Coolant Valve Control Reducing Heat Shock via Dynamic Hysteresis
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Solution Overview
Problem
Conventional coolant control valve units experience durability issues due to frequent opening and closing operations, especially in low outside temperatures, leading to heat shock and degradation of radiator and cooling components.
Innovation Solution
A control method for the coolant control valve unit that dynamically adjusts the hysteresis value and opening duration based on outside temperature, coolant temperature, and drive conditions to reduce the frequency of valve operations and prevent excessive cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed hysteresis value is used for valve control, then the control logic is simple, but the valve opens and closes frequently in low outside temperatures causing heat shock and durability degradation
Solution Approach 1:
The hysteresis value is changed from a fixed parameter to a dynamic parameter that varies with outside temperature. The control unit adjusts the hysteresis value based on detected outside temperature, making the control system adaptive to environmental conditions and reducing unnecessary valve operations in cold weather.
Solution Approach 2:
The hysteresis parameter is modified according to outside temperature conditions. When outside temperature is low, the hysteresis value is increased to prevent frequent valve cycling. This parameter adjustment directly addresses the durability issue while maintaining control effectiveness.
2Temperature
If the valve opens frequently to maintain coolant temperature, then coolant temperature control is improved, but the valve and cooling components suffer from heat shock and durability degradation
Solution Approach 1:
The control system dynamically adjusts the hysteresis parameter based on outside temperature to balance coolant temperature control and valve durability. This dynamic adjustment reduces the frequency of valve operations while maintaining adequate temperature control.
Solution Approach 2:
By changing the hysteresis parameter value according to outside temperature conditions, the system optimizes the trade-off between temperature control precision and component durability, particularly protecting against heat shock in low-temperature environments.
3Reliability
If hysteresis is applied to prevent frequent valve operations, then valve durability is improved, but coolant temperature control precision deteriorates
Solution Approach 1:
The hysteresis value is dynamically adjusted based on outside temperature rather than being fixed. This allows the system to maintain higher precision when needed (higher temperatures) while reducing unnecessary operations when outside temperature is low, thus balancing precision and durability.
Solution Approach 2:
The hysteresis parameter is optimized based on environmental conditions. By increasing hysteresis in cold weather and maintaining lower hysteresis in warmer conditions, the system adapts to preserve both temperature control precision and valve durability across different operating environments.
Data Source
AI summary
A control method for a coolant control valve unit includes detecting the coolant temperature; opening a radiator coolant supply valve; controlling the opening rate of the valve if the detected coolant temperature is higher than a target coolant temperature; and calculating a first difference value by subtracting a hysteresis value from the target coolant temperature. The blocking or controlling of the opening rate is conducted according to the detected coolant temperature and the first difference value. The hysteresis value is variable according to outside temperature.