# US 7,607,292 B2 · Fuel addition apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,607,292 B2 - Document ID: US7607292B2 - Status: Granted - Kind: B2 - Application number: 11/794,912 - Filed: 2006-09-07 - Published: 2008-01-31 - Granted: 2009-10-27 - Earliest claimed: 2005-09-09 - Assignees: Toyota Jidosha Kabushiki Kaisha - Inventors: Masaaki Kobayashi - Web page: https://patentgrep.com/patent/US7607292B2 ## CPC - F01N 3/0821: {combined with particulate filter} - F01N 3/0253: {adding fuel to exhaust gases} - F01N 3/0814: {combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts} - F01N 3/0842: {Nitrogen oxides} - F01N 3/0871: {using means for controlling, e.g. purging, the absorbents or adsorbents} - F01N 3/36: Arrangements for supply of additional fuel - F01N 9/002: {of filter regeneration} - F01N 2560/06: the means being a temperature sensor - F01N 2610/1493: Purging the reducing agent out of the conduits or nozzle - F01N 2900/08: said parameters being related to the engine - F01N 2900/1811: Temperature - Y02T 10/40: Engine management systems - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract In a transient state, where the temperature at the distal end of a fuel adding valve enters a high temperature region, an addition amount for preventing clogging is not simply added in accordance with a map, but instead, delay in the rise of the temperature of the fuel adding valve in the transient state is taken into consideration, and the addition amount for preventing clogging is calculated on the basis of the elapsed time after the point in time when the temperature at the distal end of the fuel adding valve enters the distal end high temperature region and the drive state of the engine (for example, the number of rotations of the engine), and thus, addition is carried out (steps ST4 to ST6). Such addition control makes it possible to add an appropriate fuel addition amount for the rise in temperature of the fuel adding valve in the transient state, and thus, wasteful fuel addition is reduced. ## Claims ### Claim 1 A fuel addition apparatus for adding fuel into an exhaust passage of an internal combustion engine, the fuel addition apparatus comprising: a fuel adding valve for adding fuel into the exhaust passage of the internal combustion engine having a nozzle and nozzle hole exposed to the interior of the exhaust passage; a crank position sensor for determining whether the fuel adding valve itself has entered a high temperature region on the basis of number of rotations of the engine and the amount of fuel injected into the engine; an addition amount calculating section which calculates a fuel addition amount on the basis of the elapsed time after the point in time when the temperature of said fuel adding valve itself enters the high temperature region and based on the number of rotations of the engine; and an addition controlling section which controls addition of fuel on the basis of said calculated fuel addition amount and said elapsed time to prevent wasteful fuel addition, wherein clogging of the nozzle hole due to calking of substances such as soot and SOF deposited thereon, or adhered thereto, is limited or prevented. ### Claim 2 (depends on 1) The fuel addition apparatus according to claim 1, said addition amount calculating section calculates the fuel addition amount by multiplying the basic fuel addition amount, which is calculated from a map that has been set in advance, by a correction coefficient corresponding to said elapsed time and the operational state of said internal combustion engine. ### Claim 3 (depends on 2) The fuel addition apparatus according to claim 2, wherein said addition amount calculating section corrects the addition amount by multiplying one of a basic addition interval which is calculated from a map that has been set in advance and the basic addition period by said correction coefficient. ### Claim 4 (depends on 1) The fuel addition apparatus according to claim 1, wherein, as the operational state of said internal combustion engine, the temperature of the exhaust is used for the calculation of said fuel addition amount. ### Claim 5 (depends on 1) The fuel addition apparatus according to claim 1, wherein, as the drive state of said internal combustion engine, the intake air amount is used for the calculation of said fuel addition amount. ### Claim 6 A fuel addition apparatus for adding fuel into an exhaust passage of an internal combustion engine, the fuel addition apparatus comprising: a fuel adding valve for adding fuel into the exhaust passage of the internal combustion engine having a nozzle and nozzle hole exposed to the interior of the exhaust passage; a crank position sensor for determining whether the fuel adding valve itself has entered a high temperature region on the basis of number of rotations of the engine and the amount of fuel injected into the engine; an addition controlling section which starts addition control after a predetermined period of time has elapsed from the point in time when the temperature of said fuel adding valve itself enters the high temperature region and based on the number of rotations of the engine; and a delay time, which is a period to when the addition control is started from the point in time when the temperature of said fuel adding valve enters a particular region that has been set in advance, is set in accordance with the temperature of said fuel adding valve to prevent wasteful fuel addition, wherein clogging of the nozzle hole due to calking of substances such as soot and SOF deposited thereon, or adhered thereto, is limited or prevented.