Engine Torque Monitoring via Reserve Torque Computation
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Solution Overview
Problem
Internal combustion engine control systems face challenges in accurately monitoring torque anomalies without relying on ignition signal detection, leading to increased processing loads and potential errors in estimating actual torque.
Innovation Solution
The system computes a reserve torque to estimate the engine required torque based on user required torque, eliminating the need for ignition signal detection and using separate storage areas for control and monitoring units to enhance data robustness and reduce processing loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ignition signal detection is used to estimate actual torque, then measurement precision is improved, but device complexity and processing load increase
Solution Approach 1:
The patent extracts the torque anomaly detection function from the control arithmetic unit and implements it in a separate monitoring arithmetic unit. This separation allows the control unit to focus on control computations while the monitoring unit independently monitors torque anomalies using a simplified estimation method that does not require ignition signal detection, thereby reducing processing load on the control unit while maintaining monitoring capability
Solution Approach 2:
The monitoring arithmetic unit creates a simplified copy of the torque estimation function, computing estimated torque based on basic engine parameters (intake air quantity, engine speed) without requiring complex ignition signal processing. This copy performs sufficient for anomaly detection purposes while significantly reducing computational complexity
2Reliability
If separate storage areas are used for control and monitoring units, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the storage architecture into distinct control storage area and monitoring storage area, each dedicated to specific functions. The control storage area holds data for control computations while the monitoring storage area holds data for torque anomaly monitoring. This segmentation prevents data corruption in one area from affecting the other, enhancing overall system reliability through functional isolation
Solution Approach 2:
The patent introduces an intermediary data transfer mechanism between the control and monitoring units, where only essential data (engine parameters needed for torque estimation) is transferred through defined interfaces. This intermediary layer protects against data corruption propagation while maintaining necessary data flow for monitoring functions
Data Source
AI summary
A control arithmetic unit uses a control storage area and computes a target control amount for combustion of an internal combustion engine according to a user required torque. A monitoring arithmetic unit uses a monitoring storage area and performs computation and monitoring of presence or absence of a torque anomaly state in which an estimated torque is deviated from an engine required torque by a predetermined amount or more. The monitoring arithmetic unit includes an engine required torque computation unit that computes the engine required torque and an estimated torque computation unit that computes the estimated torque. The engine required torque computation unit computes a reduction in an actual torque, which is caused in conjunction with a retard in ignition timing of the internal combustion engine, as a reserve torque and computes the engine required torque based on the calculated reserve torque and the user required torque.