Masataka Osawa

H/sup /spl infin// control design for torque-converter-clutch slip system

This paper describes the development of a robust feedback controller for the torque-converter-clutch slip control system mounted in the Toyota A245E automatic trans-axle. H/sup /spl infin// control theory was applied as a systematic design method in order to ensure robust stability against large variation in characteristics under vehicle operating conditions and variation in friction characteristics of the clutch induced by aging deterioration. This theory enables a detailed design in the frequency domain. As a result, the control system achieves high levels of response and reliability, which contribute to a large-scale reduction of fuel consumption.

Friction Characteristics Analysis for Clamping Force Setup in Metal V-Belt Type CVT

In order to increase the transfer efficiency in a metal V-belt type CVT (Continuously Variable Transmission), it is effective to lower belt clamping force from a current setting value. However, setting the clamping force too low will cause a macro slip (large belt slip). Thus, in order to set the clamping force to the proper level, the friction characteristics between the belt and the pulley (belt friction characteristics) must be understood in detail, and the macro slip threshold must be defined. In this paper, we shall propose a friction expression model for a metal V-belt type CVT and use this model to explain the speed reducing ratio dependence and speed dependence of the maximum friction coefficient (μmax). We shall also define the macro slip threshold in torque fluctuation environment.

The effect of patent family information in patent citation network analysis: a comparative case study in the drivetrain domain

Abstract Previous researchers of citation analysis often analyze patent data of a single authority because of the availability of the data and the simplicity of analysis. Patent analysis, on the other hand, is used not only for filing and litigation, but also for technology trend analysis. However, global technology trends cannot be understood only with the analysis of patent data issued by a single authority. In this paper, we propose the use of patents from multiple authorities and discuss the effect of bundling patent family information. We investigate the effect of patent families with cases from automobile drivetrain technology. Based on the results, we conclude that the use of multiple authorities’ patent data bundled with the patent family information can significantly improve the coverage and practicability of patent citation analysis.

Robust Design Method for Automatic Calibration of Automatic Transmission Shift Control System

Recently, automatic transmissions have a problem whereby the calibration of control signals for the shift control system demands an enormous amount of time due to the increase in gear ratio. This study proposes the hierarchical and inverse directional design method in order to avoid a lot of trial and error in calibration. This method has two model-based processes: the first is the design of the target driving torque and the second is the control signals design based on the target. Through on-vehicle tests our proposed method has the same performance as the conventional one.

Application of H∞ Control Design to Slip Control System for Torque Converter Clutch

Abstract This paper describes the development of a robust feedback controller for the torque converter clutch slip control system mounted in the Toyota A541E automatic transaxle. H ∞ control theory was applied as a systematic design method in order to ensure robust stability against large variation in characteristics under vehicle operating conditions and variation in friction characteristics of the clutch induced by aging deterioratioa As a result, the control system achieves high levels of response and reliability, which contribute to a large-scale reduction of fuel consumption.

ON-LINE DESIGN METHOD OF FEEDBACK CONTROLLER FOR AUTOMATIC TRANSMISSION SYSTEM

Abstract This paper presents a new design method, which reduces the developing and design time for a feedback controller in various automotive electronic control systems. To achieve this problem, “On-line Design Method” hasbeen developed, which first acquires data and sets up a model at the same timeusing onboard ECU so that it can next output the controller directly, by representing the characteristics of thecontrolled system with only two parameters. The new method has been applied to Automatic Transmission lock-up clutch slip control system, and realized over 50% reduction of design time as compared with the conventional method.

Fuzzy Auto-Tuning for a Gasoline Engine's Electronic Speed Controller.

PID (Proportional, Integral and Derivative) control is generally used in industrial products today, because of its simple algorithm and good adaptability on the scene. However, the matching of PID control parameters is difficult, thus we are looking forward to the development of auto-tuning of PID control parameters. In this study, we attempted fuzzy auto-tuning for a gasoline engines electronic speed controller with PID control. Here fuzzy production rules are independently applied, and each rule is weighted by the degree of inputs of assumed parts. This fuzzy reasoning method is useful in simplifying the description of fuzzy production rules and provides a simple means of control similar to that performed by humans.