Diesel Engine Cold Start Control via Dynamic Fuel Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional engine control systems for diesel engines face challenges in cold starting, particularly in low temperatures, leading to unstable idle RPM, vapor lock phenomena, and inefficient combustion due to the need for numerous tests across varying temperature and pressure conditions, which increases development time and cost and can degrade engine performance.
Innovation Solution
A method and apparatus that determine a combustion delay, phase, latent heat of fuel, and total heat by combustion, allowing for optimized fuel injection timing and amount adjustments based on detected parameters, using a controller and sensors to improve cold starting conditions in diesel engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional engine control systems use fixed fuel injection parameters for cold starting, then the control system is simple, but the engine exhibits unstable idle RPM, vapor lock phenomena, and incomplete combustion in low temperature conditions
Solution Approach 1:
The control system dynamically adjusts fuel injection parameters (pilot injection amount, main injection amount, injection timing) based on real-time detection of combustion state, intake air temperature, and engine speed. This dynamic adaptation enables the system to maintain stable combustion across varying cold starting conditions without requiring complex hardware modifications.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller continuously monitors combustion state parameters (such as combustion pressure, temperature, and timing) and uses this information to adjust subsequent fuel injection parameters. This closed-loop control ensures stable idle RPM and prevents vapor lock by continuously optimizing combustion conditions during cold starting.
2Manufacturing precision
If numerous tests are performed for each temperature and atmospheric pressure condition to determine optimal control parameters, then optimal performance is achieved, but development time and cost increase significantly
Solution Approach 1:
The system uses detected combustion state parameters (combustion delay, combustion phase, latent heat of fuel, total amount of heat by combustion) to dynamically calculate and adjust fuel injection parameters. This parameter-based control approach eliminates the need for extensive physical testing across different temperature and pressure conditions, as the system adapts automatically based on real-time measurements.
Solution Approach 2:
The control system performs self-optimization by automatically determining optimal fuel injection parameters based on detected combustion characteristics. The controller calculates the required pilot injection amount, main injection amount, and timing based on measured combustion state, enabling the system to adapt to different environmental conditions without requiring external calibration or extensive testing.
3Productivity
If fixed fuel injection timing and amount are used in cold starting conditions, then the control system is simple, but power performance deteriorates due to incomplete combustion
Solution Approach 1:
The system performs preliminary combustion preparation through pilot injection before the main fuel injection. The controller determines the pilot injection amount based on detected combustion state parameters, ensuring that combustion begins optimally in advance. This preliminary action prevents incomplete combustion and maintains power performance during cold starting by preparing the combustion chamber conditions beforehand.
Solution Approach 2:
The fuel injection process is segmented into multiple stages: pilot injection phase and main injection phase. The controller independently controls the timing and amount of each phase based on detected combustion characteristics. This segmentation allows precise optimization of each combustion stage, ensuring complete combustion and maintaining engine power performance without requiring overly complex single-stage control.
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 approach enhances the startability and fuel efficiency of diesel engines by optimizing combustion state through precise fuel injection control, reducing the need for extensive testing and minimizing performance degradation.
Implementation Method 1
The diesel engine combusts due to compression and ignition
Implementation Method 2
an engine of the compression ignition type compresses only an air and injects fuel into the air when the air becomes high temperature, so the engine causes a spontaneous combustion
Data Source
AI summary
A method for controlling a cold starting of a diesel engine vehicle may include determining whether a cold starting condition is satisfied by detecting data for controlling a diesel engine, determining torque generated by combustion for starting the diesel engine when the cold starting condition is satisfied, determining a combustion delay and a combustion phase based on the torque and detected data, determining a main injection timing according to the determined combustion delay and combustion phase, determining a latent heat of fuel based on the torque and detected data, determining a pilot injection amount according to the determined latent heat of fuel, determining a total amount of heat by combustion based on the torque and detected data, determining a main injection amount according to the determined total amount of heat, and controlling an operation of an injector based on the main injection timing, pilot injection amount and main injection amount.