Vehicle Coolant Circuit Control for Pipe Heat Loss Compensation
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Solution Overview
Problem
In vehicle air conditioning systems, the complexity of coolant passages leads to increased pipe heat loss, resulting in decreased coolant temperature, which can insufficient heating or warming capacities for vehicle cabins and batteries.
Innovation Solution
A control device and method that calculate a target coolant temperature and adjust it to account for pipe heat loss, using a processor to control heat sources in the vehicle coolant circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the coolant passage is complicated to include multiple heat sources, then the heating and warming functions are improved, but the pipe heat loss increases and coolant temperature decreases
Solution Approach 1:
The control device calculates and applies a correction value to the target coolant temperature in advance, considering the expected heat loss in the coolant passage. This preliminary adjustment ensures that the coolant reaches the required temperature at the heat using portion despite the heat loss during circulation.
Solution Approach 2:
The system dynamically adjusts the target coolant temperature parameter based on operating conditions such as coolant flow rate and outside air temperature. By changing this parameter, the system compensates for variable heat loss conditions while maintaining effective heating and warming functions.
2Power
If the coolant passage is complicated to include multiple heat sources, then the heating capacity is improved, but the coolant temperature decreases due to pipe heat loss
Solution Approach 1:
The control device performs preliminary calculation of the correction value based on the coolant flow rate and outside air temperature before controlling the heat sources. This advance preparation allows the system to maintain adequate coolant temperature at the heat using portion despite the complicated passage configuration.
Solution Approach 2:
The system continuously monitors operating conditions and adjusts the target coolant temperature accordingly. The correction value is recalculated based on real-time parameters such as coolant flow rate and outside air temperature, ensuring the heating capacity is maintained while compensating for temperature drops.
3Power
If the coolant passage is complicated to include multiple heat sources, then the warming capacity is improved, but the coolant temperature decreases due to pipe heat loss
Solution Approach 1:
The control device calculates the correction value in advance considering the warming requirements and expected heat loss. This preliminary adjustment ensures that the coolant maintains sufficient temperature for battery warming or other thermal management functions despite the complicated passage configuration.
Solution Approach 2:
The target coolant temperature parameter is dynamically adjusted based on the warming requirements and operating conditions. By changing this parameter with a calculated correction value, the system ensures adequate warming capacity is delivered to the heat using portion.
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 solution effectively suppresses the decrease in coolant temperature due to pipe heat loss, ensuring adequate heating and warming capacities for vehicle cabins and batteries.
Implementation Method 1
a water pump configured to circulate a coolant
Implementation Method 2
a plurality of heat sources configured to heat the coolant
Implementation Method 3
a heat using portion configured to use heat of the coolant
Implementation Method 4
a coolant passage configured to connect the water pump, the heat sources, and the heat using portion
Data Source
AI summary
A control device configured to control a vehicle coolant circuit includes a processor. The processor is configured to calculate a target coolant temperature, and control heat sources based on the target coolant temperature. The processor is configured to correct the target coolant temperature in consideration of a loss of heat of a coolant in a coolant passage.