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An automotive air blower, in particular a supercharger, comprises an air pump, such as an air impeller (2) connected to the output shaft (4) of a transmission system, the input shaft of which is connected, in use, to the engine of a motor vehicle. The input and output shafts (6, 4) are connected to

An automotive air blower, in particular a supercharger, comprises an air pump, such as an air impeller (2) connected to the output shaft (4) of a transmission system, the input shaft of which is connected, in use, to the engine of a motor vehicle. The input and output shafts (6, 4) are connected to respective branches of a three-branch epicyclic differential gearset. The third branch of the gearset and the input shaft (6) are connected to the rotor (20, 22) of respective electrical machines, the electrical connections of the stators (24, 26) of which machines are connected together via a controller (27) arranged to control the flow of electric power between them.

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The invention claimed is: 1. An automotive air blower system, comprising: a supercharger, comprising a centrifugal impeller wheel, connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and

The invention claimed is: 1. An automotive air blower system, comprising: a supercharger, comprising a centrifugal impeller wheel, connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a sun wheel in engagement with a plurality of planet wheels, the planet wheels being carried by a common carrier and in engagement with an annulus wheel, and wherein the sun wheel is connected to the impeller wheel, the annulus wheel is connected to the input shaft, and the carrier is connected to the rotor of the second electrical machine. 2. An automotive air blower system, comprising: a supercharger, comprising a centrifugal impeller wheel, connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a sun wheel in engagement with a plurality of planet wheels, the planet wheels being carried by a common carrier and in engagement with an annulus wheel, and wherein the sun wheel is connected to the impeller wheel, the carrier is connected to the input shaft, and the annulus wheel is connected to the rotor of the second electrical machine. 3. An automotive air blower system, comprising: an air pump connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a sun wheel in engagement with a plurality of planet wheels, the planet wheels being carried by a common carrier and in engagement with an annulus wheel, and wherein the annulus wheel is connected to the air pump, the carrier is connected to the input shaft, and the sun wheel is connected to the rotor of the second electrical machine. 4. An automotive air blower system, comprising: an air pump connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a sun wheel in engagement with a plurality of planet wheels, the planet wheels being carried by a common carrier and in engagement with an annulus wheel, and wherein the carrier is connected to the air pump, the annulus wheel is connected to the input shaft, and the sun wheel is connected to the rotor of the second electrical machine. 5. An automotive air blower system, comprising: an air pump connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a sun wheel in engagement with a plurality of planet wheels, the planet wheels being carried by a common carrier and in engagement with an annulus wheel, and wherein the carrier is connected to the air pump, the sun wheel is connected to the input shaft, and the annulus wheel is connected to the rotor of the second electrical machine. 6. An automotive air blower system, comprising: an air pump connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a sun wheel in engagement with a plurality of planet wheels, the planet wheels being carried by a common carrier and in engagement with an annulus wheel, and wherein the annulus wheel is connected to the air pump, the sun wheel is connected to the input shaft, and the carrier is connected to the rotor of the second electrical machine. 7. An automotive air blower system, comprising: an air pump connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicylic gearset comprises a first sun wheel in engagement with a plurality of first planet wheels, and a second sun wheel in engagement with a plurality of second planet wheels, wherein each first planet wheel is connected to a respective second planet wheel, wherein each connected pair of first and second planet wheels are carried by a respective common planet shaft, wherein the planet shafts are connected to a common carrier, wherein one of the first and second sun wheels is connected to the air pump, wherein the other of the first and second sun wheels is connected to the input shaft, and wherein the carrier is connected to the second electrical machine. 8. An automotive air blower system, comprising: an air pump connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a first sun wheel in engagement with a plurality of first planet wheels, and a second sun wheel in engagement with a plurality of second planet wheels, wherein each first planet wheel is connected to a respective second planet wheel, wherein each connected pair of first and second planet wheels are carried by a respective common planet shaft, wherein each of the planet shafts are connected to a common carrier, wherein one of the first and second sun wheels is connected to the air pump, wherein the carrier is connected to the input shaft, and wherein the other of the first and second sun wheels is connected to the second electrical machine. 9. An automotive air blower system, comprising: an air pump connected to an output shaft of a transmission system, an input shaft of the transmission system being connected, in use, to an engine of a motor vehicle, the input and output shafts being connected to respective branches of a three-branch epicyclic differential gearset, one branch of the gearset and the input shaft being connected to a rotor of respective electrical machines, wherein a first of the electrical machines constitutes a motor/generator and a second of the electrical machines is configured to operate as a generator, wherein each of the first and second electrical machines comprise stators and electrical connections of the stators, wherein the electrical connections of the stators are connected to a controller configured to control a flow of electric power between the first and second electrical machines, wherein the epicyclic gearset comprises a first sun wheel in engagement with a plurality of first planet wheels, and a second sun wheel in engagement with a plurality of second planet wheels, wherein each first planet wheel is connected to a respective second planet wheel, wherein each connected pair of first and second planet wheels are carried by a respective common planet shaft, wherein each of the planet shafts are connected to a common carrier, wherein the carrier is connected to the air pump, wherein one of the first and second sun wheels is connected to the input shaft, and wherein the other of the first and second sun wheels is connected to the second electrical machine.