Electric Water Pump Cooling Control for Cylinder Head Temperature
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Solution Overview
Problem
During automatic stop conditions in vehicles, existing cooling systems often fail to sufficiently lower the cylinder head temperature within a short idle reduction period, leading to increased ignition timing retardation and reduced fuel economy upon restart.
Innovation Solution
A cooling device with multiple water circulation paths and an electric water pump that increases discharge flow rate during deceleration and maintains operation during automatic stop, switching between all-path flow and automatic stop modes to accelerate temperature decrease and improve fuel economy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electric water pump is maintained in an operating state during automatic stop, then the cylinder head temperature can be reduced, but the energy consumption increases
Solution Approach 1:
The cooling control starts before the automatic stop is activated (when vehicle speed becomes 0 km/h) and continues for a predetermined period after stop cancellation. This preliminary and extended cooling action ensures the cylinder head temperature is sufficiently reduced during the automatic stop period, allowing the pump to be turned off later to save energy while still achieving the temperature reduction goal.
2Temperature
If the cooling control period is extended beyond the automatic stop period, then the cylinder head temperature reduction is sufficient, but the control complexity increases
Solution Approach 1:
The cooling control duration is dynamically adjusted based on the automatic stop period. The control continues for a predetermined period (e.g., 10 seconds) after the automatic stop is canceled, rather than being fixed to exactly match the stop duration. This dynamic extension ensures sufficient cooling without requiring complex real-time adjustments, balancing temperature reduction effectiveness with control simplicity.
3Device complexity
If the cooling control is performed only during the automatic stop period, then the control simplicity is maintained, but the cylinder head temperature reduction is insufficient
Solution Approach 1:
The cooling control is initiated before the automatic stop is fully activated (when vehicle speed becomes 0 km/h) and extends for a predetermined period after stop cancellation. This timing strategy ensures the cooling process is well underway before the stop begins and continues sufficiently after to achieve adequate temperature reduction, all while maintaining relatively simple control logic based on straightforward timing conditions.
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 reduces cylinder head temperature during idle reduction, minimizing ignition timing retardation and enhancing fuel economy by maintaining the electric water pump in an operating state and optimizing cooling water circulation rates.
Implementation Method 1
an electric water pump for circulating cooling water through the cooling water circulation passage
Implementation Method 2
a first cooling water line which extends through a cylinder head of the internal combustion engine and through a radiator
Implementation Method 3
through a radiator, and in which water flows outside of a cylinder block
Data Source
AI summary
The present invention provides a cooling device for an internal combustion engine of a vehicle. While the vehicle is in a decelerating state and while the internal combustion engine is in an idle reduction state, the cooling device increases the ratio of the cooling water circulation rate through a first path which extends through a heater core and a radiator while reducing the ratio of the cooling water circulation rate through a second path which bypasses the heater core and radiator. In addition, the cooling device increases the discharge flow rate of the electric water pump while the vehicle is in a decelerating state, and maintains the electric water pump in an operating state during idle reduction. Thus, the present invention allows accelerating the temperature decrease of the cylinder head during idle reduction, as well as improving fuel economy during acceleration when the vehicle is started.