High-Pressure Pump Metering Valve Noise Reduction
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Solution Overview
Problem
The high-pressure pump in fuel supply systems for internal combustion engines generates operating sounds due to the movement of the metering valve, which can cause discomfort to occupants, and existing solutions struggle to effectively reduce noise while adhering to hardware restrictions on coil energization periods.
Innovation Solution
A control device that adjusts the energization of the electromagnetic unit to slow down the valve body's movement, implementing various sound reduction measures such as valve closing control, energization off delay control, and re-energization control, while ensuring the coil energization period does not exceed a predetermined upper limit, thereby reducing operating sounds during both valve closing and opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the coil energization period is extended to slow down valve body movement and reduce operating sound, then the noise reduction effect is improved, but the hardware restriction on coil energization period is violated
Solution Approach 1:
The coil energization period is divided into multiple separate energization intervals. Instead of continuous energization, the control device applies voltage in segmented pulses during the valve body's movement from open to closed position, allowing the total energization duration to remain within hardware limits while still achieving sufficient deceleration for noise reduction
Solution Approach 2:
The control device employs periodic energization pulses rather than continuous energization. By applying voltage in periodic intervals synchronized with the valve body's movement phases, the system achieves cumulative deceleration effect while keeping the duty cycle within acceptable limits, thus reducing operating sound without violating hardware restrictions
2Object-affected harmful factors
If the valve body movement is slowed down to reduce operating sound, then the noise level is reduced, but the fuel discharge amount control precision may be affected
Solution Approach 1:
The control device incorporates feedback mechanisms to monitor the valve body's position and movement speed. By detecting the actual state of the valve body and adjusting the energization timing and duration accordingly, the system maintains precise control over fuel discharge amount while implementing noise reduction through controlled deceleration
Solution Approach 2:
The control device dynamically adjusts the energization parameters based on the valve body's real-time position and speed. By varying the energization intensity and timing according to the movement phase, the system achieves optimal balance between noise reduction and control precision, slowing down the valve body only when necessary for noise reduction
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 solution effectively reduces the operating sound of the high-pressure pump throughout its opening and closing cycle, even when the coil energization period is restricted, making the noise less noticeable and ensuring hardware protection.
Implementation Method 1
a metering valve that includes a valve body located in a fuel inlet passage communicable with the pressurizing chamber and is configured to switch between energization and de-energization of an electromagnetic unit to move the valve body
Data Source
AI summary
A metering valve supplies fuel to and block fuel from a pressurizing chamber by moving a valve body by switching between energization and de-energization of an electromagnetic unit. An energization control unit performs a valve closing control and a valve opening control to reduce operating sound in one opening and closing period in which the valve body opens and closes. A time control unit controls, on determination that the energizing period of the electromagnetic unit exceeds the upper limit value, a moving speed of the valve body when the valve body moves to a valve closing side, such that the energization period of the electromagnetic unit in the one opening and closing period does not exceed the upper limit value, thereby to cause the energization control unit to perform both the valve closing control and the valve opening control in the one opening and closing period.