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Internal combustion engine development is mainly driven by new emission regulations and fuel cost. The introduction of hybrid power trains allows the development of highly efficient non-traditional internal combustion engines. One way of increasing thermal efficiency while avoiding issues like high mechanical stress or knock, is to realize different expansion and compression strokes. Different solutions exist such as the Miller/Atkinson cycle or the five stroke engine. A 5-stroke turbo-charged port-injection spark-ignition engine has been developed in the present study for use as a range extender or series-hybrid main power source. Its development and design are based on 0D/1D model and experimental results have been compared with the engine model.

A new tool able to deliver the local in-cylinder equivalence air fuel ratio with high temporal CA resolution is presented for SI engines. Although non-intrusive laser techniques have considerable advantages, they are inappropriate for series engines application and other measurement techniques do not have a fast enough time response. The probe presented fullfills the demand for fast local air-fuel ratio measurement with a simpler device than fast FID. Mounted at the spark plug location, it allows a completely normal running of the engine as it is integrated in a spark plug. The probe is based on hot wire anemometry technique involving catalytic oxidation of hydrocarbons on the wire.