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:
May. 05, 1987
Filed:
Feb. 15, 1985
Gregory R Truckenbrod, Fridley, MN (US);
David A Christiansen, Bloomington, MI (US);
Herbert S Falk, Royal Oak, MI (US);
Richard A Johnson, Murrysville, PA (US);
Robert G Colclaser, III, Murrysville, PA (US);
Thermo King Corporation, Minneapolis, MN (US);
Abstract
A microprocessor based system monitors and controls a transport refrigeration system having a two speed compressor coupled to a condenser and an evaporator and further having two speed condenser and evaporator fans, a refrigerant modulating valve, and heater means to cool or heat a served space. A keypad is provided for operator entry of the temperature setpoint and for display selections. Return air and discharge air temperature sensors provide signals to the microprocessor for temperature control. The microprocessor is programmed to sequence or control the compressor, the fans, the modulating valve and the heater means for temperature control in accordance with one of four stored algorithms. One of the temperature sensors is used for control, and if it is detected to have failed automatic switchover is made to use of the other temperature sensor for temperature control. Various input signals from the refrigeration system and from the microprocessor hardware are processed by the microprocessor to provide a data log and data for display and to detect system faults for fault history storage and for protective control action.