Zf Friedrichshafen Ag

Honda Motor Co., Ltd.

Christian Villing

Ryuichi Mori

Christopher Hopp

Makoto Kobayashi

Klaus Steinhauser

Andreas Schmidt

Kazuma Sasahara

Markus Maurer

Harald Stehle

Günther Maier

Ryuji Murata

Frieder Mohr

Brian Flora

Yasuhiro Gokan

Matthew J Tucker

Yoshitaka Shitani

Thomas Stark

A drive train control method includes transmitting a total time period of a stroke phase and a torque phase of an upshift from a transmission control unit of an automatic transmission to an engine control unit of an engine. The method also includes closing a first shift element of the automatic transmission and opening a second shift element of the automatic transmission during the upshift. A control pressure of the first shift element increases during the torque phase relative to the control pressure of the first shift element at an end of the stroke phase. A control pressure of the second shift element decreases during the torque phase relative to the control pressure of the second shift element at the end of the stroke phase. The method further includes, based at least in part on the total time period of the stroke and torque phases, increasing an actual torque of the engine during the upshift such that the actual torque of the engine increases to a higher gear torque prior to an end of the torque phase.

System and method for increasing upshift engine torque

A gearbox () includes an input shaft (), which is connected to a drive source, and a first and a second proportionally controllable shift element (A-F). A method () for open-loop control of the gearbox () includes: determining () an absolute torque demand () on the drive source on the basis of a profile controlled by way of an open-loop system () and a profile controlled by way of a closed-loop system (); determining () whether the absolute torque demand () threatens to exceed a predetermined threshold value (); and, in response, reducing () the portion controlled by way of the closed-loop system ().

Transmission control system

A method is provided for executing a gearshift in an automatic transmission with several shifting elements. Upon the execution of the gearshift, a first frictional-locking shifting element is opened and a second positive-locking shifting element is closed. If, upon the execution of the gearshift, an input torque of the automatic transmission is less than a threshold value, after at least partially opening the frictional-locking shifting element and after releasing the positive-locking shifting element, there is a monitoring of whether the positive-locking shifting element is transferred into its end position. If it is then determined that the positive-locking shifting element is not in its end position, a torque transferred by the partially open frictional-locking shifting element initially increases. If, despite the increase in torque transferred by the frictional-locking shifting element, the positive-locking shifting element is not in its end position, the operating pressure of the positive-locking shifting element is then increased.

Method for executing a gearshift in an automatic transmission

An engine controller for controlling an internal combustion engine having a plurality of cylinders is provided. The engine controller is in signal communication with the internal combustion engine, an automatic transmission, and a displacement adjusting mechanism. The engine controller is configured to determine an operating condition of the internal combustion engine and to communicate with the automatic transmission to shift to one of a plurality of gear configurations, and the displacement adjusting mechanism to one of activate and deactivate at least one cylinder. The engine controller determines that a shift from a first gear configuration to a second gear configuration requires a positive torque when the at least one cylinder is deactivated. The engine controller communicates with the displacement adjusting mechanism to activate the at least one deactivated cylinder such that the plurality of cylinders are activated before the shift between gear configurations and the positive torque are completed.

Internal combustion engine controller, and control system and method of controlling an internal combustion engine

A method of controlling the system pressure in an automatic transmission having interlocking shifting elements in which, during shifts and gear engagement and gear disengagement processes involving interlocking shifting elements, as a function of the engagement and disengagement times of the interlocking shifting elements involved and the shift conditions of the frictional shifting elements involved, the system pressure is increased to an elevated pressure that enables rapid engagement or disengagement of the interlocking shifting elements, in such manner that the system pressure is increased in at least two phases whose timing depends on the shift conditions of at least one of the shifting elements involved.

Line pressure control method for a transmission having a dog clutch

Growing community of inventors

Langenargen, Germany

Christian Villing