Engine Torque Monitoring via Dual Calculation Selection
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Solution Overview
Problem
Existing engine torque monitoring technologies fail to accurately detect torque deviations due to inaccuracies in injection pressure detection and calculation, leading to potential undetected engine torque exceeding allowable limits.
Innovation Solution
An engine control system that calculates actual torque using multiple operating state parameters, such as intake air amount and throttle opening, and selects the largest value between two calculated torques to ensure accurate detection and limit engine actuation when the actual torque exceeds allowable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If actual torque is calculated based on injection pressure detection, then torque monitoring capability is provided, but measurement precision deteriorates due to detection inaccuracies and calculation troubles
Solution Approach 1:
The patent divides the actual torque calculation into two separate calculation methods: one based on injection pressure detection and another based on engine operating parameters (intake air amount, engine speed, throttle opening). Each method is independently executed and then compared to select the more reliable result, thereby segmenting the calculation process to avoid the weaknesses of any single method.
Solution Approach 2:
The system implements a feedback mechanism where the results from both calculation methods are continuously compared. When the difference between the two calculated torque values exceeds a predetermined threshold, the system identifies this as an abnormal state and uses the larger value for monitoring, providing feedback that improves the overall measurement precision and reliability.
2Device complexity
If single calculation method is used for actual torque, then device complexity is reduced, but reliability deteriorates due to undetected calculation troubles
Solution Approach 1:
The patent merges two different torque calculation approaches into a unified monitoring system. By combining the injection pressure-based calculation with the engine parameter-based calculation, the system achieves higher reliability without significantly increasing complexity, as both calculations use existing sensor data and the selection logic is straightforward.
Data Source
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AI summary
An engine control device sets a target torque of an engine, and controls an engine torque based on the set target torque. An allowable torque greater than the target torque is set, and a plurality of different operating state parameters is detected as indicators indicating an actual operating state of the engine. Actual torques, which are the actual engine torques, are individually calculated based on the plurality of detected operating state parameters, and the largest value among the calculated actual torques is selected as a final actual torque. The selected actual torque is compared to the allowable torque to generate a control signal according to the result of comparison between the actual torque and the allowable torque.