The FIRST TEST – The electric sedan Taycan has opened new avenues for the Porsche, waiting to launch its derivatives (including the station wagon Taycan Sports and Tourism) has already launched the development of a second new model to the batteries: it’s an suv waiting in 2021, quite probably, the future generation of the Macan. For this model the engineers at Porsche Engineering are working with a new platform that can count on four electric motors, one per wheel, a solution that is considered to be the most effective way to improve the distribution of torque between the wheels and make the car more stable, secure, and fun to drive, even for funds that are very low grip (the Taycan instead has 2 motors, one per axle of the wheels).
THE RIGHT TRACTION – The traditional 4×4 in need of the transmission shaft and the central differential to transfer the motion from the driven axle to the other, but this results in complications and additional weight. The system is working on the Porsche is more effective under this point of view, because each engine can deliver the right amount of torque. Each wheel, in other words, is independent from the others and receives more or less torque depending on the needs. The torque distribution may also vary with great flexibility in the function of driving style and the conditions of the path and the road surface: it is possible to transfer it from 100% to the front wheels or the rear wheels, but a wheel or two crossed between the front and rear, and so on.
THE KEY IS IN the SOFTWARE – The most difficult part for the engineers of the Porsche is the setup of the softwarethat manages the engine, nicknamed the “observer”, because as an observer constantly monitors a series of parameters of the car, as the steering angle, the acceleration and the angle of the vehicle with respect to its vertical axis (the data coming from a sensor, yaw rate). The software creates a simulation of the car taking into account of the information received, and compares with the simulation of the car in the ideal conditions: if there is some discrepancy, due for example to the understeer, it intervenes on the engines to avoid the loss of grip. The principle of operation is similar to the stability control, but this cuts the torque to each wheel; the software can cut the couple but also increase it.