Rear Wheel Slip Control for Motorcycle Stability Under Oscillation
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Solution Overview
Problem
Straddle-type vehicles, such as motorcycles, experience unstable rear wheel behavior due to excessive oscillation during slipping, which existing stabilization techniques fail to adequately address.
Innovation Solution
A controller that determines the stability of the rear wheel based on slip angle and executes first stabilization control by reducing the allowable slip amount when instability is detected, thereby minimizing rear wheel oscillation and stabilizing the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the allowable slip amount is reduced to stabilize rear wheel behavior, then rear wheel stability is improved, but the control system complexity increases
Solution Approach 1:
The patent applies dynamics by making the allowable slip amount variable rather than fixed. The control ECU dynamically adjusts the allowable slip amount based on detected riding states (acceleration, deceleration, cornering, etc.), allowing the system to adapt to different operating conditions. This resolves the contradiction by enabling stability improvement through dynamic parameter adjustment without requiring overly complex static control structures.
Solution Approach 2:
The patent changes the parameter of allowable slip amount based on different riding states. By detecting acceleration, deceleration, cornering status, and other parameters, the system adjusts the allowable slip amount threshold accordingly. This parameter change approach allows the system to maintain rear wheel stability across various operating conditions while using a relatively simple control structure that monitors and adjusts based on predefined states.
2Stability of the object's composition
If the allowable slip amount is reduced to cancel slip state, then rear wheel oscillation is suppressed, but the response time for stabilization increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple riding states (acceleration, deceleration, cornering, straight travel, etc.) and their corresponding allowable slip amount thresholds before actual operation. When the control ECU detects the current riding state, it can immediately apply the pre-determined appropriate slip amount without calculation delay. This resolves the contradiction by preparing stabilization parameters in advance, enabling rapid response when rear wheel oscillation occurs.
Solution Approach 2:
The patent implements feedback by continuously monitoring rear wheel slip angle and comparing it against the allowable slip amount threshold. When the slip angle exceeds the threshold, the system activates stabilization control to reduce the slip amount. This closed-loop feedback mechanism ensures rapid detection and response to unstable conditions, suppressing oscillation quickly while maintaining appropriate response time through continuous monitoring and immediate corrective action.
Data Source
AI summary
A controller and a control method capable of appropriately stabilizing behavior of a rear wheel of a straddle-type vehicle. In the controller and the control method, a slip amount of a wheel of a straddle-type vehicle is controlled to be equal to or smaller than an allowable slip amount. In the case where it is determined that behavior of a rear wheel of the straddle-type vehicle is in an unstable state on the basis of a slip angle of the straddle-type vehicle, stabilization control is executed to reduce the allowable slip amount of the rear wheel to be smaller than the allowable slip amount of the rear wheel at the time when it is determined that the behavior of the rear wheel is in the stable state.