Transmission mounted electrical charging system with dual mode load and engine off motive load power
A system includes a PTO device that selectively couples to a driveline of a vehicle, a motor/generator electrically coupled to an electrical power storage system, and a shared load selectively powered by one of the driveline or the motor/generator. The PTO device further includes a coupling actuator that couples the shared load to the motor/generator at a first selected ratio in a first position, and couples the shared load to the driveline at a second selected ratio in a second position.
1. A method, comprising:
operating a PTO device to selectively couple a shared load with one of a driveline and a motor/generator;
powering the motor/generator with a battery pack comprising a plurality of battery cell packs in a series configuration;
determining a plurality of states of charge, each state of charge corresponding to one battery cell pack of the plurality of battery cell packs;
leveling the plurality of states of charge between the plurality of battery cell packs within the battery pack in response to the plurality of states of charge;
determining a current vehicle operating mode; and
coupling the motor/generator to the driveline in response to the current vehicle operating mode.
2. The method of claim 1 , wherein the leveling comprises resistively discharging one higher charged battery cell pack of the plurality of battery cell packs in response to the plurality of states of charge.
3. The method of claim 1 , wherein the leveling comprises transferring power from the battery pack to a useful load including selectively coupling one higher charged battery cell pack of the plurality of battery cell packs to the useful load and discharging power from the one higher charged battery cell pack of the plurality of battery cell packs to the useful load.
4. The method of claim 3 , further comprising processing a discharge power from the higher charged battery cell pack of the battery pack through power electronics to configure the discharge power to an electrical power format for the useful load.
5. The method of claim 1 , further comprising performing a service operation to replace at least a portion of the battery pack at 18 months of service, and wherein the battery pack comprises eight nominal 12V battery cell packs, coupled into two parallel packs of four series batteries, and wherein the service operation comprises replacing one of the two parallel packs of batteries.
6. The method of claim 1 , further comprising performing a service operation to replace at least a portion of the battery pack at 24 months of service.
7. The method of claim 6 , wherein the battery pack comprises eight nominal 12V battery cell packs, coupled into two parallel packs of four series batteries, and wherein the service operation comprises replacing one of the two parallel packs of batteries.
8. The method of claim 1 , wherein the vehicle operating mode is a crank mode, a creep mode, or a motive mode.
9. The method of claim 1 , further comprising:
coupling the motor/generator to the driveline at a first gear ratio in response to the first current vehicle operating mode; and
coupling the motor/generator to the driveline at a second gear ratio in response to a second current vehicle operating mode.
10. The method of claim 9 , wherein:
the first current vehicle operating mode is a motive mode, and
the second current vehicle operating mode is a creep mode or a crank mode.
11. The method of claim 9 , wherein the first gear ratio is distinct from the second gear ratio.
12. The method of claim 1 , further comprising:
determining a state of charge of the battery pack,
wherein the coupling the motor/generator to the driveline is further in response to the state of charge of the battery pack.