|The new 1 Series.|
BMW is introducing its new 1 Series—which includes the 118d, the most fuel-efficient production vehicle yet from BMW—in Europe with a range of fuel-saving technologies.
Brake Energy Regeneration (earlier post), an Automatic Start-Stop function and Electric Power Steering are combined with lower rolling resistance tires and a gearshift change indicator to encourage economical driving. These are in addition to the use of variable valve technologies and High-Precision Direct Injection engines on some 1 Series models that boost power output but cut fuel consumption and emissions.
The BMW 118d, BMW’s most economical car with fuel consumption of 4.7 liters/100km (50 mpg US), combines the new technology with the use of further lightweight engineering. The car now has an aluminium crankcase to save weight. Aside from the BMW Hydrogen 7, the BMW 118d also posts the lowest ever CO2 emissions of any BMW: 123 g/km.
Other engines in the new 1 Series range record economy improvements of up to 24% compared to the previous model, while emissions have also been cut by up to 21, while power outputs have increased by up to 20 hp.
Brake Energy Regeneration (iGR) uses an Intelligent Alternator Control (IAC) and an absorbent glass mat battery to reduce drag on the engine by only engaging when required to charge the battery, whereas a traditional alternator is always pulling power from the engine. Additionally, the energy generated by the engine on over-run (under braking or descending a hill) was previously wasted. Now this previously lost energy is utilized by the IAC to charge the battery. iGR alone is responsible for a three per cent improvement in fuel economy. (At NAIAS, BMW announced that iGR would be applied in the new 5 Series as well. Earlier post.)
The new 1 Series comes with an Automatic Start-Stop function to cut fuel consumption. Standard on all manual transmission models (except 130i), the system automatically switches the engine off when the vehicle is stationary and the driver puts the car into neutral. To restart the driver only need engage the clutch again before pulling away in the normal manner. The driver can choose to disable Automatic Start-Stop.
The use of Electric Power Steering results in a 90% energy saving compared to a conventional mechanical hydraulic steering system. Power assistance is now provided by an electric motor that works only when required, such as turning a corner. Other fuel saving enhancements have been made courtesy of various ancillary devices, such as the air-conditioning power supply being disconnected from the drivetrain when not in use. Even flaps behind the kidney grille improve economy, closing up for improved aerodynamic efficiency should the engine require less airflow. The feature also improves cold starting times.
Select new members of the 1 Series engine line-up include:
120i: New four-cylinder gasoline engine with High-Precision Direct Injection (gasoline direct injection) and Bi-VANOS technology. Output is 170 hp / 127 kW (up 20 hp) while peak torque is now 210 Nm / 155 lb-ft (up 10 Nm). Combined fuel consumption is 6.6 l/100km (37 mpg US) (improves by 17%), CO2 emissions are 152 g/km (down 16%).
118i: New four-cylinder gasoline engine with High-Precision Direct Injection and Bi-VANOS technology. Output is 143 hp / 107 kW (up 14 hp) while peak torque is now 190 Nm / 140 lb-ft (up 10 Nm). Combined fuel consumption is 5.9 l/100km (40 mpg US) (improves by 24%), CO2 emissions are 140 g/km (down 20.5%).
120d: Second generation common-rail diesel engine with aluminium crankcase with output of 177 hp / 132 kW (up 14 hp) while peak torque is 350 Nm / 258 lb-ft (up 10 Nm). Combined fuel consumption is 4.9 l/100km (48 mpg US) (improves by 16%) and CO2 emissions are 129 g/km (down 15.1%).
118d: Second generation common-rail diesel engine with aluminium crankcase achieves with output of 143 hp / 107 kW (up 21 hp) while peak torque is 300 Nm / 221 lb-ft (up 20 Nm). Combined fuel consumption is 4.7 l/100km (improves by 19%) and CO2 emissions are 123 g/km (down 18%).
Since its launch in September 2004, the BMW 1 Series has sold more than 200,000 units worldwide. The new three- and five-door BMW 1 Series models will be on display at the Geneva Motor Show in March.