Dual Data Bus Architecture for Hybrid Vehicle Control Communication
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Solution Overview
Problem
In vehicles with hybrid drives, the increasing bus load on the CAN bus due to additional control devices for electric motors and other components leads to communication overload and potential disruptions, making it difficult to maintain data communication and diagnosis.
Innovation Solution
Implementing a dual data bus system where the first data bus handles communication between the first control devices and the second data bus handles communication between second control devices, allowing for independent data transmission and diagnosis without overloading the existing system, and using switching means to isolate faulty data bus sections in case of faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional control devices for hybrid drive components are added to the existing CAN bus, then the functionality and control capability of the hybrid vehicle is improved, but the bus load on the CAN bus increases leading to communication overload and potential disruptions
Solution Approach 1:
The patent divides the vehicle control system into two separate data bus systems: a first data bus for conventional vehicle control devices and a second data bus for hybrid drive control devices. This segmentation isolates the high data volume hybrid communication traffic from the conventional CAN bus, preventing communication overload while maintaining both control capabilities and communication reliability.
2Ease of operation
If a single data bus is used for all control devices, then the system complexity is reduced and ease of operation is improved, but the bus becomes overloaded when multiple hybrid control devices transmit data simultaneously
Solution Approach 1:
The patent implements segmentation by creating separate first and second data buses for different control device groups. This allows high-priority hybrid drive data transmission to occur on the second bus without being bottlenecked by conventional vehicle data traffic on the first bus, thereby improving overall data transmission efficiency while maintaining manageable system complexity through structured organization.
Solution Approach 2:
The patent introduces a gateway control device that acts as an intermediary between the first and second data buses. This gateway manages data routing and communication protocols between the two separate bus systems, enabling efficient data transmission across the segmented architecture while presenting a unified interface to higher-level control systems.
3Ease of manufacture
If the existing CAN bus is used for all communication, then the ease of manufacture is improved by reusing existing infrastructure, but the bus load becomes too high for reliable communication in hybrid vehicles
Solution Approach 1:
The patent segments the communication infrastructure into two separate data bus systems, allowing the first bus to reuse the existing CAN bus infrastructure for conventional control devices while adding a second bus specifically for hybrid drive components. This approach maintains ease of manufacture by leveraging existing systems while ensuring reliable communication through dedicated high-capacity pathways for hybrid data traffic.
4Device complexity
If data transmission between all control devices occurs on a single bus, then the device complexity is reduced, but the bus load increases causing communication disruptions
Solution Approach 1:
The patent applies segmentation by organizing control devices into two distinct groups connected to separate data buses: conventional devices on the first bus and hybrid drive devices on the second bus. This segmentation reduces the communication load on each individual bus, preventing overloads and disruptions while maintaining relatively simple bus architectures through standardized protocols and gateway-mediated communication.
Data Source
AI summary
The invention relates to a method for transmitting data between control devices in a vehicle, comprising at least one first control device (101-125) and several second control devices (6-9). In said method, data that is to be transmitted between a first control device (101-125) and a second control device (6-9) is transmitted via a first data bus (2a-2f) and data that is to be transmitted between two control devices (6-9) of the second control devices (6-9) is transmitted via a second data bus (10).