2008 Citroen C4 WRC HYmotion4 review and pictures

Posted on Thursday, 2 October 2008 , 13:10:21 byVeronica

Filed under CitroenHybridMotorsport

Citroen C4 WRC HYmotion4

At the 2008 edition of the Paris Motor Show, Citroen reveals the C4 WRC HYmotion4 concept car, the first WRC car to be equipped with a hybrid energy recovery system which delivers added performance and lower emissions. The HYmotion4 system enables a proportion of the kinetic energy produced during braking to be recovered and stored. This energy is accumulated by a motor-generator in the form of electricity in battery packs positioned at the rear of the car. This system can enhance the efficiency of a competition car during different phases like the braking energy is not entirely dissipated in the environment, the availability of additional torque thanks to an electric motor increase the rev range of the internal combustion engine and so on. All this is possible thanks to the innovative technological solutions which have been developed to turn the Citroen C4 WRC in to the C4 WRC HYmotion4. Actually this system contains four important elements. First we have a 125 kW electric motor-generator connected to the rear differential, followed by a pack of 990-cell lithium-ion batteries which deliver 400 V. Next we have two additional cooling systems for the motor-generator and batteries, with a specific radiator positioned under the right-hand side of the floor. Last, but not least there is an electronic control unit to manage the power electronics circuit of the system. The model is available with four running modes which can be selected using the HYmotion4 pre-selection rotary control. The internal combustion engine mode is the most frequently-used model. The internal combustion engine mode with energy recovery improves the resistance of the brakes and charges batteries. The electric motor mode with energy recovery is used on road sections, reduces noise in built-up areas and a lot more. Last, but not least we have the boost mode that can be selected at the desired moment on a stage to benefit from an additional 300 Nm of torque for a limited time. We have to admit, Citroen did a very good job with the new model.