Fuel Injection Drive Device Combining Pulse Widths for Half Lift Accuracy
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Solution Overview
Problem
Existing fuel injection systems face challenges in achieving high accuracy for fuel injection amounts, particularly in half lift states where the fuel injection amount is not accurately controlled by variations in injection pulse widths.
Innovation Solution
A drive device for a fuel injection system that combines fuel injections with multiple pulse widths to approximate a target injection amount, incorporating a control mechanism that adjusts energizing times and valve operations to improve accuracy, especially in half lift states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fuel injection is performed in half lift state to achieve precise control, then control precision is improved, but manufacturing precision deteriorates because the injection amount is not linearly changed with injection pulse width
Solution Approach 1:
The fuel injection process is divided into multiple injection pulses with different pulse widths. Instead of using a single injection pulse, the system performs multiple injections (e.g., first injection with pulse width T1, second injection with pulse width T2) to achieve the target injection amount. This segmentation allows the system to overcome the non-linear relationship between single pulse width and injection amount in half lift state by combining multiple linear regions.
Solution Approach 2:
The system changes the parameter of injection pulse width across multiple injections. By varying the pulse width from T1 to T2 (or other combinations), the system can operate in different regions of the valve lift characteristic. This parameter variation enables the combination of injections to approximate the target amount even when individual injections operate in non-linear regions.
2Manufacturing precision
If multiple division injections are performed to improve accuracy, then injection amount accuracy is improved, but device complexity increases
Solution Approach 1:
The existing fuel injection valve and control system are made to perform multiple functions. The same valve structure is used for both single injection and multiple division injections. The control unit adapts the existing hardware to perform multiple injections by simply varying the pulse width timing and duration, without requiring additional injection valves or complex mechanical structures.
Solution Approach 2:
The system uses periodic injection pulses with different widths to achieve the target injection amount. Instead of a single continuous action, multiple periodic pulses (first injection pulse with width T1, second injection pulse with width T2) are applied in sequence. This periodic action with varying parameters enables precise control while utilizing the existing periodic nature of fuel injection systems.
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 solution enhances the accuracy of fuel injection by integrating full lift and half lift operations, allowing for precise control of injection amounts across multiple division injections, thereby improving the overall fuel efficiency and engine performance.
Implementation Method 1
a solenoid 105...generating a magnetic field to move a valve element 114
Data Source
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AI summary
An object of the invention is to provide a drive device of a fuel injection device which can increase the accuracy in an injected fuel injection amount by combining the fuel injections from a plurality of injection pulse widths. In the drive device of the fuel injection device which has a function of driving the fuel injection device such that the fuel injection is performed plural times in one combustion cycle, the fuel injection device is driven such that a fuel injection at a target opening level in which a valve element or a movable element of the fuel injection device reaches a regulation member and a fuel injection at an intermediate opening level in which the valve element does not reach the regulation member are included in the plural times of division injections performed in one combustion cycle.