Peter James Maloney

An Event-Based Transient Fuel Compensator with Physically Based Parameters

An event-based transient fuel compensator (TFC) algorithm was developed for production application on SPFI gasoline engines. The independent parameters of the TFC were related to fundamental mass-transfer principles from the research of Gilliland and Sherwood [1] to simplify cold-driveability and emissions calibration activities. A compact intake valve temperature model was developed to further simplify calibration. Digital Control Theory was applied to the calibration structure of the algorithm to clarify the relationship between compensator stability and parameter settings. In its final production algorithm form on a 2.4L DOHC engine application, the TFC met the required subjective cold-driveability requirements and emission standards with a significant reduction in transient fuel calibration complexity. ALGORITHM PURPOSE The TFC algorithm was designed to provide compensation for fuel film dynamics in a SPFI gasoline engine. The TFC problem has been presented previously in Aquino [2] and many others. As shown below in Figure 1, the TFC insures that a desired mass of fuel (Input 1) enters the engine cylinder by producing a commanded fuel mass output to account for fuel film and fuel injection dynamics. The TFC uses the independent engine operating states (Inputs 2-6) to model the dynamics of the fuel film and fuel injection. The purpose of the TFC was to significantly reduce the number of calibratable parameters needed to relate the dynamic characteristics of the fuel film to the independent engine operating parameters, using fundamental Chemical Engineering research as a guide. Figure 1. Transient Fuel Compensator and Plant Transient Fuel Compensa to r Algor i thm 1 2 3 4 5 6 Desired Fuel Mass Intake Air Mass Flow Intake Manifold Pressure Intake Air Temperature Coolant Temperature Engine Speed Commanded Fuel Mass Injector Drivers

A Plant Modeling Process for Practical Control System Design

Abstract A plant modeling process is presented with an example application. The process was designed to achieve development cost savings by removing roadblocks to the application of classical mechanics and control theory in production automotive control systems. The development of small, physicallybased, effective plant models is facilitated by a communication format that coordinates conflicting conceptual and detail design perspectives inherent in the engineering Workforce.