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Analysis of a New Automatic Transmission Control System for LEXUS LS400
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English
Abstract
A new automatic transmission, engineered from concept for “intelligent” and “anti-aging” (long life), has been designed and developed for TOYOTA's luxury passenger car, LEXUS LS400. This system, which has resulted in silky-smooth shift quality without changes in the long term, is composed of a transmission computer that interacts with engine computer, a number of sensors, an electronically controlled hydraulic unit with linear solenoid valves and assorted devices.
As new control logic being developed with the aid of computer simulation to achieve distinction, the hydraulic and engine controls are combined in this system. There is a “feedback control”, where the clutch pressure is controlled according to the rate of acceleration and compensated for dispersion to applied pressure, engine torque and/or the coefficient of dynamic friction of clutches, and at the same time engine torque is reduced by retarding ignition timing.
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Citation
Taniguchi, H. and Ando, Y., "Analysis of a New Automatic Transmission Control System for LEXUS LS400," SAE Technical Paper 910639, 1991, https://doi.org/10.4271/910639.Also In
References
- Kondo T. Iwatsuki K. Taga Y. “Toyota ‘ECT-i’ a New Automatic Transmission with Intelligent Electronic Control System” SAE Paper 900550 1990
- Ishihara T. Emori R.I. “Torque Converter as a Vibrator Damper and Its Transient Characteristics” SAE Paper 660368 1967
- Sindo Y. Ito H. Ishihara T. “A Fundamental Consideration on Shift Mechanism of Automatic Transmission” SAE Paper 790043 1979