Abstract
Key words :
Automated Transmissions, Global Powertrain Optimisation, Transmission Management.
Abstract:
Automated transmissions are prevalent in most powertrains in Asia and North America. In Europe, these technologies are becoming more and more popular to cover the diversity of customer requirements. This has led to the development of technologies such as Dual Clutch Transmissions (DCT), Continuously Variable Transmissions (CVT), Automated Transmissions (AT) and Automated Manual Transmissions (AMT). To date, the optimisation process focused on powertrain components individually such as the transmission (efficiency, ratios), the engine (efficiency, engine-out emissions) and the aftertreatment (efficiency). However, in light of the evermore stringent European and international emissions legislation, the powertain optimisation must be carried out as a global process in order to maximize the optimisation benefit. This paper presents the optimisation process used to optimize the global powertrain management system for a given engine and transmission on a vehicle whilst meeting customer expectations. An example of this process applied to an automated-transmission, dieselengine vehicle is detailed, in particular how it alone enabled the fuel consumption to be reduced by 3 to 4% whilst fulfilling all other requirements. The process is also used to compare optimised efficiencies for DCT, CVT and AT relative to AMT and Manual Transmission (MT). Finally, the further potential benefits generated by this new process are described.