Gearbox Clutch Slip Control via Angular Acceleration Feedback
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Solution Overview
Problem
Existing methods for controlling clutch slip in gearboxes rely on characteristic maps, which are influenced by various factors, leading to potential rattling noises and increased fuel consumption due to safety margins, making them inefficient and environmentally unfriendly.
Innovation Solution
A method that measures rotational speed and angular acceleration to produce a rattling characteristic value, which is compared to a threshold value to control clutch slip, eliminating the need for complex characteristic maps and allowing real-time feedback for improved noise reduction and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If characteristic maps with safety margins are used to control clutch slip, then rattling noises are avoided, but fuel consumption increases
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the actual clutch slip and comparing it with the target slip value. Based on this comparison and the determined influence values (wear, tolerances, temperature), the control system dynamically adjusts the clutch actuation in real-time, replacing static characteristic maps with adaptive closed-loop control that eliminates the need for excessive safety margins
Solution Approach 2:
The system dynamically changes control parameters by determining influence values related to component wear and tolerances, then adjusting the target clutch slip and actuation characteristics accordingly. This allows the control strategy to adapt to varying vehicle conditions without requiring fixed safety margins, optimizing both noise reduction and fuel efficiency
2Device complexity
If characteristic maps are used to control clutch slip, then control is simplified, but accuracy decreases due to wear and tolerances
Solution Approach 1:
The patent employs feedback control by continuously measuring actual clutch slip and comparing it with the target value. The control system determines influence values related to component wear and tolerances, then dynamically adjusts the actuation to compensate for these variations, maintaining high accuracy without increasing overall system complexity
Solution Approach 2:
The control system performs self-adjustment by automatically determining influence values from sensor data and modifying the clutch control strategy accordingly. This self-service capability allows the system to compensate for wear and tolerances without requiring complex external calibration or adjustment mechanisms
Data Source
AI summary
A method for controlling a slip of a clutch device of a gearbox of a vehicle includes measuring at least one rotational speed value on a gearbox shaft of the gearbox; determining an active gearbox shaft; determining the angular acceleration on the active gearbox shaft determined, on the basis of the at least one measured rotational speed value; producing a rattling characteristic value on the basis of the angular acceleration determined over at least one time interval; and controlling the slip of the clutch device on the basis of a comparison of the rattling characteristic value produced with at least one rattling threshold value.