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Technical Paper

Human Driving Behavior Analysis and Model Representation with Expertise Acquiring Process for Controller Rapid Prototyping

Driving car means to control a vehicle according to a target path, e.g. road and speed, with some constraints. Human driving models have been proposed and applied for simulations. However, human control in driving has not been analyzed sufficiently comparing with that of machine control system in term of control theory. Input - output property with internal information processing is not easily measured and described. Response of human driving is not as quicker as that of machine controller but human can learn vehicle response to driving operation and predict target changes. Driving behavior of an expert driver and a beginner in an emission test cycle was measured and difference in target speed tracking was looked into with performance indices. The beginner's operation was less stable than that of the expert. Transfer function of the vehicle system was derived based on linearized model to investigate human driving behavior as a tracking controller in the system.
Technical Paper

A Layer Structured Model Based Diagnosis: Application to a Gear Box System

OBD (On Board Diagnosis) has been applied to detect malfunctions in powertrains. OBD requirements have been extended to detect various failures for ensuring the vehicle emission control system being normal. That causes further costs for additional sensors and software works. Two layers diagnosis system is proposed for a passenger car gearbox system to detect changes from normal behavior. Conventional physical constraints based diagnosis is placed on the base layer. Model based diagnosis and specific symptom finding diagnosis are built on the second layer. Conventional physical constraints based diagnosis is direct and effective way to detect the failure of system if the detected signals exceed their normal ranges. However under the case of system failure with related signals still remain in normal ranges, the conventional detection measures can not work normally. Under this case, Model based diagnosis is proposed to enhance the functionality of diagnosis system.
Technical Paper

Evolution of Vehicle Computer Systems By Its Technologies

ITS (intelligent transport systems) technologies accelerate the development of new vehicle functions using on-board electronic control systems coordinated with roadside facilities. Many kinds of advanced vehicle control systems and advanced information systems will be introduced into the market in the near future. The key technologies of these systems are not only the elemental technology of each mechanism, but also HMI (human machine interface) technology. Without proper HMI, drivers cannot use novel control systems safely, and cannot select suitable information during a drive. Furthermore, as an elemental technology for an on-board computer system, LAN systems with the proper gateway function are required in order to maintain and control various kinds of data, such as vehicle data, driver's condition and roadside information. Fusion of these data will produce new functions for the vehicle.
Technical Paper


This paper describes the results of studies on the behavior of air-fuel ratios under feedback control, the effect of air-fuel ratio modulation on three-way catalyst conversion efficiency and emission test results with and without feed back control. As a further measure for decreasing automobile exhaust emissions, the three-way catalyst activity for reduction of CO, HC and NOx emissions is most effectively utilized when the normal engine air-fuel ratio perturbations are controlled and limited. In order to attain such an objective, this report describes the governing characteristics of an air-fuel ratio control system using an EFl engine coupled to a ZrO2 type O2 sensor and feed back loop. The conversion efficiency characteristics of a conventional three-way catalyst, using systematically modulated air-fuel ratios, and the resultant reduction of exhaust emissions with these systematic fluctuations and limited perturbations are also defined.