Clutch Current Control Circuit for Variable Compressor Efficiency
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Solution Overview
Problem
Conventional systems lack a mechanism to effectively manage excess clutch current at minimum swash plate angles in variable compressors, leading to reduced efficiency and fuel efficiency in vehicles.
Innovation Solution
A clutch current control circuit that includes strain gauges and a switching element, varying resistance values based on the movement of the ECV shaft to control clutch current, allowing for optimized use of excess clutch current through different switching operation states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clutch current is unified based on maximum torque, then clutch suction force is sufficient for maximum torque operation, but excess clutch suction force is used at minimum swash plate angle reducing efficiency
Solution Approach 1:
The patent applies dynamics by making the clutch current variable rather than fixed. The clutch current is dynamically adjusted based on the swash plate angle position, using higher current at maximum torque for reliable engagement and lower current at minimum swash plate angle to eliminate excess suction force, thereby resolving the contradiction between reliability and energy loss
Solution Approach 2:
The patent changes the parameter of clutch current based on the swash plate angle. By detecting the swash plate angle position and相应ly adjusting the clutch current magnitude, the system optimizes the clutch suction force to match actual torque requirements, preventing energy waste while maintaining sufficient engagement force
2Loss of energy
If clutch current is reduced at minimum swash plate angle, then energy efficiency is improved, but clutch engagement reliability may be compromised
Solution Approach 1:
The patent changes the clutch current parameter based on swash plate angle detection. At minimum swash plate angle, the current is reduced to eliminate excess suction force and improve efficiency, while at maximum torque positions, sufficient current is maintained to ensure reliable engagement, thus resolving the contradiction between energy efficiency and engagement reliability
Solution Approach 2:
The patent uses feedback from swash plate angle detection to control clutch current. The control system continuously monitors the swash plate angle and adjusts the clutch current accordingly, ensuring that the current is optimized for each operating condition, thereby maintaining reliability while reducing energy waste
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
Improves the efficiency and fuel efficiency of vehicles by dynamically managing clutch current according to the movement of the ECV shaft, reducing excess clutch suction force and maintaining compatibility with existing systems without additional signal requirements.
Implementation Method 1
a strain gauge, wherein a resistance value of the strain gauge is varied according to the movement amount of an Electric Control Valve (ECV) shaft
Implementation Method 2
a switching element of performing a switching operation by comparing a gate-source voltage determined according to a change in the resistance value of the strain gauge and the threshold voltage
Data Source
AI summary
A clutch current control circuit may include as a circuit for controlling a current of a clutch connected to a compressor, a strain gauge, wherein a resistance value of the strain gauge is varied according to the movement amount of an Electric Control Valve (ECV) shaft; a switching element of performing a switching operation by comparing a gate-source voltage determined according to a change in the resistance value of the strain gauge and the threshold voltage, and allowing a flow of a first clutch current to generate by a first switching operation state; and a resistor connected in parallel with the switching element, and allowing a flow of a second clutch current to generate by a second switching operation state of the switching element.