Vehicle Control Interface Box for CAN Congestion Feedback
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Solution Overview
Problem
In vehicles equipped with autonomous driving systems, CAN communication congestion can lead to inadequate transmission of control requests and signals, resulting in suboptimal autonomous driving performance.
Innovation Solution
A vehicle control interface box is configured with a first reception unit, a calculation unit, and a first transmission unit to receive control requests from the autonomous driving system, calculate an index value representing the degree of CAN communication congestion, and transmit this index value to the autonomous driving system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CAN communication is used for interface between autonomous driving system and vehicle, then communication simplicity is improved, but communication reliability deteriorates when congestion occurs
Solution Approach 1:
The vehicle control interface box calculates an index value representing CAN communication congestion degree and feeds it back to the autonomous driving system. This feedback mechanism enables the autonomous driving system to adjust its transmission plan based on real-time communication status, resolving the contradiction by maintaining simple CAN communication interface while improving transmission reliability through congestion-aware adaptive control.
2Speed
If autonomous driving system continuously transmits control requests, then autonomous driving control responsiveness is improved, but CAN communication congestion worsens
Solution Approach 1:
The autonomous driving system dynamically adjusts its transmission plan based on the received congestion index value. When congestion is detected, the system adapts by prioritizing critical control requests and reducing non-critical transmissions, thereby maintaining responsive control for essential functions while preserving overall communication throughput.
Solution Approach 2:
The system changes transmission parameters such as transmission frequency and priority levels based on the congestion index value. By adjusting these parameters dynamically, the system achieves fast response for critical controls while preventing communication saturation, thus resolving the contradiction between responsiveness and throughput.
3Adaptability or versatility
If autonomous driving system is added to existing vehicle, then autonomous driving functionality is improved, but system integration complexity increases
Solution Approach 1:
The vehicle control interface box serves as an intermediary between the autonomous driving system and the vehicle's existing control systems. It handles the complexity of integration by managing CAN communication, calculating congestion indices, and coordinating control requests, thereby enabling autonomous driving functionality while keeping the overall system integration manageable.
Data Source
AI summary
A VP is configured such that an ADS is installable in the VP. The VP includes a base vehicle and a VCIB. The VCIB acts as an interface between the base vehicle and the ADS by CAN communication. The VCIB includes a reception unit, an index value calculation unit, and a transmission unit. The reception unit receives a control request for the base vehicle from the ADS. The index value calculation unit calculates an index value showing a degree of congestion of the CAN communication. The transmission unit transmits the index value to the ADS.