Subsequent testing in Faro, Portugal was the first at rally speeds and under rally conditions. The C4 Hybrid was developed using Citroen’s WRC championship contender as a base and adding a 990 cell lithium ion battery and a UQM Powerphase 125 electric propulsion system which drives the rear wheels.

“This system, developed by Citroen Racing, allows the driver to choose between four different modes of functionality,” explains Didier Clement, one of the race engineers behind the project. “In internal combustion mode, the C4 WRC Hybrid4 behaves exactly like one of the C4 WRC cars that compete on the World Rally Championship. In internal combustion mode, with energy recovery mode switched on, braking endurance is improved and the batteries get charged. On road sections and in the service park, electric mode with energy recovery means that there is less nuisance, increased range and less wear on the conventional engine. Finally, in boost mode – which employs both the internal combustion engine and the electric motor – gives an extra 300 Nm of torque when engaged.”

The two engines are linked to the same drivetrain. The driver can choose electric mode simply by switching on the ignition without starting the internal combustion engine. The gearbox paddles then gives the driver a choice of three settings: forward, backwards and neutral.

(Source) Press

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