DE102012216471A1 - Safety device i.e. external, secure functioning device for checking high volt network of motor car at absence of voltage, has computer device determining predominating voltage level of network, and checking network at absence of voltage - Google Patents

Abstract

The device (100) has an interface unit (110) couplable to a high volt network (20) of a motor vehicle (10), and a sensor device (120) connected with the interface unit and detecting an operating mode of the network over the interface unit. A computer device (130) determines a predominating voltage level of the network based on the detected operating mode, and checks the network at absence of voltage by a comparison of the determined voltage level with a reference value. A warning apparatus emits a warning signal when no absence of voltage is present. The warning apparatus is designed as an optical warning apparatus e.g. warning lamp such as LED or incandescent lamp, and an acoustic warning apparatus i.e. buzzer. The sensor device is designed as a voltmeter or an ammeter. An independent claim is also included for a method for checking a high volt network of a motor vehicle at absence of voltage.

Description

The invention relates to a safety device for checking a high-voltage network of a motor vehicle to zero voltage and a method for checking a high-voltage network of a motor vehicle to de-energize.

State of the art

The DE 10 2010 036 379 A1 describes a battery of a motor vehicle, with at least two battery modules, which are connected by at least one electrical connection, and a safety mechanism having at least one separating means, which is arranged in a normal operation of the battery modules outside the electrical connection and in an accident, the electrical connection between separates the two battery modules, whereby a high voltage is prevented within the battery.

The DE 10 2007 047 713 A1 describes a method and an associated device for discharging a high-voltage network of a hybrid vehicle, in particular a DC intermediate circuit of a hybrid vehicle, are used for discharging the capacity of the high-voltage network switching means, which are between the capacities and at least one pre-charge and a high-voltage battery and the switching means switch with specifiable Arrangement of the switching contacts or switching devices or relays or contactors are that can be switched by means of a control device. The actuation of the switching devices is carried out so that the at least one precharge resistor is used simultaneously for the charging and the discharge of the DC voltage intermediate circuit.

The US 2009/0159311 A1 describes a vehicle battery system having a plurality of vehicle battery cells. The individual vehicle battery cells are coupled to each other via electrical conductors, wherein the electrical conductors are designed to be separable, in order to provide an interruption in the event of an accident.

The US 2009/1039781 A1 describes a motor vehicle with a battery to provide a supply of electrical energy, with an electric motor to drive the motor vehicle, and with a first control circuit connected between the battery and the motor to control the flow of electric power provided to the motor vehicle To control energy.

The battery is embedded in the motor vehicle described therein in a battery mounting device, wherein a plurality of battery cells of the battery are connected to the battery mounting device via fragile connecting wires, so that when occurring and acting on the battery mounting device and the battery cells acceleration forces the fragile connecting wires, which formed of a thin wire are to be interrupted.

Disclosure of the invention

The present invention provides a safety device for checking a high-voltage network of a motor vehicle to freedom from voltage with the features of claim 1 and a method for checking a high-voltage network of a motor vehicle to de-energize according to claim 13.

Advantages of the invention

The idea of the present invention is to detect the state of a high-voltage network or a high-voltage vehicle electrical system of a motor vehicle and to represent it by a vehicle-external component in the form of the safety device.

The essence of the invention is that the review of the state of the high-voltage network is not performed by the on-board diagnostic options, which by a breakdown of the motor vehicle, such as a malfunction or accident or in the course of bridging when performing a repair to the motor vehicle in Their function could be impaired, but that the diagnosis of the high-voltage network or the high-voltage electrical system of the motor vehicle can be performed with an external, safely functioning device in the form of the safety device.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures.

According to one embodiment of the invention, it is provided that the safety device further comprises a switching device which is designed, if there is no lack of voltage of the high-voltage network of the motor vehicle, to discharge the high-voltage network of the motor vehicle. This can advantageously be ensured by the safety device a safe electrical discharge of the high-voltage network.

According to one embodiment of the invention, it is provided that the switching device is designed to discharge the high-voltage network of the motor vehicle via load resistances of the safety device. This allows a safe way to ensure that the system is de-energized.

According to one embodiment of the invention it is provided that the switching device is designed to discharge the high-voltage network of the motor vehicle via load circuits of the motor vehicle. As a result, by using existing load circuits of the motor vehicle, the high-voltage network can be safely and easily discharged.

According to one embodiment of the invention it is provided that the safety device further comprises a warning device which is designed to emit a warning signal if there is no lack of voltage of the high-voltage network of the motor vehicle. As a result, persons in the vicinity of the motor vehicle can be reliably warned of a lack of voltage freedom of the high-voltage network of the motor vehicle.

According to one embodiment of the invention it is provided that the warning device is designed as an optical warning device. This allows a simple and widely visible warning of a lack of voltage freedom of the high-voltage network of the motor vehicle.

According to one embodiment of the invention it is provided that the warning device is designed as an acoustic warning device. This allows a simple and well-perceptible warning of a lack of voltage freedom of the high-voltage network of the motor vehicle.

According to one embodiment of the invention, it is provided that the sensor device is also designed to check an interlock loop of the high-voltage network of the motor vehicle and to detect a result of the checking as the at least one operating state of the high-voltage network of the motor vehicle.

According to one embodiment of the invention, it is provided that the interface device has electrical contacts for a positive pole of the high-voltage network, for a negative pole of the high-voltage network, for a mass of the motor vehicle and for an interlock loop of the high-voltage network. As a result, the operating states of the high-voltage network of the motor vehicle can be detected reliably and completely.

According to one embodiment of the invention, it is provided that the computer device is further configured to determine via the electrical contacts whether an electrical voltage is applied to the high-voltage network of the motor vehicle, or if the high-voltage network of the motor vehicle is short-circuited to the mass of the motor vehicle, or if the mass of the motor vehicle is under tension with respect to the earth or whether a line of the high-voltage network secured with the interlock loop of the high-voltage network is damaged.

According to one embodiment of the invention, it is provided that the safety device is designed to short-circuit the positive pole of the high-voltage network and the negative pole of the high-voltage network. As a result, the absence of voltage of the high-voltage network can be ensured and rescue workers or workshop personnel can be safely protected from voltage-carrying components of the high-voltage network.

According to one embodiment of the invention, it is provided that the safety device is designed to short-circuit the high-voltage network and the mass of the motor vehicle. As a result, the absence of voltage of the high-voltage network of the motor vehicle relative to the mass of the motor vehicle can be ensured even in further repair work or other uses on the high-voltage network of the motor vehicle.

The described embodiments and developments can be combined with each other as desired.

Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments.

Brief description of the drawings

The accompanying drawings are intended to provide further understanding of the embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain principles and concepts of the invention.

Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The illustrated elements of the drawings are not necessarily shown to scale to each other.

Show it:

1 a schematic representation of a safety device for testing a high-voltage network of a motor vehicle to de-energize according to an embodiment of the invention;

2 a schematic representation of a safety device for testing a high-voltage network of a motor vehicle to de-energize according to another embodiment of the invention; and

3 a schematic representation of a flowchart of a method for checking a high-voltage network of a motor vehicle to de-energize according to yet another embodiment of the invention.

In the figures of the drawing, like reference numerals designate the same or functionally identical elements, components, components or method steps, unless indicated otherwise.

The 1 shows a schematic representation of a safety device for testing a high-voltage network of a motor vehicle to de-energize according to an embodiment of the invention.

A security device 100 includes, for example, an interface device 110 , a sensor device 120 and a computing device 130 ,

The interface device 110 is connected to a high voltage network 20 a motor vehicle 10 coupled.

The high voltage network 20 of the motor vehicle 10 can thereby electrical leads to individual electrical components of the motor vehicle 10 and the electrical leads may be via one or more interlock loops 40 be assured.

The interface device 110 can also provide electrical connections for checking the interlock loop 40 exhibit. The interlock loop 40 For example, are formed as a continuous electrical lines, which in addition to the electrical leads in the high-voltage network 20 of the motor vehicle 10 built-in electrical load component are arranged and which also suffer an interruption in the event of departure of the electrical leads and thereby detection of a malfunction of the high-voltage network 20 of the motor vehicle 10 enable.

The sensor device 120 is designed, for example, via the interface device 110 at least one operating state of the high-voltage network 20 of the motor vehicle 10 capture. The sensor device 120 can be designed as a voltage meter or ammeter.

The computer device 130 For example, it is designed, based on the at least one detected operating state, a prevailing voltage value of the high-voltage network 20 to determine and the absence of voltage of the high-voltage network 20 of the motor vehicle 10 by a comparison of the determined voltage value with a reference value, the absence of voltage of the high-voltage network 20 of the motor vehicle 10 to check.

The reference values are for example in one in the computer device 130 integrated memory device stored. The memory device is designed, for example, as a semiconductor memory which is constructed from a semiconductor, wherein microelectronic memory structures are realized in and on a semiconductor crystal.

For example, a voltage of less than 40 volts, or less than 9 volts, or less than 1 volts is stored as a reference. In this case, the reference value to characteristics of the high-voltage network 20 or to prevailing environmental conditions, such as atmospheric humidity, from the sensor device 120 be adjusted.

As the detected operating state of the high-voltage network 20 of the motor vehicle 10 For example, a current, an open circuit voltage of a high-voltage memory of the high-voltage network 20 or any other current or voltage value of the high-voltage network 20 be used.

The computer device 130 and the sensor device 120 For example, they are designed as a processor unit or as another electronic data processing unit. The computer device 130 is, for example, as a microcontroller, also μController, formed, which unites not only a processor but also units for peripheral functions on a chip.

The 2 shows a schematic representation of a safety device for testing a high-voltage network of a motor vehicle to freedom from voltage according to another embodiment of the invention.

Notwithstanding the in the 1 shown embodiment of the safety device 100 points at in the 2 shown embodiment, the safety device 100 Furthermore, a switching device 140 and a warning device 150 on.

The switching device 140 and the warning device 150 can do this with the computer device 130 be coupled. The warning device 140 For example, it is designed as a buzzer or buzzer or as another electrically controlled acoustic signal generator which generates a buzzing or beeping sound.

Furthermore, the warning device 150 as a warning light or as another optical warning device 150 in the form of a light-emitting diode or a light bulb or other light source be formed, which serves to a dangerous situation or even a dangerous condition or a dangerous condition or the lack of voltage isolation of the high-voltage network 20 of the motor vehicle 10 to draw attention.

The switching device 140 is for example designed to, if no voltage isolation of the high-voltage network 20 of the motor vehicle 10 present, the high-voltage network 20 of the motor vehicle 10 to unload.

The switching device 140 is designed, for example, as a power transistor, for example as a transistor for switching or controlling large voltages, currents or powers.

The switching device 140 is designed, for example, to the high-voltage network 20 of the motor vehicle 10 via load resistances 145 the safety device 100 to unload.

Furthermore, the switching device 140 be designed to the high-voltage network 20 of the motor vehicle 10 over the load circuits 30 of the motor vehicle 10 to unload.

The warning device 150 can be designed to, if no voltage isolation of the high-voltage network 20 of the motor vehicle 10 is present to send a warning signal.

The others in the 2 Reference numerals shown are already in the to 1 associated figure description and are therefore not further explained.

The 3 shows a schematic representation of a flowchart of a method for checking a high-voltage network of a motor vehicle to de-energize according to yet another embodiment of the invention.

As a first method step, coupling S1 of a safety device takes place 100 to a motor vehicle 10 ,

As a second method step, detection S2 of at least one operating state of the high-voltage network takes place 20 of the motor vehicle 10 by a sensor device 120 the safety device coupled to the motor vehicle 100 ,

As a third method step, a determination S3 of a prevailing voltage value of the high-voltage network takes place 20 based on the at least one detected operating state and checking the absence of voltage of the high-voltage network 20 of the motor vehicle 10 by comparing the determined voltage value with a reference value.

The method steps can be repeated iteratively or recursively in any order.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto, but modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102010036379 A1 [0002]
• DE 102007047713 A1 [0003]
• US 2009/0159311 A1 [0004]
• US 2009/1039781 A1 [0005]

Claims (13)

Safety device ( 100 ) for checking a high-voltage network ( 20 ) of a motor vehicle ( 10 ) to zero voltage, with: - an interface device ( 110 ) connected to the high-voltage network ( 20 ) of the motor vehicle ( 10 ) can be coupled; A sensor device ( 120 ) connected to the interface device ( 110 ) and which is adapted, via the interface device ( 110 ) at least one operating state of the high-voltage network ( 20 ) of the motor vehicle ( 10 ) capture; and a computer device ( 130 ), which is designed, based on the at least one detected operating state, a prevailing voltage value of the high-voltage network ( 20 ) and by comparing the determined voltage value with a reference value, the high-voltage network ( 20 ) of the motor vehicle ( 10 ) to check for no voltage. Safety device ( 100 ) according to claim 1, wherein the security device ( 100 ) a switching device ( 140 ), which is designed to, if no lack of voltage of the high-voltage network ( 20 ) of the motor vehicle ( 10 ), the high-voltage network ( 20 ) of the motor vehicle ( 10 ) to unload. Safety device ( 100 ) according to claim 2, wherein the switching device ( 140 ) is adapted to the high-voltage network ( 20 ) of the motor vehicle ( 10 ) via load resistances ( 145 ) of the switching device ( 140 ) to unload. Safety device ( 100 ) according to claim 2, wherein the switching device ( 140 ) is adapted to the high-voltage network ( 20 ) of the motor vehicle ( 10 ) via load circuits of the motor vehicle ( 10 ) to unload. Safety device ( 100 ) according to one of claims 1 and 2, wherein the safety device ( 100 ) a warning device ( 150 ), which is designed to, if no lack of voltage of the high-voltage network ( 20 ) of the motor vehicle ( 10 ) is present to send a warning signal. Safety device ( 100 ) according to claim 5, wherein the warning device ( 150 ) as an optical warning device ( 150 ) is trained. Safety device ( 100 ) according to claim 5, wherein the warning device ( 150 ) as an acoustic warning device ( 150 ) is trained. Safety device ( 100 ) according to one of the preceding claims, wherein the sensor device ( 120 ) is further adapted to provide an interlock loop ( 40 ) of the high-voltage network ( 20 ) of the motor vehicle ( 10 ) and a result of the checking as the at least one operating state of the high-voltage network ( 20 ) of the motor vehicle ( 10 ) capture. Safety device ( 100 ) according to one of the preceding claims, wherein the interface device ( 110 ) electrical contacts for a positive pole of the high-voltage network ( 20 ), for a negative pole of the high-voltage network ( 20 ), for a mass of the motor vehicle ( 10 ) and for an interlock loop ( 40 ) of the high-voltage network ( 20 ) having. Safety device ( 100 ) according to claim 9, wherein the computer device ( 130 ), further adapted to determine via the electrical contacts, whether an electrical voltage at the high-voltage network ( 20 ) of the motor vehicle ( 10 ) or whether the high-voltage network ( 20 ) of the motor vehicle ( 10 ) with the mass of the motor vehicle ( 10 ) is short-circuited, or whether the mass of the motor vehicle ( 10 ) is under tension with respect to the earth or whether one with the interlock loop ( 40 ) of the high-voltage network ( 20 ) secured line of the high-voltage network ( 20 ) has damage. Safety device ( 100 ) according to one of claims 9 and 10, wherein the safety device ( 100 ) is adapted to the positive pole of the high-voltage network ( 20 ) and the negative terminal of the high-voltage network ( 20 ) short circuit. Safety device ( 100 ) according to one of claims 9 and 10, wherein the safety device ( 100 ) is adapted to the high-voltage network ( 20 ) and the mass of the motor vehicle ( 10 ) short circuit. Method for checking a high-voltage network ( 20 ) of a motor vehicle ( 10 ) to freedom from stress with the following method steps: - coupling (S1) of a safety device ( 100 ) to a motor vehicle ( 10 ); Detecting (S2) at least one operating state of the high-voltage network ( 20 ) of the motor vehicle ( 10 ) by a sensor device ( 120 ) the safety device coupled to the motor vehicle ( 100 ); and - determining (S3) a prevailing voltage value of the high-voltage network ( 20 ) based on the at least one detected operating state and checking the high-voltage network ( 20 ) of the motor vehicle ( 10 ) to freedom from voltage by comparing the determined voltage value with a reference value.

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