Clutch Capacity Detection via Acceleration Filtering
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Solution Overview
Problem
Current clutch control systems in automatic transmissions face challenges in accurately determining when a clutch has reached torque carrying capacity, especially under conditions where noise and vibration can falsely indicate clutch engagement, leading to inefficiencies and potential deceleration during gear shifts.
Innovation Solution
A system comprising a desired pressure module, valve actuation module, filter module, and capacity detection module that selectively generates hydraulic pressure for the clutch, filters acceleration signals to reject noise, and determines clutch capacity based on filtered acceleration values, ensuring accurate torque transfer between input and output shafts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acceleration signals are used to detect clutch torque carrying capacity, then detection capability is provided, but noise and vibration cause false indications of clutch engagement
Solution Approach 1:
A filter module is introduced as an intermediary between the acceleration signal source and the capacity detection module. This filter removes noise and vibration components from the acceleration signal before it reaches the detection logic, allowing accurate clutch capacity detection without false indications from environmental interference.
Solution Approach 2:
The harmful noise and vibration components are extracted and removed from the acceleration signal through filtering. By separating the useful signal (actual clutch engagement indicators) from the harmful components (noise and vibration), the system achieves accurate detection without being affected by interfering factors.
2Productivity
If hydraulic pressure is applied to engage the clutch, then torque transfer is enabled, but inaccurate capacity detection leads to inefficiencies and potential deceleration
Solution Approach 1:
The system uses filtered acceleration signals as feedback to continuously monitor clutch engagement status and detect when torque carrying capacity is reached. This feedback mechanism allows the control system to adjust hydraulic pressure application timing and magnitude, ensuring reliable and efficient clutch engagement without causing deceleration or shifting inefficiencies.
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 enables precise detection of clutch torque carrying capacity, reducing noise-related errors and improving gear shift efficiency by filtering acceleration signals to differentiate between actual and noise-induced changes, thus enhancing the overall performance of automatic transmission systems.
Implementation Method 1
The valve actuation module actuates a solenoid valve based on the desired pressure
Implementation Method 2
The filter module filters an acceleration of a shaft of the automatic transmission to generate a filtered acceleration
Data Source
AI summary
A system for a vehicle includes a desired pressure module, a valve actuation module, a filter module, and a capacity detection module. The desired pressure module selectively generates an increase in a desired pressure of hydraulic fluid for a clutch of an automatic transmission. The valve actuation module actuates a solenoid valve based on the desired pressure. The solenoid valve supplies hydraulic fluid to a regulator valve, and the regulator valve supplies hydraulic fluid to the clutch. The filter module filters an acceleration of a shaft of the automatic transmission to generate a filtered acceleration. The capacity detection module indicates whether the clutch reached torque carrying capacity based on the filtered acceleration.