Fuel Injection Valve Control System for Delay Compensation
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Solution Overview
Problem
Existing control systems for internal combustion engines fail to accurately reflect the valve-closing delay time period of individual fuel injection valves, leading to control errors in fuel injection and air-fuel ratio, which degrade exhaust emission characteristics and fuel economy performance.
Innovation Solution
A control system that includes initial value-specific control to acquire and reflect the valve-closing delay time period of each fuel injection valve, using initial value acquisition conditions and learned values to calculate the valve-opening time period, thereby improving control accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If standard fuel injection valve maps are used for control, then device complexity is reduced, but manufacturing precision of individual valves cannot be compensated leading to control errors
Solution Approach 1:
The system changes the control parameter from fixed standard maps to dynamically adjusted parameters based on learned valve-specific characteristics. The control ECU learns and stores individual valve-closing delay time periods, then uses these customized parameters to compensate for manufacturing variations in each fuel injection valve, thereby improving precision without significantly increasing system complexity.
Solution Approach 2:
The system implements a feedback mechanism where the control ECU measures the actual valve-closing delay time period for each fuel injection valve, compares it with standard values, and adjusts the energization time accordingly. This closed-loop feedback allows the system to compensate for individual valve variations and achieve precise fuel injection control.
2Measurement precision
If individual valve characteristics are measured and compensated, then fuel injection control accuracy is improved, but measurement and detection difficulty increases
Solution Approach 1:
The system uses the fuel injection valve's own operation during normal engine running to generate the measurement data needed for calibration. The control ECU measures the valve-closing delay time period by monitoring the valve's actual behavior during regular fuel injection events, eliminating the need for separate external measurement equipment or specialized testing procedures.
Solution Approach 2:
The system performs preliminary learning and measurement of individual valve characteristics during initial system operation or maintenance periods. The control ECU accumulates measurement data and establishes customized control parameters in advance, so that subsequent fuel injection operations can proceed with high precision using pre-calibrated values without requiring continuous complex measurements.
3Ease of operation
If valve-closing delay variation is not compensated, then control system simplicity is maintained, but fuel economy performance and emission characteristics deteriorate
Solution Approach 1:
The system adjusts the energization time parameter based on learned individual valve characteristics to achieve precise fuel injection control. By optimizing this parameter for each valve, the system improves fuel economy and emission characteristics while maintaining operational simplicity through automated learning and calibration processes.
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 system effectively improves the control accuracy of fuel injection and air-fuel ratio, enhancing exhaust emission characteristics and fuel economy performance by accurately accounting for the valve-closing delay time period of each fuel injection valve.
Implementation Method 1
a valve-closing delay time period occurs from when a command for closing the fuel injection valve is delivered to the fuel injection valve to when the fuel injection valve is actually closed
Implementation Method 2
in the maps M1 to M3, the elastic coefficient of a spring of each fuel injection valve is set to that of a spring of a standard nominal product of fuel injection valve
Data Source
AI summary
A control system for an internal combustion engine, which is capable of controlling fuel injection valves while causing valve-closing delay time periods, which occur with the valves actually mounted on the engine, to be reflected thereon, thereby making it possible to improve exhaust emission characteristics and fuel economy performance. The ECU of the control system performs initial value-specific control in fuel injection control and ignition timing control, such that initial value acquisition conditions are satisfied, so as to calculate the initial values of the valve-closing delay time periods when the initial value acquisition conditions are satisfied. When normal-time control is performed, the valve-opening time periods of the valves are calculated using the initial values of the valve-opening time periods, and the valves are controlled to be open over the valve-opening time periods.