Gm Global Technolgoy Operations, Inc.

Love Lor

Adam J Heisel

Robert L Morris

Nathaniel S Michaluk

Vino Mathew

Jared Kalnins

A method for controlling the powertrain system for a vehicle improves powertrain performance. The powertrain system includes an internal combustion engine comprising a crankshaft, an isolator assembly, a motor generator unit, and a powertrain control module. The isolator assembly includes a first member fixedly connected for common rotation with the crankshaft of the internal combustion engine and a second member. The motor generator unit includes a pulley coupled with the second member of the isolator assembly for torque transfer. The powertrain control module comprises a control logic sequence and controls the operation of the powertrain system.

Method of controlling a powertrain system of a vehicle

A road load module is configured to determine a road load torque to maintain zero vehicle acceleration. A closed loop (CL) module is configured to determine a CL torque based on a difference between a target vehicle speed and a vehicle speed. A motor torque module is configured to: produce a limited CL torque by limiting the CL torque to a predetermined torque limit when a magnitude of the CL torque is greater than a magnitude of the predetermined torque limit; when the vehicle speed is within a predetermined low speed range and a magnitude of the road load torque is greater than or less than a magnitude of a predetermined maximum torque, adjust the predetermined torque limit; and determine a motor torque command based on the limited CL torque and a motor torque request determined based on a position of an accelerator pedal.

Control systems and methods for preventing low vehicle speed

A road load module is configured to determine a road load torque to maintain zero vehicle acceleration. An initialization module is configured to determine an initial torque based on the road load torque. A closed loop (CL) module is configured to: when a CL state transitions from an inactive state to an active state, set a CL torque to the initial torque; and when the CL state is in the active state after transitioning to the active state, adjust the CL torque based on a difference between a target vehicle speed and a vehicle speed. A motor torque module is configured to determine a motor torque command based on the CL torque and a motor torque request determined based on an accelerator pedal position. A switching control module is configured to, based on the motor torque command, control switching of an inverter and apply power to an electric motor.

Growing community of inventors

Farmington Hills, MI, United States of America

Love Lor