Output details

Burn angles and form factors for Wiebe function fits to mass fraction burned curves of a spark ignition engine with variable valve timing

Straightforward combustion modelling is essential requirement for simulation and control of modern, complex spark ignition engine architectures. Zero-dimensional models, such as the Wiebe function, promise measurable improvements in fuel efficiency when deployed within fast-execution control algorithms, e.g. for continuous ignition optimisation. This paper, developed in association with Jaguar UK, presents the development of empirical correlations for burn rate modelling using the Wiebe function. The model has broad applicability as it is derived using a common pentroof engine, featuring variable valve actuation technology, across wide ranges of operating conditions. New proposed correlations have been embedded in the work of several researchers.