Integrated In-Cylinder Pressure Sensor for Fuel Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-cylinder pressure detecting apparatuses face challenges in workability and interference from actuation signals when mounting pressure detecting elements on fuel injection valves, and there is a need to integrate the pressure detecting unit with the fuel injection device to enhance these aspects.
Innovation Solution
An in-cylinder pressure detecting apparatus is integrated with the fuel injection device, featuring a pressure detecting element mounted on the tip portion, an amplifying circuit unit, and a connecting member, which reduces the influence of actuation signals and improves workability by allowing the amplifying circuit to be disposed near the pressure detecting element, with a configuration that includes a sensor fixing member, connecting terminals for actuation and detection signals, and a failure detection circuit for diagnosing connectivity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure detecting element is mounted on the tip-portion of the fuel injection valve, then the measurement precision is improved, but the device complexity increases due to integration requirements
Solution Approach 1:
The patent combines the pressure detecting element, amplifying circuit unit, and connecting member into an integrated in-cylinder pressure detecting unit that is mounted on the fuel injection device. This merging of components resolves the technical contradiction by achieving accurate pressure measurement through tip-portion mounting while managing device complexity through functional integration rather than separate component assembly.
2Reliability
If the amplifying circuit is disposed near the pressure detecting element, then the influence of actuation signals is reduced, but the ease of manufacture decreases due to integration complexity
Solution Approach 1:
The amplifying circuit unit is integrated with the pressure detecting element through a connecting member, placing them in close proximity. This merging reduces the influence of actuation signals from the fuel injection device on the pressure detection signals, thereby improving reliability while managing manufacturing complexity through a standardized integrated assembly approach.
Solution Approach 2:
The integrated unit is designed as a separate module that can be manufactured and tested independently before being mounted on the fuel injection device. This segmentation allows for specialized manufacturing of the sensitive detection components while maintaining ease of assembly through a modular mounting process.
3Productivity
If the in-cylinder pressure detecting unit is integrated with the fuel injection device, then the productivity is improved through single-unit mounting, but the device complexity increases
Solution Approach 1:
The in-cylinder pressure detecting unit is integrated with the fuel injection device as a single assembly, allowing both components to be mounted simultaneously on the combustion chamber. This merging improves productivity by reducing the number of mounting operations from two separate installations to one unified mounting process, while the integration is designed to manage complexity through functional consolidation.
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 configuration enhances workability during mounting, reduces the influence of actuation signals on pressure detection, and ensures accurate pressure detection by integrating the pressure detecting unit with the fuel injection device, improving handling and reducing the overall size of the apparatus.
Implementation Method 1
a pressure detecting element (2) mounted on a tip-portion of a fuel injection device (1)
Implementation Method 2
an amplifying circuit unit (11) having an amplifying circuit which amplifies changes in the voltage of the pressure detecting element to output a pressure detection signal
Data Source
AI summary
An in-cylinder pressure detecting apparatus for detecting a pressure in a combustion chamber of an internal combustion engine is provided. The in-cylinder pressure detecting apparatus comprises a pressure detecting element mounted on a tip-portion of a fuel injection device which injects fuel into the combustion chamber, and an amplifying circuit unit having an amplifying circuit which amplifies a signal output from the pressure detecting element and outputs a pressure detection signal. An in-cylinder pressure detecting unit integrated fuel injection device is configured by integrating an in-cylinder pressure detecting unit with the fuel injection device. The in-cylinder pressure detecting unit includes the pressure detecting element, the amplifying circuit unit, and a connecting member connecting the pressure detecting element with the amplifying circuit unit. The in-cylinder pressure detecting unit integrated fuel injection device is mounted on the internal combustion engine.