METHOD AND SYSTEM FOR CONTROLLING CATALYST TEMPERATURE

摘要

A method and a system for improving operation of a hybrid vehicle are presented. In one example, an engine exhaust after treatment device is cooled at an opportunistic time. The approach may provide improved cooling for exhaust after treatment devices and it may also improve vehicle emissions.

主权项

1. A method for operating a hybrid powertrain, comprising:
opening a disconnect clutch between and engine and transmission to opearate an engine at a speed that is asynchronous to a starter/generator while limiting a temperature that an exhaust after treatment device reaches via an action in response to a desired torque being less than a threshold torque and an after treatment device temperature.