Patents by Inventor Nils Gustaf Hjalmar Williamsson Jonsson

Nils Gustaf Hjalmar Williamsson Jonsson 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).

  • Determining the amount of working fluid in a refrigeration or heat pump system
    Patent number: 5724822
    Abstract: In a compressor-operated refrigeration or heat pump system (10), the existing values of at least two variable quantities, consisting of the temperature or the pressure at different preselected places (16, 17, 18, 19) in the system (10), are sensed. The sensed values of said quantities or at least one value of at least one other variable quantity, derived from said sensed values, being utilized for determining the existing amount of working fluid in the system (10) based upon a previously established relationship between said amount and the value or values, respecitvely, of the utilized quantity or quantities. At least two different preliminary approximate values of the amount of working fluid are determined while utilizing values of at least partially different variable quantities, whereupon a resultant approximate value is determined based upon said preliminary values.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: March 10, 1998
    Assignee: Nira Automotive AB
    Inventors: Nils Gustaf Hjalmar Williamsson Jonsson, Mats Hugo Rolf Dahlgren, Eric Gustav Granryd