System and method for controlling engine torque to prevent driveline bump during a downshift when a throttle valve is closed

摘要

A system according to the principles of the present disclosure includes a downshift determination module and a speed control module. The downshift determination module determines when a closed-throttle downshift occurs. The closed-throttle downshift is a downshift of a transmission when a throttle valve of an engine is closed. The speed control module controls engine speed based on turbine speed during the closed-throttle downshift. The turbine speed is a speed of a turbine in a torque converter that couples the engine to the transmission.

主权项

1. A system comprising:
a downshift determination module that determines when a closed-throttle downshift occurs and that generates a signal indicating when the closed-throttle downshift occurs, wherein the closed-throttle downshift is a downshift of a transmission when a throttle valve of an engine is closed; and a speed control module that receives the signal and that controls engine speed based on turbine speed during the closed-throttle downshift while the throttle valve is closed, wherein the turbine speed is a speed of a turbine in a torque converter that couples the engine to the transmission.