Abstract: A system and method for monitoring and controlling an electrically driven transport refrigeration unit under varying operating conditions while maintain the system generator within its electric current and temperature limitations is disclosed. Specifically, the present invention the management of generator power through the combined use of controls for a suction modulation valve (an “SMV”), for diesel engine speed control, and for electronic expansion valve (“EXV”) superheat settings.

Abstract: A system and method for monitoring and controlling an electrically driven transport refrigeration unit under varying operating conditions while maintain the system generator within its electric current and temperature limitations is disclosed. Specifically, the present invention the management of generator power through the combined use of controls for a suction modulation valve (an “SMV”), for diesel engine speed control, and for electronic expansion valve (“EXV”) superheat settings.

Abstract: A system and method for monitoring and controlling an electrically driven transport refrigeration unit under varying operating conditions while maintain the system generator within its electric current and temperature limitations is disclosed. Specifically, the present invention the management of generator power through the combined use of controls for a suction modulation valve (an “SMV”), for diesel engine speed control, and for electronic expansion valve (“EXV”) superheat settings.

Abstract: A process and method for monitoring and selectively controlling the capacity and operating conditions of a refrigeration unit is disclosed. Specifically, the present invention includes the adjustment of the electronic expansion valve, and the compressor cylinder banks through the adjustment of desired superheat levels in order to bring a transport refrigeration unit within desired operating conditions.

Abstract: A process and method for monitoring and selectively controlling the capacity and power demand within a transport unit is disclosed. Specifically, the present invention teaches the combined controls of an electronic suction modulation valve, and electronic expansion valve, and/or an electronic hot gas valve in communication with a microcontroller and a number of sensors in order to monitor and control power consumption and capacity, preferably without the use or presence of compressor unloaders, mechanical throttling devices, or other mechanical power control devices.

Abstract: An process and method for monitoring and selectively controlling the discharge and suction pressures of a compressor within a transport unit is disclosed. Specifically, the present invention teaches the adjustment of the suction modulation valve, the compressor cylinder banks, and the engine speed solenoid in order to bring the operating compressor discharge and suction pressures within the design operating envelope.

Abstract: An process and method for monitoring and limiting high voltage conditions in a transport refrigeration unit is disclosed. The system provides a microprocessor control which monitors the load, generator temperature and engine speed and compares it to an algorithm or map programmed into a controller for the unit. The map or algorithm preferably predicts voltage based upon load (amperage), generator temperature and engine speed. If the result of the monitored features predicts a voltage above preselected acceptable levels which are programmed into the controller, then the controller will drop the engine into low speed.

Abstract: A system and method for monitoring and controlling an electrically driven transport refrigeration unit under varying operating conditions while maintain the system generator within its electric current and temperature limitations is disclosed. Specifically, the present invention the management of generator power through the combined use of controls for a suction modulation valve (an “SMV”), for diesel engine speed control, and for electronic expansion valve (“EXV”) superheat settings.

Abstract: An system and method for monitoring and limiting high power and overheating engine conditions in a transport refrigeration unit is disclosed. The system provides a microprocessor control which monitor the engine coolant temperature to determine whether it exceeds a predetermined limit. If the engine coolant temperature exceeds that limit, the control sends a control signal which restricts or closes the suction modulation valve of the transport refrigeration system, restricting the mass flow rate of the system and thereby reducing the power draw on the engine. The system further provides a continued monitoring process for further restricting or closing the suction modulation valve in the event of continued high engine coolant temperatures, and for gradually opening the suction modulation valve and increasing the maximum current draw on the engine once the engine coolant temperature sinks below its predetermined limit.

Abstract: An system and process for controlling an electronic exchange valve for an transport refrigeration system evaporator in the absence of a evaporator outlet pressure transducer reading is disclosed. The process includes monitoring for the absence of reliable evaporator outlet pressure readings, monitoring the supply air temperature, and supplying the supply air temperature to a processor within a controller for use in an algorithm so as to approximate the saturation reference temperature and superheat levels to derive the necessary control signals for the EXV.

Abstract: A system and process for optimizing the power drawn on a transport refrigeration system under power limitation conditions is disclosed. The invention includes a microprocessor control which adjusts the desired superheat level for the system, thereby altering the expansion valve, thereby limiting the mass flow rate of refrigerant through the system without having a comparable drop in refrigeration capacity as would a similar actuation of the suction modulation valve.

Abstract: An process and method for monitoring and selectively implementing an operator selected economy mode in a transport refrigeration system is disclosed. The system includes a microprocessor control which, in response to operator selection of the economy mode, increases the base superheat setting, lowers the engine speed, limits the system current, and reduces the compressor capacity in order to optimize the fuel consumption of the system. The controller further monitors for the presence of an out of range alarm, and issues override commands reversing the superheat, compressor, current limit and engine speed economy mode settings at least until the out of range condition no longer exists.