Recently, cyber-risks in modern intelligent vehicles have become concerns to society. First, carry-in devices, such as smart-phones and USB-memory-devices used outside of vehicles expose vehicles to various cyber-attacks from the external IT (Information Technology) world. Next, Global Navigation Satellite Systems (GNSS) which provide position information to many valuable functions have vulnerabilities to jamming and spoofing. Finally, emerging vehicle-to-vehicle communication poses security challenges, because of its unique communication schema where all neighboring vehicles exchange data within a short duration. In this report, we examine these vulnerabilities’ impact on vehicle cyber-security and introduce various countermeasures against these vulnerabilities in the US.
Wheel aerodynamics of passenger cars has recently been under close investigation due to its influence on the aerodynamic forces on the vehicle. In modern wind-tunnels the wheel rotation can be resembled close to reality, while, in their CFD development process, car manufactures rely on simplified models for considering rotating wheels. In this paper, model-scale generic and production wheels are investigated experimentally, in respect of the influence of geometry, camber and a brake disc. The data is used to assess the accuracy of CFD simulations using open-source software and their applicability in a manufacturer’s CFD process.
For the wind tunnel testing of race car aerodynamics, it is essential to cover the real underbody flow field characteristics, as they affect the aerodynamic balance of race cars and, hence, the transferability of wind tunnel measurements to on-road conditions. In this study, numerical simulations have been performed to determine the influence of moving belt dimensions on the aerodynamic forces for a particular race car. The results are compared with an infinitely large moving ground in open road conditions. Thus, the requirements for the dimensioning of a single belt moving ground simulation in wind tunnels for race car aerodynamics are derived.
Continuously Variable Transmission (CVT) technology is spreading. Fuel consumption is a key driver. Next to driveline synergy optimizations the improvement of CVT components is mandatory to comply with increasing demands. Pushbelt development within Bosch focuses on measures that support both directions. The latest pushbelt release contains measures that improve variator efficiency and ratio coverage at increased torque capacity and wear resistance. This paper explains these measures and their working mechanisms. The newly developed pushbelt combines enhancements in fuel efficiency and power density in a recently released transmission where it supports the world’s largest CVT ratio coverage of 8.7(1).