This paper discusses the issues of measuring formaldehyde on rich burn natural gas engines typically used in the gas compression industry in the United States. Recently, the EPA passed the final rule for reciprocating internal combustion engines to meet the national emission standards for hazardous air pollutants (i.e. RICE NESHAP rule) for both compression ignition (CI) and spark ignited (SI) ...

Abstract Cylinder deactivation is well-known in spark-ignited (SI) engines and compression-ignited (CI) engines. The major reason why the efficiency of these decreased at part load due to flow restriction intake system caused by partially closing throttle valves, which causes increased pumping losses. In order resolve this issue, cylinder can be implemented SI with four cylinders developing a s...

The extremum seeking controller (ESC) that minimizes the unknown performance index is applied to the control of SI (spark ignition) engines in the idle speed region. The proposed control system consists in the three parts, fuel-jet mount controller, ignition-timing controller and engine speed controller. The ESC applied to the engine speed controller should be modified in order to improve the e...

Emissions from modern SI-engines are reduced by a three way catalyst. However if there are leaks in the exhaust system before the catalyst emissions increase for two reasons. First the untreated emissions leak out. Second which is worse, due to waves in the exhaust system, oxygen leaks into the manifold and causes an oxygen sensor offset. The result is increased emissions as the air/fuel contro...

The dual-fuel diesel engine (D.F.D.E) is a conventional diesel engine in which much of the energy released, hence power, comes from the combustion of gaseous fuel such as natural gas. The exhaust emission characteristics of the D.F.D.E needs further refinements, particularly in terms of reduction of Unburnt Hydrocarbons (U7HC) and Carbon Monoxide (CO) emission, because the concentration of thes...

Accurate AFR control with TWC is a significant method to reduce the exhaust emission of SI engines. To follow the up to date model-based methodology in automotive industries, a virtual engine simulation platform was carried out to simulate a SGMW B15 engine based on enDYNA and improved by adding the AFR path dynamic models. Experiments and simulation results were compared for the model validati...

The three phase catalyst is popularly employed in modern engines for exhaust control and its catalytic efficiency is determined by the Air-Fuel ratio (A/F). In this paper, individual A/F control problem is addressed for a multi-cylinder SI engine, of which one exhaust pipe is shared by many cylinders. Firstly, an overlap model to describe the dynamics from individual fuel injection to A/F value...