Dog Clutch Control via Deceleration Gradient Thrust Adjustment
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Solution Overview
Problem
Existing dog clutch control systems for automated transmissions face issues with proper engagement between the sleeve and idler gear, leading to inefficient shifting operations due to improper torque application and reliance on timers, which can result in prolonged shifting times.
Innovation Solution
A dog clutch control apparatus featuring a rotary shaft, a clutch ring, a sleeve with high and low teeth, and a control unit that adjusts the thrust load based on the deceleration gradient of rotation speeds detected by sensors, ensuring optimal engagement by reducing thrust load when the deceleration gradient is below a certain value to facilitate quicker and more accurate shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sleeve is pushed against the idler gear with large torque to ensure proper engagement, then engagement reliability is improved, but shifting time increases
Solution Approach 1:
The patent applies dynamic control by adjusting the thrust load based on real-time detection of rotation speed differences between the sleeve and clutch ring. The control unit dynamically modifies the engagement force rather than using fixed large torque, allowing optimal engagement while reducing unnecessary shifting time.
Solution Approach 2:
The patent implements feedback control through a rotation speed detection sensor that continuously monitors the rotation speeds of the sleeve and clutch ring. This feedback information is used by the control unit to adjust the thrust load, creating a closed-loop system that ensures reliable engagement while minimizing shifting time.
2Measurement precision
If a timer-based reentry control is used to determine engagement failure, then engagement accuracy is improved, but shifting time increases
Solution Approach 1:
The patent replaces the mechanical timer-based detection system with a rotation speed detection sensor that directly measures the actual engagement state. This substitution eliminates the delay inherent in timer-based methods while maintaining accurate detection of engagement success or failure.
Solution Approach 2:
The rotation speed detection sensor provides real-time information about the engagement state, allowing the system to self-determine whether engagement has succeeded without relying on predetermined time intervals. The system serves itself by using its own operational parameters (rotation speeds) to assess engagement status.
3Stability of the object's composition
If the sleeve and idler gear co-rotate with each other before engagement, then engagement stability is improved, but shifting time increases
Solution Approach 1:
The patent applies dynamic control by adjusting the thrust load based on real-time detection of rotation speed differences between the sleeve and clutch ring. The control unit dynamically modifies the engagement force rather than using fixed large torque, allowing optimal engagement while reducing unnecessary shifting time.
Solution Approach 2:
The patent changes the thrust load parameter dynamically based on detected rotation speed differences. By adjusting this critical parameter in real-time, the system achieves stable engagement while minimizing the time required for the sleeve and clutch ring to synchronize their rotation speeds.
Data Source
AI summary
A dog clutch control apparatus for an automated transmission includes a rotary shaft, a dog clutch transmission mechanism including a clutch ring, a clutch hub, a sleeve including a spline, an axial driving device, a dog clutch portion provided at the clutch ring, a rotation speed detection sensor, the spline including high teeth and a low tooth, clutch rear teeth and clutch front teeth formed at the dog clutch portion, and a control unit controlling an operation of the axial driving device based on a deceleration gradient of a rotation speed of either one of the sleeve and the clutch ring detected by the rotation speed detection sensor and controlling the axial driving device so that a decreased thrust load is applied to the clutch rear teeth from the sleeve in a case where the deceleration gradient is smaller than a first predetermined value.