Friction Clutch Current Control for Responsive Torque Transfer
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Solution Overview
Problem
Existing driving force transmission devices in four-wheel drive vehicles face challenges in accurately adjusting the transmitted torque to match the torque command value, especially when the torque command value increases, due to the discharge of lubricating oil affecting the responsiveness of the main clutch.
Innovation Solution
A driving force transmission control device that calculates a torque command value and sets an electric current command value based on the magnitude and time change of the torque command value, performing electric current feedback control to supply the corresponding current to an actuator pressing a friction clutch, enhancing the controllability of the transmitted torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the electric current command value is corrected to be increased to promote discharge of lubricating oil, then the responsiveness of transmission torque is enhanced, but the driving force transmitted by the main clutch cannot be accurately adjusted to match the torque command value
Solution Approach 1:
The control device changes the parameter of electric current command value dynamically based on the change amount of torque command value. When the torque command value changes significantly, the electric current command value is increased to discharge lubricating oil and improve responsiveness. When the torque command value changes gradually, the electric current command value is maintained at normal levels to ensure accurate torque transmission. This parameter adjustment resolves the contradiction between responsiveness and accuracy.
Solution Approach 2:
The control system dynamically adjusts the electric current command value based on real-time torque command value changes. The control device determines whether to increase the electric current command value by comparing the change amount of torque command value against a threshold, making the system adaptive to different operating conditions. This dynamic adjustment allows the system to optimize both responsiveness and accuracy according to actual needs.
2Device complexity
If a fixed electric current command value is used, then the control system is simple, but the controllability of transmitted torque deteriorates when torque command value changes significantly
Solution Approach 1:
The control device incorporates feedback by monitoring the torque command value and its change amount, then adjusting the electric current command value accordingly. This feedback mechanism allows the system to automatically determine when to increase the electric current command value to discharge lubricating oil, improving torque controllability without requiring complex manual intervention or overly complicated control logic.
Solution Approach 2:
The system changes the electric current command value parameter based on the torque command value change amount. This simple parameter adjustment approach improves controllability by adapting the electric current to actual operating conditions without introducing complex control structures, maintaining ease of operation while enhancing performance.
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
This configuration improves the controllability of the torque transmitted by the driving force transmission device, ensuring accurate adjustment of the driving force to match the torque command value, even during sudden changes.
Implementation Method 1
a main clutch including a plurality of inner clutch plates and a plurality of outer clutch plates disposed between the outer case and the inner shaft, a cam mechanism generating a thrust force that presses the main clutch by relative rotation of a pair of cam members, and a pilot clutch transmitting a rotational force to one of the cam members to rotate relative to the other one of the cam members. The pilot clutch has an electromagnetic coil to which an electric current is supplied from a control device
Implementation Method 2
the frictional sliding between the clutch plates is lubricated by the lubricating oil
Data Source
AI summary
A driving force transmission control device includes a driving force transmission device configured to press a friction clutch by an actuator and a controller configured to control the driving force transmission device. The controller calculates a torque command value indicating a driving force to be transmitted from a rotating member on an input side to a rotating member on an output side based on information of a vehicle. The controller sets an electric current command value according to a magnitude and an amount of time change of the torque command value. The electric current command value is a target value of an electric current. The controller performs electric current feedback control such that an electric current corresponding to the calculated electric current command value is supplied to the actuator.