Hybrid electric vehicle control for minimizing high voltage battery power limits violations

摘要

A control system and method for controlling a hybrid electric vehicle powertrain with mechanical and electro-mechanical power sources that use an intelligent controller adapted to reduce driveline oscillations while minimizing hybrid vehicle battery limit violations. Damping of driveline torque oscillations is accomplished and violations of battery power limits are avoided by filtering estimated engine power.

主权项

1. A control system for a hybrid electric vehicle powertrain comprising:
an engine and engine controller, a battery, a motor-generator, gearing establishing power flow paths to vehicle traction wheels, and a system controller for managing power distribution to the traction wheels to meet driver demand; the system controller being configured to monitor vehicle operating conditions, to calculate an engine output power estimate and to command a traction torque based on estimated engine output power; the engine output power estimate being determined by input variables including generator speed, motor speed and engine torque commands to the system controller; the system controller being configured further to filter the estimated engine output power, to reduce torque disturbances in the power flow paths, and to develop a weight determination factor for modifying the engine output power estimate; and the weight determination factor being adaptive to variable vehicle operating conditions, to satisfy driver torque demand while ensuring compliance with predetermined battery charge and discharge limits.