Lockup Clutch Torque Transition Control
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Solution Overview
Problem
Existing lockup clutch control systems experience shocks during transitions from driven to driving states and vice versa due to rapid changes in target clutch torque capacity, and existing solutions are ineffective for all scenarios, particularly when transitioning from acceleration slip control to deceleration slip control.
Innovation Solution
A control apparatus for a lockup clutch that includes an electronic control unit to calculate and manage target clutch torque capacities for both driven and driving states, seamlessly transitioning between them based on accelerator state changes, ensuring coincident torque capacities to prevent shocks and optimize transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the target clutch torque capacity is immediately changed over at the time of driving/driven changeover, then the response speed of the control system is improved, but a shock occurs due to rapid change in target clutch torque capacity
Solution Approach 1:
The system performs preliminary comparison between driven target clutch torque capacity and driving target clutch torque capacity before executing the changeover. By checking whether the values coincide with each other in advance, the system ensures that the changeover occurs only when appropriate, preventing shocks while maintaining responsive control.
Solution Approach 2:
The system continuously monitors and compares the driven target clutch torque capacity and driving target clutch torque capacity, using this feedback information to determine the optimal timing for changeover. This feedback mechanism ensures that changeover occurs only when the torque capacities coincide, eliminating shocks while maintaining fast response.
2Productivity
If the target clutch torque capacity is changed over rapidly during accelerator state transition, then the control efficiency is improved, but the transition smoothness deteriorates due to shock occurrence
Solution Approach 1:
The system performs preliminary comparison of torque capacities before changeover execution, ensuring that the transition occurs only when the driven and driving target clutch torque capacities coincide. This preliminary check maintains control efficiency while ensuring smooth transitions without shock.
Solution Approach 2:
The system changes the target clutch torque capacity parameter only when specific conditions are met (when driven and driving target values coincide). This conditional parameter change approach maintains both control efficiency and transition smoothness by avoiding abrupt changes that would cause shock.
3Device complexity
If existing lockup clutch control methods are applied to all transition scenarios, then the device complexity is reduced, but the adaptability to different operating conditions deteriorates
Solution Approach 1:
The control system uses a universal comparison mechanism that works for all transition scenarios (accelerator ON to OFF, and accelerator OFF to ON). By making the control logic universal rather than scenario-specific, the system maintains low complexity while achieving high adaptability to different operating conditions.
Solution Approach 2:
The system adapts to different operating conditions by dynamically changing the target clutch torque capacity parameter based on accelerator state transitions. The same comparison-based control logic handles all scenarios, providing both simplicity and adaptability through parameter adjustment rather than complex scenario-specific logic.
Data Source
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AI summary
A control apparatus for a lockup clutch is provided. The control apparatus for the lockup clutch includes an electronic control unit that is configured to: calculate a driven target clutch torque capacity and a driving target clutch torque capacity; set a target clutch torque of the lockup clutch and control the lockup clutch, based on the driven target clutch torque capacity and the driving target clutch torque capacity; and change over the target clutch torque capacity from the driven target clutch torque capacity to the driving target clutch torque capacity when the driven target clutch torque capacity and the driving target clutch torque capacity coincide with each other after an operation state of an accelerator of the vehicle changes over from an accelerator OFF state to an accelerator ON state.