Engine Drive Control Device Reducing Fuel Wetness via Intake Counterflow
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Solution Overview
Problem
Internal combustion engines face challenges in reducing particulate matter emissions and fuel wetness, particularly during startup when ambient temperatures are low, leading to increased fuel adherence to chamber walls and decreased fuel economy.
Innovation Solution
A drive control device that adjusts fuel injection timing and valve timing to utilize counterflow blowing back into the intake port, reducing fuel wetness by extending the counterflow generation period through advanced exhaust valve closing and intake valve opening timings, thereby improving emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel injection is performed during engine startup at low ambient temperatures, then the engine can start and operate, but fuel adheres to chamber walls increasing fuel wetness and reducing fuel economy
Solution Approach 1:
The system performs preliminary heating of the combustion chamber and intake port before fuel injection during startup. By pre-heating these areas, the fuel that is subsequently injected does not adhere to cold walls, reducing fuel wetness while maintaining reliable engine startup capability.
2Object-generated harmful factors
If multiple injection cycles are used to reduce particulate matter emissions, then emission performance improves, but the complexity of the injection control system increases
Solution Approach 1:
The fuel injection process is divided into multiple separate injection cycles with different timing and duration parameters. By segmenting the injection into distinct phases (main injection, secondary injection, etc.), the system effectively reduces particulate matter emissions through varied injection patterns while using a relatively simple control mechanism that manages each segment independently.
3Adaptability or versatility
If the engine operates at low ambient temperatures, then the engine can run in cold conditions, but fuel economy decreases due to increased fuel adherence
Solution Approach 1:
The system dynamically changes operating parameters including injection timing, injection duration, and valve timing based on ambient temperature conditions. During cold operation, the system adjusts these parameters to reduce fuel adherence to walls while maintaining acceptable fuel economy, allowing the engine to adapt to cold environments without significant fuel economy penalties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces fuel wetness and improves emission performance by increasing the counterflow generation period, enhancing fuel injection efficiency and reducing particulate matter emissions.
Implementation Method 1
A drive control device adjusts fuel injection timing and valve timing to utilize counterflow blowing back into the intake port, reducing fuel wetness by extending the counterflow generation period
Data Source
AI summary
An internal combustion engine includes: a fuel injection valve injecting fuel; an intake timing varying mechanism controlling the opening/closing of an intake valve provided at an intake port; and an exhaust timing varying mechanism controlling the opening/closing of an exhaust valve provided at an exhaust port. When a request has been made to reduce a fuel wet amount, which is a quantity of fuel adhering to a wall surface of the internal combustion engine facing to an injection field where fuel is injected, in the startup of the internal combustion engine, the control device executes wet reduction control. In the wet reduction control, at least one of the intake timing varying mechanism or the exhaust timing varying mechanism is controlled so as to reduce the fuel wet amount by a counterflow blowing back toward the intake port.