Reconstituted Crankshaft Signal for Engine Control Synchronization
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Solution Overview
Problem
Current methods for controlling four-stroke internal combustion engines require complex and costly synchronization operations for precise engine position determination, leading to increased calculation demands and potential operational risks due to independent synchronization in the engine control unit and valve control unit.
Innovation Solution
A method and device that generate a reconstituted crankshaft signal, allowing for a single synchronization operation in the engine control unit, which is then transmitted via a communication bus to other control units, simulating a virtual sensor to provide precise instantaneous engine position information, reducing calculation resources and simplifying electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single synchronization operation is performed in the engine control unit and the result is transmitted to other control units via communication bus, then device complexity and calculation resources are reduced, but measurement precision and reliability of engine position information may be compromised
Solution Approach 1:
The patent creates a virtual sensor that generates a reconstituted crankshaft signal by copying and processing the main pulse and secondary pulses from the actual crankshaft sensor. This virtual copy is then transmitted to the valve control unit, eliminating the need for a second physical sensor and synchronization operation while maintaining measurement precision through careful signal reconstruction algorithms.
Solution Approach 2:
The patent introduces a communication bus as an intermediary to transmit the reconstituted crankshaft signal from the engine control unit to the valve control unit. This intermediary allows the single synchronization result to be shared across multiple control units, reducing the need for duplicate synchronization operations and associated complexity.
2Measurement precision
If independent synchronization operations are performed in both the engine control unit and valve control unit, then measurement precision is maintained, but device complexity and calculation resources increase
Solution Approach 1:
The engine control unit performs a universal synchronization operation that serves both the engine control unit and the valve control unit. The reconstituted crankshaft signal generated by the engine control unit is transmitted to the valve control unit, allowing a single synchronization operation to fulfill the needs of both control units and eliminating redundant operations.
3Ease of operation
If a virtual sensor is implemented to transmit reconstituted crankshaft signal, then ease of operation and system simplification are achieved, but reliability may be affected due to signal reconstruction
Solution Approach 1:
The virtual sensor creates a reconstituted crankshaft signal by copying the essential features of the actual sensor signal - specifically the main pulse corresponding to the reference tooth and secondary pulses for other teeth. By carefully reconstructing these pulse patterns and transmitting them through the communication bus, the system achieves both simplification and maintained reliability.
Data Source
AI summary
A method and device for controlling a four-stroke internal combustion engine, including a step of producing a reconstituted crankshaft signal having an electrical signal extending over two crankshaft revolutions in the nominal direction of rotation of the engine, the electrical signal including: a single main pulse, having a predetermined first duration, corresponding to the passing of a predetermined reference tooth of the toothed wheel associated with the crankshaft of the engine; a plurality of secondary pulses, each having a predetermined second duration, each corresponding to the passing of a tooth of the toothed wheel associated with the crankshaft of the engine; the predetermined first duration being greater than the predetermined second duration.