Lambda Sensor Control for Catalyst Oxygen Storage Balance
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Solution Overview
Problem
Existing methods for adjusting the oxygen filling level of an oxygen storage in an exhaust gas aftertreatment device are inaccurate and can lead to excessive fuel consumption and pollutant emissions.
Innovation Solution
A method that uses a combination of lambda control and trim control based on measurements from upstream and downstream lambda sensors to adjust the oxygen filling level to a target level without overshooting, determining the oxygen balance value and correcting the pilot oxygen amount to achieve precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to adjust the oxygen filling level, then the control process is simple, but the accuracy is insufficient and fuel consumption increases
Solution Approach 1:
The patent implements a feedback control mechanism using lambda sensors to continuously monitor the actual oxygen filling level of the catalyst and compares it with the target level. Based on the difference (deviation), the control unit adjusts the fuel injection amount dynamically, creating a closed-loop control system that ensures accurate oxygen filling while minimizing fuel waste from overshooting or insufficient filling.
Solution Approach 2:
The patent changes the control parameter from fixed fuel injection patterns to dynamic adjustment based on real-time oxygen storage capacity measurements. By continuously adapting the fuel injection amount according to the actual oxygen filling state, the system achieves precise control of the oxygen filling level while optimizing fuel consumption.
2Manufacturing precision
If traditional lambda control is used, then the system is simple to operate, but the oxygen filling level cannot be controlled precisely
Solution Approach 1:
The patent segments the control process into distinct phases: initial fuel injection to charge the catalyst with oxygen, followed by a control phase where fuel injection is adjusted based on lambda sensor feedback. This segmentation allows for precise control of the oxygen filling level while maintaining manageable system complexity through structured control logic.
Solution Approach 2:
The patent introduces feedback control by continuously monitoring the actual oxygen filling level via lambda sensors and adjusting the fuel injection amount accordingly. This feedback mechanism enables precise control of the oxygen filling level while the control unit manages system complexity through automated regulation based on real-time data.
3Speed
If the oxygen filling level is adjusted quickly, then the response time is reduced, but overshooting may occur reducing accuracy
Solution Approach 1:
The patent uses feedback control with lambda sensors to continuously monitor the oxygen filling level and adjust fuel injection in real-time. This prevents overshooting by immediately detecting when the target level is reached or exceeded, allowing for quick response while maintaining accuracy through continuous regulation based on actual measurements.
Solution Approach 2:
The patent implements dynamic control by continuously adapting the fuel injection amount based on the current oxygen filling state rather than using fixed patterns. This dynamic adjustment enables the system to respond quickly to changes while maintaining precision, as the control algorithm adapts the injection rate to prevent overshooting based on real-time oxygen storage capacity measurements.
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
This method allows for accurate adjustment of the oxygen filling level to optimize the efficiency of the exhaust gas aftertreatment device, reducing fuel consumption and pollutant emissions while ensuring quick and precise control.
Implementation Method 1
a first measured value of a first lambda sensor arranged upstream of the exhaust gas aftertreatment direction and based on a second measured value of a second lambda sensor arranged downstream of the exhaust gas aftertreatment direction
Implementation Method 2
an exhaust gas aftertreatment device for aftertreatment of the exhaust gas
Implementation Method 3
The method includes decoupling the internal combustion engine from a drive train, driving the internal combustion engine by means of an electric motor, supplying a lean fuel-air mixture to the catalyst until the catalyst is completely charged with oxygen
Data Source
AI summary
A method for operating a drive device which has a drive unit that generates exhaust gas and an exhaust gas aftertreatment device for aftertreatment of the exhaust gas. A composition of a fuel-air mixture used for operating the drive unit is determined at least temporarily by a lambda control based on a first measured value of a first lambda sensor arranged upstream of the exhaust gas aftertreatment device and based on a second measured value of a second lambda sensor arranged downstream of the exhaust gas aftertreatment device.