|A specially adapted starter is the central component of the Bosch Smart Electronic Start-Stop System.|
Bosch has developed a Smart Electronic Start-Stop System that is moving into series production at BMW. First variants of the 1-Series will feature it as standard equipment from 1 March 2007.
The Bosch system switches the engine off when the vehicle is stationary, and starts it again automatically as soon as the driver indicates an intention to move off—by depressing the clutch pedal, for example.
The ECE15 measuring cycle, the urban component of the New European Driving Cycle (NEDC), calls for twelve 15 second stops over a distance of seven kilometers. During such a journey, the Bosch system reduces fuel consumption and 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.
Bosch developers designed a specially adapted starter for the system, the Smart Starter Motor. The company already produces the battery sensor that is needed to detect the battery’s current state of charge and to communicate this information via the energy management system.
There is no need for any further adjustments to the drive train or the engine. This gives the system an excellent cost-benefit ratio, and makes it attractive compared with alternative systems.
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. Despite the increased number of functions, the starter is compact, and can be integrated into the vehicle just as easily and quickly as other starters.