Engine system

Abstract

An engine system is provided that uses lubrication oil that forms water-soluble ash when combusted. The engine system comprises an internal combustion engine lubricated by the lubrication oil; an exhaust gas system for cleaning exhaust gases from the internal combustion engine, the exhaust gas system comprising a diesel particulate filter to capture particulate matter from the exhaust gases, wherein the particulate matter comprises the water-soluble ash; an exhaust gas conduit to lead exhaust gases from the internal combustion engine to the exhaust gas system; and condensation means to accumulate condensed water and/or to form an increased amount of condensed water and arranged in fluid connection with the exhaust gas flow upstream of the diesel particulate filter. The exhaust gas conduit is arranged to collect condensed water and lead the condensed water through the diesel particulate filter, thereby dissolving and thus removing the water-soluble ash from the diesel particulate filter.

1 . An engine system comprising:
 an internal combustion engine arranged to be operated by a fuel and to be lubricated by a lubrication oil that forms water-soluble ash when combusted;   an exhaust gas system for cleaning an exhaust gas flow from the internal combustion engine, the exhaust gas system comprising a diesel particulate filter arranged to capture particulate matter from the exhaust gases, wherein the particulate matter comprises the water-soluble ash;   an exhaust gas conduit arranged to lead exhaust gases from the internal combustion engine through the exhaust gas system; and   condensation means arranged to accumulate condensed water and/or to form an increased amount of condensed water and arranged in fluid connection with the exhaust gas flow upstream of the diesel particulate filter,   wherein the exhaust conduit is arranged to collect the condensed water and lead the condensed water through the diesel particulate filter, thereby dissolving and thus removing the water-soluble ash from the diesel particulate filter.   
     
     
         2 . An engine system according to  claim 1 , wherein the condensation means comprises an accumulation device arranged to accumulate the condensed water. 
     
     
         3 . An engine system according to  claim 2 , wherein the accumulation device comprises a metallic net. 
     
     
         4 . An engine system according to  claim 1 , wherein the condensation means comprises a cooling device arranged to be in contact with the exhaust gas flow and thereby increase the amount of condensed water. 
     
     
         5 . An engine system according to  claim 4 , wherein the cooling device comprises a metallic cooling element fluidly connected to a cooling flange, which is in contact with the surrounding atmosphere and arranged to cool the cooling element. 
     
     
         6 . An engine system according to  claim 5 , wherein the metallic cooling element is formed as a metallic net. 
     
     
         7 . An engine system according to  claim 5 , wherein the metallic cooling element is arranged to be movable from a first inactive position to a second active position. 
     
     
         8 . An engine system according to  claim 7 , wherein the engine system further comprises a control system arranged to control the operation of the cooling device and move the cooling element from the first inactive position to the second active position, and vice versa. 
     
     
         9 . An engine system according to  claim 4 , wherein cooling device comprises a heat exchanger arranged to be activated and/or inactivated. 
     
     
         10 . An engine system according to  claim 9 , wherein the engine system further comprises a control system arranged to control the operation of the cooling device comprising the heat exchanger and activate or inactivate the operation of the heat exchanger. 
     
     
         11 . An engine system according to  claim 8 , wherein the control system is arranged to control the operation of the cooling device at pre-determined intervals and/or pre-determined conditions. 
     
     
         12 . An engine system according to  claim 11 , wherein the exhaust gas system further comprises a first sensor arranged upstream of the diesel particulate filter for measuring a pressure drop over the diesel particulate filter or the pressure of the exhaust gas flow before filtration, and the first sensor is connected to the control system. 
     
     
         13 . An engine system according to  claim 12 , wherein the control system comprises means arranged to compare the measured pressure drop value or the value for the pressure of the exhaust gas flow with a predetermined value for the pressure drop or the pressure of the exhaust gas flow and create an error code, if the pressure drop value or the pressure value differs from the predetermined value. 
     
     
         14 . An engine system according to  claim 12 , wherein
 the exhaust gas system further comprises a second sensor arranged downstream of the diesel particulate filter for measuring the pressure of the exhaust gas flow after filtration, and wherein the second sensor is connected to the control system and the control system comprises means arranged to calculate a pressure drop over the diesel particulate filter from the received measuring signal from the first sensor and the second sensor; and   wherein the control system comprises means arranged to compare the calculated pressure drop value with a predetermined pressure drop value and create an error code if the measured pressure drop value differs from the predetermined value.   
     
     
         15 . An engine system according to  claim 13 , wherein the control system comprises means arranged to control the internal combustion engine based on the measured or calculated pressure drop value or value for the pressure of the exhaust gas flow, so as to increase the amount of condensed water. 
     
     
         16 . A vehicle comprising an engine system, which comprises:
 an internal combustion engine arranged to be operated by a fuel and to be lubricated by a lubrication oil that forms water-soluble ash when combusted;   an exhaust gas system for cleaning an exhaust gas flow from the internal combustion engine, the exhaust gas system comprising a diesel particulate filter arranged to capture particulate matter from the exhaust gases, wherein the particulate matter comprises the water-soluble ash;   an exhaust gas conduit arranged to lead exhaust gases from the internal combustion engine through the exhaust gas system; and   condensation means arranged to accumulate condensed water and/or to form an increased amount of condensed water and arranged in fluid connection with the exhaust gas flow upstream of the diesel particulate filter,   wherein the exhaust conduit is arranged to collect the condensed water and lead the condensed water through the diesel particulate filter, thereby dissolving and thus removing the water-soluble ash from the diesel particulate filter.   
     
     
         17 . A vehicle according to  claim 16 , wherein the condensation means comprises an accumulation device arranged to accumulate the condensed water. 
     
     
         18 . A vehicle according to  claim 17 , wherein the accumulation device comprises a metallic net. 
     
     
         19 . A vehicle according to  claim 16 , wherein the condensation means comprises a cooling device arranged to be in contact with the exhaust gas flow and thereby increase the amount of condensed water. 
     
     
         20 . A vehicle according to  claim 19 , wherein the cooling device comprises a metallic cooling element fluidly connected to a cooling flange, which is in contact with the surrounding atmosphere and arranged to cool the cooling element.