Fuel Injection Device Single Energization Divided Control
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Solution Overview
Problem
Conventional fuel injection devices require multiple energization sessions for divided fuel injection, leading to increased energy consumption and inefficiency in engine control.
Innovation Solution
A fuel injection device with a flange portion and regulating unit that allows for a gap formation between the flange and movable core, enabling multiple fuel injections during single energization by controlling the current through the coil, reducing energy consumption and enabling efficient divided fuel injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple energization sessions are performed for divided fuel injection, then fuel injection control accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent maintains magnetic flux in the coil throughout the entire duration from preliminary energization through main energization, eliminating the need to recharge the magnetic field between injection events. This continuous magnetic flux allows multiple fuel injections (divided injection) to occur during a single energization cycle, thereby improving control accuracy while reducing energy consumption compared to conventional methods that require complete energization cycles for each injection.
2Adaptability or versatility
If continuous energization is performed for multiple fuel injections, then divided injection function is achieved, but energy consumption increases
Solution Approach 1:
The patent performs preliminary energization before the needle separates from the valve seat and maintains magnetic flux throughout the main energization phase. This continuous magnetic field allows the system to perform divided fuel injection (improving adaptability) without requiring multiple separate energization sessions, thereby avoiding the increased energy consumption that would result from repeated energization cycles.
3Manufacturing precision
If preliminary energization and main energization are performed separately, then fuel injection timing is improved, but energy consumption increases
Solution Approach 1:
The patent performs preliminary energization to position the needle near the valve seat, then maintains magnetic flux during the transition to main energization without interrupting the magnetic field. This continuous magnetic flux preserves precise injection timing control while eliminating the energy waste associated with recharging the coil between preliminary and main energization phases.
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 device achieves reduced energy consumption and efficient multiple fuel injections during single energization, improving engine control and fuel distribution, while minimizing electrical energy charging requirements and preventing cooling losses.
Implementation Method 1
a current control unit that performs main energization and preliminary energization, the main energization being to cause a current to flow through a coil so that the needle is separated from a valve seat
Implementation Method 2
a biasing unit, and a current control unit
Data Source
AI summary
A current control unit in a fuel injection device controls a magnitude of a current flowing through a coil during single energization. A current Ip1 flows once a signal input to the current control unit is turned ON at time t11. As a result, a movable core and a needle abut against each other with a lift amount increased at time t12, and then the needle is separated from a valve seat and pre-injection is performed. At time t13, which follows the pre-injection, the needle and movable core lift amount becomes a lift amount D1 at a time when the needle and the valve seat abut against each other, and temporary valve closing occurs. At time t14, which follows time t13, currents Ix1 and Im1 larger than the current Ip1 are caused to flow through the coil, and then main injection is performed with the needle and movable core lift amount turned into a lift amount D2 larger than the lift amount D1. Therefore, fuel injection can be performed twice during the single energization.