Wheelie Suppression via Dual Engine Output Control
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Solution Overview
Problem
Existing wheelie suppression technologies face challenges in quickly and effectively reducing engine output during a wheelie event without degrading the driving experience, as ignition retard control is limited in reducing engine output and throttle valve control is slow to respond.
Innovation Solution
A wheelie suppressing device that employs a dual control mechanism: a first suppressing control through fuel feeding and ignition operation, and a second suppressing control by reducing the rate of fuel feeding or ignition, allowing for rapid engine output reduction while maintaining a good driving feel by adjusting the extent of each control based on the wheelie state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If ignition retard control is used to suppress wheelie, then engine output is reduced, but the reduction amount is limited and response is slow
Solution Approach 1:
The wheelie suppressing control is divided into two distinct control modes: first suppressing control (fuel feeding and ignition operation) and second suppressing control (reduced rate fuel feeding or ignition operation). This segmentation allows each control mode to be optimized for specific functions - one for rapid response and one for fine adjustment, resolving the contradiction between response speed and control precision.
Solution Approach 2:
The control system dynamically switches between first suppressing control and second suppressing control based on the wheelie state. The wheelie suppressing section determines which control mode to apply, enabling the system to adapt its response characteristics in real-time - using second suppressing control for rapid initial suppression and first suppressing control for sustained precise control.
2Power
If throttle valve opening degree is reduced to suppress wheelie, then engine output is reduced, but the response is slow due to throttle valve responsivity
Solution Approach 1:
The invention extracts the throttle valve from the wheelie suppression control loop by implementing fuel feeding control and ignition operation control instead. This removes the mechanical inertia and slow responsivity of the throttle valve, enabling rapid engine output reduction through direct control of combustion parameters.
3Speed
If second suppressing control is increased to rapidly reduce engine output, then wheelie is suppressed quickly, but combustion state is transmitted to rider and driving feeling is degraded
Solution Approach 1:
The second suppressing control applies reduced rate fuel feeding or ignition operation at a controlled extent rather than fully cutting off combustion. This partial action achieves rapid engine output reduction sufficient to suppress wheelie while maintaining enough combustion to avoid transmitting harsh vibrations to the rider, thus preserving driving feeling.
Solution Approach 2:
The control system dynamically adjusts the extent of second suppressing control based on the wheelie state severity. The wheelie suppressing section determines the appropriate level of suppression, enabling rapid response when needed while avoiding excessive suppression that would degrade driving feeling.
4Ease of operation
If first suppressing control is used to finely adjust engine output, then driving feeling is maintained, but response delay occurs
Solution Approach 1:
The second suppressing control acts as a preliminary action that rapidly reduces engine output at the onset of wheelie. This initial rapid suppression addresses the time delay issue, after which the first suppressing control takes over for fine adjustment and maintaining driving feeling, eliminating the need for the first control to act alone from the start.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick suppression of wheelies with minimal impact on the driving experience by compensating for response delays and adjusting engine output suppression to prevent excessive suppression and maintain smooth operation.
Implementation Method 1
fuel feeding
Implementation Method 2
ignition operation
Implementation Method 3
an air-fuel mixture is combusted
Data Source
AI summary
A wheelie suppressing device comprises a wheelie determiner section which detects a wheelie state; and a wheelie suppressing section which performs a wheelie suppressing control for suppressing an engine output when the wheelie determiner section has detected the wheelie state, wherein the wheelie suppressing control includes a first suppressing control for suppressing the engine output while performing fuel feeding and an ignition operation, and a second suppressing control for suppressing the engine output by performing the fuel feeding or the ignition operation at a reduced rate.