Driving-force Control Device for Saddle-ride Vehicles
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Solution Overview
Problem
Existing driving-force control devices for saddle-ride type vehicles experience a time lag in detecting a lifted front wheel, leading to excessive suppression of driving force during lift control, which deteriorates drivability and acceleration performance.
Innovation Solution
A driving-force control device with a control unit that executes first control to suppress driving force when a front wheel is lifted and second control to temporarily change driving force by releasing or weakening engagement of dogs in the dog-type transmission, allowing gear shift, with the control unit setting a target rear wheel torque based on calculated values from both controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lift control is executed to suppress driving force when front wheel is lifted, then front wheel lift is canceled, but acceleration performance deteriorates due to excessive suppression
Solution Approach 1:
The control unit detects a shift operation in advance and executes second control (temporarily changing driving force) before the front wheel actually lifts. This preliminary action prevents the need for excessive suppression later, as the driving force is already adjusted in anticipation of the lift condition.
Solution Approach 2:
The control unit dynamically switches between first control (suppress driving force) and second control (temporarily change driving force) based on real-time detection of front wheel lift state and shift operations. This dynamic adjustment optimizes acceleration performance while maintaining lift cancellation capability.
2Ease of operation
If shift control is executed to suppress driving force for gear shift, then dogs can be separated, but driving force is excessively suppressed when combined with lift control
Solution Approach 1:
The control unit merges first control (for lift cancellation) and second control (for gear shift) into a unified control strategy. When both conditions are detected, the control unit sets target rear wheel torque based on calculated values from both controls, combining their effects to achieve both lift cancellation and smooth gear shift without excessive suppression.
Solution Approach 2:
The control unit changes the parameter of target rear wheel torque dynamically by selecting between calculated values from first control and second control. This parameter adjustment allows the system to balance between suppressing driving force for gear shift and maintaining sufficient power for acceleration.
3Measurement precision
If detection of front wheel lift is used, then lift state can be detected, but time lag occurs between actual lift and detection
Solution Approach 1:
The control unit performs preliminary detection of shift operations and proactively executes second control before the front wheel actually lifts. This preliminary action eliminates the time lag problem by anticipating the lift condition rather than reacting to it after detection.
Solution Approach 2:
The control unit applies beforehand cushioning by temporarily changing driving force in advance of the actual lift event. This cushioning action prepares the system for the upcoming lift condition, preventing the time lag from causing excessive suppression or drivability deterioration.
Data Source
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AI summary
A driving-force control device executes lift control to suppress a driving force of an engine when it is judged that a front wheel is in a lifted state, and shift control to temporarily change the driving force by releasing or weakening engagement of dogs of a dog-type transmission so that gear shift of the dog-type transmission becomes possible, when a shift operation of the dog-type transmission is detected in a state in which connection of a main clutch is being detected. When it is judged that the front wheel is in a lifted state while the shift control is executed, by the lift control, the driving-force control device suppresses the driving force more than the driving force at the time of starting the shift control.