Internal Combustion Engine Intake Air Temperature Control
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Solution Overview
Problem
Existing internal combustion engines face challenges in expanding the operating region for lean mode to high load conditions while maintaining combustion stability, particularly due to fluctuations in EGR gas amounts and intake air temperature adjustments.
Innovation Solution
An internal combustion engine with an EGR apparatus and intake air temperature adjustment system that switches between stoichiometric EGR mode and lean mode, using a control apparatus to adjust intake air temperature and engine water temperature to optimize combustion conditions, ensuring stable combustion and improved intake efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a large amount of EGR gas is introduced during stoichiometric EGR mode to improve fuel consumption, then fuel efficiency is improved, but combustion stability deteriorates due to fluctuations in EGR amount between cycles
Solution Approach 1:
The patent changes the temperature parameter of intake air to stabilize combustion. By controlling intake air temperature to be higher (e.g., 30-50°C) during stoichiometric EGR mode, the combustion stability is improved while allowing large EGR amounts for fuel efficiency. The control system adjusts intake air temperature based on operation mode detection.
2Productivity
If intake air temperature is lowered to improve intake efficiency and expand lean mode operating region, then intake efficiency is improved, but combustion stability deteriorates due to temperature fluctuations
Solution Approach 1:
The patent applies parameter changes by setting different temperature ranges for different operation modes. For lean mode, lower temperatures (e.g., 20-40°C) improve intake efficiency and expand operating region. For stoichiometric EGR mode, higher temperatures (e.g., 30-50°C) stabilize combustion. The control system dynamically adjusts temperature based on detected operation mode.
3Use of energy by moving object
If the operating region for lean mode is expanded to high load conditions, then fuel consumption performance is improved, but combustion stability deteriorates due to destabilization of combustion
Solution Approach 1:
The patent uses parameter changes (temperature control) to enable lean mode operation at high load conditions. By controlling intake air temperature within appropriate ranges (20-40°C), the system expands the lean mode operating region to high load areas while maintaining combustion stability through temperature management.
4Power
If intake air temperature is adjusted according to load state, then combustion performance is improved, but the ability to maintain stable combustion during mode switching deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing distinct temperature ranges for different operation modes: higher temperatures (30-50°C) for stoichiometric EGR mode to stabilize combustion, and lower temperatures (20-40°C) for lean mode to improve intake efficiency. The control system detects operation mode and adjusts temperature parameters accordingly, ensuring stable combustion during mode transitions.
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
The solution allows for expanded operation in lean mode at high load conditions while maintaining combustion stability and reducing the occurrence of knocking and unburned hydrocarbon emissions, by appropriately adjusting intake air and engine water temperatures.
Implementation Method 1
an internal combustion engine equipped with a supercharger and a water-type intercooler
Implementation Method 2
an EGR apparatus that recirculates a part of exhaust gas to an intake passage
Implementation Method 3
a control apparatus that operates the intake air temperature adjustment apparatus so that a temperature of intake air that enters a combustion chamber enters a first temperature region
Data Source
AI summary
An internal combustion engine includes an intake air temperature adjustment apparatus that adjusts the temperature of intake air, and a control apparatus that operates at least the intake air temperature adjustment apparatus. When the internal combustion engine operates in a stoichiometric EGR mode, the control apparatus operates the intake air temperature adjustment apparatus so that the temperature of intake air entering a combustion chamber enters a first temperature region. When the internal combustion engine operates in a lean mode, the control apparatus operates the intake air temperature adjustment apparatus so that the temperature of intake air entering a combustion chamber enters a second temperature region that is a lower temperature region than the first temperature region.