Drive train of a vehicle

A drive train of a vehicle, comprising:

• an internal combustion engine;
• a traction drive driven by the internal combustion engine;
• working hydraulics driven by the internal combustion engine, wherein the working hydraulics include at least one hydraulic pump driven by the internal combustion engine, which at least one hydraulic pump is operable as a pump and as a motor, wherein the hydraulic pump, when operated as a pump, sucks hydraulic fluid from a tank on a suction side of the hydraulic pump and delivers into a delivery line that leads to the working hydraulics, and wherein the hydraulic pump, when operated as a motor, forms a hydraulic starter of a start-stop function to start the internal combustion engine and is supplied with hydraulic fluid from a hydraulic accumulator on the suction side;
• a connecting line that leads to the hydraulic accumulator is connected to the delivery line of the hydraulic pump that leads to the working hydraulics;
• a shutoff valve located in the connecting line, wherein the shutoff valve opens automatically and as a function of pressure to allow a flow to the hydraulic accumulator;
• and
• a pressure relief valve operatively associated with the connecting line between the shutoff valve and the hydraulic accumulator.