CPC B62D 59/02 (2013.01) [B60L 7/10 (2013.01); B60L 15/32 (2013.01); B60L 2200/28 (2013.01)] | 13 Claims |
1. A propulsion arrangement for a self-powered dolly vehicle unit, the propulsion arrangement comprising a first electric machine, a second electric machine, a gearbox, and an open differential for driving first and second wheels of a driven axle, wherein the first and second electric machines are arranged in parallel and connected to the open differential via the gearbox at respective gear ratios, wherein the first electric machine is associated with a fixed gear ratio, and the second electric machine is associated with a configurable gear ratio, wherein
the propulsion arrangement further comprises a control unit arranged to determine if the dolly vehicle unit is in a low speed range of operation or in a high speed range of operation, configured to set the configurable gear ratio of the second electric machine in dependence of the low or high speed range of operation and configured to driving the wheels of the self-powered dolly vehicle unit by the motors, wherein a low speed range of operation entails a wheel rotational speed of less than 1000 rpm and a high speed range of operation entails a wheel rotational speed of more than 1000 rpm.
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