Accessory drive motor configuration

1. A system, comprising:

an internal combustion engine having a crankshaft extending from a rear of the engine, the crankshaft mechanically coupled to a load;

a controller including a power source selection module structured to select one of the internal combustion engine and an electro-mechanical device to provide torque to a shaft;

wherein the shaft is operably coupled to an accessory drive system at a front of the engine to transfer torque thereto; and

wherein the shaft extends through a stator of the electro-mechanical device and is operably connected to the crankshaft at the rear of the engine and the accessory drive system at the front of the engine.

2. The system of claim 1 , wherein the internal combustion engine is a diesel engine.

3. The system of claim 1 , wherein the accessory drive system includes at least one accessory selected from the group of accessories consisting of a pump, a fan, and a compressor.

4. The system of claim 1 , further comprising a clutch between the internal combustion engine and the electro-mechanical device.

5. The system of claim 1 , wherein the electro-mechanical device is a motor/generator electrically coupled to an electrical energy storage device.

6. The system of claim 5 , wherein the electrical energy storage device includes an electrical energy storage device selected from the group of electrical energy storage devices consisting of a nickel metal hydride battery, a lithium-ion battery, and a fuel cell.

7. The system of claim 5 , wherein the internal combustion engine, the motor/generator, and the electrical energy storage device are operably coupled in a parallel hybrid configuration.

8. The system of claim 1 , wherein the electro-mechanical device is selectively engaged to the crankshaft.

9. The system of claim 1 , further comprising:

a transmission selectively coupled to the internal combustion engine;

a traction motor selectively coupled to the transmission; and

wherein the traction motor is structured to selectively provide torque to the load.

10. The system of claim 1 , further comprising a gear assembly, wherein the gear assembly is interposed between the electro-mechanical device and the internal combustion engine.

11. The system of claim 1 , further comprising a rear accessory drive system mechanically coupled to the internal combustion engine.

12. The system of claim 11 , wherein the rear accessory drive system comprises at least one accessory selected from the group of accessories consisting of an air compressor, a refrigeration compressor, and a hydraulic pump.

13. An apparatus, comprising:

an internal combustion engine having a crankshaft extending from a rear of the engine, the crankshaft structured to provide traction power;

an accessory drive system at a front of the engine operably coupled to a shaft;

wherein the shaft is selectively coupled to an electro-mechanical device, and selectively coupled to the internal combustion engine; and

wherein the shaft extends through at least a portion of the electro-mechanical device and is operably connected to the crankshaft at the rear of the engine and the accessory drive system at the front of the engine.

14. The apparatus of claim 13 , further comprising:

an accessory power determination module structured to determine a target torque value for the accessory drive system;

a power source selection module structured to select one of the internal combustion engine and the electro-mechanical device to provide torque to the accessory drive system in response to the target torque value; and

a starting module structured to send a start command to the electro-mechanical device, and in response to the start command the electro-mechanical device engages a flywheel providing torque to the crankshaft and thereby starting the internal combustion engine.

15. The apparatus of claim 14 , wherein the power source selection module is further structured to select one of the internal combustion engine and the electro-mechanical device by sending a clutch command, the apparatus further comprising a clutch between the internal combustion engine and electro-mechanical device, wherein the clutch is responsive to the clutch command.

16. The apparatus of claim 14 , wherein the accessory power determination module is further structured to determine a rear target torque value for a rear accessory drive system, the apparatus further comprising a rear power source selection module structured to send a rear clutch command in response to the rear target torque value, the rear clutch command selecting one of the internal combustion engine and the electro-mechanical device to provide torque to the rear accessory drive system.

17. The apparatus of claim 13 , further comprising a transmission operably coupled to the internal combustion engine, and a traction motor operably coupled to the transmission, wherein the fraction motor is structured to provide traction power.

18. A system, comprising:

an internal combustion engine having a crankshaft extending from a rear of the engine, the crankshaft mechanically coupled to a load;

means for selecting one of the internal combustion engine and an electro-mechanical device to provide torque to an accessory drive system at a front of the engine; and

means for transferring torque from the internal combustion engine through the electro-mechanical device and to the accessory drive system.

19. The system of claim 18 , further comprising:

means for determining a target torque value for the accessory drive system; and

means for providing torque to the accessory drive system in response to the target torque value.

20. The system of claim 18 , further comprising means for transferring torque from the electro-mechanical device to start the internal combustion engine.

21. A method, comprising:

operating a vehicle including a hybrid drivetrain structured to provide torque to one or more accessories, the hybrid drivetrain including an internal combustion engine with one or more reciprocating pistons and an electro-mechanical device, wherein the internal combustion engine further includes a crankshaft extending from a rear of the engine coupled to a load;

in a first mode of operation, providing torque to the accessories at a front of the engine from the internal combustion engine;

wherein the providing torque to the accessories from the internal combustion engine further comprises transferring the torque from the internal combustion engine to the accessories through a shaft which extends through the electro-mechanical device and is operably connected to the crankshaft at the rear of the engine and the accessory drive system at the front of the engine; and

in a second mode of operation, providing torque to the accessories from the electro-mechanical device while the internal combustion engine is in an on state.

22. The method of claim 21 , further comprising, in a third mode of operation, providing torque to the accessories from the electro-mechanical device while the internal combustion engine is in an off state.

23. The method of claim 21 , wherein the electro-mechanical device is of a motor/generator form, wherein the method further includes generating electrical energy with the motor/generator and storing at least a portion of the generated electrical energy in an energy storage device.

24. The method of claim 21 , further comprising starting the internal combustion engine with torque from the electro-mechanical device.

25. A method, comprising:

operating a vehicle including an internal combustion engine having a crankshaft extending from a rear of the engine coupled to a load and an accessory drive system at a front of the engine selectively coupled the internal combustion engine;

determining a target torque value for the accessory drive system;

in response to the target torque value, determining to power the accessory drive system with one of the electro-mechanical device and the internal combustion engine; and

in response to determining to power the accessory drive system with the internal combustion engine:

engaging a clutch interposed between the electro-mechanical device and the internal combustion engine; and

transferring torque from the internal combustion engine to the accessory drive system through a shaft which extends through the electro-mechanical device and is operably connected to the crankshaft at the rear of the engine and the accessory drive system at the front of the engine.

26. The method of claim 25 , wherein in response to determining to power the accessory drive system with the electro-mechanical device, disengaging the clutch between the electro-mechanical device and the internal combustion engine, and providing torque to the accessory drive system from the electro-mechanical device.

27. The method of claim 25 , further comprising:

determining the internal combustion engine is in an off state;

in response to the internal combustion engine being in the off state, disengaging the clutch between the electro-mechanical device and the internal combustion engine; and

providing torque from the electro-mechanical device to power the accessory drive system.

28. The method of claim 25 , further comprising:

determining the internal combustion engine is in an off state; and

in response to the determining the internal combustion is in the off state, starting the internal combustion engine with the electro-mechanical device.