Air Control Valve Testing via Engine Speed Feedback
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Solution Overview
Problem
Conventional diesel particulate filter (DPF) systems lack an efficient method for testing the proper functioning of components, such as air control valves, and the effectiveness of filter regeneration processes, which is crucial for maintaining filter efficiency and extending its lifespan.
Innovation Solution
A system comprising a filter controller and a vehicular computer that tests the air control valve by varying its closure percentage and monitoring engine speed to determine proper function, and subsequently initiates a regeneration cycle if the valve is functioning correctly, using a method that includes closing the valve to a partially closed condition and sensing engine speed reactions to assess functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DPF systems operate without integrated testing, then the system structure remains simple, but the ability to detect component failures and regeneration effectiveness is insufficient
Solution Approach 1:
The patent combines the testing system with the existing DPF control system by integrating a vehicular computer that communicates with the filter controller through existing data buses. The testing functionality is merged into the control unit rather than being a separate standalone system, allowing failure detection capabilities to be added without significantly increasing overall system complexity.
Solution Approach 2:
The vehicular computer serves multiple functions: it controls the air control valve during testing, monitors engine conditions, determines test results, and communicates with the filter controller. This multi-functional approach allows one component to perform multiple roles in the testing system, reducing the need for additional dedicated components.
2Measurement precision
If the air control valve is tested by monitoring engine speed response, then component functionality can be accurately assessed, but the testing process requires precise measurement capabilities
Solution Approach 1:
The testing method uses feedback by monitoring the engine speed response after the air control valve is commanded to close. The vehicular computer compares the actual engine speed change against expected values to determine valve functionality. This feedback mechanism enables accurate assessment of valve performance through precise engine speed measurements that are already available from the vehicle's existing sensor system.
3Reliability
If comprehensive testing including regeneration cycle verification is implemented, then system reliability improves, but the testing time and complexity increase
Solution Approach 1:
The system performs preliminary testing of the air control valve before initiating a full regeneration cycle test. By first verifying valve functionality through quick engine speed response testing, the system can determine whether to proceed with more time-consuming regeneration verification. This staged approach allows comprehensive reliability testing while minimizing unnecessary testing time by skipping full regeneration cycles when components are already known to be faulty.
Data Source
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AI summary
A system for testing the air control valve (ACV) of a particulate filter system includes a filter controller connected to the particulate filter system, a vehicular computer configured to determine at least one engine condition (engine rotational speed, RPM). The filter controller is configured to control a condition of the ACV and the vehicule computer is operatively connected to the filter controller to communicate therewith. The vehicular computer compares the condition of the ACV with the engine condition (RPM) to determine whether the component of the particulate filter system is functioning properly.