Coordinated Engine Torque Control via Cam Phaser Scheduling
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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, leading to inefficiencies in torque management among various engine components.
Innovation Solution
A control system comprising a target air per cylinder module, a target area module, and a phaser scheduling module, which determine and adjust target spark timing, intake and exhaust cam phaser angles, and throttle valve openings to optimize engine torque output, minimizing delays in torque changes and reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional engine control systems are used to control engine output torque, 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: target air per cylinder module, target area module, and phaser scheduling module. Each module independently controls specific parameters (spark timing, throttle opening, cam phaser angles) to achieve precise torque control without requiring complex integrated control logic.
Solution Approach 2:
The system performs preliminary determination of target values for spark timing, throttle opening, and cam phaser angles based on desired torque output before actual torque delivery. This advance planning enables rapid response when torque changes are requested, as the control system already has pre-calculated target values ready for implementation.
2Speed
If traditional engine control systems are used, then the system is easy to operate, but the response speed to control signals is slow
Solution Approach 1:
The control system pre-determines target values for all critical parameters (air per cylinder, throttle opening, cam phaser angles) based on the desired torque output before the torque is actually delivered. This preliminary calculation eliminates delays during torque changes, as the system only needs to execute pre-computed commands rather than calculate in real-time during transient conditions.
Solution Approach 2:
The system dynamically adjusts multiple parameters (spark timing, throttle opening, intake/exhaust cam phaser angles) in a coordinated manner based on operating conditions and desired torque changes. This dynamic multi-parameter adjustment enables rapid response to torque requests while maintaining optimal engine performance across varying operating ranges.
3Productivity
If traditional engine control systems are used, then fewer control modules are required, but torque coordination among various devices is inefficient
Solution Approach 1:
The control system is divided into specialized modules: target air per cylinder module controls spark timing, target area module controls throttle opening, and phaser scheduling module controls cam phaser angles. This segmentation allows each module to optimize its specific function while working together for coordinated torque control, improving overall torque management efficiency.
Solution Approach 2:
The control system uses a universal target value determination approach where desired torque output serves as the common input for calculating all target parameters (air per cylinder, throttle opening, cam phaser angles). This universal torque-based coordination ensures all control devices work together harmoniously to achieve the desired torque output efficiently.
Data Source
AI summary
A control system for an engine includes a target air per cylinder (APC) module, a target area module, and a phaser scheduling module. The target APC module determines a target APC based on a target spark timing, a target intake cam phaser angle, and a target exhaust cam phaser angle. The target area module determines a target opening of a throttle valve of the engine based on the target spark timing, the target intake cam phaser angle, and the target exhaust cam phaser angle. The target area module controls the throttle valve based on the target opening. The phaser scheduling module determines the target intake and exhaust cam phaser angles based on the target APC. The phaser scheduling module controls intake and exhaust cam phasers of the engine based on the target intake and exhaust cam phaser angles, respectively.