Engine Fuel Injection Control for Cylinder Wall Wetting
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Solution Overview
Problem
Existing electronic fuel injection systems face inefficiencies in adjusting the initial gasoline injection angle, leading to incomplete combustion and energy loss due to gasoline wetting the cylinder walls, especially when transitioning from light to heavy engine loads and low cylinder temperatures.
Innovation Solution
A self-adaptive control method for the gasoline injection initial angle, which adjusts based on real-time engine conditions such as load, coolant temperature, and rotating speed, using a combination of preset basic angles and adaptive controlling volumes to optimize injection timing and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the initial injection angle is determined from a relationship table based on engine conditions, then the fuel injection timing can be optimized for different operating conditions, but when the engine transitions from light load to heavy load, the cylinder temperature is insufficient and gasoline wets the cylinder wall causing incomplete combustion and energy loss
Solution Approach 1:
The control method performs preliminary heating of the cylinder by delaying fuel injection until the cylinder temperature reaches a predetermined threshold. This preliminary action ensures the cylinder is sufficiently heated before fuel injection, preventing gasoline from wetting the cylinder wall during transient conditions from light to heavy load, thereby eliminating incomplete combustion and energy loss
Solution Approach 2:
The system dynamically adjusts the initial injection angle based on real-time cylinder temperature feedback. When cylinder temperature is below the threshold, the injection angle is delayed; when the threshold is reached, normal injection timing is restored. This dynamic adjustment allows the system to adapt to changing thermal conditions, ensuring complete combustion while maintaining optimization for different operating conditions
2Reliability
If the injection angle is advanced to ensure proper mixing at low temperatures, then combustion can be maintained, but gasoline wets the cylinder wall making vaporization difficult and causing smoke and energy loss
Solution Approach 1:
The control system uses feedback from the cylinder temperature sensor to determine the appropriate injection timing. The ECU continuously monitors cylinder temperature and compares it with the predetermined threshold, adjusting the initial injection angle accordingly. This feedback mechanism ensures injection only occurs when temperature conditions are suitable, preventing gasoline from wetting the cylinder wall and producing smoke while maintaining reliable combustion
Data Source
AI summary
A method of controlling fuel injection to an internal combustion engine to reduce cylinder wall wetting, smokiness, and unclean combustion, on a cumulative basis, applies a self-adaptive control on a gasoline injection initial angle. Gasoline injection initial or original angle is known, being preset, and a self-adaptive controlling volume is added. The self-adaptive controlling volume is the addition of a first self-adaptive controlling volume and a second self-adaptive controlling volume to the original angle. The first self-adaptive controlling volume relates to predicted load and an engine coolant temperature. The second self-adaptive controlling volume is based on the rotating speed of the engine. Cylinder wall wetting is reduced or avoided, smoke is reduced, and cleaner combustion is achieved. An engine fuel injection control apparatus applying the method is also provided.