Engine Torque Control via Predicted Airflow Estimation
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Solution Overview
Problem
Traditional engine control systems fail to accurately control engine torque output and respond slowly to control signals, leading to inefficiencies and circular dependencies among engine actuators, particularly when transitioning to new torque levels, exacerbated by turbocharger lag.
Innovation Solution
An engine control system comprising a predicted airflow module, actuator determination modules, and a mode module that estimates airflow and actuator positions based on desired torque, allowing for coordinated control of throttle, cam phasers, and boost pressure to achieve desired engine parameters efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional engine control systems are used, then the system structure is simple, but the torque control accuracy is poor and response speed is slow
Solution Approach 1:
The control system performs preliminary estimation of desired airflow and actuator positions based on desired torque before actual torque adjustment. The predicted airflow module calculates expected airflow values in advance, and actuator determination modules pre-determine optimal actuator positions, enabling faster and more accurate torque control without waiting for feedback loops
Solution Approach 2:
The control system is divided into multiple independent modules: predicted airflow module, first actuator determination module, first desired air module, and actuator position module. Each module handles a specific function, allowing parallel processing and coordinated control of multiple actuators (throttle, cam phasers, boost pressure) simultaneously, improving both accuracy and response speed
2Speed
If traditional engine control systems are used, then the device complexity is low, but the response speed to control signals is slow
Solution Approach 1:
The system pre-calculates desired airflow and actuator positions based on desired torque before torque adjustment is needed. This preliminary determination of control parameters enables immediate actuation when torque changes are required, eliminating delays associated with traditional feedback-based control systems
Solution Approach 2:
The control system dynamically adjusts multiple actuator positions (throttle area, cam phaser angles, boost pressure) in coordination based on real-time operating conditions and desired torque. The modular architecture allows dynamic optimization of control strategies for different operating modes, improving response speed across varying engine conditions
3Measurement precision
If coordinated control of multiple actuators is implemented, then torque control accuracy improves, but control system complexity increases
Solution Approach 1:
The control system separates coordination of multiple actuators into distinct modular functions: predicted airflow module handles airflow calculation, first actuator determination module handles spark timing, first desired air module handles air quantity, and actuator position module handles final actuator positioning. This segmentation manages complexity by assigning specific coordination tasks to dedicated modules
Solution Approach 2:
The control modules serve multiple functions: the predicted airflow module not only predicts airflow but also informs actuator determination; the actuator position module coordinates throttle, cam phasers, and boost pressure control. This multi-functionality reduces overall system complexity by having modules perform multiple related tasks rather than requiring separate dedicated systems for each function
Data Source
AI summary
An engine control system comprises a predicted airflow module, a first actuator determination module, a first desired air module, and an actuator position module. The predicted airflow module determines a predicted engine airflow based on a desired torque. The first actuator determination module determines a first engine actuator value based on the predicted engine airflow. The first desired air module selectively determines a first desired engine air value based on the first engine actuator value and the desired torque. The actuator position module determines a desired engine actuator value based on the first desired engine air value.