[car fanatics]

BMW
Photo credit: BMW
July 6, 2012
By: CF staff

The all-new BMW ActiveHybrid 3 brings cutting-edge hybrid technology to the quintessential sport sedan for a new take on The Ultimate Driving Machine TM. The ActiveHybrid 3 blends BMW’s TwinPower Turbo 3.0-liter inline 6-cylinder and 8-speed Steptronic automatic transmission with an electric motor powered by a high-voltage battery. Together the inline 6 and electric motor combine for 335 horsepower and 332 lb-ft of torque, an increase of 13 percent and 11 percent respectively. In addition to the boost available for the internal combustion engine, the electric motor is capable of powering the ActiveHybrid 3 emissions free for speeds up to 45 mph (70 km/h) for distances up to 2.5 miles (four kilometers). The 2013 BMW ActiveHybrid 3 will arrive in US showrooms this fall at an MSRP of $50,195 including destination and handling.

Electric motor and eight-speed automatic transmission share the same housing.
BMW expanding the availability of its intelligent hybrid drive technology with its next ActiveHybrid production model. Again, a gasoline engine is combined with an electric motor to enhance both efficiency and the brand’s hallmark driving pleasure.

In the BMW ActiveHybrid 3, BMW’s 3.0-liter TwinPower Turbo in-line six engine is coupled with an electric motor and an eight-speed Steptronic automatic transmission which sends combined power of 335 hp to the rear wheels. The BMW ActiveHybrid 3’s synchronous electric motor is powered by a lithium-ion high-voltage battery housed under the luggage compartment between the wheel arches. The latest-generation BMW ActiveHybrid technology also adds precisely controlled – and extremely efficient – energy management to the mix.

The result is an extremely well-integrated overall system which convincingly showcases the benefits of BMW ActiveHybrid technology out on the road.

Powerful and efficient: the award-winning BMW TwinPower Turbo inline 6-cylinder in the BMW ActiveHybrid 3.
The BMW ActiveHybrid 3 is the second hybrid model from BMW – after the BMW ActiveHybrid 5 – to use an in-line 6-cylinder engine in its powertrain. Also featured in the BMW 335i, this engine develops maximum output of 300 hp at 5,800 rpm and maximum torque of 300 lb-ft between 1,200 and 5,000 rpm. It has gained wide recognition as offering outstanding driving enjoyment and efficiency.

It has already won the international “Engine of the Year” award two years in a row. The six-cylinder powerplant’s BMW TwinPower Turbo technology comprises a twin-scroll turbocharger, High Precision Direct Injection and VALVETRONIC fully variable valve timing. This technology package improves throttle response and revving ability as well as refinement and efficiency, while an aluminum crankcase also optimizes weight.

Electric motor: eager power delivery, compact design.
The BMW ActiveHybrid 3’s synchronous electric motor develops a maximum output of 55 hp. As well as supporting all-electric operation around town, it can also provide a performance-boosting function for more powerful acceleration. In either case, the drive power is supplied instantly and without lag. Like all electric motors, this one develops its full torque – of 155 lb-ft – from a standing start.

The electric motor is compactly integrated within the housing of the eight-speed automatic transmission, and is connected to the transmission by a clutch. Its operating temperature is controlled by the cooling system of the internal combustion engine. Thanks among other things to its high internal efficiency and low weight, the eight-speed automatic transmission contributes to the efficiency of the powertrain as a whole.

With its eight speeds, it combines a wide gear range with close ratio spacing. It also allows more use to be made of top gear, for a fuel-efficient, low-rpm driving style. The direct downshift capability and exceptionally short shift times can support very sporty driving, too. Throughout, the high-performance transmission controller ensures that gear changes are always closely matched to the driver’s demands and the driving situation.

Optionally, the BMW ActiveHybrid 3 can be supplied with a quick-shifting sports automatic transmission, whose dynamic characteristics are emphasized by a customized selector lever and steering wheel-mounted paddle shifts.

Lithium-ion high-voltage battery housed underneath the boot.
The electric motor is powered by a lithium-ion high-voltage battery, which was developed specifically for the BMW ActiveHybrid 3. The battery is encased in a special high-strength housing and positioned between the wheel arches in the trunk. This provides optimal protection for the battery and helps to ensure a well-balanced weight distribution. The battery cooling system is integrated into the air conditioning cooling circuit. The battery comprises 96 cells and has an effective energy capacity of 675 Wh.

In addition to its conventional 14V electrical system, the BMW ActiveHybrid 3 is also equipped with a high-voltage electrical system with 317 volts. Linked by a voltage transformer, these two systems provide maximum electrical power throughout the operating range, for improved performance and comfort. Both the electric motor and the air conditioning compressor are powered exclusively by the lithium-ion high-voltage battery, via the high-voltage electrical system. This allows the desired interior climate to be maintained even when the internal combustion engine is not running – i.e. when the car is at a standstill, operating purely on electric power or in coasting mode.

Full-hybrid capabilities for zero tailpipe emissions, boost function for extra-dynamic performance.
Up to a speed of 45 mph (75 km/h), the BMW ActiveHybrid 3 can operate in all-electric mode for zero emissions when coasting and in city traffic. Fully charged, the lithium-ion high-voltage battery provides an all-electric driving range of up to 2.5 miles (four kilometer) at an average speed of about 20 mph (35 km/h).

The internal combustion engine is only started when the driver requires more power; it is then engaged automatically. Its performance can be boosted by the electric motor to provide extra power when accelerating. Maximum combined power is 335 hp, with maximum torque of 330 lb-ft). Under combined ICE/electric power, the BMW ActiveHybrid 3 delivers a 0 to 100 km/h (62 mph) acceleration time of 5.3 seconds. The Sedan’s governed top speed is 155 mph (250 km/h) when equipped with performance tires.