Injector Timing Control to Reduce Wall Wetting Emissions
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Solution Overview
Problem
The existing technique for directly injecting fuel into the cylinder results in fuel collection on the piston and cylinder walls, leading to the production of particulate matter and unburned hydrocarbons during combustion.
Innovation Solution
An injector controller that controls fuel injection into the cylinder using a processor and memory to execute specific injection processes in defined crank angular ranges, including a first and second injection range, to minimize fuel collection on the piston and cylinder walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fuel injection is performed during the intake stroke and compression stroke, then fuel can be supplied to the cylinder, but fuel collects on the top surface of the piston and wall surface of the cylinder, causing particulate matter and unburned hydrocarbon emissions
Solution Approach 1:
The fuel injection process is segmented into multiple discrete injection timings within the intake and compression strokes, rather than continuous injection. The controller performs first fuel injection at a first timing and second fuel injection at a second timing, separating the injection events to optimize fuel distribution and prevent excessive fuel collection on piston and cylinder wall surfaces.
Solution Approach 2:
The fuel injection timing is dynamically adjusted based on the piston position and stroke phase. The controller determines optimal injection timings by considering the piston's position in the intake and compression strokes, making the injection strategy adaptive to the dynamic conditions within the cylinder rather than using fixed timing.
2Object-generated harmful factors
If fuel injection timing is optimized to reduce fuel collection, then emissions are reduced, but the control system complexity increases
Solution Approach 1:
The control system automatically determines optimal fuel injection timings based on pre-stored map data that correlates piston position, stroke phase, and emission characteristics. The controller references this pre-calculated information to select appropriate injection timings without requiring complex real-time calculations or additional sensors, simplifying the control architecture while maintaining emission reduction benefits.
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
Reduces particulate matter and unburned hydrocarbon emissions by controlling fuel injection patterns to limit fuel accumulation, enhancing combustion efficiency and emissions control.
Implementation Method 1
an injector performing fuel injection into a cylinder of an internal combustion engine from a side corresponding to top dead center of a piston
Implementation Method 2
The fuel remaining on the wall surface of the cylinder is, for example, vaporized in the cylinder in the exhaust stroke
Implementation Method 3
Each cylinder is a space for burning an air-fuel mixture of intake air and fuel
Data Source
AI summary
A controller includes a processor and memory. The memory stores, as a crank angular range in which fuel injection from the injector is permitted, a first injection range specified in the crank angular range from a start time of an intake stroke to an end time of the intake stroke and a second injection range specified in the crank angular range from a start time of a compression stroke to an end time of the compression stroke. The processor executes a first injection process that causes the injector to perform fuel injection in the first injection range and a second injection process that causes the injector to perform fuel injection in the second injection range B. The second injection range is discontinuous with the first injection range and is narrower than the first injection range.