EV Gear Selection Control With Constant-Gear Hold
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Solution Overview
Problem
Existing automatic gear selection systems in electric vehicles, particularly heavy-duty vehicles, cause unwanted gear changes and driver discomfort, especially during direction changes and inclinations, leading to reduced drivability and safety.
Innovation Solution
A control system with a user input element that allows operators to selectively hold a constant gear, overriding automatic gear shifts, and a method that inhibits unwanted gear ratio changes based on vehicle inclination, mass, and power limits, ensuring improved operator control and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automatic gear selection is used, then gear control is automated and driver workload is reduced, but unwanted gear changes occur during direction changes and inclinations causing driver discomfort
Solution Approach 1:
The system dynamically adjusts gear selection behavior based on detected driving conditions. When direction changes or inclinations are detected, the system automatically holds the current gear ratio to prevent unwanted gear shifts, while allowing automatic gear selection to operate normally under other conditions. This dynamic adaptation resolves the contradiction by making the automation context-aware.
Solution Approach 2:
The system uses feedback from sensors detecting vehicle direction changes and longitudinal inclinations to modify gear selection behavior. When feedback indicates a direction change or inclination exceeding a threshold, the system responds by holding the current gear, thereby preventing driver discomfort while maintaining automated control during normal operation.
2Adaptability or versatility
If automatic gear ratio shifts are performed during direction changes, then gear control adapts to loading conditions, but power cut-offs occur reducing vehicle performance
Solution Approach 1:
The system takes preliminary action by detecting direction changes and inclinations before unwanted gear shifts occur. By preemptively holding the current gear ratio when such conditions are detected, the system prevents power cut-offs and maintains vehicle performance, while still allowing adaptive gear selection during normal driving conditions.
3Power
If gear shifts are performed during longitudinal inclination, then power transmission is optimized, but driver discomfort increases due to unwanted gear changes
Solution Approach 1:
The system continuously monitors longitudinal inclination through sensor feedback. When the inclination exceeds a predetermined threshold or during direction changes, the system responds by holding the current gear ratio to prevent driver discomfort, while allowing power-optimized gear shifts during normal driving conditions based on feedback from acceleration and load sensors.
Data Source
AI summary
The present disclosure relates to a control system for gear selection of a transmission for an electrically driven vehicle, wherein said control system comprises a gear selection control device and a gear selection input device, the gear selection input device comprising a user input element for selectively holding a constant gear, and wherein said control system is adapted to hold a constant gear of the transmission while the user input element is activated. The disclosure also relates to a transmission arrangement, a powertrain, a vehicle and a method.