Transient Fuel Control Compensation via Chamber Temperature

Solution Overview

Problem

Conventional engine control systems apply steady state cylinder parameter settings during transient modes, leading to non-optimized engine outputs, increased emissions, and reduced fuel economy due to RPM lag in indicating engine mode changes.

Innovation Solution

Adjusting cylinder parameter settings based on real-time chamber temperature in response to fuel injection acceleration greater than a positive threshold, allowing for independent adjustments of cam timing, spark timing, and fuel injection timing to optimize engine performance during transient modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If steady state cylinder parameter settings are applied during transient mode, then device complexity is reduced and ease of operation is maintained, but engine output is non-optimized, emissions increase, and fuel economy deteriorates

Engineering Contradiction:

Improveease of operationVSAvoidengine output

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The system dynamically adjusts cylinder parameter settings based on detected transient conditions. When transient mode is detected through monitoring engine speed rate and fuel injection acceleration, the controller automatically modifies spark timing, cam timing, and fuel injection timing parameters to optimize engine output during transient operation, rather than relying on fixed steady state settings

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters (spark timing, cam timing, fuel injection timing) in response to detected transient conditions. By monitoring changes in engine speed rate and fuel injection acceleration, the controller adjusts these parameters to achieve optimized engine output during transient mode while maintaining simplicity through automated detection and adjustment

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If steady state cylinder parameter settings are applied during transient mode, then manufacturing precision and measurement requirements are reduced, but emissions increase and fuel economy decreases

Engineering Contradiction:

Improvemanufacturing precisionVSAvoidemissions

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The system dynamically adjusts cylinder parameter settings based on detected transient conditions. When transient mode is detected through monitoring engine speed rate and fuel injection acceleration, the controller automatically modifies spark timing, cam timing, and fuel injection timing parameters to optimize engine output during transient operation, rather than relying on fixed steady state settings

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes operational parameters (spark timing, cam timing, fuel injection timing) in response to detected transient conditions. By monitoring changes in engine speed rate and fuel injection acceleration, the controller adjusts these parameters to achieve optimized engine output during transient mode while maintaining simplicity through automated detection and adjustment

Inventive Principle:

Principle #35Parameter changes

3Difficulty of detecting and measuring

If RPM rate is used to indicate transient mode, then measurement simplicity is maintained, but response time is delayed due to RPM lag

Engineering Contradiction:

Improvedifficulty of detecting and measuringVSAvoidresponse time

Core Design Contradiction:

Difficulty of detecting and measuringVSLoss of time

Solution Approach 1:

The system performs preliminary detection of transient mode by monitoring fuel injection acceleration before RPM rate fully reflects the transient condition. By detecting changes in fuel injection acceleration as an early indicator, the system triggers parameter adjustments in advance, compensating for the inherent delay in RPM-based detection and improving overall response time

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses fuel injection acceleration as an intermediary indicator to detect transient mode earlier than RPM rate alone would allow. This intermediary measurement provides advance warning of transient conditions, enabling the controller to prepare and apply optimized parameters before the full transient effect occurs, thereby reducing the effective response delay

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11739708B2Methods for transient fuel control compensation

Publication Date: 2023.08.29 FORD GLOBAL TECH LLC

AI summary

Methods and systems are provided for an engine for adjusting cylinder parameter settings to optimize engine output during a transient mode. In one example, a method may include adjusting cylinder parameter settings, including a cam timing setting, a spark timing setting, and a fuel injection timing setting based on a chamber temperature in response to a rate of fuel injection acceleration being greater than a positive threshold, thus indicating the engine is in the transient mode.