Method for controlling the operation of an arrangement of at least two electric machines, and motor vehicle

Abstract

The invention relates to a method for controlling the operation of an arrangement of at least two electric machines (6) which are coupled to different wheels (2) of a motor vehicle (1) so as to move together with said wheels and which are connected to a battery (9), said battery (9) providing a current minimum and a current maximum limiting current (24) for the electric machines (6). Target torques (15, 16) are provided for the electric machines (6) by a drive control logic system (14). A target current resulting from the target torque (15, 16) is ascertained for each electric machine (6), and the sum of the target currents of the electric machines (6) are compared with the maximum and the minimum limiting current (24). If the sum lies outside of the interval defined by the limiting currents (24), the target currents are adjusted using at least one change rule (25) such that the sum of the target currents lies within the limiting currents (24), and adjusted target torques (26, 27) are determined from the adjusted target currents and used to control the electric machines (6).

Description

technical field [0001] The invention relates to a method for controlling the operation of a system of at least two electric motors kinematically coupled to different wheels of a motor vehicle and connected to a battery which supplies the electric motors with a current minimum limiting current and the current maximum limit current, wherein the expected torque is provided for the motor by the drive control logic device. Furthermore, the invention relates to a motor vehicle. Background technique [0002] In the field of motor vehicles, drives are proposed not only for electric vehicles but also for hybrid vehicles, in which at least two wheels, in particular all four wheels, of the axle of the motor vehicle are each assigned an electric motor, so that the arrangement can be independently driven Motor vehicle wheels on the same axle. The targeted acceleration of the individual wheels is useful in the operation of several driver assistance systems, for example in antilock braki...

AI Technical Summary

Problems solved by technology

[0004] However with respect to electric torque vectoring there is always a problem in the environment where the battery used for the drive of the motor - especially a high volt battery - is either full or empty and thus occupies a defined state of charge in which In the state, the charge current and discharge current are greatly limited

That is to say that the actual current is shifted in such a way that a control delay via communication always exists on the unimportant side of the battery current, however, the serious disadvantage arises that a control delay occurs due to the time required for bus communication, which May cause undesired effects and lead to limitations on comfort

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