Air Starter Hydrostatic Lock Detection via Speed and Pressure Monitoring

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Solution Overview

Problem

Hydrostatic lock conditions in combustion engines, caused by incompressible liquids in the cylinder, can lead to engine damage during startup, as existing air turbine starters lack effective detection methods to prevent mechanical failure.

Innovation Solution

A method and assembly that monitor rotational speed and inlet air pressure parameters of the turbine air starter to determine hydrostatic lock conditions, using a hydrostatic lock detection module to provide an indication or cease the start sequence, thereby preventing engine damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If air turbine starter is used to initiate engine rotation, then engine starting capability is improved, but risk of mechanical damage from hydrostatic lock increases

Engineering Contradiction:

Improveengine starting capabilityVSAvoidrisk of mechanical damage

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary detection of hydrostatic lock conditions before initiating the engine start sequence. By monitoring compression chamber pressure and comparing it to a threshold value, the system identifies potential hydrostatic lock conditions in advance and prevents starter engagement, thereby avoiding mechanical damage while maintaining starting capability when conditions are safe

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system continuously monitors compression chamber pressure during the start sequence and provides real-time feedback to the control module. When pressure exceeds the threshold indicating hydrostatic lock, the feedback triggers immediate cessation of the start sequence, creating a closed-loop safety mechanism that prevents damage while allowing normal starting operation

Inventive Principle:

Principle #23Feedback

2Reliability

If hydrostatic lock detection is implemented, then engine protection is improved, but device complexity increases

Engineering Contradiction:

Improveengine protectionVSAvoiddetection system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses compression chamber pressure as an intermediary parameter to detect hydrostatic lock conditions. Rather than directly detecting liquid presence or mechanical lock, the pressure sensor provides an indirect but reliable indicator that triggers the protection mechanism, simplifying the detection system while maintaining effectiveness

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system replaces complex mechanical detection mechanisms with electronic pressure sensing and control. Instead of using mechanical sensors or switches to detect hydrostatic lock, the invention uses electronic pressure transducers and microcontroller-based logic, reducing mechanical complexity while improving reliability and response speed

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentEP3320203B1Air starter and methods for determining hydrostatic lock

Publication Date: 2019.12.18 GE AVIATION SYSTEMS LLC

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AI summary

Air starter and methods for determining hydrostatic lock in a combustion engine during a start sequence with an air starter, including during the start sequence of the combustion engine, monitoring a speed parameter indicative of a rotational speed of the turbine air starter and a pressure parameter indicative of an inlet air pressure of the turbine air starter, and determining that a hydrostatic lock condition exists in the combustion engine based on both the speed threshold and the pressure threshold.