Dosing Pump Voltage Profile for Noise and Energy Reduction
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Solution Overview
Problem
Dosing pumps are not tolerant of temperature changes, viscosity variations of the liquid being delivered, and changes in counterpressure, leading to inefficiencies and potential noise issues during operation.
Innovation Solution
The method involves generating an effective voltage profile with a first maximum in the starting phase and a second maximum in the end phase, allowing the piston to reach its end position efficiently even under varying conditions, while minimizing noise and energy requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the voltage applied to the drive unit is increased to move the piston faster, then the productivity is improved, but the use of energy increases and noise is generated
Solution Approach 1:
The patent applies periodic voltage pulses with varying amplitudes during different phases of the piston stroke. The voltage is applied periodically but with modulated amplitude - higher at the beginning of the stroke to accelerate the piston, and lower or zero near the end position to reduce energy consumption and noise while still achieving the desired productivity improvement.
2Reliability
If the voltage is increased to ensure the piston reaches the end position under varying conditions, then the reliability is improved, but the noise increases
Solution Approach 1:
The patent dynamically adjusts the voltage amplitude based on the piston's position and operating conditions. The voltage profile is not static but varies continuously during the stroke, being higher when needed to overcome varying loads and ensure reliable end-position achievement, and lower when the piston approaches the end position to minimize noise generation.
Solution Approach 2:
The patent changes the voltage parameter dynamically during operation. By monitoring operating conditions and piston position, the system adjusts the voltage amplitude and timing to maintain reliable piston movement to the end position while minimizing noise-generating high voltages to the extent possible.
3Adaptability or versatility
If the voltage amplitude is increased to compensate for temperature changes and viscosity variations, then the adaptability is improved, but the use of energy increases
Solution Approach 1:
The patent employs feedback mechanisms to monitor operating conditions such as temperature and viscosity variations. Based on this feedback, the control system dynamically adjusts the voltage amplitude applied to the drive unit, providing just enough additional voltage to compensate for adverse conditions without continuously applying high voltage that would waste energy during normal operation.
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 ensures the piston reaches its end position effectively across different temperatures, viscosities, and pressures without significant noise or increased energy consumption, making the dosing pump more adaptable and efficient.
Implementation Method 1
a drive unit which can be electrically excited by the application of a voltage
Data Source
AI summary
A method for operating a vehicle heater dosing pump for conveying fuel having a piston which can be moved back and forth between a start position and an end position, and a drive unit which can be electrically excited by applying a voltage, having the following procedure: controlling and/or regulating the voltage for generating an effective voltage to transfer the piston from the start position to the end position, wherein the effective voltage reaches a first maximum (U1) in a start phase (t0-t1), and is lower than the first maximum in a subsequent intermediate phase (t1-t2). The effective voltage reaches a second maximum (U3) in an end phase (t2-t3) following the intermediate phase. A device is also provided having a dosing pump and a control/regulation unit. The control/regulation unit is suitable for controlling voltage applied to a drive unit of the dosing pump.