Jet Ski Throttle Control for Turning Deceleration
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Solution Overview
Problem
Conventional jet-propulsion personal watercrafts face challenges in maintaining propulsion force during deceleration, especially when turning, leading to increased distance traveled before stopping, as the engine speed is not adequately controlled to balance steering and deceleration.
Innovation Solution
A jet-propulsion personal watercraft equipped with a pressure sensor system to detect lateral pressure changes, allowing a controller to determine if the watercraft is turning and adjust engine power output to maintain suitable propulsion force during deceleration, either by reducing the decrease in engine power or increasing it as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuator restricts the throttle valve closing operation before the engine speed reaches idling speed, then the propulsion force is maintained for effective steering, but the distance over which the watercraft moves until stopped increases
Solution Approach 1:
The patent applies dynamics by making the throttle valve closing operation dependent on the detected turning state. The control unit dynamically adjusts the throttle valve closing timing based on real-time pressure sensor feedback that detects whether the watercraft is turning. When turning is detected, the throttle valve is restricted from closing before reaching idling speed to maintain propulsion for effective steering. When not turning, the throttle valve closes normally to minimize stopping distance. This dynamic adjustment resolves the contradiction by adapting the system behavior to actual operational conditions.
Solution Approach 2:
The patent implements feedback through the pressure sensor that continuously monitors water pressure on the hull and provides signals to the control unit. This feedback mechanism enables the control unit to detect the turning state and adjust the throttle valve operation accordingly. The feedback loop ensures that the throttle valve closing timing is optimized based on real-time operational data, maintaining propulsion force when needed for steering while enabling quick deceleration when turning is not detected.
2Length of moving object
If the engine speed is quickly reduced during deceleration, then the stopping distance is minimized, but the propulsion force for turning becomes insufficient
Solution Approach 1:
The system dynamically adjusts engine speed reduction based on the detected turning state. When the pressure sensor detects turning, the control unit prevents rapid engine speed reduction by restricting the throttle valve from closing completely before reaching idling speed, thereby maintaining sufficient propulsion force for turning. When not turning, the system allows quick engine speed reduction to minimize stopping distance. This dynamic control strategy resolves the contradiction by adapting engine deceleration rates to actual steering needs.
Solution Approach 2:
The patent changes the throttle valve opening degree parameter based on the detected turning state. When turning is detected, the control unit maintains a larger throttle valve opening degree to preserve engine power output and propulsion force. When not turning, the throttle valve opening degree is reduced to enable quick deceleration. This parameter adjustment resolves the contradiction by optimizing engine power delivery according to operational requirements.
3Force
If the throttle valve is restricted from closing before reaching idling speed, then the engine speed is maintained for adequate propulsion, but the time to reach idling speed is extended
Solution Approach 1:
The system dynamically adjusts the throttle valve closing timing based on real-time pressure sensor feedback detecting turning state. When turning is detected, the throttle valve is restricted from closing before reaching idling speed to maintain adequate propulsion force for effective steering. When not turning, the throttle valve closes normally, reducing the time to reach idling speed. This dynamic adjustment resolves the contradiction by adapting the time-to-idling parameter to actual operational needs.
Solution Approach 2:
The pressure sensor provides continuous feedback on water pressure distribution, enabling the control unit to detect turning state and adjust throttle valve closing timing accordingly. This feedback mechanism allows the system to extend the time to reach idling speed only when turning is detected, while allowing faster deceleration when turning is not detected, thus resolving the time loss contradiction.
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
This solution effectively maintains propulsion force during turning in the deceleration state, reducing the distance traveled before stopping by dynamically controlling engine power output based on turning and deceleration states.
Implementation Method 1
a pressure sensor configured to be able to detect a pressure which is applied to the body from the water on which the body is floating, the pressure having a component in a lateral direction of the body
Implementation Method 2
an engine driving power output changing system configured to be able to change a driving power output of the engine... a water jet pump, which pressurizes and accelerates the water that is sucked from a water intake, which is generally provided on a hull bottom surface and ejects it rearward from an outlet port
Implementation Method 3
As the resulting reaction, the watercraft is propelled forward
Data Source
AI summary
A jet-propulsion personal watercraft comprises a body including a hull and a deck, an engine mounted in the body, a driving power output changing system configured to be able to change a driving power output of the engine, a controller configured to control an operation of the driving power output changing system, and a pressure sensor configured to be able to detect a pressure which is applied to the body from the water on which the body is floating, the pressure having a component in a lateral direction of the body, wherein the controller includes a turning determiner configured to determine whether or not the body is turning, based on a signal received from the pressure sensor; and a driving power output control unit configured to control the driving power output changing system based on information received from the turning determiner.