Clutch Engagement Control Using Engine Speed Feedback
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Solution Overview
Problem
Existing clutch control systems face challenges in accurately adjusting the clutch connection position due to unexpected changes in engine rotational speed and clutch parameter deviations, leading to inconsistent clutch operation.
Innovation Solution
A clutch control device that includes an engine, transmission, clutch device, clutch actuator, and control unit, which detects control parameters and adjusts the clutch capacity by correcting the control target value based on engine rotational speed and actual measurement differences, switching between motor duty ratio control and feedback control to ensure precise clutch engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the clutch capacity is adjusted to ensure accurate connection position, then the clutch connection precision is improved, but the engine rotational speed stability deteriorates when the clutch capacity is excessively large
Solution Approach 1:
The patent implements feedback control by detecting the actual clutch capacity during the stroke process and comparing it with the target value. When the actual value deviates from the target, the control unit adjusts the clutch actuator to correct the deviation, ensuring accurate connection position while monitoring engine speed responses.
Solution Approach 2:
The patent dynamically adjusts the clutch capacity during the connection process based on real-time detection of actual capacity values and engine speed conditions. The control unit modifies the target clutch capacity dynamically rather than using a fixed value, allowing adaptation to changing engine states during the stroke process.
2Measurement precision
If the clutch capacity is adjusted to ensure accurate connection position, then the clutch connection precision is improved, but the engine rotational speed stability deteriorates when the clutch capacity is excessively small
Solution Approach 1:
The feedback mechanism continuously monitors both the clutch capacity and engine rotational speed. When the clutch capacity is too small causing engine speed to increase, the system detects this deviation and adjusts the clutch actuator to increase capacity, thereby maintaining connection precision while stabilizing engine speed.
Solution Approach 2:
The system dynamically responds to engine speed changes by adjusting clutch capacity in real-time. If engine speed increases indicating insufficient clutch capacity, the control unit modifies the target capacity dynamically to prevent excessive speed rise while achieving accurate connection.
3Reliability
If the clutch connection position is adjusted in real-time based on engine speed and parameter deviations, then the clutch operation consistency is improved, but the control system complexity increases
Solution Approach 1:
The patent employs feedback control where the control unit detects actual clutch capacity during the stroke process and compares it with the target value. Based on this feedback and engine speed information, the system automatically adjusts the clutch actuator to correct deviations, ensuring consistent operation without requiring complex manual intervention systems.
Solution Approach 2:
The control system performs self-adjustment by automatically detecting deviations between actual and target clutch capacity values and correcting them through the clutch actuator. This self-service capability improves operational consistency while avoiding the need for additional complex external control mechanisms.
4Measurement precision
If the control target value is corrected based on the difference between target and actual measurement values, then the clutch connection accuracy is improved, but the control response time increases
Solution Approach 1:
The feedback control operates continuously during the stroke process, detecting actual clutch capacity values and comparing them with target values in real-time. This continuous feedback allows for timely corrections without significant delay, balancing accuracy with response time by making incremental adjustments based on detected deviations.
Solution Approach 2:
The system performs preliminary detection of the actual clutch capacity during the stroke process before final connection is achieved. By detecting and correcting deviations early in the process, the system can make necessary adjustments to the target value in advance, improving final connection accuracy while minimizing overall control response time.
Data Source
AI summary
This clutch control device includes an engine (13), a transmission (21), a clutch device (26) configured to connect and disconnect motive power transmission between the engine (13) and the transmission (21), a clutch actuator (50) configured to drive the clutch device (26) and change a clutch capacity, a control parameter sensor (58) configured to detect a control parameter of the clutch capacity and a control unit (60) configured to calculate a control target value (TP) of the control parameter. The control unit (60) causes the clutch device (26) to perform a stroke in a connection direction until an actual measurement value of the control parameter reaches the control target value (TP). The control unit (60) corrects the control target value (TP) in accordance with at least one of a rotational speed (NE) of the engine (13) and a difference between the target value and the actual measurement value of the control parameter in a stroke process (K3) of causing the clutch device (26) to perform the stroke in the connection direction.