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Emissions Control Systems Article
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How The Emissions Control Canister Works
from:The emissions control canister contains charcoal and is designed to prevent the gasoline vapors emitted by the gasoline in the fuel tank of automobiles from entering the atmosphere. The emissions control canister is mounted in a non-conspicuous, safe place, usually in one of the rear wheel wells. When the car’s engine is not running the gasses radiating from the gasoline in the fuel tank are stored in the emissions control canister. The vapors are stored within this charcoal filled canister to be purged and burned when the running engine has reached certain predefined conditions. The emissions control canister in some automobiles will store any liquid fuel that has entered the canister in a reservoir designed into the bottom of the canister. The liquid fuel is stored in a separate reservoir to protect the integrity of the charcoal contained in the main emissions control canister housing.
There are three control methods used to purge the vapors from the emissions control canister, the first of which is controlled by the throttle’s position without a valve on the canister. A throttle body system may have a vacuum connecting the canister to a ported vacuum source designed as part of the throttle body. At any level higher than idle, the throttle may be positioned in will fresh air will be pushed into the emissions control canister. When the fresh air is added to the canister, it causes the fuel vapors to be purged into the throttle body through the port at a constant rate.
The second control method is by a vacuum valve that modulates the flow, also by throttle position. A diaphragm valve on the top of the canister opens when the vacuum ported from the throttle body opens it. When this valve is opened oxygen and fuel vapors are drawn into the intake manifold normally through the same port used to control the PCV system. The valve cycle under this control cycle is considered to be “slaved” to the throttle. The more you open the throttle the more the emissions control canister is purged.
The last of the three control methods is when the ECM activates a solenoid valve on the emissions control canister. This control method may be used only when the following pre-determined conditions are reached: The engine is within normal operating temperature, the engine has been running for a pre-determined amount of time, the vehicle speed has exceeded a predetermined rate and the throttle is open more than a predetermined level. As the solenoid is activated, full vacuum is applied from the manifold to the diaphragm of the purge valve, opening it completely. When the diaphragm fully opens the valve, fresh air rushes into the canister at a high rate, quickly purging the fuel vapors. When this happens, the ECM solenoid valve on the emissions control canister purges the canister.
Emissions Control Systems Specific links
Emissions Control Systems News
India May Ban European Airlines on EU Emission Rules - Wall Street Journal
 Moneycontrol.com | India May Ban European Airlines on EU Emission Rules Wall Street Journal By NIKHIL GULATI NEW DELHI – India may ban European carriers from flying into the country if the European Union includes airlines in its emissions control system, a senior Indian government official said Friday. "We will take retaliatory actions to ... European airline leaders criticize EU lethargy |
FEDERAL-MOGUL EXHAUST SLEEVING PROVIDES CUSTOMIZABLE FLEXIBLE DESIGN TO ... - Reuters
FEDERAL-MOGUL EXHAUST SLEEVING PROVIDES CUSTOMIZABLE FLEXIBLE DESIGN TO ... Reuters Federal-Mogul's Thermflex insulating sleeve traps heat within the exhaust system, allowing for greater efficiency of the emissions control systems. The Thermflex product line is constructed with basalt yarns, designed to withstand temperatures up to ... |
Clean Diesel Technologies, Inc. to Supply over $1.0 Million in Emission ... - MarketWatch (press release)
Clean Diesel Technologies, Inc. to Supply over $1.0 Million in Emission ... MarketWatch (press release) VENTURA, Calif., May 10, 2012 /PRNewswire via COMTEX/ -- Clean Diesel Technologies, Inc. (UTD:CDTI) ("Clean Diesel"), a cleantech emissions control company, announced today that its Heavy Duty Diesel Systems division has received orders in excess of ... More Than 100 School Buses in Texas to Be Retrofitted With Emissions Control ... Clean Diesel Tech loss wider than expected, shares fall Clean Diesel Co. Inks Huge Contract |
Tight belt causes strain - Chicago Tribune
 Chicago Tribune | Tight belt causes strain Chicago Tribune Auto Zone categorized the code as part of the emission control system. Nissan wants $116 to tell me what is wrong and will credit the amount towards repair. Our local mechanic used the Auto Zone printout to trace the cause which is a part costing $140 ... |
BC scraps AirCare vehicle inspection program - Yahoo! News Canada (blog)
 Yahoo! News Canada (blog) | BC scraps AirCare vehicle inspection program Yahoo! News Canada (blog) By Steve Mertl By Steve Mertl | Daily Brew – 12 hours ago The British Columbia government is phasing out its two-decade-old AirCare program, which forces Vancouver-area drivers to pay to get their vehicles' emission-control systems inspected regularly. Province to scrap AirCare for regular vehicles |