Fuel Injection Controller Dynamic Suction Force Adjustment
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Solution Overview
Problem
Existing fuel injection systems struggle to dynamically adjust the increasing rate of electromagnetic force according to the operation state of an internal combustion engine, limiting the ability to shorten injection delay time or reduce collision sounds between movable and fixed cores.
Innovation Solution
A fuel injection controller that controls the coil current to a first target value and holds it at that value, with the option to change this target value based on the engine's operation state, allowing for adjustable suction force rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the increasing rate of suction force is raised to shorten the delay time period, then the injection start time point is advanced, but the collision sound between movable core and fixed core is increased
Solution Approach 1:
The patent applies dynamics by making the increasing rate of suction force adjustable according to engine operation state. The controller dynamically changes the rate at which coil current is increased during the delay period, allowing optimization of the trade-off between injection timing and collision sound reduction based on real-time engine conditions.
Solution Approach 2:
The patent changes the parameter of coil current increase rate to control the suction force increasing rate. By varying this parameter according to engine operation state, the system can shorten the delay time period when needed while reducing collision sound during normal operation, resolving the technical contradiction.
2Productivity
If the voltage applied to the coil is changed to adjust the increasing rate of suction force, then the injection timing can be optimized, but the device complexity increases due to difficulty in varying voltage or resistance
Solution Approach 1:
The patent uses feedback control where the controller monitors engine operation state and adjusts the coil current increase rate accordingly. This feedback mechanism enables injection timing optimization without requiring complex voltage or resistance variation mechanisms, as the controller simply adjusts the rate of current increase based on real-time engine conditions.
Solution Approach 2:
The patent makes the coil current increase rate dynamic rather than static. The controller adjusts this rate based on engine operation state, enabling flexible injection timing optimization. This dynamic approach avoids the need for complex voltage or resistance variation mechanisms while achieving the desired control flexibility.
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
Enables flexible adjustment of suction force increasing rates to optimize injection timing and reduce collision sounds without altering the maximum suction force, improving engine responsiveness and reducing energy consumption.
Implementation Method 1
a fuel injector injecting fuel to be combusted in an internal combustion engine by an open-valve operation of the valve body according to an electromagnetic suction force generated by an energization of a coil
Data Source
AI summary
A fuel injection controller is applied to a fuel injector injecting fuel to be combusted in an internal combustion engine by an open-valve operation of the valve body according to an electromagnetic suction force generated by an energization of a coil. The fuel injection controller controls an injection state of the fuel injector by controlling a coil current flowing through the coil. The fuel injection controller includes an increasing control portion which increases the coil current to a first target value, a holding control portion which holds the coil current increased by the increasing control portion to the first target value, and a changing portion which changes the first target value according to the operation state of the internal combustion engine.