Jatco Corporation

Nissan Motor Company Limited

Kosuke Abe

Youji Itou

Haruka Ozono

Masahiro Hamano

Tomoaki Kabe

Shin Tsukamoto

Tomoyuki Suwabe

Keisuke Ichikawa

Kiyofumi Sasaki

Hiroyasu Tanaka

Seiichiro Takahashi

Hajime Tasaka

Norihira Amano

Soyoung Lee

Kokan Boku

A shifter abnormality diagnosis device for a shifter used in an automatic transmission having a manual mode, the shifter including a first switch for outputting a signal corresponding to the position of a select lever and a second switch for outputting a signal corresponding to the position of the select lever if the select lever is located in at least one of an upshift range or a downshift range, wherein the abnormality diagnosis device is configured to perform an abnormality diagnosis of the second switch on the basis of an output signal of the second switch and prohibit the abnormality diagnosis of the second switch if it is determined that the select lever is not located in any one of forward ranges including the upshift range and the downshift range on the basis of an output signal of the first switch.

Shifter abnormality diagnosis device and shifter abnormality diagnosis method

A vehicle control device for a vehicle with a drive source and an automatic transmission including a friction engaging element for transmitting a driving force of the drive source to drive wheels by being engaged by a hydraulic pressure, wherein the vehicle control device is configured to perform an abnormality diagnosis of a solenoid valve for adjusting a hydraulic pressure to be supplied to the friction engaging element on the basis of a slip amount of the friction engaging element, and prohibit the abnormality diagnosis of the solenoid valve if a hydraulic pressure upstream of the solenoid valve is below a predetermined hydraulic pressure at which the friction engaging element is engaged, the hydraulic pressure upstream of the solenoid being a source hydraulic pressure to be adjusted by the solenoid valve.

Vehicle control device and vehicle control method

In a transmission control device for controlling a transmission, a controller determines failure of a specific section. The controller variably controls line command pressure and secondary command pressure, and in a case where the failure is determined, fixes the line command pressure to a line pressure set value and the secondary command pressure to a secondary pressure set value. In a case where the failure is determined, the controller further starts a change in the secondary command pressure after start of a change in the line command pressure, and controls the secondary command pressure in such a manner that the secondary command pressure takes a first predetermined time to have the secondary pressure set value.

Transmission control device and transmission control method

In a transmission control device for controlling a transmission, a controller determines failure of a SOL corresponding to a hydraulic secondary-pressure actuator. The controller variably controls line command pressure, and in a case where the failure is determined, fixes the line command pressure to a line pressure set value. The controller variably controls primary command pressure, and in a case where the failure is determined, continuously changes a speed ratio of a variator by variably controlling the primary command pressure. The controller variably controls secondary command pressure, and in a case where the failure is determined, fixes the secondary command pressure to a secondary pressure set value.

In a transmission control device for controlling a transmission, a controller determines failure of a SOL corresponding to a hydraulic primary-pressure actuator. The controller variably controls line command pressure, and in a case where the failure is determined, continuously changes a speed ratio of a variator by variably controlling the line command pressure. The controller variably controls primary command pressure, and in a case where the failure is determined, fixes the primary command pressure to a primary pressure set value. The controller variably controls secondary command pressure, and in a case where the failure is determined, fixes the secondary command pressure to a secondary pressure set value.

Pressure regulation valve control device has line pressure regulation valve () having line pressure solenoid () and line pressure spool valve () and CVT control unit () controlling secondary pressure (Psec) by actuating the line pressure spool valve () by solenoid pressure (Psol) produced by controlling current command value (I) to the line pressure solenoid (). CVT control unit () has abnormality control unit (). The abnormality control unit () is configured to, when decrease in secondary pressure (Psec) is detected during travel, execute, during travel, abnormality control that increases solenoid pressure (Psol), supplied to line pressure spool valve () from line pressure solenoid (), more than solenoid pressure (Psol) of a time when the decrease in secondary pressure (Psec) is detected. With this, even when the decrease in the pressure is detected during travel, the decrease in the pressure is suppressed during travel while reducing influence on vehicle travel.

Pressure regulation valve control device

An automatic transmission includes an oil temperature detecting unit configured to detect an oil temperature of the hydraulic oil, and a controller configured to perform the control of the speed ratio on a basis of the oil temperature obtained from the oil temperature detecting unit. The controller is configured such that if the controller has failed to obtain the oil temperature from the oil temperature detecting unit, the controller outputs a command to restrict an output from the driving force source, and such that if the controller has obtained the oil temperature from the oil temperature detecting unit again, the controller gradually cancels the command to restrict the output from the driving force source.

Automatic transmission and control method of the same

CVT controller has rotation speed sensors detecting driving and driven wheel rotation speed; driving and driven wheel speed difference detection unit detecting wheel speed difference &#x394;vfr; and bad road judgment unit judging that road is bad road when &#x394;vfr is first value &#x394;vfr_br or greater. CVT controller further has first belt clamping force increase unit increasing belt clamping force in case where road is judged to be bad road, as compared with case where road is not judged to be bad road; vibration detection unit detecting vehicle speed vibration fvsp; and second belt clamping force increase unit increasing belt clamping force when &#x394;vfr is second value &#x394;vfr_psec or greater or when fvsp is third value fvsp_psec or greater in case where road is not judged to be bad road, as compared with case where &#x394;vfr is less than &#x394;vfr_psec and case where fvsp is less than fvsp_psec.

Control device for continuously variable transmission

A control device for a continuously variable transmission of a vehicle includes a shift control section being configured to perform a rough road corresponding control to increase the hydraulic pressure to a value larger than the hydraulic pressure at a smooth road judgment at which the smooth road is judged, at a rough road judgment at which the rough road is judged, and when a line-pressure-up control condition is satisfied at the rough road judgment, the line pressure control section being configured to increase the line pressure to be greater than the line pressure when the line-pressure-up control condition is not satisfied.

Control device for continuously variable transmission for use in vehicles

A control device for a continuously variable transmission of a vehicle includes: a shift control section being configured to perform a rough road corresponding control to increase the hydraulic pressure supplied to the secondary pulley to a value larger than the hydraulic pressure at a smooth road judgment at which the smooth road is judged, at a rough road judgment at which the rough road is judged, and thereby to increase the clamping force of the secondary pulley with respect to the circular belt member; and a rotation speed control section being configured to control the transmission gear ratio at the rough road judgment so that a rotation speed of the primary pulley becomes equal to or greater than a lower limit rotation speed which is previously set.

Vehicle stepless transmission control device

A control device for a continuously variable transmission includes a wheel speed difference sensing section configured to sense a wheel speed difference between the driving wheel and the driven wheel from a detection value of the first rotation speed sensor and a detection value of the second rotation speed sensor; and a clamping force increasing section configured to increase a clamping force for sandwiching a belt of the continuously variable transmission by a pulley when the wheel speed difference becomes equal to or greater than a first predetermined value, relative to a case where the wheel speed difference is smaller than the first predetermined value.

Growing community of inventors

Isehara, Japan

Kosuke Abe