Vehicle Slip Value Change Rate Road Surface Determination
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Solution Overview
Problem
Existing systems fail to accurately determine road surface conditions and evaluate vehicle characteristics, particularly when driving on surfaces with varying friction coefficients, due to complex calculations required for detecting torque and gripping capability.
Innovation Solution
A control system that measures slip values and calculates their change rates to determine road surface conditions, incorporating a slip value measuring unit, change rate calculator, and road surface condition determiner, while also evaluating vehicle characteristics by correlating driving power requests with slip values and storing these relationships for vehicle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If torque and gripping capability are detected by calculation of numeric values, then accurate determination of wheel spin is achieved, but device complexity and calculation complexity increase significantly
Solution Approach 1:
The patent extracts the essential characteristic of wheel spin by focusing solely on slip value measurement rather than attempting to calculate and integrate multiple parameters (torque, gripping capability, etc.). This extraction principle simplifies the system by taking out only the necessary measurement (slip value) while discarding the complex calculation requirements for other parameters.
Solution Approach 2:
The patent replaces complex mechanical/calculation-based detection systems (requiring torque sensors, gripping capability calculations) with a simpler measurement system based on slip value monitoring. This substitution uses a more straightforward measurement approach that achieves the same detection goal without the complexity of multiple sensors and calculation formulas.
2Device complexity
If slip value is monitored alone, then measurement simplicity is maintained, but road surface condition determination accuracy deteriorates
Solution Approach 1:
The patent applies beforehand cushioning by storing multiple threshold values in advance that correspond to different road surface conditions. Instead of attempting complex real-time analysis of slip values, the system pre-prepares reference thresholds that cushion against the simplicity limitation, allowing accurate road surface determination through simple comparison operations.
Solution Approach 2:
The patent transitions from analyzing the absolute slip value in isolation to analyzing the relationship between slip value and its change rate (second dimension). This dimensional change allows the system to distinguish between different road surface conditions more accurately while maintaining measurement simplicity, as the combination of slip value and its rate of change provides richer information for determination.
3Stability of the object's composition
If driving power is reduced to suppress wheel spin, then wheel spin is controlled, but vehicle productivity and acceleration performance decrease
Solution Approach 1:
The patent applies dynamics by making the driving power control adaptive rather than fixed. The control system dynamically adjusts driving power reduction based on real-time road surface condition determination and slip value monitoring. This allows the system to maintain vehicle stability on low-friction surfaces while preserving acceleration performance on high-friction surfaces, optimizing the balance between stability and productivity according to actual conditions.
Solution Approach 2:
The patent changes the control parameter from a fixed driving power reduction approach to a variable approach based on determined road surface conditions. By adjusting control parameters (degree of power reduction) according to the determined friction coefficient level, the system achieves both stability control when needed and performance preservation when conditions allow.
Data Source
AI summary
A control system in a vehicle configured to rotate a drive wheel by a driving power generated in a driving power source mounted in the vehicle; comprises a slip value measuring unit configured to measure a slip value indicating a degree to which the drive wheel spins; a change rate calculator configured to calculate a change rate of the slip value measured by the slip value measuring unit; and a road surface condition determiner configured to determine a road surface condition according to the change rate of the slip value calculated by the change rate calculator.