Idle Mode Ignition Control for Catalytic Converter Warmup
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Solution Overview
Problem
Internal combustion engines face challenges in quickly warming up exhaust gas catalytic converters during idle mode after a cold start, leading to reduced effectiveness in pollutant reduction and increased environmental impact due to suboptimal combustion conditions.
Innovation Solution
A method that adjusts the ignition angle and air quantity of individual combustion chambers based on variables characterizing the combustion event, such as combustion location and pressure, to enhance heat output and stability, utilizing closed- or open-loop control systems to rapidly warm up the catalytic converter and maintain stable combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional ignition angle is used during idle mode after cold start, then combustion stability is maintained, but the exhaust gas catalytic converter cannot reach minimum operating temperature quickly enough
Solution Approach 1:
The ignition angle is dynamically adjusted based on real-time combustion chamber pressure measurements and thermal state of the catalytic converter. During cold start idle mode, the system retards the ignition angle to optimize heat release timing, thereby accelerating catalytic converter warmup while maintaining combustion stability through continuous feedback control.
Solution Approach 2:
The system changes the ignition angle parameter from conventional fixed values to variable values based on combustion chamber pressure and temperature conditions. By modifying this critical parameter in response to measured combustion events, the system achieves faster catalytic converter heating without sacrificing combustion reliability.
2Productivity
If the ignition angle is retarded to increase heat output for catalytic converter warmup, then warmup speed increases, but combustion stability may be compromised
Solution Approach 1:
A feedback control system continuously monitors combustion chamber pressure and thermal state, then adjusts the ignition angle accordingly. The system measures actual combustion events and uses this information to optimize ignition timing, ensuring that heat output is maximized for catalytic converter warmup while maintaining combustion stability through real-time parameter adjustment.
Solution Approach 2:
The system uses the combustion chamber pressure measurements and thermal state information to automatically optimize the ignition angle without external intervention. The control system self-adjusts based on measured combustion events, enabling the engine to self-regulate the balance between heat output for warmup and combustion stability.
3Reliability
If individual-cylinder control is implemented to compensate for cylinder variations, then combustion stability improves, but control system complexity increases
Solution Approach 1:
The control system is segmented to operate on an individual-cylinder basis, with separate control logic for each combustion chamber. By measuring and controlling ignition angle and air quantity independently for each cylinder, the system compensates for cylinder-to-cylinder variations in performance, thereby improving overall combustion stability despite the increased control complexity.
Solution Approach 2:
The system applies different control parameters to different cylinders based on their individual combustion characteristics. By tailoring ignition angle and air quantity settings to match local combustion conditions in each cylinder, the system optimizes combustion stability for each individual combustion chamber rather than using uniform settings for all cylinders.
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 enables rapid warmup of the exhaust gas catalytic converter, reducing pollutants and improving environmental impact by optimizing combustion stability and heat output, even in cold start conditions, while compensating for individual cylinder variations and external interference.
Implementation Method 1
Exhaust gas catalytic converters can advantageously improve the exhaust gases of internal combustion engines, in a manner known per se, by the fact that harmful constituents of the exhaust gas are converted into less harmful constituents by catalytic conversion
Implementation Method 2
a method for operating an internal combustion engine in an idle mode, in particular after a cold start, an ignition angle and/or an air quantity of the internal combustion engine being influenced and/or being modified as a function of an idle rotation speed of the internal combustion engine
Data Source
AI summary
A method for operating an internal combustion engine in an idle mode, in which an ignition angle and/or an air quantity of the internal combustion engine is influenced and/or is modified as a function of an idle rotation speed of the internal combustion engine. The ignition angle and/or the air quantity and/or a fuel quantity for at least one combustion chamber of the internal combustion engine is modified as a function of at least one variable characterizing a combustion event in the combustion chamber.