Traction system for a vehicle

A computer program product to control a drive system for a vehicle, wherein the drive system comprises an output shaft in a combustion engine, an input shaft of a gearbox, a first electrical machine comprising a stator and a rotor, a planetary gear comprising three components in the form of a sun wheel, a ring gear and a planetary wheel carrier, wherein the output shaft of the combustion engine is connected to a first of said components in the planetary gear, so that a rotation of the output shaft leads to a rotation of such first of said components, wherein the input shaft of the gearbox is connected with a second of said components of the planetary gear, so that a rotation of the input shaft of the gear box leads to a rotation of such second of said components, and wherein the rotor of the first electrical machine is connected with a third of said components in the planetary gear, so that a rotation of the rotor of the first electrical machine leads to a rotation of such third of said components, wherein the drive system also comprises a first locking means, which may be moved between a locked position in which two of said components of the planetary gear are locked together, so that the three components of the planetary gear rotate with the same rotational speed, and a release position in which the components of the planetary gear are allowed to rotate at different rotational speeds, wherein the drive system comprises a second electrical machine, with a stator and a rotor, connected to the combustion engine's output shaft between the combustion engine and said first of said components of the planetary gear, and a second locking means which may be moved between a locked position, in which the combustion engine's output shaft is locked to the second electrical machine's rotor and said first of said components of the planetary gear, and a release position, in which the output shaft of the combustion engine is disconnected from the second electrical machine's rotor and said first of said components of the planetary gear, and is allowed to rotate independently of the second electrical machine's rotor and said first of said components of the planetary gear, and

• wherein the computer program product is stored in a non-transitory computer-readable medium and comprises computer-readable program code portions embodied therein, the computer-readable program code portions comprises computer code to cause one or more electronic processors to:
• control fuel supply to the combustion engine and to control exchange of electrical power between the first electrical machine and the second electrical and/or between the first electrical machine and the second electrical machine and at least one electric energy storage device, if the at least one electric energy storage device is present in the drive system,
• control said first and second locking means to be moved between the locked position and the release position and, wherein to move the first and second locking means to the lock position, said at least one control device controls-the combustion engine, and/or the first electrical machine, and/or the second electrical machine to achieve the same rotational speed in the parts that are to be locked together by the respective first and second locking means, and, subsequently, to control the first and second locking means to be moved to the locked position, and, in order to move the first and second locking means to the release position, said at least one control device controls the combustion engine, and/or the first electrical machine, and/or the second electrical machine to achieve torque balance between the parts that are to be released from each other and, subsequently, to control the first and second locking means to be moved to the release position,
• wherein when the vehicle is at a standstill with the combustion engine running at idling engine speed, the first locking means is in a release position, and the second locking means is in a locked position, in order to move the vehicle off with power balance the control device is further adapted to:
• control the first electrical machine to delivery of a torque thereof, so that a requested torque is transmitted to the input shaft of the gearbox;
• control the combustion engine towards and to its idling speed;
• control the second electrical machine to deliver a torque, so that a desired power to an energy storage means and electrical loads comprised in the vehicle are achieved;
• in case the torque available in the combustion engine at idling speed is insufficient to both counteract the reaction torque from the first electrical machine and the torque applied from the second electrical machine, control the combustion engine to increase the engine speed thereof, in order to increase the torque available from the combustion engine;
• and
• control the first locking means to be moved to the locked position, when the input shaft of the gearbox, the rotor of the first electrical machine and the output shaft of the combustion engine rotate with the same rotational speed.

An electronic control device for control of a drive system for a motor vehicle, wherein the drive system comprises an output shaft in a combustion engine, an input shaft of a gearbox, a first electrical machine comprising a stator and a rotor, a planetary gear comprising three components in the form of a sun wheel, a ring gear and a planetary wheel carrier, wherein the output shaft of the combustion engine is connected to a first of said components in the planetary gear, so that a rotation of the output shaft leads to a rotation of such first of said components, wherein the input shaft of the gearbox is connected with a second of said components of the planetary gear, so that a rotation of the input shaft of the gear box leads to a rotation of such second of said components, and wherein the rotor of the first electrical machine is connected with a third of said components in the planetary gear, so that a rotation of the rotor of the first electrical machine leads to a rotation of such third of said components, wherein the drive system also comprises a first locking means, which may be moved between a locked position in which two of said components of the planetary gear are locked together, so that the three components of the planetary gear rotate with the same rotational speed, and a release position in which the components of the planetary gear are allowed to rotate at different rotational speeds, wherein the drive system comprises a second electrical machine, with a stator and a rotor, connected to the combustion engine's output shaft between the combustion engine and said first of said components of the planetary gear, and a second locking means which may be moved between a locked position, in which the combustion engine's output shaft is locked to the second electrical machine's rotor and said first of said components of the planetary gear, and a release position, in which the output shaft of the combustion engine is disconnected from the second electrical machine's rotor and said first of said components of the planetary gear, and is allowed to rotate independently of the second electrical machine's rotor and said first of said components of the planetary gear, and

• wherein said electronic device comprises:
• a storage device;
• an electronic processor operatively coupled to the storage device;
• and
• a computer program product stored in a non-transitory computer-readable medium on the storage device and comprising computer-readable program code portions embodied therein, the computer-readable program code portions comprises computer code to cause one or more electronic processors to:
• control fuel supply to the combustion engine and to control exchange of electrical power between the first electrical machine and the second electrical machine and/or between the first electrical machine and the second electrical machine and at least one electric energy storage device, if the at least one electric energy storage device is present in the drive system,
• control said first and second locking means to be moved between the locked position and the release position and, wherein to move the first and second locking means to the lock position, said at least one control device controls-the combustion engine, and/or the first electrical machine, and/or the second electrical machine to achieve the same rotational speed in the parts that are to be locked together by the respective first and second locking means, and, subsequently, to control the first and second locking means to be moved to the locked position, and, in order to move the first and second locking means to the release position, said at least one control device controls the combustion engine, and/or the first electrical machine, and/or the second electrical machine to achieve torque balance between the parts that are to be released from each other and, subsequently, to control the first and second locking means to be moved to the release position,
• wherein when the vehicle is at a standstill with the combustion engine running at idling engine speed, the first locking means is in a release position, and the second locking means is in a locked position, in order to move the vehicle off with power balance the control device is further adapted to:
• control the first electrical machine to delivery of a torque thereof, so that a requested torque is transmitted to the input shaft of the gearbox;
• control the combustion engine towards and to its idling speed;
• control the second electrical machine to deliver a torque, so that a desired power to an energy storage means and electrical loads comprised in the vehicle are achieved;
• in case the torque available in the combustion engine at idling speed is insufficient to both counteract the reaction torque from the first electrical machine and the torque applied from the second electrical machine, control the combustion engine to increase the engine speed thereof, in order to increase the torque available from the combustion engine;
• and
• control the first locking means to be moved to the locked position, when the input shaft of the gearbox, the rotor of the first electrical machine and the output shaft of the combustion engine rotate with the same rotational speed.

A vehicle comprising a drive system,

• wherein the drive system comprises an output shaft in a combustion engine, an input shaft of a gearbox, a first electrical machine comprising a stator and a rotor, a planetary gear comprising three components in the form of a sun wheel, a ring gear and a planetary wheel carrier, wherein the output shaft of the combustion engine is connected to a first of said components in the planetary gear, so that a rotation of the output shaft leads to a rotation of such first of said components, wherein the input shaft of the gearbox is connected with a second of said components of the planetary gear, so that a rotation of the input shaft of the gear box leads to a rotation of such second of said components, and wherein the rotor of the first electrical machine is connected with a third of said components in the planetary gear, so that a rotation of the rotor of the first electrical machine leads to a rotation of such third of said components, wherein the drive system also comprises a first locking means, which may be moved between a locked position in which two of said components of the planetary gear are locked together, so that the three components of the planetary gear rotate with the same rotational speed, and a release position in which the components of the planetary gear are allowed to rotate at different rotational speeds, wherein the drive system comprises a second electrical machine, with a stator and a rotor, connected to the combustion engine's output shaft between the combustion engine and said first of said components of the planetary gear, and a second locking means which may be moved between a locked position, in which the combustion engine's output shaft is locked to the second electrical machine's rotor and said first of said components of the planetary gear, and a release position, in which the output shaft of the combustion engine is disconnected from the second electrical machine's rotor and said first of said components of the planetary gear, and is allowed to rotate independently of the second electrical machine's rotor and said first of said components of the planetary gear, and
• wherein said vehicle comprises an electronic device comprising:
• a storage device;
• an electronic processor operatively coupled to the storage device;
• and
• a computer program product stored in a non-transitory computer-readable medium on the storage device and comprising computer-readable program code portions embodied therein, the computer-readable program code portions comprises computer code to cause one or more electronic processors to:
• control fuel supply to the combustion engine and to control exchange of electrical power between the first electrical machine and the second electrical machine and/or between the first electrical machine and the second electrical machine and at least one electric energy storage device, if the at least one electric energy storage device is present in the drive system,
• control said first and second locking means to be moved between the locked position and the release position and, wherein to move the first and second locking means to the lock position, said at least one control device controls-the combustion engine, and/or the first electrical machine, and/or the second electrical machine to achieve the same rotational speed in the parts that are to be locked together by the respective first and second locking means, and, subsequently, to control the first and second locking means to be moved to the locked position, and, in order to move the first and second locking means to the release position, said at least one control device controls the combustion engine, and/or the first electrical machine, and/or the second electrical machine to achieve torque balance between the parts that are to be released from each other and, subsequently, to control the first and second locking means to be moved to the release position,
• wherein when the vehicle is at a standstill with the combustion engine running at idling engine speed, the first locking means is in a release position, and the second locking means is in a locked position, in order to move the vehicle off with power balance the control device is further adapted to:
• control the first electrical machine to delivery of a torque thereof, so that a requested torque is transmitted to the input shaft of the gearbox;
• control the combustion engine towards and to its idling speed;
• control the second electrical machine to deliver a torque, so that a desired power to an energy storage means and electrical loads comprised in the vehicle are achieved;
• in case the torque available in the combustion engine at idling speed is insufficient to both counteract the reaction torque from the first electrical machine and the torque applied from the second electrical machine, control the combustion engine to increase the engine speed thereof, in order to increase the torque available from the combustion engine;
• and
• control the first locking means to be moved to the locked position, when the input shaft of the gearbox, the rotor of the first electrical machine and the output shaft of the combustion engine rotate with the same rotational speed.