Motor Vehicle Radiator Louver Control System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing louver control systems for motor vehicle radiators, particularly those using vacuum units or servo motors, face challenges such as space inefficiency, reliance on engine operation for control, and limited control force, making them unsuitable for adaptive and reliable operation with differently sized louvers and radiator frames.
Innovation Solution
A self-locking gear motor with a stepper motor and a crank mechanism, coupled with a positioning rod and linkage, provides high control forces and adaptability, replacing traditional vacuum control units without design changes, and allows for reliable operation independent of engine status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vacuum unit is used for servo drive, then the louver can be controlled, but the installation space required increases and the control force becomes dependent on diameter size
Solution Approach 1:
The patent replaces the vacuum unit (pneumatic system) with an electric servo motor, transforming the control mechanism from pneumatic to electric. This substitution eliminates the need for vacuum lines and vacuum sources, significantly reducing installation space while providing consistent control force independent of diameter size.
Solution Approach 2:
The invention changes the control parameter from vacuum pressure (pneumatic) to electrical signals (electric), allowing for more precise and adaptable control. The servo motor can be programmed to provide optimal control force regardless of the louver's diameter, resolving the limitation of vacuum units where control force depends on diameter size.
2Reliability
If a vacuum unit is used for servo drive, then the louver control is achieved, but the system complexity increases due to vacuum source and vacuum lines
Solution Approach 1:
The patent replaces the complex pneumatic system (vacuum source, vacuum lines, vacuum unit) with a compact electric servo motor. This substitution dramatically reduces system complexity by eliminating multiple components and connections, while maintaining or improving control reliability through electronic control systems.
3Temperature
If the louver is closed for storing heat when the internal combustion engine is shut off intentionally, then heat retention is improved, but the control capability is lost because vacuum cannot be maintained without engine running
Solution Approach 1:
The patent replaces the engine-dependent vacuum system with an electric servo motor that operates independently of engine status. This allows the louver to be controlled programmatically regardless of whether the engine is running or shut off, enabling heat retention functionality to work reliably in all operating conditions.
Solution Approach 2:
The servo motor can be programmed to close the louver in advance before the engine is shut off, ensuring heat retention is activated proactively. This preliminary action capability allows the system to prepare for heat retention mode regardless of engine status, improving adaptability and control versatility.
4Device complexity
If a short angle lever arm of a servo motor is used to control the set ring, then the control force is reduced, but the device complexity increases due to sliding mounting and thermostat coupling
Solution Approach 1:
The patent employs a dynamic linkage mechanism that adapts its geometry during operation. The linkage can change its effective lever arm length depending on the position, providing high mechanical advantage (control force) when needed while maintaining compact dimensions. This dynamic adjustment resolves the trade-off between control force and device complexity.
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 enables a compact, high-force, and reliable louver control system that can operate independently of engine status, adapt to various louver sizes, and maintain precise temperature control without the need for additional sensors or complex positioning stops.
Implementation Method 1
a self-locking gear motor with an output shaft that is coupled with a crank
Implementation Method 2
these two links 12 and 14 are designed as ball joints so that the motion of the positioning rod occurring in two planes perpendicular to each other
Data Source
AI summary
A servo drive for the set ring of a louver for a motor vehicle has a self-locking gear motor, the output shaft of which is coupled with a control crank. The end of the control crank turned away from the output shaft is connected by way of a link in a toggle-like manner with a positioning rod that is longer by a multiple of its length, of which the end turned away from the control crank is coupled with the set ring. A housing that protects the crank drive extends along the circumference of the set ring and is fastened on the radiator frame together with a servo drive housing.