Electronic anti-lock trailer braking system

摘要

Disclosed is an antilock braking system for trailers equipped with electric brakes. A control module captures wheel speed data, analyzes it, and determines if wheel slip is occurring. Braking signal to the trailer wheels is reduced using pulse width modulation techniques to reduce the braking force as necessary to eliminate wheel slip. A particular system uses a central microprocessor, two hall-effect speed sensors, and three solid state relays for isolation and control. The ABS works in conjunction with an existing trailer brake controller installed in the tow vehicle.

主权项

1. An electronic anti-lock brake controller for a trailer towed by a vehicle, comprising:
a trailer brake signal input structured to accept a braking input signal; at least two wheel speed sensors, each sensor structured to generate a signal related to a speed of a respective wheel of the trailer; a comparator structured to compare individual speeds from the wheel speed sensors to one another, and then compare a difference in wheel speed to a difference threshold; a controller structured to generate a reduced brake signal; and a brake signal interrupt structured to supply the reduced brake signal instead of the braking input signal to a slowest of the wheels of the trailer, while continuing to supply the braking input signal to at least one of the other wheels of the trailer, the selection based on a comparator output.