Vehicle Heater Core Coolant Flow Control
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Solution Overview
Problem
Current engine cooling systems control coolant flow based on coolant temperature, leading to overcooling, which degrades fuel economy, engine performance, and increases emissions, while neglecting the ability to satisfy cabin heating demands by increasing airflow through the heater core.
Innovation Solution
A system that adjusts coolant flow to the heater core based on the error between target and measured cabin air temperatures, using a temperature error module and coolant flow control module to minimize coolant flow while maximizing airflow, thereby optimizing coolant flow and maintaining cabin comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If coolant flow is increased to satisfy cabin heating demands, then cabin heating performance is improved, but fuel economy deteriorates and emissions increase
Solution Approach 1:
The system continuously monitors duct air temperature and compares it to a target temperature, then adjusts coolant flow rate accordingly. The feedback control loop modifies coolant pump output or control valve position based on the temperature error signal, ensuring optimal coolant flow that satisfies heating demands without excessive fuel consumption.
Solution Approach 2:
The system dynamically adjusts coolant flow rate in real-time based on actual heating demands and temperature conditions. Rather than maintaining a fixed coolant flow rate, the system adapts the flow rate to match the actual temperature error and heater flap position, optimizing the balance between cabin heating performance and fuel economy.
2Loss of energy
If coolant flow rate is reduced to improve fuel economy, then fuel economy is improved, but cabin heating performance deteriorates
Solution Approach 1:
The feedback control mechanism ensures that coolant flow rate is reduced only when the temperature error is within acceptable limits. When cabin heating demands increase (indicated by larger temperature errors), the system automatically increases coolant flow to maintain heating performance, preventing deterioration of cabin comfort while optimizing fuel economy during milder conditions.
Solution Approach 2:
The system changes the coolant flow rate parameter dynamically based on operating conditions. By adjusting the coolant flow rate in response to temperature errors and heater flap positions, the system finds the optimal parameter setting that balances fuel economy improvement with adequate cabin heating performance.
3Loss of energy
If coolant flow is optimized based on temperature error, then fuel economy is improved, but system complexity increases
Solution Approach 1:
The coolant control system serves multiple functions: it maintains cabin heating performance, optimizes fuel economy, and adapts to varying operating conditions. By integrating temperature error monitoring, heater flap position sensing, and dynamic coolant flow adjustment into a single control module, the system achieves multiple objectives without proportionally increasing 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
This approach minimizes coolant flow through the heater core, preventing overcooling, improving fuel economy, enhancing engine performance, and reducing emissions while maintaining cabin comfort.
Implementation Method 1
Heat is transferred from coolant circulating through the heater core to air passing through the heater core before the air enters the passenger cabin
Data Source
AI summary
A system includes a temperature error module and a coolant flow control module. The temperature error module determines an error between a target air temperature and a measured air temperature of a duct that supplies air to a cabin of a vehicle. The coolant flow control module controls a rate at which coolant flows to a heater core of the vehicle by adjusting at least one of a position of a coolant control valve of the vehicle and an output of an electric coolant pump of the vehicle. The coolant flow control module also controls the coolant flow rate to decrease the error between the target air temperature and the measured air temperature.