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AssigneesAVL List GmbH, Fpt Industrial S.P.A., Iveco S.P.A.
InventorsMichael Glensvig, Markus Thaler, Susanne Mahler
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A method for detecting a leaking point in a heat recovery system of an internal combustion engine of a motor vehicle, wherein the heat recovery system includes a combustible working medium and a working medium circuit with an evaporator, a pump and an expansion machine. The recirculated exhaust gas of the engine flows through or around the evaporator which is arranged in an exhaust-gas return line. At least one oxidation catalytic converter is arranged in an exhaust gas line of the engine. A first temperature sensor is arranged in the exhaust gas line upstream and a second exhaust gas temperature sensor is arranged downstream of the oxidation catalytic converter. Temperatures of the exhaust gas are measured with these temperature sensors during operation of the engine in the exhaust gas line upstream and downstream of the oxidation catalytic converter. A temperature difference of the exhaust gas upstream and downstream of the oxidation catalyst is determined, wherein upon occurrence of an abnormally high temperature difference a conclusion is drawn on a leak in the evaporator.
A method for detecting a leaking point in a heat recovery system of an Internal combustion engine of a motor vehicle, wherein the heat recovery system comprises at least one combustible working medium and a working medium circuit with at least one exhaust gas recirculation (EGR) evaporator, a pump and at least one expansion machine, wherein the recirculated exhaust gas of the Internal combustion engine flows through or around the EGR evaporator which Is arranged in an exhaust-gas return line, and wherein at least one oxidation catalytic converter is arranged in an exhaust gas line of the Internal combustion engine, wherein a first temperature sensor is arranged in the exhaust gas line upstream of the oxidation catalytic converter and a second exhaust gas temperature sensor is arranged downstream of the oxidation catalytic converter, and temperatures of the exhaust gas are measured with the first and second temperature sensors during operation of the Internal combustion engine in the exhaust gas line upstream and downstream of the oxidation catalytic converter, and a temperature difference of the exhaust gas upstream and downstream of the oxidation catalyst is determined, wherein upon occurrence of at least an abnormally high temperature difference a conclusion is drawn on a leak in the EGR evaporator.
An Internal combustion engine, comprising a heat recovery system which has at least one particularly combustible working medium and a working medium circuit with at least one exhaust gas recirculation (EGR) evaporator, a pump and at least one expansion machine, wherein the EGR evaporator is arranged in an exhaust gas recirculation line of the Internal combustion engine, and wherein at least one oxidation catalytic converter is arranged in at least one exhaust gas line of the Internal combustion engine, wherein a first temperature sensor is arranged upstream of the oxidation catalytic converter and a second temperature sensor is arranged downstream of the oxidation catalytic converter, and with said first and second temperature sensors, the temperature of the exhaust gas in the exhaust gas line of the internal combustion engine can be measured upstream and downstream of the oxidation catalytic converter, wherein said first and second temperature sensors are connected to at least one of an electronic control and evaluation unit.
Dependencies are inferred from the claim text.