Engine Start/Stop systems are becoming standard in almost every vehicle category to meet emission targets. However the end customers poorly accept conventional solutions with an engaging pinion starter due to their operational behavior. To improve especially the starting performance of a combustion engine, this paper shows a one-way clutch (OWC) system for permanently engaged starter (PES), that can be integrated into the flexplate respectively (dual-mass) flywheel of a powertrain and disconnects the starter motor from the crankshaft after engine start. Designed as a robust, dry running system, it has low requirements in terms of installation space needed between the internal combustion engine (ICE) and transmission and also low effect on existing engine designs and installation processes of powertrains. Because of its innovative design and the permanently engaged pinion the dry PES has advantages in the operational behavior compared to conventional solutions: (1) "Change-of-Mind" capability (starter motor can be switched on anytime), (2) faster system response and better repeatability, (3) no additional drag torque and no wear at engine speeds above idle, (4) improvement of NVH behavior during engine start, and (5) increase of ring gear durability for higher amount of engine stop/start cycles. BorgWarner's dry PES system not only provides idem advantages compared to present Start/Stop systems, but also enables lot of potentials for future technologies in automotive powertrains with combustion engines: (1) Advanced sailing and coasting functionality with early engine shut off, (2) hybrid applications with a high number of engine restarts, (3) no additional system required for cold start, and (4) reduction of crankshaft torque load during engine cranking. With an almost unnoticeable shut off and restart of the combustion engine, these technologies besides saving fuel also provide the potential to obtain wide acceptance of Start/Stop systems by the end customers.
Dry running, Permanently Engaged Starter System (PES) for a comfortable start of combustion engines providing further potential to reduce fuel consumption
2014
15 Seiten, Bilder, 2 Quellen
Conference paper
English
Permanently engaged starter concept for comfortable launch & excellent efficiency
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