Ford Fiesta Brings Electrification to Mass Market

Ford’s top selling car in Europe is the latest to be given an electrified powertrain.

The Ford Fiesta compact hatchback is now available with the automaker’s EcoBoost mild hybrid powertrain. These are available in 122bhp and 151bhp power output versions and feature a belt-driven integrated starter/generator (BISG) in place of the standard alternator, allowing recovery and storage of energy usually lost during braking and coasting to charge a 48-volt lithium-ion air-cooled battery pack.

The BISG also acts as a motor, integrating with the engine and using the stored energy to provide torque assistance during normal driving and acceleration, as well as running the vehicle’s electrical ancillaries. This system continuously monitors how the vehicle is being used to determine when and how intensively to charge the battery and when to employ the stored battery charge using one of two methods.

The first is torque substitution, which uses BISG to provide up to 18ft-lbs of torque, reducing the amount of work required from the gasoline engine and contributing to claimed CO2 emissions of 109 g/km on the WLTP rating and fuel efficiency from 52.3mpg (44.38mpg US), almost 5% compared to the solely ICE 1.0-liter EcoBoost engine. Secondly, torque supplementation can be deployed to increase the peak torque available from the powertrain by up to 16ft-lbs of torquw above the level available from the gasoline engine alone, delivering a claimed 177ft-lbs of torque for the 151bhp powertrain and up to 50% more torque at lower rpm.

Ford claims its BISG system allows lower compression ratios while adding a larger turbocharger for more power. It also mitigates turbo-lag using torque supplementation that rotates the engine faster for maintained turbocharger boost response.

All Fiesta engines, including the ICE in 92bhp and 122bhp power outputs, now feature cylinder deactivation. This switches off one of the cylinders when full capacity is not needed, such as when coasting or cruising with light demand on the engine and can disengage or re-engage one cylinder in 14 milliseconds. A 82bhp 1.5-liter TDCi diesel engine is also offered for high-mileage drivers.

— Paul Myles is a seasoned automotive journalist based in London. Follow him on Twitter @Paulmyles_


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