BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a tank system for a vehicle, including an extraction device and a tank, wherein the extraction device includes an extraction line and an attachment device, the tank includes a tank top side, the tank top side includes a fastening wall and a first tank top side section, the fastening wall and the first tank top side section delimit a tank interior space at a top side, the tank interior space can be filled with an exhaust-gas aftertreatment liquid, the fastening wall is disposed obliquely with respect to the first tank top side section, the fastening wall has a fastening surface and a tank opening, the attachment device is fastened to the fastening surface, the extraction line is led through the tank opening, the tank includes a tank base having a first tank base section and a second tank base section, the second tank base section is disposed at a lower level than the first tank base section and is connected to the first tank base section, the second tank base section is disposed parallel to the first tank top side section, the first tank base section is disposed obliquely with respect to the second tank base section, and the extraction line is, at least in sections, disposed obliquely with respect to the second tank base section. The invention also relates to a diesel-electric rail vehicle having the tank system.

A diesel-electric locomotive is known, wherein the diesel-electric locomotive comprises a drive unit with a diesel engine and with a generator. The diesel engine drives the generator. To reduce emissions of the diesel engine, an exhaust-gas aftertreatment system is provided. Here, the exhaust-gas aftertreatment system uses an aqueous urea solution to reduce nitrogen oxides in the exhaust gas of the diesel engine. The aqueous urea solution is stored by means of a tank system. The aqueous urea solution is extracted by means of an extraction device and conveyed to the exhaust-gas aftertreatment system. The aqueous urea solution often has contaminants which are deposited in a tank of the tank system. The tank must be regularly cleaned in order to remove the contaminants.

For example, DE 10 2008 011 329 A1 presents a rail vehicle with an exhaust-gas purification arrangement, wherein the urea solution is used for the exhaust-gas purification arrangement.

Furthermore, DE 10 2008 011 329 A1, US 2010/0162690 A1 and US 2007/0202019 A1 present urea tanks with a small storage volume.

EP 2 757 232 A1 has disclosed an off-road vehicle with an exhaust-gas purification tank and with an extraction device, wherein a fastening surface to which the extraction device is fastened is arranged obliquely with respect to a tank top side section of a tank top side of the tank. The extraction device is fastened to the fastening wall.

SUMMARY OF THE INVENTION

It is an object of the invention to provide an improved tank system and an improved vehicle, in particular an improved rail vehicle which is operated on a diesel-electric basis.

Said object is achieved by means of a tank system for a vehicle, wherein the extraction line opens out above the second tank base section of the tank base and is coupled to the attachment device, and the fastening wall is disposed preferably entirely above the first tank base section. The object is also achieved by a diesel-electric rail vehicle including the tank section. Advantageous embodiments are specified in the dependent claims.

It has been identified that an improved tank system can be provided by virtue of the tank system comprising an extraction device and a tank, wherein the extraction device comprises an extraction line and an attachment device, wherein the tank comprises a tank top side, wherein the tank top side comprises a fastening wall and a first tank top side section, wherein the delimiting wall and the first tank top side section delimit a tank interior space at a top side, wherein the tank interior space can be filled with an exhaust-gas aftertreatment liquid, wherein the fastening wall is arranged obliquely with respect to the first tank top side section, wherein the fastening wall has a fastening surface and a tank opening, wherein the attachment device is fastened to the fastening surface, wherein the extraction line is led through the tank opening.

This embodiment has the advantage that the extraction device can be particularly easily removed from the tank for maintenance work. Also, the installation of the extraction device on the tank is particularly straightforward. In particular, uninstallation and installation of the tank and emptying of the tank for the maintenance work can be omitted.

In a further embodiment, the tank comprises a tank base, a first tank base section and a second tank base section, wherein the second tank base section is arranged at a lower level than the first tank base section and is connected to the first tank base section, wherein the second tank base section is arranged parallel to the first tank top side section, wherein the first tank base section is arranged obliquely with respect to the second tank base section, wherein the extraction line opens out above the second tank base section of the tank base and is coupled to the attachment device, wherein the extraction line is, at least in sections, arranged obliquely with respect to the second tank base section.

In a further embodiment, the tank comprises a tank side wall, wherein the fastening wall is arranged so as to be obliquely inclined relative to the tank side wall. Additionally or alternatively, the tank side wall is arranged perpendicular to the first tank top side section.

In a further embodiment, the tank side wall is connected by means of a lower end to a first end of the first tank base section, wherein a second end of the first tank base section is connected to the second tank base section, wherein the second tank base section is arranged below the lower end of the tank side wall and laterally offset with respect to the tank side wall, wherein the fastening wall is arranged above the first tank base section.

In a further embodiment, the fastening wall projects at least in sections beyond the tank side wall, wherein, at least in sections, the tank side wall delimits a storage volume of the tank and the fastening wall delimits an expansion volume for the exhaust-gas aftertreatment liquid. The expansion volume must be provided in order to permit, in the presence of high temperatures of the exhaust-gas aftertreatment liquid, an expansion of the exhaust-gas aftertreatment liquid out of the storage volume into the expansion volume in order to prevent mechanical damage to the tank.

In a further embodiment, a depression is provided on the tank top side between the fastening wall and the tank side wall, wherein the depression has the same longitudinal extent as the fastening wall.

In a further embodiment, the fastening wall, at the top side, projects at least in sections beyond the first tank top side section, wherein, at an upper end, the fastening wall is connected to an upper end of the second tank top side section of the tank top side, wherein a lower end of the second tank top side section is connected to the first tank top side section, wherein the second tank top side section and the fastening wall are adjoined by a front delimiting wall and a rear-side delimiting wall, wherein the front delimiting wall and the rear-side delimiting wall are oriented parallel to one another, wherein the front delimiting wall and the rear-side delimiting wall are arranged perpendicular to the first tank top side section.

In a further embodiment, the extraction device comprises a filter device, wherein the extraction line is designed to conduct the exhaust-gas aftertreatment liquid, wherein the extraction line comprises an extraction section and a first connecting section, wherein the first connecting section is coupled to the attachment device, wherein the extraction section is coupled to the first connecting section, wherein the first connecting section is arranged so as to be obliquely inclined with respect to the extraction section, wherein the extraction section is oriented perpendicular to the first tank top side section, wherein the filter device is connected to the extraction section on a side of the extraction section averted from the first connecting section, wherein the first connecting section is arranged so as to run in a first plane, wherein the extraction section is arranged so as to run in a second plane, wherein the first plane is arranged obliquely with respect to the second plane and encloses a first angle, wherein the first angle has a value, wherein the value preferably lies in a range of less than 90° and greater than 0°, wherein, in particular, the value lies in a range of greater than 0° to 45°, wherein, in particular, the value lies in a range from 15° to 30°. In this way, dirt particles from the tank are prevented from being drawn in through the extraction device.

In a further embodiment, the extraction line comprises a second connecting section, wherein the second connecting section is arranged between the first connecting section and the extraction section and connects the extraction section to the first connecting section, wherein the second connecting section is arranged so as to be obliquely inclined with respect to the extraction section and obliquely inclined with respect to the first connecting section.

In a further embodiment, the tank system has a heat exchanger device with a first heat exchanger element and a second heat exchanger element, wherein the heat exchanger device can be filled with a heat carrier medium, wherein the first heat exchanger element is arranged offset with respect to the second heat exchanger element, wherein each of the heat exchanger elements comprises a first connecting line, a second connecting line and a heating tube, wherein the second connecting line of the first heat exchanger element is connected by means of a third connecting line to the second connecting line of the second heat exchanger element, wherein, between the first heat exchanger element and the second heat exchanger element, the heat exchanger device delimits a protected region, wherein the extraction line is arranged in the protected region. In this way, a particularly reliable extraction from the tank can be ensured. Furthermore, the extraction device is of particularly compact form in the region of the extraction section. Furthermore, damage to the extraction line and/or to the filter device during installation or uninstallation of the extraction device on or from the tank is avoided.

In a further embodiment, the first connecting line is coupled to the attachment device, wherein the first connecting line and the second connecting line are arranged parallel to one another, wherein the first connecting line and the second connecting line are, at least in sections, arranged parallel to the first connecting section of the extraction line, wherein the first connecting line is arranged in a third plane and the first heating tube section is arranged in a fourth plane, wherein the third plane encloses a second angle with the fourth plane, wherein the second angle has a value which lies in a range of greater than 90° and less than 180°, wherein the heating tube comprises at least one first heating tube section, wherein the first heating tube section is connected to the first connecting line, wherein the first heating tube section is arranged perpendicular to the extraction section. In this way, the extraction device can be of particularly compact form.

In a further embodiment, the heating tube comprises a second heating tube section and a heating tube connecting section, wherein the second connecting line is connected to the heating tube, wherein the second connecting line is, at least in sections, arranged parallel to the first connecting line, wherein the heating tube connecting section fluidically connects the first heating tube section to the second heating tube section and is arranged on a side of the first heating tube section which is averted from the first connecting line.

In a further embodiment, the filter device is arranged between the heating tube of the first heat exchanger element and the heating tube of the second heat exchanger element, wherein the filter device is preferably formed as an areal filter, wherein, preferably, multiple filter devices are provided, which are arranged in a row parallel to the heating tube.

In a further embodiment, a vehicle comprises a tank system, a longitudinal member and a vehicle side delimitation, wherein the tank system is designed as described above, wherein the tank is arranged under the longitudinal member, wherein the vehicle side delimitation and the longitudinal member are arranged offset transversely with respect to a direction of travel of the vehicle, wherein, transversely with respect to the direction of travel, the vehicle side delimitation and the longitudinal member delimit the extraction device for the installation and/or uninstallation, wherein, in a downward direction, the installation space is delimited by the tank top side of the tank, wherein the tank system comprises at least one pump device and one attachment line, wherein the pump device has a suction side and a pressure side, wherein the suction side is fluidically connected via the attachment line to the extraction device, wherein the pressure side is fluidically connectable to an exhaust-gas aftertreatment system of the vehicle, wherein the pump device and the attachment line are arranged in the installation space.

In a further embodiment, the attachment device is arranged so as to be obliquely inclined toward the vehicle side delimitation. In this way, particularly easy accessibility to the attachment device and for facilitated installation and uninstallation of a fastening means arranged on the attachment device is ensured. Alternatively or in addition, the tank extends at least over 80 percent of a total vehicle width of the vehicle. In this way, the storage volume of the tank can amount to between 750 l and 6000 l.

