Shift Lever Neutral Delay Control to Prevent Driving Force Drop
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Solution Overview
Problem
Existing vehicle control systems with momentary type shifting devices for automatic transmissions often unintentionally interrupt power transmission during propulsion when shifting through a neutral position, leading to temporary drops in driving force due to inappropriate determination periods for setting the neutral range.
Innovation Solution
A vehicle control system that includes a controller configured to establish and maintain the neutral range based on a threshold time and delay threshold time, ensuring the shift range is shifted appropriately between drive, deceleration, and neutral positions, preventing temporary drops in driving force by determining the execution of shifting operations to the neutral position and maintaining actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the determination time for setting the neutral range is shortened, then the responsiveness to driver input is improved, but the neutral range may be set unintentionally causing temporary drops in driving force
Solution Approach 1:
The system performs preliminary detection of the shift lever position and predicts the driver's intention before actually setting the neutral range. By anticipating the driver's intent based on the shift lever movement trajectory and timing, the system can prepare and execute the neutral range setting at the appropriate moment, ensuring both responsiveness and accuracy without unintentional settings.
2Ease of operation
If the shift lever passes through the neutral position during shifting between drive and deceleration positions, then the shifting operation is simplified, but the driving force drops temporarily due to unintended neutral range setting
Solution Approach 1:
The system continuously monitors the shift lever position, shifting speed, and current drive state to determine the driver's true intention. By providing feedback control that distinguishes between intentional neutral range selection and incidental passage through the neutral position, the system maintains power transmission during normal shifting operations while still allowing neutral range setting when genuinely intended.
3Loss of time
If the first period time and second period time are set to be short, then the time to set the neutral range is reduced, but the neutral range is set more than necessary interrupting power transmission
Solution Approach 1:
The system dynamically adjusts the determination criteria for setting the neutral range based on real-time driving conditions, shift lever movement characteristics, and predicted driver intent. Rather than using fixed time periods, the system adapts its decision-making process to distinguish between genuine neutral range requests and incidental lever movements, thereby reducing unnecessary power transmission interruptions while maintaining quick response when needed.
Data Source
AI summary
A control system for preventing a drop in driving force in a vehicle having a momentary type shifting device. In the shifting device, the N position corresponding to the N range and the default position are located between the D position corresponding to the D range and B position corresponding to the B range. The controller is configured to establish the neutral range in a case that the shift lever which is moved to the N position is maintained thereto for the threshold, and the neutral range maintaining action is executed after the lapse of the threshold time.