Engine Position Detection Using Speed Signal Patterns
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Solution Overview
Problem
Current methods for determining the position of a combustion engine's cylinders in internal combustion engines are inaccurate and require additional sensors and complex algorithms, limiting torque and increasing costs, especially in two-wheeler systems with single or multiple cylinders.
Innovation Solution
A procedure that uses the engine speed signal, specifically highlighting the significant change during the compression phase, to determine the engine position without additional sensors, generating a signal pattern that synchronizes the software with the mechanical engine position, allowing for precise injection and ignition timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor wheels and additional sensors are used to determine engine position, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential information needed for engine position detection from the existing engine speed signal, rather than adding new sensors. By analyzing the natural variations in engine speed during different strokes (intake, compression, power, exhaust), the system identifies characteristic patterns that indicate cylinder position without requiring additional hardware.
Solution Approach 2:
The existing engine speed signal, which is already present in the control unit for other functions, is repurposed to provide engine position information. The system uses the natural self-characteristics of the engine operation (speed variations during different strokes) to generate position data, making the existing signal serve multiple functions.
2Measurement precision
If additional sensors and complex algorithms are implemented, then engine position determination accuracy is improved, but manufacturing costs increase
Solution Approach 1:
The engine speed signal is used for multiple purposes: it provides both the basis for calculating engine position and serves as the primary operational parameter for engine control. This multi-functional use of existing data eliminates the need for dedicated position detection hardware, reducing manufacturing costs.
Solution Approach 2:
Instead of investing in expensive, durable additional sensors, the patent uses the already-available engine speed signal that is continuously generated during normal operation. This approach leverages existing inexpensive data sources rather than adding costly hardware components.
3Reliability
If crankshaft backup mode is used with limited accuracy, then reliability is improved through redundancy, but productivity decreases due to torque limitation
Solution Approach 1:
The system continuously monitors the engine speed signal for characteristic patterns that indicate accurate position detection. By providing feedback on the quality and reliability of the detected position information, the system can determine when full power operation is safe and when backup modes are necessary, optimizing the balance between reliability and productivity.
4Ease of operation
If software synchronization procedures are implemented, then ease of operation is improved, but loss of time occurs during engine start-up
Solution Approach 1:
The system performs preliminary analysis of the engine speed signal patterns during the start-up process to quickly establish software synchronization with engine position. By identifying characteristic speed variations during the initial operation, the system achieves synchronization faster than traditional methods, reducing start-up time while maintaining ease of operation.
Data Source
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AI summary
The invention relates to a method for determining a position of an internal combustion engine, which comprises at least one cylinder. According to said method, a signal time-function of a speed signal that represents a speed of the internal combustion engine is detected and a signal (100) is generated on the basis of the signal time-function of the speed signal by performing at least one summation, and a signal pattern (108) is identified in the signal time-function of the generated signal (100) by way of which the position of the engine is determined.