Injection Controller Voltage Boosting for Low Voltage Operation
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Solution Overview
Problem
Existing injection controllers face difficulties in reliably operating injection valves at low voltage conditions, as they struggle to supply enough electric current to the driving coil, leading to inconsistent fuel injection in vehicle engines.
Innovation Solution
The proposed injection controller employs a microcomputer-controlled electronic control unit with a discharge switch, constant current switch, and cylinder selection switch, utilizing boosted voltage and PWM techniques to maintain current within specific control ranges, ensuring reliable valve operation even at low voltage levels by applying boosted voltage when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the injection valve is operated at low voltage (8V or 6V), then power consumption is reduced, but the reliable operation of the injection valve becomes difficult due to insufficient current supply to the driving coil
Solution Approach 1:
The patent applies dynamic voltage control by switching between normal voltage (12V) and boosted voltage (24V or higher) based on real-time current feedback. The control unit monitors the current through the driving coil and dynamically adjusts the voltage level to maintain reliable valve operation while optimizing power consumption, rather than using a fixed voltage level.
Solution Approach 2:
The patent changes the voltage parameter applied to the driving coil based on operating conditions. By using a voltage booster circuit to increase the voltage from normal level (12V) to boosted level (24V or higher) when needed, the system maintains sufficient current flow through the coil for reliable valve operation while allowing for lower power consumption during normal conditions.
2Use of energy by moving object
If the voltage applied to the driving coil is reduced to low voltage levels, then energy efficiency improves, but the electric current required for keeping the injection valve open cannot be supplied
Solution Approach 1:
The system dynamically adjusts the voltage and current levels based on real-time feedback from the current detector. When the detected current falls below the threshold required for maintaining valve opening, the control unit activates the voltage booster to increase current supply, ensuring the valve remains reliably open while minimizing energy consumption during normal operation.
Solution Approach 2:
The patent implements a feedback control mechanism where the current detector continuously monitors the current flowing through the driving coil and provides feedback to the control unit. Based on this feedback, the control unit decides whether to activate the voltage booster to maintain sufficient current levels, creating a closed-loop control system that balances energy efficiency with current supply requirements.
3Reliability
If normal voltage (12V) is applied to the driving coil, then sufficient current is supplied for reliable valve operation, but power consumption increases
Solution Approach 1:
Instead of continuously applying normal voltage (12V) to the driving coil, the system dynamically switches between normal voltage mode and boosted voltage mode based on current detection. The control unit activates the voltage booster only when the current through the coil falls below the required threshold, thereby maintaining reliable valve operation while reducing overall power consumption during normal operating conditions.
Solution Approach 2:
The system employs periodic monitoring of the current through the driving coil and applies boosted voltage only during periods when current supplementation is needed. This periodic intervention approach maintains reliable valve operation while minimizing the duration and frequency of high-power consumption events, thereby reducing overall energy loss.
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 ensures reliable and consistent opening and closing of injection valves, maintaining current within controlled ranges even at low voltage conditions, thereby improving fuel injection precision and reliability.
Implementation Method 1
a voltage booster that boosts the power supply voltage to a higher voltage level, and applies the boosted voltage to the coil when the application voltage is lower than a threshold voltage
Implementation Method 2
an injection valve 2 for injecting and supplying fuel to an engine having N-number of cylinders (N≥1), wherein the injection valve 2 includes an electromagnetic coil 3
Data Source
AI summary
An injection controller has a voltage applicator that applies a voltage to a driving coil of an injection valve. After a voltage is applied to the driving coil with a peak current for opening the injection valve, the voltage applicator applies a power supply voltage to the driving coil in an ON-OFF manner, to supply the driving coil with a less-than-peak current. A comparator detects whether a terminal voltage at a terminal of the coil is less than a predetermined threshold voltage. Upon detecting that the terminal voltage is less than the threshold voltage, a discharge switch applies a boosted voltage to the driving coil.