Systems and methods for controlling stop/start events for a hybrid electric vehicle

Methods and systems are provided for controlling engine operation in a hybrid electric vehicle equipped with stop/start capabilities under conditions where requested power or torque is in a hysteresis region between an engine pull up threshold and an engine pull down threshold. In one example, a met...

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Bibliographic Details
Main Authors Lee, Minku, Bolthouse, Alec
Format Patent
LanguageEnglish
Published 15.03.2022
Subjects
BLASTING
COMBUSTION ENGINES
CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION
CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT
TRANSPORTING
VEHICLES IN GENERAL
WEAPONS
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Summary:Methods and systems are provided for controlling engine operation in a hybrid electric vehicle equipped with stop/start capabilities under conditions where requested power or torque is in a hysteresis region between an engine pull up threshold and an engine pull down threshold. In one example, a method comprises obtaining an adjusted engine pull down threshold upon the requested power or torque remaining in the hysteresis region for more than a threshold duration, and commanding the engine deactivated in response to the adjusted engine pull down threshold being equivalent to the requested power or torque. In this way, a motor/generator may be used to meet the requested torque response rather than the engine under such conditions, which may improve fuel economy.
Bibliography:Application Number: US201916381793