Twin Clutch Gearshift Control for Transmission Load Reduction
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Solution Overview
Problem
The existing preshift control in automated manual transmissions increases inertia mass and load on the transmission output shaft, leading to worsened fuel efficiency due to the coupling with synchronous mesh mechanisms.
Innovation Solution
A gearshift control device that selectively engages or disengages the clutch using a twin clutch automated manual transmission system, optimizing the engagement of even-numbered or odd-numbered shafts to minimize transmission load and improve fuel efficiency by reducing unnecessary resistance during gear shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preshift control is implemented by coupling the transmission input shaft and output shaft via synchronous mesh mechanisms, then the current gearshift position can be achieved, but the inertia mass and load on the transmission output shaft increase, worsening fuel efficiency
Solution Approach 1:
The transmission system is divided into two independent clutch systems (first clutch and second clutch) operating on separate input shafts. This segmentation allows one clutch to remain disengaged during gear shifts, preventing the synchronous mesh mechanisms from coupling the input and output shafts, thereby eliminating the harmful inertia mass and load while still achieving the desired gearshift position through the engaged clutch system
Solution Approach 2:
The harmful element (synchronous mesh mechanism coupling) is extracted or removed from the active transmission path during gear shifts. By using the twin clutch system, the patent ensures that the clutch not currently transmitting torque remains disengaged, effectively taking out the synchronous mesh mechanism from the load path, thus eliminating the energy loss associated with preshift operations
2Ease of operation
If synchronous mesh mechanisms are used to achieve gearshift position, then gear transmission can be switched, but transmission load increases due to coupling inertia mass
Solution Approach 1:
The transmission system is segmented into two independent clutch-gear sets (first clutch with first input shaft, second clutch with second input shaft). This segmentation enables one set to handle gear transmission switching while the other remains disengaged, preventing the coupling of inertia mass through synchronous mesh mechanisms and thereby reducing transmission load during gear shifts
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 solution effectively reduces transmission load and enhances fuel efficiency during automatic driving by strategically managing clutch engagement and disengagement, thereby improving the overall performance of the vehicle.
Implementation Method 1
a clutch which transmits or blocks a torque of an engine which is a driving force source
Implementation Method 2
the synchronous mesh mechanisms are switched
Implementation Method 3
the coupling with the synchronous mesh mechanism increases an inertia mass to be applied to the transmission output shaft and produces a load
Data Source
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AI summary
There is proposed a gearshift control device which can reduce a transmission load due to preshift, and improve fuel efficiency of a vehicle. A gearshift control device which controls a transmission 50 including two systems of power transmission mechanisms, and preshifts the transmission 50 based on a traveling plan during automatic driving of a vehicle. The gearshift control device makes automatic driving preshift execution decision of planning control contents of the transmission 50 based on the traveling plan, and preshift execution decision of deciding whether or not to preshift the transmission based on a control plan of the transmission 50.