High-Pressure Pump Valve Noise Reduction via Adaptive Timing
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Solution Overview
Problem
High-pressure pumps in fuel supply systems for internal combustion engines face challenges in noise reduction control, leading to discomfort for occupants due to operating noise, and variations in responsiveness to valve closing commands result in insufficient fuel discharge during power reduction modes.
Innovation Solution
A high-pressure pump control unit that adjusts the energization start timing of the electromagnetic unit based on responsiveness parameters, reducing electric energy supply to minimize noise while ensuring consistent fuel discharge by accounting for individual differences in response characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the supply power to the electromagnetic unit is reduced to minimize collision noise, then the operating noise is reduced, but the responsiveness of the valve body to the closing command deteriorates, resulting in insufficient fuel discharge
Solution Approach 1:
The control unit determines a responsiveness parameter in advance by measuring the actual time for the valve body to move from the open position to the closed position when energized. This pre-acquired responsiveness data is then used to calculate and adjust the energization start timing, ensuring that even with reduced supply power, the valve body will close at the correct moment to maintain fuel discharge consistency while minimizing collision noise.
2Object-generated harmful factors
If the supply power to the electromagnetic unit is set to a valve closeable minimum value to reduce collision noise, then the moving speed of the valve body decreases and collision noise is reduced, but the fuel pressure controllability deteriorates due to insufficient fuel discharge
Solution Approach 1:
The system dynamically adjusts the energization start timing of the electromagnetic unit based on the acquired responsiveness parameter. By making the control timing adaptive rather than fixed, the system can use minimal supply power to reduce collision noise while still ensuring that the valve body closes at the appropriate time to maintain fuel pressure controllability, thus resolving the contradiction between noise reduction and power control effectiveness.
3Object-affected harmful factors
If the supply power to the electromagnetic unit is reduced to reduce operating noise, then the noise level decreases, but individual differences in responsiveness become more significant, leading to variations in fuel discharge amount
Solution Approach 1:
The control unit acquires the responsiveness parameter by actually measuring how long it takes for the valve body to close when energized. This feedback information about the specific pump's response characteristics is then used to calculate the optimal energization start timing. This feedback mechanism compensates for individual differences between pumps, ensuring consistent fuel discharge even when operating noise is reduced through lower supply power.
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 operating noise and maintains fuel discharge consistency even during low power control modes, enhancing fuel pressure controllability in the pressure accumulation pipe.
Implementation Method 1
a control valve that is disposed in the intake passage and displaces a valve body in an axial direction due to a power supply to an electromagnetic unit to cut off a supply of fuel to the pressurizing chamber
Data Source
AI summary
A high-pressure pump includes a plunger that varies a volume of a pressurizing chamber, and a control valve that controls supply of fuel into the pressurizing chamber through a first valve body. When a predetermined execution condition is satisfied, an ECU reduces power supplied to a coil more than that in a normal control to implement a noise reduction control for reducing an operating noise generated along with the driving of the valve body. During the noise reduction control, a responsiveness parameter indicating responsiveness from starting energization of the coil until the valve body is displaced to a valve closing position is acquired. An energization start timing in the noise reduction control is calculated based on the acquired responsiveness parameter after the parameter is acquired. As a result, a discharge amount control of the high-pressure pump can be appropriately implemented in the noise reduction control.