Straddled Vehicle Front Wheel Lift Detection and Control
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Solution Overview
Problem
Conventional straddled vehicles, such as motorcycles and all-terrain vehicles, face instability due to front wheel lift during excessive driving force, as existing detection methods are often slow to detect and inefficient in reducing this lift, potentially leading to recurring instability.
Innovation Solution
A straddled vehicle equipped with a first detector for pitch rate and a second detector for front wheel rotation, a controller with a front wheel lift determination circuit that monitors these outputs to determine the occurrence of front wheel lift, and adjusts the driving force or braking to reduce and prevent lift, utilizing a 6-axis inertia measurement unit and ECU for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used to detect front wheel lift, then the detection system is simple, but the detection speed is slow and detection precision is insufficient
Solution Approach 1:
The patent combines multiple detection methods (pitch rate detection from inertia sensor and front wheel rotation detection) into a unified detection system. The controller integrates signals from both detection sources to comprehensively determine front wheel lift occurrence, achieving high detection precision through merged information from different sensing approaches.
Solution Approach 2:
The detection function is segmented into two independent detection channels: pitch rate detection via inertia sensor and front wheel rotation detection via rotation detector. Each channel operates independently to monitor different aspects of vehicle behavior, and their results are combined by the controller to achieve accurate front wheel lift detection.
2Stability of the object's composition
If driving force is reduced to eliminate front wheel lift, then front wheel lift is reduced, but the response time is delayed and stability is insufficient
Solution Approach 1:
The system performs preliminary detection of front wheel lift occurrence using pitch rate and front wheel rotation signals before the lift becomes severe. By detecting the incipient stage of front wheel lift early, the controller can initiate driving force reduction promptly, preventing the vehicle from entering an unstable state and maintaining running stability.
Solution Approach 2:
The controller continuously monitors pitch rate and front wheel rotation signals as feedback to determine front wheel lift occurrence. Based on this real-time feedback, the controller dynamically adjusts driving force to eliminate lift and maintain stability, creating a closed-loop control system that responds rapidly to changing vehicle states.
Data Source
AI summary
A straddled vehicle includes a front wheel, a rear wheel, an engine which generates a driving force and rotates the rear wheel with the driving force, a front wheel brake and a rear wheel brake which lowers the rotation speed of at least the rear wheel, a first detector which acquires and outputs a pitch rate, a second detector which detects and outputs information concerning rotation of the front wheel, and an ECU including a front wheel lift determination circuit which monitors respective outputs from the first detector and the second detector to determine whether a front wheel lift exists based on at least one of the pitch rate and information concerning rotation of the front wheel. When the front wheel lift exists, the ECU controls the driving source or the braking device so that the driving force is lowered or the rotation speed of the rear wheel is lowered.