Fuel Injection Control Device Temperature Compensation
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Solution Overview
Problem
Existing injection control devices for internal combustion engines face challenges in maintaining accurate fuel injection due to variations in peripheral temperature environments, leading to deviations in energization current gradients, which can result in suboptimal fuel injection quantities.
Innovation Solution
An injection control device that executes current area correction based on the integrated value of the energization current, with the controller adjusting the energization time to match the integrated current value, and further adjusts this correction based on the cooling water temperature of the engine to maintain precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If current area correction is executed to maintain accurate fuel injection, then fuel injection accuracy is improved, but device complexity increases due to additional control calculations
Solution Approach 1:
The patent changes the control parameter from fixed energization time to variable energization time based on integrated current value. The controller calculates the integrated current value during energization and adjusts the energization time dynamically to compensate for gradient deviations, thereby maintaining injection accuracy without requiring complex additional hardware
Solution Approach 2:
The patent implements feedback control by monitoring the integrated current value during energization and using this information to correct the energization time. The controller continuously adjusts the energization parameters based on the actual current profile, creating a closed-loop control system that maintains accuracy while using existing sensor data
2Reliability
If fixed abnormality determination value is used for area correction, then device complexity is reduced, but reliability decreases due to temperature-induced gradient variations
Solution Approach 1:
The patent transitions from a static abnormality determination value to a dynamic determination value that changes with cooling water temperature. The controller adjusts the abnormality determination value based on temperature conditions, allowing the system to adapt to varying operating environments and maintain reliable operation across different temperature ranges
Solution Approach 2:
The patent changes the abnormality determination value as a function of cooling water temperature. By adjusting this parameter dynamically based on temperature, the system maintains appropriate sensitivity for detecting actual abnormalities while accounting for normal temperature-induced variations in the energization current gradient
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 ensures accurate fuel injection quantities by compensating for temperature-induced deviations in energization current gradients, thereby improving fuel efficiency and reducing harmful emissions.
Implementation Method 1
a solenoid coil 2a that drives a needle valve 2b
Data Source
AI summary
An injection control device includes: a fuel injection quantity command value output unit that outputs a command value for a fuel injection quantity of a fuel injection valve; and a controller that executes current control on the fuel injection valve. The controller executes current area correction by calculating an area correction amount for an energization time to cause an integrated current value of an energization current profile and the integrated current value of a current to be equal to each other. Correction control of the current area correction is changed based on a detection signal of a cooling water temperature of an internal combustion engine.