Fuel Injection Control Device Voltage Drop Compensation
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Solution Overview
Problem
Existing fuel injection control systems for internal combustion engines face challenges in achieving accurate fuel injection quantity and timing due to response delays caused by changes in driving voltage and overlapping injector operations, leading to inaccuracies in fuel injection and potential impacts on combustion.
Innovation Solution
A fuel injection control device that optimizes injector driving control by using a high-voltage generating circuit to supply the necessary voltage for injector opening and a low-voltage circuit for maintaining the open state, allowing for precise control of fuel injection pulse width and timing, even when injectors are driven adjacent to each other, thereby ensuring accurate fuel injection quantity without degrading engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple injectors are driven in overlapping timing to execute multiple fuel injection actions during one cycle, then fuel injection flexibility and combustion control are improved, but driving voltage changes cause response delays and reduce fuel injection quantity accuracy
Solution Approach 1:
The patent applies preliminary action by predicting the driving voltage value before executing fuel injection. The ECU calculates the anticipated driving voltage based on previous injection patterns and uses this predicted value to determine the appropriate pulse width, thereby compensating for voltage drops before they affect injection accuracy
Solution Approach 2:
The patent implements feedback by using the actual driving voltage measurement from the most recent injection event to adjust and calculate the driving voltage for subsequent injections. This closed-loop approach allows the system to adapt to voltage changes and maintain accurate fuel injection quantities across multiple overlapping injection actions
2Manufacturing precision
If the driving timing of injectors is adjusted to prevent overlapping, then fuel injection quantity accuracy is improved, but combustion optimization and emission control are degraded
Solution Approach 1:
The system performs preliminary calculation of the expected driving voltage before each injection event, allowing multiple injectors to be driven in optimized overlapping timing patterns without sacrificing accuracy. The pulse width is determined based on predicted voltage, enabling both combustion optimization and precise fuel delivery
Solution Approach 2:
By continuously measuring actual driving voltage and using it to calculate subsequent injection parameters, the system enables overlapping injector operations with feedback-based compensation. This maintains fuel injection quantity accuracy while preserving the ability to optimize combustion through flexible timing control
3Speed
If high voltage is used to drive injector opening for rapid response, then valve opening speed is improved, but voltage fluctuations and response delays increase when multiple injectors operate simultaneously
Solution Approach 1:
The patent calculates the anticipated driving voltage before each injection event, allowing the ECU to compensate for expected voltage drops from simultaneous injector operations. This preliminary calculation ensures reliable and accurate fuel injection quantities even when multiple high-voltage injectors operate in close timing
Solution Approach 2:
The system uses actual driving voltage measurements from previous injections to adjust and predict voltage levels for subsequent injections. This feedback mechanism stabilizes the driving voltage by adapting injection parameters to the actual electrical conditions, ensuring consistent valve opening performance across multiple simultaneous injector operations
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 ensures accurate fuel injection quantity and improved combustion stability by adjusting the relative timing of injector operations, reducing response delays and maintaining fuel performance across varying operational states of the engine.
Implementation Method 1
The injectors each open or close a valve constituting the injector, by utilizing the magnetic force generated by a built-in coil energized with an electric current
Data Source
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AI summary
Disclosed is an fuel injection control device for an internal combustion engine (1), including: a high-voltage generating circuit (27a) for generating a high voltage exceeding a battery voltage which is a voltage for driving an injector (5), the battery voltage and the high voltage being used to supply a hold current Ih, as well as a valve-opening current Ip as a driving current, to the injector (5), the control device allowing a fuel injection pulse signal to be output to one cylinder in a plurality of fuel injection timings during one cycle of combustion, wherein, after the high voltage is consumed by the driving of the injector (5) and decreases, a time required for the high-voltage generating circuit to restore the high voltage to a predetermined value is calculated, and wherein, when driving control for any other injector (5) is demanded during the restoration time, injection is controlled by correcting at least one of the fuel injection timing and fuel injection pulse width, depending upon the restoration time.