A method of braking a vehicle towards stop
AssigneeScania CV AB
InventorsJohan LINDSTROM, Mathias BJORKMAN, Mikael BERGQUIST, Niklas PETTERSSON
Life of this patent
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Abstract
Disclosed is a method for control of a vehicle with a drive system comprising a planetary gear and a first and second electrical machine, connected with their rotors to the components of the planetary gear, a braking of the vehicle towards stop occurs by way of a distribution of the desired braking torque between the first and the second electrical machines, and wherein such electrical machines are controlled to transmit a total torque to an output shaft of the planetary gear, which corresponds to the desired braking torque at least to one predetermined low speed limit, before the vehicle stops.
Claims9
A method for control of a vehicle with a drive system comprising a planetary gear which comprises three components in the form of a sun wheel, a ring gear and planetary wheel carrier, wherein a first input shaft in the planetary gear is connected with a first of said components of the planetary gear, so that a rotation of such shaft leads to a rotation of such first of said components, wherein a second output shaft of the planetary gear is connected with a second of said components in the planetary gear, for transmission of torque for the propulsion of the vehicle, so that a rotation of such shaft leads to a rotation of such second of said components, wherein the drive system comprises a first electrical machine with a stator and a rotor, which is connected with a third of said components of the planetary gear, so that a rotation of the rotor leads to a rotation of such third of said components, and wherein the drive system also comprises a first locking means, which may be moved between a locked position in which two of said components are locked together, so that the three components rotate with the same rotational speed, and a release position in which the components are allowed to rotate with different rotational speeds, wherein the vehicle is controlled, whose drive system also comprises a second electrical machine with a stator and a rotor, connected with said input shaft of the planetary gear, and at least one energy storage means, arranged for exchange of energy between this and the first and second electrical machines, and/or a controllable energy consumer, and in that the method comprises the following steps in order to brake the vehicle towards a stop, when the vehicle is driven with the first locking means in a locked position:
- a) distribution of the desired braking torque between the first and the second electrical machines;
- and
- b) controlling the first and second electrical machines to transmit a total torque to said output shaft of the planetary gear, which corresponds to the desired braking torque at least to a predetermined low speed limit, before the vehicle stops.
(canceled)
A computer program product for braking a vehicle towards a stop, when the vehicle is driven with a first locking means in a locked position,
- wherein the vehicle comprises a drive system comprising a planetary gear which comprises three components in the form of a sun wheel, a ring gear and planetary wheel carrier, wherein a first input shaft in the planetary gear is connected with a first of said components of the planetary gear, so that a rotation of such shaft leads to a rotation of such first of said components, wherein a second output shaft of the planetary gear is connected with a second of said components in the planetary gear, for transmission of torque for the propulsion of the vehicle, so that a rotation of such shaft leads to a rotation of such second of said components, wherein the drive system comprises a first electrical machine with a stator and a rotor, which is connected with a third of said components of the planetary gear, so that a rotation of the rotor leads to a rotation of such third of said components, and wherein the drive system also comprises the first locking means, which may be moved between a locked position in which two of said components are locked together, so that the three components rotate with the same rotational speed, and a release position in which the components are allowed to rotate with different rotational speeds, wherein the vehicle is controlled, whose drive system also comprises a second electrical machine with a stator and a rotor, connected with said input shaft of the planetary gear, and at least one energy storage means, arranged for exchange of energy between this and the first and second electrical machines, and/or a controllable energy consumer,
- 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 comprises computer code to cause an electronic processor to:
- a) distribute the desired braking torque between the first and the second electrical machines;
- and
- b) control the first and second electrical machines to transmit a total torque to said output shaft of the planetary gear, which corresponds to the desired braking torque at least to a predetermined low speed limit, before the vehicle stops.
An electronic control device for braking a vehicle towards a stop, when the vehicle is driven with a first locking means in a locked position,
- wherein the vehicle comprises a drive system comprising a planetary gear which comprises three components in the form of a sun wheel, a ring gear and planetary wheel carrier, wherein a first input shaft in the planetary gear is connected with a first of said components of the planetary gear, so that a rotation of such shaft leads to a rotation of such first of said components, wherein a second output shaft of the planetary gear is connected with a second of said components in the planetary gear, for transmission of torque for the propulsion of the vehicle, so that a rotation of such shaft leads to a rotation of such second of said components, wherein the drive system comprises a first electrical machine with a stator and a rotor, which is connected with a third of said components of the planetary gear, so that a rotation of the rotor leads to a rotation of such third of said components, and wherein the drive system also comprises the first locking means, which may be moved between a locked position in which two of said components are locked together, so that the three components rotate with the same rotational speed, and a release position in which the components are allowed to rotate with different rotational speeds, wherein the vehicle is controlled, whose drive system also comprises a second electrical machine with a stator and a rotor, connected with said input shaft of the planetary gear, and at least one energy storage means, arranged for exchange of energy between this and the first and second electrical machines, and/or a controllable energy consumer,
- 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 comprises computer code to cause an electronic processor to:
- a) distribute desired braking torque between the first and the second electrical machines;
- and
- b) control the first and second electrical machines to transmit a total torque to said output shaft of the planetary gear, which corresponds to the desired braking torque at least to a predetermined low speed limit, before the vehicle stops.
Dependencies are inferred from the claim text.