Porsche Engineering Magazine
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Issue 1/2010 Porsche Engineering Magazine Exclusive insights A smooth ride into the technological highlights of the with the Panamera’s air Boxster Spyder suspension Something in the air at Intelligent light from Porsche Porsche Focus on aerodynamics helps to reduce accidents Contents Editorial 3 About Porsche Engineering 4 Vehicle control systems 5 enable reproducible road tests Intelligent light 8 helps to reduce accidents Maximum efficiency 11 for noise-optimized gearing In hot pursuit 14 with the Porsche Vehicle Tracking System Something in the air at Porsche 16 Focus on aerodynamics Hats off! 19 The Boxster Spyder A smooth ride 23 with the Panamera’s air suspension For fast-shifting drivers 26 Feel the shifting force 2 Porsche Engineering Magazine 1/2010 Editorial Dear Readers, Innovation and passion mean action and not just on our test track but in the minds of our employees as well. We are creative, and with our innovative ideas we help our customers to succeed. In our projects, our engineers design a We always safeguard the confidentiality little piece of the future everyday. Accom- of our external customer projects. In or- pany us on a short journey through the der to give you an insight into our vehicle world of development and experience at development process, in this issue, we first hand our day-to-day fascination with present a Porsche highlight under the our work and our understanding of per- heading derivative development: the formance. new Boxster Spyder, which has set a new benchmark with its lightweight con- Take a look, for example, at the way we struction. The Panamera’s air suspen- develop vehicle control systems that sion system is our next step, not only is enable reproducible road tests and there - it light as a feather but more importantly fore not only yield reliable results but it ensures a smooth ride. above all save time and money in devel - opment. Safety is also an important is- Enjoy these and other highlights from sue when shaping the future. One bright the Porsche development department. spot in this issue is our intelligent light systems. Learn more about how Por- TIP: You can also read our magazine sche Engineering has contributed to a online at www.porsche-engineering.com/ reduction in traffic accidents as a result customermagazine. of these ingenious systems. From light - ing to our anti-theft system we show Enjoy this issue! you how and why Porsche customers need no longer fear having their vehi- Yours cles stolen. The Vehicle Tracking System Malte Radmann and Dirk Lappe from Porsche is the key to this peace of Managing Directors of mind. Porsche Engineering Porsche Engineering Magazine 1/2010 3 Impressum About Porsche Engineering News At Porsche Engineering, engineers are tive developer for your project or would New Management at Porsche working on your behalf to come up with prefer a specialist systems developer, Engineering new and unusual ideas for vehicles and we can offer both, because Porsche industrial products. We develop a wide Engineering works at the interface be- On October 1, 2009, Malte Rad- variety of solutions for automotive man- tween these two areas. All the expertise mann was appointed chairman of ufacturers and suppliers, ranging from of Porsche Engineering converges in the executive board of Porsche En- designing individual components and Weissach, but it is available all over the gineering Group GmbH and Porsche complex modules to planning and im- world, including at your company’s of- Engineering Services GmbH. In both plementing complete vehicle develop- fices or production facilities. Wherever companies he succeeded Dr. Peter ment projects, including production we work, we bring a part of Porsche Schäfer, who moved at that time to start-up management. What makes our Engineering with us. To find out more Dr. Ing. h. c. F. Porsche AG, where he services special is that they are based about us, please request our image has taken the reins as Head of the on the expertise of a premium car man- brochure by email: Main Chassis Development Depart- ufacturer. Whether you need an automo- [email protected] ment. Malte Radmann was previously a member of the executive board of both subsidiaries and the commer- cial director, a role in which he will continue. The executive board will also wel- come Dirk Lappe, who has been re- sponsible for the Electrics/Electro- nics group at Porsche Engineering since 2002 and now holds the posi- tion of technical director. Impressum • Porsche Engineering Magazine Porsche Engineering Magazine – now online too Publisher Editor Porsche Engineering Group GmbH Nicole Möller Our Porsche Engineering magazine Address Design: Machart–Design, Stuttgart Porsche Engineering Group GmbH Repro: Piltz Reproduktionen, Stuttgart is now available online: Porschestraße Printing: Leibfarth&Schwarz, Dettingen/Erms 71287 Weissach, Germany Translation: TransMission Übersetzungen, www.porsche-engineering.com/ Stuttgart customermagazine Tel. +49 711 911-88888 Fax +49 711 911-88999 All rights reserved. No part of this publication may be reproduced without the prior permission of the E-mail: [email protected] publisher. We cannot guarantee that unrequested Website: www.porsche-engineering.com photos, slides, videos or manuscripts will be re- turned. Porsche Engineering is a 100% subsidiary of Dr. Ing. h.c. F. Porsche AG 4 Porsche Engineering Magazine 1/2010 Electrics & Electronics Vehicle control systems Vehicle control system to create reproducible road tests Real road tests are an essential part of the development of modern vehicles. To date the challenge posed by test runs in the field has been the reproducibility of the trials. Porsche Engineering has made a great leap forward with this issue. Components of the vehicle control system DGPS module Control unit HMI module Master Communications module Communications module Slave DGPS module Control unit HMI module When developing functions and testing context, Porsche Engineering has devel- is the control unit, to which the other various systems in the automotive sec- oped a special vehicle control system components such as the Differential tor, for example the driver assistance (VCS). The basic version of the vehicle Global Positioning System (DGPS) and systems, it is important to be able to control system comprises several com- the communication and Human Ma- reproduce a defined test scenario. In ponents in a modular structure. The chine Interface (HMI) modules are con- order to support the test driver in this central module and heart of this system nected. Porsche Engineering Magazine 1/2010 5 Electrics & Electronics Vehicle control systems The modular structure with defined in- accuracies, a differential GPS (DGPS) for example, transmits its actual data to terfaces offers numerous advantages. receiver is used. These receivers achieve the master, which then combines this For example, the modules can be ad- a greater accuracy in that they correct or information with its own actual data in justed either customer-specifically or better interpret the standard GPS signal. order to calculate the relative distance project-specifically. In addition, the ba- There are a multitude of different correc- between the two vehicles. sic system can be easily extended with tion and evaluation systems, which differ further components, such as the con- in terms of their accuracy, price, avail- Control unit nection to a vehicle bus. ability and in their properties. The control unit is the heart of the vehi- DGPS module A mobile DGPS receiver that is accurate cle control system, to which all other to within one meter and boasts high components are connected. Given the The vehicle control system works on availability was chosen for this vehicle multiple tasks and interfaces, the con- the basis of position location which control system. trol unit is also the most complex com- compares the current position with a ponent. Its main task is to serve as a reference position. In order to locate an Communications module central process controller. object’s position, services such as those of the Global Positioning System If several vehicles are involved in a test The tasks can be broken down into (GPS) can be used. However, given that case, wireless communication between the following: such services feature deviations in ex- the vehicles is required in the form of cess of ten meters, they are too inexact an ad hoc network. This is used to syn- I Test case recording by travelling for applications in a vehicle control chronize the progress of the test case. the route or manually marking land- system. The vehicle control system re- In addition, optional data such as GPS marks in a map quires an accuracy of less than 50 cen- coordinates can also be exchanged be- I Test case editing by changing timeters. In order to achieve these high tween the vehicles. The slave vehicle, the course or landmarks in a map I Reproduction of the test case by issuing instructions to the driver via the HMI I Evaluation of the test case Human Machine Interface (HMI) The vehicle control system makes it possible to reproduce saved test sce- narios under defined conditions and thereby run through them such that they can be compared. Particular atten- tion is placed here on the HMI being comprehensible, appropriate for the task and effective. With the assistance of the HMI, the test driver should be incorporated in the driving process through visual, haptic and acoustic Manual creation of a route feedback via the control device, as the 6 Porsche Engineering Magazine 1/2010 Electrics & Electronics Vehicle control systems controller in a real road trial. Here the driver performs primarily stabilization Feedback strategies in the vehicle control system level driving tasks. As the longitudinal and transverse deviations must be kept Single mode Dual mode to a minimum while driving the target Stabilization level visual visual & haptic route – in order to guarantee the com- (Stage 1: Information) (Stage 2: Warning with parability requirement – real-time and call for action) E.g.