Vehicle Control System Shift Mode Selection
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Solution Overview
Problem
Existing vehicle control systems face difficulties in smoothly changing gear positions during shift-up and shift-down operations, especially during acceleration and deceleration, without requiring clutch operation, leading to reduced operability.
Innovation Solution
A control system that selects between two shift modes based on the type of shift operation and the vehicle's traveling state, using a clutch actuator to either disengage and re-engage the clutch or adjust engine output while keeping the clutch engaged, allowing for smooth gear changes without manual clutch operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clutch is disengaged during gear shift operation, then the gear position can be changed smoothly, but the operability is reduced and manual clutch operation is required
Solution Approach 1:
The control part automatically determines the appropriate shift mode (first shift mode with clutch disengagement or second shift mode with engine output adjustment) based on vehicle traveling state, eliminating the need for manual clutch operation by the driver. The system serves itself by autonomously selecting the optimal gear shift strategy.
Solution Approach 2:
The system dynamically switches between two different shift modes depending on the vehicle's traveling state. The control part adjusts the gear shift strategy in real-time, selecting clutch disengagement mode or engine output adjustment mode based on current operating conditions, making the system adaptable and easy to operate.
2Ease of operation
If engine output is adjusted while clutch is engaged, then no-clutch operation is achieved, but smooth gear position change is difficult during acceleration and deceleration
Solution Approach 1:
The control part changes the operating parameters by selecting different shift modes based on vehicle traveling state. When engine output adjustment is used (second shift mode), the system modifies engine output parameters to enable smooth gear changes. When clutch disengagement is used (first shift mode), it changes the clutch engagement parameter to ensure smooth gear position transition.
Solution Approach 2:
The control part acts as an intermediary that mediates between the driver's gear shift request and the actual gear change execution. It selects the appropriate shift mode and coordinates the clutch actuator and engine output adjustment to achieve smooth gear position changes without requiring manual clutch operation.
3Ease of manufacture
If clutch is switched to disengaged state before gear position change, then gear separation is facilitated, but operability is reduced due to manual clutch operation
Solution Approach 1:
The control part automatically manages the clutch disengagement and reengagement process based on the detected gear shift request and vehicle traveling state. The driver simply requests the gear shift, and the system self-manages the clutch operation to facilitate gear separation and engagement.
Solution Approach 2:
The control part performs preliminary clutch disengagement before the gear position change is executed, and subsequently reengages the clutch after the gear change. This preliminary action facilitates smooth gear separation without requiring the driver to manually operate the clutch.
4Reliability
If multiple shift modes are provided based on traveling state, then smooth gear position change is achieved in various driving conditions, but control system complexity increases
Solution Approach 1:
The control part dynamically selects between first shift mode and second shift mode based on the vehicle's traveling state detected in real-time. This dynamic adaptation ensures smooth gear position changes across various driving conditions (acceleration, deceleration, constant speed) without requiring complex mechanical hardware changes.
Solution Approach 2:
The control part serves multiple functions: detecting vehicle traveling state, determining appropriate shift mode, controlling clutch actuator, and adjusting engine output. This multi-functional control system achieves smooth gear changes in various conditions while using a single integrated control unit rather than separate dedicated systems.
Data Source
AI summary
A control part controls a clutch actuator. The control part has a first shift mode and a second shift mode. In the first shift mode, the clutch is switched to the disengaged state before changing of the gear position and the clutch is switched to the engaged state after changing of the gear position. In the second shift mode, an output of the prime mover is adjusted while the clutch is kept in the engaged state during the shift operation. Either the first shift mode or the second shift mode is selected on the basis of a detection result on whether the shift operation is a shift-up operation or a shift-down operation, and a traveling state of the vehicle.