Method and apparatus for controlling a multi-mode powertrain system to avoid an operating region

摘要

A powertrain system includes an engine coupled to a multi-mode transmission configured to transfer tractive torque to an output member coupled to a ground wheel. A method for operating the powertrain system includes identifying an undesirable operating region for the multi-mode transmission associated with driveline growl including an input torque range and an output torque range. In response to a command to traverse the undesirable operating region from a first operating region to a second operating region, a fast engine torque transition is executed including controlling the engine as a fast-adjusting torque actuator to control input torque from the engine to the multi-mode transmission and correspondingly controlling motor torque from a torque machine to the multi-mode transmission to maintain output torque from the multi-mode transmission responsive to an output torque request while traversing the undesirable operating region from the first operating region to the second operating region.

主权项

1. A method for controlling a powertrain system including an engine coupled to a multi-mode transmission configured to transfer tractive torque to an output member coupled to a ground wheel, comprising:
identifying an undesirable operating region for the multi-mode transmission conducive to driveline growl, the undesirable operating region defined by an input torque range and an output torque range; and in response to a command to traverse the undesirable operating region from a first operating region to a second operating region, executing a fast engine torque transition including controlling the engine as a fast-adjusting torque actuator to control input torque from the engine to the multi-mode transmission and correspondingly controlling motor torque from a torque machine to the multi-mode transmission to maintain output torque from the multi-mode transmission responsive to an output torque request while traversing the undesirable operating region from the first operating region to the second operating region rapidly to minimize operating time in the undesirable operating region.