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Bosch start-stop systems reduce consumption, emissions

BMW system featuring Bosch starter to begin series production in March
Farmington Hills, Mich. – Bosch’s Smart Electronic stop-start system will begin production at BMW in March 2007, with first variants of the BMW 1-series featuring the start-stop system as standard equipment. The start-stop system switches off a vehicle’s engine in stationary situations, such as traffic jams or stop lights.

Bosch supplies the key component for this system: a starter that has been developed specifically for stop-start applications. The starter switches the engine off when the vehicle is stationary and starts it again as soon as the driver wishes to accelerate. During each trip, the Bosch system reduces fuel consumption and carbon dioxide (CO2) emissions by as much as eight percent, depending on the vehicle. If the stops last longer, the actual saving of CO2 emissions and fuel can be significantly higher.

For Bosch, increasing fuel prices and stricter emissions standards call for innovative solutions. The Bosch Smart Electronic start-stop system is a cost-effective way of conserving resources and protecting the environment.

“This technology significantly reduces fuel consumption, especially in city driving," said Dr. Volkmar Denner, member of the Bosch board of management. "This and other systems supplied by Bosch will help to reduce CO2 emissions further in the future."

The company already produces the battery sensor that detects the battery's current charge and communicates this information via the energy management system.

"Bosch has drawn on its combined competence in drive trains, energy management, and starter technology to develop this system and its control function," said Denner.

With the Bosch system there is no need for any further adjustments to the drive train or engine. The number of engine starts the starter has to make has been significantly increased for this application. In addition, the starter's improved-performance electric motor, and a low-noise, stronger pinion-engaging mechanism ensure that the engine starts reliably, quickly, and quietly.

The Bosch Group is a leading global manufacturer of automotive and industrial technology, consumer goods, and building technology. In fiscal 2006, approximately 260,000 associates generated sales of 43.7 billion euros, or $54.9 billion USD. Set up in Stuttgart in 1886 by Robert Bosch (1861-1942) as "Workshop for Precision Mechanics and Electrical Engineering," the Bosch Group today comprises a manufacturing, sales, and after-sales service network of approximately 280 subsidiaries and more than 12,000 service centers in over 140 countries.

In North America, the Bosch Group manufactures and markets automotive original equipment and aftermarket products, industrial automation and mobile products, power tools and accessories, security technology, thermo-technology, packaging equipment and household appliances. Bosch employs 24,750 associates in more than 80 primary and 20 associated facilities throughout the region with reported sales of $8.8 billion in 2006. For more information on the company, visit


Start-Stop Release - March 2007


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