Fuel Injection Valve Control via Voltage Variation Analysis
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Solution Overview
Problem
Existing injection control devices face challenges in accurately detecting and learning the valve-closing time of fuel injection valves due to variations in environmental conditions and component parameters, leading to difficulties in precise injection amount adjustment.
Innovation Solution
An injection control device that includes an arithmetic unit to determine the valve-closing time based on the degree of variation in voltage changes during fuel injection, an injection amount change unit to adjust the required injection amount, and a learning unit to repeatedly control fuel injection to learn the valve-closing time, thereby ensuring reliable detection and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the valve-closing time is detected using the differential method, then the detection speed is improved, but the measurement precision deteriorates due to the need for correction to make the twice differential value coincide with the actual valve-closing time
Solution Approach 1:
The patent extracts the core characteristic of valve-closing time detection by directly using the degree of variation in voltage time-change without applying differential processing. This removes the need for complex correction calculations while maintaining detection speed, thereby resolving the contradiction between detection speed and measurement precision.
2Manufacturing precision
If the energization time is adjusted to account for delay times, then the injection amount accuracy is improved, but the device complexity increases due to the need for multiple parameter adjustments and corrections
Solution Approach 1:
The patent implements a feedback mechanism where the learned valve-closing time is used to automatically correct the energization time. The arithmetic unit continuously refines the valve-closing time detection based on voltage variation patterns, and this learned value feeds back to adjust the injection control, simplifying the overall control logic while maintaining high injection accuracy.
Solution Approach 2:
The system performs self-learning of the valve-closing time through the arithmetic unit analyzing voltage variations. This self-service capability eliminates the need for manual calibration and complex external correction mechanisms, reducing device complexity while improving injection amount accuracy through automatic adaptation.
3Measurement precision
If the valve-closing time is directly detected by measuring the degree of variation in voltage time-change, then the measurement precision is improved, but the reliability deteriorates when the injection amount is small making degree of variation detection difficult
Solution Approach 1:
The patent applies preliminary action by using the learning unit to accumulate and learn valve-closing time characteristics across multiple injection cycles. This pre-learning process builds a reliable reference database that can be applied even when individual measurements at low injection amounts are difficult to detect, thereby improving reliability without sacrificing measurement precision.
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 solution enables the reliable learning and detection of valve-closing time, allowing for accurate adjustment of the injection amount and improving the precision of fuel injection control.
Implementation Method 1
The fuel injection valve incorporates a solenoid coil and electrically drives the solenoid coil to control the position of the valve element
Implementation Method 2
a voltage generated when the fuel injection valve is driven... a voltage value or a current value of an electromagnetic coil is acquired as a sample value
Data Source
AI summary
An injection control device includes: an arithmetic unit that obtains a valve-closing time for stopping injection of fuel from a fuel injection valve based on a degree of variation in a time change of a voltage generated when the fuel injection valve is driven based on a required injection amount; an injection amount change unit that increases or decreases the required injection amount; and a learning unit that repeats injection control of the fuel to learn the valve-closing time obtained by the arithmetic unit.