Solenoid Fuel Injection Timing Correction With Pause-Period Maps
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Solution Overview
Problem
Existing fuel injection control devices in internal combustion engines require significant arithmetic operations to calculate residual magnetic flux and voltage, leading to increased load during multiple fuel injections per combustion cycle.
Innovation Solution
An electromagnetic valve driving device that uses correction amount maps to adjust energization periods for a solenoid coil, reducing the need for real-time calculations by storing relationships between energization pause periods and correction amounts, allowing earlier setting of fuel injection timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If arithmetic operations are performed to calculate residual magnetic flux or estimate residual voltage for fuel injection correction, then injection accuracy is improved, but computational load increases significantly during multiple injections per combustion cycle
Solution Approach 1:
The patent pre-calculates and stores correction amounts for different energization pause periods in a correction amount map during the design phase. During actual operation, the control device only needs to lookup the pre-stored correction amount based on the current pause period, eliminating the need for real-time arithmetic operations to calculate residual magnetic flux or estimate residual voltage.
Solution Approach 2:
The patent creates a simplified copy of the complex physical relationships by storing correction amounts in a map structure that represents the relationship between energization pause periods and required corrections. This copy allows the system to bypass complex calculations by directly referencing the pre-stored correction data.
2Measurement precision
If real-time calculation of residual magnetic flux or residual voltage is performed, then correction accuracy is improved, but processing time increases during combustion cycles
Solution Approach 1:
The correction amounts are pre-calculated and stored in the correction amount map before the combustion cycles begin. During the actual fuel injection process, the control device only performs a simple lookup operation to retrieve the appropriate correction amount, dramatically reducing processing time while maintaining correction accuracy.
3Manufacturing precision
If complex arithmetic operations are performed for each fuel injection correction, then injection control precision is improved, but the number of arithmetic operations increases the controller load
Solution Approach 1:
The patent transfers the complex arithmetic operations from the runtime controller to the design phase, where correction amounts are pre-calculated and stored in the correction amount map. This shifts the computational burden from the operating controller to the initial system setup, significantly reducing the controller's operational load during fuel injection cycles.
Solution Approach 2:
The patent replaces the mechanical computation process (arithmetic operations in the controller) with a data lookup process (retrieving pre-stored correction amounts from the map). This substitution eliminates the need for complex real-time calculations while maintaining the precision required for injection 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
Reduces the computational load associated with fuel injection corrections by using pre-stored maps, thereby preventing increased arithmetic operations during multiple fuel injections.
Implementation Method 1
solenoid coil provided in a fuel injection valve
Implementation Method 2
calculates a magnetic flux remaining in a fuel injection valve
Data Source
AI summary
An electromagnetic valve driving device that controls an energization period to a solenoid coil provided in a fuel injection valve and causes the fuel injection valve to inject fuel a plurality of times during one combustion cycle of an internal combustion engine, the electromagnetic valve driving device includes: a storage that stores a correction amount map indicating a relationship between an energization pause period from a completion time of a first-half energization period, which is the energization period for a first fuel injection in the one combustion cycle, to a start time of a later-half energization period, which is the energization period for next fuel injection, and a correction amount for the later-half energization period; an energization period correction unit that obtains the correction amount from a command value of the energization pause period based on the correction amount map and corrects the later-half energization period based on the obtained correction amount; and an energization controller that energizes the solenoid coil based on a later-half correction energization period that is the later-half energization period corrected by the energization period correction unit.