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Method of operating a transport refrigeration unit

  • US 5,201,186 A
  • Filed: 07/11/1991
  • Issued: 04/13/1993
  • Est. Priority Date: 07/11/1991
  • Status: Expired due to Fees
First Claim
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1. A method of modifying the operation of a refrigeration unit when a condition is detected which may result in shutdown of the unit, with the refrigeration unit having a refrigerant compressor driven at low and high speeds by an internal combustion engine, with the engine including a temperature sensor, comprising the steps of:

  • monitoring the temperature of the engine,detecting a predetermined over-temperature condition,initiating a first modification of the refrigeration unit, including the step of switching the engine to low speed when it is in high speed at the time the detecting step detects the predetermined over-temperature condition,determining if the engine temperature has dropped below a predetermined value after the step of switching to low speed,initiating a second modification of the refrigeration unit when the engine temperature does not drop below the predetermined value,maintaining the engine at low speed when it is in low speed when the detecting step detects the predetermined over-temperature condition, andinitiating the second modification of the refrigeration unit immediately when the engine is in low speed at the time the detecting step detects the predetermined over-temperature condition.

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