Engine Fuel Injection Control for Temperature Compensation
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Solution Overview
Problem
Internal combustion engines with both in-cylinder and intake manifold fuel injection mechanisms face challenges in maintaining optimal fuel injection ratios due to temperature variations in the intake manifold injector, leading to potential errors in fuel quantity and engine output variations.
Innovation Solution
A control apparatus that acquires the temperature of the intake manifold injector and adjusts the fuel injection ratio between the in-cylinder and intake manifold injectors, ensuring a higher fuel injection ratio when the intake manifold injector is at a high temperature to prevent under-injection and maintain stable engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fuel injection ratio is set based on standard characteristics without temperature compensation, then the control system remains simple, but fuel injection quantity errors occur when the intake manifold injector temperature changes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the fuel injection ratio based on the temperature characteristic of the intake manifold injector. The control apparatus changes the injection ratio parameter according to whether the injector temperature is high or normal, thereby compensating for temperature-induced injection quantity errors while maintaining a relatively simple control structure.
2Reliability
If the fuel injection ratio is increased to compensate for high temperature injector performance degradation, then fuel injection quantity accuracy improves, but engine output stability may be affected
Solution Approach 1:
The patent implements dynamics by making the fuel injection ratio adjustable based on real-time temperature conditions. The control apparatus dynamically switches between different injection ratio settings (higher ratio for high temperature, standard ratio for normal temperature), allowing the system to adapt to changing conditions while maintaining both injection accuracy and engine output stability.
3Adaptability or versatility
If separate fuel injection mechanisms are used for in-cylinder and intake manifold, then fuel injection flexibility improves, but control complexity increases due to multiple injection ratio settings
Solution Approach 1:
The patent applies segmentation by dividing the fuel injection system into two independent mechanisms (in-cylinder injector and intake manifold injector), each with its own control. This allows flexible fuel injection strategies while managing complexity through modular control of each injector's ratio independently based on temperature conditions.
Data Source
AI summary
For an internal combustion engine having an in-cylinder injector and an intake manifold injector, setting of the ratio of fuel injection (DI ratio) between these injectors is changed depending on whether the intake manifold injector is in a high temperature state or a non-high temperature state (normal state). Specifically, when the intake manifold injector is at a high temperature, the setting of the DI ratio is controlled so that the quantity of fuel to be injected from the intake manifold injector is larger than that according to setting of the fuel injection quantity in the normal state under the same engine conditions.