Automatic Transmission Jump-State Shift Control for Off-Road Vehicles
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Solution Overview
Problem
Off-road vehicles require specialized control schemes for automatic transmissions, particularly dual-clutch transmissions (DCTs), to manage unique driving conditions such as jumps and varying terrain, which existing control systems are not well adapted to handle.
Innovation Solution
A method for controlling an automatic transmission of a vehicle that involves sensing vehicle speed and acceleration along three spatial axes to determine if the vehicle is in a jump state, and then applying a jump strategy to prevent gear shifting during the jump, followed by a post-jump strategy once the vehicle has landed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dual-clutch transmission is used in an off-road vehicle, then shifting performance and efficiency are improved, but manufacturing costs and packaging complexity increase
Solution Approach 1:
The control system dynamically adapts transmission operation based on detected vehicle state (jump vs. non-jump). During jump conditions, the system prevents gear shifts to avoid mechanical damage, while allowing normal shifting operations during non-jump conditions. This dynamic control strategy resolves the contradiction by enabling efficient shifting when safe and preventing damage when risky, without requiring hardware modifications.
2Device complexity
If road vehicle control schemes are applied to off-road vehicles, then automatic transmission control is simplified, but adaptability to off-road conditions deteriorates
Solution Approach 1:
The control system monitors acceleration parameters along three spatial axes and vehicle speed to detect jump conditions. Based on these parameter changes, the system automatically adjusts its control strategy - preventing shifts during detected jumps and allowing normal operation otherwise. This parameter-based adaptation provides off-road suitability without requiring completely new control architecture.
3Productivity
If gear shifting is allowed during jump conditions, then shifting efficiency is maintained, but mechanical stress and reliability risks increase
Solution Approach 1:
The control system takes preliminary action by detecting jump conditions and preemptively preventing gear shifts before mechanical damage can occur. The system monitors acceleration and speed parameters, identifies jump states, and blocks shift commands during these conditions. This preliminary protective action resolves the contradiction by preventing harmful shifts while maintaining efficient operation during safe conditions.
Data Source
AI summary
A method for controlling an automatic transmission of a vehicle. The method includes determining a torque of an engine of the vehicle; performing at least one transmission operation comprising actuating a clutch of the transmission by increasing or decreasing a pressure of transmission fluid routed to the clutch; during actuating: determining an input speed and output speed of the clutch; determining that the clutch is slipping; while the clutch is slipping, recording the pressure of transmission fluid routed to the clutch; calculating a torque transmitted by the clutch; associating the pressure of the transmission fluid routed to the clutch with the torque transmitted by the clutch to generate a clutch pressure-torque pairing; iteratively recording the clutch pressure-torque pairing for torque values; continuously calculating an adaptive pressure-torque function of the clutch based on clutch pressure-torque pairings; and controlling the transmission based on the adaptive pressure-torque function of the clutch.