Adaptive Traction Control for Motorcycles Using Dynamic Slip Maps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing traction control systems for two-wheeled vehicles face challenges in maintaining stability and performance across varying driving conditions, often relying on conservative slip limits or imprecise feedback, leading to suboptimal traction and responsiveness.
Innovation Solution
A system and method that combines closed-loop and feedforward control using sensors to estimate instantaneous slip, adjust torque, and adapt to road conditions through a reference generator and mixing parameter, allowing for precise slip control and rapid response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conservative limit slip value is used to ensure stability, then vehicle stability is improved, but acceleration performance deteriorates
Solution Approach 1:
The patent applies dynamics by making the slip limit adaptive rather than fixed. The control unit dynamically adjusts the slip limit based on real-time vehicle conditions including lean angle, vehicle speed, and acceleration demands. This allows the system to maintain stability when needed while permitting higher slip values for improved acceleration when conditions allow, thus resolving the contradiction between stability and performance.
Solution Approach 2:
The patent changes the parameter of slip limit from a constant conservative value to a variable parameter that adapts to driving conditions. By modifying the slip limit parameter based on lean angle, speed, and torque demands, the system can optimize both stability and acceleration performance depending on the current operating state, eliminating the need to choose between the two opposing requirements.
2Device complexity
If slip estimation uses only wheel speed difference, then system complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent introduces an intermediary computational model that processes multiple sensor inputs (wheel speeds, vehicle speed, lean angle, torque demands) to estimate slip. Rather than directly using the simple wheel speed difference, the system uses these measurements as intermediaries to calculate a more accurate slip value that accounts for vehicle dynamics, thereby improving precision without requiring direct complex slip sensors.
Solution Approach 2:
The patent makes the existing sensor system multi-functional by using standard sensors (wheel speed sensors, accelerometers, lean angle sensors) for multiple purposes. These sensors not only monitor basic vehicle parameters but also serve as inputs for the sophisticated slip estimation algorithm, eliminating the need for dedicated complex slip measurement hardware while achieving high precision.
3Stability of the object's composition
If closed-loop control with feedback is used, then stability is improved, but response speed to reference variations deteriorates
Solution Approach 1:
The patent merges feedforward control and closed-loop feedback control into a unified control system. The feedforward component provides rapid initial response to torque demands by predicting required slip adjustments, while the feedback component ensures stability by continuously correcting based on actual slip measurements. This combination allows the system to respond quickly like open-loop control while maintaining the stability of closed-loop control.
Solution Approach 2:
The patent applies preliminary action through feedforward control that anticipates the required slip adjustment before the actual slip deviation occurs. By calculating the expected slip based on torque demands and vehicle state, the system can pre-adjust the torque delivery, achieving rapid response while the subsequent feedback ensures the action remains stable and accurate.
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
The present invention refers to a system and method for controlling traction in a two-wheeled vehicle (120) comprising a torque controlled motor (121) and a plurality of sensors (122) for instantaneously measuring driving parameters (v,ϕ,θ,ω,x,a,RPM,gear) of said vehicle (120), the method comprising the steps of determining a reference slip value (λ0) as a function of a parameter (θ) representative of a torque request from a user detected by means of the plurality of sensors (122); estimating an instantaneous slip value (λs); determining a first component (τCL) of a requested torque signal to the motor (121) based upon the difference between the reference slip value (λ0) and the instantaneous slip value (λS); and is characterised in that the reference slip value (λ0) is determined by means of a torque-slip map correlating the parameter (θ) representative of a torque request with a slip (λ), the map varying as a function of a longitudinal speed (v) and a rolling angle (ϕ) of the two-wheeled vehicle (120) detected by means of the plurality of sensors (122).