Company ZF showed a hybrid Renault DusterJune 22, 2018
The German company ZF presented a hybrid transmission eAMT. It is designed for budget front-wheel drive vehicles and consists of a conventional robotic gearbox with one clutch and an electric motor on the rear axle. Experimental transmission was installed on the crossover Renault Duster.
Robotic box with one clutch – in fact, the usual manual transmission, in which the shift forks and clutch are driven automatically. Automakers like these boxes for their extreme simplicity and low cost. But the shortcomings are great: these are the delays and jerk at switching, caused by a power flow break. Plus, low adhesion reliability.
According to experts ZF, their development has brought to naught the shortcomings of the robotic box. The work of the electric motor on the rear axle is coordinated with the clutch drive. The electric motor is activated every time the clutch is opened. Thus, it was possible to get rid of jerks at gear changes.
The electric drive of the rear wheels works in other situations: with a sharp acceleration, when an additional impulse is required, or when the front wheels slip on a slippery surface.
The demonstration machine is designed as a plug-in hybrid. It implements all the modes typical for hybrids: it is a motion on electric traction with the motor off, coasting, automatic motor shutdown and energy recuperation during braking.
While it is not known when the hybrid transmission eAMT will hit the production cars. The target audience of this development is ultrabudgetary cars like Renault Kwid. Probably, first of all Germans are aiming for the Indian market: it is there that the right-hand drive Renault Duster is produced, and it is equipped with just a robotic gearbox.