Developing a Technique for Extraction of Transient Control Strategies from Automotive Electronic Control Units, 03-9247Printer Friendly Version
Inclusive Dates: 04/01/01 - 04/01/03
Background - Automotive system benchmarking is a common practice used by both automotive companies and government agencies. The benchmarking process typically involves the characterization of the mechanical as well as the electrical aspects of the automotive system. This process of characterization is used not only to evaluate automotive products that outperform their competition but also, more importantly, to create a "baseline." This baseline, which is a system equivalent in characteristics to the automotive product, is often used to develop and add new features to the product, thus enhancing the product.
The automotive control system comprises of a number of sub-control systems such as the fuel quantity control system, fuel timing control system, and EGR control system. Each of these sub-control systems typically consists of two components: (1) the steady-state component and (2) the transient component.
The steady-state component, as the name implies, is responsible for the control of the relevant subsystem during steady-state operation while the transient component is responsible for controlling the sub-system behavior during transient events such as a throttle tip-in and tip-off.
This project investigated the characterization process of the transient-component of a production automotive engine control system - fueling control system.
Approach - This project developed a general methodology for characterizing the automotive engine controller based on the investigation of the characterization process for a specific engine. The control strategy benchmarking process included the extraction of both the steady-state and the transient control strategies. The steady-state component of the control was identified using both the bilinear interpolation technique and neural network model. For the transient component, four different model structures were examined.