Powertrain Cooling System with Three-Position Valve Flow Modes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rapid warm-up of engine coolant, engine oil, and transmission oil after a cold start is challenging, especially in diesel and hybrid applications, leading to increased fuel consumption due to frictional losses.
Innovation Solution
A powertrain cooling system with a coolant pump and multiple valves that control coolant flow modes to prioritize warming of the cylinder head and engine block, utilizing heat exchangers and an exhaust heat recovery device to optimize fluid temperatures and reduce frictional losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional cooling systems are used, then cooling function is provided, but warm-up speed is slow and fuel economy deteriorates
Solution Approach 1:
The system performs preliminary warming actions by directing coolant flow priority to the cylinder head and engine block before the transmission. The controller activates the coolant pump and adjusts the three-position valve to establish optimal coolant flow paths, ensuring critical components reach operating temperature first. This preliminary warming sequence reduces frictional losses during warm-up and improves fuel economy.
Solution Approach 2:
The system dynamically adjusts coolant flow distribution based on real-time temperature conditions. The controller monitors temperatures of the cylinder head, engine block, transmission, and coolant, then dynamically repositions the three-position valve to optimize flow paths. This dynamic control enables rapid warm-up when needed while maintaining efficient cooling operation during steady-state conditions.
2Productivity
If coolant flow is distributed to all components simultaneously, then all components receive cooling, but warm-up efficiency is reduced
Solution Approach 1:
The system segments the coolant flow distribution into priority-based zones. The three-position valve divides the coolant flow paths into distinct routes: one prioritizing the cylinder head, another prioritizing the engine block, and a third providing balanced flow. This segmentation allows the system to direct coolant to the most critical warm-up needs at any given time, maximizing warm-up efficiency while minimizing energy loss from prolonged cold operation.
3Measurement precision
If a simple cooling system is used, then system complexity is low, but temperature control precision is insufficient
Solution Approach 1:
The controller serves multiple functions: it monitors temperatures from multiple sensors, determines optimal coolant flow paths, controls the three-position valve, and manages the coolant pump. This multi-functionality achieves precise temperature control for multiple components (cylinder head, engine block, transmission) without requiring separate control systems for each component, thereby limiting the increase in overall system complexity.
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 system enables efficient warm-up of powertrain components and fluids, improving fuel economy by minimizing frictional losses and maintaining optimal temperatures, thereby enhancing vehicle efficiency.
Implementation Method 1
An engine heat exchanger can be positioned in thermal communication with engine oil in the engine block
Implementation Method 2
A transmission heat exchanger can be placed in thermal communication with transmission oil in the transmission
Implementation Method 3
an exhaust heat recovery device heat exchanger (EHRDHE) can be positioned at least partially within the exhaust system and in thermal communication with the coolant flow
Data Source
AI summary
A powertrain cooling system includes a coolant pump and coolant flow passages. A first three-position valve is operatively connected with an outlet of the coolant pump and has a first, a second, and a third position to at least partially establish different coolant flow modes through the coolant flow passages. Coolant flow from the coolant pump is blocked from both the cylinder head and the engine block in a first coolant flow mode when the three-position valve is in the first position. Coolant flow from the coolant pump is provided to the cylinder head and is blocked from the engine block in a second coolant flow mode when the three-position valve is in the second position. Coolant flows from the coolant pump to the engine block and from the engine block to the cylinder head in a third coolant flow mode when the three-position valve is in the third position.