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Method for preventing overvoltages in an electrical system of a motor vehicle

A motor vehicle, overvoltage technology, which is applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device, etc. for limiting overcurrent/overvoltage, and can solve problems such as voltage rise and excitation current reduction

Active Publication Date: 2013-03-06
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

If the rotational speed is now increased relatively quickly, the field current cannot be reduced correspondingly quickly, so that the voltage suddenly rises

Method used

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  • Method for preventing overvoltages in an electrical system of a motor vehicle

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Embodiment Construction

[0022] figure 1 An electrical machine is shown in the form of a circuit diagram, which may be the basis of the invention and is generally designated by the reference numeral 100 . The electric machine has a generator assembly 10 and a rectifier assembly 20 . The electric machine is usually used as a generator for feeding the on-board electrical system of the motor vehicle. During generator operation of the electric machine, the rectifier assembly is operated as a rectifier, for example as a synchronous rectifier, and the electric machine, more precisely the rotor winding 12 , is driven by the internal combustion engine of the motor vehicle. For this purpose, rotor winding 12 is usually connected to a crankshaft (not shown) of the internal combustion engine, for example via a drive belt. n for crankshaft speed K to represent, the motor speed is n G To represent.

[0023] The generator assembly 10 is shown only schematically in the form of a star-connected stator winding 11...

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Abstract

A method for preventing overvoltages in an electrical system of a motor vehicle is provided. The electrical system has as voltages sources an electric machine (100) coupled to an internal combustion engine and a motor vehicle battery (30). The electric machine has a stator winding (11), a rotor winding (12) and a field regulator (15) assigned to the rotor winding (12) for controlling a field current flowing through the rotor winding. The voltage generated by the electric machine (100) is limited to an upper voltage threshold value if a rotational speed (nK) corresponding to the rotational speed (nG) of the electric machine is below a rotational speed threshold value, and a temperature (TK) corresponding to the temperature of the motor vehicle battery (30) is below a temperature threshold value.

Description

technical field [0001] The invention relates to a method for avoiding overvoltages in an electrical circuit of a motor vehicle and to a computing unit provided for carrying out the method. Background technique [0002] Toothed electrode generators with electrical excitation are frequently used in motor vehicles as electrical machines (generators, vehicle generators). The current flowing through the rotor winding is used as a manipulated variable for setting the desired output voltage and is predetermined by the associated field regulator. The regulation prevents, for example, the fact that, with very different motor speeds, the generator supplies wildly fluctuating voltage values, which could damage downstream electrical equipment. These field regulators are nowadays usually part of so-called generator regulators, such as the Applicant's Multi-Function Regulator (MFR), which also perform other regulating functions in addition to voltage regulation. [0003] The adjustment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/48
CPCH02P9/48H02H9/04
Inventor R.赫比希H.拉比茨克
Owner ROBERT BOSCH GMBH
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