Fuel Pump Control Apparatus for Engine Power Saving
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Solution Overview
Problem
Existing fuel pump control systems for small outboard motors face challenges in power saving due to excessive current consumption, inaccurate fuel supply, and temperature-induced drift, leading to inefficiencies and increased man-hours for adapting to different engine displacements.
Innovation Solution
A fuel pump control apparatus that optimally controls the driving duty of the fuel pump based on engine operation conditions, using a motorized fuel pump with a fuel pressure regulation function, a power generation portion, and a control unit that calculates fuel injection amounts and pump driving duty to match fuel consumption, allowing for feedback correction to stabilize motor speed and reduce wasteful energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control on fuel pump driving current is implemented to maintain target fuel pressure, then fuel supply accuracy is improved, but current consumption increases and power saving is compromised
Solution Approach 1:
The system pre-calculates the required fuel pump driving current based on engine load and rotation speed before actual fuel injection. By determining the necessary current in advance based on predicted fuel requirements, the system avoids excessive current consumption while maintaining accurate fuel supply, resolving the contradiction between precision and energy efficiency
2Speed
If driving current is temporarily increased to exceed target current value for faster response, then response speed is improved, but current consumption and self-generated voltage loss increase
Solution Approach 1:
Instead of temporarily exceeding target current with excessive action, the system calculates and applies the precise current level needed for the given engine conditions. By matching the driving current exactly to the required amount based on engine load and speed, the system achieves adequate response without the energy waste associated with excessive current application
3Device complexity
If unique map values are used to determine fuel pump driving duty, then device complexity is reduced, but adaptability to different engine conditions and part irregularities decreases
Solution Approach 1:
The system dynamically adjusts fuel pump driving duty by calculating required current based on real-time engine load and rotation speed conditions. This dynamic calculation approach replaces static unique map values, enabling the system to adapt to varying engine conditions and part irregularities while maintaining relatively simple device architecture through algorithmic flexibility
4Reliability
If larger driving amount is set for fuel pump to ensure sufficient fuel supply, then fuel supply reliability is improved, but power generator capacity requirements increase
Solution Approach 1:
The system optimizes fuel pump driving parameters by calculating the precise current required based on engine load and rotation speed. By adjusting the driving current parameter to match actual fuel需求的, the system ensures reliable fuel supply without requiring excessive power generator capacity, thus resolving the contradiction between reliability and power requirements
Data Source
AI summary
By driving a fuel pump suitably to an amount of fuel according to an amount of fuel consumed by an engine and by monitoring an actual motor speed of the fuel pump, F/B control is carried out according to a target motor speed and the actual motor speed of the fuel pump. Meanwhile, by learning and storing a duty value comparable to a deviation between the target and actual motor speeds, duty driving of the fuel pump is corrected to suit an engine condition. It thus becomes possible to provide a fuel pump control apparatus of an engine capable of promoting power saving by suppressing a wasteful energy loss including a current consumption and making an internal circuit of an ECU simpler by enhancing fuel supply accuracy.