公开(公告)号：JPH10121952A

公开(公告)日：1998-05-12

申请号：JP28233596

申请日：1996-10-24

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: F02D9/02 ,  F01N3/10 ,  F01N3/22 ,  F01N3/24 ,  F01N3/28 ,  F02D45/00

Abstract: PROBLEM TO BE SOLVED: To effectively reduce NOx, HC and CO in exhaust gas by controlling the intake volume of a diesel engine so as to maintain the temperature of exhaust gas from the diesel engine at a temperature higher than a predetermined value which is required for purifying exhaust gas by a catalyst device. SOLUTION: An exhaust emission control device comprises an intake-air throttle means 27 for controlling the volume of intake-air in a diesel engine, an NOx reducing catalyst device 35 located in and exhaust gas passage, and oxide catalyst device 36, a secondary air supply means 48 for supplying secondary air into exhaust gas in the vicinity of the inlet port of the oxide catalyst device 36, and a computer which can deliver an intake-air volume control signal A1 for controlling the intake-air volume, and secondary air volume control signal A2 for controlling the secondary air volume, to the intake-air throttle means 27 and the secondary air supply means 48, respectively. The computer computes and delivers the signals A1 , A2 , in accordance with an engine speed signal S1 , an engine load signal S2 , an exhaust temperature signal S3 transmitted from a temperature sensor 34 provided in the inlet port of the NOx reducing catalyst device, and an exhaust gas oxygen density signal S4 transmitted from an oxygen sensor 50 provided in the inlet port of the NOx reducing catalyst device 37.

公开(公告)号：JPH10354A

公开(公告)日：1998-01-06

申请号：JP15669396

申请日：1996-06-18

Applicant: HINO MOTORS LTD

Inventor： SHIMODA MASATOSHI ,  HOSOYA MITSURU

IPC: B01D53/86 ,  B01D53/94 ,  B01J23/40 ,  B01J23/42 ,  B01J27/22 ,  B01J27/224 ,  B01J27/24 ,  B01J37/00 ,  B01J37/02

Abstract: PROBLEM TO BE SOLVED: To provide a catalyst having a wide active temp. range for the reduction of NOx . SOLUTION: The catalyst is composed by deposing platinum group elements on a porous carrier composed of a ceramic material having higher thermal stability than alumina and having open voids. Preferably, the open voids rate is 1 to 40vol.%, and the ceramic material is one ore more kinds selected from zirconium oxide, zirconium carbide, silicon carbide, silicon nitride and titanium carbide. The catalyst is produced by adding carbon, an inorg. binder and water to a granular ceramic material, kneading the mixture, molding, drying and firing to volatilizing the carbon content to obtain a porous carrier, and then depositing platinum group elements. Otherwise, the platinum elements may be prepared in a slurry state and applied on the carrier. It is preferable to add 2 to 2 pts.wt. talc to 100 pts.wt. of the ceramic material.

公开(公告)号：JPH09209830A

公开(公告)日：1997-08-12

申请号：JP2075896

申请日：1996-02-07

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: F02F3/26 ,  B01D53/86 ,  B01D53/94 ,  F02B3/06 ,  F02B23/06 ,  F16J1/01

Abstract: PROBLEM TO BE SOLVED: To reduce a pollutant in exhaust gas down to a demanded level by a simple facility. SOLUTION: It is manufactured through a carrier layer forming process to form a carrier layer consisting of porous ceramics by flame coating the ceramics by using a ceramics mixture with ceramics powder as its main component on a surface of a combustion wall 19 of a metallic piston 1 and a catalyst layer forming process to form a catalyst layer 2 carrying noble metal as a catalyst component by drying and sintering a carrier layer after impregnating it with a noble metal compound. It is favourable that the noble metal compound is H2 PtCl6 .6H2 O (chloroplatinic acid), Pd(NO3 )2 (palladium nitrate), Rh(NO3 )3 (rhodium nitrate), Ru(NO3 )2 ruthenium nitrate or IrCl2 (iridium chloride), and it is favourable that the ceramics mixture contains a hole forming agent at a proportion of 2-5 volume % to ceramics powder.

公开(公告)号：JPH0932540A

公开(公告)日：1997-02-04

申请号：JP17713295

申请日：1995-07-13

Applicant: HINO MOTORS LTD

Inventor： SHIMODA MASATOSHI ,  HOSOYA MITSURU

IPC: F01N3/02 ,  B01D53/94 ,  F01N3/05 ,  F01N3/20 ,  F01N3/22 ,  F01N3/24 ,  F01N3/28 ,  F01N9/00 ,  F01N13/02 ,  F02B37/00

Abstract: PROBLEM TO BE SOLVED: To more efficiently reduce NOx by actuating a cooling system on the basis of respective detecting outputs of temperature, rotation and load sensors when the temperature sensor detects that exhaust gas of a diesel engine exceeds a prescribed temperature. SOLUTION: Operation of a diesel engine 11 is continued, and when a temperature sensor 31 detects that an exhaust gas temperature exceeds a prescribed temperature, a controller 36 actuates a directional control valve 26b and a force feed pump 26c, and a hydrocarbon type reducing agent 33 is injected from an injection nozzle 26. At the same time, respective detecting outputs of temperature, rotation and load sensors 31, 23 and 24 are compared with a map stored in a memory 36b, and are controlled by finding optimal opening of an opening adjusting valve 19. The inside of an air introducing pipe 17 is put under negative pressure by an exhaust gas flow injected into one end of a downstream exhaust pipe 13b from the other end of an upstream side exhaust pipe 13a, and an air flow running toward one end from the other end of the air introducing pipe 17 is generated, and this air flows in the downstream exhaust pipe 13b. As a result, exhaust gas is mixed with air in the atmosphere, and an exhaust gas temperature is lowered.

公开(公告)号：JPH08150339A

公开(公告)日：1996-06-11

申请号：JP29619994

申请日：1994-11-30

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: F01N3/28 ,  B01D53/86 ,  B01D53/94 ,  B01J27/053 ,  B01J27/185

Abstract: PURPOSE: To obtain a catalyst by which exhaust gas is stably and efficiently purified by feeding a reducing agent such as light oil even in the presence of water by carrying a specified amt. of a noble metal such as Pt or Pd on a phosphoric acid compd. CONSTITUTION: Aluminum phosphate powder is mixed with a silica sol and water to prepare a slurry for wash coating and a honeycomb monolithic carrier 11 is dipped in the slurry and fired under atmospheric pressure to form an aluminum phosphate layer 12 on the surface of the carrier 11. This carrier 11 is then dipped in an aq. soln. of chloroplatinic acid, etc., dried and fired in a reducing atmosphere to carry 0.01-5wt.% noble metal selected from among Pt, Pd, Rh and Ir. Since the resultant noble metal carried phosphoric acid compd. has a relatively large amt. of a solid acid activating a catalyst, NOx is efficiently diminished in the presence of NO, hydrocarbons and oxygen.

公开(公告)号：JPH0796200A

公开(公告)日：1995-04-11

申请号：JP24458393

申请日：1993-09-30

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU ,  TOMONO YASUYUKI ,  SATO SHINYA

IPC: B01D53/86 ,  B01D53/94 ,  B01J29/46

Abstract: PURPOSE:To produce a catalyst having heat resistance at high temp. and attaining the reduction of the amt. of NOx contained in exhaust gas with high efficiency even under coexistence of water. CONSTITUTION:High silica zeolite having a ratio of (50-150):1 between SiO2 and Al2O3 is stuck on the surface of monolithic zeolite and Cu is carried on the high silica zeolite to produce the objective catalyst.

公开(公告)号：JPH0796190A

公开(公告)日：1995-04-11

申请号：JP24458193

申请日：1993-09-30

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: B01D53/86 ,  B01D53/94 ,  B01J21/08 ,  B01J23/72 ,  B01J23/74 ,  B01J23/745 ,  B01J23/75 ,  F02B1/04

Abstract: PURPOSE:To stably reduce the amt. of NOx contained in exhaust gas with high efficiency even under coexistence of water or even at a high temp. of >600 deg.C. CONSTITUTION:A transition metal such as Cu or Co is carried on an SiO2-ZrO2 multiple oxide or a sintered compact of the multiple oxide preferably by 0.1-5.0wt.%. The specific surface area of the multiple oxide is 30-400m /g and the molar ratio of SiO2:ZrO2 is preferably 5:95 to 95:5.

公开(公告)号：JPH0671182A

公开(公告)日：1994-03-15

申请号：JP25074792

申请日：1992-08-26

Applicant: HINO MOTORS LTD

Inventor： UEMITSU ISAO ,  SHIMODA MASATOSHI ,  HOSOYA MITSURU

IPC: B01D53/94 ,  B01J35/04 ,  F01N3/10 ,  B01D53/36

Abstract: PURPOSE:To obtain a catalyst capable of controlling the carried amount of active metals according to the depth of a ceramic powder or wash coat layer, highly active and great in purifying power by a method wherein either an oxidation or reduction catalyst or either honeycomb or pellet catalyst is easily produced according to the kinds of the active metals to be carried. CONSTITUTION:An active metal 21a is carried on the surface layer 20 of a ceramic powder layer 21 by ion implantation, this active metal carrying ceramic powder, together with a binder, is admixed with a solvent to prepare a slurry, a ceramic or metal made honeycomb carrier is immersed in this slurry, removed therefrom, dried and baked and a wash coat is formed on the wall surface of the honeycomb carrier.

公开(公告)号：JPH0571331A

公开(公告)日：1993-03-23

申请号：JP25440591

申请日：1991-09-06

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU ,  UEMITSU ISAO

IPC: F01N3/02 ,  B01D53/94 ,  B01D53/96 ,  F01N3/08 ,  F01N3/28 ,  F02B3/06

Abstract: PURPOSE:To recovery unconverted reducing agent by providing an unconverted agent supply device and a reduction device, a casing in which an adsorbing zone and a regenerative zone are partitioned inside, a heated exchanger which connects to an adsorber on the downstream side from the reduction device, and connecting an air supply device to the heat exchanger and providing a recovery pipe on the adsorber. CONSTITUTION:An exhaust gas purification device 10 is applicable to the exhaust system of a diesel engine 70, and it is constituted of a reduction device 11, a reducing agent supply device 12, an adsorber 13, a heat exchanger 14, an air supply device 15, a recovery pipe 16, a branched exhaust pipe 17, the exhaust changeover device 18, and a computer 19 which controls the reduction supply device 12, the adsorber 13, the air supply device 15 and the exhaust gas changeover device 18, in response to rotational speed, load and temperature of exhaust gas of a diesel engine 70. Consequently, NOx included in the exhaust gas and discharged from the diesel engine 70 is treated in reduction by the reducing agent, the exhaust gas is cooled in the heat exchanger 14, the unconverted reducing agent is recovered in the reduction device 11 and utilized so as to suppress a consumption quantity of the reducing agent.

公开(公告)号：JPH0565817A

公开(公告)日：1993-03-19

申请号：JP25485391

申请日：1991-09-05

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: F01N3/02 ,  F01N3/08 ,  F01N3/24 ,  F01N9/00 ,  F02B3/06

Abstract: PURPOSE:To avoid release of SOF discharged from catalysts to the atmosphere to reduce SOF by arranging a main oxidizing device in the midst of an exhaust pipe of a diesel engine, connecting an auxiliary oxidizing device to the exhaust pipe through a branch pipe, arranging a main shut-off valve in the exhaust pipe, and arranging an auxiliary shut-off valve in the branch pipe. CONSTITUTION:A main oxidizing device 11 having an oxidation catalyst 19 is arranged in the midst of an exhaust pipe 42 of a diesel engine 40. An auxiliary oxidizing device 12 having a filter 23 and an oxidation catalyst 24 is connected to the exhaust pipe 42 in the downstream of the main oxidizing device 11 through a branch pipe 16. A main shut-off valve 13 is arranged in the exhaust pipe 42 in the downstream of a connection of the branch pipe 16, and an auxiliary shut-off valve 14 is arranged in the branch pipe 16. A computer 15 opens and closes the main and auxiliary shut-off valves 13, 14 to switch the paths of exhaust gas to reduce SOF discharged from the diesel engine 40, depending whether the temperature of exhaust gas is low, the temperature is raised from low temperature to high temperature, or the temperature is high.