Honda Motor Co., Ltd.

Zf Friedrichshafen Ag

Christopher Hopp

Kazuma Sasahara

Ryuichi Mori

Christian Villing

Makoto Kobayashi

Michael Thomas Dickinson

Shintaro Kameda

Ryuji Murata

Brian Flora

Yasuhiro Gokan

Matthew J Tucker

Yoshitaka Shitani

Thomas Stark

Frieder Mohr

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 gear shift mechanism controlled by a gear shift control device includes a plurality of engagement mechanisms and engages three engagement mechanisms to establish any one of a plurality of shift stages. The gear shift control device is adapted to change speed to a desired shift stage set by a manual operation. If a gear shift to the desired shift stage involves the skipping of one or more shift stages and the switching of two or more engagement mechanisms among the plurality of engagement mechanisms that are currently engaged, then the gear shift control device performs the gear shift to the desired shift stage such that the engagement mechanisms to be switched via a shift stage or stages to be skipped are switched one by one.

Gear shift control device, a vehicle using the same, and gear shift control method

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 system and method for regulating torque transmitted via a torque converter can include providing a lock up clutch between a crankshaft and transmission of a vehicle. A position sensor can output data indicative of at least one of an engaged position of the lock-up clutch, a transitional position of the lock-up clutch, and a disengaged position of the lock-up clutch. An engine speed sensor can output data indicative of rotational speed of the crankshaft. A controller can be placed in electrical communication with the engine speed sensor and the position sensor and configured to determine when actuation of the lock-up clutch is desired. The controller can be configured to determine a torque reduction target based on certain variables, for example, engine acceleration. The controller can then signal the engine to output torque substantially equal to the torque reduction target when conditions exist that warrant torque reduction.

System and method for regulating torque transmission in a vehicle powertrain and a vehicle powertrain using same

A method of controlling a reduction of an amount of fuel supplied to an engine provided to a motor vehicle with an automatic transmission separated from the engine by a torque converter is provided. The method includes the step of sensing commencement of a deceleration state during which an amount of the fuel supplied to the engine is to be reduced to an amount that is less than an amount of fuel being delivered to the engine immediately prior to the deceleration state. Whether synchronization of an engine output shaft and a transmission input shaft is appropriate under the deceleration stat is also to be determined. Frictional engagement is to be established between mating surfaces in cooperation with the engine output shaft and the transmission input shaft, and a first compressive lockup force is to be established between the mating surfaces during a first time period to urge synchronization of the engine output shaft and the transmission input shaft, wherein the first time period ends before said synchronization is accomplished. A second compressive lockup force is also to be established between the mating surfaces during a second time period after the first time period and before synchronization is achieved, wherein the second compressive lockup force is less than the first lockup force but sufficient to urge synchronization of the engine output shaft and the transmission input shaft.

Method and system for controlling operation of a transmission lockup clutch

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Dublin, OH, United States of America

Christopher Hopp