Patent application number | Description | Published |
20100049411 | VEHICLE CONTROL APPARATUS - A downshift allowable vehicle speed is variably set according to a torque converter slippage amount. Specifically, a downshift allowable vehicle speed is variably set by, using a reference downshift allowable vehicle speed when the torque converter slippage amount is 0 and a gear ratio of the automatic transmission after a downshift, calculating an allowable vehicle speed correction amount based on the present torque converter slippage amount and the gear ratio after the downshift, and setting a value obtained by subtracting the allowable vehicle speed correction amount from the reference downshift allowable vehicle speed as the downshift allowable vehicle speed. By such setting, it is possible to set a higher downshift allowable vehicle speed as the torque converter slippage amount becomes smaller, so it is possible to expand a downshift allowable region when the manual gearshift mode is selected. | 02-25-2010 |
20100057309 | CONTROL DEVICE FOR VEHICULAR AUTOMATIC TRANSMISSION - A control device for a vehicular automatic transmission which can realize a shifting with quickened response with suppressing a turbine blow-up during the shifting is provided. When a response in hydraulic pressure control by a hydraulic pressure control circuit | 03-04-2010 |
20100198468 | CONTROL DEVICE FOR VEHICLE DRIVE DEVICE AND CONTROL METHOD FOR VEHICLE DRIVE DEVICE - A control device for a vehicle drive device that includes a drive source that outputs a drive force for running and an automatic transmission that has multiple speeds, the control device includes: a blipping control device that performs blipping control in which an output torque of the drive source is changed irrespective of an accelerator operation when a manual downshift of the automatic transmission is performed, and that changes a timing to perform next blipping control in a learning manner on the basis of an undershoot amount of a turbine speed at start of shifting of the automatic transmission. | 08-05-2010 |
20100262345 | CONTROL APPARATUS FOR MULTI-SPEED AUTOMATIC TRANSMISSION - A control apparatus for a multi-speed automatic transmission which is equipped with a manual shift mode that allows a speed step to be shifted up or down manually by an operation of a driver of the vehicle is provided. The control apparatus permits a downshift to be manually performed, provided that during the manual mode, one of vehicle speed, engine rotation speed, and turbine rotation speed of the multi-speed automatic transmission is less than or equal to a downshift permission criterion value that is set according to the speed step achieved by the downshift. The control apparatus corrects the downshift permission criterion value by a speed-value-increasing correction amount that is computed according to the situation of travel of the vehicle. The control apparatus includes a speed-value-increasing correction amount computation portion that computes the speed-value-increasing correction amount separately for each of numbers of steps over which downshifts occur. | 10-14-2010 |
20100332091 | HYDRAULIC CONTROL DEVICE AND HYDRAULIC CONTROL METHOD FOR VEHICLE AUTOMATIC TRANSMISSION - During a non-shift operation when a predetermined gear of an automatic transmission is kept, a hydraulic control unit increases an engagement hydraulic pressure to a friction engagement device associated with the gear formation by a predetermined hydraulic pressure with respect to a line hydraulic pressure. Therefore, in comparison with a case where a hydraulic pressure equivalent to the line hydraulic pressure is set as an engagement hydraulic pressure to the friction engagement device for obtaining a hydraulic pressure equivalent to the line hydraulic pressure, shift response (hydraulic pressure response) variations when shifting from a non-shift state (steady state) into a shift state are suppressed by the margin of the predetermined hydraulic pressure. In addition, in comparison with a case where the engagement hydraulic pressure to the friction engagement device is set to a maximum hydraulic pressure to reduce the response variations, power consumption of each linear solenoid valve is suppressed. | 12-30-2010 |
20110230308 | CONTROL DEVICE OF VEHICLE DRIVE-TRAIN SYSTEM - A control device of a vehicle drive-train system including an engine, an electronic throttle valve, an automatic transmission having a manual shift mode, a torque converter provided between the automatic transmission and the engine, and a lock-up clutch operable to directly connect an input member and an output member of the torque converter with each other includes a blipping control device that performs blipping control for temporarily increasing the output rotational speed of the engine by means of the electronic throttle valve, when a power-off downshift is performed while the automatic transmission is in the manual shift mode; and a lock-up control device that engages or partially engages the lock-up clutch, based on a difference between a rotational speed of the output member of the torque converter and a rotational speed of the input member thereof, which the difference is reduced after the blipping control is started. | 09-22-2011 |
20130012356 | SHIFT CONTROLLER FOR AUTOMATIC TRANSMISSION - A shift controller for an automatic transmission capable of automatically shifting up in a manual mode is provided. In the shift controller, a hysteresis between an automatic upshift line and a downshift permission line is set to be smaller as the accelerator opening degree decreases. As a result, when the accelerator opening degree is larger and therefore hunting is more likely to occur, it is possible to avoid an excessively small time interval between a downshift and an upshift. On the other hand, when the accelerator opening degree is smaller and therefore hunting is less likely to occur, a manual downshift permission region can be expanded to a higher rotational speed region, whereby a driver's manual downshift request can be satisfied in a higher vehicle speed region. | 01-10-2013 |
20140019021 | VEHICLE CONTROL DEVICE - A vehicle control device includes an engine that is a power source of a vehicle, a transmission configured to connect the engine to a drive wheel of the vehicle, and a clutch configured to connect or block transmission of power between the engine and the drive wheel through the transmission. The vehicle control device is capable of executing predetermined control to allow the vehicle to travel while stopping supplying fuel to the engine and releasing the clutch that has been engaged, during travel of the vehicle, and the vehicle control device downshifts the transmission at the time the clutch is released in the predetermined control. It is possible to shift the transmission into a lowest-speed side gear ratio by the downshift. | 01-16-2014 |
20140244123 | VEHICLE CONTROLLER - A vehicle controller includes a first abrupt deceleration determining unit (a rotation change rate determining unit, an ABS determining unit) configured to determine an abrupt deceleration state of a vehicle, and a second abrupt deceleration determining unit (a brake determining unit) having a required time for determining an abrupt deceleration shorter in comparison with that of the first abrupt deceleration determining unit, wherein any one of the first abrupt deceleration determining unit and the second abrupt deceleration determining unit is used for determining the abrupt deceleration of the vehicle | 08-28-2014 |