LPG Fuel Pump Noise Reduction via IFB ECU Control
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Solution Overview
Problem
In LPI engine vehicles, the fuel pump continues to operate unnecessarily when the LPG switch is turned off, leading to increased noise and output consumption due to continuous activation by another power source.
Innovation Solution
A fuel pump noise reducing apparatus that uses an Interface Box (IFB) Electronic Control Unit (ECU) to detect the voltage from the LPG switch, determining when it is off and stopping the fuel pump by isolating battery power through a relay, thereby closing shut off valves in the regulator and fuel tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel pump is continuously activated by another power source when the LPG switch is turned off, then the fuel supply system remains ready for immediate operation, but noise and output consumption increase due to unnecessary operation
Solution Approach 1:
The fuel pump operation is made dynamic by linking it to the LPG switch state through the IFB ECU. The pump operates only when the LPG switch is ON (engine running) and stops automatically when the switch is OFF (engine stopped), transforming a static continuous operation into a dynamic conditional operation that adapts to system state
Solution Approach 2:
The IFB ECU provides feedback control by continuously monitoring the LPG switch state and adjusting the fuel pump operation accordingly. When the LPG switch is turned OFF, the IFB ECU detects this state and sends a signal to stop the fuel pump, creating a closed-loop control system that prevents unnecessary operation
2Reliability
If the fuel pump is continuously activated by another power source when the LPG switch is turned off, then the fuel supply system remains ready for immediate operation, but output consumption increases due to unnecessary operation
Solution Approach 1:
The fuel pump operation is made dynamic by linking it to the LPG switch state through the IFB ECU. The pump operates only when the LPG switch is ON (engine running) and stops automatically when the switch is OFF (engine stopped), transforming a static continuous operation into a dynamic conditional operation that adapts to system state
Solution Approach 2:
The IFB ECU provides feedback control by continuously monitoring the LPG switch state and adjusting the fuel pump operation accordingly. When the LPG switch is turned OFF, the IFB ECU detects this state and sends a signal to stop the fuel pump, creating a closed-loop control system that prevents unnecessary operation
3Reliability
If the fuel pump is continuously activated by another power source when the LPG switch is turned off, then the fuel supply system remains ready for immediate operation, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The IFB ECU is given multiple functions: it controls the shut off valves in the fuel tank and regulator, manages the fuel pump operation, and monitors the LPG switch state. By making the IFB ECU a multi-functional control unit, the patent avoids adding separate dedicated controllers for each function, thereby managing complexity while achieving reliable fuel supply control
Data Source
AI summary
A fuel pump noise reducing apparatus and a methods for a Liquefied Petroleum Injection (LPI) vehicle stops fuel provision by shutting off valves if a Liquefied Petroleum Gas (LPG) switch is turned off. Also, operation of a fuel pump is stopped by allowing an Interface Box (IFB) Electronic Control Unit (ECU) to turn off a relay and by insulating battery power provided to the fuel pump, thereby resulting in a reduction of noise and engine output consumption generated from unnecessary operation of the fuel pump.