Oxygen Pump Cell Feed-Forward Control for Transient Engine Sensors
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Solution Overview
Problem
Existing sensors in internal combustion engines and exhaust gas after-treatment systems face unreliable sensor signals during transient operation due to rapid oxygen content variations, leading to unstable control loops and reduced reliability, especially in Diesel engines.
Innovation Solution
Implementing a feed-forward control method for oxygen pump cells using engine operation data such as air/fuel ratio, oxygen concentration, NOx concentration, and physical exhaust gas characteristics to anticipate and compensate for disturbances, thereby improving the controller's performance and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonlinear filter techniques are used to handle reduced reliability during transient phases, then sensor signal reliability is improved, but sensor response speed and bandwidth are significantly slowed down
Solution Approach 1:
The invention uses feed-forward control to anticipate transient phases before they occur. By detecting transient conditions early and pre-adjusting the pump current accordingly, the system prepares the sensor signal processing in advance, avoiding the need for heavy nonlinear filtering during the transient phase itself, thus maintaining both reliability and response speed
Solution Approach 2:
The invention implements feedback control by continuously monitoring the sensor signal quality and engine operating conditions. When transient phases are detected, the feedback loop adjusts the pump current to maintain stable sensor signals, allowing the system to maintain reliability without requiring excessive filtering that would slow down the response
2Productivity
If heavy disturbances in control loops are allowed during transient operation, then sensor bandwidth is maintained, but control stability is lost
Solution Approach 1:
The invention applies preliminary anti-action by using feed-forward control to counteract the effects of transient disturbances before they can destabilize the control loop. The system anticipates the disturbances during transient phases and applies compensating actions in advance, allowing the control loop to maintain both stability and bandwidth during transient operation
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 approach accelerates sensor response, enhances accuracy during transient phases, and extends the control loop bandwidth, allowing for more reliable and efficient emission control in internal combustion engines.
Implementation Method 1
These sensors contain electrochemical pumps, where oxygen ions are pumped through a solid-state electrolyte cell.
Implementation Method 2
oxygen ions are pumped through a solid-state electrolyte cell
Implementation Method 3
The exhaust gas enters the measurement cavity through a diffusion barrier
Data Source
AI summary
It is described a method for controlling an oxygen pump cell of a sensor in an internal combustion engine or in the exhaust gas after treatment system of such an engine, comprising the step of adding, to a feedback control of the current in the pump cell, a further feed-forward control path estimating an expected oxygen pump current on the basis of characteristics of the exhaust gas composition calculated from engine operation data.