Spark ignition natural gas engines—A review

An exhaust emission control device for an internal combustion engine, capable of supplying a just enough amount of reducing agent to a selective reduction catalyst even when a NOx purification ratio of the catalyst is changed by various causes, thereby enabling a high NOx purification ratio and very low exhaust emissions to be maintained. An ECU calculates a filtered value based on a signal from an exhaust gas concentration sensor, calculates a moving average value of a product of the filtered value and a reference input, calculates a control input such that the moving average value becomes equal to 0, and adds a reference input to the control input to calculate an FB injection amount. The ECU calculates an FF injection amount with a predetermined feedforward control algorithm, and adds the FF injection amount to the FB injection amount, to thereby calculate a urea injection amount.

Exhaust emission control device for internal combustion engine

Combustion, performance and emissions of a diesel engine with H2, CH4 and H2–CH4 addition

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Dual-Fuel Diesel Engines

Investigation of EGR Effect on Combustion and PM Emissions in a DISI Engine

Study on Lean Burn Gas Engine Using Pilot Oil as the Ignition Source

The Effect of NOx on Knock in Spark-ignition Engines

Study on Improvement of Natural Gas Fueled Spark Ignition Engines -Effect of EGR Utilization-

PROBLEM TO BE SOLVED: To be able to achieve stable operation by providing nitrogen oxides that promote auto-ignition, or ozone which reacts with the air and generates nitrogen oxides in the combustion chamber in a compression auto-ignition engine which auto-ignites and burns instantaneously in the combustion chamber. SOLUTION: During operation of an engine 10, the cylinder pressure in the engine 10 is detected by a pressure sensor P1. The timing of the auto-ignition is calculated in a control unit 26 based on the detected pressure, and it is determined whether or not the calculated auto-ignition timing is correct. Here, if the self-ignition timing is fast relative to the correct timing, the opening of an open/close valve V1 closes and the atmosphere of the combustion chamber BS should shift to one that makes auto-ignition difficult, reducing the supplied amount of NOx or ozone. On the other hand, if the auto-ignition timing is late relative to the correct timing, the opening of the open/close valve V1 widens so as to increase the amount of NOx or ozone generated. As a result, stable operation of a compression auto-ignition engine is ensured.

Tatsuo Sakonji

Papers

Study on Lean Burn Gas Engine Using Pilot Oil as the Ignition Source

The Effect of NOx on Knock in Spark-ignition Engines

Study on Improvement of Natural Gas Fueled Spark Ignition Engines -Effect of EGR Utilization-

Compression auto-ignition engine and the control means thereof

New Gas Mixer for Gas Engines - Optimized Air-Fuel Ratio with Negligible Pressure Loss