Volkswagen Ag

Markus Stolz

Rainer Fleischer

Hendrik Gerth

Jens Uwe Müller

Lan Dang Hung

Oliver Wintzheimer

A method for operating a transportation vehicle having a high-voltage on-board electrical system and a low-voltage on-board electrical system connected by a DC-to-DC converter. The high-voltage on-board electrical system is connected by a switching unit to a battery unit having two subregions able to be connected electrically in series and electrically in parallel by an interconnection unit. In the method, the switching unit is opened, and the subregions are connected electrically in parallel by the interconnection unit. Electrical energy is channeled from the high-voltage on-board electrical system to the low-voltage on-board electrical system by the DC-to-DC converter reducing the voltage of the high-voltage on-board electrical system. In response to the voltage of the high-voltage on-board electrical system differing from the voltage present at the battery unit by no more than a tolerance value, the switching unit is closed. Also disclosed is a transportation vehicle and a computer program product.

Method for operating a transportation vehicle

An electrical on-board power system for an electrically driven transportation vehicle having a traction battery with a first battery terminal and a second battery terminal, a first current path between the first battery terminal and a first terminal, and a second current path between the second battery terminal and a second terminal. An electrical or electromagnetic first switch is connected in the first current path and an electrical or electromagnetic second switch is connected in the second current path. The on-board power system has a DC-to-DC voltage converter connected at output to a low-voltage system, wherein a first input of the DC-to-DC voltage converter is connected to a first tap in the first current path and the first switch, and a second input of the DC-to-DC voltage converter is connected to a second tap between the second switch and the second load terminal.

On-board electrical system and method for operating an on-board network

An electrical system comprises at least one high-voltage battery, at least one DC link capacitor and at least two power relays, whereby one power relay is arranged between a positive connector of the high-voltage battery and the DC link capacitor, while the other power relay is arranged between a negative connector of the high-voltage battery and the DC link capacitor, whereby the electrical system has a galvanically isolated DC/DC converter that is connected to a voltage source in the electrical system, whereby the DC/DC converter is configured such that it can transmit electric energy to a high-voltage side with the DC link capacitor in order to pre-charge the DC link capacitor, whereby the electrical system has a diagnostic device to test the power relays, whereby the diagnostic device has switchable voltage sensors.

Growing community of inventors

Rühen, Germany

Markus Stolz