Fuel Injector Current Correction for Injection Uniformity
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Solution Overview
Problem
In multiple-cylinder internal combustion engines, the variation in current detection circuits across fuel injector groups leads to uneven control of fuel injector driving states, resulting in variations in fuel injection quantity and valve-opening responsivity, potentially causing excess or deficiency in fuel injection.
Innovation Solution
A fuel injection control device that includes an acquisition unit to obtain current change parameters for each driving system and a current correction unit to execute corrections based on these parameters, ensuring that the driving states of fuel injectors are optimized and the fuel injection quantity is properly controlled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current detection circuits are provided to each driving system to control fuel injector driving states, then fuel injection control precision is improved, but variation in current detection circuit characteristics causes uneven control and fuel injection quantity variation
Solution Approach 1:
The control device measures the actual driving current of each fuel injector through current detection circuits and compares it with the target driving current. Based on the comparison result, the control device adjusts the driving signal to correct deviations, ensuring uniform fuel injection control across all injectors despite variations in current detection circuit characteristics.
Solution Approach 2:
The control device dynamically adjusts driving parameters such as voltage level and pulse width of the driving signal based on the measured actual driving current. By changing these parameters in real-time, the system compensates for variations in current detection circuit characteristics and maintains consistent fuel injection quantity across all cylinders.
2Speed
If high voltage is initially applied to improve valve-opening responsivity, then valve-opening speed is improved, but energy consumption increases
Solution Approach 1:
The control device applies high voltage only during the initial phase of fuel injection to achieve rapid valve opening, then switches to low voltage for the remainder of the injection period. This periodic voltage application pattern maintains high valve-opening responsivity while significantly reducing overall energy consumption compared to continuous high voltage application.
Solution Approach 2:
The control device applies high voltage in advance at the beginning of the fuel injection cycle to ensure rapid valve opening and proper fuel atomization. After the preliminary high voltage pulse establishes the necessary valve opening state, the system transitions to low voltage to maintain the injection, avoiding continuous high energy consumption.
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 current correction mechanism ensures that the driving states of fuel injectors are aligned, optimizing fuel injection control and stabilizing the fuel injection quantity across all cylinders, thereby reducing variations and improving engine performance.
Implementation Method 1
a coil applying voltage is initially a high voltage in a valve-opening state and then switched to a low voltage
Implementation Method 2
a switching from the high voltage to the low voltage is executed based on a sensed current sensed by a current detection circuit
Data Source
AI summary
A fuel injection control device for an internal combustion engine which is applied to a fuel injection system of the internal combustion engine, the fuel injection system including fuel injectors, driving circuits that drive the fuel injectors in each of driving systems into which the fuel injectors are divided, and current detection circuits that are provided to the driving systems, respectively, and the current detection circuits that sense driving currents of corresponding fuel injectors. The fuel injection control device includes an acquisition unit to acquire a current change parameter that is a parameter correlative to a change quantity of a sensed current per unit time in each of the driving systems, and a current correction unit to execute a current correction in at least one of the driving systems based on the current change parameter in each of the driving systems.