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
Method for processing an algae medium containing algae microorganisms to produce algal oil and by-products
Apparatus and method for extracting cascading style sheet rules
Debugging using code analysis
Communication system including relay station and data frame for the communication system
Structure of pixel electrode
Method for reserving network bandwidth for versioned network services
Image output method and device, and image display
  Randomly Featured Patents
Jet printing ink and ink-jet recording method
Raman amplifier and raman amplifier adjustment method
Combined container and lids
Oscillator circuit having an expanded operating range
Hysteretic MEMS two-dimensional thermal device and method of manufacture
Printhead configuration
Automated process for counting and filling containers with meat and poultry products
Mid-span fall protection system
Wall heater extension
Umbrella handle