Accelerometer-Based Tire Skid Detection
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Solution Overview
Problem
Conventional anti-lock braking systems (ABS) are cumbersome, costly, and require complex components like wheel speed sensors, which can be prohibitive in certain situations, and do not effectively address tire skidding without increasing vehicle weight and complexity.
Innovation Solution
Utilizing an accelerometer to detect tire skid by processing acceleration signals to determine if the vehicle is experiencing skidding, allowing for controlled brake pressure adjustments without the need for elaborate wheel speed sensors, and leveraging existing hardware like three-axis accelerometers and controllers for autopilot systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-lock braking systems with wheel speed sensors are used to detect tire skid, then skid detection capability is improved, but vehicle weight, cost, and system complexity increase
Solution Approach 1:
The patent extracts the skid detection function from the complex wheel speed sensor system and implements it using only the accelerometer already present in the vehicle for other purposes (e.g., airbag deployment). By taking out the detection function and implementing it through signal processing of existing sensor data, the system achieves skid detection without adding wheel speed sensors, harnessing, or dedicated controllers
Solution Approach 2:
The patent makes the existing accelerometer multi-functional by using it both for its original purpose (vehicle safety systems like airbags) and for skid detection. The accelerometer's output signal is processed to detect skid conditions, allowing one component to serve multiple functions and eliminating the need for dedicated skid detection hardware
2Measurement precision
If wheel speed sensors and associated components are installed to detect tire skid, then skid detection accuracy is improved, but vehicle cost and installation complexity increase
Solution Approach 1:
The system uses the vehicle's existing accelerometer and its output signal to perform skid detection, making the system self-sufficient without requiring additional sensors or external components. The accelerometer already generates the data needed, and the controller processes this existing data to detect skid conditions, eliminating installation complexity
3Reliability
If traditional anti-lock braking system components are added to prevent skidding, then vehicle control during braking is improved, but vehicle weight increases
Solution Approach 1:
The patent extracts the braking control function from the heavy traditional ABS system and implements it using only the existing accelerometer and controller. By taking out the control function and implementing it through processing of existing sensor data, the system achieves braking control without adding wheel speed sensors, harnessing, or dedicated ABS controllers that would increase vehicle weight
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 approach allows for robust and reliable tire skid detection, reducing tire wear and enabling well-controlled stops without the added weight, space, or cost of traditional ABS systems, and can function as a backup in case of ABS failure.
Implementation Method 1
the accelerometer provides a signal to indicate the vehicle's acceleration or deceleration
Implementation Method 2
a vehicle's braking system converts the kinetic energy of the moving vehicle to heat. This friction is generated when a brake pad or shoe is forced into contact with a brake disc or drum
Data Source
AI summary
A technique involves operating a vehicle. The technique includes receiving, by processing circuitry, an accelerometer signal from an accelerometer. The technique further includes processing, by the processing circuitry, the accelerometer signal to determine whether the vehicle is currently experiencing tire skid. The technique further includes controlling, by the processing circuitry, the vehicle based on whether the vehicle is currently experiencing tire skid.