Start-stop reduces emissions and fuel consumption
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Bosch Rexroth - Electric Drives and Controls product story
Edited by the Engineeringtalk editorial team
Sep 4, 2009
One million vehicles have now been fitted with Bosch's start-stop technology since production began in 2007.
On the New European Driving Cycle (NEDC), start-stop systems reduce fuel consumption and CO2 emissions by up to five per cent, while the saving is as much as eight per cent on the NEDC urban cycle.
While only five per cent of all new vehicles in Europe were equipped with start-stop systems in 2008, Bosch predicts that this will increase to 50 per cent by 2012.
The Bosch start-stop system features in models made by BMW, Mini, Fiat, Kia and Volkswagen, among others.
Start-stop systems stop the engine when the vehicle comes to a halt, for example at a red light or in a traffic jam, starting it again automatically when the clutch is depressed and the vehicle is put back into gear.
The Bosch system features a powerful electric starter motor, as well as enhanced meshing mechanics, which guarantee a safe, fast and quiet engine start.
The system also includes control software, which is generally integrated into the engine ECU, and a battery sensor, which records the current battery charge and relays this information to the energy-management system.
This ensures the engine is only stopped if the battery has stored enough energy to start the engine again quickly.
The system also features sensors on the crankshaft and pedals, as well as a deep-cycle resistant battery.
For the most seamless start-stop operation, Bosch is also offering a new series of alternators.
Models in the 'Efficiency Line' (EL) feature improved electrical design and new diodes and are up to 77 per cent efficient.
In addition, these alternators ensure that the battery is well charged even when the engine is idling or running at low revolutions.
Combining the Bosch start-stop system with an EL-series alternator can reduce fuel consumption and CO2 emissions in urban driving by as much as 10 per cent.
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Contact Bosch Rexroth - Electric Drives and Controls
Tel +44 1285 863000
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