Common Rail Fuel Injection Control Device
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Solution Overview
Problem
The existing control systems for common rail fuel injection devices face issues with increased heat emission and potential engine damage due to simultaneous activation of flow rate regulating valves and pressure reducing valves, leading to improper regulation of common rail pressure.
Innovation Solution
A control device that prohibits simultaneous activation of the pressurized fuel feed pump and the pressure reducing valve by using separate drive controlling units to manage the electromagnetic driving units of the flow rate regulating valves and the pressure reducing valve, ensuring proper sequencing and timing of operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common drive circuit is used to control multiple electromagnetic driving units, then device complexity is reduced, but rated currents are not supplied to the electromagnetic driving units when activated simultaneously, leading to unreliable operation
Solution Approach 1:
The drive controlling unit is divided into multiple control channels, each responsible for controlling at least one electromagnetic driving unit. This segmentation allows independent control of each valve, ensuring that rated currents are supplied reliably to each electromagnetic driving unit without interference, while maintaining a relatively simple overall circuit architecture.
2Reliability
If flow rate regulating valves and pressure reducing valve are controlled independently with separate drive circuits, then reliability of control is improved, but device complexity and heat emission increase
Solution Approach 1:
The drive controlling unit is designed with multiple control channels that share common functional components and architecture. This multi-functional design allows a single drive controlling unit to reliably control multiple electromagnetic driving units simultaneously, achieving independent control reliability without the need for completely separate drive circuits for each valve.
3Loss of energy
If multiple electromagnetic driving units are controlled by a single drive circuit, then heat emission is reduced, but simultaneous activation cannot be achieved, leading to improper pressure regulation
Solution Approach 1:
The drive controlling unit is segmented into multiple independent control channels, each capable of independently activating electromagnetic driving units. This segmentation enables simultaneous activation of multiple valves while keeping the overall circuit structure compact and energy-efficient, thus reducing heat emission while maintaining proper pressure regulation.
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 solution effectively avoids simultaneous activation, allowing for reliable regulation of common rail pressure and preventing engine damage, while reducing the complexity of drive circuits and heat emission.
Implementation Method 1
Each of the flow rate regulating valves and the pressure reducing valve has an electromagnetic driving unit that includes a solenoid
Data Source
AI summary
A common rail fuel injection device includes first and second flow rate regulating valves for regulating a delivery volume of a pressurized fuel feed pump that feeds pressurized fuel to a common rail, a pressure reducing valve for reducing a common rail pressure, and a control device. The control device for the common rail fuel injection device includes a first drive controlling unit that controls a first electromagnetic driving unit for the second flow rate regulating valve and a second electromagnetic driving unit for the pressure reducing valve, and a second drive controlling unit that controls a third electromagnetic driving unit for the first flow rate regulating valve. The first drive controlling unit prohibits a drive instruction from being sent to the second flow rate regulating valve when the first drive controlling unit sends a drive instruction to the pressure reducing valve.