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1. (WO2018057310) SELECTIVE RESPONSE CONTROL OF DC-DC CONVERTERS IN MILD HYBRID ELECTRIC VEHICLES AT HIGH VOLTAGE FAILURE

Pub. No.:    WO/2018/057310    International Application No.:    PCT/US2017/050596
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Sat Sep 09 01:59:59 CEST 2017
IPC: B60K 6/485
B60W 20/50
B60W 50/029
Applicants: FCA US LLC
Inventors: KASHYAP, Amshumaan R.
MARUNENI, Sricharan
GROSS, Oliver
Title: SELECTIVE RESPONSE CONTROL OF DC-DC CONVERTERS IN MILD HYBRID ELECTRIC VEHICLES AT HIGH VOLTAGE FAILURE
Abstract:
A control system for a mild hybrid vehicle is configured to detect whether a main contactor is open, the main contactor being connected between a primary battery system and a bi-directional direct current to direct current (DC-DC) converter and in response to detecting that the main contactor is open: command the DC-DC converter to operate in a boost mode to excite a motor-generator unit (MGU), after the excitation of the MGU has completed, command the DC-DC converter to operate in a buck mode, determine a previous voltage regulation feedback setpoint for the DC-DC converter, and control the DC-DC converter to maintain a voltage of the secondary battery system within a desired range by inserting a delay to a voltage control loop of the DC-DC converter such that the voltage control loop mimics a bandwidth of the MGU.