公开(公告)号：US09052013B2

公开(公告)日：2015-06-09

申请号：US13715140

申请日：2012-12-14

Applicant: Caterpillar Inc.

Inventor： James W. Landes ,  Jacob Kunowski

IPC: F16H59/66 ,  F16H61/21 ,  F16H61/02 ,  F16H59/52

CPC classification number: F16H61/21 ,  F16H59/52 ,  F16H61/0213 ,  F16H2059/663

Abstract: A method is described for controlling an automatic transmission of a vehicle during deceleration arising from a force resisting forward movement arising from an incline grade and a vehicle mass. The force of resistance to forward movement is determined at least based upon the incline grade. A destination gear is calculated based upon a set of gear-specific output curves and the force of resistance. The destination gear is compared to a current gear within which the machine is operating. The programmed controller executes an early downshift schedule when the destination gear is at least two positions lower than the current gear, thereby initiating a series of downshifts of the automatic transmission from the current gear to the destination gear. During each gear shift performed according to the early downshift schedule, shifting occurs at a cross-over point between output curves of current and next lower gears.

Abstract translation: 描述了一种用于控制在由倾斜坡度和车辆质量引起的向前运动的力产生的减速期间车辆的自动变速器的方法。 至少基于斜度等级确定向前运动的阻力。 目标齿轮根据一组特定于齿轮的输出曲线和阻力来计算。 将目的地齿轮与当前的机器进行比较。 当目的地齿轮比当前齿轮低至少两个位置时，编程的控制器执行早期降档时间表，从而启动自动变速器从当前档位到目的地档位的一系列降档。 在根据早期降档计划进行的每次换档期间，在当前和下一个下部齿轮的输出曲线之间的交叉点处发生换档。

公开(公告)号：US20140172256A1

公开(公告)日：2014-06-19

申请号：US13715140

申请日：2012-12-14

Applicant: CATERPILLAR INC.

Inventor： James W. Landes ,  Jacob Kunowski

IPC: F16H61/00

CPC classification number: F16H61/21 ,  F16H59/52 ,  F16H61/0213 ,  F16H2059/663

Abstract: A method is described for controlling an automatic transmission of a vehicle during deceleration arising from a force resisting forward movement arising from an incline grade and a vehicle mass. The force of resistance to forward movement is determined at least based upon the incline grade. A destination gear is calculated based upon a set of gear-specific output curves and the force of resistance. The destination gear is compared to a current gear within which the machine is operating. The programmed controller executes an early downshift schedule when the destination gear is at least two positions lower than the current gear, thereby initiating a series of downshifts of the automatic transmission from the current gear to the destination gear. During each gear shift performed according to the early downshift schedule, shifting occurs at a cross-over point between output curves of current and next lower gears.

Abstract translation: 描述了一种用于控制在由倾斜坡度和车辆质量引起的向前运动的力产生的减速期间车辆的自动变速器的方法。 至少基于斜度等级确定向前运动的阻力。 目标齿轮根据一组特定于齿轮的输出曲线和阻力来计算。 将目的地齿轮与当前的机器进行比较。 当目的地齿轮比当前齿轮低至少两个位置时，编程控制器执行早期降档时间表，从而启动自动变速器从当前档位到目的地档位的一系列降档。 在根据早期降档计划进行的每次换档期间，在当前和下一个下部齿轮的输出曲线之间的交叉点处发生换档。