Lean Vehicle Cruise Control Switching at Low-Speed Stability Limit
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Solution Overview
Problem
Lean vehicles, such as motorcycles, are prone to instability when cruise control is applied due to their inability to maintain an upright posture at low speeds, potentially leading to falls.
Innovation Solution
A controller that switches from cruise control based on positional relationship information to a speed maintenance or automatic stop operation when the vehicle approaches a reference speed, preventing excessive deceleration and maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cruise control is applied to lean vehicle based on positional relationship information with preceding vehicle, then inter-vehicular distance can be secured safely, but lean vehicle speed may be excessively reduced causing posture instability and falling over
Solution Approach 1:
The control execution section changes the control parameters based on vehicle speed conditions. When speed is above reference speed, it executes first control (maintaining inter-vehicular distance). When speed reaches reference speed, it switches to second control (maintaining speed at reference level). This parameter-based switching resolves the contradiction by adapting the control strategy to current speed conditions.
Solution Approach 2:
The system dynamically switches between two different control operations based on real-time speed feedback. The first operation prioritizes inter-vehicular distance maintenance, while the second operation prioritizes speed maintenance. This dynamic adaptation allows the system to respond to changing conditions and prevent posture instability while maintaining safety.
2Object-affected harmful factors
If cruise control reduces speed to maintain safe distance from preceding vehicle, then collision risk is reduced, but lean vehicle becomes unstable and may fall over
Solution Approach 1:
The system changes control parameters based on speed thresholds. Above reference speed, the system allows speed reduction for safety. At reference speed, it switches to preventing further reduction. This resolves the contradiction by defining clear parameter boundaries for when each control strategy applies.
Solution Approach 2:
The control execution section continuously monitors vehicle speed and uses this feedback to determine which control operation to execute. When speed reaches the reference speed, the feedback triggers a switch to the second operation that prevents further deceleration. This feedback mechanism prevents posture instability while maintaining collision avoidance.
3Reliability
If lean vehicle executes cruise control to secure inter-vehicular distance, then safety against collision is improved, but excessive speed reduction causes the vehicle to fall over
Solution Approach 1:
The system dynamically adjusts its control behavior based on speed conditions. The first operation dynamically reduces speed to maintain distance, while the second operation dynamically maintains speed at the reference level. This dynamic switching resolves the contradiction between collision avoidance and minimum speed maintenance.
Solution Approach 2:
The control parameters are changed based on speed thresholds. The system transitions from a distance-priority parameter set to a speed-priority parameter set when the reference speed is reached. This parameter switching ensures both collision avoidance and minimum speed maintenance.
Data Source
AI summary
The present disclosure obtains a controller and a control method capable of improving safety of a lean vehicle.In a controller (30) and a control method according to the present disclosure, an execution section of the controller (30) executes a first operation as an operation that causes a lean vehicle (1) to execute a cruise control based on a positional relationship information between the lean vehicle (1) and a preceding vehicle preceding the lean vehicle (1). When a speed information, which is information about a speed of the lean vehicle (1) and is acquired during the first operation, indicates that the lean vehicle (1) is decelerated to a reference speed, the execution section executes, instead of the first operation, a second operation as an operation that causes the lean vehicle (1) to execute the cruise control regardless of the positional relationship information.