Trailer Brake Control via IMU and Wheel Speed Sensors
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Solution Overview
Problem
Towing vehicles, such as trailers and campers, experience instability and safety issues due to improper braking calibration, especially on uneven terrain and in adverse conditions, and are prone to theft.
Innovation Solution
A vehicle system with a control subsystem that includes a head unit in the towing vehicle and a tail unit in the trailer, utilizing Inertial Measurement Units (IMUs), wheel speed sensors, and a Tire-Pressure Monitoring System (TPMS) to independently control the trailer's brakes, monitor tire pressure, and detect potential theft, providing features like auto-braking, stability control, and anti-theft detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional braking systems are used without independent wheel control, then the system is simple and easy to operate, but the trailer experiences instability, jackknifing, and wheel lockup on uneven terrain
Solution Approach 1:
The braking system is segmented into independently controllable wheel brakes, with each wheel equipped with its own brake actuator. This allows individual wheel speed control through the controller, preventing wheel lockup and improving stability on uneven terrain while maintaining system simplicity through modular design
Solution Approach 2:
Wheel speed sensors provide real-time feedback on the rotational speed of each trailer wheel to the controller. The controller processes this feedback and adjusts brake application accordingly, preventing wheel lockup and maintaining towing stability through continuous monitoring and adjustment
2Adaptability or versatility
If standard brake calibration is used on level ground, then the braking system is easy to calibrate, but it becomes ineffective on steep inclines and in snowy conditions
Solution Approach 1:
The brake calibration is made dynamic and adaptive rather than fixed. The controller continuously monitors wheel speed and adjusts brake force in real-time based on actual operating conditions, allowing the system to adapt to steep inclines, snowy conditions, and varying loads without complex pre-calibration procedures
Solution Approach 2:
The system performs self-calibration by monitoring wheel speed feedback and automatically adjusting brake application characteristics. The controller learns optimal brake forces for different conditions through continuous operation, eliminating the need for manual recalibration on different terrains
3Reliability
If individual wheel brake control is implemented, then wheel lockup is prevented and stability is improved, but the device complexity and cost increase
Solution Approach 1:
The controller performs multiple functions including wheel speed monitoring, brake force modulation, stability control, and anti-lock braking through a single integrated unit. This multi-functionality reduces overall system complexity despite implementing individual wheel control, as one controller replaces what would otherwise require multiple separate systems
Solution Approach 2:
The controller acts as an intermediary between the wheel speed sensors and the brake actuators, processing sensor data and translating it into appropriate brake force commands. This intermediary function simplifies the control architecture by centralizing the control logic in one device rather than requiring complex direct coupling between sensors and actuators
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
The system enhances safety by reducing the risk of jackknifing and skidding, improves towing stability on various terrains, and provides effective anti-theft measures to secure the trailer.
Implementation Method 1
the head unit includes a head Inertial Measurement Unit ('IMU') for measuring orientation and acceleration of the head vehicle, and the tail unit includes a tail IMU for measuring orientation and acceleration of the tail vehicle
Implementation Method 2
The tail unit further has wheel speed sensors and a Tire-Pressure Monitoring System ('TPMS') with TPMS sensors for sensing wheel speed
Implementation Method 3
a Tire-Pressure Monitoring System ('TPMS') with TPMS sensors for sensing wheel speed in addition to tire pressure
Data Source
AI summary
A vehicle system includes a head vehicle and a tail vehicle that is towed by the head vehicle. Together the head vehicle and tail vehicle have a control subsystem for controlling among other things braking of the tail vehicle. The control subsystem includes a head unit in the head vehicle and a tail unit in the tail vehicle. The head unit further includes a head Inertial Measurement Unit (“IMU”) for measuring orientation and acceleration of the head vehicle, and the tail unit includes a tail IMU for measuring orientation and acceleration of the tail vehicle. With the IMUs, the control subsystem is able to determine relative pitch and orientation of the head vehicle and tail vehicle to control braking and reduce the risk of jackknifing. The tail unit further has wheel speed sensors and a Tire-Pressure Monitoring System (“TPMS”) for sensing wheel speed.