The great leader in automotive components is convinced of the great benefits of its new CVT transmission for electric cars. After its presentation, Bosch now explains the operation of the system, whose secret lies in offering more torque at high speeds.
Among the great virtues of electric cars, one is that of energy transmission. Power and torque from electric motors are immediately transferred to the wheels and the asphalt, with really blazing accelerations. However, there is a limit, as the power increases linearly up to a point where the torque remains constant.
From that critical point, power no longer increases and engine torque begins to decline. This point is the one that Bosch considers dangerous, since there is a significant lack of energy that may be necessary in overtaking, so the real objective of Bosch is get increased torque, a solution that Porsche solved in the Taycan with a two-speed gearbox. In fact, in the most technical forums there has been talk of the possibility of using a gearbox with three speeds.
Weakening of torque is the big problem
An automatic transmission that it would allow to increase the engine torque, even at lower revs, but the automotive giant believes that it is not a solution. Instead, Bosch does understand that the performance of its new CVT gearbox especially for electric cars solves this issue.
The German supplier has explained that the transmission keeps the engine speed in a specific area of the operating map below the critical point, increasing engine torque but also reducing electricity consumption between 3 and 4% in a car and up to 10% in an electric van.
For now, the CVT transmission is still a prototype that has to lower the weight significantly from the current hundred to just over 20 kilograms, and that has to be sold to the manufacturers. Bosch notes that weakening of the motor torque is particular to synchronous electric motors that work with an electro-magnet, so it is not the most common system of future electric platforms. One more disadvantage that would make this transmission travelless would be a new generation of electric motors that would avoid the problem of low torque.