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
Fabrication of high gradient insulators by stack compression
LED driving circuit, LED illumination appliance, LED illuminator, and LED illumination system
Arcuate motion control in electrostatic actuators
Method for the hydrolysis of substituted formylamines into substituted amines
Expressive grouping for language integrated queries
Coating composition, and a process for producing the same
Vehicle wheel
  Randomly Featured Patents
Multifunctional multireactor control system with dynamic multiple protocols, templates and digital notebooks and methodology
Spring clamp assembly with electrically insulating shoe
Semiconductor device and manufacturing method for the same, circuit board, and electronic device
Nuclear fuel electrorefiner
Furnace wall construction
Laminated packing material with good gas and aroma barrier properties, and method for the manufacture of the material
Tie plate with cam shoulder bridge
Use of 2-nitropropanol, 2-nitroethane, and 2-nitroethanol for control of microbial pathogens
Loading apparatus for disk cartridge
Optical transmission apparatus