Fuel Injector Control via Pressure Wave Compensation
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Solution Overview
Problem
Fuel injection systems experience variations in fuel delivery due to pressure waves within the injector, leading to non-linear relationships between demanded and supplied fuel, affecting emission levels and system performance.
Innovation Solution
A method to control fuel injector operation by determining a compensation value based on engine operating parameters, such as fuel pressure and temperature, to adjust the injector opening time and compensate for phase errors between modelled and actual pressure waves, thereby mitigating fuel delivery errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve needle opens and closes rapidly to increase fuel injection speed, then productivity is improved, but pressure waves are generated that cause fuel delivery errors
Solution Approach 1:
The ECU calculates a compensation value based on engine operating parameters before executing the fuel injection. This preliminary calculation allows the system to pre-determine the necessary pulse width adjustment that will counteract the expected pressure wave effects, ensuring accurate fuel delivery even with rapid valve operation
Solution Approach 2:
The system dynamically adjusts the injector pulse width by applying a compensation value that changes based on engine operating parameters such as fuel pressure and temperature. This parameter modification compensates for pressure wave effects without requiring mechanical changes to the injector hardware
2Manufacturing precision
If the injector pulse width is reduced to compensate for high fuel pressure, then fuel delivery accuracy is improved, but the system becomes more sensitive to pressure variations
Solution Approach 1:
The ECU continuously monitors engine operating parameters including fuel pressure and temperature, and uses this feedback to calculate appropriate compensation values. This closed-loop approach allows the system to adapt to changing conditions while maintaining stable and accurate fuel delivery across various operating scenarios
3Manufacturing precision
If complex hardware solutions are implemented to mitigate pressure waves, then fuel delivery accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical pressure wave mitigation hardware with an electronic control solution. The ECU calculates compensation values based on engine operating parameters and adjusts the injector pulse width accordingly, achieving accurate fuel delivery through software-based compensation rather than mechanical modifications to the injector structure
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 effectively reduces fuel delivery errors caused by pressure variations, ensuring a more accurate and consistent fuel supply, thereby improving engine performance and emission levels.
Implementation Method 1
the ECU actives the solenoid 16, causing the valve needle 18 to be pulled upwards by magnetic force
Data Source
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AI summary
A method of controlling the operation of a fuel injector within an engine system to compensate for fuel delivery errors arising from pressure variations within the engine system, the injector being associated with an injector operating value, the method comprising: receiving data related to at least one engine operating parameter; determining a compensation value for the injector operating value in dependence on the at least one engine operating parameter; applying the compensation value to the injector operating value in order to control the operation of the fuel injector.