Jatco Corporation

Nissan Motor Company Limited

Hiroki Kawakami

Tomomasa Ikeda

Shinya Mochiyama

Hideharu Yamamoto

In line pressure control apparatus and method for a vehicle, a line pressure controller outputs a line pressure command to reduce an indicated pressure toward a required indicated pressure by which a required pressure can be secured and which is lower than an initial stage indicated pressure from the initial stage indicated pressure preset to be higher than the required pressure, while a state of each of an electrically driven oil pump (sub-O/P) and a mechanical oil pump (M-O/P) enters a first region (a) and outputs the line pressure command to hold the indicated pressure at a time point at which the first region is ended, while the state enters a second region (b), when a hydraulic pressure source is transitioned from the electrically driven oil pump to the mechanical oil pump.

Line pressure control apparatus and method for vehicle

In control apparatus and method for a hybrid vehicle, a line pressure control valve disposed at a downstream side of each of mechanical oil pump (M-O/P) and electrically driven oil pump (S-O/P) to decrease a supplied hydraulic pressure from at least one of the mechanical oil pump and the electrically driven oil pump by opening drain ports thereof in accordance with a control valve command value is provided, the control valve command value is set by adding a predetermined additive correction quantity to a required line pressure set in accordance with operating states of a hydraulic pressure clutch (CL) and a transmission and the drain ports of the line pressure control valve are controlled to a closure side, during an actuation of the electrically driven oil pump.

Control apparatus and method for hybrid vehicle

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S, S), prior to the start of the shift, a heat generation amount of the frictional element if the shift is performed in the first shift mode, predicts (S, S) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state of the frictional element and the predicted heat generation amount, and either performs (S, S) the shift in a second shift mode, in which a heat generation amount is lower than that of the first shift mode, or prohibits (S) the shift when the predicted thermal load state upon shift completion is inside a predetermined region.

Shift control device for automatic transmission and control method thereof

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S), prior to the start of the shift, a heat generation amount of the frictional element during the shift, predicts (S, S) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state and the predicted heat generation amount, and when the predicted thermal load state upon shift completion is inside a predetermined region, either performs (S, S) the shift after modifying a shift mode such that the heat generation amount of the frictional element is smaller than that of a case in which the predicted thermal load state upon shift completion is outside the predetermined region, or prohibits (S) the shift, wherein the predetermined region is set at a different region depending on whether the shift is an upshift or a downshift.

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S), prior to the start of the shift, a heat generation amount of the frictional element during the shift, predicts (S) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state of the frictional element and the predicted heat generation amount, determines (S, S, S) whether to permit or prohibit the shift on the basis of the predicted thermal load state upon shift completion, and halts the determination as to whether to permit or prohibit the shift, made on the basis of the predicted thermal load state upon shift completion, when a shift mode of the shift is a second shift mode in which the heat generation amount is smaller than that of a first shift mode.

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Fuji, Japan

Hiroki Kawakami