Fuel Injection Valve Switching Point Control

Solution Overview

Problem

Existing methods for determining the switching point in time for solenoid valves in fuel injection systems face challenges in achieving precise control, as weak switching points can lead to oscillations and instability, while strong points require high control amplification to adjust rapidly, necessitating a compromise in controller design.

Innovation Solution

An additional evaluation of the measured signal curve is performed to calculate a criterion for the quality of the switching point, allowing for differentiated control amplification based on the criterion, where high-quality switching points are adjusted with greater amplification and low-quality points are weighted less, preventing oscillations and ensuring rapid adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If high control amplification is used to achieve rapid adjustment, then adjustment speed is improved, but controller oscillations and instability occur due to weak switching points

Engineering Contradiction:

Improveadjustment speedVSAvoidcontroller stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The control amplification is made dynamic by adapting it to the quality of each switching point. The controller automatically adjusts the amplification factor based on the detected switching point quality, using high amplification for clear switching points and low amplification for weak switching points, thereby achieving both rapid adjustment and stability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control parameter (amplification factor) is changed based on the quality assessment of the switching point. By evaluating the signal characteristics and adjusting the amplification parameter accordingly, the system optimizes both response speed and stability for different operating conditions

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If low control amplification is used to prevent oscillations, then controller stability is improved, but adjustment speed decreases

Engineering Contradiction:

Improvecontroller stabilityVSAvoidadjustment speed

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The control amplification is made dynamic by adapting it to the quality of each switching point. The controller automatically adjusts the amplification factor based on the detected switching point quality, using high amplification for clear switching points and low amplification for weak switching points, thereby achieving both rapid adjustment and stability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control parameter (amplification factor) is changed based on the quality assessment of the switching point. By evaluating the signal characteristics and adjusting the amplification parameter accordingly, the system optimizes both response speed and stability for different operating conditions

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If a fixed control amplification is used, then controller design is simplified, but performance is compromised for both weak and strong switching points

Engineering Contradiction:

Improvecontroller design complexityVSAvoidcontrol performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The control amplification is made dynamic by adapting it to the quality of each switching point. The controller automatically adjusts the amplification factor based on the detected switching point quality, using high amplification for clear switching points and low amplification for weak switching points, thereby achieving both rapid adjustment and stability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control parameter (amplification factor) is changed based on the quality assessment of the switching point. By evaluating the signal characteristics and adjusting the amplification parameter accordingly, the system optimizes both response speed and stability for different operating conditions

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 significantly improves control behavior by reducing interference from weak switching points and enabling rapid adjustment with high control amplification during clear switching points, preventing controller oscillations and achieving stable operation.

Implementation Method 1

The basis for the calculation of the switching point in time is an electrical signal measured after the activation of the valve

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Data Source

PatentUS10302037B2Method for controlling metering of fuel

Publication Date: 2019.05.28 ROBERT BOSCH GMBH

AI summary

A method is described for controlling the metering of fuel. A feature, which characterizes the switching point in time of a valve, is ascertained based on a measured signal curve. The feature is fed as an actual variable to a controller. A criterion of the feature is ascertained, the controller taking the criterion of the feature into account.