Patent application number | Description | Published |
20080234904 | CONTINUOUSLY VARIABLE TRANSMISSION SHIFT CONTROL SYSTEM AND CONTROL METHOD THEREOF - A continuously variable transmission shift control system includes an input rotational speed monitoring unit that determines whether an actual input rotational speed of the CVT reaches the upper limit of a target input rotational speed, an acceleration request determining unit that determines whether a request for acceleration that is equal to or larger than a predetermined value is made, and a shift control inhibiting unit that inhibits shift control for reducing the target input rotational speed even when the actual input rotational speed reaches the upper limit of the target input rotational speed, in the case where the acceleration request determining unit determines that the request for acceleration that is equal to or larger than the predetermined value is made. | 09-25-2008 |
20080255737 | CONTROL APPARATUS AND METHOD FOR CONTINUOUSLY VARIABLE TRANSMISSION - When the vehicle is traveling on an uphill road (step | 10-16-2008 |
20090043468 | CONTROLLING SYSTEM FOR VEHICLE WITH CONTINUOUSLY VARIABLE TRANSMISSION - A controlling system for a vehicle with a continuously variable transmission, which can render a sufficient accelerating feeling in responsive to a driver's requirement. A controller, upon judgment of an acceleration requirement, sets a target drive force higher than the target drive force upon normal calculation upon normal operation of an accelerator pedal, and sets a target rotation speed for acceleration higher than the target rotation speed upon the normal operation and increasing with an increase of the vehicle speed by a predetermined gradient. The speed change ratio of the continuously variable transmission and the output torque of the engine are controlled such that the set target drive force is achieved, and an input shaft rotation speed of the continuously variable transmission coincides with the target rotation speed for the set acceleration. Thus, upon acceleration requirement by the driver, the target drive force increases and the output rotation speed of the drive source increases so that the sufficiently high accelerating feeling from the vehicle can be obtained. | 02-12-2009 |
20090204285 | DIAGNOSTIC APPARATUS AND DIAGNOSTIC METHOD FOR BELT SQUEEZING FORCE ADJUSTING MECHANISM - A diagnostic apparatus and a diagnostic method are provided for a belt squeezing force adjusting mechanism of a continuously variable transmission in which a belt is wound around a primary sheave that receives driving force and a secondary sheave that outputs force to a drive line, and which continuously changes the output rotation speed by adjusting the width of the groove the primary sheave and the secondary sheave by shift control. This diagnostic determines, as a precondition, whether a target control value calculated in shift control is in a low region, and performs a diagnostic on the belt squeezing force adjusting mechanism based on the relationship between an actual control value and the target control value during control to reduce a control value when it is determined that the precondition is satisfied. According to this diagnostic apparatus and diagnostic method, an erroneous diagnosis can be prevented so the diagnostic can be performed accurately. | 08-13-2009 |
20090319144 | SHIFT CONTROL APPARATUS OF A CONTINUOUSLY VARIABLE TRANSMISSION AND METHOD OF DETERMINING WHETHER SHIFT CONTROL APPARATUS IS OPERATING NORMALLY - The invention provides a shift control apparatus of a continuously variable transmission, which includes a feedback control portion which executes feedback control that brings an actual speed ratio close or equal to a target speed ratio, and a normal operation determining portion which determines whether the shift control apparatus is operating normally based on a difference between the actual speed ratio and the target speed ratio, and an amount of change in the actual speed ratio and an amount of change in the target speed ratio during a predetermined interval. | 12-24-2009 |
20100099535 | CONTINUOUSLY VARIABLE TRANSMISSION CONTROL APPARATUS - In an embodiment of the continuously variable transmission control apparatus of the present invention, even if an actual gear change ratio RATIO overshoots a target gear change ratio RATIO T and an upshift gear change instruction (DS | 04-22-2010 |
20100191407 | FAILURE DETERMINING DEVICE AND FAILURE DETERMINING METHOD OF CONTINUOUSLY VARIABLE TRANSMISSION - An ECU executes a program including the steps of determining that a change speed solenoid is abnormal when a target speed ratio falls within a predetermined range, an upshift is recognized and the change speed solenoid is abnormal; determining that the change speed solenoid is normal when the change speed solenoid is not abnormal; determining that a belt pinch pressure solenoid is abnormal when the target speed ratio is substantially equal to a speed ratio γmin on a maximum speed-increase side and the target speed ratio is not substantially equal to an actual speed ratio; and determining that the belt pinch pressure solenoid is normal when the target speed ratio is substantially equal to the actual speed ratio. | 07-29-2010 |
20100191428 | SHIFT CONTROL DEVICE FOR VEHICULAR CONTINUOUSLY VARIABLE TRANSMISSION - In a shift control device for a vehicular continuously variable transmission with an arrangement in which a normal shift mode is switched to an acceleration shift mode in response to an acceleration demand, a shift control is performed to prevent deterioration to running performance due to a transition to the acceleration shift mode by increased running resistance such as ascending road running or the like against a driver will. | 07-29-2010 |
20100235061 | DRIVING POWER SOURCE ROTATIONAL SPEED CONTROL DEVICE AND DRIVING POWER SOURCE ROTATIONAL SPEED CONTROL METHOD - A driving power source rotational speed control device is provided in a vehicle outputs power of a rotary driving power source via a continuously variable transmission as motive power, that changes the rotational speed of the rotary driving power source in association with changes in the vehicle speed when acceleration is requested. The control device includes: acceleration/deceleration state determination means determines whether the vehicle is accelerating or decelerating when acceleration is requested; and rotary driving power source rotational speed change setting means sets the change gradient of the rotary driving power source rotational speed to establish the association of the rotary driving power source rotational speed with changes in the vehicle speed when acceleration is requested. The rotary driving power source rotational speed change setting means suppresses reductions in the rotary driving power source rotational speed when the acceleration/deceleration state determination means determines that the vehicle is decelerating. | 09-16-2010 |