Powertrain Control Device for Centrifugal Pendulum Damper
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Solution Overview
Problem
The existing control devices for powertrains with centrifugal pendulum dampers face issues with torque fluctuations, leading to vibration and noise, and the engagement/disconnection mechanism's moment of inertia changes cause lengthened gear shift durations and transmission shocks during gear shifts.
Innovation Solution
A control device with a transmission characteristic changing module that adjusts the hydraulic pressure based on the engagement degree of the connection/disconnection mechanism, ensuring accurate gear shift control and preventing performance degradation by dynamically changing the transmission hydraulic pressure according to the moment of inertia and engagement state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a connection/disconnection mechanism is disposed between the power transmission shaft and the centrifugal pendulum damper to suppress abnormal noise, then abnormal noise generation is suppressed, but the gear shift duration is lengthened and transmission shock may occur due to moment of inertia changes
Solution Approach 1:
The connection/disconnection mechanism is designed to dynamically change its engagement state based on operating conditions. The control device detects gear shift status and adjusts the engagement degree of the connection/disconnection mechanism accordingly, allowing it to be disengaged during gear shifts to reduce moment of inertia and engaged during normal operation to suppress abnormal noise.
Solution Approach 2:
The control device changes the engagement degree parameter of the connection/disconnection mechanism based on detected gear shift status. By adjusting this parameter, the system optimizes the balance between noise suppression and gear shift performance, preventing both abnormal noise and excessive gear shift duration.
2Power
If the engagement degree of the connection/disconnection mechanism increases to a slip state or fully engaged state during gear shift control, then torque transmission is improved, but the gear shift control cannot accommodate the moment of inertia change and gear shift duration is lengthened
Solution Approach 1:
The system dynamically adjusts the engagement degree of the connection/disconnection mechanism during gear shift control. The control device detects gear shift status and temporarily reduces the engagement degree to minimize moment of inertia changes, allowing gear shift control to proceed smoothly without lengthening duration.
Solution Approach 2:
The control device performs preliminary detection of gear shift status and proactively adjusts the engagement degree of the connection/disconnection mechanism before the gear shift is completed, ensuring that moment of inertia changes are minimized and do not affect gear shift duration.
3Power
If the moment of inertia of the power transmission shaft is rapidly increased when the connection/disconnection mechanism changes to engaged state, then torque transmission is improved, but transmission shock is generated
Solution Approach 1:
The control device detects when gear shift control is being performed and beforehand adjusts the engagement degree of the connection/disconnection mechanism to prevent rapid moment of inertia changes. This cushioning action prevents transmission shock from occurring during critical gear shift operations.
Solution Approach 2:
The system changes the engagement degree parameter of the connection/disconnection mechanism based on gear shift detection. By controlling this parameter to remain in a reduced state during gear shifts, the system prevents rapid moment of inertia changes and the resulting transmission shock.
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 solution effectively stabilizes gear shifts, prevents transmission shocks, and maintains transmission performance by accurately adjusting hydraulic pressure in response to changes in the engagement degree of the connection/disconnection mechanism, ensuring smooth operation even during changes in engagement states.
Implementation Method 1
the centrifugal pendulum damper has a support member which rotates together with a power transmission shaft, and a pendulum which is a mass supported by the support member so as to be able to swing centered on a circumferential point at a fixed radius from an axial center of the support member. When the pendulum swings due to torque fluctuations, a circumferentially-directed component of force is generated in the support member which receives the centrifugal force acting on the pendulum.
Implementation Method 2
a connection/disconnection mechanism of the present invention is a frictionally-engaged type of clutch which transmits power by frictional force and which can smoothly transmit torque, even when there is a difference in rotational speeds between an input shaft and an output shaft
Data Source
AI summary
A control device of a powertrain with a centrifugal pendulum damper is provided comprising a power transmission shaft which transmits power between a drive source and an automatic transmission, and a centrifugal pendulum damper which is coupled to the power transmission shaft and a connection/disconnection mechanism. The automatic transmission has a transmission mechanism of a hydraulic pressure control type, which includes a transmission control module which performs a control to supply transmission hydraulic pressure to the transmission mechanism. The transmission control module includes a transmission characteristic changing module which changes a control characteristic of transmission hydraulic pressure according to an engagement degree of the connection/disconnection mechanism.