High Pressure Pump Solenoid Control for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High pressure pumps in direct injection engines face challenges in reducing noise during valve-opening and valve-closing operations due to collisions between movable parts and stoppers, leading to vibrations and inefficient fuel pressure control, especially with variations in manufacturing and environmental conditions affecting the minimum current required for valve closure.
Innovation Solution
A control device for high pressure pumps that continuously passes current through the solenoid until fuel pressure decreases to hold the movable part at the closing position, then temporarily re-engages the current to control the electromagnetic attracting force, reducing noise and preventing collisions, while also implementing a slow valve-closing control by decreasing the rate of rise of the drive current to avoid faulty closures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the passage of current through the solenoid is stopped to move the movable part to the opening-side position, then the valve-opening control is achieved, but the movable part collides with the flow regulating valve causing vibrations and noises
Solution Approach 1:
The patent applies periodic action by temporarily re-applying current to the solenoid before the movable part reaches the opening-side position. This periodic current application creates electromagnetic attraction force that decelerates the movable part, preventing collision with the flow regulating valve and reducing vibrations and noises during valve-opening control
Solution Approach 2:
The patent uses feedback by monitoring the position of the movable part and the state of the flow regulating valve. Based on this feedback, the control device determines when to temporarily re-apply current to the solenoid, ensuring the movable part is decelerated at the appropriate moment to avoid collision while maintaining precise control
2Ease of operation
If the passage of current through the solenoid is stopped to open the flow regulating valve, then the valve opening is achieved, but the movable part hits the stopper causing vibrations and noises
Solution Approach 1:
The patent applies periodic action by temporarily re-applying current to the solenoid before the movable part reaches the opening-side position. This periodic current application creates electromagnetic attraction force that decelerates the movable part, preventing collision with the stopper and reducing vibrations and noises
Solution Approach 2:
The patent applies beforehand cushioning by using the temporary current application to create electromagnetic braking force that cushions the deceleration of the movable part before it reaches the opening-side position, preventing harsh impact with the stopper
3Speed
If the minimum current value is used to close the electromagnetic valve, then the valve closing speed is decreased, but faulty valve closing operation occurs due to current shortage
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the current value supplied to the solenoid based on the operating state. Instead of using a fixed minimum current value, the control device increases the current value when conditions require faster or more reliable valve closure, thereby maintaining both speed and reliability of the valve closing 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 effectively reduces noise and vibrations during valve operations by controlling the electromagnetic force and maintaining accurate valve closure, even with variations in manufacturing and environmental conditions, eliminating the need for fuel pressure corrections.
Implementation Method 1
an electromagnetic actuator (27) for moving the flow regulating valve (23)
Implementation Method 2
the passage of current through the solenoid (30) is controlled to thereby control a period during which the flow regulating valve (23) is closed
Data Source
AI summary
When a flow regulating valve is opened, the passage of current through a solenoid is stopped to move a movable part from a closing-side position to an opening-side position and to thereby open the flow regulating valve. When a sound reducing control performing condition is fulfilled, a valve-opening control for reducing sound is performed. In the valve-opening control, until a fuel pressure in a pump chamber is decreased and the flow regulating valve is opened, the passage of current through the solenoid is continuously performed to hold the movable part at the closing-side position. After the flow regulating valve is opened, the passage of current through the solenoid is stopped. Before the movable part reaches the opening-side position, the passage of current is again temporarily performed. An electromagnetic attracting force is temporarily generated and a moving speed of movable part is decreased by the attracting force.