Road Capability Sensing With Triggered Friction Determination
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Solution Overview
Problem
Existing methods for determining road capability, such as those using vehicle dynamics changes, may not provide reliable results when needed, as they do not always initiate the determination procedure at appropriate times, leading to unnecessary executions and less accurate parameter mapping.
Innovation Solution
A method that uses a sensor to generate information packages based on road surface signals, comparing reference and previous content measures to determine if a difference is outside a tolerance range, allowing the execution of a determination procedure only when a significant change is detected, which includes modifying ground engaging member operations to assess road capability parameters like friction or load bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the determination procedure is executed regularly to obtain road capability parameters, then the availability of parameter values is improved, but the reliability of parameter mapping deteriorates due to unnecessary executions when road conditions have not changed
Solution Approach 1:
The system performs a preliminary check by comparing sensor information packages before executing the determination procedure. The control unit compares a current information package with a previous information package from the sensor, and only allows the determination procedure to execute when a significant difference is detected, indicating actual road condition changes. This preliminary filtering action prevents unnecessary procedure executions.
Solution Approach 2:
The system uses feedback from sensor information packages to control the execution of the determination procedure. The control unit continuously receives information packages from the sensor, compares them with previous packages, and uses this feedback to decide whether to permit the determination procedure. This feedback mechanism ensures procedures are only executed when road conditions have actually changed.
2Productivity
If the determination procedure is executed frequently to ensure up-to-date road capability data, then the productivity of road condition assessment is improved, but the reliability of results worsens due to insufficient changes in vehicle dynamics
Solution Approach 1:
The system dynamically adjusts the execution of the determination procedure based on detected changes in road conditions. Rather than using a fixed schedule, the control unit monitors sensor information packages and dynamically permits or prohibits the determination procedure based on whether significant changes are detected. This dynamic approach ensures procedures are executed at appropriate times when conditions warrant assessment.
Solution Approach 2:
Before executing the determination procedure, the system performs a preliminary comparison of sensor information packages to detect significant changes in road conditions. This preliminary action ensures that the determination procedure is only initiated when there is evidence of actual road condition changes, thereby ensuring the reliability of the resulting parameter values.
3Speed
If the determination procedure is allowed to execute based on any sensor information change, then the responsiveness to road condition changes is improved, but the manufacturing precision of parameter values worsens due to inclusion of insignificant variations
Solution Approach 1:
The system applies a threshold-based filtering criterion to distinguish significant road condition changes from insignificant variations. The control unit compares sensor information packages and only permits the determination procedure when the difference exceeds a significant change threshold. This local quality control ensures that only meaningful changes trigger procedure execution, maintaining parameter value precision.
Solution Approach 2:
The system uses parameter comparison of sensor information packages to detect significant changes in road conditions. The control unit evaluates changes in sensor data parameters and only permits the determination procedure when these parameter changes indicate substantial road condition variations. This parameter-based filtering maintains precision by excluding insignificant variations.
Data Source
AI summary
The invention relates to a method for determining a parameter indicative of a road capability of a road segment (16) supporting a vehicle (10). The vehicle (10) comprises a sensor (18) adapted to generate an information package on the basis of signals (20, 22) reflected from the surface of a portion of the road segment (16) in front of the vehicle (10), as seen in an intended direction of travel of the vehicle (10). The vehicle (10) further comprises a plurality of ground engaging members (12, 14). The method comprises: —determining a reference content measure indicative of the information content of an information package supplied by the sensor (18) at a reference time instant (T1); —comparing the reference content measure to a previous content measure indicative of the information content of an information package supplied by the sensor (18) at a previous time instant (T0), the previous time instant (T0) occurring before the reference time instant (T1); —upon detecting that a difference between the reference content measure and the previous content measure is outside a predetermined tolerance range, allowing the execution of a determination procedure for determining the parameter indicative of the road capability of the road segment (16) supporting the vehicle (10); —upon detecting that the difference between the reference content measure and the previous content measure is within the predetermined tolerance range, not allowing the execution of the determination procedure, and —wherein the determination procedure comprises modifying the operation of one or more of the ground engaging members (12, 14).