Injection Control Device Valve Closing Time Learning
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Solution Overview
Problem
The existing injection control devices face challenges in accurately learning the valve closing time due to overlapping injections in multi-cylinder configurations, which can lead to increased manufacturing costs from additional valve closing detection circuits.
Innovation Solution
An injection control device configuration that designates a specific cylinder for valve closing detection, using two energization instruction switches and a valve closing detection unit to measure and learn the valve closing time, thereby avoiding the need for multiple valve closing detection circuits and enhancing injection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple valve closing detection circuits are added to detect valve closing in each cylinder independently, then measurement precision of valve closing time is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
A single valve closing detection circuit is designed to serve multiple cylinders by selectively detecting valve closing events from different cylinders through switching mechanisms. The circuit can be configured to monitor any cylinder's injection valve closing, making it a universal detection resource that replaces the need for dedicated circuits for each cylinder.
Solution Approach 2:
The system dynamically assigns which cylinder's valve closing is being detected by the single detection circuit. Through control signals that switch the detection target between cylinders, the system adapts the detection function to different operational needs, allowing accurate measurement of valve closing times for multiple cylinders using one circuit.
2Device complexity
If a single valve closing detection circuit is used for multiple cylinders, then device complexity is reduced, but measurement precision of valve closing time deteriorates due to overlapping injections
Solution Approach 1:
The system uses feedback from injection timing information and cylinder identification signals to determine when to switch the detection circuit between cylinders. By receiving feedback about which cylinder is currently being injected and when, the control unit can coordinate the single detection circuit to measure valve closing times accurately without interference from overlapping injections in other cylinders.
Solution Approach 2:
The control unit preliminarily determines the detection target cylinder and switches the detection circuit to the appropriate cylinder before the injection event occurs. This preliminary switching ensures that the detection circuit is properly positioned to capture the valve closing signal from the correct cylinder, avoiding confusion from simultaneous injections in other cylinders.
3Productivity
If valve closing detection is performed during overlapping injections in multi-cylinder configurations, then productivity is improved by maintaining continuous operation, but measurement precision of valve closing time deteriorates
Solution Approach 1:
The control unit acts as an intermediary that manages the single valve closing detection circuit during overlapping injections. It receives injection timing information from multiple cylinders, determines which cylinder's valve closing should be detected at any given moment, and switches the detection circuit accordingly. This intermediary function allows continuous injection operation in multiple cylinders while maintaining accurate valve closing time measurements by preventing simultaneous detection of multiple overlapping injection events.
Data Source
AI summary
An energization instruction switch switches energization instruction signals to instruct energization of fuel injection valves. A first cylinder designation switch designates one of the energization instruction signals to designate a valve closing detection cylinder. A valve closing detection unit monitors downstream voltage of the fuel injection valve to detect occurrence of an inflection point in change of the downstream voltage to detect a valve closing. A second cylinder designation switch designates one of the downstream voltages and designates the valve closing detection cylinder. A valve closing time measuring unit measures a valve closing time, which is from a switching timing of the energization instruction signal from ON to OFF to a valve closing detection timing, for injection of the valve closing detection cylinder. A valve closing time learning unit learns the valve closing time measured by the valve closing time measuring unit.