Agricultural Vehicle Engine Torque Control for Smooth Gear Shifting
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Solution Overview
Problem
Existing agricultural vehicle systems face interference during gear shifting due to the need to maintain constant engine speed, which hampers the gear shifting process in automatic transmission systems.
Innovation Solution
A control system comprising a vehicle controller, transmission controller, and engine controller that temporarily transitions from maintaining constant engine speed to constant torque during gear shifts, allowing the transmission system to shift gears smoothly without engine interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the cruise control system maintains constant engine speed, then the engine operates efficiently at desired RPM, but the gear shifting process is interfered with and cannot complete smoothly
Solution Approach 1:
The system dynamically switches between constant speed control and constant torque control modes based on transmission state. During gear shifting, the engine control transitions from maintaining constant RPM to maintaining constant torque, allowing the engine speed to vary naturally to facilitate smooth gear engagement, then returns to constant speed control after shifting completes
Solution Approach 2:
The control system changes the regulated parameter from engine speed to engine torque during gear shifting events. This parameter change allows the engine to provide the necessary speed variations for smooth gear transitions while the transmission is shifting, resolving the conflict between speed stability and shifting smoothness
Data Source
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AI summary
A system and method for controlling a transmission system (52) is provided. One agricultural vehicle (10) includes a vehicle controller (52) configured to instruct an engine controller (46) to maintain an engine (54) at a constant speed and to receive a first signal from a transmission controller (44) indicative of gear shift initiation. The vehicle controller (42) is also configured to instruct the engine controller (46) to maintain the engine (54) at a current torque upon receipt of the first signal and to receive a second signal from the transmission controller (44) indicative of gear shift completion. The vehicle controller (42) is configured to instruct the engine controller (46) to maintain the engine (54) at the constant speed upon receipt of the second signal.