Three-Position Solenoid Helps Improve Vehicle Emissions
TLX designs solenoids that solve our customers' unique dilemmas. This is an example of how TLX ingenuity was applied in the field.
Sealed gas tanks in automobiles use fuel vapor recirculation as part of an their emissions system. When an engine is not in use, the recirculation system pulls fumes out of the gas tank and stores them in a charcoal canister. Once the engine starts, the system circulates the fumes back into the engine to be burned off.
An automotive company was looking for a solution to open and close the valve that vented fumes between the fuel tank and the charcoal canister. TLX designed an efficient, three-position solenoid that performed each function in the fuel vapor recirculation system.
The first position of the solenoid closed the vent valve while fueling the car. The second position allowed vapors to be transmitted directly to the engine for consumption. The third position helped divert vapors to the charcoal canister for storage. High push-pull force and compact solenoid design produced the fast response needed for each function, while consuming no power to hold in each position.
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