Fuel Pump Pulse Frequency Control for Noise and Loss Reduction
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Solution Overview
Problem
Existing fuel pump control methods using pulse duration modulation lead to unwanted noise due to magnetostriction effects and high power losses in control electronics, which reduce service life.
Innovation Solution
The method involves controlling the frequency of pulse duration modulation in fuel pumps based on delivery rate, setting higher frequencies for low delivery rates to minimize noise and lower frequencies for high delivery rates to reduce switching losses, with integral controllers and temperature/current feedback for smooth transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pulse duration modulation is used to control fuel pump, then fuel delivery is controlled as a function of engine fuel requirement, but audible noise is generated due to magnetostriction effects and alternating forces on electrical conductors
Solution Approach 1:
The patent applies dynamics by making the pulse frequency adjustable rather than fixed. The control system dynamically adapts the pulse frequency based on operating conditions, switching between a first frequency (first operating state) and a second frequency (second operating state). This dynamic adjustment allows the system to maintain effective fuel pump control while avoiding audible noise by selecting appropriate frequencies for different operating conditions.
Solution Approach 2:
The patent applies parameter changes by varying the pulse frequency parameter. The system changes the frequency parameter between two distinct values (first frequency and second frequency) depending on the operating state. This parameter variation enables the system to eliminate audible noise by operating at frequencies outside the audible range or at frequencies where magnetostriction effects are minimized, while still maintaining effective fuel delivery control.
2Object-generated harmful factors
If high frequency pulse duration modulation is used to reduce audible noise, then noise is minimized, but power loss in control electronics increases due to higher switching losses
Solution Approach 1:
The patent applies dynamics by making the pulse frequency adjustable rather than fixed. The control system dynamically adapts the pulse frequency based on operating conditions, switching between a first frequency (first operating state) and a second frequency (second operating state). This dynamic adjustment allows the system to maintain effective fuel pump control while avoiding audible noise by selecting appropriate frequencies for different operating conditions.
Solution Approach 2:
The patent applies parameter changes by varying the pulse frequency parameter. The system changes the frequency parameter between two distinct values (first frequency and second frequency) depending on the operating state. This parameter variation enables the system to eliminate audible noise by operating at frequencies outside the audible range or at frequencies where magnetostriction effects are minimized, while still maintaining effective fuel delivery control.
3Object-generated harmful factors
If pulse frequency is increased to minimize magnetostriction effects and noise, then noise is reduced, but service life of control electronics decreases due to increased temperature from power loss
Solution Approach 1:
The patent applies dynamics by making the pulse frequency adjustable rather than fixed. The control system dynamically adapts the pulse frequency based on operating conditions, switching between a first frequency (first operating state) and a second frequency (second operating state). This dynamic adjustment allows the system to maintain effective fuel pump control while avoiding audible noise by selecting appropriate frequencies for different operating conditions.
Solution Approach 2:
The patent applies parameter changes by varying the pulse frequency parameter. The system changes the frequency parameter between two distinct values (first frequency and second frequency) depending on the operating state. This parameter variation enables the system to eliminate audible noise by operating at frequencies outside the audible range or at frequencies where magnetostriction effects are minimized, while still maintaining effective fuel delivery control.
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 approach effectively reduces audible noise during low fuel demand and minimizes power losses during high demand, enhancing the service life of control electronics and adapting to various fuel system power classes.
Implementation Method 1
electric motors are composed of magnetic or magnetically permeable material which can have magnetostriction effects
Implementation Method 2
they contain current-conducting electrical conductors in magnetic fields which experience a force which corresponds to electric current
Data Source
AI summary
In a method for operating a fuel pump in order to guide fuel from the fuel container of an internal combustion engine, the electric energy, which is in the form of pulses, is periodically guided to the fuel pump and the duration of the pulses is controlled according to the fuel required by the internal combustion engine. The frequency of the pulses is controlled in such a manner that, in the event of low pump rate of the fuel pump, the frequency is controlled to a higher level than in the even of a high pump rate.