Control apparatus for refrigerated cargo container
Patent 4789025 Issued on December 6, 1988. Estimated Expiration Date: 
November 25, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 25, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3307618 3349840 InventorsAssigneeApplicationNo. 07/125213 filed on 11/25/1987US Classes:165/264, Simultaneous heating and cooling only in limited range around set point temperature62/217Back flow or pressure regulatorExaminersPrimary: Wayner, William E.Attorney, Agent or FirmInternational ClassesF25D 29/00 (20060101)F25B 41/04 (20060101) AbstractA method of closely controlling the supply air temperature delivered from an air conditioning unit into a mobile cargo container wherein the supply air temperature is compared to a desired set point temperature and a suction control valve in the air conditioner compressor inlet line is adjusted in response to the sensed difference between the supply air temperature and the set point temperature. Three different preprogramed control modes are available which are selected automatically in response to the amount of deviation between the compared temperatures that are used to bring the supply temperature down to the set point temperature and hold it under steady state conditions within &#b1;0.25° C. of the set point. A trim heater is placed in the supply air passage to warm the supply air any time the control valve is in a full closed position. This increases the heating load on the unit so that operating time of the unit will be prolonged and the compressor will not be cycling ON and OFF. | |
