A novel approach to the estimation of equivalence ratio in spark-ignited internal combustion engines is proposed, based on a certain cycle-by-cycle statistical analysis of indicated cylinder pressure data. A classical (“zero-dimensional”) first law cylinder pressure thermodynamic model is re-parameterized into a difference equation in which crank-angle is the independent variable, and parameters in the combustion model are estimated from observation of cylinder pressure alone. An efficient algorithm based on statistical maximum-likelihood techniques is derived to produce estimates of combustion duration, ignition delay, and total heat released on a cycle-by-cycle basis. It is then shown that the statistical signature of the estimated parameters (combustion duration in particular) can be exploited to develop a Bayesian estimator for equivalence ratio. Experimental results from a CFR engine are presented together with potential simplifications to the required data processing requirements.
Estimation of Fuel-Air Ratio from Cylinder Pressure in Spark Ignited Engines
Sae Technical Papers
SAE International Congress and Exposition ; 1983
1983-02-01
Aufsatz (Konferenz)
Englisch
Estimation of fuel/air ratio from cylinder pressure on spark- ignited engines
Kraftfahrwesen | 1983
|Estimation of fuel-air ratio from cylinders pressure in spark ignited engines
Kraftfahrwesen | 1983
|FUEL INJECTION for Spark-Ignited Automotive Engines
SAE Technical Papers | 1949
|Combustion pressure sensor for diesel, spark-ignited engines
Kraftfahrwesen | 1996
|Spark-ignited engines from Uni Diesel
Kraftfahrwesen | 1987
|