Fuel Injection Control IC Voltage Variance Timing
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Solution Overview
Problem
Existing injection control devices for fuel injection valves face challenges in accurately adjusting the energization time due to variations in usage environment, component aging, and PVT parameters, affecting the valve body's opening and closing timing.
Innovation Solution
The proposed injection control device employs a microcontroller and control IC to calculate and adjust the energization command time, using a variance method to detect the valve closing timing with high accuracy by analyzing voltage changes in the solenoid coil, and dynamically changing the calculation of variance values based on thresholds for processing load, drive parameters, and engine state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the energization time is adjusted to compensate for delay times, then the injection amount accuracy is improved, but the complexity of determining the optimal energization time increases due to multiple influencing factors
Solution Approach 1:
The system detects the actual valve closing timing by monitoring voltage changes in the solenoid coil after energization stops, and uses this feedback information to accurately determine injection timing. This feedback mechanism eliminates the need for complex pre-calculations of delay times under various conditions, as the actual timing is measured directly from the system response.
Solution Approach 2:
The patent replaces mechanical timing mechanisms with electrical detection methods. By monitoring the voltage waveform in the solenoid coil, the system electronically determines valve closing timing without requiring mechanical sensors or complex timing calculation mechanisms, thereby reducing overall system complexity.
2Measurement precision
If high-accuracy detection methods are used to determine valve closing timing, then the injection control precision is improved, but the arithmetic processing load increases
Solution Approach 1:
The system extracts only the critical timing information from the voltage waveform - specifically detecting the zero-crossing point or extreme value point that corresponds to valve closing. By focusing only on this specific feature rather than analyzing the entire waveform in detail, the system achieves high detection accuracy with minimal computational effort.
Solution Approach 2:
The patent applies partial action by performing detection only during the critical period after energization stops, rather than continuously monitoring the entire injection cycle. This time-limited detection approach maintains high accuracy for the critical timing event while significantly reducing the overall processing load.
3Reliability
If the detection method adapts to different operating conditions, then the reliability of injection control is improved, but the complexity of the detection algorithm increases
Solution Approach 1:
The system adapts to different operating conditions by detecting changes in the voltage waveform characteristics - specifically identifying the zero-crossing point or extreme value point which naturally shifts with operating conditions. This parameter-based adaptation allows the system to maintain reliability across varying conditions without requiring a complex multi-parameter detection algorithm.
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 approach enhances the detection accuracy of valve closing timing, improving fuel injection precision while reducing the arithmetic processing load and maintaining engine stability across varying conditions.
Implementation Method 1
The fuel injection valve has a built-in solenoid coil and controls the position of the valve body by electrically driving the solenoid coil
Implementation Method 2
when the drive circuit stops energizing the solenoid coil, a voltage change occurring in the solenoid coil is obtained. An induced electromotive force based on a movement speed of the valve body or the movable core is generated in the solenoid coil
Data Source
AI summary
An injection control device includes a control IC that obtains, as sample data, a time change of a voltage generated when a fuel injection valve is driven, and determines a valve closing timing at which injection of fuel from the fuel injection valve is stopped by calculating a degree of variation from the sample data of the voltage. Further, the control IC changes the calculation of the degree of variation when a predetermined condition is satisfied.