DIRECT DRIVE PARALLEL POWER SYSTEM

1 . A direct drive parallel power system for powering a transport climate control system, the direct drive parallel power system comprising:

a powertrain that includes a prime mover, a motor-generator, and a drive shaft, wherein the prime mover is configured to generate mechanical power for powering a direct driven load of the transport climate control system via the drive shaft, wherein the motor-generator includes a motor and a generator, and wherein the motor is configured to generate mechanical power for powering the direct driven load via the drive shaft;

a battery source electrically connected to the generator of the motor-generator, wherein the battery source is configured to supply electrical power to the motor of the motor-generator and configured to supply electrical power to an electrically driven load of the transport climate control system; and

a power system controller configured to monitor and control operation of the prime mover, the motor-generator, and the battery source.

2 . The direct drive parallel power system of claim 1 , wherein the powertrain further includes a clutch disposed between the prime mover and the motor-generator along the drive shaft, wherein the clutch is controlled via the power system controller and wherein the clutch is configured to engage and disengage the prime mover from the drive shaft based on instructions received from the power system controller.

3 . The direct drive parallel power system of claim 1 , further comprising a battery charger configured to connect to a utility power source for charging the battery source.

4 . The direct drive parallel power system of claim 1 , wherein the generator of the motor-generator is configured to convert mechanical power generated by the prime mover into electrical power and is configured to transfer the generated electrical power to the battery source for charging the battery source.

5 . The direct drive parallel power system of claim 1 , wherein the power system controller is configured to operate the direct drive parallel power system in a parallel operation mode in which both the prime mover and the motor-generator are instructed to concurrently supply mechanical power via the drive shaft to the direct driven load.

6 . The direct drive parallel power system of claim 1 , wherein the power system controller is configured to operate the direct drive parallel power system in a prime mover operation mode in which the prime mover is instructed to supply mechanical power via the drive shaft to the direct driven load without assistance from the motor-generator.

7 . The direct drive parallel power system of claim 1 , wherein the power system controller is configured to operate the direct drive parallel power system in a motor-generator operation mode in which the motor-generator is instructed to supply mechanical power via the drive shaft to the direct driven load without assistance from the prime mover.

8 . The direct drive parallel power system of claim 1 , wherein the prime mover is one of: a diesel engine, a gasoline engine, a compressed natural gas (CNG) engine, and a liquid nitrogen gas (LNG) engine.

9 . The direct drive parallel power system of claim 1 , wherein the direct driven load is a working fluid compressor of the transport climate control system.

10 . A method for operating a direct drive parallel power system to power a transport climate control system, the method comprising:

monitoring a prime mover parameter;

comparing the monitored prime mover parameter to a prime mover threshold;

when the monitored prime mover parameter is less than the prime mover threshold, operating the direct drive parallel power system in a parallel operation mode to power a direct driven load of the transport climate control system, and

when the monitored prime mover parameter is not less than the prime mover threshold, operating the direct drive parallel power system in a prime mover operation mode to power the direct driven load.

11 . The method of claim 10 , wherein operating the direct drive parallel power system in the parallel operation mode includes:

a prime mover of the direct drive parallel power system generating mechanical power; and

a drive shaft of the direct drive parallel power system transferring the generated mechanical power from the prime mover to the direct driven load.

12 . The method of claim 10 , wherein operating the direct drive parallel power system in the prime mover operation mode includes:

a prime mover of the direct drive parallel power system generating mechanical power;

a motor-generator of the direct drive parallel power system generating mechanical power; and

a drive shaft of the direct drive parallel power system concurrently transferring the generated mechanical power from the prime mover and the generated mechanical power from the motor-generator to the direct driven load.

13 . The method of claim 10 , further comprising:

determining whether a battery source of the direct drive parallel power system is sufficiently charged when the monitored prime mover parameter is not less than the prime mover threshold;

when the battery source is sufficiently charged, operating the direct drive parallel power system in a motor-generator operation mode; and

when the battery source is not sufficiently charged, operating the direct drive parallel power system in the prime mover operation mode.

14 . The method of claim 13 , wherein operating the direct drive parallel power system in the motor-generator operation mode includes:

a motor-generator of the direct drive parallel power system generating mechanical power; and

a drive shaft of the direct drive parallel power system transferring the generated mechanical power from the motor-generator to the direct driven load.

15 . The method of claim 10 , further comprising a battery source of the direct drive parallel power system supplying electrical power to an electrically driven load of the transport climate control system.