Invention Application
- Patent Title: Method and system for controlling creep in automatic transmission
- Patent Title (中): 自动变速器蠕变控制方法及系统
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Application No.: US10253474Application Date: 2002-09-25
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Publication No.: US20030171186A1Publication Date: 2003-09-11
- Inventor: Takashi Okada , Toshimichi Minowa , Mitsuo Kayano , Tatsuya Ochi , Hiroshi Sakamoto
- Applicant: Hitachi, Ltd.
- Applicant Address: null
- Assignee: Hitachi, Ltd.
- Current Assignee: Hitachi, Ltd.
- Current Assignee Address: null
- Priority: JP2002-061894 20020307
- Main IPC: B60K041/28
- IPC: B60K041/28

Abstract:
A method and system for controlling creep in an automatic transmission, comprising a first creep torque control means which, upon generation of an accelerator- and brake-pedal undepressed state in a running mode, generates a target creep speed, the target creep speed increasing as a function of time and settling to a predetermined value, the first creep torque control means then calculating a creep torque from the target creep speed, detecting a change in vehicle load from a speed deviation, correcting a target creep torque on the basis of the detected change in vehicle load, and controlling the engine torque on the basis of the correction, and a second creep torque control means which controls a transfer torque of a starting clutch (a first friction clutch) on the basis of a slipping speed of the starting clutch and the target creep torque, the creep controlling method and system being able to realize a stable creep running even against a change in running environment such as the existence of a slope or an increase of payload while suppressing wear and heat generation of the friction clutch.
Public/Granted literature
- US06918854B2 Method and system for controlling creep in automatic transmission Public/Granted day:2005-07-19
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