Control unit, drive train, method for operating drive train and motor vehicle

A technology of control unit and drive system, which is applied in the direction of control drive, control system, electric vehicle, etc., and can solve problems such as noise reduction deterioration and noise increase

Pending Publication Date: 2022-01-11
DR ING H C F PORSCHE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practice, however, when the PWM frequency is changed, the noise reduction becomes worse or even increases

Method used

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  • Control unit, drive train, method for operating drive train and motor vehicle
  • Control unit, drive train, method for operating drive train and motor vehicle
  • Control unit, drive train, method for operating drive train and motor vehicle

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Embodiment Construction

[0032] figure 1 A drive train 10 according to an exemplary embodiment of the invention is shown schematically with a control unit 1 according to an exemplary embodiment of the invention. Drive train 10 has, for example, a three-phase electric machine 4 , which is fed with phase currents from inverter 2 . For this purpose, the inverter 2 converts the DC voltage provided by the energy store 5 into AC voltages which, when connected to the terminals of the electric machine 4 , generate phase currents.

[0033] For this purpose, the inverter 2 has a plurality of semiconductor switches, preferably SiC semiconductor switches and / or GaN semiconductor switches. The semiconductor switches are controlled by the control unit 1 by means of pulse width modulation (PWM). When the electric machine 4 is in operation, unpleasant background noise is typically generated. In order to reduce these background noises, the control unit 1 has a noise reduction device 3 . The noise reduction device ...

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PUM

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Abstract

The invention provides a control unit 1 which generates pulse width modulation (PWM) pulses for an inverter 2, in particular a drive train. The control unit has a noise reducer 3 configured to generate an opposing signal for active noise reduction. The noise reducer is configured to set a phase (deltatheta PWM) of the opposing signal as a function of a predefined PWM frequency (F) and/or rotational speed (omegam). The invention further relates to a drive train (10), to a motor vehicle (100) and to a method for operating a drive train (10).

Description

technical field [0001] The invention relates to a control unit for generating PWM pulses for an inverter, in particular an inverter of a drive train, a drive train with an electric machine, a method for operating a drive train and a motorized vehicle. Background technique [0002] Electric machines in motor vehicles are typically fed with three-phase alternating current, ie three phase currents. To feed an electric machine with phase current, an inverter provides an AC voltage that produces the phase current. Here, the alternating voltage is generated by the inverter from the direct voltage provided by the energy store. [0003] In order to convert the DC voltage into AC voltage, the inverter typically has fast-switching semiconductor switches. The desired amplitude and frequency of the phase currents are set by means of these semiconductor switches. [0004] In this case, the semiconductor switches are actuated, for example, by means of pulse width modulation (PWM). In...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P31/00H02P27/08H02M7/48B60L15/00
CPCH02P31/00H02P27/08H02M7/48B60L15/00H02P27/085H02M7/5395H02M1/12H02M1/0025H02M7/53873B60L15/08B60L2270/142H04B15/00H04L27/12
Inventor R·内勒斯J·内格尔克雷默
Owner DR ING H C F PORSCHE AG
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