Fuel Injection Control Device Partial Lift Learning

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Solution Overview

Problem

Existing fuel injection systems face challenges in accurately learning and controlling the injection characteristic during partial lift injection, leading to variations in injection quantity and potential emissions and drivability issues due to individual differences in fuel injectors.

Innovation Solution

A fuel injection control device that divides the requested injection quantity into a specified injection quantity and an adjusting injection quantity, allowing for both adjusting and partial lift injections to be performed by the fuel injector, enabling the learning of injection characteristics during partial lift conditions and improving control accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If partial lift injection is used to reduce minimum injection quantity, then injection quantity control precision is improved, but the opportunity to learn injection characteristic is reduced

Engineering Contradiction:

Improveinjection quantity control precisionVSAvoidopportunity to learn injection characteristic

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The system performs partial lift injection in advance of normal operation to learn the injection characteristic. By dividing the requested injection quantity into specified and adjusting portions, the system creates opportunities to execute partial lift injection before full lift injection, allowing the learning part to acquire injection characteristic data proactively rather than waiting for natural partial lift conditions to occur.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If request injection quantity is always satisfied by adjusting injection, then injection quantity accuracy is improved, but partial lift injection learning opportunities are lost

Engineering Contradiction:

Improveinjection quantity accuracyVSAvoidinjection characteristic data

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The system intentionally uses partial lift injection even when the requested injection quantity could be satisfied by adjusting injection alone. By dividing the injection quantity into specified (delivered by partial lift) and adjusting portions, the system deliberately performs partial lift action beyond what is strictly necessary for quantity accuracy, thereby creating learning opportunities without compromising overall injection precision.

Inventive Principle:

Principle #16Partial or excessive action

3Productivity

If partial lift injection is performed frequently, then learning opportunity is improved, but fuel atomization quality may deteriorate

Engineering Contradiction:

Improvelearning opportunity frequencyVSAvoidfuel atomization quality

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The system changes the injection quantity parameters by dividing the requested quantity into specified and adjusting portions. This parameter division allows flexible control of partial lift injection frequency and duration, enabling the system to perform partial lift injection for learning purposes while adjusting the specified injection quantity to ensure adequate fuel delivery for proper atomization and combustion.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for accurate learning and control of injection characteristics during partial lift injections, enhancing the opportunity to learn and correct injection patterns, thereby improving fuel atomization and reducing emissions and drivability issues.

Implementation Method 1

a solenoid 31 to which an injection pulse is applied and which generates an electromagnetic force

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Data Source

PatentUS10215124B2Fuel injection control device

Publication Date: 2019.02.26 DENSO CORP

AI summary

A fuel injection control device is a control device controlling an injection of fuel by a fuel injector and includes: a setting part that sets a request injection quantity of an injection quantity requested of the fuel injector; a dividing part that divides the request injection quantity set by the setting part into a specified injection quantity and an adjusting injection quantity other than the specified injection quantity; an injection performing part that performs a dividing injection of an adjusting injection and a partial lift injection by the fuel injector, the adjusting injection injecting the adjusting injection quantity of fuel, the partial lift injection finishing a lift of a valve body of the fuel injector in a partial lift state before the valve body reaching a full lift position and injecting the specified injection quantity of fuel; and a learning part that learns an injection characteristic of the fuel injector at the time of the partial lift injection.