Automated Transmission Control for Faster Acceleration
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Solution Overview
Problem
Existing automated transmission control methods for vehicles with powershift and synchronized transmissions result in slow acceleration and poor efficiency due to the requirement of shifting each powershift gear within an engaged synchronized gear, leading to excessive gear engagement and inefficient vehicle acceleration.
Innovation Solution
Implement a method where the synchronized transmission upshifts based on a predetermined rotational speed rise or increased motor load, and the powershift transmission upshifts below a specific rotational speed threshold or low motor load, allowing direct engagement of gears in the synchronized transmission for faster acceleration, with the electronic control unit deciding on gear shifts based on motor load and rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If each powershift gear is shifted within an engaged synchronized gear, then the transmission control follows the known method, but the vehicle accelerates slowly and efficiency is poor
Solution Approach 1:
The patent applies dynamics by making the gear shifting strategy adaptive rather than fixed. The electronic control unit dynamically selects between two shifting modes based on real-time motor load conditions: synchronized transmission shifting when load is high, and powershift transmission shifting when load is low. This dynamic adaptation allows the system to optimize acceleration performance across varying operating conditions, directly resolving the contradiction between acceleration speed and energy efficiency.
Solution Approach 2:
The patent changes the control parameter from a fixed shifting sequence to a load-dependent variable strategy. By monitoring motor load and rotational speed, the system adjusts the gear shifting behavior - using synchronized gears for high-load conditions and powershift gears for low-load conditions. This parameter change enables the system to achieve both rapid acceleration and improved energy efficiency by matching the shifting strategy to actual operating conditions.
2Speed
If a gear of the synchronized transmission is shifted, then the vehicle can accelerate more rapidly, but the drive motor experiences too high a load when motor load is high
Solution Approach 1:
The patent implements feedback control by continuously monitoring motor load and rotational speed, then using this information to determine the appropriate gear shifting strategy. The electronic control unit receives feedback signals about current operating conditions and adjusts the shifting behavior accordingly - preventing synchronized gear shifts when motor load is high to avoid excessive stress, while allowing such shifts when load is low to maintain acceleration performance.
3Reliability
If all the gears of the powershift transmission are shifted, then the drive motor is not overloaded, but many powershift gears have to be engaged leading to slow acceleration
Solution Approach 1:
The system dynamically adapts the gear shifting strategy based on motor load conditions. When motor load is low, the system allows powershift gear engagement to protect the motor from overload. When motor load is high, the system switches to synchronized gear shifting to reduce acceleration time. This dynamic behavior resolves the contradiction between motor protection and acceleration speed by selecting the appropriate strategy based on real-time conditions.
Data Source
AI summary
A method of operating an automated transmission control for a powershift transmission having a plurality of powershift gears and a synchronized transmission having a plurality of synchronized gears in the drive-train of a vehicle. The drive-train includes a drive motor, the powershift transmission and the synchronized transmission, with an electronic control unit by which an upshift of the gears of the synchronized transmission and the upshift of the gears of the powershift transmission can be carried out, and to which a motor load signal representing the motor load of the drive motor and a rotational speed signal representing the rotational speed at the output of the drive motor can be sent.