Method of operating a transport refrigeration unit

Details Method of operating a transport refrigeration unit Method of operating a transport refrigeration unit

1991-07-11

1993-04-13

Rivell, John

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62129, 62230, 623231, 123198D, F25B 4900

Patent

active

052011860

ABSTRACT:
A method of detecting conditions during the operation of a transport refrigeration unit 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 driven by an engine operable at low and high speeds. Upon detecting an over-temperature condition of the engine a first modification is initiated, including switching the engine to low speed. If the engine temperature does not drop to a safe value, a second modification is initiated. If the engine was in low speed when the over-temperature condition was detected, the second modification is initiated immediately. Upon detecting a low oil pressure condition, the engine is switched to high speed. If the oil pressure rises to a safe level, engine operation is continued at high speed. Appropriate alarms accompany the modified operating conditions.

REFERENCES:
patent: 3904885 (1975-09-01), Hollins
patent: 4071839 (1978-01-01), Hollins
patent: 4324286 (1982-04-01), Brett
patent: 4642770 (1987-02-01), Shirley
patent: 4663725 (1987-05-01), Truckenbrod et al.
patent: 4914924 (1990-04-01), Takahashi
patent: 4918932 (1990-04-01), Gustafson et al.

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