How Does a Twin Spark Engine Work?

A digital twin spark ignition system, or DTSI, uses two spark plugs per cylinder instead of one. Having two spark plugs allows for a faster and more efficient combustion.

Having faster and more efficient combustion means better fuel economy and lowering emissions. The DTSI also uses a special hemispherical combustion chamber configuration and piston heads for a fast and wide flame when the air-fuel mixture is ignited. This means that there is less ignition advance, allowing a lean mixture to be used. This type of system could adjust idling speed and cut off fuel when the gas pedal is released. It can also measure the air-fuel mixture for cold starting and accelerating situations, and it also keeps the rev limit from being exceeded.

There are several advantages to this system, such as less vibration and noise, increased fuel economy, no over heating, increased thermal efficiency and longer life for engine parts. Better starting in the winter or cold climates is also a benefit made possible by the increased compression ratio. Since there are two sparks creating a wider and larger flame, the fuel is ignited faster and exerts more force on the piston, creating more work output.

There are a few disadvantages to this type of system though, such as high NOx emissions and higher cost. Additionally, if one plug needs replaced, then both need to be replaced.