Estimating exhaust manifold pressure in a turbocharged diesel engine

The problem of estimating the exhaust manifold pressure in a turbocharged diesel engine is considered. The reciprocated engine causes the air-flow in the exhaust manifold to oscillate with a frequency that is a multiple of the engine speed. As a result of the oscillating airflow the pressure in the exhaust manifold will also oscillate. This oscillation makes it difficult and expensive to measure the pressure. Instead an observer for the exhaust manifold pressure is proposed. The observer is model-based, and the performance of the observer is evaluated by simulations.