Development of a methodology for the application of the recuperation threshold in particular.

Motivation

The possible electric-recuperative deceleration of rear-wheel drive electric vehicles is very limited in curves and/or when the coefficient of friction is low. The vehicles have a tendency to oversteer and thus to become unstable. In the concept vehicle MUTE of the TU Munich, both acceleration and recuperation are controlled via the accelerator pedal. For reasons of ergonomics and safety, the electric recuperative deceleration cannot therefore exceed the deceleration that can usually be safely achieved in curves and at a low coefficient of friction.

Goal

A methodology is being developed which allows the recuperation threshold, up to which the purely electrical deceleration is delayed, to be optimally applied from an energy and driving dynamics point of view. The procedure should in particular make it possible to quantify the advantages of active vehicle dynamics control systems for recuperation.

Procedure

A potential analysis has shown that the safe recuperation at the MUTE can be significantly increased by using Torque Vectoring.

In a further investigation it is shown that the actual improvements depend strongly on the respective vehicle and especially on the driver behaviour. With the help of energetic and driving dynamics quality criteria, the overall quality of the recuperation can be directly evaluated - and thus applied - depending on driver behaviour and vehicle design.