VARIABLE VALVE TRAINS THE EvoLviNG ENGINE Pierburg GmbH Alfred-Pierburg-StraBe 1 41460 Neuss Germany KSPG Automotive KSPG Automotive

DOUBLY COMPLEMENTARY UniValve and FlexValve precision for high rpm UniValve - Design and Function "WE’RE WORKiNG ON TOMORROW’S AUTOMOBiLE ENGiNE.” Dr. Dirk Hunkel, Director Business Unit Variable Valve Train systems, Pierburg GmbH Gasoline or diesel? For years, these arch rivals have charged ahead along their independent respective development paths, each chiding the other with its own technical advances. Each system has its strengths, but also its weaknesses. The stoichiometric gasoline engine features a highly efficient and cost effective after-treatment system thanks to its three-way catalytic...

DOUBLY COMPLEMENTARY UNIVALVE: MAKING YOUR ENGINE FITTER FOR THE FUTURE. FLEXVALVE: THE VALVE TRAIN UPGRADE FOR DIESEL And Heavy-Duty engines. Until now, the gas exchange of gasoline engines has always been associated with pumping losses. The reason is that the throttle body has to be closed for part load operation. univalve fulfils engine designers’ longstanding goal of achieving adjustment of cylinder filling to meet changing operating conditions by means of variable valve timing. UniValve has a compact, straightforward design. The uncompromising use of roller contacts througout the system offers...

UniValve: Precision for High RPM 5 UniValve features two mechanical cam mechanisms in series. The UniValve rocker assembly is the heart of the system. The camshaft keeps it moving in an oscillating motion and the assembly subsequently transfers its movement to the roller finger follower. Position and orientation of the UniValve rocker are changed to give the desired family of continuously variable valve lifts. UniValve can also completely deactivate individual valves, fully shutting down their respective cylinders. Now, that’s downsizing on demand. Strong on every side Even greater potential...

FlexValve is based on DuoCam, a twin cam camshaft as the name indicates. An actuator, similar to a cam phaser, changes the angular relationship of the shaft and tube and hence their associated cam lobes, which are in contact with the Flexvalve rocker. The Flexvalve rocker “adds together” the two cam profiles. Thus, altering the angle between shaft and tube allows the valve lift to be varied. The Flexvalve system comprises a single lobe (1), pinned to the inner shaft (2) of the DuoCam shaft. The two outer cam lobes (4) are fixed to the tube (3). The phasing between the lobes (1) and (4) may be...

Our own surveys indicate up to 12 % fuel reduction in the mapping area with the same or even improved full load and emissions performance Up to 12 % fuel consumption reduction Fuel consumption shown as l/100 km This chart shows the targeted values for 2015 and 2020, as well as values that are in discussion for 2025. You’ll also find the penalty fees that will apply as of 2020 and the European fleet average for 2012. This European Parliament regulation calls for the reduction of the average fleet consumption and the cutting of carbon emissions produced by European automobile manufacturers to 95...

We work with you to produce a bespoke design for the future. THE EVOLUTION OF YOUR ENGINE A component can perform to its full potential only if it integrates perfectly into its technical environment, which is why we wouldn’t sell you an off-the-shelve valve train system. No, we design your valve train system to meet your specific requirements. That’s only possible if we work closely with you. In the following, you’ll learn what we mean. INITIAL DISCUSSION In this phase we ask many questions, because we desire to know exactly how you envisage your variable valve train system. And of course, we‘re...

“Variable valve train systems are not something you get off the shelf.” Heinrich Dismon speaks about variable valve train systems and the future of motor vehicle engineering. Mr. Dismon, how long have you been working on variable valve train systems? In 2007, I was the senior director of advanced engineering at Pierburg. Back then, we carefully considered which products we would have in our portfolio today, which are suitable for the future and which new products would be a good fit for Pierburg. The variable valve train system was one of these. And you believe that variable valve train systems...

Eventually, you decided to go with two systems: UniValve and FlexValve. Why? We began with UniValve - our preferred system for all gasoline engines. But it soon became clear to us that there was also demand for an alternative system. So we decided to invest in Flexvalve. For the past year, we’ve worked simultaneously on both systems. Since both systems have specific functional differences, there is no danger of them competing directly against each other. You have different products for different target groups? We do. FlexValve is more for diesel engines whereas UniValve is clearly designed for...

FOR CLARITY: WHAT KSPG DOES. In a nutshell, KSPG designs and manufactures engine parts and provides all the associated services. But there’s more. We are amongst the world’s 100 largest Tier 1 suppliers to the automotive industry. And we play a key role in shaping the engine’s future. The KSPG Group belongs to the Rheinmetall Group and employs over 12,000 people across the globe. KSPG’s Hardparts, Mechatronics and Motorservice divisions together produce a total turnover of 2.4 billion euro. Automotive Hardparts: Whether engine block, plain bearing, large or small bore pistons, this KSPG division...