Individual cylinder IMEP estimation based on two-dimensional graphical signature using crankshaft angular velocity measurements

The estimation technique for indicated pressure of internal combustion engine has been investigated for many years. In this paper, we propose a new method for individual indicated mean effective pressure (IMEP) estimation, using crankshaft angular velocity measurements as input. The method is based on a graphical signatures generation tool, recently proposed for diagnosis and parametric estimation of nonlinear systems. A two dimensional graphical signature is generated from measured angular velocity. It is shown that generated signature is correlated with the value of IMEP pressure and thus enables us to design an IMEP estimator. Experimental Data obtained on a four cylinder diesel engine test bench has been used for validation. The results are encouraging, indicating promise for real-time application.