Refrigeration – With indicator or tester – Operatively correlated with automatic control
Patent
1992-11-13
1993-06-29
Rivell, John
Refrigeration
With indicator or tester
Operatively correlated with automatic control
62129, 62230, 623231, 123198D, F25B 4900
Patent
active
052223680
ABSTRACT:
A method of detecting conditions during the operation of a transport refrigeration unit (20) which may cause shutdown, and then modifying the operation of the unit in an attempt to find an operating condition that will keep the unit operating safely. The unit includes a compressor (26) driven by an engine (30) operable at low and high speeds. Upon detecting (264) an over-temperature condition of the engine a first modification (282) is initiated, including switching the engine to low speed. If the engine temperature does not drop to a safe value (288, 292), a second modification (296) is initiated. If the engine was in low speed (280) when the over-temperature condition was detected, the second modification is initiated immediately. Upon detecting (314) a low oil pressure condition, the engine is switched (316) to high speed. If the oil pressure rises to a safe level, engine operation is continued at high speed. Appropriate alarms (326) accompany the modified operating conditions.
REFERENCES:
patent: 4324286 (1982-04-01), Brett
patent: 4995357 (1991-02-01), Gonnering et al.
patent: 5070832 (1991-12-01), Hapka et al.
Moran M. J.
Rivell John
Thermo King Corporation
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