Emission Control of a Propane Fueled Small Utility Engine Utilizing Air/Fuel Ratio Control and Three-Way Catalyst

1993 ◽  
Author(s):  
Daniel J. Luhman
Keyword(s):  
Emission Control ◽  
Fuel Ratio ◽  
Three Way Catalyst

Measurements of in-cylinder mixture strength and fuel accumulation in the inlet port of a gasoline - injected engine during very rapid throttle openings

1998 ◽  
Vol 212 (2) ◽  
pp. 103-118 ◽  
Author(s):  
N Ladommatos ◽  
D Rose
Keyword(s):  
Engine Speed ◽  
Gasoline Engine ◽  
Fuel Injection ◽  
Spark Ignition Engine ◽  
Fuel Injectors ◽  
Inlet Port ◽  
Fuel Ratio ◽  
Fuel Accumulation ◽  
Engine Coolant ◽  
Three Way Catalyst

The mixture strength in a cylinder of a port-injected gasoline engine was monitored continuously during very rapid throttle openings. The data on mixture strength were combined with other engine data collected in order to obtain for each successive engine cycle: the air—fuel ratio within the cylinder and the change in the fuel mass accumulating on the inlet port of the cylinder being monitored. The four-cylinder spark-ignition engine used had a displacement of 1.6 litre, four valves per cylinder and multipoint sequential fuel injection controlled by an electronic management system programmed for three - way catalyst operation. All tests were conducted with the engine coolant at the temperature of 90°C and at a constant engine speed of 2000 r/min. The engine transient involved very rapid throttle openings which were completed within about 15 ms. Small and large throttle openings were investigated along with the effect of altering the type and condition of the fuel injectors. The engine response to the fast throttle opening comprised a sharp rise in the air—fuel ratio (maximum gravimetric air—fuel ratio of around 25:1) which lasted for only a single cycle, followed by a drop in the air-fuel ratio (minimum air—fuel ratio of about 10:1) and, subsequently, a gradual rise towards a stoichiometric air—fuel ratio within about 10 engine cycles.

A Carbon/Iron–Cerium/Alumina Catalyst as Potential Substitution for Noble Metal Three-way Catalyst for Auto Emission Control

2013 ◽  
Vol 42 (3) ◽  
pp. 258-260 ◽  
Author(s):  
Yu Guo ◽  
Harunobu Oda ◽  
Lu Jia ◽  
Shuntaro Amari ◽  
Yui Okita ◽  
...  
Keyword(s):  
Noble Metal ◽  
Emission Control ◽  
Alumina Catalyst ◽  
Carbon Iron ◽  
Three Way Catalyst

Air-to-fuel Ratio Modulation Experiments over a Pd/Rh Three-way Catalyst

2001 ◽  
Author(s):  
Stephen J. Cornelius ◽  
Nick Collings ◽  
Keith Glover ◽  
Daniel E. Davison
Keyword(s):  
Fuel Ratio ◽  
Three Way Catalyst

Relationship between Backpressure and Light-Off Characteristic of the Three-Way Catalyst

2010 ◽  
Vol 177 ◽  
pp. 682-685
Author(s):  
Xiao Kun He ◽  
Jin Hu ◽  
Yong Bo Ji ◽  
Wen Yong Yang ◽  
Jia Lin Sun
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Cell Shape ◽  
Experimental Results ◽  
Negative Effects ◽  
Fuel Ratio ◽  
Simulating Calculation ◽  
Bench Experiment ◽  
Three Way Catalyst

The three-way catalyst with different cell shape substrates was prepared by the different washcoat loadings. Its catalyst’s light-off characteristics were investigated by the simulating calculation and the engine bench experiment. The experimental results showed that, heat transfer coefficient (Hs) couldn’t be improved by the increase of coating rate, in contrast heat transfer coefficient (Hs) and the catalytic conversion decreased when the coating rate was more than 45%. Therefore, it had some negative effects on the light-off characteristics and air-fuel ratio property. The calculation analyses and the engine bench experiment also proved that the best coating rate was 45% for the substrate of 400cpsi.

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