Motorcycle Dog Clutch Transmission Control for Responsive Shifting
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Solution Overview
Problem
Motor vehicles with dog clutch transmissions actuated by motors experience unresponsive shifting when riders input additional shift commands during ongoing shift operations, leading to uncomfortable riding experiences.
Innovation Solution
A control system that determines the timing of shift commands and adjusts clutch and gear actuation schedules to allow for responsive shifting by interrupting or modifying clutch engagement operations based on the timing of additional shift commands, using a shift command receiving unit, a shift control unit, and a shift command timing determining unit to manage dog insert and disengagement operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clutch engagement operation is completed according to the original schedule during a shift operation, then the shift operation can be finished smoothly, but additional shift commands input by the rider cannot be responded to timely
Solution Approach 1:
The clutch engagement control is made dynamic by allowing the engagement schedule to be modified based on timing of additional shift commands. The control device determines whether to interrupt the clutch engagement operation based on the timing of the additional shift command, enabling the system to adapt between smooth completion and responsive interruption according to rider input timing
2Ease of operation
If the clutch engagement operation is interrupted to respond to additional shift commands, then the responsiveness to rider input is improved, but the shift operation may be delayed or incomplete
Solution Approach 1:
The control device performs preliminary determination of whether to interrupt the clutch engagement operation based on the timing of the additional shift command. By evaluating the timing condition before executing the interruption, the system prepares the appropriate response that balances responsiveness with operational completeness, minimizing unnecessary delays
Data Source
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AI summary
In a motor vehicle having a clutch 42 and a dog clutch transmission 50 actuated by actuators such as motors 51, 52, an additional shift command is accepted during a shift operation, thereby providing control that makes possible a responsive shift operation. When a shift command is issued at a timing at which a shift operation is not being conducted, a disengagement operation of the clutch 42 and a dog insert operation of the transmission 50 are conducted in accordance with a first schedule, and then a first shift operation including an engagement operation of the clutch 42 is conducted. When a shift command is issued during a shift operation and an engagement operation of the clutch 42, the disengagement operation of the clutch 42 and the dog insert operation of the transmission are conducted according to a second schedule that is different from the first schedule so that the dog insert operation of the transmission 50 is conducted during the disengagement operation of the clutch 42, and then a second shift operation including the engagement operation is conducted.