BMW today announced the introduction of its newest hybrid, the BMW ActiveHybrid 5. Based on the BMW 535i Sedan, the ActiveHybrid 5 brings together BMW's 3.0-liter TwinPower Turbo inline six-cylinder engine, an electric drive system and an eight-speed automatic transmission for the first time. The latest generation of BMW ActiveHybrid technology also adds precisely controlled energy management to the mix. All of which gives the BMW ActiveHybrid 5 an exceptional balance of performance and fuel economy for a benchmark performance/luxury sedan. Its drive system generates combined output of 335 hp (DIN), allows the car to be driven on electric power alone up to 37 mph (60 km/h), and accelerates the BMW ActiveHybrid 5 from 0 to 60 mph in 5.7 seconds (preliminary). The BMW ActiveHybrid 5 will arrive in US showrooms in March 2012.
The 300 hp inline six with BMW TwinPower Turbo technology in the BMW ActiveHybrid 5 is the same engine renowned for its free-revving capability, pulling power and efficiency in the BMW 535i. The electric motor develops 55 hp and is supplied with energy by a high-performance lithium-ion battery housed in the trunk.
A harmonious blend of power from the two drive systems ensures that the BMW ActiveHybrid 5 boasts not only the sportiest performance in its market segment but also a double-digit percentage improvement in fuel economy over the BMW 535i based on preliminary results. Its full-hybrid drive system enables driving on purely electric power which means emission-free driving in urban conditions.
In order to fully exploit the potential of the BMW ActiveHybrid technology, the power electronics in the BMW ActiveHybrid 5 use a host of technologies to ensure the drive system runs at peak efficiency. The high-performance lithium-ion battery is charged when the car is coasting or braking. The electric motor acts as a generator feeding energy into the high-voltage battery. By contrast, under acceleration the electric motor takes on a boost function. Here, it assists the inline six by generating an extra burst of power, lending the sedan's sporty driving character a noticeably sharper edge.
Integrated into the standard Driving Dynamics Control is an ECO PRO mode. It provides a relaxed and fuel-efficient driving style by tailoring the driving systems for maximum efficiency, including making more frequent use of all-electric mode. In ECO PRO mode, the combustion engine can be switched off and fully decoupled while coasting at speeds of up to 100 mph (160 km/h). This coasting mode combines comfortable driving with optimum utilisation of the kinetic energy already generated. To avoid periods with the engine running at idle - at traffic lights or in stop-and-go traffic, for example - the BMW ActiveHybrid 5 is equipped with a hybrid start-stop function. Plus, the power electronics in the BMW ActiveHybrid 5 are linked up with the standard navigation system. This allows proactive analysis of driving conditions based on the selected route. This enables the drive components to be primed to deliver maximum efficiency (the effect may vary according to the quality of the available navigation data). All the hybrid-specific components of the drive technology and energy management systems have been developed specially for use in the BMW ActiveHybrid 5.
Innovative combination: award-winning six-cylinder in-line engine, newly developed electric drive system.
This is the first time that a BMW inline six has been mated to a BMW ActiveHybrid system. The 3.0-liter engine, which develops 300 hp and peak torque of 300 lb-ft, has won the international Engine of the Year Award two years running. The BMW TwinPower Turbo technology of the six-cylinder engine combines a twin-scroll turbocharger, High Precision Direct Injection, Double VANOS variable valve timing and VALVETRONIC intake control.
The synchronous electric motor of the BMW ActiveHybrid 5 is integrated into the housing of the eight-speed automatic transmission, saving space. The interplay between the electric motor and gearbox is controlled by a clutch. The motor's operating temperature is regulated by the combustion engine's cooling system. The electric drive system develops 55 hp and makes 155 lb-ft of torque available from rest. The motor is supplied with energy by a high-performance lithium-ion battery, specially developed for the BMW ActiveHybrid 5. The high-voltage battery is encased in a special high-strength housing and positioned between the wheel arches in the trunk, providing it with optimum protection. It consists of 96 cells, has its own cooling system and offers usable energy capacity of 675 Wh.
The BMW ActiveHybrid 5 has both a conventional 14-volt power supply and a high-voltage supply with an operating voltage of 317 volts. They are linked by a voltage transformer which ensures that maximum electric energy can be used to enhance driving dynamics and comfort in any operating phase. Like the electric motor, the air conditioning compressor is also fed with power from the lithium-ion battery exclusively via the high-voltage supply. This ensures a pleasant interior climate, even when the combustion engine is switched off - i.e. when the car is at a standstill, operating purely on electric power or in coasting mode. In addition, the stationary climate control function can be used to cool the interior before the engine is started.
Intelligently controlled hybrid technology: unprecedented precision for maximum efficiency.
The BMW ActiveHybrid 5 can operate in all-electric mode up to a speed of 37 mph (60 km/h), for zero emissions in town. The lithium-ion high-voltage battery can store sufficient energy to give an all-electric driving range of up to approximately 2.5 miles (4 km) at an average speed of 22 mph (35 km/h).
The internal combustion engine is only started when the driver requires more power: it is then engaged automatically. The electric motor provides a "boost" function to supplement the engine when accelerating. Maximum combined power is 335 hp (DIN), with maximum torque of 330 lb-ft. Under combined internal combustion/electric power, the BMW ActiveHybrid 5 delivers a 0 to 60 mph in 5.7 seconds (preliminary).