Technical Paper
A Study on Overcoming Unavailable Backward Driving and a New Fail-Safe Strategy for R-Gearless (P)HEV System
2024-04-09
2024-01-2170
Recently, as part of the purpose of improving fuel efficiency and cost reduction of eco-friendly vehicles, the R-gearless system has been applied in TMED (P)HEV system It is necessary to develop a separate backward driving method as the reverse gear is removed, so backward driving can be enabled by using the e-Motor system in TMED (P)HEV system. However, backward driving with e-Motor is limited as partial failure of high-voltage system in R-gearless system Here we show that, it is possible to improve the backward driving problems by applying new fail-safe strategy. In the event of a high voltage battery system failure, the backward driving is available by using e-Motor with constant voltage control by HSG as we proposed in this paper. So feed-forward compensation of variable constant voltage control enables to secure more active output power within limited HSG output power.