Clutch Control Device for Minimizing Speed Change Shock
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Solution Overview
Problem
The existing clutch control device has a complex control algorithm, making it difficult to verify the reliability and stability of the control operation, which results in challenges in minimizing speed change shock during transmission shifts.
Innovation Solution
A clutch control device that includes a clutch switching pattern storage device, a selection device, and a hydraulic control system, which selects specific clutch switching patterns based on engine rotation rate and speed ratio detection to execute hydraulic control for hydraulic clutches, minimizing speed change shock by defining hydraulic pressure change profiles for disconnecting and connecting states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex control algorithms are used to determine optimal hydraulic control parameters, then speed change smoothness is improved, but control reliability verification becomes difficult
Solution Approach 1:
The patent segments the clutch control process into multiple discrete speed change patterns (e.g., 1st to 2nd gear, 2nd to 3rd gear, etc.). Each pattern has pre-determined hydraulic control parameters stored in memory, eliminating the need for complex real-time calculations while ensuring reliable and smooth speed changes for each specific transition.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and storing optimal hydraulic control parameters for each speed change pattern before actual operation. The ECU simply retrieves the appropriate pre-determined parameters based on the current speed change pattern, avoiding complex real-time computation while maintaining control reliability and smoothness.
2Adaptability or versatility
If multiple clutch switching patterns are stored for different speed change patterns, then adaptability to various operating conditions is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by storing specific clutch switching patterns tailored to each speed change pattern (e.g., different patterns for 1st-2nd gear vs. 2nd-3rd gear transitions). Each stored pattern contains hydraulic control parameters optimized for its specific gear transition, providing adaptability without requiring a universally complex control algorithm.
Solution Approach 2:
The patent utilizes parameter changes by storing multiple discrete clutch switching patterns with different hydraulic control parameters in the ECU memory. The system adapts to various operating conditions by selecting the appropriate pre-stored pattern based on the current speed change, avoiding the need for complex real-time parameter calculation while maintaining versatility.
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 enables optimal hydraulic control of hydraulic clutches, minimizing speed change shock and facilitating verification of control operation reliability and stability through a simpler control program.
Implementation Method 1
a hydraulic control device that executes hydraulic control for the plurality of hydraulic clutches in correspondence to the clutch switching pattern selected by the clutch switching pattern selection device
Data Source
AI summary
A clutch control device includes: a plurality of hydraulic clutches built into a transmission; a clutch switching pattern storage device in which a plurality of clutch switching patterns, each defining engage/release changeover timing with which the plurality of hydraulic clutches are engaged/released are stored in correspondence to individual speed change patterns adopted by the transmission; a clutch switching pattern selection device that selects a clutch switching pattern stored in the clutch switching pattern storage device in correspondence to a speed change pattern for the transmission at a time of speed change; and a hydraulic control device that executes hydraulic control for the plurality of hydraulic clutches in correspondence to the clutch switching pattern selected by the clutch switching pattern selection device.