Trailer Antilock Braking System Using Preliminary Pressure Release
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Solution Overview
Problem
Conventional trailer ABS systems lead to undesired skidding and prolonged stopping times due to the release of brake pressure only after wheel cessation, resulting in tire wear and reduced control during braking events.
Innovation Solution
An antilock braking system (ABS) that independently modulates hydraulic pressure to each trailer wheel using wheel-speed sensors, a trailer in-cab controller, and an actuator controller, maintaining wheel speed synchronization with the tow vehicle to prevent skidding and optimize braking control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake pressure is released only after wheel cessation is detected, then the braking control system responds to wheel lockup, but the wheel skids on the road surface causing tire wear and prolonged stopping times
Solution Approach 1:
The system performs preliminary action by releasing brake pressure before the wheel completely stops rotating. The controller monitors wheel speed and releases pressure when rotation slows below a threshold, preventing the wheel from locking up and skidding in the first place, rather than waiting for cessation to occur and then responding.
Solution Approach 2:
The system uses feedback from wheel speed sensors to continuously monitor wheel rotation and dynamically adjust brake pressure. The controller receives real-time wheel speed information and modulates pressure accordingly, creating a closed-loop control system that prevents skidding by responding to changes in wheel speed before complete cessation occurs.
2Ease of operation
If brake pressure is released only after wheel cessation, then the braking system maintains simple control logic, but skidding occurs leading to tire wear and reduced control
Solution Approach 1:
The system performs preliminary action by releasing brake pressure before the wheel completely stops rotating. The controller monitors wheel speed and releases pressure when rotation slows below a threshold, preventing the wheel from locking up and skidding in the first place, rather than waiting for cessation to occur and then responding.
Solution Approach 2:
The system uses feedback from wheel speed sensors to continuously monitor wheel rotation and dynamically adjust brake pressure. The controller receives real-time wheel speed information and modulates pressure accordingly, creating a closed-loop control system that prevents skidding by responding to changes in wheel speed before complete cessation occurs.
3Device complexity
If conventional ABS systems release brake pressure only upon wheel cessation detection, then the system structure remains simple, but stopping distance increases and directional control deteriorates
Solution Approach 1:
The system performs preliminary action by releasing brake pressure before the wheel completely stops rotating. The controller monitors wheel speed and releases pressure when rotation slows below a threshold, preventing the wheel from locking up and skidding in the first place, rather than waiting for cessation to occur and then responding.
Solution Approach 2:
The system uses feedback from wheel speed sensors to continuously monitor wheel rotation and dynamically adjust brake pressure. The controller receives real-time wheel speed information and modulates pressure accordingly, creating a closed-loop control system that prevents skidding by responding to changes in wheel speed before complete cessation occurs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces stopping distances, minimizes tire wear, and enhances directional control by maintaining wheel speed synchronization, thereby improving braking performance and reducing skidding.
Implementation Method 1
wheel-speed sensors monitor the rotation of the trailer's wheels
Implementation Method 2
an actuator controller (TAC) that controls an electric-hydraulic trailer actuator, which generates a hydraulic pressure supply
Data Source
AI summary
An electric-hydraulic antilock braking system (ABS) installed in a trailer is coupled with a tow vehicle to facilitate controlled braking of the trailer. A trailer in-cab controller (TIC) monitors vehicle networks for diagnostic information used in determining appropriate braking actions to be taken. A communication network can interconnect the TIC, a trailer actuator controller (TAC), and an ABS controller. The ABS controller receives current tow vehicle speeds and current trailer wheel speeds, and dynamically adjusts the brakes based on the differences in the speeds. A three-way solenoid valve or an equivalent valve structure thereto allows for the ABS system to be quickly activated and deactivated.