In this paper, the Hybrid Automatic Repeat Request (HARQ) scheme for Brake-by-Wire (BBW) system is presented. Recently, the use of electronic components is growing, so error signals will be encountered caused by Electromagnetic Interference (EMI).These error signals will cause system failures of BBW systems. To solve these problems in the BBW system, we design a HARQ scheme which is a combination of Forward Error Correction (FEC) scheme and Automatic Repeat Request (ARQ) scheme. FEC scheme uses Reed-Solomon (R-S) code to correct random errors and burst errors and ARQ scheme uses Cyclic Redundancy Check (CRC) code to detect errors in the systems. In this paper, the performance of FEC scheme, ARQ scheme and HARQ scheme is presented through the experiment and we see clearly how the fault tolerant logic for BBW system works.

Mechanical kinetic energy recovery systems have been proposed so far as a driveline component made up of a flywheel, a clutch and a continuously variable transmission connected to the driving wheels and designed for long time and high energy storage and high power charge and discharge rate. In the approach proposed here, there are actually two small KERS, one acting individually on each wheel, made up of just a clutch, a CVT and the flywheel. In this system, braking on one of the two rear wheels otherwise not motored is obtained by engaging the CVT through the clutch. Then, the wheel reduces its speed while the flywheel accelerates. Powering of one of the two rear wheels is then obtained when needed by engaging again the CVT through the clutch. Then, the wheel increases its speed while the flywheel decelerates. When the clutch is disconnected, flywheel and rear wheel are decoupled. This configuration is aimed to a further reduce the complexity and further reduce the costs of the KERS. This KERS has same potentials to reduce the fuel consumption of the traditional driveline based KERS. The system also offers the benefits to produce same accelerations of a four wheel drive car powered by a larger engine with a two wheel drive arrangement.

A new concept for the improvement of cast vented brake disks has been developed which re-lies on the interesting properties of a new type of constructed material: 3D wire structures. This type of material shows a comparably high specific compressive modulus and strength combined with a large internal surface area which is completely accessible by external fluid flow. The high strength of the 3D wire structures is obtained by brazing of the wire joints. It is conceivable to replace the cast internal venting structure of a disk brake by 3D wire structures and hence improve the venting of the rotors. At the same time, considerable weight savings can be expected as a cast fin structure usually occupies about 50 vol% of the space between the rotors, whereas a 3D wire structure occupies only 10 to 20 vol% of the available space. Moreover, the narrow spacing of the 3D wire structure may account for a very homogeneous heat transfer, thus avoiding hot spots and improving the level of comfort. This paper discusses relevant mechanical and thermal properties of 3D wire structures with regard to their applica-tion in vented disk brakes.