Silly Question of ECO Mode
Thread Starter
Junior Member
Joined: Apr 2015
Posts: 68
Likes: 5
From: Charlton, MA
2016 E400 Coupe Mars Red
Silly Question of ECO Mode
When I picked up my E400 from the dealer the guy who showed me all my new toys told me that Mercedes' start/stop feature was done differently than most companies. Rather than spin up the starter motor they fire off the cylinder that's at top dead center. I thought, how cool. But yesterday I had a passenger who commented on the feature and I told him what I had been told by the dealer and he called BS on that. He said they use the starter motor just like all car companies do.
Anyone know which is true..?
Anyone know which is true..?
Thread Starter
Junior Member
Joined: Apr 2015
Posts: 68
Likes: 5
From: Charlton, MA
2016 E400 Coupe Mars Red
Found this after a few Google searches -
Those quick, smooth restarts begin with what’s called a crankshaft Hall sensor. It identifies the rotational direction of the crankshaft, enabling the engine control unit to identify the cylinder in which the piston is ideally positioned for starting. Fuel is injected into this cylinder first, thereby speeding up the starting process.
At the same time, an additional electric transmission oil pump supplies the clutches of the automatic transmission with oil pressure prior to starting. This preps the transmission for a quick take off after the engine starts.
The starter motor has been beefed up to cope with eight times as many starting procedures and, an additional 12-volt absorbed glass matt battery supports the on-board electrical system when the engine shuts down.
So I guess both are true....!
Those quick, smooth restarts begin with what’s called a crankshaft Hall sensor. It identifies the rotational direction of the crankshaft, enabling the engine control unit to identify the cylinder in which the piston is ideally positioned for starting. Fuel is injected into this cylinder first, thereby speeding up the starting process.
At the same time, an additional electric transmission oil pump supplies the clutches of the automatic transmission with oil pressure prior to starting. This preps the transmission for a quick take off after the engine starts.
The starter motor has been beefed up to cope with eight times as many starting procedures and, an additional 12-volt absorbed glass matt battery supports the on-board electrical system when the engine shuts down.
So I guess both are true....!
