High Pressure Pump Control Device Sound Reduction
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Solution Overview
Problem
Existing high pressure pumps for internal-combustion engines generate operating sounds due to the opening and closing of the regulating valve, which can be uncomfortable for occupants, and extending the coil-energizing period to reduce these sounds is limited by hardware protection constraints.
Innovation Solution
A control device for the high pressure pump that includes multiple sound reducing parts operating at specific timings to extend the coil-energizing period within hardware limits, selectively operating these parts to maintain sound reduction effectiveness while preventing coil-energizing period exceedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the coil-energizing period is extended to reduce operating sounds, then sound reduction effectiveness is improved, but the coil-energizing period may exceed hardware protection limits
Solution Approach 1:
The sound reduction control is divided into multiple independent sound reducing parts, each corresponding to different valve operation timings (valve opening, valve closing, intermediate timing). This segmentation allows selective activation of only necessary sound reducing parts based on current operating conditions, preventing the total coil-energizing period from exceeding hardware limits while still achieving sound reduction at critical moments
Solution Approach 2:
Instead of continuously energizing the coil for the entire cycle, the system applies partial action by selectively energizing the coil only during specific intervals when sound reduction is most needed (e.g., during valve opening/closing events). This partial energizing approach achieves adequate sound reduction while keeping the total energizing duration within safe hardware limits
2Object-affected harmful factors
If multiple sound reducing parts are operated simultaneously, then sound reduction effectiveness is improved, but the coil-energizing period exceeds hardware protection limits
Solution Approach 1:
The control system dynamically determines which sound reducing parts to activate based on real-time operating conditions such as pump discharge amount, engine speed, and valve position. This dynamic selection ensures that sound reducing parts are operated only when necessary and in combinations that keep the total coil-energizing period within hardware protection limits, maintaining both sound reduction effectiveness and hardware reliability
3Object-affected harmful factors
If the coil is continuously energized to prevent sound, then operating sound is reduced, but energy consumption increases and hardware protection is compromised
Solution Approach 1:
Instead of continuous coil energizing, the system employs periodic action by activating the coil in discrete intervals corresponding to specific valve operation events (opening, closing, intermediate positions). This periodic energizing pattern reduces overall energy consumption while maintaining sound reduction effectiveness during the most critical noise-generating periods
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
Effectively reduces operating sounds from the high pressure pump within the constraints of hardware protection limits, ensuring the sound reducing control is maintained without overheating the coil drive circuit.
Implementation Method 1
When the coil is energized, the valve body is shifted to a valve-closing position by electromagnetic attraction force of the coil
Data Source
AI summary
A control device includes a plurality of sound reducing parts that is operated individually, when a predetermined condition for operation is met, at each of a plurality of timings when an operating sound is generated as a result of a movement of a valve body, in one open-and-close period, and that reduces the operating sound, at each of the plurality of the timings, by changing a period of energizing an electromagnetic part to an increase side relative to a normal time, an upper limit determination part that determines whether a required period of energizing the electromagnetic part in the one open-and-close period exceeds a predetermined upper limit value, when all the plurality of the sound reducing parts are operated, and a selectively operating part that selects and operates one or more of the plurality of the sound reducing parts to an extent that the required period of energizing does not exceed the upper limit value, when the upper limit determination part has determined that the required period of energizing exceeds the upper limit value.