PWM and Emissions Control

TLX Technologies developed a pulse-width-modulated proportional canister purge valve for a vehicle’s EVAP system.

Customer Problem

A motor vehicle manufacturer needed a valve for an EVAP system that would reduce the impact of vacuum purge on their smaller displacement engines to prevent the air/fuel mixture from being too rich at idle, which negatively impacts emissions. The valve needed to deliver proportional flow control and withstand the stresses of a vehicle-mounted component, such as vibration and exposure to moisture and debris.

The TLX Solution

TLX Technologies designed and produced a fully encapsulated solenoid valve that uses pulse width modulation (PWM) operating at 32 Hz to proportionally regulate vacuum purge flow and prevent the mixture from being too rich. The valve withstands vibrations as high as 20 G and resists contamination from debris and moisture. The design can be customized for lower operating frequencies if desired.

Canister Proportional Purge Solenoid Valve

View Design Solution

Proportional Canister Purge Valve

Flow rate range: 9-31 SLPM @ 50 kPa

Inductance: 25 ± 5 mH

Coil resistance at 20°C: 18.6 ± 1.8 Ω

Supply voltage: 12 Vdc @ 32 Hz PWM

Response time: < 8 ms

Operating temperature range: -40°C to 120°C

Vibration: 20 G

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.

Working with TLX

Experienced partner of industry leaders, first-tier suppliers, and OEMs
Direct access to our design and engineering team
Localized production in USA and China
Dependable single-source solution from design to delivery

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Our Process

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.

Step 2 / Quote

Quotes include all costs related to your project - tooling, prototype, piece part, production and project specific costs.

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.