ECO start/stop function

The ECO start/stop function developed by Mercedes Benz reduces fuel consumption and emissions by switching off the engine when the vehicle comes to a standstill (e.g. at traffic lights).

The engine restarts as soon as the driver's foot comes off the brake pedal.The intelligent ECO start/stop function adapts itself to the current driving scenario. It is linked to the air conditioner, for example, and is suspended as soon as the vehicle’s interior temperature drops below a certain threshold.

Using manoeuvring detection, the ECO start/stop function is also turned off when the driver is parking the vehicle. A switch in the cockpit can deactivate the function completely at any time.

Reducing fuel consumption.



Detailed information


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In manual transmission vehicles, the engine is switched off automatically when coasting to a stop (once the road speed drops below 8 km/h), the driver brakes and the gear lever is in neutral. If the driver engages the clutch pedal, the engine is started again. If the vehicle is equipped with an automatic transmission, it must be brought to a complete standstill before the engine is switched off. The engine restarts as soon as the driver's foot comes off the brake pedal.


Under certain conditions, some vehicles with the ECO start/stop function are also equipped with an additional starter-alternator, which is activated instead of a starter.This starts the engine much more quietly and more smoothly than a conventional starter, which is why it is ideal for operation with ECO start/stop. Using intelligent control electronics, the starter-alternator also supplies electrical energy for the on-board electrical system.


The ECO display in the instrument cluster shows when the function is active and the vehicle has come to a standstill. A faster response when starting and improved integration compared with competitor systems make for longer phases when the engine is stopped and quieter system operation.
In practice, the ECO start/stop function can help achieve fuel savings, particularly in city traffic with a high number of traffic lights or traffic jams.


Vehicle availability

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