Method for checking a connection between a low-voltage supply system and a battery, and motor vehicle
A low-voltage power grid and motor vehicle technology, which is used in the field of checking the connection between the low-voltage power grid and the battery and the motor vehicle field, can solve problems such as the impact of current fluctuations, and achieve the effect of reducing the impact and reducing the amplitude.
Active Publication Date: 2016-09-14
AUDI AG
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Problems solved by technology
Additionally, cable connections have an effect on current fluctuations
Method used
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Embodiment Construction
[0027] figure 1 The connection of the power grid in the motor vehicle according to the invention and the functional interaction used in the method according to the invention are shown in rough schematic form. In this case, a low-voltage network 1 is firstly provided, which in this case is at a voltage of 12V. The low-voltage network 1 is supplied by a battery 2 , here a lead-acid battery. A starter 3 and a further load 4 are shown schematically as loads of the low-voltage network 1 .
[0028] The low-voltage network 1 is connected via a DC transformer 5 to a high-voltage network 6 , which is only schematically shown here, and whose voltage is higher than the voltage of the low-voltage network. Energy can be exchanged between the low-voltage grid 1 and the high-voltage grid 6 via the DC transformer 5 .
[0029] A current sensor 7 and a voltage sensor 8 , which can be read out by a battery control unit 9 , are provided on the battery 2 . In this case, the current sensor 7 is...
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Method for checking a connection between a battery (2) which supplies a low-voltage supply system (1) of a motor vehicle (12), the voltage of said low-voltage supply system being lower than the voltage of a high-voltage supply system (6) of the motor vehicle (12), and the low-voltage supply system (1), wherein a DC voltage converter (5) which is designed to interchange electrical energy between the high-voltage supply system (6) and the low-voltage supply system (1) connects the high-voltage supply system (6) to the low-voltage supply system (1), wherein the DC voltage converter (5) modulates the output voltage into the low-voltage supply system at a modulation frequency, wherein the current impressed by this and the voltage impressed by this are measured by the battery (2), and a resistance value is determined and evaluated with respect to at least one connection criterion according to which a connection fault is identified when at least one connection criterion is not fulfilled.
Description
technical field [0001] The invention relates to a method for checking the connection between a battery supplying a low-voltage network of a motor vehicle and a low-voltage network, the voltage of which is lower than the voltage of the high-voltage network of the motor vehicle, wherein a DC transformer is connected to the high-voltage network With the low-voltage grid, the DC transformer is designed for exchanging electrical energy between the high-voltage grid and the low-voltage grid. Furthermore, the invention relates to a motor vehicle. Background technique [0002] Modern motor vehicles often have an on-board electrical system, which is powered by a battery. The voltage level of such known on-board electrical systems generally lies at approximately 12V. More recently, however, there have been numerous applications in which loads operated at higher voltages are provided, especially in applications where the electric motor is used as a separate or additional drive of a m...
Claims
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IPC IPC(8): B60L3/00G01R31/36G01R27/08G01R31/00G01R31/02G01R31/04
CPCB60L58/10G01R31/006G01R31/52G01R31/54Y02T10/70B60L3/0046
Inventor K·巴尔斯R·诺曼T·哈克纳
Owner AUDI AG