Construction Vehicle Clutch Switchover Control
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Solution Overview
Problem
Conventional construction vehicles experience clutch switchover shock due to inconsistent matching of traction forces during transitions between two-motor and one-motor traveling modes, which occurs when the clutch is switched based on a predetermined vehicle velocity rather than matching traction forces.
Innovation Solution
Incorporating an accelerator opening degree detection unit and a vehicle velocity detection unit to determine a switchover velocity that corresponds to the accelerator opening degree, allowing the clutch to be switched between transmission and non-transmission states at appropriate velocities, thereby reducing clutch switchover shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the clutch is switched over when the vehicle velocity reaches a predetermined velocity, then the clutch switchover can be controlled at a specific velocity point, but the clutch switchover shock is easily generated because the traction force during two-motor traveling mode does not match the traction force during one-motor traveling mode
Solution Approach 1:
The invention changes the control parameter from fixed predetermined velocity to variable velocity determined by accelerator opening degree. The control unit calculates switchover velocity based on the detected accelerator opening degree, allowing the clutch switchover to occur at the appropriate velocity where traction forces match, thereby reducing clutch switchover shock while maintaining controlled velocity-based switching.
2Device complexity
If the clutch is switched over based on fixed predetermined velocity, then the control logic is simple, but the velocity at which traction forces match is not necessarily constant and varies depending on engine rotation speed and accelerator opening degree
Solution Approach 1:
The invention makes the clutch switchover velocity dynamic by linking it to the accelerator opening degree. Instead of using a fixed predetermined velocity, the control unit dynamically determines the appropriate switchover velocity based on the current accelerator opening degree, engine rotation speed, and vehicle state. This dynamic adjustment ensures that clutch switchover occurs at the velocity where traction forces match, improving switchover smoothness and reliability.
3Stability of the object's composition
If the clutch is switched over at predetermined velocity, then the switching timing is consistent, but it does not account for variations in engine rotation speed and accelerator opening degree that affect traction force matching
Solution Approach 1:
The invention implements feedback control by continuously monitoring the accelerator opening degree and using it to determine the appropriate clutch switchover velocity. The control unit receives feedback about the current operating state (accelerator opening degree, engine rotation speed, vehicle velocity) and adjusts the switchover timing accordingly. This feedback mechanism ensures that clutch switchover occurs at the velocity where traction forces match, reducing shock while maintaining consistent and appropriate switching timing.
Data Source
AI summary
The construction vehicle includes an engine, an accelerator pedal, a main pump configured to be driven by the engine, first and second traveling motors driven by pressured oil discharged from the main pump to generate driving force for traveling, a driving shaft configured to receive the driving force from the first traveling motor and the driving force from the second traveling motor, a clutch configured to switch between transmission and non-transmission of the driving force from the second traveling motor to the driving shaft, an accelerator opening degree detection unit, a vehicle velocity detection unit, and a control unit. The control unit is configured to determine the switchover velocity depending on the opening degree of the accelerator pedal, and to control the clutch when the vehicle velocity that is detected by the vehicle velocity detection unit reaches the switchover velocity.