Internal-Combustion Fuel Supply with Variable-Volume Pressure Control
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Solution Overview
Problem
Existing fuel pressure control systems in internal combustion engines experience wear in sliding parts of electromagnetic valves due to repeated opening and closing operations during fuel pressure control.
Innovation Solution
A fuel supply device for an internal combustion engine that includes a variable volume mechanism to increase the volume of the downstream-side fuel passage during fuel pressure control, reducing the frequency of opening and closing operations of the electromagnetic valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electromagnetic valve is repeatedly opened and closed to control fuel pressure, then the fuel pressure can be maintained within the desired range, but wear progresses in the sliding parts of the electromagnetic valve
Solution Approach 1:
The patent introduces a preliminary filling action where fuel is filled into the downstream-side fuel passage before the electromagnetic valve closes. This preliminary action reduces the frequency of valve operations needed to maintain fuel pressure, thereby reducing wear on the electromagnetic valve while maintaining stable fuel pressure control.
2Reliability
If the electromagnetic valve is repeatedly opened and closed to control fuel pressure, then the fuel pressure can be adjusted to the target range, but heat generation increases in the electromagnetic valve
Solution Approach 1:
The patent implements a preliminary filling of fuel into the downstream-side fuel passage before valve closure. This reduces the number of repeated opening and closing cycles, thereby reducing heat generation in the electromagnetic valve while maintaining effective fuel pressure control within the target range.
3Duration of action of stationary object
If the volume of the downstream-side fuel passage is increased, then the frequency of electromagnetic valve operations is reduced, but the device complexity increases
Solution Approach 1:
The patent connects the downstream-side fuel passage to the upstream-side fuel passage through a nested structure where the downstream-side passage is integrated into the existing fuel system architecture. This nesting approach increases the effective volume to reduce valve operation frequency while minimizing additional device complexity by utilizing the existing fuel passage layout.
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 implementation of a variable volume mechanism reduces wear and heat generation in the electromagnetic valve, thereby extending its lifespan and improving the efficiency of fuel pressure control.
Implementation Method 1
The processing circuitry is configured to execute a volume increasing process that operates the variable volume mechanism to increase a volume of the downstream-side fuel passage during the execution of the fuel pressure control
Implementation Method 2
an electromagnetic valve that is provided in the fuel passage so as to open and close the fuel passage
Data Source
AI summary
A fuel supply device for an internal combustion engine includes a tank, a fuel injection valve, a fuel passage, a second shut-off valve to open and close the fuel passage, a variable volume mechanism configured to vary the volume of a downstream-side fuel passage, which is a section of the fuel passage that is connected to a downstream side of the electromagnetic valve, and a controller that executes a fuel pressure control. In the fuel pressure control, the second shut-off valve is repeatedly opened and closed such that the fuel pressure in the downstream-side fuel passage falls within a range defined by an upper limit value and a lower limit value. The controller executes a volume increasing process that operates the variable volume mechanism to increase the volume of the downstream-side fuel passage during the execution of the fuel pressure control.