Patent ID: 9726072
Date: 2017-08-08
CPC Classifications: F02B,F02D,Y02T

Claim:
1. A motor vehicle comprising: an engine; a supply air tract; a throttle flap arranged in the supply air tract; an exhaust tract which comprises a first exhaust line and a second exhaust line; a first turbocharger including a first exhaust-gas turbine and a first compressor connected in torque-transmitting fashion to the first exhaust-gas turbine; a second turbocharger which has a second exhaust-gas turbine and a second compressor connected in torque-transmitting fashion to the second exhaust-gas turbine, the first turbocharger operated on its own, or, at high loads, together with the second turbocharger; where the first exhaust-gas turbine is arranged in the first exhaust line and the second exhaust-gas turbine is arranged in the second exhaust line, and the compressors are arranged in the supply air tract, and where the exhaust-gas turbines and thus the compressors are configured to be driven by exhaust gas that is generated during operation of the engine to generate a charge pressure in the supply air tract; a bypass configured to conduct the exhaust gas past only the first exhaust-gas turbine; a bypass valve equipped in the bypass, such that at least a part of the exhaust gas is conducted through the bypass in a first configuration of the valve and block said bypass in a second configuration of the valve; and a charge-pressure control device, including a bypass control line pneumatically coupled to the first exhaust line, and an actuator connected to the bypass control line and configured to adjust the bypass valve, the charge-pressure control device configured to charge the bypass control line with a certain opening pressure when a predefined charge pressure prevails downstream of the throttle flap, the actuator configured to open the bypass valve, thereby opening up the bypass, when the opening pressure prevails; and a pneumatically actuated adaptation unit coupled to the bypass control line and configured to pneumatically reduce a pressure in the bypass control line, independent of the charge-pressure control device, responsive to a pressure change in the first or second exhaust line, to a closing pressure which is lower than the opening pressure, the actuator configured to close the bypass valve, thereby blocking the bypass, when the bypass control line is charged with closing pressure.