×

Method of operating a transport refrigeration unit

  • US 5,123,252 A
  • Filed: 07/11/1991
  • Issued: 06/23/1992
  • Est. Priority Date: 07/11/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of operating a transport refrigeration unit to condition the air of a load space to a selected set point temperature, with the unit having a refrigerant compressor driven by a prime mover, return air and discharge air temperature sensors, and a plurality of control algorithms each comprised of predetermined unit operating conditions, comprising the steps of:

  • providing a first set of look-up tables associated with return air control;

    providing a second set of look-up tables associated with discharge air control,providing a third set of look-up tables,providing a plurality of look-up tables in each of said first, second and third sets of look-up tables, with said plurality of look-up tables defining low and high trip points for each operating condition, and the next potential low and the next potential high operating conditions for each operating condition, of each of the plurality of algorithms,detecting the conditions of the return air and discharge air sensors,using the first set of look-up tables when the detecting step indicates the return air sensor is functional,using the second set of look-up tables when the detecting step indicates the return air sensor is not functional and the discharge air sensor is functional,and using the third set of look-up tables when the detecting step indicates both the return air and discharge air sensors are not functional.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×