Battery-less Fuel Injection System with Pressure-Based Start Control
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Solution Overview
Problem
Battery-less fuel injection systems face difficulties in starting engines due to insufficient fuel pressure, leading to large particle diameter fuel injection and decreased engine startability, especially in cold conditions, without the need for additional mechanical parts or larger electric pumps.
Innovation Solution
Incorporating a fuel pressure sensor and ECU with starting state injection control means that suspend fuel injection until the detected fuel pressure exceeds a set pressure, and allowing injection only when both temperature and pressure conditions are met, ensuring sufficient fuel vaporization and atomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel injection is performed immediately after engine start to achieve early initial explosion, then engine startability is improved, but fuel pressure is insufficient leading to large particle diameter fuel injection and decreased combustion efficiency
Solution Approach 1:
The ECU performs preliminary detection of fuel pressure via the fuel pressure sensor before initiating fuel injection. This preliminary action ensures that injection only occurs when fuel pressure has reached a sufficient level, preventing large particle diameter fuel injection while still enabling early injection once conditions are met.
Solution Approach 2:
The system uses a fuel pressure sensor to provide real-time feedback on fuel pressure conditions to the ECU. Based on this feedback, the ECU dynamically controls the timing of fuel injection, creating a closed-loop control system that adapts to actual fuel pressure conditions during engine startup.
2Stress or pressure
If additional mechanical parts such as mechanically driven fuel pump or fuel pressurization device are added to increase fuel pressure during starting, then fuel pressure is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical fuel pressurization devices with an electronic control system. The ECU controls the electric fuel pump and uses sensor feedback to manage fuel pressure electronically, eliminating the need for additional mechanical pressurization components while achieving the same functional goal.
Solution Approach 2:
The existing electric fuel pump and ECU are utilized to self-regulate fuel pressure during startup. The system uses its own components (fuel pump, sensor, ECU) to monitor and control fuel pressure without requiring external mechanical assistance, making the existing system serve its own pressurization needs.
3Stress or pressure
If larger electric fuel pump is used to ensure sufficient fuel pressure during starting, then fuel pressure is improved, but system cost and generator burden increase
Solution Approach 1:
The system dynamically adjusts fuel injection timing based on real-time fuel pressure conditions rather than using a statically oversized pump. The ECU monitors fuel pressure and delays injection until sufficient pressure is achieved, allowing the use of a standard-sized fuel pump while ensuring proper fuel pressure at injection time.
Solution Approach 2:
The system changes the timing parameter of fuel injection based on fuel pressure conditions. By adjusting when injection occurs (delaying until sufficient pressure is reached) rather than changing the pump size, the system achieves proper fuel pressure delivery without increasing hardware specifications or cost.
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 configuration prevents the injection of large particle diameter fuel, simplifies the system, maintains fuel circulation efficiency, and improves engine startability without requiring extra mechanical parts or larger generators, ensuring reliable engine starting across various temperatures.
Implementation Method 1
a fuel pressure sensor for detecting the pressure of the fuel supplied from the fuel pump to the injector
Implementation Method 2
a generator driven by the engine, to activate the injector, the fuel pump, and the ECU
Data Source
AI summary
A battery-less fuel injection system, provided with an injector for injecting fuel supplied to an engine, a fuel pump for supplying fuel to the injector, and an ECU for controlling the injector, wherein a fuel pressure sensor for detecting the fuel pressure given to the injector is provided, and the ECU controls the fuel injection in the process of starting the engine, so that execution of fuel injection is suspended when the fuel pressure detected by the fuel pressure sensor is a set pressure or less, until it is confirmed that the detected fuel pressure has exceeded the set pressure.