METHOD AND SYSTEM FOR SELECTING AN ENGINE OPERATING POINT FOR A HYBRID VEHICLE

摘要

A vehicle includes a powertrain having an engine and an electric machine (M/G) connected by an upstream clutch, and a gearbox connected to the M/G by a torque converter. A controller is configured to, in response to a Park or Neutral gear selection and an electrical power request from the M/G, operate the engine at an engine speed and an engine torque based on the request and M/G speed and torque for improved powertrain efficiency. A method is provided for controlling a vehicle. In response to a Park or Neutral gear selection and an electrical power request from the M/G, the engine is operated at an engine speed and an engine torque based on the request and M/G speed and torque for improved powertrain efficiency.

主权项

1. A method for controlling a vehicle having an engine selectively coupled to an electric machine by an upstream clutch with the electric machine selectively coupled to a step ratio transmission gearbox by a downstream clutch, comprising:
in response to a park or neutral gear selection in the gearbox and a request for an electrical power from the electric machine acting as a generator, operating the engine at an engine speed and an engine torque determined from a solution for an optimized powertrain efficiency that satisfies the request for electrical power from the electric machine and maximizes a combined efficiency of the engine and the electric machine.