Motor Torque Based Torque Converter Slip Control During Transient Events

Abstract

The present invention provides torque converter slip control based on motor torque during a transient event. A hybrid vehicle has an engine, an electric drive motor and battery, an automatic transmission with a torque converter with a bypass clutch, and a powertrain controller that dynamically adjusts the torque converter during transient torque requests Slip to balance fuel economy and operability by using motor torque to meet the transient and feed-forward control and feedback control of slip to apply fluid pressure in the bypass clutch based on the motor torque during a transient event maintains the torque converter torque ratio substantially constant.

Description

technical field [0001] The present invention relates to controls for a hybrid vehicle including a powertrain having an engine, an electric motor with a power source, a torque converter with a bypass clutch, and a plurality of step ratio gears. An automatic transmission that is controlled by a powertrain controller that generates commands for bypass clutch fluid pressure based on motor operation to maintain target slip during transient events. Background technique [0002] In conventional engine-driven vehicles with automatic transmissions, the transmission controller manages the operation of the torque converter. The torque converter has a bypass clutch that manages torque transfer between the impeller and turbine of the torque converter. The bypass clutch can provide three modes of bypass clutch operation and torque multiplication can occur based on the amount of slip between the impeller side and the turbine side. In open mode, the torque converter housing carries the ma...

AI Technical Summary

Problems solved by technology

However, feed-forward control predicts the operation of the system based on engine torque estimates, but the difficulty of accurately estimating engine torque values ​​during, for example, tip-in events and the timing delay of the feedback circuit interferes with micro-slip control Precise control of swipes during events

Hybrid vehicles add powertrain because hybrid vehicles include monitoring and control of the engine, traction motor, or both as power sources in the powertrain, as well as monitoring and control of clutches and additional sensors and actuators system control complexity

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