EGR Valve Stuck State Detection via Pressure Thresholds
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Solution Overview
Problem
Existing EGR malfunction detection systems face complexity in determining whether an EGR valve is stuck in a closed, open, or intermediate state, as they require intricate procedures to assess the valve's state based on intake pressure measurements.
Innovation Solution
An EGR malfunction detection system that includes a measurement unit to monitor intake pressure and a malfunction detector to determine the valve's state by comparing pressure thresholds when the EGR valve is controlled to be in closed and open states, allowing for easy identification of sticking malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex procedures are used to determine EGR valve sticking state, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection process is segmented into distinct operational phases: normal operation monitoring, forced closing phase, and forced opening phase. Each phase has specific pressure threshold comparisons that simplify the overall complex determination process into manageable segments with clear decision criteria.
Solution Approach 2:
The system changes the operational parameter of the EGR valve from normal controlled operation to forced closing and forced opening states during detection. By actively changing the valve position parameter and monitoring the resulting intake pressure responses against predefined thresholds, the system achieves accurate state determination through parameter variation rather than complex continuous analysis.
2Reliability
If forced driving of EGR valve is performed for detection, then reliability of detection is improved, but loss of time increases
Solution Approach 1:
The detection system employs periodic forced driving cycles of the EGR valve, alternating between forced closing and forced opening phases. This periodic action allows the system to reliably determine valve sticking state through repeated threshold comparisons while limiting the total detection time to a predetermined interval, balancing reliability with time efficiency.
Solution Approach 2:
The system performs preliminary threshold setting and preparation before the actual forced driving detection. By pre-establishing the pressure thresholds and detection criteria, the system reduces the time required during the actual detection phase while maintaining reliable determination of the valve sticking state.
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
The system simplifies the detection of EGR valve malfunctions by employing straightforward pressure threshold comparisons, enabling quick identification of stuck states without complex procedures, facilitating easy diagnosis and notification of anomalies.
Implementation Method 1
a measurement unit configured to measure an intake pressure inside the intake channel
Data Source
AI summary
An EGR malfunction detection system includes an EGR valve configured to open and close an exhaust recirculation path for recirculating an exhaust gas from an exhaust channel to an intake channel of an engine, a measurement unit configured to measure an intake pressure inside the intake channel, a valve controller configured to control the EGR valve, and a malfunction detector configured to detect an anomaly in the exhaust recirculation path in accordance with a measurement unit output and a valve controller output. The malfunction detector determines whether the EGR valve is stuck in accordance with the intake pressures measured when the EGR valve is controlled to open and close. If the EGR valve is stuck, the malfunction detector determines whether the EGR valve is stuck in an open state, stuck in a closed state, or stuck in an intermediate state by comparing the measured pressure with predetermined thresholds.