LPI Fuel Pump Shutdown Circuit for Noise and Energy Reduction
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Solution Overview
Problem
In LPI engine vehicles, the fuel pump continues to operate after the engine stops, leading to unnecessary noise and energy consumption when the LPG switch is turned off, as the shut-off valves in the fuel tank and regulator do not effectively stop the fuel pump.
Innovation Solution
A fuel pump noise-reduction apparatus that activates shut-off valves and the fuel pump only when the LPG switch is turned on, using battery power, and connects them in parallel with voltage surge preventing diodes to prevent damage from voltage surges, ensuring the fuel pump and valves stop operation when the switch is turned off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel pump continues to operate after the engine stops using another power source, then the fuel supply system remains pressurized, but noise and energy consumption increase due to unnecessary operation
Solution Approach 1:
The shut-off valves are activated before the fuel pump to close the fuel supply path, preventing the fuel pump from operating unnecessarily. This preliminary action ensures that even if the fuel pump receives power, no fuel can flow, eliminating waste energy consumption while maintaining system reliability.
Solution Approach 2:
The patent extracts the fuel pump operation from the main engine control system by providing it with a separate power source that can be independently controlled. This allows the fuel pump to be stopped separately from the engine shutdown, eliminating unnecessary operation and energy waste while maintaining fuel pressure through valve control.
2Object-generated harmful factors
If the shut-off valves are closed to stop fuel supply, then fuel flow is stopped, but the fuel pump continues to operate causing noise
Solution Approach 1:
The patent merges the control of the shut-off valves and fuel pump into a single integrated control system that responds to engine shutdown signals. Both components are controlled simultaneously through a unified control logic, reducing overall system complexity while effectively stopping both fuel flow and pump operation to eliminate noise.
Solution Approach 2:
The control system uses feedback from the engine shutdown signal to simultaneously activate the shut-off valves and stop the fuel pump. This feedback mechanism ensures that both components respond together to the same control input, simplifying the control architecture while achieving noise reduction through coordinated shutdown.
3Loss of energy
If the fuel pump is stopped when the LPG switch is turned off, then noise and energy consumption are reduced, but voltage surges may damage the components
Solution Approach 1:
The patent incorporates protection circuits that cushion against voltage surges before they can damage the shut-off valves and fuel pump. These protection mechanisms are built into the control system, providing advance protection when the LPG switch is turned off and the components are deactivated, allowing energy consumption to be reduced without risking component damage.
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 solution effectively reduces noise and energy consumption by ensuring the fuel pump and shut-off valves in LPI vehicles stop operating when the LPG switch is turned off, preventing unnecessary operation and potential damage from voltage surges.
Implementation Method 1
The fuel pump and shut off valves are each connected in parallel to a voltage surge preventing diode
Data Source
AI summary
A fuel pump noise-reduction apparatus in a Liquefied Petroleum Injection (LPI) vehicle comprises a Liquefied Petroleum Gas (LPG) switch. A plurality of shut off valves are configured for activation upon stoppage of battery power via the LPG switch. A fuel pump in a fuel tank is configured for activation upon stoppage of battery power via the LPG switch. The shut off valves close and the fuel pump stops simultaneously when the LPG switch is deactivated, contributing to a reduction in noise and engine output consumption due to unnecessary operation of the fuel pump when the engine stops.