Browse Prior Art Database

A Method for Determining if a Gearbox in a Hybrid Powertrain is in a Neutral State, a Computer Program and a Computer Program Product

IP.com Disclosure Number: IPCOM000245121D
Publication Date: 2016-Feb-10
Document File: 13 page(s) / 56K

Publishing Venue

The IP.com Prior Art Database

Abstract

ABSTRACT The present solution relates to a method for determining if a gearbox in a hybrid powertrain is in a neutral state. The method comprises the steps of: a) disengage a clutch 5, so that an internal combustion engine 4 is released from an electrical machine 50, b) shift a gearbox 6 into a neutral state, c) rotate the electrical machine 50, and d) measure the torque generated in the electrical machine 50. The solution also relates to a computer program and a computer program product.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 13% of the total text.

A Method for Determining if a Gearbox in a Hybrid Powertrain is in a
Neutral State
, a Computer Program and a Computer Program Product

ABSTRACT

The present solution relates to a method for determining if a gearbox in a hybrid powertrain is in a neutral state. The method comprises thesteps of: a) disengage a clutch 5, so that an internal combustion engine 4 is released from an electrical machine 50, b) shift a gearbox 6 into a neutral state, c) rotate the electrical machine 50, and d) measure the torque generated in the electrical machine 50. The solution also relates to a computer program and a computer program product.

BACKGROUND AND PRIOR ART

Vehicles, and in particular heavy goods vehicles, e.g. trucks, are usually equipped with a gearbox connected to the combustion engine, which gearbox may be automatic, manual or a combination thereof. In an automated manual transmission, a so-called AMT gearbox, the gearbox is controlled by an electronic control device. Such a gearbox may be equipped with a main gearbox device, a split gearbox device and a range gearbox device. In addition to the combustion engine, also an electrical machine may be arranged between the combustion engine and the gearbox. The combustion engine can together with the electrical machine deliver power to the vehicle as a hybrid drive or as an alternative may one of the combustion engine or the electrical machine deliver power to the vehicle.

In gearboxes of this type, the synchronization devices, comprising conical synchronization rings and coupling rings, may be replaced by coupling sleeves provided with splines, which are displaced axially in order to engage with gearwheels placed on shafts in the gearbox. On shifting, the coupling sleeve is displaced axially in order to engage with coupling teeth arranged on a selectable gearwheel, in order to connect the gearwheel to, and rotation lock it, on the shaft.

If a range gearbox device is arranged in the gearbox it is usually provided between the main gearbox device and a propeller shaft coupled to the drive wheels of the vehicle. The range gearbox device is accommodated in a gearbox housing and comprises an input shaft coupled to the main gearbox device, an output shaft and between the input shaft and the output shaft is a planetary gear of the range gearbox device disposed.

When the powertrain is provided with an internal combustion engine and an electrical machine for delivering power to the vehicle as a hybrid drive, the internal combustion engine may be started by means of the electrical machine. However, the internal combustion engine may only be started by means of the electrical machine if there is enough power in an energy storage of the electrical machine. Otherwise, the internal combustion engine must be started by means of a conventional starting engine arranged at the internal combustion engine. However, it is preferred to start the internal combustion engine by means of the electrical machine, since torque and spee...