4WD ECU Firewall for VSA Torque Command Integration

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Solution Overview

Problem

The synergistic operation of vehicle stability assist (VSA) and four-wheel-drive (4WD) systems is inefficient due to contradictory requests and lack of scrutiny, leading to potential unsafe conditions when torque reduction or limitation commands are implemented.

Innovation Solution

A method that deploys torque commands from the VSA system to the 4WD system using a firewall within the 4WD ECU to analyze and integrate requests, preventing unsafe conditions by scaling and limiting torque adjustments based on vehicle dynamics and speed coefficients, ensuring stable operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the VSA system sends torque reduction or limitation commands to the 4WD system, then vehicle stability control is improved, but contradictory requests from the 4WD system may lead to unsafe conditions

Engineering Contradiction:

Improvevehicle stability controlVSAvoidunsafe conditions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a firewall as an intermediary component within the 4WD ECU that mediates between VSA torque commands and 4WD torque commands. The firewall analyzes VSA requests, compares them with 4WD system state, and determines safe integration or rejection of torque reduction/limitation commands, preventing contradictory requests from causing unsafe conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The firewall implements feedback by continuously monitoring the 4WD system state (torque commands, wheel speeds, slip conditions) and using this information to evaluate VSA torque requests. The firewall adjusts its decision-making based on real-time system feedback, allowing torque reduction when safe and preventing it when contradictory requests would create unsafe conditions.

Inventive Principle:

Principle #23Feedback

2Speed

If the 4WD system implements all VSA torque commands without scrutiny, then response time is improved, but erroneous requests can cause unsafe operation

Engineering Contradiction:

Improveresponse timeVSAvoidsafe operation

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The firewall performs preliminary analysis of VSA torque commands before they are implemented by the 4WD system. By evaluating the safety and appropriateness of each VSA request in advance (comparing with current 4WD system state), the firewall prevents erroneous commands from causing unsafe operation while maintaining rapid response to valid commands.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If the VSA and 4WD systems operate independently without integration, then system complexity is reduced, but synergistic operation and performance envelope are limited

Engineering Contradiction:

Improvesystem integrationVSAvoidperformance envelope

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent merges VSA torque commands with 4WD torque commands through the firewall integration logic. The firewall combines information from both control systems, evaluates their compatibility, and generates integrated wheel torque commands that achieve synergistic operation, expanding the performance envelope without requiring full system rearchitecture.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7634342B2Method for deploying a torque reduction and torque limitation command through per wheel torque control of a controllable 4-wheel-drive system

Publication Date: 2009.12.15 HONDA MOTOR CO LTD

AI summary

A method for deploying torque commands from a vehicle stability assist control system to a four wheel drive system in a vehicle that includes utilizing a firewall within a four wheel drive system electronic control unit to analyze commands sent from a vehicle stability assist electronic control unit to the four wheel drive electronic control unit. Additionally, the commands from the vehicle stability assist electronic control unit, when the vehicle control system is in operation, are integrated with commands independently generated by the four wheel drive electronic control unit, and resultant wheel torque commands are generated to be provided to each individual wheel in the four wheel drive system.