Exhaust PM Trap Removal Checks Gated by Engine Output Stability
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Solution Overview
Problem
Existing exhaust gas control systems face challenges in accurately determining the removal of exhaust gas control apparatuses from exhaust pipes, particularly during unstable combustion conditions, leading to potential erroneous determinations and unintentional removals.
Innovation Solution
A removal determination device that assesses the engine's output and torque levels to determine whether to execute removal determination processing, disabling it during unstable combustion and ensuring sufficient torque for accurate processing, thereby preventing erroneous determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If removal determination processing is executed based on exhaust gas temperature during unstable combustion conditions, then the system can detect PM trapping device removal, but erroneous determinations occur due to insufficient or low-temperature exhaust gas
Solution Approach 1:
The system changes the operational parameters by comparing measured engine output with estimated output to determine combustion stability before executing removal determination processing. This parameter-based gatekeeping ensures temperature difference measurements are only performed when combustion conditions are stable, thereby preventing erroneous determinations during unstable combustion states
Solution Approach 2:
The invention introduces an intermediary assessment mechanism that evaluates engine output stability as a prerequisite condition before the removal determination processing is executed. This intermediary check acts as a gatekeeper, allowing temperature-based removal detection to proceed only when combustion conditions are verified to be stable, thus preventing false positives during unstable operation
2Speed
If removal determination processing is executed during all engine operating conditions, then the system responds quickly to PM trapping device removal, but false positives occur during unstable combustion
Solution Approach 1:
The system performs preliminary assessment of engine output stability by comparing measured and estimated output values before executing the removal determination processing. This preliminary action ensures that the temperature difference measurement is only conducted when combustion conditions are stable, preventing false positives while maintaining quick detection capability when conditions are appropriate
3Reliability
If the system monitors engine output and torque to gate removal determination processing, then erroneous determinations are prevented, but device complexity increases
Solution Approach 1:
The invention leverages the existing engine control unit's capability to monitor engine output and torque for combustion control purposes. By reusing these existing monitoring functions for the additional purpose of gating removal determination processing, the system avoids adding dedicated hardware or complex new subsystems, thereby limiting the increase in device complexity while still achieving reliable error prevention
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 solution enhances the accuracy of exhaust gas control apparatus removal determination by ensuring processing is only executed when the engine is in a stable state or has sufficient torque, preventing false positives and ensuring reliable detection.
Implementation Method 1
a removal determination device for an exhaust gas control apparatus that is provided on an exhaust path of an engine installed in a vehicle and that is configured to reduce exhaust gas from the engine, the removal determination device being configured to perform removal determination processing of determining whether the exhaust gas control apparatus is removed from the exhaust path based on a change in temperature of the exhaust gas flowing into the exhaust gas control apparatus and a change in temperature of the exhaust gas flowing out from the exhaust gas control apparatus
Data Source
AI summary
An exhaust gas control apparatus removal determination device that performs an exhaust gas control apparatus removal determination processing based on a change in temperature of exhaust gas flowing into an exhaust gas control apparatus provided in an exhaust path of an engine and a change in temperature of exhaust gas flowing out. The controller determines whether the first state in which the difference between the measured value and the estimated value of the engine output is greater than or equal to a predetermined value continues for a predetermined time or longer, and determines that the engine output is in the first state. If it is determined, execution of the removal determination processing is prohibited.