Exhaust Gas Sensor Diagnostic Module Control
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Solution Overview
Problem
Existing diagnostic modules for exhaust gas sensors in vehicles lack efficient control mechanisms to manage operating conditions, leading to potential errors and inefficiencies in sensor functionality, particularly during engine speed variations, fuel cut-off, exhaust brake mode activation, tow/haul mode, and transmission gear shifts.
Innovation Solution
A controller-enabled diagnostic module that performs signal range verification of the oxygen sensor and is dynamically enabled or disabled based on predefined operating parameters and entry conditions, such as engine speed, fuel delivery, exhaust brake mode, tow/haul mode, and transmission gear shifts, to optimize sensor functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diagnostic module is continuously enabled to monitor exhaust gas sensor signals, then measurement precision and reliability are improved, but device complexity and energy consumption increase
Solution Approach 1:
The diagnostic module's operational state is dynamically adjusted based on engine operating conditions. The controller enables the diagnostic module only when specific conditions are met (engine running, not in fuel cut-off mode, exhaust brake not activated, tow/haul mode not engaged), transforming a static continuous monitoring system into a dynamic conditional monitoring system that reduces complexity while maintaining necessary measurement precision.
Solution Approach 2:
The system changes the operational parameter of the diagnostic module from a constant enabled state to a variable state based on multiple engine parameters (engine speed, fuel delivery status, exhaust brake status, transmission gear). By monitoring and responding to changes in these parameters, the system achieves precise control over when diagnostic functions are active, balancing measurement needs with system simplicity.
2Reliability
If the diagnostic module operates during all engine conditions, then reliability of emissions measurement is improved, but fuel efficiency deteriorates due to unnecessary energy consumption
Solution Approach 1:
Instead of continuous operation, the diagnostic module performs periodic diagnostic actions only during appropriate engine operating cycles. The controller periodically evaluates engine conditions and enables the diagnostic module only during suitable periods when the engine is running under normal operating conditions, eliminating energy waste during fuel cut-off, exhaust brake, or tow/haul modes while maintaining measurement reliability when needed.
Solution Approach 2:
The patent extracts the diagnostic module's operational requirement from the set of all possible engine conditions and identifies only the specific conditions under which diagnostics should run. By removing (taking out) the diagnostic function from periods when the engine is in fuel cut-off mode, exhaust brake mode, or tow/haul mode, the system eliminates unnecessary energy consumption while preserving reliability during appropriate operating conditions.
3Productivity
If the diagnostic module is enabled during fuel cut-off mode, then comprehensive monitoring is improved, but measurement accuracy deteriorates due to obstructed exhaust flow
Solution Approach 1:
The controller performs preliminary checking of engine operating conditions before enabling the diagnostic module. By detecting fuel cut-off mode, exhaust brake activation, or tow/haul mode in advance, the controller prevents (takes anti-action against) the enabling of the diagnostic module during these conditions, avoiding inaccurate measurements that would result from obstructed exhaust flow or atypical operating conditions.
Solution Approach 2:
The system performs preliminary evaluation of multiple engine parameters (engine speed relative to fuel cut-off threshold, fuel delivery status, exhaust brake status, transmission gear) before activating the diagnostic module. This preliminary action ensures that the diagnostic module is only enabled when exhaust flow conditions are normal and suitable for accurate oxygen sensor measurements, preventing comprehensive monitoring during inappropriate conditions.
Data Source
AI summary
A method and apparatus for controlling a diagnostic module for an exhaust gas sensor in a vehicle is provided. The exhaust gas sensor is located in an exhaust pathway in the vehicle. The diagnostic module may be configured to perform a signal range verification of an oxygen sensor portion of the exhaust gas sensor. A controller is operatively connected to the exhaust gas sensor and to the vehicle engine. The controller disables the diagnostic module when one or more entry conditions are satisfied. The entry conditions may include requiring the engine speed to be greater than a fuel cut-off threshold, the fuel cut-off threshold being the engine speed at which the fuel to the engine is terminated. The entry conditions may include: no fuel being delivered to the engine; and a vehicle exhaust brake mode being activated such that the exhaust pathway from the engine is obstructed.