Vehicle Signal Control System Modular Networked Architecture
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Solution Overview
Problem
The installation and coordination of electronic visual and audible signaling systems on vehicles are resource-intensive, requiring extensive labor and materials due to the need for hand-wiring and programming of each signaling module, which complicates the integration of integrated wiring harnesses and control systems.
Innovation Solution
A modular networked control system that uses a central controller connected to remote controllers via a network, allowing for the generation, encoding, and transmission of desired states for functional warning units, enabling efficient control and coordination of visual and audible signaling devices with reduced cabling and simplified installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hand-wiring and programming of each signaling module is used, then control precision and reliability are improved, but device complexity and installation time increase
Solution Approach 1:
The system is divided into a central controller and multiple remote controllers, each responsible for specific signaling modules. The central controller manages high-priority functions (emergency lights, sirens) while remote controllers handle peripheral functions (perimeter lights, headlight flashers), distributing complexity across modular units.
Solution Approach 2:
A dedicated control bus serves as an intermediary communication channel between the central controller and remote controllers, replacing complex point-to-point wiring with a standardized communication protocol that simplifies connections while maintaining reliable control.
2Productivity
If integrated wiring harnesses are used, then installation efficiency is improved, but harness weight and material cost increase
Solution Approach 1:
The wiring harness is segmented into modular components: a central power distribution unit and separate remote controller units. Each remote controller has its own localized wiring to signaling modules, eliminating the need for a single heavy integrated harness spanning the entire vehicle.
Solution Approach 2:
The system transitions from a two-dimensional planar wiring layout to a three-dimensional star topology with the central controller as the hub. This allows shorter cable runs from each remote controller to its associated signaling modules, reducing total harness length and weight.
3Adaptability or versatility
If multiple remote controllers are connected via network, then system scalability is improved, but communication complexity increases
Solution Approach 1:
The control bus implements a universal communication protocol that handles multiple functions: command transmission from central to remote controllers, status reporting from remote to central, and coordinated control of different signaling module types. This single multi-functional protocol reduces communication complexity compared to dedicated protocols for each function.
4Weight of stationary object
If short cable lengths are used, then harness cost and weight are reduced, but signal transmission reliability may worsen
Solution Approach 1:
The control bus acts as an intermediary communication medium with built-in signal conditioning, shielding, and error correction capabilities. This dedicated communication infrastructure maintains signal integrity over the shortened cable lengths by compensating for reduced signal margin through improved transmission quality rather than relying on cable length alone.
Data Source
AI summary
A vehicle control system includes, among other things, one or more functional warning units positioned in various positions in a vehicle. A central controller is configured to generate a desired state of the functional warning units and encode the desired state into a packet. Each of multiple remote controllers is functionally connected to at least one of the functional warning units. A functional connection between the central controller and the multiple remote controllers is configured to transmit the encoded packet from the central controller to each of the remote controllers. The remote controllers are configured to parse the desired state of each of the functional warning units in the encoded packet and set the state of each of the functional warning units based on the parsed encoded packet.