Selectable One-Way Clutch Control System for Disengagement Delay
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Solution Overview
Problem
The existing selectable one-way clutch (SOWC) systems experience delays in disengagement due to frictional forces between the strut and pocket, making it difficult to accurately detect the disengagement state, which can lead to excessive load or shock in gear systems.
Innovation Solution
A control system that includes a motor and an electronic control unit to actively manage the engagement mechanism by generating relative rotation in the opposite direction, allowing for precise control of the disengagement state, using an actuator and sensor to detect the operation amount and maintain a predetermined rotational speed difference between the first and second members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the SOWC uses a friction-based engagement mechanism with a spring and selector plate, then the structure is simple and passive, but the disengagement is delayed and cannot be accurately controlled
Solution Approach 1:
The patent replaces the passive mechanical spring-based system with an active motor-driven system. The motor (22) applies controlled torque to the second member (25) to generate relative rotation, substituting the elastic force mechanism with an electromechanical control system that can precisely regulate disengagement timing and speed difference.
Solution Approach 2:
The patent introduces a sensor (33) that detects the operation amount of the actuator and provides feedback to the electronic control unit. This feedback mechanism enables the system to accurately detect when disengagement occurs and adjust the motor torque accordingly, eliminating the delay and uncertainty inherent in passive mechanical systems.
2Reliability
If the SOWC relies on frictional force to maintain engagement, then the engagement is passive and self-sustaining, but the disengagement timing cannot be accurately detected
Solution Approach 1:
The sensor (33) detects the actuator operation amount and provides real-time feedback to the electronic control unit. This enables precise detection of disengagement timing by monitoring the actual position and movement of the engagement mechanism components, transforming the passive friction-based system into an actively monitored controlled system.
Solution Approach 2:
The patent replaces the friction-based passive engagement maintenance with an active motor control system that applies torque to the second member. This substitution enables precise control and detection of engagement state transitions, allowing the system to accurately determine when disengagement occurs through sensor feedback on motor and actuator operation.
3Extent of automation
If the SOWC uses a passive spring-based selector plate mechanism, then the system requires no active control, but excessive load or shock may occur in gear systems
Solution Approach 1:
The patent replaces the passive spring-based mechanism with an active motor-driven system that applies controlled torque to the second member (25). This substitution enables precise control of the relative rotation speed between members, allowing the system to smoothly manage engagement and disengagement transitions, thereby preventing excessive loads or shocks in the gear system.
Solution Approach 2:
The patent introduces dynamic control by using a motor to actively adjust the torque applied to the second member based on real-time sensor feedback. This dynamic adjustment capability allows the system to optimize the speed difference between members during transitions, preventing harmful loads and shocks that occur with static spring-based mechanisms.
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
This approach enables rapid and reliable switching of the engagement mechanism to the disengaged state, avoiding delays and ensuring accurate detection of disengagement, thus preventing excessive load or shock in the gear system.
Implementation Method 1
a motor (22) configured to rotate one of the first and second members
Implementation Method 2
The frictional force acts between the strut and the pocket in a state that the strut is engaged with the pocket, and thus movement of the strut is restricted
Data Source
AI summary
A selectable one-way clutch includes an engagement mechanism. The engagement mechanism is configured to be switched between an engaged state and a disengaged state. The engaged state is a state in which relative rotation between a first and a second members in one of a positive rotational direction and a reverse rotational direction is restricted. The disengaged state is a state in which the relative rotation between the first member and the second member in both of the positive and the reverse rotational direction is permitted. The electronic control unit is configured to apply torque to the one of the first member or the second member by using a motor such that relative rotation in the other one of the positive or the reverse rotational direction is generated between the first member and the second member when the engagement mechanism is switched from the engaged state to the disengaged state.