Fuel Injector Cleaning Composition for Diesel Systems
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Solution Overview
Problem
Modern diesel fuel injector systems face significant challenges due to increased pressures, temperatures, and changes in diesel fuel composition, leading to the formation of stubborn deposits that affect engine performance, and existing cleaning methods are not entirely effective.
Innovation Solution
A cleaning composition comprising aromatic hydrocarbon solvents, propylene glycol ethers, and nitrogen-containing detergents is introduced into the engine fuel delivery system, with specific concentrations of these components to effectively remove deposits from fuel injectors, particularly in high-pressure diesel engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If increased pressures and temperatures are used in diesel fuel injection systems to improve atomization and combustion efficiency, then fuel delivery performance is improved, but deposit formation increases and cleaning becomes more difficult
Solution Approach 1:
The patent applies preliminary action by introducing a cleaning composition into the fuel delivery system before deposits become problematic. The cleaning composition proactively dissolves and removes deposits from fuel injectors and related components, preventing the buildup that would otherwise occur under high-pressure, high-temperature operating conditions. This proactive cleaning approach maintains optimal fuel delivery performance without waiting for deposits to form and cause problems.
2Reliability
If fuel detergents are used to prevent deposit formation, then deposit control is improved, but existing heavy deposits and tenacious deposit regimes still require additional cleaning
Solution Approach 1:
The patent applies parameter changes by using a cleaning composition with specific solvent concentrations (5-50% aromatic hydrocarbons, 10-40% aliphatic hydrocarbons, 5-30% oxygenated solvents) that are optimized for removing heavy and tenacious deposits. This targeted chemical formulation with controlled parameters enables effective removal of existing deposits that standard fuel detergents cannot handle, reducing the need for frequent additional cleaning operations.
3Object-generated harmful factors
If sulfur content in diesel fuel is reduced to meet emissions standards, then exhaust emissions are improved, but fuel oxidatively stability decreases and deposit formation increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a cleaning composition that acts as a mediator between the oxidatively unstable low-sulfur fuel and the fuel injection system. The cleaning composition contains solvents and detergents that compensate for the reduced oxidizing stability of low-sulfur fuel by actively preventing and removing deposits that would otherwise form due to the fuel's increased oxidative tendency, thus maintaining system reliability despite the fuel composition change.
4Shape
If injector orifices are made smaller to decrease droplet size, then atomization quality is improved, but sensitivity to deposits increases and clogging becomes more likely
Solution Approach 1:
The patent applies preliminary action by using the cleaning composition to proactively remove deposits from small injector orifices before they can accumulate and cause clogging. The cleaning composition penetrates the small orifices and dissolves deposits that would otherwise block the narrow passages, maintaining reliable fuel flow through the small-diameter injectors that provide improved atomization.
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 method efficiently cleans diesel fuel injectors, providing long-lasting results and improving engine performance by dissolving both polymeric and sodium-based deposits, even under high-pressure conditions.
Implementation Method 1
A cleaning composition comprising (a) one or more aromatic hydrocarbon solvents; and (b) one or more propylene glycol ethers; and (c) one or more nitrogen-containing detergents
Implementation Method 2
the concentration of the one or more propylene glycol ethers in the cleaning composition is from 20 to 50 wt. %
Data Source
Figure 1
AI summary
Disclosed is a method for cleaning deposits from one or more parts of an engine fuel delivery system, the method comprising introducing into the engine fuel delivery system a cleaning composition comprising (a) one or more aromatic hydrocarbon solvents; and (b) one or more propylene glycol ethers.