Engine Cooling System with Dynamic Coolant Flow Control
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Solution Overview
Problem
Conventional engine cooling systems face inefficiencies in engine warm-up and fuel consumption due to continuous coolant circulation to the cylinder head when the engine is cold, leading to prolonged warming periods and decreased fuel efficiency and exhaust gas quality.
Innovation Solution
An engine cooling system that continuously circulates coolant to the EGR cooler while stopping coolant flow to the cylinder head and cylinder block before the engine is warmed up, using a water chamber and coolant control valve to manage coolant flow, and integrally forming the EGR cooler water jacket with the cylinder block to reduce cooling loss and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant is continuously circulated to the cylinder head and cylinder block, then the engine cooling is maintained, but the engine warm-up speed decreases and fuel efficiency deteriorates
Solution Approach 1:
The cooling system dynamically adjusts coolant flow based on engine operating conditions. The water pump selectively supplies coolant to different water jackets (cylinder head, cylinder block, EGR cooler) depending on whether the engine is cold or warm, transitioning from static continuous circulation to dynamic conditional circulation.
Solution Approach 2:
The cooling system is segmented into separate controllable paths: a head water jacket, a block water jacket, and an EGR cooler water jacket. This allows independent control of coolant flow to each component, enabling selective cooling of the EGR cooler while stopping flow to the cylinder head and block during warm-up.
2Productivity
If coolant flow to the cylinder head is stopped during warm-up, then fuel efficiency improves, but the cooling of combustion chamber periphery and metal surfaces deteriorates
Solution Approach 1:
Different cooling strategies are applied to different parts of the engine based on local requirements. The EGR cooler receives continuous coolant flow to maintain reliable cooling, while the cylinder head and block receive no coolant during warm-up to improve fuel efficiency. This localized differential cooling resolves the contradiction between overall fuel efficiency and local cooling reliability.
3Length of stationary object
If the EGR cooler water jacket is integrally formed with the cylinder block, then the length of cooling lines is reduced and durability improves, but the device complexity increases
Solution Approach 1:
The EGR cooler water jacket is integrally formed with the cylinder block, merging two previously separate components into one. This integration eliminates the need for separate cooling lines and connections, reducing the length of cooling lines while improving durability through a unified structure.
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 accelerates engine warm-up, improves EGR cooler durability, reduces cooling loss, and enhances engine cooling efficiency and durability by optimizing coolant circulation and reducing the length of cooling lines.
Implementation Method 1
a water pump configured to pump the coolant to the block water jacket and the water chamber based on the driving state of an engine
Implementation Method 2
an exhaust gas recirculation (EGR) cooler water jacket configured to cool EGR gas of an exhaust gas recirculation (EGR) device
Implementation Method 3
a coolant circulating in the water jacket cools a periphery of a combustion chamber and metal surfaces such as peripheries of an exhaust port, a valve seat, etc.
Data Source
AI summary
An engine cooling system may include: a head water jacket that is formed within a cylinder head; a block water jacket that is formed within a cylinder block; an EGR cooler water jacket which cools EGR gas of an exhaust gas recirculation (EGR) device; a water chamber that is formed within the cylinder block, and that supplies a coolant to the head water jacket and the EGR cooler water jacket; and a water pump pumping the coolant to the block water jacket and the water chamber based on the driving state of an engine.