Nissan Motor Company Limited

Jatco Corporation

Junki Matsui

Masahiro Hamano

Hajime Tasaka

Norihira Amano

Tarou Murazumi

Masakatsu Ogawa

A vehicle includes a transmission which has a first oil pump driven by rotation of a drive source that drives a drive wheel and a second oil pump provided with a check valve on a suction side and driven by a motor. In a vehicle control device for controlling the vehicle, a minimum value of a drive current value of the motor is defined as a first current value, when the second oil pump is driven in a normal drive state, and a minimum rotation speed of the drive source is increased compared to a case in which the drive current value of the motor is equal to or larger than the first current value, when an automatic downshift control for automatically downshifting a speed ratio of the transmission is executed in a case in which the drive current value of the motor is smaller than the first current value when the second oil pump is driven.

Vehicle control device

An electromagnetic control valve normality determination system includes: a hydraulic pressure source; an electromagnetic control valve structured to regulate an actual pressure of oil to a pressure command point, wherein the oil is supplied from the hydraulic pressure source; and an actual pressure sensor structured to sense the actual pressure of the oil. For determining normality of pressure regulation of the electromagnetic control valve, a normality determinator is configured to: set pressure command regions for determination about pressure regulation of the electromagnetic control valve, without overlapping among the pressure command regions; determine for each of the pressure command regions whether a difference between the actual pressure and the pressure command point in the each of the pressure command regions is less than a threshold value; and determine that the electromagnetic control valve is normal, in response to affirmation of the determination for all of the pressure command regions.

Device for determining normality of electromagnetic control valve

A CVT is provided with a primary pulley () and a secondary pulley () between which a belt () is wound, and hydraulic pressure control valves () which control pulley hydraulic pressures. A CVT controller () sets a base current indicated value to be output to solenoids () of the hydraulic pressure control valves (), on the basis of a pulley hydraulic pressure indicated value. A dither control unit () of the CVT controller () superimposes a dither current onto the base current indicated value to be output to the solenoids () if, during pulley hydraulic pressure control, the situation is determined, on the basis of belt slip determination information, to be such that belt slipping is highly likely to occur.

Continuously variable transmission control device and control method

Abnormality detection device for automatic transmission of invention has automatic transmissionA connected to vehicle driving sourcethrough clutch; range detector detecting selection range of selector leverand outputting detection signal; manual valveconfigured to, when selector lever is positioned at drive range position, engage clutch and bring automatic transmission into power transmission state, and when selector lever is positioned at range position except drive range position, disengage clutch and bring automatic transmission into power non-transmission state. Device further has engagement control unitB controlling clutch from disengagement state toward engagement direction when no-signal state in which signal is not outputted from range detector continues for first predetermined time or more; engagement judgment unitC judging engagement of clutch during engagement control; and abnormality determination unitD determining, when engagement is judged, that range detector is in no-signal abnormality indicating that no signal is outputted.

Growing community of inventors

Isehara, Japan

Junki Matsui