Percentage-Based Injector Control for Reliable Pre-Injection
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Solution Overview
Problem
Existing injector control devices struggle to set a preceding injection amount to a fuel injection amount that is less than the main injection amount without eliminating preceding injections, particularly in low-displacement engines, due to individual differences between injectors and ECUs, leading to abnormal combustion or reduced noise reduction effects.
Innovation Solution
The injector control device sets the preceding injection amount as a predetermined percentage of the total injection amount, rather than an absolute value, to maintain the noise reduction effect regardless of individual differences, and includes a small injection amount region determination to adjust the injection amount accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the preceding injection amount is set to an absolute value, then the injection amount can be precisely controlled, but the preceding injection may be eliminated due to individual differences between injectors and ECUs
Solution Approach 1:
The patent changes the parameter representation from absolute value to relative percentage value. The injection amount setting unit sets the preceding injection amount as a predetermined percentage (e.g., 50%) of the total injection amount, rather than using fixed absolute values. This parameter transformation allows the system to maintain consistent proportional relationships across different operating conditions and individual component variations, preventing elimination of the preceding injection while maintaining control precision.
2Object-affected harmful factors
If the preceding injection amount is set to less than the main injection amount, then the noise reduction effect is improved, but the preceding injection may be eliminated in low-displacement engines
Solution Approach 1:
The patent transforms the injection amount specification from absolute values to relative percentage values. By setting the preceding injection amount as a predetermined percentage of the total injection amount, the system ensures that the preceding injection amount remains proportionally appropriate across different engine types and operating conditions. This prevents the preceding injection from being eliminated while maintaining the noise reduction benefit of having the preceding injection amount less than the main injection amount.
Solution Approach 2:
The patent introduces dynamic adjustment capability by using percentage-based injection amount setting. The injection amount setting unit can dynamically determine the preceding injection amount based on the total injection amount and predetermined percentages, allowing the system to adapt to different operating conditions (such as low-displacement engines with small total injection amounts) while maintaining the functional relationship between preceding and main injections for noise reduction.
3Adaptability or versatility
If the preceding injection amount is set as a percentage of total injection amount, then individual differences between injectors and ECUs are compensated, but the control complexity increases
Solution Approach 1:
The patent applies parameter transformation from absolute to relative values. The injection amount setting unit stores and uses predetermined percentages (e.g., 50% for preceding injection, 50% for main injection) to calculate actual injection amounts based on the total injection amount. This approach compensates for individual differences between injectors and ECUs without requiring complex calibration procedures or additional sensors, as the percentage-based system naturally adapts to variations in component characteristics.
Data Source
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AI summary
Provided is an injector control device which is capable of setting a preceding injection amount to a fuel injection amount that is less than a main injection amount, while suppressing situations where preceding injections executed prior to a main injection in multi-stage injection are eliminated. An injector control device 2 includes: an injection amount setting unit 211 that sets, as a total injection amount, a total of fuel injection amounts in multi-stage injection in a single cycle, and sets, as a preceding injection amount, a fuel injection amount in a preceding injection executed prior to a main injection in the multi-stage injection; an energization period setting unit 212 that sets an energization period of an injector 31 based on the fuel injection amounts set by the injection amount setting unit 211; and an injector driving unit 213 that controls driving of the injector 31 based on the energization period set by the energization period setting unit 212. The injection amount setting unit 211 sets a fuel injection amount that is a predetermined percentage of the total injection amount as the preceding injection amount.