Torque Measurement Encoder Placement on Clutch Cover
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Solution Overview
Problem
Conventional methods for measuring engine output torque in automobiles face challenges due to limited installation flexibility of torque measurement sensors in densely packed transmission mechanisms, particularly in dual clutch transmissions where torque paths change during speed shifts, making accurate torque determination difficult.
Innovation Solution
A rotation transmission apparatus with a torque measurement device that includes a pair of rotary bodies, a connection member, and sensors, where the encoders and sensors are installed between the engine's damper and the clutch mechanism, allowing for easier installation and measurement of output torque by detecting phase differences in output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pair of encoders and sensors for measuring torque are installed in a transmission case where a large number of components constituting the transmission mechanism are densely stored, then torque measurement function is achieved, but degree of freedom of installation of the pair of encoders and sensors is low and design of the transmission is difficult
Solution Approach 1:
The patent extracts the torque measurement function from the densely packed transmission mechanism interior and relocates it to the transmission case cover. By installing encoders and sensors on the cover rather than within the transmission mechanism, the system achieves torque measurement capability while gaining significant installation flexibility and design freedom in the main transmission assembly.
2Measurement precision
If torque is measured by installing sensors in the transmission mechanism, then torque magnitude can be measured, but in dual clutch transmission where torque path changes during speed stages and branches during shift change, it is difficult to accurately determine the magnitude of the output torque of the engine
Solution Approach 1:
The patent introduces the transmission case cover as an intermediary measurement platform. By installing encoders on the input shaft and output shaft, and sensors on the stationary cover, the system measures torque through the rotational relationship between these components. This intermediary approach allows accurate torque determination regardless of the complex internal torque path changes in dual clutch transmissions during speed stage transitions and shift operations.
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 enables easy installation and accurate measurement of engine output torque regardless of transmission type, even during speed changes, by increasing the degree of freedom in sensor placement and allowing torque measurement before input to the transmission mechanism.
Implementation Method 1
converting an elastic twist deformation amount of the torque transmission member into a phase difference between output signals of a pair of sensors
Data Source
AI summary
First and second encoders are fixed to a drive plate and a clutch cover of which the center portions are connected to each other via a connection shaft and which are disposed between, in a transfer path for torque outputted from an engine, a damper and a connecting/disconnecting part of a clutch mechanism of a transmission. At the same time, detection units of first and second sensors are opposed to portions to be detected of the first and second encoders, respectively.