Dual Coolant Path Engine Cooling for Warm-Up and Knock Control
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Solution Overview
Problem
Existing engine cooling systems fail to prevent fuel efficiency reduction due to slow temperature rise in the cylinder block and cylinder head before warm-up, and excessive temperature rise post-warm-up, leading to unburned fuel increase and knocking.
Innovation Solution
An engine cooling device with dual coolant paths and flow rate control mechanisms to manage coolant flow rates based on temperature, bypassing the radiator and incorporating an EGR cooler to regulate coolant circulation through the cylinder block, cylinder head, and exhaust cooling portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the coolant circulation path is simplified to improve system structure, then device complexity is reduced, but the ability to control temperature rise in different engine conditions deteriorates
Solution Approach 1:
The coolant circulation system is divided into multiple independent paths: a first path bypassing the radiator for warm-up operation, and a second path through the radiator for normal operation. This segmentation allows each path to be optimized for its specific function while maintaining overall system reliability.
Solution Approach 2:
The system employs a flow rate control mechanism that dynamically switches between the first and second coolant paths based on engine temperature conditions. The controller adjusts coolant flow distribution to match operational requirements, transitioning from warm-up mode to normal operation mode as needed.
2Temperature
If the coolant flow rate is increased to prevent excessive temperature rise, then temperature control is improved, but fuel efficiency deteriorates due to increased energy consumption
Solution Approach 1:
The system changes the coolant flow rate parameter dynamically based on engine temperature conditions. During warm-up, the flow rate is reduced to minimize energy consumption, while during normal operation, the flow rate is adjusted to maintain optimal temperature control, preventing excessive energy consumption.
Solution Approach 2:
The controller receives temperature feedback from temperature sensors and adjusts the coolant flow rate accordingly. When the engine reaches operating temperature, the system transitions to using the radiator path with adjusted flow rates to maintain temperature control while optimizing energy efficiency.
3Loss of energy
If the engine operates at low temperature for extended periods, then fuel efficiency improves, but unburned fuel increases causing reduction in fuel efficiency
Solution Approach 1:
The system performs preliminary warming action by directing coolant through the first path (bypassing the radiator) during cold-start conditions. This preliminary circulation ensures rapid heating of the engine components to operating temperature, preventing unburned fuel accumulation while maintaining fuel efficiency.
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
Prevents fuel efficiency reduction by controlling coolant flow to manage temperature rises and prevent knocking, ensuring efficient engine operation.
Implementation Method 1
a radiator that dissipates heat of a coolant
Implementation Method 2
an exhaust cooling portion that cools an exhaust gas of the engine
Implementation Method 3
an EGR cooler that cools an EGR gas of the engine
Data Source
AI summary
An engine cooling device includes: a block lower portion that is a lower portion of a cylinder block; a block upper portion that is an upper portion of the cylinder block; a cylinder head of the engine; an exhaust cooling portion that cools an exhaust gas of the engine; a radiator that dissipates heat of a coolant; a first path that bypasses the radiator to cause the coolant to circulate through the block lower portion, the block upper portion, the cylinder head, and the exhaust cooling portion; a second path that bypasses the block lower portion to cause the coolant to circulate through the radiator, the block upper portion, the cylinder head, and the exhaust cooling portion; and a flow rate control mechanism that increases a flow rate of the coolant flowing through the second path with respect to a flow rate of the coolant flowing through the first path.