A Three-Position Solenoid for an EVAP System

TLX Technologies designed a three-position push/pull solenoid for an automotive OEMs’ charcoal canister vent valve.

Customer Problem

Sealed automotive fuel tanks use an evaporative emission control (EVAP) system to comply with emissions standards. When the engine is not running, fuel vapors are absorbed and stored in a charcoal canister instead of being vented to the atmosphere. Once the engine starts, the vapors are purged into the engine’s intake manifold to be burned off during combustion. A manufacturer needed a solution to open and close the charcoal canister vent valve.

The TLX Solution

TLX Technologies designed a three-position push/pull solenoid to actuate the charcoal canister vent valve. The first position closed the valve during refueling. The second position allowed fuel vapors to purge directly to the intake manifold while the engine was running. The third position routed fuel vapors into the charcoal canister while the engine was turned off. This durable solenoid had a lifespan of more than 10 million cycles.

View Design Solution

Three-Position Push/Pull Solenoid

Stroke from center position: 1.58 to 25.4 mm
Push/pull force: 0.29 to 44.13 N
Supply voltage: 3 to 48 Vdc
Duty rating (%ED): 100%
Operating temperature range: -40°C to 120°C (-40°F to 248°F)
Durability: > 10M cycles

All TLX components are customized to fit system requirements, meaning technical specifications are unique to each customer and design. Examples given on our website are for illustration purposes only.

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Step 1 / Initial Review

Our engineering team works directly with you to determine the viability of your program and identify the best solution based on your specifications.

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Step 3 / Design Review & Prototypes

Our engineering team reviews the design with you and makes any adjustments needed. Prototypes are built according to design specifications for testing.