Patents by Inventor Richard M. Rajala

Richard M. Rajala has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Vehicle air conditioner refrigeration, automatic variable set point evaporator system therefor
    Patent number: 5335514
    Abstract: A method and software/firmware fixed capacity compressor control system for varying the set point temperature of a evaporator in response to changes in ambient temperature in order to produce optimum cooling in the passenger compartment of a vehicle while preventing frost from accumulating on the fins of the evaporator. The system includes an evaporator probe and an outside ambient sensor and firmware for computing set-point steady state temperatures values over a wide range of ambient temperature. Also circuits are provided for cycling ON and OFF a fixed capacity compressor in a manner to achieve optimum cooling in the passenger compartment of the vehicle in response to the computed evaporator set point temperatures.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: August 9, 1994
    Assignee: Chrysler Corporation
    Inventors: Robert P. Hennessee, David A. Barwin, Robert G. Rudzewicz, Richard M. Rajala