Coolant Valve Cam Stuck Escape Control
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Solution Overview
Problem
Existing coolant control valve systems fail to prevent overheating and maintain cooling efficiency due to cam sticking issues, which can lead to degraded engine performance and user inconvenience.
Innovation Solution
A control system and method for the coolant control valve unit that employs a motor to rotate the cam, utilizing a rotation position detecting sensor and controller to determine stuck states, and applies specific torque modes such as oscillate, push, and ramp escape modes to quickly resolve cam sticking, ensuring stable coolant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cam enters a stuck state, then the valve cannot open/close the coolant passage, but implementing detection and escape operations increases system complexity
Solution Approach 1:
The control unit performs multiple functions using the same sensor and processing components: it controls normal coolant flow regulation, detects cam stuck states, and executes escape operations. This multi-functionality avoids adding separate dedicated systems for each function, thereby limiting the increase in overall system complexity while maintaining reliable coolant flow control.
Solution Approach 2:
The control unit uses its existing control capabilities to detect and resolve its own operational problems. When the cam becomes stuck, the control unit autonomously detects the condition and executes escape operations without requiring external intervention or additional specialized components, thereby maintaining system simplicity while ensuring reliable coolant flow control.
2Temperature
If the cam is stuck, then cooling efficiency deteriorates suddenly and coolant may overheat, but detecting and resolving the stuck state requires additional control operations
Solution Approach 1:
When a cam stuck state is detected, the control unit immediately executes escape operations without delay, rushing through the detection and resolution process to quickly restore proper coolant flow. This rapid response prevents the coolant temperature from rising to dangerous levels, maintaining effective temperature control despite the additional control operations required.
Solution Approach 2:
The control unit continuously monitors cam rotation status in advance, detecting stuck conditions before they lead to severe overheating. By performing preliminary detection and immediately initiating escape operations, the system prevents catastrophic cooling failure while managing control operation efficiency through proactive rather than reactive responses.
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 prevents coolant overheating and maintains cooling efficiency by quickly escaping the stuck cam state, thereby enhancing engine performance and user convenience by ensuring proper coolant temperature regulation.
Implementation Method 1
detecting, by a rotation position detecting sensor, a rotation position of the cam
Implementation Method 2
the motor outputs a predetermined torque to the cam side in a predetermined rotation direction to escape the cam from the stuck state
Data Source
AI summary
A control method of a coolant control valve unit that rotates a cam using torque of a motor and allowing a profile formed on the cam to push a rod to allow the valve formed on the rod to open/close a coolant passage, including steps of: rotating the cam by operating the motor; detecting a rotation position of the cam; determining a stuck state in which the cam or the motor is not rotated while the motor is operated; and performing an escape mode in which if it is determined that the cam or the motor is in the stuck state, the motor outputs a predetermined torque to the cam side in a predetermined rotation direction to escape the cam from the stuck state.