Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1995-07-25
1997-08-19
Marmor, Charles A.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
475904, F16H 5914, F16H 5968
Patent
active
056582137
ABSTRACT:
In a power train control apparatus including an engine, an automatic transmission having a torque converter, and a control unit for controlling the engine and the automatic transmission, the control apparatus is provided with a microcomputer for calculating and estimating values of the input shaft torque and a gear ratio of the automatic transmission. Various characteristics of the engine and the torque converter are obtained in advance by experiments, such as the relationship between an engine torque and an engine speed, and that between a pump capacity coefficient data and a slip ratio of the torque converter. Thereafter, data tables are made by using these characteristics, and control factors required to control the engine and the automatic transmission are made as an equation in relation to the input shaft torque and the gear ratio so as that they can be calculated by the microcomputer.
REFERENCES:
Electronically-Controlled Automatic Transmission with "Hold" Mode Function; Keiji Bouda, Mikio Kawahara, Takuji Fujiwara and Hiroaki Yokota; vol. 42, No. 8, 1988, pp. 1017-1022.
Ibamoto Masahiko
Kuroiwa Hiroshi
Sato Kazuhiko
Hitachi , Ltd.
Hitachi Automotive Engineering Co. Ltd.
Jensen Nathan O.
Marmor Charles A.
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