Turbocharged Engine Coolant System with Exhaust Pumping Loss Reduction
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Solution Overview
Problem
Existing engine structures face challenges in efficiently managing intake air and exhaust gas flow passages, particularly with turbochargers, leading to increased exhaust pumping loss and reduced output torque in low and medium speed regions due to exhaust interference and inefficient cooling systems.
Innovation Solution
The engine structure incorporates a combination exhaust system with separate turbo and natural exhaust systems, along with a water-cooled supercharger and integrated cooling system, utilizing a shared coolant passage to enhance cooling efficiency and reduce exhaust pumping loss, and a unified intake and exhaust water-cooling system to improve engine performance across various speed regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a turbocharger is used to compress intake air, then engine power is improved, but exhaust pumping loss increases in low and medium speed regions
Solution Approach 1:
The exhaust system is divided into separate turbo and natural exhaust systems, allowing exhaust gas to be routed through the turbocharger only when needed for power enhancement, while natural exhaust flow is maintained in low and medium speed regions to reduce pumping loss
Solution Approach 2:
The system dynamically switches between turbo and natural exhaust modes based on engine operating conditions, enabling optimal exhaust flow management that reduces pumping loss in low and medium speed regions while maintaining power benefits when turbocharging is required
2Temperature
If a separate cooling system is provided for each component, then cooling effectiveness is improved, but system complexity increases
Solution Approach 1:
Multiple cooling systems (intake air cooling, exhaust gas cooling, turbocharger cooling, supercharger cooling) are merged into a single integrated water-cooling system that uses a common coolant circuit with strategically placed coolant passages to cool all components efficiently
Solution Approach 2:
The coolant system is designed to perform multiple cooling functions simultaneously through a unified circuit, where the same coolant flow path serves to cool the intake air passage, exhaust passage, turbocharger, and supercharger, reducing overall system complexity while maintaining effective cooling
3Duration of action of moving object
If the supercharger operates for extended duration, then low speed torque is improved, but overheating risk increases
Solution Approach 1:
A dedicated coolant passage acts as an intermediary cooling mechanism between the supercharger and the overall cooling system, providing direct thermal management that enables extended operating duration without overheating
Solution Approach 2:
The supercharger is equipped with its own integrated coolant cooling system that provides continuous thermal management during operation, allowing the supercharger to self-regulate its temperature and operate for extended periods without external intervention
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 configuration reduces exhaust pumping loss, enhances output torque, particularly in low and medium speed regions, and extends the operating duration of the supercharger while preventing overheating, thereby improving overall engine efficiency and stability.
Implementation Method 1
Each of the turbocharger, the first runner, and the second runner may include a water jacket through which the coolant flows
Implementation Method 2
the radiator may discharge, to an outside, heat of the coolant that has absorbed exhaust heat while passing through the turbocharger, the first runner, and the second runner
Implementation Method 3
the radiator may discharge, to an outside, heat of the coolant
Implementation Method 4
The intake and exhaust water-cooling system may include a radiator and a water pump so that circulation of coolant separated from coolant for cooling the combustion chambers in the engine may be formed
Implementation Method 5
an intercooler provided on an intake air passage of the engine and cooling, using the coolant, the intake air that has passed through the turbocharger or the supercharger
Data Source
AI summary
An engine structure for a vehicle includes: a turbocharger rotating by a flow of exhaust gas and compress intake air; a first runner communicating with at least one of a plurality of combustion chambers which are formed in an engine and communicating with the turbocharger; a second runner communicating with remaining combustion chambers which are not in communication with the first runner; and a supercharger rotating by a motor, which is cooled by a coolant, and compressing intake air.