Clutch Control Method for Vehicle Stuck State Escape
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Solution Overview
Problem
Vehicles with clutch control systems struggle to maintain durability and escape stuck states on sandy or rough terrain due to prolonged half-engaged clutch states, leading to engine stall and reduced torque output.
Innovation Solution
A control method that transitions the clutch from a half-engaged to an engaged state based on rotational velocity differences and executes moving start controls to increase output rotational velocity, ensuring the clutch engages when specific conditions are met, such as increased heat release and throttle opening, to enhance torque delivery and escape stuck situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clutch is forcibly engaged when heat release reaches a predetermined value, then clutch durability is improved, but the vehicle cannot escape stuck state when engine output torque is insufficient
Solution Approach 1:
The controller preliminarily increases the engine output rotational velocity before forcing clutch engagement. This preliminary action ensures that sufficient torque is available when the clutch engages, preventing engine stall while still protecting clutch durability through controlled engagement timing.
Solution Approach 2:
The system dynamically adjusts engine output rotational velocity based on clutch state and vehicle conditions. By making the engine rotational velocity adjustable and responsive to real-time conditions, the system can optimize both clutch protection and stuck-state escape capability.
2Ease of operation
If the clutch remains in half-engaged state for a long period, then the system waits for rotational velocity equality, but clutch durability deteriorates
Solution Approach 1:
The controller implements periodic monitoring of the clutch state and rotational velocity difference. When the half-engaged state persists beyond a predetermined time threshold, the controller intervenes to force engagement, creating a periodic check-and-act cycle that protects the clutch while maintaining automatic control.
Solution Approach 2:
The system continuously monitors clutch rotational velocity difference and time duration, providing feedback to the controller. This feedback mechanism enables the controller to make informed decisions about when to force clutch engagement, balancing automatic control convenience with clutch durability protection.
3Speed
If the clutch is engaged when rotational velocity difference is large, then the vehicle can escape stuck state faster, but engine stall occurs due to insufficient torque
Solution Approach 1:
The controller preliminarily increases engine output rotational velocity before clutch engagement. This ensures that when the clutch engages even with a large rotational velocity difference, the engine has sufficient torque储备 to handle the load transition without stalling.
Solution Approach 2:
The system changes the engine output rotational velocity parameter in response to detected stuck conditions. By adjusting this parameter upward before clutch engagement, the system prepares the engine to withstand the torque demand of rapid engagement, preventing stall while achieving faster stuck-state escape.
Data Source
AI summary
A controller causes a clutch to transition from a half-engaged state to an engaged state when a difference in rotational velocity between input and output sides of the clutch falls within a predetermined range in the half-engaged state of the clutch. The controller executes a moving start control to increase an output rotational velocity of a prime mover and cause the clutch to transition to the engaged state when a predetermined first condition is satisfied in the half-engaged state of the clutch.