Auxiliary power system for an agricultural baler with flywheel start up

1. An agricultural baler, comprising:

a main bale chamber;

a plunger reciprocally movable within the main bale chamber during a compression stroke and a return stroke;

a flywheel associated with the plunger;

a driveline associated with the flywheel and couplable with a power take-off (PTO) of a traction unit;

an auxiliary power system (APS) coupled with the driveline and configured for receiving power from the driveline, storing the power, and transmitting the stored power back to the driveline; and

an electrical processing circuit coupled with the APS, said electrical processing circuit being operable to control operation of the APS to rotate the flywheel upon start up of the baler.

2. The agricultural baler of claim 1 , wherein the APS starts the rotation of the flywheel concurrently with or prior to an engagement of the PTO.

3. The agricultural baler of claim 2 , wherein the APS starts the rotation of the flywheel prior to an engagement of the PTO, and the PTO is engaged when the driveline reaches a predetermined rotational speed.

4. The agricultural baler of claim 1 , wherein the power storage device is in a charged state at start up of the baler, and the electrical processing circuit is operable to engage the APS with the driveline and use the energy stored in the power storage device to start rotation of the flywheel.

5. The agricultural baler of claim 1 , wherein the power storage device is in a discharged or partially discharged state at start up of the baler, and the electrical processing circuit is operable to charge the power storage device prior to engagement of the PTO.

6. The agricultural baler of claim 1 , further including a PTO indicator providing an output signal representing an engagement of the PTO, and wherein the electrical processing circuit is operable to start rotation of the flywheel, dependent on the output signal from the PTO indicator.

7. The agricultural baler of claim 6 , wherein the PTO indicator includes at least one of:

an operator depressible switch;

a rotation speed sensor for the driveline; and

a load sensor on the driveline.

8. The agricultural baler of claim 6 , wherein the APS includes a power storage device and a charge state sensor providing an output signal representing a charge state of the power storage device, and wherein the electrical processing circuit is operable to start rotation of the flywheel, dependent on the output signals from each of the PTO indicator and the charge state sensor.

9. The agricultural baler of claim 6 , wherein the APS includes a power storage device, and the electrical processing circuit engages the APS to charge the power storage device, after receiving the output signal.

10. The agricultural baler of claim 9 , wherein the power storage device includes at least one of:

at least one hydraulic accumulator; and

an additional flywheel.

11. The agricultural baler of claim 10 , wherein the APS includes a hydraulic pump/motor for charging the power storage device.

12. The agricultural baler of claim 9 , wherein the power storage device includes at least one of:

at least one capacitor; and

at least one battery.

13. The agricultural baler of claim 12 , wherein the APS includes an electric motor/generator for charging the power storage device.

14. A method of operating an agricultural baler, the baler including a main bale chamber, a plunger reciprocally movable within the main bale chamber during a compression stroke and a return stroke, a flywheel associated with the plunger, and a driveline associated with the flywheel and couplable with a power take-off (PTO) of a traction unit, the method comprising the steps of:

receiving power from the driveline at an auxiliary power system (APS);

storing the received power within the APS;

transmitting the stored power from the APS back to the driveline; and

rotating the flywheel using the APS upon start-up of the baler.

15. The method of claim 14 , wherein the rotating step includes the sub-steps of:

starting the rotation of the flywheel prior to an engagement of the PTO; and

engaging the PTO when the driveline reaches a predetermined rotational speed.