Lambda Sensor Poison Removal via Dynamic Heating Control
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Solution Overview
Problem
Diesel engines face a dilemma in reducing both nitrogen oxide (NOx) and particulate matter emissions, as control schemes for one often increase the other, and lambda sensors' electrodes can be poisoned, leading to deteriorated signal outputs.
Innovation Solution
An apparatus and method that includes a lambda sensor and a control unit to differentiate heating temperatures and times based on lambda signal outputs, heating the sensor when specific conditions are met to remove poisons and prevent electrode degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lambda sensor is heated continuously at high temperature to remove poison, then the poison removal effect is improved, but the energy consumption increases and may affect vehicle behavior
Solution Approach 1:
The patent implements periodic heating cycles rather than continuous heating. The control unit activates the heater in specific cycles (heating ON period followed by heating OFF period) to remove poison from the lambda sensor electrode while controlling energy consumption. This periodic action allows the sensor to be regenerated without continuously consuming excessive energy.
Solution Approach 2:
The patent dynamically adjusts heating parameters (temperature and time) based on the detected poison level. When poison is detected through abnormal lambda signals, the control unit increases heating temperature and extends heating duration. When poison levels are normal, heating is reduced or stopped. This parameter adaptation resolves the contradiction by applying high temperature only when necessary for poison removal.
2Reliability
If the heating temperature and time are increased to remove severe poison, then the poison removal effectiveness is improved, but the risk of sensor damage and energy waste increases
Solution Approach 1:
The patent employs dynamic adjustment of heating parameters based on real-time sensor feedback. The control unit monitors lambda signals continuously and adjusts heating temperature and duration according to the detected poison level. This dynamic approach allows aggressive heating when needed for severe poison while applying milder heating for minor contamination, thereby preventing sensor damage while maintaining effective poison removal.
Solution Approach 2:
The control unit uses feedback from the lambda sensor signals to determine the appropriate heating intensity. When the lambda signal indicates severe poison contamination (abnormal voltage patterns), the system increases heating parameters. When signals are within normal ranges, heating is minimized. This feedback mechanism ensures that high temperature heating is applied only when necessary, preventing unnecessary sensor damage while effectively removing poison.
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
Effectively prevents lambda sensor signal degradation by targeted heating, allowing for accurate determination of sensor failure and reducing NOx and particulate matter emissions without adverse effects on vehicle behavior or fuel consumption.
Implementation Method 1
a heater heating the electrode; and a control unit controlling the heater to heat the electrode
Implementation Method 2
the control unit increasing the heating temperature and the heating time step-by-step as the lambda signal is increased
Data Source
AI summary
An apparatus for removing a poison of a lambda sensor includes: a lambda sensor detecting an oxygen concentration included in an exhaust gas; and a control unit differentiating a heating temperature and a heating time to remove poison from the lambda sensor depending on a lambda signal output from the lambda sensor when a heating condition of the lambda sensor and an overrun section of an engine are satisfied. By heating the lambda sensor depending on the magnitude of the lambda signal output from the lambda sensor, the lambda sensor may be inhibited from being degraded by combusting the material poisoned to the electrode of the lambda sensor and the failure of the lambda sensor may be correctly determined.