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      09-19-2019, 06:06 PM   #1
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BMW's First 48V Mild Hybrid System Will See First Action in 5 Series

BMW Announces First 48V Mild Hybrids

BMW has announced its first mild hybrid 48V models, starting with 5 Series diesels.

What is a mild-hybrid? They are vehicles that run off a 48V battery system instead of the traditional 12V system. Mild hybrids feature a larger 48V battery that works with the conventional 12V battery. The 48V often features an integrated starter generator (which it does in BMW's just announced system), which acts as both a starter motor and a power bank to assist the engine.

The big difference between a mild hybrid and a full hybrid is that the electric motor in a mild hybrid does not actually propel the vehicle on its own. The electric motor serves only to assist the the gasoline or diesel engine. The electric motor in a mild hybrid is acting as a power booster. It also saves fuel by shutting off the gasoline/diesel engine when the vehicle is stopped, braking or cruising. The electric motor also helps the engine restart with improved efficiency.

BMW's announcement:

BMW 5 Series: mild-hybrid technology for extra sprinting power and efficiency.

September 17, 2019

In autumn 2019, BMW will present another element in its powertrain electrification strategy to accompany the ongoing expansion of its plug-in hybrid line-up. Mild-hybrid technology will make its debut in the BMW 5 Series, where it will help to both lighten the combustion engine’s workload and boost its power, meaning not just superior efficiency but sharper performance. Fitting an extremely powerful 48V starter-generator and a second battery significantly enhances the functionality of Brake Energy Regeneration by enabling the energy recuperated when braking or on the overrun to be harnessed not just for powering electrical vehicle functions, but for generating additional drive power. For this, the 48V starter-generator acts likes an electric drive unit that assists the engine, allowing the latter to operate within an efficiency-optimised load range as frequently as possible. An electric overboost function, meanwhile, injects an extra dose of dynamism when accelerating under full throttle.

The 48V starter-generator has the additional benefit of allowing the engine to be switched off with remarkably little vibration and restarted more smoothly when using the Auto Start Stop function. This also makes it possible to completely shut off the engine in coasting mode, rather than just disconnecting it from the drivetrain. As of November 2019, mild-hybrid technology will be fitted as standard on the BMW 520d Sedan (fuel consumption combined: 4.1 – 4.3 l/100 km; CO2 emissions combined: 108 –112 g/km), BMW 520d xDrive Sedan (fuel consumption combined: 4.5 – 4.7 l/100 km; CO2 emissions combined: 117 – 123 g/km), BMW 520d Touring (fuel consumption combined: 4.3 – 4.5 l/100 km; CO2 emissions combined: 114 – 118 g/km) and BMW 520d xDrive Touring (fuel consumption combined: 4.7 – 4.9 l/100 km; CO2 emissions combined: 124 – 128 g/km). The fuel consumption figures of the 140 kW/190 hp four-cylinder diesel engine that powers this quartet of models will be cut by up to 0.3 litres per 100 kilometres as a result.

The enhancements to the BMW 5 Series range also include the introduction of BMW Laserlight on further model variants. This lighting technology – which increases high-beam range to a maximum 650 metres – will be added to the wealth of innovations aboard both the BMW M550d xDrive Sedan and BMW M550d xDrive Touring from November 2019.

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