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AssigneeHitachi, Ltd.
InventorsTakashi Okada, Toshimichi Minowa, Mitsuo Kayano, Tatsuya Ochi, Hiroshi Sakamoto
Estimating the term…
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.
A vehicular creep control method comprising a detection step of detecting a creep torque generating state, a target creep speed calculating step of calculating a target creep speed in accordance with the detected state, and a control step of controlling the vehicle speed so as to approach said target creep speed.
A vehicular creep control system comprising a detecting means for detecting a creep torque generating state, a target creep speed generating means for generating a target creep speed in accordance with the detected state, and a control means for controlling the creep torque in such a manner that the vehicle speed approaches said target creep speed.
A vehicular creep control system comprising an operation state input means which inputs at least one of a state of brake operation by a vehicular driver, a state of operation of an accelerator, and a range selection state of a shift lever in a transmission, a detecting means which detects a creep torque generating state on the basis of the state of operation inputted by said operation state input means, a target creep torque generating means which generates a target creep speed in accordance with said detection, and a control means which controls the creep torque in such a manner that the vehicle speed approaches said target creep speed, wherein the creep torque is generated when it is detected by said detecting means that the shift lever lies in a vehicle running range, that the brake is released, and that the accelerator is not depressed.
Dependencies are inferred from the claim text.