Jet Watercraft Reverse Gate Position Error Correction
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Solution Overview
Problem
Existing jet propelled watercrafts face issues where the reverse gate position becomes unmatched with the control position due to obstacles or external forces, leading to malfunction detection challenges, especially when the reverse gate moving mechanism is normal, and there is no mechanical coupling between the reverse gate operator and the gate, making it difficult to notice such mismatches.
Innovation Solution
A jet propelled watercraft equipped with a reverse gate position detector and a controller that executes shift control to set a target shift position, moves the reverse gate to that position, and performs error judgment by comparing the detected position with the control position, stopping the reverse gate movement and reversing its direction if an error is detected, and preventing further movement until the error is resolved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reverse gate is moved by an actuator without mechanical coupling to the operator, then the control precision is improved, but the ease of detecting position mismatch deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring the reverse gate position through a position detector and comparing it with the control position from the operator. When a mismatch is detected, the system provides feedback to the operator via display or alarm, enabling timely correction of the position error.
2Reliability
If the reverse gate position detector is added to monitor position continuously, then the reliability of position matching is improved, but the device complexity increases
Solution Approach 1:
The system replaces complex mechanical position indication mechanisms with an electronic position detector and controller. The detector uses sensors or encoders to electronically sense the gate position, and the controller processes this information to determine mismatch conditions, simplifying the overall system architecture while improving reliability.
3Object-affected harmful factors
If the controller automatically reverses the reverse gate when error is detected, then the safety is improved, but the ease of operation deteriorates due to automatic intervention
Solution Approach 1:
The system applies preliminary anti-action by detecting position mismatches before they can cause harmful effects. When a mismatch is detected, the controller automatically reverses the reverse gate to the correct position, preventing potential damage to obstacles or the watercraft before the operator becomes aware of the error.
Data Source
AI summary
A jet propelled watercraft includes a prime mover, a jet pump driven by the prime mover and jetting water from a jet port, a reverse gate changing a direction of the jet flow jetted from the jet pump, a shift actuator switching a position of the reverse gate among a plurality of shift positions, a reverse gate position detector detecting the position of the reverse gate, and a controller configured or programmed to execute a shift control of setting a target shift position of the reverse gate and controlling the shift actuator to move the reverse gate to the target shift position and execute an error judgment of judging that an error has occurred when the position detected by the reverse gate position detector differs from a control position.