Boat Engine Idle Speed Control via Dynamic Feedback Gain
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Solution Overview
Problem
Existing boat engine idling revolution number control devices face challenges in maintaining stability and responsiveness during deceleration and reverse operations, often leading to engine stalls due to varying propeller loads and boat speeds, especially in small boats where cost-effective solutions are needed.
Innovation Solution
A boat engine idling revolution number control device and method that includes sensors for detecting engine revolution number, temperature, idling state, and shift position, using simulated boat-speed calculations and torque-rate adjustments to stabilize the engine revolution number, incorporating a running-load correction mechanism to prevent engine stalls and maintain target torque rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If revolution number feedback control is implemented during deceleration operation, then engine revolution number stability is improved, but engine stall occurs due to excessive air amount reduction
Solution Approach 1:
The control device dynamically adjusts the feedback gain based on the detected operation state. During deceleration operation, the feedback gain is reduced to prevent excessive air amount reduction that would cause engine stall. During normal idling operation, the feedback gain is increased to achieve stable revolution number control. This dynamic adjustment of control parameters resolves the contradiction between stability and reliability.
Solution Approach 2:
The system changes the feedback gain parameter according to operating conditions. By detecting whether the boat is in deceleration operation or normal operation, the control device modifies the feedback gain value accordingly. This parameter change allows the system to maintain both stability during normal operation and prevent engine stall during deceleration.
2Speed
If feedback control gain is increased to improve responsiveness, then engine revolution number convergence is improved, but engine stall occurs during deceleration due to propeller drive
Solution Approach 1:
The control device dynamically adjusts the feedback gain based on the detected operation state. During deceleration operation, the feedback gain is reduced to prevent excessive air amount reduction that would cause engine stall. During normal idling operation, the feedback gain is increased to achieve stable revolution number control. This dynamic adjustment of control parameters resolves the contradiction between stability and reliability.
Solution Approach 2:
The control device detects the operation state in advance and adjusts the feedback gain before it causes engine stall. By monitoring the boat speed and shift position, the system identifies deceleration operation conditions and preemptively reduces the feedback gain to prevent engine stall before it occurs.
3Measurement precision
If air amount is reduced to maintain target revolution number during deceleration, then revolution number control precision is improved, but engine stall occurs due to insufficient air amount
Solution Approach 1:
The control device dynamically adjusts the feedback gain based on the detected operation state. During deceleration operation, the feedback gain is reduced to prevent excessive air amount reduction that would cause engine stall. During normal idling operation, the feedback gain is increased to achieve stable revolution number control. This dynamic adjustment of control parameters resolves the contradiction between stability and reliability.
Solution Approach 2:
The control device applies different control strategies for different operation conditions. During deceleration operation, the system uses a reduced feedback gain to maintain sufficient air amount. During normal operation, the system uses a higher feedback gain for precise control. This localized adaptation of control quality to specific operating conditions resolves the contradiction.
4Force
If propeller load is increased during reverse operation, then boat propulsion capability is improved, but engine stall occurs due to unbalanced torque
Solution Approach 1:
The control device detects the operation state in advance and adjusts the feedback gain before it causes engine stall. By monitoring the boat speed and shift position, the system identifies deceleration operation conditions and preemptively reduces the feedback gain to prevent engine stall before it occurs.
Solution Approach 2:
The system changes the feedback gain parameter according to operating conditions. By detecting whether the boat is in deceleration operation or normal operation, the control device modifies the feedback gain value accordingly. This parameter change allows the system to maintain both stability during normal operation and prevent engine stall during deceleration.
Data Source
AI summary
Provided is a boat engine idling revolution number control device, which includes a control unit (30) for performing control so that an engine revolution number converges to a target revolution number based on a result of detection of an engine state. The control unit includes: a decelerating running determining section (314); and a running-load correction calculating function section (315) for calculating a running-load correction signal for correcting a basic torque rate based on the result of determination by the decelerating running determining section and a shift position state detected by the neutral switch. The running-load correction calculating function section resets the running-load correction signal to zero when detecting, based on a behavior of the engine revolution number after the running-load correction, that the engine revolution number is larger than a threshold value calculated based on the target revolution number and the engine revolution number increases.