Engine Throttle Control via Model Predictive Torque Management
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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 coordinate torque control among various devices affecting engine output torque effectively.
Innovation Solution
A system utilizing a model predictive control (MPC) module within an engine control module (ECM) to determine target values for throttle, intake and exhaust phaser angles, wastegate, and EGR valve openings, based on a requested torque, while initially using target pressure ratios to manage engine start-up and transition to torque-based control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional engine control systems are used, then the system structure is simple, but the engine output torque control accuracy is poor and response speed is slow
Solution Approach 1:
The control system is segmented into multiple independent modules: a target determination module that calculates desired throttle positions based on torque requests, and a correction module that adjusts for nonlinearities and delays. This modular segmentation enables precise torque control while maintaining manageable system complexity through divided functionality.
Solution Approach 2:
The system implements feedback control by continuously monitoring actual engine torque output and comparing it with the requested torque. The correction module uses this feedback to adjust throttle positions in real-time, compensating for system nonlinearities and delays, thereby achieving accurate torque control without excessive complexity.
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 target determination module pre-calculates the desired throttle position based on the torque request before actual throttle adjustment is needed. This preliminary calculation allows the system to prepare control commands in advance, reducing the effective response time when torque adjustments are required, while keeping the control logic relatively simple.
Solution Approach 2:
The system replaces traditional mechanical throttle cable control with electronic control actuators that can be precisely positioned via electrical signals. This substitution enables faster and more accurate throttle response to control commands, significantly improving response speed while adding manageable electronic control complexity.
3Adaptability or versatility
If traditional engine control is used, then the calibration process is time-consuming, but the system lacks coordination among various torque control devices
Solution Approach 1:
The correction module serves multiple functions: it compensates for throttle nonlinearities, accounts for transmission delays, and coordinates adjustments across different torque control devices. This multi-functionality enables effective coordination among various torque control components without requiring separate calibration procedures for each function, reducing overall calibration time.
Solution Approach 2:
The system uses parameter-based control where the correction module adjusts throttle positions based on calculated correction values that account for different operating conditions. This parameter-driven approach allows the system to adapt to various scenarios without extensive recalibration, as the correction parameters can be adjusted independently of the overall control strategy.
Data Source
AI summary
A system according to the principles of the present disclosure includes a target area module and a throttle actuator module. The target area module determines a target opening area of a throttle valve of an engine based on a first target pressure within an intake manifold of the engine when the engine is starting. The throttle actuator module actuates the throttle valve based on the target opening area.