Self-adaptive Oil Spraying Control for Biodiesel Engine NOx Reduction
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Solution Overview
Problem
Current technologies lack an effective control system within biodiesel engines to directly reduce NOx emissions, relying solely on modifying the biodiesel fuel or its proportion.
Innovation Solution
A self-adaptive oil spraying control system for biodiesel engines, comprising an exhaust pipe, NOx sensor, and control module, which adjusts the main spray timing using closed-loop feedback control to maintain NOx emissions within standards without detecting biodiesel proportion, ensuring efficient NOx reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If biodiesel proportion is increased to reduce harmful emissions, then NOx emission decreases, but engine power and stability deteriorate
Solution Approach 1:
The patent implements dynamic adjustment of injection parameters (injection timing, injection pressure, injection quantity) based on real-time detection of biodiesel proportion and engine operating conditions. The control module continuously adapts injection parameters to maintain engine stability while achieving emission reduction, rather than using fixed injection settings.
Solution Approach 2:
The patent employs feedback control by detecting biodiesel proportion in real-time and using this information to adjust injection parameters. The control module receives feedback from sensors monitoring engine performance and emission levels, then modifies injection settings to optimize both emission reduction and engine stability simultaneously.
2Object-generated harmful factors
If biodiesel proportion detection is implemented to optimize combustion, then NOx emission reduces, but device complexity increases
Solution Approach 1:
The patent uses the engine's existing exhaust system and integrated sensors to detect biodiesel proportion, leveraging available system components rather than adding entirely separate detection equipment. The control module utilizes data already being collected by the engine management system, reducing the need for additional dedicated detection devices.
Solution Approach 2:
The control module performs multiple functions: it manages fuel injection timing and pressure, monitors engine operating parameters, detects biodiesel proportion, and adjusts injection parameters accordingly. By consolidating these functions in a single control unit, the system avoids the complexity of separate dedicated systems for each function.
3Power
If injection parameters are fixed to maintain engine power, then engine stability is preserved, but NOx emission increases
Solution Approach 1:
The patent dynamically adjusts injection timing, pressure, and quantity based on real-time detection of biodiesel proportion and engine operating conditions. This dynamic adaptation allows the system to maintain optimal engine power output while achieving reduced NOx emissions, rather than relying on fixed injection parameters.
Solution Approach 2:
The control module changes injection parameters (timing, pressure, quantity) according to detected biodiesel proportion and engine load conditions. By varying these parameters adaptively, the system maintains engine power output while optimizing combustion to reduce NOx emissions.
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
This system reduces NOx emissions by 15% to 10% under normal rotating speed and medium load conditions while maintaining engine power and stability, demonstrating higher efficiency and emission reduction.
Implementation Method 1
a gas sensor, preferably a NOx sensor
Implementation Method 2
an oil sprayer... performing self-adaptive control on main spray timing
Data Source
AI summary
The disclosure relates to a self-adaptive oil spraying control system and method for a biodiesel engine. The control system includes an exhaust pipe, a gas sensor, a control module and an oil sprayer, wherein the exhaust pipe is connected to the oil sprayer, the gas sensor is mounted in the exhaust pipe, and the gas sensor and the oil sprayer are connected to the control module respectively. According to the control method, a main spray advance angle of the engine is subjected to closed-loop control directly through comparison between an idling steady state NOx emission signal and an idling steady state NOx emission value of pure diesel when the engine uses the biodiesel, so that emission of NOx in the exhaust is reduced. Compared with the prior art, the disclosure has the advantages of no need of detecting a biodiesel ratio, high efficiency, good effect and the like.