Avl List Gmbh

Iveco S.p.a.

Fpt Industrial S.p.a.

Mahle Amovis Gmbh

Gerald Gradwohl

Klemens Neunteufl

Fabio Cococcetta

Michael Bucher

Michael Glensvig

Josef Speiser

Thomas Eckhardt

Ivan Calaon

Helmut Altendorfer

Oswald Lackner

The invention relates to a method for controlling a waste-heat utilization system () for an internal combustion engine () of a vehicle, wherein the waste-heat utilization system () has at least one expander (), which can transmit torque to the internal combustion engine () and which can be bypassed by means of a bypass flow path (), at least one evaporator (), and at least one pump () for an operating medium, and wherein at least the evaporator () is arranged in the region of the exhaust gas system () of the internal combustion engine (). The expander (), which can be operated in several operating modes, has a driving connection to a secondary drive shaft () of the internal combustion engine in at least one operating mode. An operating mode of the waste-heat utilization system () is selected by a control device () on the basis of at least one input variable and the waste-heat utilization system () is operated in said operating mode. The input variable is selected by the control device () from the group consisting of expander rotational speed (n), gear information (GI), coasting information (CI), and pressure (p, p) and temperature (T, T) of the operating medium upstream or downstream of the expander (). A first operating mode () is associated with a warm-up phase of the expander () and a second operating mode () is associated with a normal operating phase of the expander (). In the first operating mode, the bypass flow path () is opened and the expander () is not connected to a secondary drive shaft () of the internal combustion engine (). In the second operating mode, the bypass flow path () is closed and the expander () is connected to the internal combustion engine (). The second operating mode () is selected if the pressure (p) and/or the temperature (T) of the operating medium downstream of the expander () exceeds a defined value.

Method for controlling a waste heat utilization system for an internal combustion engine

The invention relates to a method for detecting an unsealed location in a heat recovery system () of an internal combustion engine () of a motor vehicle. The heat recovery system () has at least one combustible working medium, a working medium circuit () with at least one EGR evaporator (), a pump (), and at least one expansion machine (). The aim of the invention is to allow an early and reliable detection of leakages in the EGR evaporator () of a heat recovery system () in the simplest manner possible. This is achieved in that the internal combustion engine () 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 () is detected.

Method for detecting an unsealed location in a heat recovery system of an internal combustion engine

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Graz, Austria

Gerald Gradwohl