Personal Watercraft Turning Control with Engine and Nozzle Adjustment
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Solution Overview
Problem
Existing personal watercrafts face challenges in improving turning operability, particularly for beginners and in varying conditions, leading to instability and potential separation of passengers or luggage during turns.
Innovation Solution
A personal watercraft equipped with a turning attitude detection system that adjusts behavior through a control unit, reducing engine output and altering the jet nozzle's angle when specific angular thresholds are exceeded, stabilizing the turning attitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver performs turning operation on a personal watercraft, then the watercraft can change direction, but the turning attitude may deviate from reference causing instability and potential separation of passengers or luggage
Solution Approach 1:
The control unit continuously monitors the turning attitude through detection units (roll angle sensors, yaw rate sensors) and compares it against reference values. When deviation is detected, the system automatically adjusts engine output and nozzle angle to correct the attitude, creating a closed-loop feedback control system that maintains stability during turning operations
Solution Approach 2:
The system dynamically changes operational parameters (engine output power and jet nozzle injection angle) based on detected turning attitude. When roll angle or yaw rate exceeds thresholds, the control unit reduces engine output and adjusts nozzle angle to optimize the water jet direction, thereby stabilizing the watercraft's turning attitude without requiring manual intervention
2Stability of the object's composition
If the control unit reduces engine output during turning, then turning stability is improved, but the drive force available for turning is reduced
Solution Approach 1:
The system dynamically adjusts engine output and nozzle angle based on real-time turning attitude detection. Rather than maintaining fixed power levels, the control unit modulates engine power and jet direction to provide optimal balance between stability and turning effectiveness, recovering drive force when attitude stabilizes while preventing excessive deviation
3Stability of the object's composition
If a control system with turning attitude detection is added, then turning stability is improved, but the device complexity increases
Solution Approach 1:
The control unit integrates multiple functions including turning attitude detection, roll angle monitoring, yaw rate measurement, and dual control outputs (engine power and nozzle angle) into a single centralized control system. This multi-functional approach consolidates what could be separate complex subsystems into one coordinated unit, managing complexity through functional integration
Data Source
AI summary
A personal watercraft includes: a watercraft body; an operation unit operated by a driver aboard the watercraft body; a turning attitude detection unit that detects a turning attitude that is an attitude of the watercraft body when the driver performs operation of turning the watercraft body; a behavior adjustment actuator that adjusts behavior of the watercraft body; and a control unit that controls the behavior adjustment actuator based on the turning attitude detected by the turning attitude detection unit.