Cylinder-Wall Sensor Feedback for Variable Compression Piston Control
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Solution Overview
Problem
Existing reciprocating piston engines with variable compression ratios face challenges in accurately determining and adjusting piston position and compression ratio, particularly due to complexities in crankshaft angles and piston movement, which affects engine performance and efficiency.
Innovation Solution
The implementation of sensors, such as inductive sensors, arranged in the cylinder wall to detect the relative movement between the piston skirt and the cylinder wall, allowing for the determination of motion parameters, piston position, and piston speed, enabling precise calculation of the compression ratio and adjustment of the piston rod length to achieve desired compression ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are arranged in the cylinder wall to detect piston movement, then measurement precision of piston position is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensor functions into a single integrated sensor arrangement in the cylinder wall. The sensor simultaneously detects piston position, piston speed, and compression ratio data, eliminating the need for multiple separate measurement systems and reducing overall device complexity while maintaining high measurement precision.
Solution Approach 2:
The sensor arrangement acts as an intermediary element between the piston movement and the control system. By positioning the sensor in the cylinder wall, it indirectly measures piston parameters through detecting changes in the electromagnetic field or optical properties as the piston moves, providing accurate measurements without direct mechanical contact that would complicate the system.
2Adaptability or versatility
If variable compression ratio is implemented, then adaptability to different load ranges is improved, but control complexity increases
Solution Approach 1:
The patent implements a dynamically adjustable compression ratio system where the compression ratio can be changed in real-time based on operating conditions. The piston rod length is variable, allowing the compression ratio to be adapted to different load ranges dynamically rather than being fixed, thereby improving versatility without requiring multiple engine designs.
Solution Approach 2:
The system incorporates feedback control where sensors continuously monitor piston position and compression ratio, and this information is fed back to the control unit. The control unit automatically adjusts the compression ratio based on the detected parameters, simplifying the control process by using automated feedback loops rather than manual intervention or complex mechanical linkages.
3Adaptability or versatility
If piston rod length is adjusted to change compression ratio, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system uses self-adjusting mechanisms where the piston rod length is modified based on real-time sensor feedback rather than requiring precise pre-manufacturing of multiple rod lengths. The adjustment mechanism allows the system to self-regulate the compression ratio by extending or retracting the piston rod as needed, reducing the need for high-precision manufacturing of different rod variants.
Solution Approach 2:
The patent changes the physical parameter of piston rod length in a controlled manner to achieve different compression ratios. By using an adjustable mechanism that can modify the rod length continuously or in discrete steps, the system achieves adaptability without requiring extremely precise manufacturing tolerances for each possible rod length, as the adjustment can be made after manufacturing with standard tolerances.
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 improved accuracy in determining piston position and compression ratio, allowing for optimized engine performance across different load ranges and enhancing diagnostic and control capabilities, leading to more efficient engine operation and reduced maintenance needs.
Implementation Method 1
a first sensor (6) which is arranged in a cylinder wall (7) of the at least one cylinder (2a, 2b, 2c, 2d) and which is arranged to detect a relative movement between a piston skirt (8) of the piston (3) and the cylinder wall (7)
Data Source
AI summary
The invention relates to a reciprocating piston machine, in particular with a variable compression ratio, of at least one cylinder with a piston and a connecting rod which is connected to the piston and to a crankshaft of the reciprocating piston machine. The reciprocating piston machine also has a first sensor which is arranged in a cylinder wall of the at least one cylinder and is configured to detect relative movement between a piston skirt of the piston and the cylinder wall. The invention further relates to a method (100) for diagnosing and/or controlling such a reciprocating piston machine (1), in particular with a variable compression ratio, and a system which is suitable therefor.