IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0728665
(1991-07-11)
|
|
발명자
/ 주소 |
- Hanson Jay L. (Bloomington MN) Howland Leland L. (Belle Plaine MN)
|
| 출원인 / 주소 |
- Thermo King Corporation (Minneapolis MN 02)
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| 인용정보 |
피인용 횟수 :
28 인용 특허 :
0 |
초록
▼
A method of operating a transport refrigeration system having a refrigerant compressor driven by an internal combustion engine. Microprocessor based electrical control maintains the temperature of a conditioned space at a desired set point via heating, cooling and null cycles, with the engine being
A method of operating a transport refrigeration system having a refrigerant compressor driven by an internal combustion engine. Microprocessor based electrical control maintains the temperature of a conditioned space at a desired set point via heating, cooling and null cycles, with the engine being started and stopped, as required. During the engine starting process, a suction line modulation valve, if used, is closed, engine pre-heat time is selected, including using engine temperature to access a look-up table, and current draw is checked during pre-heat. Excessive current terminates pre-heat. Control diagnostics checks the voltage level on both sides of a refrigerant high pressure switch, before initiating engine cranking. Prior to stopping the engine, a control option initiates a heating cycle for a short time when null is being entered from a cooling cycle, to warm the evaporator and prevent premature starting of the engine.
대표청구항
▼
A method of operating a transport refrigeration unit which includes microprocessor based electrical control for controlling the temperature of a conditioned space via heating, cooling and null cycles, and a refrigerant circuit which includes a compressor, a condenser, and an evaporator, and includin
A method of operating a transport refrigeration unit which includes microprocessor based electrical control for controlling the temperature of a conditioned space via heating, cooling and null cycles, and a refrigerant circuit which includes a compressor, a condenser, and an evaporator, and including a prime mover arrangement for driving the compressor which includes an internal combustion engine which is automatically started and stopped by the electrical control in response to predetermined conditions, comprising the steps of: sensing the temperature of the engine prior to each start thereof, pre-heating the engine prior to each start thereof, providing predetermined minimum and maximum engine pre-heat times for first and second predetermined engine temperatures, respectively, providing a look-up table which relates engine temperature to pre-heat time for engine temperatures between the first and second predetermined values, providing a plausible range for the engine temperature, determining if the sensed temperature is in the plausible range, said pre-heating step heating the engine for the predetermined maximum pre-heat time when the sensed temperature is not in the plausible range, determining the location of the sensed temperature relative to the first and second predetermined engine temperatures, said pre-heating step heating the engine for the minimum pre-heat time when the sensed temperature is at, and when it is above, the first predetermined temperature, said pre-heating step heating the engine for the maximum pre-heat time when the sensed temperature is at, and when it is below, the second predetermined temperature, and accessing the look-up table when the sensed engine temperature is between the first and second predetermined values, to provide a pre-heat time related to the specific engine temperature, said pre-heating step heating the engine for the pre-heat time obtained from the look-up table when the sensed engine temperature is between the first and second predetermined values.
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