Closed-Loop Combustion Control for a 6-Cylinder Port-Injected Natural-gas Engine

Glow Plug Integrated Cylinder Pressure Sensor for Closed Loop Engine Control

The PressureSense Glow Plug combines a miniature fiber optic-based cylinder pressure sensor with the automotive glow plug. The 1.7mm diameter sensor is sealed inside a glow plug heater and the sensor signal conditioner is encapsulated into a “smart connector”. The sensor operates on the proven principle of light intensity changes, transmitted by two optical fibers, upon reflection from a deflec...

Reformer Gas Application in Combustion Onset Control of HCCI Engine

Homogenous charge compression ignition (HCCI) combustion is spontaneous multi-site combustion of a nominally premixed air/fuel mixture that exhibits high rate of pressure rise and short combustion duration. To avoid excessive pressure rise rate and knocking, HCCI engines are fueled with highly diluted mixture using a combination of excess air and/or EGR. HCCI combustion is attractive due to ...

Investigation of Correlations Between COV of Ion Integral and COV of IMEP in a Port-Injected Natural-Gas Engine

Correlations between the coefficient of variations (COV) of ion current integrals and COV of indicated mean effective pressure (IMEP) are investigated. The investigations are made to see if there is a possibility to use ion sense technique for closed loop combustion control to maximize Exhaust Gas Recirculation (EGR) level with remaining combustion stability. The engine studied in this thesis i...

Advanced Sensors for Real-time Control of Advanced Natural- Gas Reciprocating Engine Combustion

The First and Second Law Analyses of a Port-injected, Spark Ignition Engine Fuelled with Compressed Natural Gas

Availability changes with crank angle at the optimum engine operating point of 4000 rpm and WOT for CNG fuelling, CNG and gasoline engine operations at optimal engine conditions with the equivalence ratio Φ = 1.1, distribution of fuel availability of CNG and gasoline fuelled engine at equivalence ratio of Φ = 1.1, entropytemperature diagram for the engine optimal operating point and CNG fuellin...