Preview Damping Control Using Shared Road Surface Database
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Solution Overview
Problem
Current preview damping control systems require a large number of vehicles to travel on the same road at various lateral positions to effectively acquire and store road surface information, limiting their ability to reduce vehicle vibration efficiently.
Innovation Solution
A preview damping control apparatus and method that uses in-vehicle road surface displacement-related information detection devices and a preview reference database to associate and store road surface displacement-related values and position information, allowing for effective damping control without the need for multiple vehicles to travel on the same road by assuming in-phase components of road surface displacement-related values at adjacent points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If road surface information is acquired using laser sensors or motion state quantity detection sensors, then measurement precision of road surface information is improved, but the lateral range of information acquisition is reduced
Solution Approach 1:
The patent combines road surface information from multiple vehicles traveling on the same road into a single database. By merging data from multiple sources (vehicles), the system achieves wide lateral coverage without requiring a single sensor to scan the entire width, thus resolving the contradiction between measurement precision and lateral range.
Solution Approach 2:
The database serves multiple functions: it stores road surface information for database-building vehicles, provides preview information for damping control, and enables multiple vehicles to benefit from shared data. This multi-functionality allows the system to achieve wide coverage through data aggregation rather than physical sensor expansion.
2Area of stationary object
If a large number of vehicles travel on the same road at various lateral positions to acquire road surface information, then the lateral range of database coverage is improved, but device complexity and data acquisition requirements increase
Solution Approach 1:
Instead of requiring physical sensors to physically scan the entire road width, the system creates information copies by collecting data from multiple vehicles and storing them in a database. Each vehicle's sensor data is a copy of the road surface state, and the database aggregates these copies to achieve comprehensive coverage without complex acquisition systems.
3Reliability
If road surface information is acquired over a wide lateral range, then the effectiveness of preview damping control is improved, but the quantity of data that must be acquired increases
Solution Approach 1:
The system performs preliminary data aggregation by collecting and storing road surface information from multiple vehicles in advance in a database. This preliminary action ensures that when any vehicle needs damping control information, comprehensive data is already available without requiring real-time data collection from multiple sources, thus reducing the quantity of data that must be acquired at any given moment.
Data Source
AI summary
A damping force control apparatus for a vehicle in which road surface displacement-related information corresponding to left and right wheels detected by a pair of in-vehicle detection devices is transmitted to a preview reference database control device together with the detection position information, a preview reference database including road surface displacement-related values is created, preview damping control that reduces vibration of a sprung of the vehicle is performed using the road surface displacement-related values in the preview reference database, and it is assumed that road surface displacement-related values in predetermined adjacent regions located in a direction crossing a traveling direction of the vehicle with respect to two points where the road surface displacement-related information was detected by the pair of in-vehicle detection devices are the same as an in-phase component of the road surface displacement-related values at the two points.