Abstract: The invention relates to a method for controlling a waste-heat utilization system (20) for an internal combustion engine (10) of a vehicle, wherein the waste-heat utilization system (20) has at least one expander (22), which can transmit torque to the internal combustion engine (10) and which can be bypassed by means of a bypass flow path (25), at least one evaporator (21), and at least one pump (24) for an operating medium, and wherein at least the evaporator (21) is arranged in the region of the exhaust gas system (11) of the internal combustion engine (10). The expander (22), which can be operated in several operating modes, has a driving connection to a secondary drive shaft (19) of the internal combustion engine in at least one operating mode. An operating mode of the waste-heat utilization system (20) is selected by a control device (30) on the basis of at least one input variable and the waste-heat utilization system (20) is operated in said operating mode.

Abstract: The invention relates to a method for detecting an unsealed location in a heat recovery system (5) of an internal combustion engine (1) of a motor vehicle. The heat recovery system (5) has at least one combustible working medium, a working medium circuit (6) with at least one EGR evaporator (7), a pump (8), and at least one expansion machine (9). The aim of the invention is to allow an early and reliable detection of leakages in the EGR evaporator (7) of a heat recovery system (5) in the simplest manner possible. This is achieved in that the internal combustion engine (1) is operated in the overrun mode, the oxygen concentration in the exhaust gas is ascertained and compared with a defined lower threshold, and if the lower threshold is undershot, a leakage in the EGR evaporator (7) is detected.

Abstract: The invention relates to a method for controlling a waste-heat utilization system (20) for an internal combustion engine (10) of a vehicle, wherein the waste-heat utilization system (20) has at least one expander (22), which can transmit torque to the internal combustion engine (10) and which can be bypassed by means of a bypass flow path (25), at least one evaporator (21), and at least one pump (24) for an operating medium, and wherein at least the evaporator (21) is arranged in the region of the exhaust gas system (11) of the internal combustion engine (10). The expander (22), which can be operated in several operating modes, has a driving connection to a secondary drive shaft (19) of the internal combustion engine in at least one operating mode. An operating mode of the waste-heat utilization system (20) is selected by a control device (30) on the basis of at least one input variable and the waste-heat utilization system (20) is operated in said operating mode.

Abstract: The invention relates to a method for detecting an unsealed location in a heat recovery system (5) of an internal combustion engine (1) of a motor vehicle. The heat recovery system (5) has at least one combustible working medium, a working medium circuit (6) with at least one EGR evaporator (7), a pump (8), and at least one expansion machine (9). The aim of the invention is to allow an early and reliable detection of leakages in the EGR evaporator (7) of a heat recovery system (5) in the simplest manner possible. This is achieved in that the internal combustion engine (1) is operated in the overrun mode, the oxygen concentration in the exhaust gas is ascertained and compared with a defined lower threshold, and if the lower threshold is undershot, a leakage in the EGR evaporator (7) is detected.

Abstract: The invention relates to a method for controlling a waste-heat utilization system (20) for a motor vehicle driven by an internal combustion engine (10) by means of a drive train (13), wherein the waste-heat utilization system (20) has at least one expander (22), at least one evaporator (21), and at least one pump (24) for an operating medium, in particular ethanol. At least the evaporator (21) is arranged in the region of the exhaust gas system (11) of the internal combustion engine (10). The expander (22), which can be operated in several operating modes, performs work in at least one operating mode.

Abstract: A method for controlling a heat recovery device in an internal combustion engine, in particular, for a motor vehicle. The heat recovery device is provided with a circuit for a working medium having an evaporator of an expansion machine that is arranged in an exhaust gas flow path of the internal combustion engine, a condensor, an expansion tank, and a feed pump. The working temperature of the working medium is controlled by varying the mass flow of the working fluid as a function of at least one operating parameter. A setpoint value of the working medium mass flow of an exhaust gas flow path of an exhaust gas tract and/or an exhaust gas recirculation line is calculated on the basis of a base setpoint value for the working medium mass flow. The base setpoint value for the working medium mass flow is at least a function of the exhaust gas temperature, preferably upstream of the evaporator, and of the exhaust gas mass flow in the exhaust gas flow path.

Abstract: A method for controlling a heat recovery device in an internal combustion engine, in particular, for a motor vehicle. The heat recovery device is provided with a circuit for a working medium having an evaporator of an expansion machine that is arranged in an exhaust gas flow path of the internal combustion engine, a condensor, an expansion tank, and a feed pump. The working temperature of the working medium is controlled by varying the mass flow of the working fluid as a function of at least one operating parameter. A setpoint value of the working medium mass flow of an exhaust gas flow path of an exhaust gas tract and/or an exhaust gas recirculation line is calculated on the basis of a base setpoint value for the working medium mass flow. The base setpoint value for the working medium mass flow is at least a function of the exhaust gas temperature, preferably upstream of the evaporator, and of the exhaust gas mass flow in the exhaust gas flow path.

Abstract: A method for the closed-loop control of the combustion position in an internal combustion engine with several cylinders, especially in a diesel engine, with at least one engine operating parameter being detected, wherein a cylinder-selective combustion position model which is arithmetic or based on characteristic values is provided which produces a relationship between at least one determined engine operating parameter and the combustion position, and the combustion position is determined on the basis of the determined engine operating parameter by the combustion position model for each cylinder.

Abstract: A method for closed loop controlling the air system in an internal combustion engine, in particular a diesel internal combustion engine with a first actuating element for recirculated exhaust gas in the exhaust gas recirculation tract and a second actuating element for air in the inlet tract, the two actuating elements being adjusted as a function of each other. In order to increase the quality of closed loop control, provision is made for each actuating element to be controlled separately by its own respective controller, each controller being optimally configured for the respective controlled system, and a target value being provided for each controller.

Abstract: The invention relates to a method for closed loop controlling the air system in an internal combustion engine, in particular a diesel internal combustion engine with a first actuating element for recirculated exhaust gas in the exhaust gas recirculation tract and a second actuating element for air in the inlet tract, the two actuating elements being adjusted as a function of each other. In order to increase the quality of closed loop control, provision is made for each actuating element to be controlled separately by its own respective controller, each controller being optimally configured for the respective controlled system, and a target value being provided for each controller.

Abstract: In a method for closed loop controlling the air system in an internal combustion engine, in particular a diesel internal combustion engine with a first actuating element for recirculated exhaust gas in the exhaust gas recirculation tract and a second actuating element for air in the inlet tract, the two actuating elements being adjusted as a function of each other. In order to increase the quality of closed loop control, provision is made for each actuating element to be controlled separately by its own respective controller, each controller being optimally configured for the respective controlled system, and a target value being provided for each controller.

Abstract: In a method for closed loop controlling the air system in an internal combustion engine, in particular a diesel internal combustion engine with a first actuating element for recirculated exhaust gas in the exhaust gas recirculation tract and a second actuating element for air in the inlet tract, the two actuating elements being adjusted as a function of each other. In order to increase the quality of closed loop control, provision is made for each actuating element to be controlled separately by its own respective controller, each controller being optimally configured for the respective controlled system, and a target value being provided for each controller.

Abstract: A method for the closed-loop control of the combustion position in an internal combustion engine with several cylinders, especially in a diesel engine, with at least one engine operating parameter being detected, wherein a cylinder-selective combustion position model which is arithmetic or based on characteristic values is provided which produces a relationship between at least one determined engine operating parameter and the combustion position, and the combustion position is determined on the basis of the determined engine operating parameter by the combustion position model for each cylinder.

Abstract: The invention relates to a direct-injection internal combustion engine that is operated in a first operating range associated with the low part load, with largely homogeneous combustion of the mixture and subsequent injection. Said internal combustion engine is operated in a second operating range associated with the middle part load, with low-temperature combustion of the mixture. In this way, minimum nitrogen oxide and soot emissions and a high degree of efficiency can be achieved both in the lower part load region and up to the full load region.

Abstract: According to the invention, noise of an internal combustion engine is reduced by dynamically correcting the moment of injection when the engine is in the transient mode.

Abstract: According to the invention, noise of an internal combustion engine is reduced by dynamically correcting the moment of injection when the engine is in the transient mode.

Abstract: According to the invention, noise of an internal combustion engine is reduced by dynamically correcting the moment of injection when the engine is in the transient mode.