Traction Transmission Capacity Control Device Reference Point Setting
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Solution Overview
Problem
Existing traction transmission capacity control devices face challenges in precisely setting the reference point for traction transmission capacity control due to manufacturing dimension errors and variations, leading to inconsistent performance.
Innovation Solution
Incorporating revolution torque detecting, revolution speed detecting, singular-point detecting, and second-roller revolution operation reference point setting means to establish a precise reference point for traction transmission capacity control, ensuring accurate control regardless of manufacturing errors or variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reference point for traction transmission capacity control is defined based on actuator rotational angle, then the control relationship between actuating amount and output torque can be established, but the reference point becomes changeable due to manufacturing dimension errors and variations
Solution Approach 1:
The system uses its own operational characteristics (revolution torque and revolution speed) to automatically determine the reference point, eliminating the need for external calibration or pre-defined reference points that are susceptible to manufacturing variations. The singular point detection method allows the system to self-calibrate based on its actual operational state.
Solution Approach 2:
The system detects revolution torque and revolution speed, monitors their time-series changes, and uses the detected singular points as feedback to establish the reference point. This closed-loop approach ensures the reference point accurately reflects the actual mechanical state, compensating for manufacturing errors.
2Ease of operation
If the reference point is clearly defined in advance, then the relationship between control output actuating amount and control output torque can be understood, but manufacturing dimension errors cause the reference point to shift
Solution Approach 1:
The patent replaces mechanical reference point definition (based on physical dimensions and assembly) with a detection-based approach using torque and speed sensors. This substitution of mechanical positioning with sensor-based detection eliminates sensitivity to manufacturing dimensional errors.
3Productivity
If traction transmission capacity control is performed without precise reference point detection, then the system can operate, but the control accuracy deteriorates due to undefined reference point
Solution Approach 1:
The system performs preliminary detection of revolution torque and revolution speed to identify singular points before establishing the reference point for control operations. This preliminary action ensures the reference point is accurately established before actual traction transmission capacity control begins.
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 precise setting of the second-roller revolution operation reference point, allowing for consistent and intended traction transmission capacity control, even with manufacturing variations or changes in operation characteristics or temperature.
Implementation Method 1
revolution torque detecting means for causing the second roller to revolve around a rotational axis of the second roller and detecting revolution torque of the second roller during the revolution of the second roller
Implementation Method 2
revolution speed detecting means for causing the second roller to revolve around a rotational axis of the second roller and detecting revolution speed of the second roller during the revolution of the second roller
Implementation Method 3
singular-point detecting means for detecting singular points concerning time-series changes of the revolution torque and the revolution speed
Implementation Method 4
second-roller revolving means for revolving the second roller around a rotational axis of a crankshaft, and by performing a rotation operation of the crankshaft, a radial-direction mutual pressing force between the first roller and the second roller is increased and decreased
Implementation Method 5
power transmission (traction transmission) is performed due to frictional contact between these rollers
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A crankshaft is normally and reversely rotated at a constant speed, during which the singular points ((a), (b), (c), (d)) of crankshaft driving motor current (i) responding to the drive torque change of the crankshaft are detected. A crankshaft rotational angle reference point is set based on the midpoint between the crankshaft rotational positions obtained when, among these singular points ((a), (b), (c), (d)), singular points having the same type (same symbol) appear during the respective normal and reverse rotations. Therefore, the crankshaft rotational angle reference point can be reliably set regardless of the variations and errors.