Ryoichi Hibino

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.

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.

Predictive control for high-EGR SI engines without misfire via flow-based design

This paper introduces a predictive controller that maximizes the EGR ratio in SI engine cylinders and prevents misfires at all throttle operations. However the predictive control problem for the EGR value angle is a nonlinear time-varying one. Therefore, in the proposed controller, the problem is transformed into a time-invariant quadratic one for the EGR flow through the intake valve. As a result, only one controller has to be designed for the entire engine operating range. The effectiveness of the proposed controller is demonstrated using a well-calibrated simulator.

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.