Power Transmission Control Device for Reliable Torque
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Solution Overview
Problem
Conventional power transmission mechanisms in vehicles face challenges in ensuring reliable torque transmission to driving wheels, especially when starting on slopes, due to delayed torque responsiveness caused by hydraulic clutch type front-rear torque distribution systems.
Innovation Solution
A control device for a power transmission mechanism that includes a control section to increase power transmission capacity by controlling the fastening force of a power transmission element, utilizing velocity and acceleration information to determine when to fasten or unfasten the element, and using hydraulic oil pressure to enhance torque responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hydraulic clutch type front-rear torque distribution is used, then hydraulic responsiveness is improved, but torque responsiveness is not improved when vehicle starts
Solution Approach 1:
The control device increases power transmission capacity in advance when the vehicle transitions from traveling state to stop state, or when deceleration occurs. This preliminary action ensures that sufficient torque is available immediately when the vehicle starts again, resolving the torque responsiveness issue while maintaining hydraulic responsiveness
2Reliability
If power transmission capacity is increased before vehicle stop, then torque availability at start is improved, but unnecessary power transmission on uphill inclines may occur
Solution Approach 1:
The control device dynamically adjusts power transmission capacity based on real-time vehicle conditions including velocity, acceleration, and steering angle. By monitoring these parameters, the system increases power transmission capacity only when actually needed (during deceleration or transition to stop) and reduces it when not needed, optimizing both torque availability and energy efficiency
Solution Approach 2:
The control device changes the fastening force parameter of the power transmission element based on vehicle operating conditions. By adjusting this parameter according to velocity, acceleration, and steering angle, the system achieves reliable torque transmission at startup while avoiding unnecessary power transmission on uphill inclines
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The control device ensures that driving wheels can reliably obtain torque immediately after starting, particularly on slopes, by increasing power transmission capacity before the vehicle stops and inhibiting unnecessary power transmission on uphill inclines.
Implementation Method 1
the power transmission element (20) is configured to be fastened or unfastened by oil pressure of operating oil supplied from a hydraulic circuit (30)
Data Source
AI summary
A control device for a power transmission mechanism is provided, performing control so that a driving wheel reliably obtains torque when a vehicle is started. In a vehicle having a power transmission mechanism that includes a power transmission path transmitting power from a power source to a first driving wheel and a second driving wheel, and a power transmission element arranged in the power transmission path between the power source and the second driving wheel, a control device for a power transmission mechanism includes a control section controlling a fastening force of the power transmission element so as to control power transmission capacity of the power transmission mechanism from the power source to the second driving wheel, wherein when the control section acquires that the vehicle transitions from a traveling state to a stop state, the acquisition triggers the control section to increase the power transmission capacity.