Fuel Injection Control Apparatus Adaptive Timing
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Solution Overview
Problem
Existing fuel injection control systems for direct-injection internal combustion engines face challenges in maintaining accurate injection timing due to variations in pressure and temperature, leading to delayed injection end times and adverse effects on combustion performance.
Innovation Solution
A fuel injection control apparatus that includes an air amount detector and an electronic control unit with a microprocessor, which calculates target injection times and determines crank angles for starting and ending fuel injection, allowing for flexible injection modes based on air amount detection, ensuring precise fuel injection timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the injection timing is controlled to start at a predetermined interval, then the injection start timing is precise, but the injection end time is delayed due to variations in fuel pressure and temperature
Solution Approach 1:
The patent applies dynamics by making the injection timing control adaptive rather than fixed. The ECU dynamically adjusts the injection end timing based on detected fuel pressure and temperature conditions, allowing the system to respond to changing operating conditions. This is achieved through calculating target injection times that account for actual fuel conditions, transforming a static timing control into a dynamic one that maintains precision across varying conditions.
Solution Approach 2:
The patent changes the parameters used for injection timing control from a fixed predetermined interval to variable parameters based on actual fuel pressure and temperature. By detecting these physical quantities and using them to calculate adjusted injection times, the system modifies the timing parameters dynamically. This allows the injection end timing to be precisely controlled despite variations in fuel conditions, resolving the contradiction between start timing precision and end timing precision.
2Quantity of substance
If the injection time is extended to ensure complete fuel delivery, then the target amount is achieved, but the injection end time is delayed adversely affecting combustion performance
Solution Approach 1:
The patent implements feedback control by detecting actual fuel pressure and temperature conditions and using this information to adjust the injection timing. The ECU continuously monitors these parameters and calculates the appropriate injection end timing based on the detected conditions. This feedback mechanism ensures that the injection duration is optimized for each operating condition, delivering the complete target fuel amount without excessive delay that would harm combustion performance.
Solution Approach 2:
The patent applies preliminary action by pre-calculating the target injection time based on detected fuel conditions before actual injection occurs. The ECU determines the appropriate injection duration in advance, considering the actual fuel pressure and temperature, and sets the injection timing accordingly. This preliminary calculation ensures that the injection is completed in optimal time for combustion, preventing delays that would adversely affect performance while still delivering the complete fuel amount.
Data Source
AI summary
A fuel injection control apparatus including a microprocessor. The microprocessor is configured to perform calculating a target injection time, determining a first crank angle defining a start of fuel injection and a second crank angle defining an end of fuel injection, controlling a fuel injector in a first injection mode in which the fuel is injected for the first target injection time from a first time point corresponding to the first crank angle or a second injection mode in which the fuel is injected for the second target injection time from a second time point corresponding to a target crank angle, and the controlling including controlling the fuel injector so as to inject the fuel in an intake stroke in the first injection mode, while inject the fuel in a compression stroke in the second injection mode.