Patent ID: 11967854
Assignee: CUMMINS INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  F  Y | IPC B  H

Claim 12:
13. A method for controlling an engine in a mild-hybrid system, comprising:
sensing a voltage of an ultracapacitor;
responding to the voltage being approximately zero by closing a battery pre-charge switch of a passive battery pre-charge circuit connected between a terminal of a battery and a DC bus coupled to an engine starter to pre-charge the DC bus;
after pre-charging the DC bus, activating the engine starter to start the engine; and
after activating the engine starter, closing an ultracapacitor pre-charge switch of a passive ultracapacitor pre-charge circuit connected between a terminal of the ultracapacitor and the DC bus to charge the ultracapacitor.