Piezo Injection Valve Bounce Detection via Dynamic Coupling
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Solution Overview
Problem
Existing injection valves for internal combustion engines face challenges in achieving high injection accuracy due to stringent emission regulations, requiring improved mechanisms to precisely control fluid flow.
Innovation Solution
The injection valve incorporates a piezoelectric actuator mechanically coupled to a needle body via transmitters, allowing for detection and regulation of mechanical bounce events to optimize the opening and closing positions, thereby enhancing injection accuracy across various operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the needle body is mechanically coupled to the piezoelectric actuator for detection, then injection accuracy is improved through bounce detection, but device complexity increases due to additional coupling mechanisms
Solution Approach 1:
The piezoelectric actuator serves dual functions: it actuates the control valve through electrical discharge and simultaneously detects mechanical bounce events through mechanical coupling with the needle body. This multi-functionality allows bounce detection without adding separate sensing components, thereby improving injection accuracy while minimizing the increase in device complexity.
Solution Approach 2:
A second transmitter is introduced as an intermediary mechanical element between the needle body and the piezoelectric actuator. This transmitter facilitates the mechanical coupling required for bounce detection while allowing controlled disengagement when the predefined open position is reached, enabling accurate bounce detection without permanent mechanical attachment that would overly complicate the system.
2Measurement precision
If the piezoelectric actuator is continuously coupled to the needle body, then bounce detection is improved, but mechanical bounce is produced at the predefined open position
Solution Approach 1:
The mechanical coupling between the piezoelectric actuator and the needle body is made dynamic rather than static. The second transmitter enables the coupling to be established when needed (at closed position and predefined open position) and disengaged when the needle reaches the predefined open position. This dynamic coupling allows bounce detection at critical moments while preventing harmful mechanical bounce during normal operation.
Solution Approach 2:
The mechanical coupling is activated periodically at specific phases of the injection cycle - when the closed position is reached and when the predefined open position is reached - rather than being continuously active. This periodic engagement enables bounce detection at these critical transition points without creating continuous mechanical interference that would generate unwanted bounce.
3Measurement precision
If regulation based on bounce times is implemented, then injection accuracy is enhanced, but control system complexity increases
Solution Approach 1:
The system implements feedback control by detecting the times of mechanical bounce events through the piezoelectric actuator and using these detected times to regulate the injection valve operation. The control unit processes the bounce timing information and adjusts subsequent injection cycles accordingly, creating a closed-loop feedback system that enhances injection accuracy without requiring complex external regulation equipment.
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 enables precise regulation of injection timing, achieving high injection accuracy by utilizing the detected bounce times to control the valve's operation, particularly in full stroke, part stroke, and boost injection modes.
Implementation Method 1
a piezoelectric actuator which is coupled mechanically to the control valve via a first transmitter for opening the control valve
Implementation Method 2
Mechanical bounce can be detected by means of the piezoelectric actuator as a result of the mechanical coupling of the needle body to the piezoelectric actuator
Data Source
AI summary
The present disclosure relates to an injection valve comprising an injector body, a needle body, a control space, a control valve, and a piezoelectric actuator. The injector body has a recess and a fluid inflow and a fluid outflow. The needle body is arranged axially movably in the recess of the injector body and suppresses a fluid flow through an injection opening of the injector body in a closed position of the needle body and otherwise releases it. The control space is disposed in the recess between the fluid inflow and the fluid outflow. The control valve may be arranged in the control space to suppress a fluid flow between the control space and the fluid outflow in a closed position of the valve body and to otherwise release it. The piezoelectric actuator may be coupled mechanically to the control valve via a first transmitter for opening the control valve.