Method for restarting engine in hybrid electric powertrain

A technology of hybrid power and engine, which is applied in the field of powertrain, and can solve problems such as disturbance, excessive energy consumption, and excessive power consumption
CN102019923AActive Publication Date: 2011-04-20FORD GLOBAL TECH LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FORD GLOBAL TECH LLC
Publication Date
2011-04-20

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Abstract

A method for restarting an engine in a hybrid electric powertrain includes using an auxiliary pump while the engine is shutdown to maintain stroke pressure in an oncoming transmission friction control element whose engagement is required to launch the vehicle following the restart, initiating an automatic engine restart, increasing a torque capacity of the control element while the engine is restarting, and using pressure produced by a transmission pump in the transmission to lock the control element after the engine restarts.
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Description

technical field

[0001] The present invention relates generally to the powertrain of a hybrid electric vehicle (HEV), and more particularly to its control during engine restart times. Background technique

[0002] A hybrid electric vehicle (HEV) is a vehicle configured with a hybrid drive system that utilizes at least two different sources of torque to propel the vehicle. As a non-limiting example, a hybrid drive system may combine a conventional drive system including a multi-speed automatic transmission and an internal combustion engine with one or more electric motors and a rechargeable energy storage device (such as a battery) capable of driving the electric motors or storing energy Combined with an advanced electric drive system, it improves fuel economy over conventional vehicles. Hybrid electric vehicles typically offer different powertrain operating modes with the engine on or off depending on vehicle operating conditions, battery condition, and driver drive requirem...

Claims

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