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Abstract |
Increasing the Efficiency of SI-Engines by Spark Advance Control and Water Injection
Keywords By directly measuring in-cylinder parameters and adjusting the spark
advance, the engine efficiency can be maximized. A feedback scheme for
spark-advance control using the ionization current as sensed variable has
earlier been presented. One issue is to verify that the algorithm works when the
environmental conditions changes the burn rate. Humidity significantly affects
the burn rate and active water injection is used to slow down the combustion
giving a peak pressure position (PPP) that occurs too late. The ionization
current based feedback-scheme adjusts the spark advance, and moves the PPP back
to optimum. An additional result is that the engine efficiency can be increased
by combining active supply of water to the combustion and the spark-advance
control scheme.
Lars Eriksson
1997
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Senast uppdaterad: 2021-11-10
