Transmission Control Apparatus for Rapid Gear Shifting
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Solution Overview
Problem
Conventional transmission control apparatuses face challenges in rapid gear shifting due to the need to return a sleeve to a neutral position when dog teeth engagement fails, leading to delays in completing the engagement process.
Innovation Solution
A control apparatus for a transmission that includes a processor to output gear engagement commands, control an actuator to move the sleeve from a neutral to a gear engaging position, and adjust the rotational position of dog teeth using an electric motor when engagement is prevented, allowing for direct phase shifting without returning to the neutral position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sleeve is returned to the neutral position to reattempt engagement when engagement fails, then the engagement can be retried, but the time required to complete engagement increases and shift operations cannot be performed rapidly
Solution Approach 1:
The invention changes the parameter of sleeve movement by rotating the rotating shaft to alter the relative rotational position between movable and passive dog teeth. Instead of returning the sleeve to neutral position, the system modifies the angular position parameter of the dog teeth through shaft rotation, enabling engagement retry while maintaining sleeve position and reducing time loss.
Solution Approach 2:
The invention introduces a rotational dimension to the engagement problem. Rather than resolving engagement failure by moving the sleeve axially (one dimension), the system rotates the shaft to change the angular position of dog teeth (adding a rotational dimension), thereby achieving engagement retry without axial sleeve movement and minimizing time loss.
2Reliability
If the sleeve is returned to the neutral position upon engagement failure, then the system can retry engagement, but the complexity of the engagement process increases
Solution Approach 1:
The invention extracts the engagement retry function from the sleeve movement sequence. Instead of integrating retry logic into the sleeve's axial movement (which would require neutral position return), the system separates the retry mechanism by using independent shaft rotation to adjust dog tooth positions, simplifying the overall engagement process while maintaining reliability.
Solution Approach 2:
The invention segments the engagement control into two independent functions: sleeve axial movement for engagement/disengagement and shaft rotation for phase adjustment. This segmentation allows retry of engagement by rotating the shaft without affecting the sleeve position, reducing process complexity while ensuring reliable engagement.
3Productivity
If the relative rotational position of dog teeth is adjusted by rotating the rotating shaft, then engagement can be achieved without returning to neutral position, but additional control of the electric motor is required
Solution Approach 1:
The invention makes the electric motor serve multiple functions: primary propulsion and secondary shaft rotation for dog tooth phase adjustment. By utilizing the existing motor's rotational capability for dual purposes, the system achieves faster shift operations without adding dedicated actuators, thereby improving productivity while minimizing control system complexity.
Solution Approach 2:
The invention merges the shaft rotation function into the existing electric motor control system. Instead of adding a separate control mechanism for phase adjustment, the motor's control is extended to simultaneously manage both propulsion and dog tooth positioning, consolidating control functions and avoiding additional complexity while enhancing shift speed.
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 faster and more efficient gear shifting by avoiding the delay of returning to the neutral position and allows for prompt resolution of engagement issues, enhancing the speed and reliability of gear changes.
Implementation Method 1
a rotating shaft rotatable by an electric motor
Data Source
AI summary
A control apparatus for a transmission including a gear engagement commander outputting a gear engagement command of a sleeve, an actuator controller controlling an actuator to move the sleeve from a neutral position to a gear engaging position when the gear engagement command is output, a gear engagement determiner determining whether an engagement of the sleeve is prevented in a course of moving the sleeve from the neutral position to the gear engaging position; and a motor controlling an electric motor to rotate a rotating shaft so as to change a rotational position of movable dog teeth relative to passive dog teeth when it is determined that the engagement of the sleeve is prevented.