• May 23, 2006
Autocar reports that BMW plans to launch its Automatic Engine Start/Stop System next year - one of the fuel economy and emissions reduction components of its "Efficient Dynamics" technology package, as the company aims to meet its commitment to the European Association of Automobile Manufacturers 2008 CO2 emissions reduction targets.

Officially called "Auto Start/Stop," the system automatically switches off the engine when the car comes to a standstill. As soon as the driver puts in the clutch or depresses the gas pedal, the engine restarts automatically. BMW's "Intelligent Software" links together the various sensors required with the starter motor and the alternator control to make the process work.

Auto Start/Stop, along with BMW's High Precision Injection (lean-burn direct injection) and Brake Energy Regeneration technologies, will appear across a broad model range, with the Start/Stop technology to be introduced in four- and six-cylinder 1-, 3- and 5-Series models.

[Sources: BMW, Autocar]


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  • 62 Comments
      • 8 Years Ago
      Alex -- "This sounds about as cool as Chevy's 1st-to-4th shift thing on the Corvette."

      It's called skipshift, and it's mandated by the EPA on all six-speed vehicles. It doesn't take long to get used to it (ironically, the "solution" is to just rev higher before the upshift, thereby using more fuel). But if you really can't train yourself, it's easy to defeat with a 5 cent resistor from Radio Shack, some electrical tape, and about two minutes under your car. Search Google.
      Dan Colon
      • 8 Years Ago
      What is the BMW warranty on the starter motor and how much does it cost to replace when it fails.If you stop your BMW 20 times an hour and drive 4 hours per day times 365 days per year times 10 years , I want to supply starter motors to BMW. GOOD LUCK
      RAYMOND LAMM
      • 8 Years Ago
      HOW WOULD YOUR A/C SYSTEM WORK WHEN ENGINE IS OFF
      • 8 Years Ago
      BMW could go fully electric AC(waiting on 42 volt system), or have a dual input system like the Accord Hybrid-Lite. Honda has a 15cc electrically driven compressor and a 75cc engine belt driven.

      BMW already has an electric coolant pump on the N52 engines.

      Didn't mazda just make a engine starting system that fires the engine backwards (a little) to get the engine moving forward(requires a slightly modified cam drive/tensioner)

      Mercedes-Benz gasoling hybrid-lite moves the car solely under electric power for 1 second.

      Maybe the ZF 7 speed automatic is in store for BMW.
      • 8 Years Ago
      Let me tell you how dumb this system is. My Accord Hybrid has a stop-start system and it turns the engine off at about 5 mph as you are braking to a stop, even if you never really come to a stop. When you lift your foot from the brake, the engine restarts. In real bumper-to-bumper traffic, the engine could be stopped and restarted many, many, many times. (Anyone see a problem here?)

      What I wind up doing in bumper-to-bumper traffic is selecting "low" gear and the stop-start system is disabled.
      Kayle
      • 8 Years Ago
      What happens when it shuts off??? Do you stil have air conditioning and radio?????
      • 8 Years Ago
      Gas driven golf carts have a delay after you step on the gas before they get going. Hybrids have an electric motor that kicks in to get you giong before the engine actually starts. I wonder how BMW will eliminate the delay caused by the engine starting. Perhaps as soon as you lift off the brake pedal, the engine starts. That should be enough time for a smooth transition.
      • 8 Years Ago
      When you couple this with the other ideas they're planning (direct injection, steam power or something besides the engine powering the ac,etc) You have to give them a lot of credit. If they can make a sporty car save 15% of its wasted fuel usage, what's not to like?
      '06Miatalover
      • 8 Years Ago
      RacetrackOwner--"it's mandated by the EPA on all six-speed vehicles." Maybe 6-speed gas hogs, but neither my '04 nor my'06 Miata with 6 speeds have any such thing. i can just haul ass as i wish AND get 28-30mpg. the skipshift is still a stupid gimmick and so will BMW's dumbass A.S.S. (thank you, dave). I should buy stock in the replacement starter company now.
      • 8 Years Ago
      If your engine idles @ 600 rpm, and the starter cranks @ 60 rpm (The throttle is closed for both) Starting uses 1/10 the gas per time (okay 1/7.5 because of starting enrichment) and it may only take 3 cylinders of firing to start a 6 cylinder engine, so 1 second and it is spinning.

      Seems odd coming from BMW, as they have valvetronic, and got ZF to add SBC to the ZF 6 speed autos
      GLENN MCCAMPBELL
      • 8 Years Ago
      what will keep the air conditoner going when the engine is not running
      Jeannine Liddle
      • 8 Years Ago
      It all sounds good,but I am not going to the guinne pig.
      When I see the yellow cabs legally having to use this method then I will believe it.
      Thats means alot of red tape and proof will be needed.
      And not just people like us that can afford a BMW.
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