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A power system includes a prime mover, a transmission, and a fluid coupler having a selectively engageable lockup clutch. The fluid coupler may be drivingly connected between the prime mover and the transmission. Additionally, the power system may include a motor/generator drivingly connected to at

A power system includes a prime mover, a transmission, and a fluid coupler having a selectively engageable lockup clutch. The fluid coupler may be drivingly connected between the prime mover and the transmission. Additionally, the power system may include a motor/generator drivingly connected to at least one of the prime mover and the transmission. The power-system may also include power-system controls configured to execute a control method. The control method may include selecting one of a plurality of modes of operation of the power system. Additionally, the control method may include controlling the operating state of the lockup clutch dependent upon the mode of operation selected. The control method may also include controlling the operating state of the motor/generator dependent upon the mode of operation selected.

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What is claimed is: 1. A power system of a mobile machine, including: a prime mover; a transmission; a fluid coupler having a selectively-engageable lockup clutch, the fluid coupler being drivingly connected between the prime mover and the transmission; a motor/generator drivingly connected to at l

What is claimed is: 1. A power system of a mobile machine, including: a prime mover; a transmission; a fluid coupler having a selectively-engageable lockup clutch, the fluid coupler being drivingly connected between the prime mover and the transmission; a motor/generator drivingly connected to at least one of the prime mover and the transmission; power-system controls configured to execute a control method, the control method including selecting one of a plurality of modes of operation of the power system; controlling the operating state of the lockup clutch dependent upon the mode of operation selected; controlling the operating state of the motor/generator dependent upon the mode of operation selected; wherein controlling the operating state of the lockup clutch dependent upon the mode of operation selected includes referencing a database that includes data relating to the preferred operating state of the lockup clutch for each mode of operation of the power system; and wherein controlling the operating state of the motor/generator dependent upon the mode of operation selected includes referencing a database that includes data relating to the preferred operating state of the motor/generator for each mode of operation of the power system. 2. The power system of claim 1, wherein referencing a database that includes data relating to the preferred operating state of the lockup clutch for each mode of operation of the power system and referencing a database that includes data relating to the preferred operating state of the motor/generator for each mode of operation of the power system include referencing one database that includes data relating to the preferred operating states of the lockup clutch and the motor/generator for each mode of operation of the power system. 3. The power system of claim 1, wherein the control method further includes controlling the operating state of the transmission dependent upon the mode of operation selected. 4. The power system of claim 1, wherein: the motor/generator is drivingly connected to a rotary input member of the transmission; the fluid coupler is drivingly connected between the motor/generator and the prime mover; one of the plurality of modes of operation is a prime-mover-starting mode of operation; and when the prime-mover-starting mode of operation is selected controlling the operating state of the selectively engageable lockup clutch includes causing the lockup clutch to be engaged, and controlling the operating state of the motor/generator includes causing the motor/generator to motor. 5. The power system of claim 4, wherein: one of the plurality of modes of operation is an electric-propulsion mode of operation; when the electric-propulsion mode of operation is selected, controlling the operating state of the motor/generator includes causing the motor/generator to motor; and the control method further includes causing the transmission to have a power-transmitting operating state when the electric-propulsion mode of operation is selected. 6. The power system of claim 5, wherein: one of the plurality of modes of operation is an electricity-generating mode of operation; and when the electricity-generating mode of operation is selected, controlling the operating state of the motor/generator includes causing the motor/generator to generate electricity. 7. The power system of claim 5, wherein: the transmission further includes a power-takeoff device that is continuously or may be selectively drivingly connected to a rotary input member of the transmission; one of the plurality of modes of operation is an electric power-takeoff mode of operation for driving the power-takeoff device at least partially with power from the motor/generator when the power-takeoff device is drivingly connected to the rotary input member of the transmission; and when the electric power-takeoff mode of operation is selected, controlling the operating mode of the motor/generator includes causing the motor/generator to motor. 8. The power system of claim 7, wherein the control method further includes causing the transmission to have a non-power-transmitting operating state when the electric power-takeoff mode of operation is selected. 9. The power system of claim 1, wherein at least one of the plurality of available operating modes includes simultaneously operating the motor/generator to provide power to propel the mobile machine and operating the prime mover to provide power to propel the mobile machine. 10. A method of operating a power system of a mobile machine, the power system having a prime mover, a transmission, a fluid coupler having a selectively-engageable lockup clutch and being drivingly connected between the prime mover and the transmission, and a motor/generator drivingly connected to at least one of the prime mover and the transmission, the method of operating the power system of the mobile machine including: receiving one or more inputs relating to conditions of operation of the power system; dependent upon the one or more inputs relating to conditions of operation of the power system, selecting one of a plurality of modes of operation of the power system; controlling the operating state of the lockup clutch dependent upon which mode of operation has been selected; controlling the operating state of the motor/generator dependent upon which mode of operation has been selected; and controlling the operating state of the prime mover dependent upon the mode of operation selected. 11. The method of claim 10, wherein: the motor/generator is drivingly connected to a rotary input member of the transmission; the fluid coupler is drivingly connected between the motor/generator and the prime mover; one of the plurality of modes of operation of the power system is a prime-mover-starting mode of operation for driving the prime mover when it is not operating under its own power; and when the prime-mover-starting mode of operation is selected controlling the operating state of the lockup clutch includes causing the lockup clutch to be engaged, and controlling the operating state of the motor/generator includes causing the motor/generator to motor. 12. The method of claim 11, wherein: one of the plurality of modes of operation is an electric-propulsion mode of operation for propelling the mobile machine at least partially with power from the motor/generator; when the electric-propulsion mode of operation is selected, controlling the operating state of the motor/generator includes causing the motor/generator to motor; and the control method further includes causing the transmission to have a power-transmitting operating state when the electric-propulsion mode of operation is selected. 13. The method of claim 12, wherein: one of the plurality of modes of operation is an electricity-generating mode of operation; and when the electricity generation mode of operation is selected, controlling the operating state of the motor/generator includes causing the motor/generator to generate electricity. 14. The method of claim 10, wherein: the motor/generator is drivingly connected to a rotary input member of the transmission; one of the plurality of modes of operation is a retarder mode of operation for decelerating the mobile machine; the control method further includes controlling the operating state of the transmission dependent upon the mode of operation selected, including causing the transmission to have a power-transmitting operating state when the retarder mode of operation has been selected; and when the retarder mode of operation has been selected, controlling the operating state of the motor/generator includes causing the motor/generator to motor in a direction opposite a direction in which the rotary input member of the transmission is driving the motor/generator. 15. The method of claim 10, wherein: the transmission includes a rotary input member and a power-takeoff device that is drivingly connected to the rotary input member of the transmission; one of the plurality of modes of operation is an electric power-takeoff mode of operation for driving the power-takeoff device at least partially with power from the motor/generator; the control method further includes causing the transmission to have a non-power-transmitting operating state when the electric power-takeoff mode of operation is selected; and when the electric power-takeoff mode of operation is selected, controlling the operating state of the motor/generator includes causing the motor/generator to motor. 16. The method of claim 10, wherein: controlling the operating state of the lockup clutch dependent upon the mode of operation selected includes referencing a database that includes data relating to the preferred operating state of the lockup clutch for each mode of operation; and controlling the operating state of the motor/generator dependent upon the mode of operation selected includes referencing a database that includes data relating to the preferred operating state of the motor/generator for each mode of operation of the power system. 17. The method of claim 10, wherein: controlling the operating state of the lockup clutch and controlling the operating state of the motor/generator include referencing a database that includes data relating to the preferred operating states of the lockup clutch and the motor/generator for each mode of operation of the power system. 18. The method of claim 10, further including controlling the operating state of the transmission dependent upon the mode of operation selected. 19. The method of claim 18, further including controlling the operating state of the prime mover dependent upon the mode of operation selected. 20. A mobile machine, including: a prime mover having a rotary output member; a transmission having a rotary input member and a rotary output member; a motor/generator having a rotor drivingly connected to the rotary input member of the transmission; a fluid coupler having a selectively engageable lockup clutch, the fluid coupler being connected between the rotor of the motor/generator and the rotary output member of the prime mover; and one or more propulsion devices drivingly connected to the rotary output member of the transmission. 21. The mobile machine of claim 20, further including: power-system controls configured to execute a control method, the control method including when the prime mover is not operating under its own power, selectively operating the power system in a prime-mover-starting mode, wherein the lockup clutch is engaged and the motor/generator motors to drive the prime mover. 22. The mobile machine of claim 21, wherein: the prime-mover-starting mode is a first prime-mover-starting mode; the control method further includes selectively operating the power system in a second prime-mover-starting mode, wherein the prime mover is not operating under its own power, the mobile machine is in motion, the transmission has a power-transmitting operating state, and the lockup clutch is engaged, such that momentum of the mobile machine drives the prime mover. 23. The mobile machine of claim 21, wherein the control method further includes selectively operating the power system in an electric-propulsion mode, wherein the transmission has a power-transmitting operating state and the motor/generator motors to drive the rotary input member of the transmission. 24. The mobile machine of claim 23, wherein the electric-propulsion mode is a pure electric-propulsion mode wherein the prime mover is inactive and the lockup clutch is disengaged. 25. The mobile machine of claim 23, wherein the electric-propulsion mode is a hybrid electric-propulsion mode wherein the prime mover assists the motor/generator in driving the rotary input member of the transmission. 26. The mobile machine of claim 23, wherein the control method further includes selectively operating the power system in an electricity-generating mode wherein the motor/generator generates electricity. 27. The mobile machine of claim 26, wherein the electricity-generating mode further includes the prime mover providing power to the rotor of the motor/generator through the fluid coupler. 28. The mobile machine of claim 26, wherein the electricity-generating mode further includes the transmission having a power-transmitting operating state while the mobile machine is in motion, such that momentum of the mobile machine drives the rotor of the motor/generator. 29. The mobile machine of claim 20, wherein: the transmission further includes a power-takeoff device; and the power system further includes power-system controls configured to selectively operate the power system in an electric power-takeoff mode, wherein the motor/generator drives the rotary input member of the transmission while the power-takeoff device is drivingly connected to the rotary input member of the transmission. 30. The mobile machine of claim 20, further including power-system controls configured to selectively operate the power system in a retarder mode, wherein the transmission has a power-transmitting operating state while the mobile machine is in motion and the motor/generator motors in a direction opposite which the rotary input member of the transmission is driving the rotor of the motor/generator. 31. The mobile machine of claim 20, further including a controller that controls the operating states of both the motor/generator and the lockup clutch. 32. The mobile machine of claim 31, wherein the controller also controls the operating state of the transmission. 33. The mobile machine of claim 31, wherein the controller controls the operating state of the motor/generator and the operating state of the lockup clutch by selecting a mode of operation of the power system and referencing a database that includes data relating to the preferred operating state of the motor/generator and the lockup clutch for each mode of operation of the power system.