Spill Valve Control for Engine Noise Reduction
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Solution Overview
Problem
Existing control methods for reducing noise caused by electromagnetic spill valves in high-pressure pumps of internal combustion engines are complex and costly, requiring multiple sensors and sophisticated control systems.
Innovation Solution
A simplified control method that stops the closing operation of the spill valve when the engine is in intake passage injection mode and the fuel pressure is sufficient, reducing vibration and noise while maintaining high-pressure fuel injection capabilities, using a minimal set of sensors such as a cylinder pressure sensor and rotation speed sensor to adjust fuel pressure settings based on engine operation states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electromagnetic spill valve closing timing is delayed to reduce noise, then the noise from valve seating is reduced, but the fuel injection amount cannot be properly controlled and deposits accumulate in injectors
Solution Approach 1:
The harmful function of the electromagnetic spill valve (noise-generating closing operation) is extracted and eliminated by determining a noise generation period and stopping the closing operation during this period, while maintaining the necessary fuel injection control through alternative valve operation timing
Solution Approach 2:
The valve operation timing is made dynamic by adjusting the closing timing based on engine operating conditions (intake passage injection mode detection), allowing the system to optimize between noise reduction and injection control accuracy根据不同工况
2Object-affected harmful factors
If the closing operation of the spill valve is stopped to reduce noise, then vibration and noise are reduced, but the high-pressure fuel injection capability may be impaired
Solution Approach 1:
The system dynamically adjusts spill valve operation based on injection mode: in intake passage injection mode, closing operation is stopped during noise generation period; in other modes, normal operation is maintained to ensure high-pressure injection capability
Solution Approach 2:
The closing operation is periodically stopped during identified noise generation periods while maintaining fuel pressure above set values, creating a rhythmic operation pattern that reduces noise while preserving injection capability when needed
3Object-affected harmful factors
If complex control systems with multiple sensors are used to reduce noise, then noise reduction effectiveness is improved, but device complexity and cost increase
Solution Approach 1:
The control system uses existing sensor data (cylinder pressure, rotation speed) that the engine already monitors for other purposes, allowing noise reduction control without adding dedicated noise sensors or complex monitoring systems
Solution Approach 2:
The spill valve control system performs multiple functions: fuel injection control, pressure regulation, and noise reduction, all through the same valve operation mechanism, eliminating the need for separate noise control hardware
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 vibration from the spill valve operation while maintaining high-pressure fuel injection responsiveness, achieved through a cost-effective and simplified control system that can switch between intake passage and combination injection modes without impairing original functions.
Implementation Method 1
an electromagnetic spill vale that opens and closes a fuel inlet of the cylinder to control a discharge amount to be commensurate with the fuel injection amount of the in-cylinder injectors. This electromagnetic spill valve comprises a spring member for adding a spring force which biases a valve element to an open position, and a solenoid for operating the valve element in a closing direction when being excited.
Implementation Method 2
a solenoid for operating the valve element in a closing direction when being excited
Implementation Method 3
This electromagnetic spill valve comprises a spring member for adding a spring force which biases a valve element to an open position
Implementation Method 4
The mechanical high-pressure pump comprises a plunger that slides within a cylinder by a cam to increase the pressure of the fuel (fuel pressure) in the cylinder
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Fuel in a fuel tank (34) is supplied by a low-pressure pump (40) to intake passage injectors (26) mounted on an intake manifold (14) via a low-pressure fuel supply pipe (36) and a low-pressure fuel distribution pipe (44). A high-pressure pump (32) is provided on the low-pressure fuel supply pipe (36). The pressure of the fuel is boosted by the high-pressure pump (32), and then is supplied to in-cylinder injectors (24) via a high-pressure fuel distribution pipe (28). In an intake passage injection (MPI) mode, excitation of a solenoid (334) is stopped and operation of an electromagnetic spill valve (330) is stopped so as reduce vibration and noise caused by the seating of the electromagnetic spill valve (330) in a valve seat.