Vehicle Wheelie Detection Using Front Wheel Speed Sensor
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Solution Overview
Problem
Conventional control systems in rear-wheel-drive vehicles, such as motorcycles, face challenges in accurately detecting wheelies due to noise in acceleration sensor readings from vehicle vibrations and road surface irregularities, leading to ineffective suppression of engine driving power.
Innovation Solution
A control system utilizing a front wheel speed sensor to detect rotational speed, calculate change values, and determine wheelie conditions, thereby reducing noise interference and improving accuracy in detecting wheelies and suppressing engine power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an acceleration sensor is used to detect wheelie conditions, then the system can detect gravitational force changes during wheelies, but the detection accuracy deteriorates due to noise from vehicle vibrations and road surface irregularities
Solution Approach 1:
The patent extracts the useful signal (gravitational force component) from the noisy acceleration sensor output by comparing it with a reference signal from a non-wheelie state. This separation allows the system to isolate the wheelie-related acceleration changes from the harmful vibrations and road surface noise.
Solution Approach 2:
The system uses feedback by continuously monitoring the acceleration sensor output and comparing it with predetermined thresholds and reference values. The control unit adjusts the driving power suppression based on the detected wheelie state, creating a closed-loop control system that responds to actual vehicle conditions.
2Stability of the object's composition
If the control system suppresses engine driving power during detected wheelies, then vehicle stability improves, but the suppression may be ineffective or premature due to inaccurate detection
Solution Approach 1:
The system performs preliminary detection and comparison of acceleration signals before triggering power suppression. By establishing reference values during normal driving and comparing real-time signals against these references, the system ensures accurate wheelie detection before taking corrective action, preventing premature or incorrect suppression.
Solution Approach 2:
The control system dynamically changes the driving power parameter based on the detected wheelie state. When a wheelie is detected, the system modifies the engine output parameter to reduce power transmission to the rear wheel, thereby stabilizing the vehicle. The suppression level can be adjusted based on the severity and duration of the detected wheelie condition.
Data Source
AI summary
A control system in a vehicle including a front wheel which is a driven wheel and a rear wheel which is a drive wheel, the control system including: a control unit configured to control a driving power generated in a driving source according to a driving state of the vehicle; and a front wheel speed sensor configured to detect a rotational speed of the front wheel; the control unit including: a wheelie determiner configured to determine whether or not a predetermined wheelie starting condition is met, based on a value detected by the front wheel speed sensor; and a driving power controller configured to suppress the driving power if the wheelie determiner determines that the predetermined wheelie starting condition is met.