Exhaust Gas Temperature Correction for Engine Component Protection
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Solution Overview
Problem
Existing methods for managing exhaust gas temperatures in internal combustion engines, particularly in gasoline engines, fail to effectively prevent component damage due to high temperatures at exhaust gas valves, leading to inefficiencies and potential damage to components like catalytic converters and turbochargers.
Innovation Solution
A method using an inverted characteristic map to determine correcting variables for charge, fuel/air ratio, and water injection to maintain exhaust gas temperatures below a predefined maximum, employing a real-time capable exhaust gas temperature model to adjust these variables dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cylinder charging is limited or the combustion chamber mixture is enriched to lower exhaust gas valve temperatures, then component temperature is reduced, but engine efficiency deteriorates
Solution Approach 1:
Instead of using traditional forward characteristic maps that require iterative searching to find correcting variables for temperature reduction, the patent inverts the characteristic map structure. The inverted map directly provides correcting variables (charge correction, lambda correction, water injection quantity) as functions of temperature difference and operating parameters, eliminating the need for iterative procedures and enabling direct calculation of efficiency-minimal correction measures.
Solution Approach 2:
The patent changes the parameter representation by inverting the characteristic map from (correcting variables → temperature) to (temperature difference → correcting variables). This parameter inversion allows direct determination of minimal correction measures required to achieve temperature reduction while maintaining engine efficiency.
2Speed
If late ignition angle adjustments are made for driving dynamics control, then driving performance is improved, but exhaust gas temperature increases
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the temperature difference between actual exhaust gas valve temperature and maximum permissible temperature. Based on this feedback, the inverted characteristic map dynamically provides correcting variables to counteract temperature increases from late ignition adjustments, allowing the system to maintain both driving performance and temperature control.
3Temperature
If enriching or charging limitation is applied to protect components, then component temperature is reduced, but additional enriching is required to compensate for efficiency deterioration
Solution Approach 1:
The patent performs preliminary calculation of the minimal enriching required to compensate for efficiency deterioration caused by temperature protection measures. The inverted characteristic map pre-determines the exact enriching quantity needed based on operating parameters and temperature difference, allowing the system to apply only the necessary amount of enriching rather than excessive enriching.
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 component damage by maintaining exhaust gas temperatures within safe limits, enhancing engine efficiency and reducing the need for inefficient measures like late ignition adjustments.
Implementation Method 1
values of the temperature occurring at the exhaust gas valves during operation of the internal combustion engine are read from a first characteristic map
Implementation Method 2
the temperature at the exhaust gas valve can also be lowered by injecting water into the intake tract or directly into the combustion chambers
Implementation Method 3
A real-time capable exhaust gas temperature model is also inherently known and can be modularly adapted to the respective configuration of the system
Data Source
AI summary
A method for generating correcting variables for the operation of an internal combustion engine which comprises exhaust gas valves and which comprises at least one component, through which the exhaust gas of the internal combustion engine flows, wherein values of the temperature occurring at the exhaust gas valves during operation of the internal combustion engine are read out from a first characteristic map. The method is characterized in that values of correcting variables are read out from a further characteristic map, which is at least partially an inverted characteristic map with respect to the first characteristic map, which are predefined such that specified maximum values of the component temperature are not exceeded for the component through which the exhaust gas of the internal combustion engine flows. Respective independent claims are directed to a device configured for performing the method, a computer program configured for performing the method, and a machine-readable storage medium with a computer program stored thereon.