COMET ? THE OVERALL VEHICLE CONTROL OF A MILD HYBRIDVEHICLE FOR MORE COMFORT AND LESS FUEL CONSUMPTION

摘要

The COMET project of the Robert Bosch GmbH connects a new hybriddrivetrain to the thermal management system and a CO2 air conditioning system. Thedrivetrain consists of three power units, one engine and two electric drives with 8 kW powereach, based on the 42V technology. An important part of the powertrain is the dual-Etransmission, a power branching transmission with two planetary gears in combination with atwin shaft automated mechanical gearbox. Due to this fact it is possible to drive withcontinuous variable transmission and free-of-traction interruption. All engine auxiliaries wereelectrified, thus no more outer belt drive is necessary. For proving the possibilities of betterdriving comfort and reduction of fuel consumption two prototype vehicles, with gasoline anddiesel engine, were assembled.After an introduction into the vehicle concept and the hybrid drivetrain this paper shows thesystem architecture for the overall vehicle control. The control structure of the COMETpowertrain leads to the optimization problem with two degrees of freedom. The interaction ofthe aggregates during the real driving process, for the functions electric starting, hybriddriving and boost operation, were drawn into diagrams. Additionally, the results for theMNEDC test cycle have been represented.