Sequential Clutch Oil Pressure Control for AMT
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Solution Overview
Problem
Existing clutch control systems for transmissions experience operational delays when starting the engine due to oil pressure leakage and the need for simultaneous oil pressure supply to multiple clutches, which requires excessive hydraulic pump capacity and complicates control.
Innovation Solution
A clutch control system that supplies oil pressures to hydraulic clutches at different timings upon engine start, using a control unit to manage oil pressure distribution between two clutches, allowing for earlier preparation of one clutch before the other, thus avoiding excessive oil quantity demands and simplifying hydraulic pump capacity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oil pressures are supplied to multiple clutches simultaneously at engine start, then all clutches are prepared for driving, but excessive oil quantity is needed instantaneously causing master oil pressure to drop and requiring larger hydraulic pump capacity
Solution Approach 1:
The control unit performs preliminary actions by supplying oil pressure to one clutch first, then subsequently to the other clutch. This sequential preliminary action ensures each clutch is prepared in advance without requiring simultaneous oil supply, thereby avoiding excessive oil quantity demands and master pressure drops while maintaining reliable clutch operation.
2Reliability
If oil pressures are supplied to multiple clutches simultaneously at engine start, then all clutches are prepared for driving, but hydraulic pump capacity must be increased to maintain master oil pressure
Solution Approach 1:
The control unit performs preliminary actions by supplying oil pressure to one clutch first, then subsequently to the other clutch. This sequential preliminary action ensures each clutch is prepared in advance without requiring simultaneous oil supply, thereby avoiding excessive oil quantity demands and master pressure drops while maintaining reliable clutch operation.
3Reliability
If computation of times to supply oil pressures is conducted for each clutch, then oil passages are filled up with working oil before clutch driving command, but complicated control is needed
Solution Approach 1:
The control unit performs preliminary actions by supplying oil pressure to one clutch first, then subsequently to the other clutch. This sequential preliminary action ensures each clutch is prepared in advance without requiring simultaneous oil supply, thereby avoiding excessive oil quantity demands and master pressure drops while maintaining reliable clutch operation.
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 approach prevents operational delays, enhances clutch response, and allows for a smaller transmission design by optimizing hydraulic pump capacity and sequence of oil pressure supply, ensuring smooth clutch operation and quicker vehicle starting.
Implementation Method 1
a hydraulic pump for supplying oil pressures for driving the hydraulic clutches
Implementation Method 2
oil passages connected respectively to the hydraulic clutches so as to transmit the oil pressures
Data Source
AI summary
A clutch control system for a twin-clutch type automatic/manual transmission AMT includes a hydraulic pump for driving a first clutch and a second clutch and oil passages for transmitting oil pressures and an AMT control unit for controlling the supply of oil pressures into the oil passages. Upon detection of an engine starting operation, the AMT control unit performs an initial preparatory operation in which the oil pressures are supplied into the oil passages at different timings so as to fill up the oil passages with a working oil, thereby completing the preparations for driving of the clutches. When the oil pressure is supplied into the oil passage after a predetermined oil pressure is generated in the oil passage, the period of time taken for a first speed gear to become usable is shortened, whereby a swift vehicle starting after the starting of the engine can be achieved.