Gm Global Technolgoy Operations, Inc.

Michael Arnett

Sean W McGrogan

Steven E Schulz

Silva Hiti

Christopher E Whitney

Goro Tamai

Bon Ho Bae

Adam J Heisel

Krunal P Patel

Shaochun Ye

Alexander K Rustoni

Anthony L Christman

Per Andersson

Ronghui Li

Justin A Zaydel

Methods, system and apparatus are provided for reducing power loss in an electric motor drive system that includes an electric machine and an inverter module. A controller determines whether a torque command (T) is less than a minimum torque threshold (T) that is required to disable the inverter module, and if so, increments a counter and determines whether the torque command (T) remains less than the minimum torque threshold (T). When the torque command (T) remains less than the minimum torque threshold (T), the controller checks to determine whether a current count value (n) maintained at the counter is greater than a count threshold (n), and if so, the controller can generate a disable signal to disable switching within the inverter module.

Methods, systems and apparatus for reducing power loss in an electric motor drive system

A method for managing a threshold increase in output torque capability in a vehicle includes detecting the threshold increase in output torque capability using a controller, and automatically limiting, via the controller, a rate of change of an actual output torque from a transmission of the vehicle in response to the threshold increase. The actual output torque is provided via a traction motor solely using battery power from an energy storage system. The method may include calculating a difference between the threshold increase and the actual output torque, and limiting the rate of change using a rate that is proportional to the difference. A vehicle includes the ESS, a transmission, and a controller. An output member of the transmission is powered using electrical energy from the ESS. The controller manages an increase in output torque capability as noted above.

Output torque management in a vehicle having an electric powertrain

A method for controlling output torque of a hybrid powertrain system includes determining a constrained output torque in response to an operator torque request, and determining maximum and minimum output torque limits. A time-rate change in the constrained output torque at each of a plurality of torque breakpoints is determined. A desired output torque is determined. A preferred output torque is determined as the desired output torque adjusted using the time-rate changes in the constrained output torque at the plurality of torque breakpoints and limited within the maximum and minimum output torque limits. Torque outputs of torque generators of the hybrid powertrain system are controlled in response to the preferred output torque.

Method for controlling torque output of a hybrid powertrain system

A throttle control system includes a pressure comparison module and a throttle plate control module. The pressure comparison module determines an inlet pressure upstream from a throttle body and an outlet pressure downstream from the throttle body. The throttle plate control module controls a position of a throttle plate based on the inlet pressure and the outlet pressure.

Throttle control systems and methods for internal combustion engines to reduce throttle oscillations

A method includes determining an amount of power currently available from a battery for tractive torque as an amount of power stored in the battery less an amount of power required to power other vehicle components, and less an amount of power required to start the engine. An output torque limit when torque is provided only by the motor and power required to provide the output torque limit are determined based on test data. A maximum output torque is calculated by multiplying the amount of power determined to be currently available for tractive torque by a ratio of the output torque limit to the amount of power required to provide the output torque limit. The current output torque may be reduced at a predetermined rate until within a predetermined range of the lesser of the maximum output torque and the output torque limit if an engine start is requested.

Method of controlling a hybrid powertrain to ensure battery power and torque reserve for an engine start and hybrid powertrain with control system

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Wixom, MI, United States of America

Michael Arnett