5th International Munich Chassis Symposium 2014: by Peter E. Pfeffer

By Peter E. Pfeffer

The key drivers of innovation within the box of chassis structures are measures to enhance automobile dynamics and riding safeguard, efforts to minimize gas intake, and clever improvement equipment. additionally, chassis improvement is concentrating on improving experience convenience whereas additionally enhancing NVH features. whilst, modularization recommendations, techniques for the electrification of the powertrain, and steps in the direction of larger method connectivity are making more and more advanced calls for at the chassis and its improvement. builders are being known as upon to reply to those demanding situations with numerous solutions.

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The lowest CO2-emissions figure among a super sports cars benchmark in the course of the 918 Spyder conception phase was 275 g/km; therefore the target range of 70 g/km to 130 g/km was very ambitious [1]. A second expansion-stage car proved the enormous potential of the car by achieving the pre-estimated 07:14 minutes on the Nürburgring Nordschleife approximately one year before its SOP, highlighted in figure 1. So the development team has been additionally incentivised to move another big step forward.

As an example, it is possible to consider the effect of the compliance, but its calculation needs precise parameter values in every direction and for each parts. In many cases, the rubber bush characteristics are nonlinear. It is often too challenging to estimate and input such value to the calculation during the realistic development process. In current hardware development process for achieving an acceptable level of steering feel, expert drivers express verbally their driving impression. Based on their experiences, engineers define a first set of target values for the component parameters, which can be modified, after further experiments.

It is a electro-mechanical power steering with variable ratio at the front and two single tie rod actuators at the rear corners. a. 46 918 Spyder – the impulse source for future sports car concepts steering angle, vehicle velocity and an understeering parameter to, on the one (front) hand, assist the driver’s steering torque. On the other (rear) hand, the steering actuators position the wheels inversely to the front axle up to approx. 50 km/h and concordantly above 80 km/h. Its effect is a wheelbase-shortening for the former and a wheelbase-prolonging for the latter.

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