Fuel Injection Valve Timing Under Low Boost Voltage
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Solution Overview
Problem
Conventional fuel injection systems for internal-combustion engines face challenges in maintaining multiple injections while keeping costs low, as the reinforcement of control circuits is limited by cost considerations, and existing systems struggle to provide the required number of injections when boost voltage levels are lowered.
Innovation Solution
A fuel injection system with a booster circuit, boost voltage driver, driver IC, and controller that extends the valve open time of an electromagnetically driven fuel injection valve when the boost voltage is below a predefined normal voltage, ensuring maximum possible injections by adjusting the valve open time based on monitored boost voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of multiple injections is increased to meet growing demand, then injection performance is improved, but control circuit complexity and cost increase
Solution Approach 1:
The fuel injection valve serves multiple functions by performing both main injection and pre-injection through a single electromagnetic coil and valve structure. The controller intelligently switches between different injection modes (single injection, pre-injection, post-injection) based on engine operating conditions, allowing one hardware component to fulfill multiple injection requirements without adding circuit complexity
2Use of energy by moving object
If boost voltage is lowered to reduce power consumption or cost, then energy efficiency is improved, but injection reliability deteriorates
Solution Approach 1:
The controller dynamically adjusts the valve open time parameter based on the actual boost voltage level. When boost voltage is low, the valve open time is extended to ensure sufficient fuel injection quantity and maintain injection reliability. When boost voltage is normal, the valve open time returns to standard duration, optimizing energy efficiency
3Reliability
If valve open time is extended to maintain injection quantity at low boost voltage, then injection reliability is improved, but injection timing precision deteriorates
Solution Approach 1:
The system dynamically adjusts valve open time based on real-time boost voltage measurements rather than using fixed timing. The controller monitors boost voltage continuously and modifies the valve open duration adaptively, allowing the system to maintain both reliability and timing precision under varying voltage conditions by optimizing the opening period for each specific voltage level
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 system maintains high reliability and provides the maximum number of injections even when boost voltage is lowered, ensuring consistent injection characteristics without increasing circuit complexity or costs.
Implementation Method 1
a booster circuit that boosts the voltage of the battery to generate a boost voltage for the engine control unit
Implementation Method 2
a fuel injection valve electromagnetically driven to provide multiple fuel injection to a combustion chamber
Data Source
AI summary
Disclosed is a fuel injection system that is used with an internal-combustion engine to reliably perform a requested fuel injection operation a requested number of times even when a boost voltage is lowered. The fuel injection system monitors the boost voltage immediately before the start of fuel injection, and varies a valve open time in accordance with the monitored boost voltage. Even when the boost voltage is lowered, the fuel injection system performs a fuel injection operation the requested number of times.