Transient Engine Cylinder Charge Model on Crank-angle Domain

The engine model development is the core and basis of engine control system. This paper presents a transient cylinder charge model for engine based on crank-angle domain. An apparent expression of the amendatory coefficient k, which is used to estimates the transient cylinder charge m_a, is given. It is also concluded that the k is decided by values of (P_ms - P_m) and (m_as - m_a) , P_ms and P_m is steady and transient intake manifold pressure respectively, m_as is steady cylinder charge. Results of experiments denote that the model can estimate transient changes of the cylinder charge accurately, and the precision can satisfy the request of real requirements