Wheelie Suppression Control With Pre-Wheelie Output Rate Limiting
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Solution Overview
Problem
Existing wheelie suppression control systems fail to effectively prevent the occurrence of wheelie states in vehicles, often leading to delayed resolution or erroneous determinations, and can cause unexpected behaviors due to untimely execution of output reducing controls.
Innovation Solution
A wheelie suppressing control unit that includes a first determiner for identifying a wheelie state and a second determiner for detecting a pre-wheelie state, with a controller that executes distinct controls to prevent abrupt output changes and forestall wheelie states by restricting the rate of output change based on operation inputs and vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the conditions for determining wheelie state are relaxed to enable quick detection, then the response time is improved, but the likelihood of erroneous determination increases
Solution Approach 1:
The patent segments the wheelie detection process into two distinct determination stages: a first determiner that identifies when the vehicle has entered a wheelie state, and a second determiner that predicts whether the vehicle will enter a wheelie state in the future. This segmentation allows each determiner to use different criteria and thresholds optimized for their specific function, enabling quick detection without increasing erroneous determinations.
Solution Approach 2:
The second determiner performs preliminary action by predicting future wheelie state entry before it actually occurs. It uses current vehicle state information to forecast potential wheelie conditions and triggers output reducing control in advance, preventing the wheelie state from developing while maintaining accurate detection standards.
2Reliability
If output reducing control is executed early to prevent wheelie state, then the wheelie suppression effectiveness is improved, but the vehicle may exhibit unexpected behaviors when wheelie does not occur
Solution Approach 1:
The patent applies preliminary anti-action through the second determiner, which predicts potential wheelie states and triggers output reducing control before the wheelie actually occurs. This predictive approach allows the system to apply countermeasures in advance while maintaining the ability to distinguish between genuine wheelie risks and normal acceleration, thereby preventing unexpected vehicle behaviors.
Solution Approach 2:
The control system incorporates feedback mechanisms that continuously monitor vehicle state parameters and adjust control actions accordingly. The feedback loop ensures that output reducing control is applied only when the second determiner predicts a high probability of wheelie entry, and is discontinued when the prediction becomes unnecessary, maintaining predictable vehicle behavior while ensuring effective wheelie suppression.
3Reliability
If the output reducing control is applied to forestall wheelie state, then the wheelie prevention is improved, but the vehicle acceleration performance deteriorates
Solution Approach 1:
The patent applies partial action by using output reducing control selectively rather than continuously. The second determiner evaluates multiple vehicle state parameters and only triggers output reducing control when the predicted probability of wheelie entry exceeds a threshold. This partial application of control maintains acceleration performance during normal operation while providing sufficient suppression when needed.
Solution Approach 2:
The control system dynamically adjusts the output reducing control magnitude based on real-time vehicle state and prediction confidence. Rather than applying a fixed reduction, the system modulates the control strength according to the current situation, allowing maximum acceleration performance when wheelie risk is low and providing stronger suppression only when necessary, thus balancing prevention effectiveness with performance maintenance.
Data Source
AI summary
A wheelie suppressing control unit includes: a first determiner that determines whether a vehicle is in a traveling state satisfying a first condition representing a wheelie state; a second determiner that determines whether the vehicle is in a traveling state satisfying a second condition representing a pre-wheelie state which is a state preceding the wheelie state; and a controller that controls the vehicle based on an operation input. If the first determiner determines that the first condition is satisfied, the controller executes first control that reduces the output of a drive source of the vehicle. If the first determiner determines that the first condition is not satisfied and the second determiner determines that the second condition is satisfied, the controller executes second control that restricts a rate of change of the output with respect to the operation input provided to an operation member.