Clutch Control Device for Shift Shock Reduction
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Solution Overview
Problem
Existing clutch control devices fail to consistently reduce shift shock across varying clutch engagement points due to thermal expansion or wear of clutch disks, leading to suboptimal performance.
Innovation Solution
A clutch control device that includes engine speed and vehicle speed detection, with a clutch control portion performing feedback control to maintain a predetermined ratio of engine speed to vehicle speed, using a clutch engagement control map that adjusts for each gear position, allowing for optimal engagement control regardless of changes in the clutch engagement point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clutch engagement point is controlled based on initial position, then shift shock reducing effect is achieved in initial condition, but shift shock reducing effect deteriorates when clutch engagement point changes due to thermal expansion or wear
Solution Approach 1:
The patent implements feedback control by detecting the actual clutch engagement point (meet point) during operation and using this detected information to adjust the clutch control strategy. The ECU continuously monitors the engagement point and modifies control parameters based on the detected position, ensuring optimal shift shock reduction regardless of thermal expansion or wear-induced changes in the clutch engagement characteristics.
Solution Approach 2:
The patent changes control parameters dynamically based on detected clutch engagement point variations. When the engagement point shifts due to thermal expansion or wear, the system adjusts control parameters such as clutch release timing, engagement speed, and torque transfer characteristics to maintain optimal shift shock reduction performance across different operational conditions.
2Reliability
If clutch control is adjusted for each gear position, then optimal engagement control is achieved, but device complexity increases
Solution Approach 1:
The patent implements a universal clutch control strategy that functions across all gear positions using a single detection and control system. The ECU detects the clutch engagement point and applies appropriate control adjustments regardless of the current gear position, eliminating the need for separate control mechanisms for each gear while maintaining optimal engagement control across the entire transmission range.
Data Source
AI summary
A clutch control device for obtaining a good shift shock reducing effect regardless of a change in clutch engagement point. A target NeV database stores a target NeV map as a target value of the ratio between an engine speed (Ne) and a vehicle speed (V) obtained from the engine speed after primary speed reduction by a gear transmission. The time period from the time of detection of a downshift operation to the time of completion of the reengagement of the clutch is composed of a first period until the clutch becomes a partially engaged condition after disengagement of the clutch, a second period during which the partially engaged condition is maintained, and a third period from the time when the clutch in the partially engaged condition starts to be driven in its engaging direction to the time when the reengagement of the clutch is completed.