Clutch Control via Input Output Power Ratio
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Solution Overview
Problem
Existing clutch controlling apparatuses struggle to accurately distinguish between engine rotation increases due to acceleration and clutch slip during shift changes, leading to potential misapplication of correction in engagement control, which can result in unnecessary clutch engagement adjustments.
Innovation Solution
A clutch controlling apparatus that calculates the input/output power ratio between the engine and countershaft to determine the target control amount for the clutch, with adjustments based on the variation of this ratio and elapsed time, allowing for precise detection of clutch slip and appropriate control during shift changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control based on engine rotation is used to detect clutch slip state, then clutch engagement control can be optimized, but engine acceleration may be misdetected as clutch slip causing unnecessary correction
Solution Approach 1:
The patent introduces an intermediary variable (input/output power ratio R) that mediates between engine rotation and clutch slip detection. By calculating R = Ne/Nc and comparing its variation to a threshold, the system indirectly detects clutch slip without directly monitoring engine rotation changes, thereby avoiding false detection during acceleration while maintaining reliable clutch slip identification
Solution Approach 2:
The patent changes the detection parameter from direct engine rotation monitoring to input/output power ratio monitoring. By transforming the detection basis from absolute rotation values to a ratio parameter (R = Ne/Nc) and its variation (ΔR), the system achieves more accurate clutch slip detection that distinguishes between acceleration-induced rotation changes and clutch slip-induced rotation changes
2Ease of operation
If clutch engagement control is continuously adjusted, then smooth engagement can be achieved, but excessive burden is imposed on the clutch reducing its service life
Solution Approach 1:
The patent implements feedback control by continuously monitoring the input/output power ratio R and its variation ΔR during clutch engagement. When ΔR exceeds the threshold indicating clutch slip, the system adjusts the target control amount accordingly, creating a closed-loop control that achieves smooth engagement while minimizing unnecessary adjustments and reducing burden on the clutch
Solution Approach 2:
The patent applies partial correction only when necessary (when clutch slip is detected through ΔR threshold comparison). Instead of continuous full correction, the system selectively applies engagement control adjustments only in situations where clutch slip is actually occurring, thereby achieving smooth engagement where needed while reducing overall burden on the clutch
Data Source
AI summary
A clutch controlling apparatus includes a shift change transmission having a plurality of gear trains between a main shaft on an input side and a countershaft on an output side. A clutch controls transmission of power between the shift change transmission and an engine between engagement an disengagement. The clutch controlling apparatus automatically controls the clutch upon shift change of the shift change transmission. An input power ratio is calculated as a ratio between a rotation of the engine and a rotation of the countershaft. If the input/output power ratio exceeds a predetermined value in a direction of a rise of the rotation of the engine during shift change of the shift change transmission, a target control amount of the clutch is corrected in a clutch engagement direction.