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Effects and Models of Water Injection in an SI Engine

Downsizing and turbocharging is a popular combination nowadays in cars in order to decrease the fuel consumption. However, the boost pressure increases the risk of engine knock, limiting the engine in high-load operating points. In the current engines, fuel is used to cool the engine in these operating points, leading to a higher fuel consumption. Water injection is an effective method to mitigate knock and enable a more aggressive ignition. It enables the engine to produce more power and cools the exhaust, thereby protecting the turbocharger and the catalyst from wear. In this thesis, the effects of injecting water in an engine is investigated and a further development of a cylinder pressure model, with a model that takes the water into account, is presented and validated. The model can be used to estimate the cylinder pressure in several operating points.

Haris Subasic and Joel Westling


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Senast uppdaterad: 2019-03-29