Method for fast change of gears in a vehicle comprising a hybrid driveline

Patent metadata

Field	Value
Publication number	US-2016264145-A1
Application number	US-201415032198-A
Country	US
Kind code	A1
Filing date	Nov 13, 2014
Priority date	Nov 21, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

A method for shifting in a vehicle ( 1 ) with a hybrid powertrain ( 2 ), the powertrain includes: a combustion engine ( 3 ), an electric machine ( 4 ), a gearbox ( 6 ) with an input shaft ( 10 ) and a main shaft ( 14 ), wherein the combustion engine ( 3 ) and the electric machine ( 4 ) are connected to the input shaft ( 10 ); and a lay shaft ( 16 ), via gear sets ( 50, 52 and 58, 60, 62 ) is connected to the input shaft ( 10 ) and the main shaft ( 14 ), so that they form a split gear unit ( 13 ) and a main gear unit ( 15 ). The method has the steps: a) to bring the main gear unit ( 15 ) into a substantially zero torque state, b) in the event the input shaft ( 10 ) and the lay shaft ( 16 ) must both be accelerated or decelerated: to initiate synchronization of the speed of the lay shaft ( 16 ) with, on the one hand, the speed of the input shaft ( 10 ), and, on the other hand, the speed of the main shaft ( 14 ), at a joint first point in time (t 1 ), c) to engage a gear in the split gear unit ( 13 ) when the speed of the lay shaft ( 16 ) has been synchronized with the speed of the input shaft ( 10 ) at a second point in time (t 2 ), and d) to engage a gear in the main gear unit ( 15 ) when the speed of the lay shaft ( 16 ) has been synchronized with the speed of the main shaft ( 14 ) at a third point in time (t 3 ). Also a hybrid powertrain ( 2 ) and a vehicle ( 1 ), as well as a computer program (P) and a computer program product are disclosed, which perform the method.

First claim

1 . A method for shifting in a vehicle with a hybrid powertrain, the vehicle comprising:
a combustion engine and an electric machine both configured and operable to drive the vehicle; a gearbox having an input shaft and a main shaft, wherein the combustion engine and the electric machine are connected to the input shaft; and a lay shaft which is connected via gear sets to the input shaft and to the main shaft, to form a split gear unit and a main gear unit; the method comprising the following steps: a) bringing the main gear unit into a substantially zero torque state; b) when the input shaft and the lay shaft are both accelerated or decelerated: initiating, at a joint point in time t 1 , on the one hand, synchronizing the speed of the lay shaft with the speed of the input shaft, and, on the other hand, synchronizing the speed of the lay shaft with the speed of the main shaft; c) engaging the gear in the split gear unit when the speed of the lay shaft has been synchronized with the speed of the input shaft at a second point in time; and d) engaging the gear in the main gear unit when the speed of the lay shaft has been synchronized with the speed of the main shaft at a third point in time.

2 . A method according to claim 1 , further comprising:
detecting the speeds of the respective shafts with a first speed sensor arranged at the input shaft, a second speed sensor arranged at the lay shaft and/or a third speed sensor arranged at the main shaft.

3 . A method according to claim 1 , further comprising:
performing the synchronizing in step b) with a synchronizer arranged at the split gear unit.

4 . A method according to claim 1 , further comprising between the steps c) and d): synchronizing the speed of the lay shaft and the speed of the main shaft by accelerating or decelerating the electric machine between the second point in time (t 2 ) and the third point in time (t 3 ).

5 . A method according to claim 1 , further comprising before step a):
e) disconnecting the combustion engine from the input shaft via operating a coupling device.

6 . A method according to claim 1 , controlling the synchronizing and the shifting via an electronic control device.

7 . A hybrid powertrain comprising elements configured and adapted to perform the method according to claim 1 .

8 . A vehicle, comprising a hybrid powertrain according to claim 7 .

9 . (canceled)

10 . A computer program product, comprising a program for shifting in a vehicle with a hybrid powertrain and the program being stored in a non-transitory medium readable by a computer, wherein the computer program (P) comprises program code to cause an electronic control device, or another computer connected to the electronic control device, to perform the method steps according to claim 1 , when the program code is executed in an electronic control device or in another computer connected to the electronic control device.

Assignees

• Scania Cv Ab

Inventors

• Nilsson Mattias
• Sundén Fredrik
• Liwell Mats
• Kourie Afram

Classifications

• F16H3/091

  including a single countershaft · CPC title

• B60W10/02

  including control of driveline clutches · CPC title

• B60W2710/082

  Speed change rate · CPC title

• B60W2510/1015

  Input shaft speed, e.g. turbine speed · CPC title

• B60W2710/1011

  Input shaft speed, e.g. turbine speed · CPC title