Transmission Control Device for Rapid Forward Reverse Switching
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Solution Overview
Problem
The existing control methods for automatic transmissions with frictional engagement elements face challenges in quickly switching between forward and reverse control due to the clearance between driving-side and driven-side connectors, leading to potential sluggishness in gear switching, especially in vehicles equipped with parking assistance systems that frequently switch between forward and reverse control.
Innovation Solution
A transmission control device that includes forward and reverse power transmission mechanisms with driving-side and driven-side connectors, capable of transitioning between contact, intermediate, and retracted states, allowing for controlled switching between forward and reverse control by managing the contact state of one mechanism while maintaining an intermediate state in the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both forward and reverse power transmission mechanisms are controlled to the contact state during switching, then torque transmission is ensured, but switching time increases due to clearance elimination requirements
Solution Approach 1:
The system performs preliminary action by controlling one power transmission mechanism to the intermediate state in advance before switching is needed. This allows the mechanism to be pre-positioned closer to the contact state, reducing the time required to eliminate clearance and transmit torque when switching occurs.
Solution Approach 2:
The system dynamically adjusts the control state of power transmission mechanisms based on operational requirements. By introducing an intermediate state between retracted and contact states, the system can flexibly transition mechanisms closer to contact without fully engaging, optimizing the balance between torque transmission readiness and switching speed.
2Ease of manufacture
If the clutch is designed with predetermined clearance between connectors, then mechanical tolerance and ease of assembly are improved, but starting response and switching responsiveness deteriorate due to dead zone
Solution Approach 1:
The control system performs preliminary action by advancing one mechanism to the intermediate state before switching occurs. This pre-positioning reduces the effective dead zone distance that must be traversed during switching, improving response speed while maintaining the mechanical clearance design for ease of assembly.
Solution Approach 2:
The intermediate state acts as an intermediary condition between fully retracted and fully contacted states. By utilizing this intermediate position, the system can bridge the clearance gap more efficiently during switching, improving responsiveness without changing the mechanical clearance dimensions that facilitate assembly.
Data Source
AI summary
The present invention proposes a transmission control device capable of shortening a switching time between forward control and reverse control of a transmission. The present invention relates to a transmission control device that controls a transmission, including: a forward power transmission mechanism configured to move a vehicle forward; and a reverse power transmission mechanism configured to reverse the vehicle. Each of the forward power transmission mechanism and the reverse power transmission mechanism includes a driving-side connector and a driven-side connector. The forward power transmission mechanism and the reverse power transmission mechanism are configured to be capable of changing a contact state where the driving-side connector and the driven-side connector are pushed to contact each other, a retracted state where pushing forces are released to retract the driving-side connector and the driven-side connector, and an intermediate state formed as the intermediate state between the contact state and the retracted state. When the vehicle is controlled based on a previously-generated control content including switching between forward control and reverse control, one of the forward control and the reverse control is performed by controlling one power transmission mechanism between the forward power transmission mechanism and the reverse power transmission mechanism to the contact state while controlling the other power transmission mechanism to the intermediate state.