Inverse Torque Model for Engine Air and Spark Bounding
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Solution Overview
Problem
Traditional engine control systems fail to accurately control engine torque output and respond rapidly to control signals, lacking coordination among various devices affecting torque output.
Innovation Solution
An engine control system comprising a spark module, torque module, and inverse torque calculation module that determines a desired engine air value using a second-order torque model, with predetermined torque sensitivity constants based on engine actuator positions, to accurately calculate bounded spark and torque values for precise torque 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 torque control accuracy is poor and response speed is slow
Solution Approach 1:
The control system is divided into separate functional modules: a torque model module that establishes the relationship between torque and engine parameters, a parameter calculation module that computes desired air and spark values, and a coordination module that synchronizes multiple actuators. This segmentation allows each module to specialize in specific calculations, improving torque control accuracy while managing system complexity through modular design.
Solution Approach 2:
The system pre-establishes a torque model that contains the mathematical relationships between torque output and engine parameters (air flow, spark timing, etc.). This preliminary action enables the control system to quickly calculate desired parameter values without complex real-time iterations, thereby improving response speed while maintaining accurate torque control.
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 system replaces traditional mechanical trial-and-adjustment control methods with a mathematical torque model-based calculation approach. By using predefined mathematical relationships in the torque model, the system can directly compute optimal engine parameters (air flow, spark timing) in response to torque requests, significantly improving response speed while the automated calculation process maintains operational simplicity.
3Reliability
If traditional engine control systems are used, then the number of control components is small, but the coordination among torque-affecting devices is poor
Solution Approach 1:
The torque model serves as an intermediary that coordinates multiple torque-affecting devices (throttle body, spark timing control, fuel injection). Instead of directly controlling each actuator independently, the system uses the torque model to calculate desired parameter values that naturally coordinate the interaction between air flow, spark timing, and fuel injection, improving torque control reliability while managing the complexity of multi-device coordination.
Data Source
AI summary
An engine control system includes a spark bound module that determines a bounded spark value based on a desired spark value, a torque bound module that determines a bounded torque value based on the bounded spark value and a desired torque value, and an inverse torque calculation module that determines a desired engine air value based on the bounded torque value and the square of the bounded spark value. The engine air value may be one of a desired air-per-cylinder value and a desired manifold air pressure value. The bounded spark value and the bounded torque value are determined based on one or more of a plurality of engine actuator positions. Related methods for determining the bounded spark value, the bounded torque value, and the engine air value are also provided.