Fuel Injection Control Apparatus Voltage Boosting Timing
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Solution Overview
Problem
Existing fuel injection control systems for internal combustion engines face challenges in accurately timing the second injection operation to ensure precise fuel delivery, particularly at high engine speeds where the voltage boosting operation may not be completed in time for the second injection, leading to potential combustion inefficiencies.
Innovation Solution
A fuel injection control apparatus and method that calculates a reference injection timing for the second injection operation based on the completion time of the voltage boosting operation, ensuring that the second injection starts after the voltage has been re-boosted to a stable target value, thereby securing the necessary time for precise fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second injection timing is set based on target timing without considering voltage boosting completion, then injection timing precision is improved, but voltage boosting may not be completed leading to injection failure
Solution Approach 1:
The voltage boosting operation is executed in advance before the second fuel injection operation. The control device calculates a reference second injection timing based on when the voltage boosting will be completed, ensuring that the voltage is ready before injection begins. This preliminary action prevents injection failure while maintaining timing precision.
Solution Approach 2:
The control device monitors the actual voltage level during the boosting operation and compares it with the target voltage. Based on this feedback, the device determines when boosting is complete and adjusts the second injection timing accordingly. This feedback mechanism ensures reliable injection execution while maintaining precise timing control.
2Reliability
If the second injection timing is delayed to wait for voltage boosting completion, then injection reliability is improved, but combustion efficiency deteriorates due to timing delay
Solution Approach 1:
The voltage boosting operation is performed in advance during the interval between first and second injections. By calculating the reference second injection timing based on expected boosting completion, the system prepares the voltage beforehand without delaying the second injection relative to the optimal combustion timing.
Solution Approach 2:
The control device dynamically adjusts the second injection timing based on the actual voltage boosting speed and completion status. If boosting completes faster than expected, the injection timing can be advanced to maintain optimal combustion efficiency. If boosting takes longer, the timing is adjusted accordingly to ensure reliability. This dynamic adjustment resolves the contradiction between reliability and efficiency.
Data Source
AI summary
A fuel injection control apparatus includes a first injection timing setting device, a target second injection timing setting device, a reference injection timing calculator, and a second injection timing setting device. The reference injection timing calculator is configured to calculate, as a reference injection timing, a timing at which a second-injection boosting operation is to be completed. The second-injection boosting operation is to re-boost a reduced voltage which has been reduced because of an execution of a first injection operation by using a booster circuit. The second injection timing setting device is configured to set, as a second injection timing at which a second injection operation is to be started, a later one of a target second injection timing set by the target second injection timing setting device and the reference injection timing calculated by the reference injection timing calculator.