Reversible Radiator Fan Control for Charge Air Cooler De-Icing
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Solution Overview
Problem
Turbocharged engines face issues with ice formation in the Charge Air Cooler (CAC) due to condensate freezing, which can lead to engine misfires and hydrolock, and existing solutions like active grille shutters or permanent CAC blockers are insufficient during prolonged idling in cold conditions.
Innovation Solution
The method involves operating the radiator fan in a first direction to cool the engine and reversing its direction to blow heated air to the CAC, adjusting based on drive conditions, engine idle, and ambient temperatures to prevent ice formation, using control logic and air shrouds to direct airflow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the radiator fan operates in the first direction to cool the engine, then engine cooling is improved, but the CAC temperature decreases leading to ice formation
Solution Approach 1:
The radiator fan operates dynamically in two different directions based on real-time driving conditions. During normal operation, it cools the engine by drawing air through the radiator. During prolonged idle in cold conditions, it reverses direction to blow heated air onto the CAC, preventing ice formation. This dynamic switching resolves the contradiction between engine cooling and CAC temperature maintenance.
Solution Approach 2:
The system changes the operational parameter of the radiator fan (rotation direction) based on detected conditions. The control unit monitors engine idle status and ambient temperature, then switches the fan from forward rotation (engine cooling mode) to reverse rotation (CAC heating mode), thereby changing the thermal state of the CAC to prevent ice formation.
2Object-affected harmful factors
If specialized hardware like active grille shutters or permanent CAC blockers are used to increase ambient airflow temperature to the CAC, then ice formation is reduced, but device complexity increases
Solution Approach 1:
The radiator fan is made multi-functional by enabling it to operate in two directions. Its primary function is engine cooling during normal operation. Its secondary function, activated during prolonged idle in cold conditions, is to prevent CAC ice formation by reversing rotation. This eliminates the need for separate dedicated heating mechanisms or complex grille shutter systems.
Solution Approach 2:
The existing radiator fan system serves dual purposes: cooling the engine during normal operation and preventing ice formation in the CAC during prolonged idle. The system uses its own existing infrastructure (the fan motor and housing) to provide the heating function, eliminating the need for additional specialized hardware components.
3Object-affected harmful factors
If the radiator fan direction is reversed to blow heated air to the CAC, then ice formation is prevented, but engine cooling capability is reduced
Solution Approach 1:
The radiator fan operates periodically in reverse direction only during prolonged idle conditions, rather than continuously. The control unit detects when the engine has been idle for a threshold duration and activates reverse operation. Once the idle condition ends or ice prevention is achieved, the fan returns to normal forward rotation for engine cooling. This periodic switching ensures both functions are fulfilled at appropriate times.
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 reduces ice formation in the CAC, minimizing moisture and the likelihood of engine misfires and hydrolock, enhancing engine performance in cold conditions by maintaining the CAC temperature above freezing.
Implementation Method 1
reversing a direction of rotation of the radiator fan to blow heated air to a charge air cooler of the vehicle
Implementation Method 2
operating a radiator fan of the vehicle in a first direction to cool an engine of the vehicle
Data Source
AI summary
Methods and systems are provided for reducing ice formation in a charge air cooler. In one example, a method includes, operating a radiator fan of a vehicle in a first direction to cool an engine of the vehicle, and reversing a direction of rotation of the radiator fan to blow heated air towards a charge air cooler, the charge air cooler arranged proximate a radiator of the vehicle. Operating the radiator fan in a first direction may be based on the engagement of one or more gears of a transmission of the vehicle while operating the radiator fan in the reverse direction may be based on an engine temperature condition, one or more ambient weather conditions, and an engine idle condition.