Engine Torque Determination With AFR and Transient Delay Compensation
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Solution Overview
Problem
Existing methods for determining internal combustion engine torque lack accuracy and reliability, particularly during transient engine operation, and fail to effectively account for factors like air-fuel ratio, engine acceleration, transport delay, and powertrain inertia.
Innovation Solution
A system comprising an electronic control system that determines engine torque values by accounting for air-fuel ratio, engine acceleration, transport delay, and powertrain inertia, using a combination of lookup tables, filters, and adjustment blocks to provide accurate torque calculations and control driveline components such as clutches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing torque determination methods are used, then the system is simple, but the accuracy of torque determination deteriorates during transient engine operation
Solution Approach 1:
The control system is segmented into multiple functional blocks: a base torque determination block that calculates steady-state torque, a transient compensation block that accounts for inertial effects, and an integration block that combines both. This segmentation allows the system to maintain high accuracy during transient operations while keeping each individual block relatively simple and manageable.
Solution Approach 2:
The system performs preliminary determination of base torque values under steady-state conditions using lookup tables and standard calculations. These pre-calculated values are then adjusted during transient operations by adding compensation terms for inertial effects. This preliminary action approach allows the system to maintain accuracy without requiring complete recalculation during dynamic conditions.
2Reliability
If existing torque determination methods are used, then the device complexity is low, but the reliability of torque values deteriorates
Solution Approach 1:
The control system continuously monitors engine operating conditions including crankshaft speed, accelerator pedal position, and actual engine load. It uses this feedback to dynamically adjust the torque determination approach, switching between steady-state lookup tables and transient compensation calculations as needed. This feedback mechanism ensures reliable torque values across all operating conditions while maintaining reasonable system complexity.
Solution Approach 2:
The system changes its determination parameters based on operating conditions. During steady-state operation, it uses pre-calibrated lookup tables with parameters like manifold pressure and engine speed. During transient operation, it switches to a dynamic calculation mode that incorporates inertial parameters and rate-of-change terms. This parameter adaptation ensures reliability without requiring a single complex system for all conditions.
3Measurement precision
If existing torque determination methods are used, then the system is simple, but the accuracy during transient operation deteriorates
Solution Approach 1:
The system performs preliminary determination of base torque values under steady-state conditions using lookup tables and standard calculations. These pre-calculated values are then adjusted during transient operations by adding compensation terms for inertial effects. This preliminary action approach allows the system to maintain accuracy without requiring complete recalculation during dynamic conditions.
Solution Approach 2:
The control system dynamically adapts its calculation method based on the detected operating state. It continuously monitors the rate of change of engine parameters and automatically switches between steady-state lookup table mode and transient compensation mode. This dynamic adaptation ensures high accuracy during transient operations while maintaining system simplicity during steady-state conditions.
4Measurement precision
If existing torque determination methods are used, then the device complexity is low, but the effectiveness in accounting for air-fuel ratio and engine acceleration deteriorates
Solution Approach 1:
The control system is segmented into multiple functional blocks: a base torque determination block that calculates steady-state torque, a transient compensation block that accounts for inertial effects, and an integration block that combines both. This segmentation allows the system to maintain high accuracy during transient operations while keeping each individual block relatively simple and manageable.
Solution Approach 2:
The system changes its determination parameters based on operating conditions. During steady-state operation, it uses pre-calibrated lookup tables with parameters like manifold pressure and engine speed. During transient operation, it switches to a dynamic calculation mode that incorporates inertial parameters and rate-of-change terms. This parameter adaptation ensures reliability without requiring a single complex system for all conditions.
Data Source
AI summary
A system comprises a powertrain including an engine configured to output torque to a driveline, and an electronic control system operatively coupled with the powertrain. The electronic control system is configured to determine an engine torque value, and control a component of the driveline in response to the engine torque value. The engine torque value may account for an effect of air-fuel ratio (AFR) on engine torque. The engine torque value may account for an effect of charge transport delay on engine torque.