Fuel Injection Control Device Valve Closing Time Correction
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Solution Overview
Problem
The existing fuel injection control devices for internal combustion engines face challenges in reducing injection amount variation, particularly due to variations in valve closing behavior after energization is turned off, and struggle with maintaining optimal peak current values at high fuel pressures, leading to increased injection amount variation.
Innovation Solution
A fuel injection control device that includes a valve body operation time detection unit, a drive current correction unit, and an injection pulse width correction unit, which corrects drive current and energization time based on valve closing completion time, and selects the appropriate correction method based on engine state to minimize injection amount variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If drive current correction is executed to reduce injection amount variation in half lift region, then injection accuracy is improved, but injection amount variation after full lift increases due to valve closing behavior variation
Solution Approach 1:
The patent transitions from static drive current correction to dynamic correction by introducing valve closing completion time as a real-time parameter. The system dynamically adjusts drive current parameters based on the actual valve closing behavior detected during operation, enabling adaptation to varying engine states and fuel pressures.
Solution Approach 2:
The patent implements feedback control by detecting the valve closing completion time and using this information to correct drive current parameters. The detection unit monitors the actual valve closing behavior, and this feedback is fed back to the control unit to adjust the peak current value and energization time, creating a closed-loop control system that reduces injection amount variation.
2Measurement precision
If peak current value is reduced to minimize injection amount variation, then injection accuracy is improved, but valve opening reliability decreases at high fuel pressure
Solution Approach 1:
The patent applies preliminary action by detecting the valve closing completion time before executing the correction. The system uses this detected parameter to pre-calculate the appropriate peak current value that will ensure both reliable valve opening and minimal injection amount variation, rather than simply reducing the current.
Solution Approach 2:
The patent changes multiple parameters simultaneously - not only the peak current value but also the energization time - based on the detected valve closing completion time. This multi-parameter adjustment allows the system to maintain valve opening reliability while minimizing injection amount variation across different operating conditions.
3Reliability
If minimum guaranteed current value is increased to ensure valve opening at high fuel pressure, then valve opening reliability is improved, but injection amount variation increases
Solution Approach 1:
The patent makes the minimum guaranteed current value dynamic rather than fixed. By detecting the valve closing completion time, the system dynamically determines the appropriate peak current value needed for reliable valve opening at the current fuel pressure, eliminating the need to continuously increase the current to the maximum guaranteed value.
Solution Approach 2:
The system uses feedback from the valve closing completion time detection to adjust the peak current value. This feedback mechanism allows the control unit to determine the precise current level needed for reliable valve opening under current conditions, rather than using a conservatively high fixed value that would increase injection amount variation.
4Ease of operation
If correction method is fixed for all engine states, then control simplicity is maintained, but injection amount variation cannot be reduced across all operating conditions
Solution Approach 1:
The patent introduces dynamic selection of correction methods based on engine state. The control unit automatically selects the appropriate correction method (drive current correction, injection pulse width correction, or both) based on the detected valve closing completion time and current operating conditions, providing adaptive control without requiring complex manual intervention.
Solution Approach 2:
The system performs self-service by automatically selecting and executing the appropriate correction method based on detected engine state parameters. The control unit independently determines whether drive current correction, injection pulse width correction, or both are needed, eliminating the need for external intervention or complex operator decisions.
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 solution effectively reduces injection amount variation across multiple fuel injection valves by optimizing drive current and pulse width correction, improving injection accuracy and reducing unintended exhaust emissions regardless of engine state.
Implementation Method 1
a fuel injection valve (105) having a coil (407) for energization
Data Source
AI summary
An injection amount variation of a plurality of fuel injection valves is reduced regardless of a state of an engine. According to one aspect of the present invention, there is provided a fuel injection control device 127 that controls a plurality of fuel injection valves having a coil for energization, including a valve body operation time detection unit 211 that detects a valve closing completion time from an end of energization of the fuel injection valve to completion of valve closing of a valve body of the fuel injection valve, a drive current correction unit 213 that corrects a drive current parameter of the fuel injection valve based on the valve closing completion time, an injection pulse width correction unit 214 that corrects an energization time of the fuel injection valve based on the valve closing completion time, and a correction method selection unit 212 that selects at least one of the drive current correction unit 213 and the injection pulse width correction unit 214 to execute correction based on a state of an engine.