Engine Coolant Flow Control for Cylinder Wall Temperature
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Solution Overview
Problem
Engine start-stop events in vehicles lead to thermal energy being directed away from the combustion chamber, cooling cylinder walls and reducing fuel efficiency, as existing systems struggle to balance heating and cooling needs while maintaining cylinder wall temperature and fuel efficiency.
Innovation Solution
A system that includes a coolant management module and a coolant control module to determine engine status and direct engine coolant flow using coolant control valves, either to the heater or engine, based on temperature measurements to optimize cylinder wall temperature and maintain fuel efficiency during engine off events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal energy is directed to the cabin heater during engine off events, then heating performance is improved, but cylinder wall temperature decreases and fuel efficiency deteriorates
Solution Approach 1:
The system directs coolant flow selectively to specific engine zones based on local temperature requirements. During engine off events, coolant is directed to non-cylinder zones (such as the heater core) while maintaining thermal energy in cylinder wall zones, achieving localized thermal management that satisfies both heating performance and fuel efficiency requirements
Solution Approach 2:
The coolant control valves dynamically adjust coolant flow distribution in real-time based on engine temperature, heater demand, and operating conditions. This dynamic control allows the system to optimize the balance between providing cabin heating and maintaining cylinder wall temperature for fuel efficiency across varying operational scenarios
2Temperature
If coolant flow is directed to the heater during engine off events, then cabin heating is improved, but engine cooling needs may not be met
Solution Approach 1:
The coolant control system is divided into multiple independently controllable zones with separate coolant control valves. This segmentation allows the system to direct coolant flow to different engine zones or the heater core based on specific thermal management needs, providing versatile temperature regulation during engine off events
Solution Approach 2:
The system dynamically switches coolant flow paths between the heater core and engine zones based on real-time temperature sensor feedback and control logic, enabling adaptive response to both heating demands and engine cooling requirements during engine off periods
3Measurement precision
If multiple coolant control valves are used to direct coolant flow, then temperature control precision is improved, but system complexity increases
Solution Approach 1:
Each coolant control valve manages a specific engine zone or thermal path, providing localized temperature control precision. The distributed valve architecture enables independent control of different coolant flow paths, achieving precise thermal management in each zone while maintaining overall system functionality
Solution Approach 2:
Temperature sensors positioned at multiple locations provide feedback to the control system, which adjusts coolant control valve positions to maintain target temperatures. This closed-loop feedback control enables precise temperature regulation despite the increased complexity of multiple valves
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 effectively maintains engine temperature and fuel efficiency by directing coolant flow to either heat the cabin or cool the engine, ensuring optimal performance and reducing fuel consumption during engine start-stop cycles.
Implementation Method 1
thermal energy from the combustion chamber is directed to other system components, such as a cabin heater
Implementation Method 2
direct engine coolant flow from the respective location to one of the heater and engine
Data Source
AI summary
A system includes a coolant management module that, determines whether an engine of a vehicle is off, determines, in response to a determination that the engine is off, whether a heater associated with the engine is on, receives one of a plurality of engine coolant temperature (ECT) measurements and a respective location associated with the received ECT measurement, and communicates the respective location and an instruction to direct engine coolant flow from the respective location to one of the heater and engine. The system also includes a coolant control module that selectively actuates one or more coolant control valves based on the respective location and the instruction.