Fuel Injection Control Apparatus for Dynamic Timing Priority
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Solution Overview
Problem
Existing fuel injection control systems for direct-injection internal combustion engines face challenges in maintaining consistent injection timing due to variations in pressure and temperature, leading to potential delays in injection end time, which can adversely affect combustion performance.
Innovation Solution
A fuel injection control apparatus that includes an air amount detector and an electronic control unit with a microprocessor to calculate target injection times and crank angles, allowing for switching between injection start priority and end priority modes based on operating conditions, ensuring accurate fuel injection timing and frequency according to various engine modes.
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 accurate, but the injection end time may be delayed due to variations in fuel pressure and temperature
Solution Approach 1:
The patent implements dynamic injection timing control by switching between two modes: injection start priority mode (where injection starts at a predetermined crank angle) and injection end priority mode (where injection ends at a predetermined crank angle). This dynamic switching allows the system to adapt to varying fuel conditions (pressure and temperature) and select the appropriate control strategy, thereby resolving the contradiction between accurate start timing and accurate end timing
Solution Approach 2:
The patent changes the control parameter from fixed injection duration to variable injection duration based on detected fuel conditions. By monitoring fuel pressure and temperature, the ECU adjusts the injection timing and duration parameters to maintain optimal combustion performance, preventing injection end delay while ensuring accurate start timing when needed
2Quantity of substance
If the injection duration is extended to ensure complete fuel delivery, then the target fuel amount is achieved, but the injection end time is delayed affecting combustion performance
Solution Approach 1:
The patent employs feedback control by monitoring fuel pressure and temperature conditions, then adjusting the injection timing and duration accordingly. The ECU uses detected fuel conditions to determine whether to prioritize injection start timing or end timing, dynamically optimizing the injection schedule to deliver the target fuel amount without delaying combustion, thus resolving the contradiction between fuel quantity and combustion performance
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 an injection start priority 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 an injection end priority 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 the injection start priority mode or the injection end priority mode in accordance with an injection mode.