Engine-Transmission Clutch Control via Hydraulic Timing
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Solution Overview
Problem
Existing power output apparatuses require continuous low pressure control to maintain hydraulic pressure levels, leading to reduced energy efficiency and potential shocks during engine-transmission connection, without considering optimal engagement timing.
Innovation Solution
A power output apparatus that includes a start connection control module to set fluid supply timing based on measured rotation speeds of the engine and transmission, ensuring synchronized connection and reducing shocks by controlling the hydraulic pressure supply for efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous low pressure control is performed to maintain hydraulic pressure level, then clutch engagement reliability is improved, but energy consumption increases due to continuous electric oil pump actuation
Solution Approach 1:
The patent implements periodic action by performing low pressure control only at specific timing (immediately before clutch engagement) rather than continuously. The control module stops the electric oil pump after low pressure control is completed, and restarts it only when needed for the next engagement event, converting continuous operation into periodic operation that maintains reliability while reducing energy consumption.
Solution Approach 2:
The patent applies preliminary action by performing low pressure control in advance immediately before clutch engagement is required. By regulating hydraulic pressure to a low level beforehand and then maintaining it without continuous pump operation, the system ensures clutch engagement reliability is achieved at the critical moment while avoiding unnecessary continuous energy consumption.
2Object-affected harmful factors
If fluid supply timing is not optimized, then clutch engagement may occur with shocks, but determining optimal timing increases control complexity
Solution Approach 1:
The patent implements feedback control by using the rotation speed sensor to continuously monitor the rotation speeds of both the engine and transmission. The control module compares these speeds and determines the optimal fluid supply timing based on the measured speed difference, adjusting the low pressure control timing to achieve smooth engagement without shocks while maintaining relatively simple control logic through direct speed comparison.
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 enhances energy efficiency and reduces potential shocks during engine-transmission connection by optimizing the fluid supply timing, ensuring smooth power transfer and improved vehicle performance.
Implementation Method 1
a connection disconnection structure that utilizes a hydraulic pressure of an operating fluid to connect and disconnect the power shaft of the internal combustion engine with and from the input shaft of the change-speed transmission mechanism
Data Source
AI summary
A power output apparatus that outputs power to a driveshaft, the power output apparatus includes an internal combustion engine, a change-speed transmission mechanism, a connection disconnection structure, a power shaft rotation speed measurement unit, an input shaft rotation speed measurement unit, a start connection control module, and a start connection control module controlling at least one of the internal combustion engine and the change-speed transmission mechanism to make the power shaft rotation speed of the internal combustion engine approach to the input shaft rotation speed of the change-speed transmission mechanism, and controlling the connection disconnection structure to connect the power shaft of the internal combustion engine with the input shaft of the change-speed transmission mechanism at the set fluid supply start timing.