Hybrid energy management system
AssigneeCaterpillar Inc.
InventorsBenjamin A. Treichel, David L. Collins, Stephen Eric Post
Life of this patent
Estimating the term…
Abstract
A hybrid energy management system that estimates the net regenerative energy that can be collected during the breaking action of the swing mechanism, then, since this is the net energy that can be used to recharge an energy storage device without using the engine to help recharge the energy storage device, the system limits the use of the energy storage device to that net amount predicted to be available from the recovery period. The net regenerative energy is calculated by considering motor and inverter efficiencies for transferring energy to the battery and changes in the boom/stick/bucket inertia moment.
Claims14
A machine having a body, a chassis, and an engine comprising:
- a swing mechanism that rotates the body relative to the chassis about an axis;
- an electric motor/generator in electrical communication with the swing mechanism;
- an energy storage device in electrical communication with the swing mechanism;
- and
- an energy management system configured to determine a transition from a discharge period to a recovery period and responsively:
- estimate the net energy generated by the swing mechanism during the recovery period;
- limit the energy available for use from the energy storage device during the discharge period to the estimated net energy generated from the swing mechanism;
- and
- recharge the battery from the actual net energy generated during the recovery period.
Dependencies are inferred from the claim text.