Venturi Pump Diagnosis With ELCM And Fuel Tank Feedback
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Solution Overview
Problem
Diagnosing components of an evaporative emission control system is challenging due to pressure changes, engine operation dependency, and ambient temperature variations, making it difficult to meet regulatory diagnostic requirements.
Innovation Solution
A method for diagnosing a venturi pump in the evaporative emissions system using feedback from an evaporative leak check module (ELCM) pressure sensor and a fuel tank pressure transducer (FTPT), leveraging existing hardware for minimal additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional diagnostic methods are used for evaporative emission control system, then diagnostic capability is provided, but system complexity and hardware additions increase significantly
Solution Approach 1:
The patent applies multi-functionality by utilizing the existing ELCM pressure sensor and FTPT for dual purposes: both monitor system pressure conditions and provide diagnostic feedback for the venturi pump. This eliminates the need for separate diagnostic hardware while maintaining comprehensive diagnostic capability.
Solution Approach 2:
The system performs self-diagnosis by using its own existing sensors and operational data to evaluate the venturi pump status. The controller analyzes pressure feedback from the ELCM and fuel tank to determine pump performance without requiring external diagnostic equipment.
2Measurement precision
If pressure sensors and transducers are added to improve diagnostic accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The existing ELCM pressure sensor and fuel tank pressure transducer are made multi-functional by using them for both pressure monitoring and diagnostic measurements. This approach maintains measurement precision for diagnostic purposes without adding new sensors.
Solution Approach 2:
The system uses feedback from the existing pressure sensors to diagnose venturi pump performance. The controller continuously monitors pressure data from the ELCM and fuel tank to detect pump degradation, eliminating the need for additional diagnostic sensors.
3Reliability
If diagnostic routines are implemented to meet regulatory requirements, then compliance is achieved, but system complexity and development effort increase
Solution Approach 1:
The system performs self-diagnosis using its existing hardware and operational data. The controller executes diagnostic routines that analyze pressure feedback from the ELCM and fuel tank to evaluate venturi pump status, meeting regulatory requirements without complex external testing equipment.
Solution Approach 2:
The diagnostic routine uses feedback from existing pressure sensors to determine venturi pump performance. By continuously monitoring pressure data and comparing it against expected parameters, the system achieves regulatory compliance through simple, implementable diagnostic logic.
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
Enables effective diagnosis of the venturi pump, ensuring compliance with regulatory diagnostics without significant hardware additions.
Implementation Method 1
A method for diagnosing a venturi pump in an evaporative emissions system
Implementation Method 2
feedback from an evaporative leak check module (ELCM) pressure sensor
Implementation Method 3
fuel tank pressure transducer (FTPT)
Data Source
AI summary
Methods and systems for diagnosing an evaporative emissions system are discussed. An example method includes diagnosing a venturi pump of an evaporative emissions system based on feedback from an evaporative leak check module (ELCM) pressure sensor and a fuel tank pressure transducer (FTPT). An engine of a vehicle is off during the diagnosing.