Pre-throttle Pressure Control for Engine Torque Accuracy
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Solution Overview
Problem
Traditional engine control systems fail to accurately control engine output torque and do not provide rapid responses to control signals, nor do they coordinate torque control among various devices affecting engine output effectively.
Innovation Solution
A system and method that include a desired mass air flowrate module, a desired effective area module, and a throttle actuator module, which generate and adjust the throttle valve opening based on throttle inlet air pressure to achieve precise airflow conditions, determining desired and maximum effective areas to accurately control the throttle valve.
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 insufficient and response speed is slow
Solution Approach 1:
The control system is segmented into multiple independent modules: desired mass air flowrate module, desired effective area module, max effective area module, desired area module, and throttle actuator module. Each module performs a specific function in the torque control process, allowing for precise control while maintaining modular architecture that simplifies implementation.
Solution Approach 2:
The system dynamically calculates the desired effective area and maximum effective area based on real-time throttle inlet air pressure measurements. This dynamic adaptation allows the system to maintain accurate torque control across varying operating conditions, improving response speed and control precision without requiring overly complex hardware.
2Speed
If traditional throttle control is used, then the device complexity is low, but the response speed to control signals is slow
Solution Approach 1:
The system performs preliminary calculations of desired effective area and maximum effective area based on throttle inlet air pressure before finalizing the throttle valve opening command. This preliminary action enables the system to anticipate required adjustments and respond faster to control signals by pre-processing the control logic.
Solution Approach 2:
The system incorporates feedback from throttle inlet air pressure measurements to continuously adjust the desired effective area and maximum effective area calculations. This feedback mechanism enables rapid response to changing conditions by real-time adaptation of control parameters, improving response speed through closed-loop control.
3Reliability
If traditional engine control is used, then the coordination among various torque control devices is insufficient, but implementing complex coordination systems is difficult
Solution Approach 1:
The system merges multiple torque control functions into a unified control architecture where the desired mass air flowrate module, desired effective area module, max effective area module, and desired area module work together in an integrated manner. This merging approach improves coordination among various torque control devices while maintaining manageable system complexity through functional integration.
Data Source
AI summary
A system for a vehicle includes a desired mass air flowrate (MAF) module and a desired effective area module. The desired MAF module generates a desired MAF through a throttle valve of an engine based on an engine torque request. The desired effective area module generates a desired effective area of the throttle valve based on a throttle inlet air pressure (TIAP) and the desired MAF. A throttle actuator module adjusts opening of the throttle valve based on the desired effective area.