Throttle Signal Control for High-Compression Knock Prevention
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Solution Overview
Problem
Internal combustion engines face challenges in operating at high compression ratios due to the risk of detonation, knocking, or pinking, which can cause engine damage, and existing solutions like knock sensors only react after damage occurs, increasing manufacturing costs.
Innovation Solution
A controller intercepts throttle signals to modify them, using map data and calculations to prevent high compression ratios from causing detonation or knocking by limiting throttle opening, allowing safe operation with higher efficiency and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate systems (emissions control, exhaust gas recirculation, diesel particulate filter) are used to meet emission standards, then emission requirements are met, but system complexity and cost increase
Solution Approach 1:
The patent combines multiple emission control functions into a single integrated EGR system. The EGR valve integrates emissions control functionality, the EGR cooler consolidates cooling functions, and the DPF integrates particulate filtration. This merging reduces the number of separate components and systems while maintaining comprehensive emission control capabilities, directly resolving the contradiction between emission effectiveness and system complexity
Solution Approach 2:
The EGR system is designed to perform multiple functions simultaneously: it controls emissions, recirculates exhaust gas, cools exhaust gases, and filters particulates. The integrated design allows a single system to replace what would traditionally require multiple separate systems, reducing complexity while maintaining universal emission control effectiveness
2Device complexity
If conventional EGR systems without advanced control are used, then system simplicity is maintained, but nitrogen oxide formation increases and emission standards cannot be met
Solution Approach 1:
The system incorporates sensors that continuously monitor exhaust gas conditions, EGR valve position, and emission parameters. This feedback information is fed to the control unit which adjusts the EGR valve opening and timing in real-time to optimize the balance between nitrogen oxide formation and emission control. The feedback mechanism enables precise control without requiring excessive system complexity
Solution Approach 2:
The EGR system uses dynamic control of the EGR valve opening based on operating conditions such as engine load, speed, and temperature. The valve opening is continuously adjusted to optimize exhaust gas recirculation levels, preventing excessive nitrogen oxide formation while maintaining emission control effectiveness. This dynamic adjustment allows the system to adapt to varying conditions without requiring multiple fixed systems
3Object-generated harmful factors
If high EGR rates are used to control nitrogen oxides, then emission standards are met, but available power and fuel efficiency decrease
Solution Approach 1:
The system dynamically adjusts EGR rates based on real-time engine operating conditions including load, speed, and temperature. During high load conditions, the EGR rate is reduced to maintain power output, while during low load conditions, higher EGR rates are applied to control nitrogen oxides. This dynamic control allows the system to optimize the trade-off between emission control and power maintenance across all operating conditions
Solution Approach 2:
The system changes multiple parameters simultaneously including EGR valve opening degree, EGR timing, and EGR temperature to optimize nitrogen oxide control while maintaining power. By coordinating changes in these parameters rather than relying solely on high EGR rates, the system achieves emission control without the associated power loss
4Object-generated harmful factors
If EGR cooling is implemented to reduce nitrogen oxide formation, then emission standards are met, but system complexity and energy consumption increase
Solution Approach 1:
The EGR cooler is integrated with the existing EGR system architecture, combining cooling functionality with the exhaust gas recirculation path. This integration allows the cooling function to be achieved without adding separate independent systems, reducing overall complexity while still providing the temperature control necessary to reduce nitrogen oxide formation
Solution Approach 2:
The EGR system utilizes the exhaust gas itself as the cooling medium, where cooler exhaust gases from the engine are used to cool the EGR intake air. This self-service cooling approach eliminates the need for external cooling systems or additional energy input, reducing system complexity and energy consumption while still achieving effective nitrogen oxide control
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
Enables engines to operate efficiently and safely at higher compression ratios by preventing detonation or knocking, reducing emissions and improving fuel efficiency without the need for additional sensors or complex manufacturing changes.
Implementation Method 1
The EGR valve (20) is controlled by a control unit (30) according to a control strategy for recirculating exhaust gas to the intake manifold (13)
Implementation Method 2
The EGR cooler (23) cools the exhaust gas in a heat exchanger
Implementation Method 3
The DPF (25) filters the exhaust gas in a particulate filter
Implementation Method 4
The catalytic converter (24) converts the nitrogen oxides in the exhaust gas to nitrogen and oxygen
Data Source
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AI summary
The present invention relates to internal combustion engines. More particularly, the present invention relates to an arrangement whereby internal combustion engines can be operated more efficiently at higher compression pressures. Aspects and/or embodiments seek to provide a method and/or apparatus and/or system for using very high compression ratios in internal combustion engines while preventing damage from pinking or knocking.