How it works
4QT combines the design advantages of electric motors with the economics and time proven reliability of traditional engines.
4 Quadrant transmission describes the operating capabilities of an ideal gearbox. It can inject and recuperate energy at just the right time so that mobility becomes both efficient and low emissions.
4QT works like an automatic gearbox. The optimal gear ratio is calculated by an onboard computer, based on the input from the driver. The gear ratio is created by controlling the electromagnets in the gearbox. Local emission targets can be adapted to on-the-fly. While excess and recuperated energy is stored in the battery so that it can be used later on in the journey.
Any and all power requirements are met with an unmatched capability to make the most out of the energy which is required. In this example of a vehicle going up to a speed of 200 km/h (on the German Autobahn!) you can see that the efficiency is close to the exergetic maximum for all torque and velocity combinations.