METHODS AND SYSTEM FOR CREEP TORQUE AND TIP IN CONTROL FOR VEHICLES WITH AUTOMATIC TRANSMISSIONS

Methods and systems are provided for controlling a distribution between engine and motor torques for a hybrid electric vehicle operating in a creep mode of operation in response to an engine start request. In one example, responsive to a request to start an engine while a vehicle is being propelled...

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Bibliographische Detailangaben
Hauptverfasser: Johri, Rajit, Zhao, Yanan, Doering, Jeffrey Allen, Meyer, Jason
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:Methods and systems are provided for controlling a distribution between engine and motor torques for a hybrid electric vehicle operating in a creep mode of operation in response to an engine start request. In one example, responsive to a request to start an engine while a vehicle is being propelled at a predetermined wheel creep torque via an electric motor positioned downstream of a transmission and a torque converter, coordinating an electric motor torque and an engine torque in one of a first mode, second mode, or a third mode depending on whether the electric motor can continue to provide the predetermined wheel creep torque. In this way, engine idle speed may be minimized depending on vehicle operating conditions, which may improve fuel economy.