Injector Activation Correction via Pressure-Temperature Map
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Solution Overview
Problem
Fuel injection systems in internal combustion engines face challenges due to manufacturing tolerances and aging of injectors, leading to variations in fuel metering, particularly in the small quantity range, which complicates calibration and affects combustion quality and emissions.
Innovation Solution
A simplified injector calibration method using pressure- and temperature-dependent correction values for the activation period, eliminating the need for complex real-time measurement and regulation, by storing injector-individual correction values in a characteristics map and applying them in the pilot control of the injector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex real-time measurement and regulation is used for injector calibration, then manufacturing precision and aging effects are addressed, but device complexity and computing complexity increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-determining correction values for activation periods at different operating conditions (pressures and temperatures) and storing them in a characteristics map before actual operation. During fuel injection, the system simply retrieves the appropriate correction value from the map rather than calculating it in real-time, thereby eliminating complex real-time measurement and regulation while maintaining precise compensation for manufacturing tolerances and aging effects
Solution Approach 2:
The patent changes the parameter representation by storing correction values as a function of pressure and temperature in a characteristics map. Instead of using complex real-time measurements, the system selects pre-calculated correction values based on current pressure and temperature conditions, simplifying the calibration process while maintaining accuracy across varying operating conditions
2Manufacturing precision
If injector-individual calibration is performed for each activation operation, then fuel metering accuracy is maintained, but productivity and operational efficiency decrease
Solution Approach 1:
The system performs calibration work in advance by determining correction values for various operating conditions before actual fuel injection operations. These pre-calculated values are stored in a characteristics map, allowing the control unit to quickly retrieve appropriate correction values during operation without performing complex calculations in real-time, thus maintaining accuracy while improving operational efficiency
Solution Approach 2:
The patent implements periodic action by updating correction values in the characteristics map at predefined or regular intervals during the entire period of operation, rather than recalibrating for each activation. This approach maintains fuel metering accuracy while significantly reducing the computational burden during normal operation
3Reliability
If complex regulation technology is used to compensate for injector variations, then combustion quality is maintained, but loss of time and computational overhead increase
Solution Approach 1:
The patent eliminates computational delays by pre-calculating and storing correction values for activation periods at different pressure and temperature conditions. During fuel injection, the control unit simply retrieves the appropriate correction value from the characteristics map based on current operating conditions, avoiding time-consuming real-time calculations while maintaining reliable combustion quality
Solution Approach 2:
The system changes from real-time computational regulation to parameter-based lookup by storing correction values as a function of pressure and temperature. This approach maintains combustion quality by accounting for operating condition variations while eliminating the time loss associated with complex real-time regulation calculations
Data Source
AI summary
A method for activating an injector in a fuel injection system in an internal combustion engine, the fuel injection system including a plurality of injectors and a quantity of fuel injected with the aid of an injector being a function of the activation period of the injector. An injector-individual correction value for the activation period is ascertained for at least one injector as a function of a pressure and a temperature of the fuel to be injected and the activation for this injector takes place under consideration of the injector-individual correction value.