Citroen C4 WRC HYmotion4 Concept

This Citroen C4 WRC HYmotion4 Concept is the first project of a World Rally Car to be equipped with a hybrid energy recovery system which delivers added performance and lower emissions. This concept car - which delivers a split livery, with the team's familiar World Rally Championship colours on one side, and a design based on a more restful colour scheme redolent of natural materials on the other - illustrates Citroen's stand on environmental matters.

The HYmotion4 system enables a proportion of the kinetic energy produced during braking to 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. It can then be employed either to deliver extra power when accelerating or to drive the car using emission-free electrical power alone, with no engine noise or exhaust fumes.

This system can significantly enhance the efficiency of a competition car during the different running phases: Braking energy is not entirely dissipated in the environment, the availability of additional torque thanks to an electric motor increases the internal combustion engine's useful rev range, at constant speed in electrical mode, the vehicle benefits from a longer range (plus 40 km), while fuel consumption on road se ctions is reduced by 30%.

The system comprises four key components: a 125 kW electric motor-generator connected to the rear differential (gear driven), a pack of 990 cells lithium-ion batteries which deliver a voltage of 400 V positioned over the fuel tank, two additional cooling systems for the motor-generator and batteries, with a specific radiator positioned under the right-hand side of the floor and an electronic control unit to manage the system's power electronics circuit. The additional weight of the system is not quoted.

wallpapers of the Citroen C4 WRC HYmotion4 Concept