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A method of operating a transport refrigeration unit that is operable to regulate a temperature of a cargo space. The method includes providing a controller, driving a refrigerant compressor of the transport refrigeration unit with an internal combustion engine to compress a refrigerant defining an

A method of operating a transport refrigeration unit that is operable to regulate a temperature of a cargo space. The method includes providing a controller, driving a refrigerant compressor of the transport refrigeration unit with an internal combustion engine to compress a refrigerant defining an engine operating state of the transport refrigeration unit, and driving the refrigerant compressor of the transport refrigeration unit with an electric motor to compress the refrigerant defining a motor operating state of the transport refrigeration unit. The method further includes sensing the temperature of the cargo space, receiving into the controller a signal indicative of the temperature of the cargo space, determining the temperature of the cargo space using the controller, and switching between the engine operating state and the motor operating state in response to a signal generated by the controller based on the temperature of the cargo space.

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1. A method of operating a transport refrigeration unit that is operable to regulate a temperature of a cargo space, the method comprising: providing a controller;driving a refrigerant compressor of the transport refrigeration unit with an internal combustion engine to compress a refrigerant definin

1. A method of operating a transport refrigeration unit that is operable to regulate a temperature of a cargo space, the method comprising: providing a controller;driving a refrigerant compressor of the transport refrigeration unit with an internal combustion engine to compress a refrigerant defining an engine operating state of the transport refrigeration unit;driving the refrigerant compressor of the transport refrigeration unit with an electric motor to compress the refrigerant defining a motor operating state of the transport refrigeration unit;sensing the temperature of the cargo space;receiving into the controller a signal indicative of the temperature of the cargo space;determining the temperature of the cargo space using the controller; andswitching from the engine operating state to the motor operating state in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to a first predetermined temperature and greater than or equal to a second predetermined temperature less than the first predetermined temperature. 2. The method of claim 1, further comprising shutting down the internal combustion engine in response to a signal generated by the controller after switching from the engine operating state to the motor operating state. 3. The method of claim 1, further comprising, driving the refrigerant compressor with the internal combustion engine to heat the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to the second predetermined temperature; anddriving the refrigerant compressor with the internal combustion engine to cool the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal to the first predetermined temperature. 4. The method of claim 3, further comprising, driving the refrigerant compressor with the electric motor to heat the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to a third predetermined temperature and greater than or equal to the second predetermined temperature; anddriving the refrigerant compressor with the electric motor to cool the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal to a fourth predetermined temperature and less than or equal to the first predetermined temperature. 5. The method of claim 1, wherein switching between the engine operating state and the motor operating state includes switching from the motor operating state to the engine operating state in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal to a predetermined temperature. 6. The method of claim 5, wherein switching from the motor operating state to the engine operating state includes starting the internal combustion engine in response to a signal generated by the controller. 7. The method of claim 1, further comprising providing a coupling to selectively drive the refrigerant compressor in at least one of the motor operating state and the engine operating state. 8. The method of claim 1, further comprising manually entering the predetermined temperature into the controller. 9. A method of operating a transport refrigeration unit that is operable to regulate a temperature of a cargo space, the method comprising: providing a controller;driving a refrigerant compressor of the transport refrigeration unit with an internal combustion engine to compress a refrigerant defining an engine operating state of the transport refrigeration unit;driving the refrigerant compressor of the transport refrigeration unit with an electric motor to compress the refrigerant defining a motor operating state of the transport refrigeration unit;sensing the temperature of the cargo space;receiving into the controller a signal indicative of the temperature of the cargo space;determining the temperature of the cargo space using the controller;switching between the engine operating state and the motor operating state in response to a signal generated by the controller based on the temperature of the cargo space;sensing whether an external electrical power source independent of the transport refrigeration unit is available to power the electric motor of the transport refrigeration unit;receiving into the controller a signal indicative of whether the external electrical power source is available to power the electric motor;determining whether the external electrical power source is available using the controller; andswitching from the motor operating state to the engine operating state in response to a signal generated by the controller when the controller determines that the external electrical power source is not available. 10. A transport refrigeration unit that is operable to regulate a temperature of a cargo space, the transport refrigeration unit comprising: a sensor configured to sense the temperature of the cargo space;a controller configured to receive a signal from the sensor indicative of the temperature and the controller configured to determine the temperature;a refrigerant compressor operable to compress a refrigerant;an internal combustion engine configured to drive the refrigerant compressor to compress the refrigerant defining an engine operating state of the transport refrigeration unit;an electric motor configured to drive the refrigerant compressor to compress the refrigerant defining a motor operating state of the transport refrigeration unit; anda coupling configured to selectively couple at least one of the internal combustion engine and the electric motor to the refrigerant compressor to drive the refrigerant compressor, wherein the controller is configured to switch from the engine operating state to the motor operating state in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to a first predetermined temperature and greater than or equal to a second predetermined temperature less than the first predetermined temperature. 11. The transport refrigeration unit of claim 10, wherein the controller is configured to shutdown the internal combustion engine in response to a signal generated by the controller after the controller switches from the engine operating state to the motor operating state. 12. The transport refrigeration unit of claim 10, wherein the controller is configured to drive the refrigerant compressor with the internal combustion engine to heat the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to the second predetermined temperature, and wherein the controller is configured to drive the refrigerant compressor with the internal combustion engine to cool the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal to the first predetermined temperature. 13. The transport refrigeration unit of claim 12, wherein the controller is configured to drive the refrigerant compressor with the electric motor to heat the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to a third predetermined temperature and greater than or equal to the second predetermined temperature, wherein the controller is configured to drive the refrigerant compressor with the electric motor to cool the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal to a fourth predetermined temperature and less than or equal to the first predetermined temperature. 14. The transport refrigeration unit of claim 10, wherein the controller is configured to switch from the motor operating state to the engine operating state in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal to a predetermined temperature. 15. The transport refrigeration unit of claim 14, wherein the controller is configured to start the internal combustion engine in response to a signal generated by the controller when the controller switches from the motor operating state to the engine operating state. 16. A transport refrigeration unit that is operable to regulate a temperature of a cargo space, the transport refrigeration unit comprising: a sensor configured to sense the temperature of the cargo space;a controller configured to receive a signal from the sensor indicative of the temperature and the controller configured to determine the temperature;a refrigerant compressor operable to compress a refrigerant;an internal combustion engine configured to drive the refrigerant compressor to compress the refrigerant defining an engine operating state of the transport refrigeration unit;an electric motor configured to drive the refrigerant compressor to compress the refrigerant defining a motor operating state of the transport refrigeration unit;a coupling configured to selectively couple at least one of the internal combustion engine and the electric motor to the refrigerant compressor to drive the refrigerant compressor, wherein the controller is configured to switch between the engine operating state and the motor operating state in response to a signal generated by the controller based on the temperature of the cargo space; anda second sensor configured to sense whether an external electrical power source independent of the transport refrigeration unit is available to power the electric motor of the transport refrigeration unit,wherein the controller is configured to receive into the controller a signal indicative of whether the external electrical power source is available to power the electric motor and the controller is configured to determine whether the external electrical power source is available, andwherein the controller is configured to switch from the motor operating state to the engine operating state in response to a signal generated by the controller when the controller determines that the external electrical power source is not available. 17. A transport refrigeration unit that is operable to regulate a temperature of a cargo space, the transport refrigeration unit comprising: a first sensor configured to sense the temperature of the cargo space;a controller configured to receive a signal from the first sensor indicative of the temperature and the controller configured to determine the temperature;a refrigerant compressor operable to compress a refrigerant;an internal combustion engine configured to drive the refrigerant compressor to compress the refrigerant defining an engine operating state of the transport refrigeration unit;an electric motor configured to drive the refrigerant compressor to compress the refrigerant defining a motor operating state of the transport refrigeration unit;a coupling configured to selectively couple at least one of the internal combustion engine and the electric motor to the refrigerant compressor to drive the refrigerant compressor;a second sensor configured to sense whether an external electrical power source independent of the transport refrigeration unit is available to power the electric motor of the transport refrigeration unit,wherein the controller is configured to switch from the engine operating state to the motor operating state to cool the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to a first predetermined temperature,wherein the controller is configured to switch from the engine operating state to the motor operating state to heat the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal to a second predetermined temperature,wherein the second predetermined temperature is less than the first predetermined temperature,wherein the controller is configured to drive the refrigerant compressor with the electric motor to heat the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is less than or equal to a third predetermined temperature and greater than or equal to the second predetermined temperature,wherein the controller is configured to drive the refrigerant compressor with the electric motor to cool the cargo space in response to a signal generated by the controller when the controller determines that the temperature of the cargo space is greater than or equal a fourth predetermined temperature and less than or equal to the first predetermined temperature,wherein the controller is configured to receive into the controller a signal indicative of whether the external electrical power source is available to power the electric motor and the controller is configured to determine whether the external electrical power source is available, andwherein the controller is configured to switch from the motor operating state to the engine operating state in response to a signal generated by the controller when the controller determines that the external electrical power source is not available.