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1. (WO2013119663) MAIN PUMP TO AUXILIARY PUMP HAND-OFF STRATEGY IN HYBRID ELECTRIC VEHICLE

Pub. No.:    WO/2013/119663    International Application No.:    PCT/US2013/024930
Publication Date: Fri Aug 16 01:59:59 CEST 2013 International Filing Date: Thu Feb 07 00:59:59 CET 2013
IPC: B60W 20/00
B60W 30/192
F16H 61/00
Applicants: CHRYSLER GROUP LLC
Inventors: IVACKO, Joseph
KEDAR-DONGARKAR, Gurunath
Title: MAIN PUMP TO AUXILIARY PUMP HAND-OFF STRATEGY IN HYBRID ELECTRIC VEHICLE
Abstract:
The invention relates to a method and auxiliary pump system for reducing an occurrence of hydraulic pressurization loss during the transition from gas-powered engine (120) operation to electric motor operation in a hybrid electric vehicle. The method includes maintaining operation of the gas-powered engine (120) while initiating an auxiliary pump (128) with its associated electric motor (125). A master timer is initiated. Once the speed of the auxiliary pump (128) exceeds a minimum speed threshold, a delay time period is determined during which operation of the auxiliary pump is tested. If the auxiliary pump (128) does not stall during the delay time period and the master timer has not yet expired, the gas-powered engine (120) is allowed to shut-off.