Automatic Transmission Jump-State Control for Off-Road Gear Engagement
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Solution Overview
Problem
Dual-clutch transmissions (DCTs) have not been widely adopted in off-road vehicles due to high manufacturing costs and packaging issues, and existing control schemes are not well-suited for the unique operational conditions and safety considerations of off-road driving, which can lead to inadequate gear engagement during jumps and potential mechanical stress.
Innovation Solution
A method for controlling an automatic transmission in off-road vehicles that includes sensing vehicle speed and acceleration to determine jump states, preventing gear shifts during jumps, and transitioning to post-jump strategies based on wheel contact, as well as monitoring operational parameters to restrict or override transmission operation during faults, and using adaptive pressure-torque functions to optimize clutch control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dual-clutch transmission is used in off-road vehicles, then gear shifting performance and efficiency are improved, but manufacturing costs and packaging complexity increase
Solution Approach 1:
The control system dynamically adjusts transmission operation based on detected vehicle state (jump vs. non-jump). During jump conditions, the system prevents gear shifts to avoid mechanical stress, while allowing normal shifting operations during non-jump conditions, optimizing performance based on real-time conditions
2Ease of operation
If existing control schemes are used for transmission, then general automatic transmission operation is maintained, but gear engagement reliability deteriorates during jump conditions
Solution Approach 1:
The system uses feedback from acceleration sensors to detect jump conditions and adjusts transmission control accordingly. The controller continuously monitors vehicle acceleration and modifies gear shifting behavior based on the detected state, preventing shifts during jumps when reliability would deteriorate
Solution Approach 2:
The control system changes operational parameters (allowing or preventing gear shifts) based on the detected vehicle state. During jump conditions, the system changes the parameter of gear shift permission from allowed to prevented, maintaining reliability under varying conditions
3Adaptability or versatility
If gear shifts are allowed during jumps, then transmission adaptability is improved, but mechanical stress and potential damage increase
Solution Approach 1:
The system takes preliminary action by detecting jump conditions and preventing gear shifts before mechanical stress can occur. The control system proactively blocks shifting operations during detected jump conditions, preventing potential damage rather than reacting after stress occurs
Data Source
AI summary
A method for controlling an automatic transmission of a vehicle includes: sensing a speed of the vehicle; sensing an acceleration of the vehicle along three spatial axes; determining that the vehicle is in a jump state associated with the vehicle being off a ground surface, the jump state being defined at least in part by the acceleration of the vehicle along the three spatial axes and the speed of the vehicle; and controlling the transmission according to a jump strategy in response to determining that the vehicle is in the jump state. Other methods for controlling an automatic transmission of a vehicle are also contemplated.