1. Necessity
Determination of engine condition. By measuring CO/HC, it is possible to determine the engine condition, including the effectiveness of the airfuel ratio, and the operation of the emission Read more CO/HC Inspection and Adjustment
Fuel Evaporative Emission Control (EVAP) System
1. Necessity
The Fuel Evaporative Emission Control (EVAP) System temporarily absorbs the evaporated gas in the charcoal canister and channels it to the engine for burning, in order to prevent the fuel, Read more Fuel Evaporative Emission Control (EVAP) System
Positive Crankcase Ventilation (PCV) System
1. Necessity
Blow-by gas includes a large amount of unburned gas, which leaks out from the gap between the piston ring and cylinder wall into the crankcase. The Positive Crankcase Ventilation (PCV) Read more Positive Crankcase Ventilation (PCV) System
Exhaust Gas Recirculation (EGR) System
1. Necessity
The Exhaust Gas Recirculation (EGR) System recirculates some of the exhaust gases to the intake air system. The flame propagation becomes slow during the combustion when the exhaust gases Read more Exhaust Gas Recirculation (EGR) System
Dash Pot (DP) System
1. Necessity
When the throttle valve closes at high engine speed, a strong vacuum is generated inside the intake manifold. Some of the fuel adhering to the internal walls of the manifold evaporates, Read more Dash Pot (DP) System
What is an Automotive Catalytic Converters?
Outline
The catalytic converter makes harmful substances (CO, HC and NOx) react chemically with harmless ones (H2O, CO2, N2) according to the exhaust gas passed. Generally platinum, palladium, iridium Read more What is an Automotive Catalytic Converters?
Automotive Emission Standards
Emission control regulations
There are various regulations for most countries around the world today to prevent the air pollutants by emission gases. These are called emission regulations. The measurement Read more Automotive Emission Standards
Principle of Production of Exhaust Gases
Theoretical Air-fuel Ratio
The theoretical air-fuel ratio is the ratio of the minimum amount of fuel and air (which contains oxygen) needed to fully burn the fuel. Gasoline is a mixture of several types Read more Principle of Production of Exhaust Gases
Engine Oil Cooler
It is best if the temperature of the engine oil does not rise above 100C. If the temperature rises above 125C however, engine oil lubrication properties will deteriorate suddenly. Therefore, to maintain Read more Engine Oil Cooler
Harmful Gases Produced by Automobiles
1. What is emission control system?
The emission control system reduces the emissions, which are harmful to the environment and human beings produced by automobiles.
2. What are emissions?