Dog-Clutch Shifting Control to Avoid Tooth-on-Tooth Engagement
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Solution Overview
Problem
Existing circuit devices for motor vehicle transmissions face challenges in achieving efficient and comfortable switching operations, particularly in avoiding synchronization issues and tooth-up-to-tooth positions that lead to increased wear and noise.
Innovation Solution
The development of a circuit device with an unsynchronized claw switching mechanism, where the switching parts can be moved from a decoupling position to a coupling position without a tooth-up-to-tooth position, utilizing an electronic computing device to control the movement based on recorded rotary positions, thereby avoiding synchronization and reducing wear and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronization mechanisms are used to control the switching elements, then the switching operation becomes smoother and wear is reduced, but the device complexity increases due to additional sensors and control systems
Solution Approach 1:
The switching element performs its own synchronization by utilizing the rotational position information from its inherent rotation during gear shifting. The system uses the natural rotational movement of the switching element itself (rather than external synchronization mechanisms) to determine the correct engagement timing, allowing the component to self-regulate its switching operation based on its own motion state.
2Device complexity
If unsynchronized claw switching elements are used, then the device complexity is reduced, but tooth-up-to-tooth positions occur leading to increased wear and noise
Solution Approach 1:
The system implements feedback by using a sensor to detect the rotational position of the switching element and feeding this information back to the control unit. The control unit then uses this feedback to determine the precise moment when the switching element is in the correct rotational position to engage, enabling synchronized switching without requiring complex mechanical synchronization mechanisms.
3Object-affected harmful factors
If friction-based pre-synchronization is used, then tooth-on-tooth positioning is avoided, but the switching operation becomes less efficient and more complex
Solution Approach 1:
The invention replaces the traditional mechanical friction-based pre-synchronization system with an electronically controlled timing system. Instead of using friction to gradually synchronize the rotational speeds of meshing gears, the system uses electronic sensors and control units to precisely time the engagement of switching elements based on detected rotational positions, eliminating the need for friction-based mechanical synchronization.
Data Source
Figure 1
AI summary
The invention relates to a shifting device (10) for a transmission of a motor vehicle, comprising an unsynchronized dog-clutch shifting element (14) that comprises two shifting parts (16, 18), which can be rotated relative to each other about an axis of rotation (22) and which each have a set of shifting teeth (24, 30) and can be translated relative to each other along the axis of rotation (22) between at least one coupled position, in which the sets of shifting teeth (24, 30) mesh with each other, whereby the shifting parts (16, 18) are interconnected for conjoint rotation, and at least one uncoupled position, in which the sets of shifting teeth (24, 26) are uncoupled from each other, whereby the shifting parts (16, 18) can be rotated relative to each other about the axis of rotation (22). A sensing device (36) is provided, by means of which rotational positions that at least one of the shifting parts (16, 18) can be rotated into about the axis of rotation (22) relative to the other shifting part (16) can be sensed. An electronic computing device (38) is provided, which is designed to move the shifting parts (16, 18) from the uncoupled position into the coupled position in accordance with the sensed rotational positions.