Fuel Injection Valve Cylinder Pressure Sensor Integration
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Solution Overview
Problem
Existing fuel injection valves with internal pressure sensors face issues of disconnection due to external loads and noise interference from engine vibrations, affecting detection accuracy.
Innovation Solution
A fuel injection valve with a built-in cylinder internal pressure sensor featuring a signal transmitting member that includes an amplifying unit, where the amplifying unit is a circuit body molded with resin and connected to a coil assembly, enhancing assembly reliability and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lead line is connected to the internal pressure sensor and electronic control unit, then the detection signal can be transmitted, but the lead line is exposed to the exterior and may disconnect due to external loads
Solution Approach 1:
The patent merges the lead line connection into the fuel injection valve body structure. The signal transmitting member is integrated within the valve housing, eliminating external lead lines. The amplifier unit is mounted on the valve body with direct electrical connections, combining multiple functions (sensing, amplification, and signal transmission) into a single integrated assembly that eliminates disconnection risks from external loads.
2Measurement precision
If the internal pressure sensor is arranged in contact with the cylinder head, then the sensor can detect cylinder internal pressure, but noise is easily generated due to vibrations
Solution Approach 1:
The patent introduces an intermediary mounting structure for the amplifier unit. Instead of directly mounting the sensor to the cylinder head, the amplifier unit serves as an intermediary component that is mounted on the valve body. This intermediary structure provides mechanical isolation and electrical connection without direct contact between the sensor and the noisy cylinder head, reducing vibration noise while maintaining detection capability.
3Measurement precision
If the amplifying unit is provided to amplify the detection signal, then detection accuracy increases, but the assembly complexity increases
Solution Approach 1:
The patent combines the amplifier unit with the fuel injection valve assembly. The amplifier unit is mounted on the valve body and integrated into the existing structure, merging the amplification function with the valve assembly rather than adding a separate, independent amplification system. This integration reduces overall system complexity while maintaining the signal amplification capability needed for accurate detection.
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 ensures reliable assembly and improved detection accuracy by amplifying signals and reducing noise, preventing disconnections and enhancing the precision of cylinder internal pressure detection.
Implementation Method 1
a drive unit configured to drive a valve element by energizing a coil assembly including a coil
Implementation Method 2
the signal transmitting member includes an amplifying unit configured to amplify and output the detection signal
Data Source
AI summary
Within a resin mold portion of a fuel injection valve, an amplifying member having a substrate is provided. An engagement hole that penetrates in an axial direction is formed in another end part of the amplifying member, and an engagement pin, which is formed on a bobbin of a housing, is inserted through the engagement hole. A second connector of a second signal transmitting member, which constitutes part of a signal transmitting unit, is inserted from below into a connecting hole formed in the substrate. In addition, when the resin mold portion is molded, the amplifying member is retained in a state with the engagement pin and the second connector being inserted, respectively, into the engagement hole and the connecting hole.