Fiat 500 and Panda to gain mild hybrid technology

The Fiat 500 and Fiat Panda will be gaining new hybrid technology from February and March 2020 respectively.

The new petrol mild hybrid engine combines the latest 3-cylinder FireFly 1.0-litre engine family with a 12-volt BSG electric motor and a lithium battery that delivers 70hp (51kW).

Compared to the outgoing 1.2-litre 69hp petrol engine, the mild hybrid version improves fuel efficiency, reducing CO2 emissions on the road by up to 30 per cent without impeding performance. It also ensures a very high standard of driving comfort thanks to the BSG system, allowing for a quiet, vibration-free restart of the internal combustion engine in Stop&Start mode.

The new 1.0-litre, 3-cylinder engine has a peak power output of 70hp (51kW) at 6,000rpm and peak torque of 92Nm at 3,500rpm. The cylinder head has two valves per cylinder and a single camshaft with continuous variable valve timing (the timing is chain-driven). The structure includes a compact combustion chamber, high-tumble intake ducts and external Exhaust Gas Recirculation (EGR), providing a high compression ratio (12:1), which translates into better thermal efficiency.

The BSG system is mounted directly on the engine and is operated by the belt that also drives the auxiliaries. The system recovers energy during braking and deceleration, stores it in a lithium battery with a capacity of 11Ah, and uses it, at a maximum power of 3,600W, to restart the engine in Stop&Start mode and to assist it during acceleration.

This technology allows the internal combustion engine to switch off by shifting into neutral, even at speeds below 18mph. The dashboard, which displays information on the hybrid system, prompts the driver when to shift.

The mild hybrid propulsion unit used in the Panda and 500 receives a 6-gear manual transmission (transverse gearbox, front-wheel drive), aimed at improving fuel economy in out-of-town driving, thanks to new low-friction bearings and gaskets and the use of a specific high-efficiency lubricant. The new system also involves lowering the entire power unit 45mm so the car behaves better on the road thanks to the lower centre of gravity.