Booster Device for Driving Injector with Dynamic Charging Control
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Solution Overview
Problem
Existing fuel injection devices experience insufficiency in boost voltage when injection intervals are short, leading to varying fuel injection characteristics and potential overheating of the booster circuit, which can result in circuit damage.
Innovation Solution
A booster device that includes a coil, a switching element, a capacitor, and a diode, with a control circuit that adjusts the switching element's on/off frequency and duty ratio to increase charging speed when the injection interval is short, ensuring a constant boost voltage is applied to the injector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the injection interval is short, then the fuel injection frequency increases, but the boost voltage becomes insufficient and the valve opening speed decreases
Solution Approach 1:
The control circuit performs preliminary charging of the capacitor during the injection interval before the actual injection occurs. By detecting whether the interval between successive injections is short, the system proactively increases the charging current in advance to ensure sufficient boost voltage is available when the injection timing arrives, preventing valve opening delays.
Solution Approach 2:
The charging current is made dynamic rather than fixed. The control circuit adjusts the charging current magnitude based on the detected injection interval length, increasing it when intervals are short and maintaining normal levels when intervals are sufficient. This dynamic adaptation ensures optimal valve opening speed across varying injection frequencies.
2Speed
If the charging current is continuously increased to maintain boost voltage, then the valve opening speed improves, but the circuit temperature rises excessively
Solution Approach 1:
The charging current is dynamically adjusted based on actual injection interval requirements rather than being continuously high. The control circuit detects the interval between injections and only increases charging current when intervals are short, otherwise using normal charging current. This dynamic control maintains valve opening speed while preventing unnecessary heat generation during normal operation intervals.
Solution Approach 2:
The charging current parameter is changed conditionally based on injection timing characteristics. When the injection interval is detected to be short, the charging current parameter is increased to ensure sufficient boost voltage. When intervals are normal, the charging current returns to standard levels, thereby maintaining performance only when needed and reducing overall thermal load on the circuit.
3Volume of moving object
If a small-capacity charge capacitor is used, then the device size decreases, but the charging time required increases
Solution Approach 1:
The system performs preliminary charging of the small-capacity capacitor during the injection interval before each injection event. By detecting short intervals in advance, the control circuit proactively charges the capacitor to the required voltage level before the injection timing arrives, ensuring that even a small capacitor can deliver sufficient boost voltage without requiring excessive charging time during critical injection periods.
Solution Approach 2:
The charging current is dynamically increased when short injection intervals are detected, allowing a small-capacity capacitor to charge quickly enough for the next injection. This dynamic current adjustment compensates for the smaller capacitor size by providing higher charging power when needed, maintaining adequate charging time margins despite the reduced capacitor capacity.
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 maintains consistent fuel injection characteristics and prevents overheating by ensuring a sufficient boost voltage is applied, even during close injection timings, thereby reducing the risk of circuit damage and maintaining injection precision.
Implementation Method 1
a capacitor for applying a voltage to the injector
Implementation Method 2
a diode having an anode connected to a connection point of the coil and the switching element and a cathode connected to the capacitor
Implementation Method 3
a coil, a switching element which is connected to the coil in series and turns on/off the conduction of the coil
Data Source
AI summary
Provided is a booster device for driving an injector which can suppress an insufficiency of a boost voltage applied to the injector even when the fuel injection interval is short. A boost driver (switching element) is connected to a boost coil in series and turns on/off the conduction of the boost coil. A boost capacitor applies a voltage to the injector. A boost diode has an anode connected to a connection point of the boost coil and the boost driver and a cathode connected to the boost capacitor. A boost gate control circuit controls the boost driver to be turned on/off so as to increase a charging speed of the boost capacitor increases when a decision period indicating a period corresponding to an injection interval of the injector is equal to or less than the first threshold value.