Supplementary Liquid Injection System for Piston Engine
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing supplementary liquid injection systems for piston engines face challenges with hot and cold corrosion of water injectors due to temperature fluctuations, and existing solutions do not effectively manage corrosion while achieving efficient NOx emission reduction and fuel efficiency.
Innovation Solution
A supplementary liquid injection system with a high-pressure pump, accumulators integrated with flow fuses near each injector, and temperature control to prevent corrosion, allowing for precise injection timing and pressure management to reduce NOx emissions and improve fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If water injection is used to reduce NOx emissions, then temperature in combustion chamber is reduced and NOx emissions decrease, but water injectors are subject to hot corrosion when injection is not in use and cold corrosion when injection is in use
Solution Approach 1:
The system separates the water injection function into two independent systems: a high-pressure injection system for NOx reduction and a low-pressure cooling system for temperature control. This segmentation allows each system to optimize its function without compromising the other, preventing both hot and cold corrosion while maintaining NOx reduction capability.
Solution Approach 2:
A temperature control system acts as an intermediary between the high-pressure injection system and the water injectors. This intermediary continuously supplies low-pressure water to maintain injector temperature within safe operating ranges, preventing corrosion during both injection and non-injection periods.
2Quantity of substance
If direct water injection into cylinders is used, then smaller amount of water is needed compared to intake manifold injection, but water injector must be placed in harsh cylinder conditions
Solution Approach 1:
The system divides water injection into two pressure levels: high-pressure injection for efficient NOx reduction and low-pressure continuous cooling for temperature management. This segmentation enables direct cylinder injection with reduced water quantity while protecting injectors from harsh thermal conditions through the secondary cooling system.
3Measurement precision
If high-pressure injection is used for efficient NOx reduction, then injection precision is improved, but pressure management complexity increases
Solution Approach 1:
The pressure management system is segmented into two independent pressure levels: a high-pressure system (500-2000 bar) for precise injection timing and a low-pressure system for temperature control. Each pressure system operates independently with its own pump and control logic, simplifying overall pressure management while maintaining high injection precision.
Solution Approach 2:
The system dynamically switches between high-pressure injection mode and low-pressure cooling mode, and can operate both simultaneously. The control unit adjusts pressure levels and flow rates dynamically based on engine operating conditions, optimizing both injection precision and temperature management efficiency.
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 system effectively prevents corrosion, ensures efficient NOx reduction, and enhances fuel efficiency by using high-pressure injection and temperature control, while the flow fuses ensure reliable operation and pressure management.
Implementation Method 1
a pump (7) for pressurizing the liquid to a pressure level of at least 500 bar
Implementation Method 2
an accumulator (5) for receiving pressurized liquid from the pump
Implementation Method 3
an injector (3) connected to the accumulator (5) and configured to inject the liquid into a cylinder (2) of the engine
Data Source
Figure 1~2
AI summary
The supplementary liquid injection system for injecting non-combustible liquid into cylinders (2) of a multi-cylinder piston engine (1) comprises a pump (7) for pressurizing the liquid, an accumulator (5) for receiving pressurized liquid from the pump (7), and an injector (3) that is connected to the accumulator (5) and configured to inject the liquid into a cylinder (2) of the engine (1).