Vehicle Cooling Control Valve Routing for Rapid Engine Warm-Up
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Solution Overview
Problem
Current vehicle cooling systems face inefficiencies in fuel consumption due to inadequate coolant temperature control, leading to increased engine viscosity, frictional forces, and prolonged catalyst activation times, especially during cold starts, which affect engine performance and fuel efficiency.
Innovation Solution
A method for controlling a vehicle cooling system that adjusts coolant flow through a control valve in warm-up mode, utilizing multiple operational modes to rapidly increase coolant temperature by routing coolant through various components like the EGR cooler, oil cooler, and heater, ensuring efficient engine warming and improved fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coolant control valve is applied to control several cooling elements, then the device complexity is reduced, but the temperature control precision of each component deteriorates
Solution Approach 1:
The single coolant control valve is segmented into multiple independent control valves, each responsible for a specific cooling element (engine, EGR cooler, oil cooler, heater, radiator). This segmentation allows precise temperature control for each component while maintaining manageable system complexity through modular design.
Solution Approach 2:
Each control valve is assigned to control the coolant temperature for its specific local component based on individual temperature requirements. The engine control valve, EGR cooler control valve, oil cooler control valve, heater control valve, and radiator control valve each optimize coolant flow for their respective components, achieving local temperature optimization.
2Temperature
If coolant temperature is maintained low to prevent overheating, then cooling performance is improved, but fuel efficiency deteriorates due to increased viscosity and friction
Solution Approach 1:
The control valves dynamically adjust coolant flow based on real-time temperature sensors and operating conditions. During cold starts, the system allows higher coolant temperatures to reduce viscosity and improve fuel efficiency, while during high-load operations, it actively cools components to prevent overheating. This dynamic adjustment optimizes the trade-off between temperature stability and energy consumption.
Solution Approach 2:
The system changes coolant flow parameters (flow rate, temperature) based on operating mode. In warm-up mode, coolant flow is restricted to allow temperature rise for better fuel efficiency. In cooling mode, flow is increased to maintain safe operating temperatures. The control valves adjust these parameters continuously based on sensor feedback.
3Temperature
If coolant flow is increased to improve cooling efficiency, then temperature control is improved, but fuel efficiency deteriorates due to prolonged catalyst activation time
Solution Approach 1:
The control system performs preliminary warming of the coolant and exhaust gases before catalyst activation is needed. By pre-heating the coolant circulation system and managing exhaust temperature rise, the system reduces the time required for catalyst activation while maintaining effective cooling capability once the catalyst is operational.
Solution Approach 2:
The control valves operate in periodic cycles, alternating between cooling phases and warm-up phases based on engine operating conditions. During transient conditions, the system periodically adjusts coolant flow to balance cooling needs with catalyst activation requirements, using pulse-width modulation of the control valves to achieve optimal timing.
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 enhances coolant temperature management, reduces fuel consumption, and optimizes engine warming, thereby improving fuel efficiency and marketability by ensuring rapid engine warm-up and tailored heating or cooling based on user demand.
Implementation Method 1
a coolant absorbs the heat energy while circulating through the engine, a heater, and a radiator
Implementation Method 2
a coolant circulates through the engine, the EGR cooler, the oil cooler, the heater, and the radiator by operation of a water pump
Data Source
AI summary
A method for controlling a cooling system for a vehicle is provided. The system includes an engine, an EGR cooler, an oil cooler, a heater, a radiator, and a controller. The engine, the EGR cooler, the oil cooler, the heater, and the radiator are respectively connected through a coolant line and coolant circulates through the engine, the EGR cooler, the oil cooler, the heater, and the radiator by operation of a water pump. The controller receives the coolant from the engine and operates a control valve connected with the oil cooler, the heater, and the radiator. The method includes sensing driving conditions and operating the control valve when a warm mode is required to rapidly warm up the engine based on the sensed driving conditions. The control valve is operated based on modes that are controlled depending on a coolant temperature, and among modes, one is iteratively performed.