ea888发动机资料.pdf

1 - Dr.-Ing. Th. Heiduk, Dipl.-Ing. R. Dornhöfer, Dipl.-Ing. A. Eiser, Dr.-Ing. M. Grigo, Dipl.-Ing. A. Pelzer, Dr.-Ing. R. Wurms, AUDI AG, Ingolstadt The new generation of the R4 TFSI engine from Audi Abstract The new 1.8l TFSI engine in the Audi B8 family (A4, A5) is the third generation of the four- cylinder inline TFSI technology to be launched onto the market by Audi. The engine has been completely revised in order to meet ambitious CO2 targets and ensure compliance with future EU6 emissions standards. The development also incorporated other strategic objectives, such as cross-market applicability and integration into the VW Group's worldwide manufacturing network, as ongoing key elements of the EA888 global engine family. The new generation features numerous innovative technologies, including a cooled exhaust manifold integrated into the cylinder head, a combined FSI/MPI fuel injection system with 200 bar high-pressure injection, and the Audi valvelift system [1, 2] on the exhaust side in combination with an exhaust camshaft adjuster. A particular highlight is the world's first deployment of an entirely newly developed rotary slide control system to implement intelligent thermo-management. Bringing together all the fundamental revisions to components with a view to optimising thermodynamics, friction and weight, the first embodiment of this new engine generation – the 1.8l TFSI – represents a new benchmark in its class in terms of fuel efficiency and performance. 32. Internationales Wiener Motorensymposium 2011 - 2 - Figure 1: Overall view of the new EA888 R4 TFSI engine (longitudinal installation of the engine) 1. Introduction / development goals The history of Audi TFSI engines extends back to 2004, when the world's first direct- injection turbo engine, based on the tried and proven EA113 engine series, went into production (2.0l TFSI) [3, 4]. Development of the concept for the new EA888 engine series [5] with chain drive had actually begun back in 2003, with the aim of replacing the successful timing belt driven EA113 series. The EA888 engine was designed from the very beginning as a 'global engine' for the VW Group (across all brands and platforms) and for worldwide application (across all markets). Following the successful launch of this completely new engine generation in spring 2007 (Gen.1) [5] and the introduction of the Audi valvelift system as well as numerous measures to optimise friction in the 2009 models (Gen.2) [2], a further ground-breaking optimisation (Gen.3) is about to be put into production in the Audi B8 family (Figure 2). 32. Internationales Wiener Motorensymposium 2011 - 3 - The first and second generation EA888 engines are already more than meeting their original objective of serving as 'global engines' (i.e. for a wide variety of vehicle platforms and Group users), having reached production levels of over one million units a year. Figure 2: Roadmap of Audi R4 TFSI engine technology [2, 3, 5, 6, 7, 8] The R4 TFSI engine series EA113 and EA888 have achieved an unmatched record of success since 2005, winning a total of 10 awards in the prestigious “International Engine of the Year“ and “10 Best Engines“ competitions. The third generation of the EA888 marks the next chapter in the history of R4 TFSI engine technology, and is poised to continue the success story. Other variants (with varying engine capacity, power output and torque specifications) are in preparation alongside the third generation unit presented here. The goal of the third generation is to significantly improve the engine's already good power, torque and fuel efficiency. It also aimed to substantially reduce the weight of the unit, while maintaining at least equivalent comfort attributes, and to improve the unit's robustness in order to meet the increasing demands of hybridisation on the one hand and to enable its use in emerging markets on the other. Another key development goal was to conform to future emissions standards, particularly the stringent EU6 standard which will be mandatory in Europe as from 2015. The new generation of the EA888 engine series is a key tool for Audi – and for the entire VW Group – in attaining future CO2 targets worldwide. 32. Internationales Wiener Motorensymposium 2011 - 4 - 2. Engine features / technical highlights For the third generation of the EA888 engine the tried and proven power train layout with Lancaster balance was adopted, also incorporating further improvements in terms of internal friction. For example, the main bearing diameter has been further reduced; the balance shafts are in part roller bearing mounted; and the pressurised oil circuit, including the control oil pump, has been optimised. To improve the torque characteristic, the tried and proven Audi valvelift system has been adopted from the above-mentioned 2.0l second generation predecessor engine, and an additional exhaust camshaft adjuster has been integrated. The high torque of 320 Nm at 1500 rpm delivers ou。