Apparatus and control method for avoiding shock in diesel filters

Abstract

Provided are systems and/or methods that facilitate regeneration of a soot filter for a diesel engine. The systems and/or methods can include a bypass tube that connects a compressor side of a turbocharger to an exhaust side of the turbocharger. Compressed air from the turbocharger is introduced through the bypass tube into the soot filter and reduced a soot filter temperature, thereby mitigating the risk of thermal shock and over temperature conditions in the soot filter.

1 . A system that facilitates regeneration of a soot filter for a diesel engine, comprising:
 a turbocharger that is coupled to the diesel engine and the soot filter;   a motor that is coupled to a turbocharger shaft;   a bypass tube that connects a compressor side of the turbocharger to an exhaust side of the turbocharger; and   a bypass valve and a controller that control an amount of compressed air that flows through the bypass tube.   
   
   
       2 . The system of  claim 1 , wherein the motor drives the turbocharger independently of the diesel engine. 
   
   
       3 . The system of  claim 1 , wherein the bypass tube comprises a burner therein to increase a compressed air temperature. 
   
   
       4 . The system of  claim 1  further comprising a fuel injector that provides fuel vapors in an exhaust gas of the diesel engine. 
   
   
       5 . The system of  claim 4 , wherein the controller controls the amount of compressed air by operating the motor, the bypass valve, or combinations thereof. 
   
   
       6 . The system of  claim 1 , wherein the soot filter is a ceramic soot filter. 
   
   
       7 . The system of  claim 1 , wherein the bypass tube connects the compressor side to an exhaust conduit upstream of the exhaust side of the turbocharger, to an exhaust pipe downstream of the turbocharger, or a combination thereof. 
   
   
       8 . The system of  claim 1  further comprising a soot filter temperature sensor, a turbo outlet temperature sensor, an engine speed sensor, or combinations thereof. 
   
   
       9 . A method that facilitates mitigating thermal shock in a soot filter for a diesel engine, comprising:
 introducing compressed air from a turbocharger into the soot filter by a bypass tube that bypasses the compressed air around the diesel engine, the bypass tube comprising a bypass valve; and   controlling an amount of the compressed air introduced into the soot filter to prevent a soot filter temperature from exceeding a first pre-determined temperature.   
   
   
       10 . The method of  claim 9 , wherein the compressed air is introduced by the bypass tube that connects the compressor side to an exhaust conduit upstream of the exhaust side of the turbocharger, to an exhaust pipe downstream of the turbocharger, or a combination thereof. 
   
   
       11 . The method of  claim 9 , wherein the amount of the compressed air introduced into the soot filter is controlled based on a turbo speed, turbo outlet temperature, turbo outlet pressure, engine speed, soot filter temperature, soot filter back pressure, or combinations thereof. 
   
   
       12 . The method of  claim 9 , wherein the amount of the compressed air introduced into the soot filter is controlled by operating the bypass valve in the bypass tube, a motor that drives the turbocharger, or combinations thereof. 
   
   
       13 . The method of  claim 9  further comprising increasing a temperature of an exhaust gas that flows into the soot filter by operating a motor that drives the turbocharger, a fuel injector that injects fuel into the exhaust gas, a burner in the bypass tube, or combinations thereof. 
   
   
       14 . The method of  claim 1 , wherein the amount of the compressed air introduced into the soot filter is controlled when the diesel engine is in an idle mode or a low-demand mode, or when the diesel engine stops. 
   
   
       15 . A method that facilitates mitigating thermal shock in a soot filter for a diesel engine, comprising:
 introducing compressed air from a turbocharger into the soot filter by a bypass tube that is around the diesel engine and that comprises a bypass valve; and   reducing a soot filter temperature by controlling an amount of the compressed air introduced into the soot filter.   
   
   
       16 . The method of  claim 15 , wherein the compressed air is introduced by the bypass tube that connects the compressor side to an exhaust conduit upstream of the exhaust side of the turbocharger, to an exhaust pipe downstream of the turbocharger, or a combination thereof. 
   
   
       17 . The method of  claim 15 , wherein the amount of the compressed air introduced into the soot filter is controlled based on a turbo speed, turbo outlet temperature, turbo outlet pressure, engine speed, soot filter temperature, soot filter back pressure, or combinations thereof. 
   
   
       18 . The method of  claim 15 , wherein the amount of the compressed air introduced into the soot filter is controlled by operating the bypass valve in the bypass tube, a motor that drives the turbocharger or combinations thereof. 
   
   
       19 . The method of  claim 15  further comprising increasing a temperature of an exhaust gas that flows into the soot filter by operating a motor that drives the turbocharger, a fuel injector that injects fuel into the exhaust gas, a burner in the bypass tube, or combinations thereof. 
   
   
       20 . The method of  claim 15 , wherein the amount of the compressed air introduced into the soot filter is controlled when the diesel engine is in an idle mode or a low-demand mode, or when the diesel engine stops.