Electromagnetic Pump Actuator Noise Reduction via Magnetic Energy Dissipation
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Solution Overview
Problem
Existing pumps used in SCR systems for urea-water solution delivery in vehicles generate excessive noise due to increased pumping capacity, which is undesirable.
Innovation Solution
An electromagnetic linear actuator-based pump with a flexible membrane is used, where the magnetic energy is actively dissipated during movement with the spring force to enhance speed and reduce noise, allowing for increased delivery capacity without excessive noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pumping capacity of the pump is increased to improve delivery efficiency, then the delivery capacity is improved, but the noise level increases excessively
Solution Approach 1:
The pump operates with periodic actuation of the electromagnetic linear actuator, creating rhythmic pumping cycles. This periodic action allows the system to achieve high delivery capacity through increased pumping frequency while maintaining lower instantaneous noise levels, as the noise is distributed over time rather than continuous high-level noise
Solution Approach 2:
The system dynamically adjusts the actuation parameters of the electromagnetic linear actuator to optimize the balance between delivery capacity and noise generation. By dynamically controlling the pumping cycle timing and intensity, the system can adapt to different operational requirements while managing noise levels
2Productivity
If the electromagnetic linear actuator moves faster to increase delivery capacity, then the productivity is improved, but the noise generated during movement increases
Solution Approach 1:
The electromagnetic linear actuator is actuated in periodic cycles with optimized timing. By controlling the duration and frequency of voltage application, the system achieves fast overall pumping speed while allowing brief periods of lower-speed movement, reducing the noise generated during actuator movement
Solution Approach 2:
The system applies voltage to the electromagnetic linear actuator in predetermined time intervals that are optimized to achieve the desired movement speed while minimizing noise. The control strategy preliminarily determines the optimal actuation timing to balance speed and noise considerations
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
The pump achieves faster movement and increased delivery capacity while minimizing noise, ensuring efficient operation and reduced noise levels.
Implementation Method 1
an electromagnetic linear actuator that is acted upon by spring force and that can be moved or actuated by applying a voltage against the spring force
Implementation Method 2
an electromagnetic linear actuator that is acted upon by spring force
Implementation Method 3
The pump chamber is closed on one side with a flexible membrane, with the electromagnetic linear actuator being connected to the pump chamber or the membrane in such a way that the membrane is moved when the linear actuator moves
Implementation Method 4
A movement of the electromagnetic linear actuator in a first direction sucks fluid through a connection into the pump chamber and a movement of the electromagnetic linear actuator in a second direction—then opposite to the first direction—forces fluid through a connection out of the pump chamber
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a method for operating a pump (200) with a pump chamber (210) having at least one port (211, 212) and an electromagnetic linear actuator (220) acted upon by a spring force (FF), which is movable by applying a voltage (U) against the spring force (FF), wherein, by a movement of the electromagnetic linear actuator (220) in a first direction (R1), fluid is drawn into the pump chamber (210) through a port (211), wherein, by a movement of the electromagnetic linear actuator (220) in a second direction (R2), fluid is displaced from the pump chamber (210) through a port (212), and wherein, during a movement of the electromagnetic linear actuator (220) in the direction of the spring force (FF), a voltage (U) is applied at least temporarily such that a magnetic energy present in the electromagnetic linear actuator (220) is at least partially actively dissipated, as well as a system with such a pump. (200).