[:: CarEcstasy - Car Technical - SISS Information ::]
Advertisments
[ Latest News ]
[ Car Specific ]
[ Audio ]

[0-9] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y] [Z]


Back
Illustrated: Mazda's Smart Idling Stop System
Illustrated: Mazda's Smart Idling Stop System
SISS: Smart Idling Stop System - (Mazda Tech) An internal combustion engine that is outfitted with idle-stop technology can save fuel by shutting down the engine when the vehicle stops, and nearly instantly restarting it when the driver takes his foot off the brake pedal.

Such technology is common on hybrid cars, but it is starting to appear on non-hybrids too. Usually, it is an electrical motor that restarts the engine by acting like an oversized starter motor.

Mazda has developed another way to stop & start an engine: With direct injection technology, fuel is injected directly into the cylinder while the engine is stationary and then ignited to create the downward force necessary to restart the engine (it is actually a bit more complicated than that to get the cylinders in the right position, but that's the general idea). "Mazda claims that the Smart Idling Stop System is more energy-efficient than an electric motor restart, and also restarts the engine more quickly and quietly than a conventional idle-stop system.
1. The system injects a small amount of fuel into the cylinder whose piston is part-way through its compression stroke and ignites it, causing the engine to run slightly in reverse.
2. The system then injects fuel into the cylinder that has begun to undergo compression owing to the engine’s reverse operation.
3. Finally, the system ignites the latterly injected fuel, causing powerful expansion that drives the engine in the forward direction, thereby starting the engine.

For this to work, the compression-stroke piston and expansion-stroke piston must be stopped in positions that create the right balance of air volumes. Consequently, the Smart Idling Stop System effects precise control over the piston positions during engine shutdown.
:: Recommended Reading / Videos ::
:: Recommended material containing aditional info about SISS ::
:: Copyright 2003 - 2012 CarEcstasy.com / All rights reserved ::