motor vehicle
X-ray television apparatus
Integrated metal processing facility
Collapsible trailer
Mixing faucet with water purifier
Disk controller response handler for write commands
Technique for depth of field viewing of images using an aspherical lens
Golf swing trainer
Emulation components and system including distributed event monitoring, and testing of an IC design under emulation