First truly ingenious Stop/Start system headed for production. [xfloat=left]http://www.cleanmpg.com/photos/data/501/2009_European_Mazda3_with_i-stop.jpg[/xfloat]Wayne Gerdes – CleanMPG – Feb. 3, 2009 All-new 2010 European Mazda3 with the 2.0L DISI and i-stop. HIROSHIMA, Japan - Mazda did it! They will be debuting the all-new 2010 Mazda3 with i-stop, Mazda’s advanced fuel-saving start-stop system at the 2009 Geneva International Motor Show from March 3 through 15, 2009. The Mazda3 with i-stop embodies Sustainable Zoom-Zoom and adds a new eco-friendly option to the lineup. It features the i-stop system in combination with the MZR 2.0 DISI (Direct Injection Spark Ignition) engine. By providing great driving performance as well as top-class fuel economy, the Mazda3 with i-stop is a different type of eco-car that will exceed customer expectations. Mazda’s independently developed idle stop system called i-stop in conjunction with the DI-ICE, improves fuel economy by up to twelve percent in urban areas where vehicles frequently stop at traffic lights or in heavy traffic during operation. The i-stop system uses a unique method of direct injection technology to restart the engine. As with any hybrid vehicle, idle stop systems save fuel by shutting down the engine automatically when the car is stationary, and restarts it when the driver wants to resume driving. Conventional hybrid stop/start systems restart a vehicle’s engine with an electric motor using exactly the same process as when the engine is started normally. Mazda’s i-stop system initiates engine restart by injecting fuel directly into the cylinder while the engine is stopped, and igniting it to generate downward piston force. In order to restart the engine by combustion, the pistons must be stopped at exactly the correct position to create the right balance of air volume in each cylinder. The i-stop System provides precise control over the piston positions during engine shutdown to accomplish this. The system indexes each cylinder and initiates fuel injection before the engine begins to rotate. This enables the engine to be restarted in just 0.35 seconds, roughly half the time of a conventional electric motor idling stop system. In addition to saving fuel, Mazda’s Smart Idle Stop System ensures that the engine will restart quickly and with exactly the same timing every time. Mazda’s production ready i-stop Previous iterations of Mazda’s Idle-Stop system first rotated the engine backwards with an injection and light off in a far below top dead center (BTDC) cylinder to create a rising pressure via compression in an opposing cylinder, injecting fuel and lighting off the fuel/air mixture in the compressing second cylinder with rotation in the normal direction of rotation afterwards. The new design rotates the crank forward from the firing off the initiating cylinder with much less component stress as the crank rotation continues in the same direction from initial light off to standard idle.