Rollover Prediction Using ABS Sensor Speed Differences
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Solution Overview
Problem
Existing rollover prevention systems for heavy-duty trucks require additional sensors to measure tire forces and vehicle center of gravity, increasing cost and complexity, and are not universally applicable due to the need for specific variables like rolling radius and steering angle measurements.
Innovation Solution
A method that uses existing ABS sensors to measure tire rotational speeds and lateral acceleration to calculate load transfer ratio (LTR) without determining the vehicle's center of gravity, utilizing the difference in rotational speeds between inside and outside tires during turns to detect incipient rollover conditions, thereby eliminating the need for additional sensors and complex calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If load sensors are installed at each tire to measure forces, then rollover detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses existing ABS sensors that are already installed on the vehicle to measure tire rotational speeds. The system makes these sensors serve a dual purpose: both anti-lock braking and rollover detection, eliminating the need for separate load sensors at each tire.
Solution Approach 2:
The patent replaces direct mechanical load measurement with an indirect measurement approach using rotational speed differences. By calculating LTR from rotational speed data rather than direct force sensors, the system achieves rollover detection without additional mechanical sensing equipment.
2Measurement precision
If additional sensors are installed to measure rolling radius and steering angle, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system uses existing ABS sensors that are already part of the vehicle's standard equipment. These sensors continuously measure rotational speeds as part of the anti-lock braking system, making them available for rollover detection without requiring additional sensor installations.
Solution Approach 2:
The existing rotational speed sensors serve multiple functions: anti-lock braking control and rollover detection. This multi-functionality allows the system to achieve accurate measurements without adding dedicated sensors for each measurement parameter.
3Measurement precision
If center of gravity determination is included in the calculation, then rollover prediction accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent extracts and eliminates the center of gravity determination step from the LTR calculation process. By formulating LTR to depend only on rotational speed differences and vehicle parameters, the system achieves accurate rollover prediction without the complex CG calculations.
Solution Approach 2:
The patent changes the calculation parameters from requiring center of gravity position to using only rotational speed differences and known vehicle geometric parameters. This parameter substitution simplifies the calculation while maintaining prediction accuracy.
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 effectively predicts rollover conditions using existing vehicle equipment, reducing costs and complexity while providing timely warnings to operators, as it accurately determines load transfer ratios and roll stability without requiring additional sensor installations.
Implementation Method 1
As a roll moment acts on a vehicle, the load shifts from one side of the vehicle to the other side until the tires on one side carry all of the load, indicating an incipient rollover condition.
Implementation Method 2
As a vehicle travels through a turn, the outside tires travel a greater distance than the inside tires in a given amount of time. Therefore, the outside tires have a greater rotational speed than the inside tires.
Data Source
AI summary
A system for determining a rollover property of a vehicle includes sensors capable of sensing lateral acceleration, a first left tire rotational speed, a first right tire rotational speed, and a mass property. The sensors output a lateral acceleration signal, a first left tire rotational speed signal, a first right tire rotational speed signal, and a mass property signal. A processing unit receives the signals and uses the received signals to determine a rollover property of the vehicle.