DOIP Adapter Circuit Without VCI Signal Translation

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Solution Overview

Problem

Existing vehicle diagnostic systems require a vehicle communication interface (VCI) processor for DOIP signal translation, increasing complexity and cost.

Innovation Solution

A diagnostic over internet protocol (DOIP) adapter that eliminates the need for a VCI by using a comparator circuit and multiplexing circuit to interface directly between the vehicle's diagnostic bus and a diagnostic processor, utilizing connectors like J1962 and RJ45, and optionally wireless communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a VCI processor is used for DOIP signal translation, then communication compatibility is improved, but device complexity and cost increase

Engineering Contradiction:

Improvecommunication compatibilityVSAvoidsystem complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent extracts the VCI processor from the system by implementing direct DOIP communication between the scan tool and vehicle through adaptive pin configuration detection and switching, eliminating the need for a separate translation processor while maintaining communication compatibility

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The connector implements multi-functionality by detecting different pin configurations (high-side dominant, low-side dominant, balanced) and automatically switching between them, allowing a single connector to handle multiple communication modes without requiring separate dedicated hardware for each mode

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a VCI processor is used for DOIP signal translation, then communication compatibility is improved, but manufacturing cost increases

Engineering Contradiction:

Improvecommunication compatibilityVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent removes the expensive VCI processor component from the system architecture, replacing it with cost-effective pin configuration detection and switching circuitry that achieves the same communication compatibility at lower manufacturing cost

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses simpler, less expensive components (comparators, multiplexers, connectors) instead of a costly processor to achieve DOIP communication, accepting that these simpler components perform a more limited function but are sufficient for the application

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Adaptability or versatility

If pin configuration detection and switching is implemented, then adaptability to different DOIP configurations is improved, but device complexity increases

Engineering Contradiction:

Improvepin configuration adaptabilityVSAvoidcircuit complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent introduces intermediary components (comparator circuits and multiplexer switches) that mediate between the connector and communication interface, automatically detecting pin configurations and switching connections without requiring complex processor-based control logic

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12555420B2Adapter and circuit for diagnostic over internet protocol communication

Publication Date: 2026.02.17 BOSCH AUTOMOTIVE SERVICE SOLUTIONS INC

AI summary

An adapter to be used for diagnostics over internet protocol (DOIP) compatible vehicle diagnostic systems, providing interconnectivity between the diagnostic bus of a vehicle and a diagnostic processor. The adapter transfers a DOIP signal from a first connector to another format. Some embodiments transfer the DOIP signal to a second connector for hardwired communication, such as an Ethernet-compatible connector. Some embodiments transfer the DOIP signal to a wireless signal, such as a Wi-Fi compatible signal, for wireless communication with the diagnostic processor.