The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 22, 1992
Filed:
Mar. 27, 1992
Romuald M Jurewicz, St. Louis Park, MN (US);
Jay L Hanson, Bloomington, MN (US);
Jeffrey B Berge, Bloomington, MN (US);
Jayaram Seshadri, Minneapolis, MN (US);
Alan D Gustafson, Eden Prairie, MN (US);
David A Christiansen, Bloomington, MN (US);
Richard A Johnson, Murrysville Boro, PA (US);
Lowell B Naley, Minnetonka, MN (US);
Doyle G Herrig, Elko, MN (US);
Thermo King Corporation, Minneapolis, MN (US);
Abstract
A method of operating a transport refrigeration system having a compressor driven by a prime mover at a selected one of high and low speeds, an evaporator, and an evaporator blower driven by the prime mover. Refrigeration control provides an error value which controls the temperature of a load space to a predetermined set point via heating and cooling modes. The method includes the steps of driving the compressor at high speed during pull down, and injecting hot gas into the evaporator when the error is reduced to a predetermined value. The prime mover is maintained at high speed, to keep evaporator air flow at a high rate, continuing a relatively rapid temperature pull-down across the entire load space. The speed of the prime mover is reduced to low speed when the error is further reduced to a second value, which also initiates suction line modulation while maintaining hot gas injection.