Synchronous shift execution for hybrid transmission
First Claim
1. Article of manufacture, comprising a computer readable storage medium having a computer program encoded therein for effecting a method to execute a shift in a transmission of a powertrain system, the powertrain system comprising a plurality of torque-generative devices operable to supply motive torque to the transmission device, the transmission device comprising a plurality of gears and a plurality of torque-transfer devices, wherein torque is transmitted between the transmission device and an output shaft through actuation of at least one of the torque-transfer devices, the computer program comprising:
- code for operating the transmission in an initial fixed ratio operation including actuation of a first torque-transfer device and a second torque-transfer device;
code for reducing reactive torque of the first torque-transfer device;
code for deactivating the first torque-transfer device when the reactive torque of the first torque-transfer device is less than a predetermined value;
code for operating the transmission in a mode operation including actuation of the second torque-transfer device;
code for determining rotational speed of an input shaft to the transmission is substantially synchronized with a rotational speed of a third torque-transfer device when operating the transmission in the mode operation; and
code for actuating the third torque-transfer device when the rotational speed of the input shaft to the transmission is substantially synchronized with the rotational speed of the third torque-transfer device to operate the transmission in a final fixed ratio operation, including actuation of the second torque-transfer device and the third torque-transfer device.
13 Assignments
0 Petitions
Accused Products
Abstract
An apparatus and method are provided to execute synchronous shifting in a powertrain system having multiple torque-generative devices each operable to independently supply motive torque to the transmission device. The exemplary transmission device comprises a two-mode, compound-split, hybrid electro-mechanical transmission. Operation includes operating in an initial fixed gear ratio, operating the transmission in a mode operation, and, operating the transmission in a final fixed gear ratio. The control system reduces reactive torque of a clutch activating the initial gear, and deactivates the first torque-transfer device when the reactive torque is less than a predetermined value. It determines that speed of an input shaft to the transmission is substantially synchronized with a rotational speed of the second torque-transfer device, and actuates the second torque-transfer device.
-
Citations
19 Claims
-
1. Article of manufacture, comprising a computer readable storage medium having a computer program encoded therein for effecting a method to execute a shift in a transmission of a powertrain system, the powertrain system comprising a plurality of torque-generative devices operable to supply motive torque to the transmission device, the transmission device comprising a plurality of gears and a plurality of torque-transfer devices, wherein torque is transmitted between the transmission device and an output shaft through actuation of at least one of the torque-transfer devices, the computer program comprising:
-
code for operating the transmission in an initial fixed ratio operation including actuation of a first torque-transfer device and a second torque-transfer device; code for reducing reactive torque of the first torque-transfer device; code for deactivating the first torque-transfer device when the reactive torque of the first torque-transfer device is less than a predetermined value; code for operating the transmission in a mode operation including actuation of the second torque-transfer device; code for determining rotational speed of an input shaft to the transmission is substantially synchronized with a rotational speed of a third torque-transfer device when operating the transmission in the mode operation; and code for actuating the third torque-transfer device when the rotational speed of the input shaft to the transmission is substantially synchronized with the rotational speed of the third torque-transfer device to operate the transmission in a final fixed ratio operation, including actuation of the second torque-transfer device and the third torque-transfer device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. Method to execute a shift from an initial gear to a final gear in a transmission of a powertrain system, the powertrain system comprising a plurality of torque-generative devices each operable to supply motive torque to the transmission device, the transmission device comprising a plurality of gears and a plurality of torque-transfer devices, wherein torque is transmitted between the transmission device and an output shaft through actuation of at least one of the plurality of torque-transfer devices, comprising:
-
operating the transmission in an initial fixed ratio operation gear including actuation of a first torque-transfer device and a second torque-transfer device; reducing reactive torque of the first torque-transfer device; deactivating the first torque-transfer device when the reactive torque of the first torque-transfer device is less than a predetermined value; operating the transmission in a mode operation including actuation of the second torque-transfer device; determining rotational speed of an input shaft to the transmission is substantially synchronized with a rotational speed of a third torque-transfer device when operating the transmission in the mode operation; and actuating the third torque-transfer device when the rotational speed of the input shaft to the transmission is substantially synchronized with the rotational speed of the third torque-transfer device to operate the transmission in a final fixed ratio operation, including actuation of the second torque-transfer device and the third torque-transfer device. - View Dependent Claims (17, 18, 19)
-
Specification