Trailer air suspension systems use an Electronic Control Unit (ECU) to monitor and regulate ride height during transit. The ECU adjusts suspension automatically to maintain the correct operating level.
Under normal conditions, the ECU is powered via the ISO 7638 (EBS) suzie line. If the driver does not complete a valid coupling, the ECU remains unpowered and several trailer safety functions become inactive, including suspension height control.
Without electrical power, suspension solenoids cannot adjust and the height sensor stays inactive. If the suspension has been manually raised before departure, such as during loading at a raised bay, it may remain elevated for the entire journey. This significantly increases the risk of bridge strike and may affect vehicle stability.
To address this, Don-Bur has developed 'Suspension-Safe' — a standalone, running-gear-mounted system that detects whether the suspension is above its intended ride height. If elevated, a forward-facing warning light activates. An optional 90dB siren can also be fitted to provide an audible alert.
The system operates from an independent rechargeable battery that charges via the primary electrical connection. A voltmeter indicates when charge levels fall below safe operating thresholds, ensuring the unit remains functional even when the ISO 7638 line is not correctly coupled.
Suspension-Safe is protected under GB Patent 2619121.
Don-Bur also provides EBS-Safe and EBS-Safe Braked, which alert when no valid ISO connection is detected.
FAQs
What does Suspension-Safe detect?
It identifies when the trailer suspension is above the intended ride height and activates a warning light, with an optional audible alert.
Why is incorrect ride height a risk?
Travelling with an elevated suspension height can increase the likelihood of bridge strikes and reduce vehicle stability.
Does Suspension-Safe rely on the tractor's electrical supply?
No. It runs on an independent rechargeable battery, ensuring operation even when the ISO 7638 line is not correctly coupled.
Is an audible warning included?
Yes, a 90dB siren can be added to supplement the visual warning light.
Is the system patented?
Yes, Suspension-Safe is protected under GB Patent 2619121.
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