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Motor vehicle with a turbocharger

IP.com Disclosure Number: IPCOM000124720D
Publication Date: 2005-May-04
Document File: 3 page(s) / 62K

Publishing Venue

The IP.com Prior Art Database

Abstract

A motor vehicle with an internal combustion engine is described, wherein a compressor, driven by a Variable Geometry Turbine VGT, is arranged to drive air into the engine. Exhaust gases flowing through the stator-vanes of the VGT acts with a force on the turbine, which force acts to rotate the turbocharger. A combined generator/motor is also arranged to be driven by the VGT. The generated amount of electric energy from the generator may be controlled by controlling the stator-vane positions in the VGT. By closing the stator-vanes in the VGT to a certain position the force of the exhaust gases acting to rotate the turbine, increases. This increase in the force acting to rotate the VGT makes it necessary to brake the VGT harder with the generator/motor and thus produce more electric power for electrical power consumers on board the motor vehicle.

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Motor vehicle with a turbocharger

In order to increase the output power of an internal combustion engine it is possible to arrange an exhaust gas turbocharger on the internal combustion engine driven by the exhaust gases of the engine. Such an exhaust gas turbochargers increase the amount of air that is compressed into the engine and in this way the power of the engine is increased.

In the US Patent Application 2002/0040581 A1 an exhaust gas turbocharger for an internal combustion engine is described. The engine comprises an exhaust gas turbo­charger and an electric motor integrated in the turbocharger. The turbocharger comprises an exhaust gas turbine and a compressor wheel in the intake section of the internal combustion section, which compressor wheel is driven by the exhaust gas turbine. By actuating the electric motor energy is additionally supplied to the exhaust gas turbo­charger so that the compressor is driven additionally and a desired boost pressure level can be obtained. The electric motor can also be used as a generator, when the energy obtained from the exhaust gas turbine is greater than the energy required in the compressor for generating the necessary boost pressure. According to the above US Patent Application 2002/0040581 the exhaust gas turbine may be of the type Variable Geometry Turbine (VGT) in which positions of the stator-vanes of the VGT may be adjusted.

The present invention is directed towards a motor vehicle with an internal combustion engine wherein a compressor, driven by a VGT, is arranged to drive air into the en­gine. Exhaust gases flowing through the stator-vanes of the VGT acts with a force on the turbine, which force acts to rotate the turbocharger. A generator/motor is also arranged to be driven by the VGT. According to the present invention it has been realised that the generated amount of electric energy from the generator may be controlled by controlling the stator-vane positions in a VGT. By closing the stator-vanes in the VGT to a certain position the force of the exhaust gases acting to rotate the VGT, increases. This increase in the force acting to rotate the VGT makes it necessary to brake the VGT harder with the generator/motor and thus produce more electric power for electrical power consumers on board the motor vehicle.

Fig 1 shows an internal combustion engine 1 on which a compressor 2 is arranged for pumping in air into the engin...