公开(公告)号：JP2002097940A

公开(公告)日：2002-04-05

申请号：JP2000294052

申请日：2000-09-27

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU ,  HIRABAYASHI HIROSHI

IPC: F01N3/20 ,  F01N3/08 ,  F01N3/28 ,  F01N3/36

Abstract: PROBLEM TO BE SOLVED: To eliminate poisoning by sulfate of a NOX storage reducing catalyst without performing operation control in diesel engine side, in the case of controlling exhaust emission of a diesel engine by the NOX storage reducing catalyst. SOLUTION: Relating to this operating method of an exhaust emission control device constituted by equipping a NOX storage reducing catalyst 11 in the halfway of an exhaust pipe 9 circulating exhaust gas 7 from a diesel engine 1 to suitably add a reducing agent 10 relating to this NOX storage reducing catalyst 11 and suitably make it detour around the NOX storage reducing catalyst 11 so as to make exhaust gas capable of flowing, periodically the reducing agent 10 is added while allowing the exhaust gas 7 to flow in the NOX storage reducing catalyst 11, to make its temperature rise to a prescribed temperature or more, additionally just thereafter the reducing agent 10 is made to detour around the NOX storage reducing catalyst 11 and again added thereto while allowing the exhaust gas to flow, de-vulcanization treating is applied.

公开(公告)号：JP2002081313A

公开(公告)日：2002-03-22

申请号：JP2001052210

申请日：2001-02-27

Applicant: HINO MOTORS LTD

Inventor： FUNAYAMA NOBUHIRO ,  SHIMOKAWA KIYOHIRO ,  HOSOYA MITSURU

IPC: F02M25/07 ,  F01N3/08 ,  F01N3/24 ,  F02D21/08 ,  F02D41/04 ,  F02D41/38 ,  F02D43/00

Abstract: PROBLEM TO BE SOLVED: To provide an exhaust emission controlling method for a diesel engine allowing extreme improvement of a NOX purification rate as compared with a conventional rate. SOLUTION: Regarding the exhaust emission controlling method for the diesel engine 1 equipped with a NOX reduction catalyst (selective reduction type catalyst 8) at the middle of an exhaust pipe 7, at least either one of a method for increasing recirculating rate of exhaust gas 5 from an exhaust side to an intake side and a method for throttling intake air quantity is adopted to reduce an oxygen excess ratio within a cylinder up to the vicinity of a limit without causing generation of black smoke and to reduce the oxygen excess ratio in exhaust gas 5 at an inlet of the NOX reduction catalyst up to

公开(公告)号：JP2001317346A

公开(公告)日：2001-11-16

申请号：JP2000135764

申请日：2000-05-09

Applicant: HINO MOTORS LTD

Inventor： SHIMODA MASATOSHI ,  HOSOYA MITSURU

IPC: F01N3/28 ,  F01N3/08 ,  F01N3/20

Abstract: PROBLEM TO BE SOLVED: To prevent a sulfate from being formed by an oxidation catalyst even when arranging the oxidation catalyst at the front stage of an NOX reduction catalyst. SOLUTION: The oxidation catalyst 11 is arranged midway of an exhaust pipe 9 in which exhaust gas 7 flows, and the NOX reduction catalyst 13 allowing NOX to selectively react with urea water 24 even under coexistence with oxygen is arranged in the downstream of the oxidation catalyst 11. The urea water 24 is properly added to the NOX reduction catalyst 13 from an injection nozzle 25, and the exhaust gas 7 can be guided to the NOX reduction catalyst 13 by properly detouring the oxidation catalyst 11 through a by-pass passage 14.

公开(公告)号：JP2001073748A

公开(公告)日：2001-03-21

申请号：JP25173399

申请日：1999-09-06

Applicant: HINO MOTORS LTD

Inventor： SHIMODA MASATOSHI ,  HOSOYA MITSURU ,  MOGI HIRONOBU

IPC: B01D39/14 ,  B01D53/94 ,  F01N3/02 ,  F01N3/023 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N3/36 ,  F02D41/04 ,  F02D41/14 ,  F02D41/40 ,  F02D43/00

Abstract: PROBLEM TO BE SOLVED: To prevent a filter from harmful clogging caused by accumulation of particulates by oxidative removal of particulates which is done by the affection of breakthrough NO2 to the diesel particulate filter as oxidizing agent, here, breakthrough NO2 is generated by forcing the NOx occludent reduction catalyst to occlude NOx excessively. SOLUTION: During usual operation in lean condition, NO is oxidized mainly to NO2 by NOx occludent reduction catalyst 8 and occluded therein, and breakthrough NO2 is generated by continuous operation. Utilizing this NO2 as oxidizing agent, oxidative removal of particulates which are trapped on the DPF (particulate filter) is practiced. In the next place, catalyst 8 is regenerated by reductive removal of NO2 occluded therein, by switching the engine operation to rich condition. After regeneration, it returns to the continuous operation of DPF cleaning by breakthrough NO2 in lean condition, and then, the cycle of regeneration of NOx occludent reduction catalyst is repeatedly carried out.

公开(公告)号：JP2001050034A

公开(公告)日：2001-02-23

申请号：JP21961799

申请日：1999-08-03

Applicant: HINO MOTORS LTD

Inventor： SATO SHINYA ,  HOSOYA MITSURU ,  SHIMODA MASATOSHI

IPC: F02M25/07 ,  F01N3/08 ,  F01N3/20 ,  F01N3/28 ,  F01N3/36

Abstract: PROBLEM TO BE SOLVED: To achieve a practical use of an emission exhaust gas purification device in which by control NOx is released actively from a NOx storage compound according to a reactive temperature range of a NOx reduction catalyst, and the NOx storage compound is compatibly used as the NOx reduction catalyst. SOLUTION: NOx in exhaust gas 2 is oxidized and stored as nitrate temporarily by a NOx storage compound 4. By adding at least one kind among H2, CO, and HC to the exhaust gas 2, while an engine is operated with a necessarily reduced intake air amount to be leaner than a stoichiometric air-fuel ratio, NOx is decomposed and released from the NOx storage compound 4 so as to regenerate the NOx storage compound 4. The released NOx is reduced and purified through being reacted with at least one kind among H2, CO, and HC on a NOx reduction catalyst 5.

公开(公告)号：JP2000220445A

公开(公告)日：2000-08-08

申请号：JP2219299

申请日：1999-01-29

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU ,  TSUJI YUKIHIRO

IPC: F02B37/24 ,  F01N3/08 ,  F01N3/24 ,  F01N3/28 ,  F02B37/12

Abstract: PROBLEM TO BE SOLVED: To improve NOx reduction effect by controlling exhaust gas temperature actively to be an active temperature area of NOx reducing catalyst. SOLUTION: An exhaust emission control device of an internal-combustion engine is provided with NOx reducing catalyst 12 on the way of an exhaust pipe 10 to pass exhaust gas 8. The device is constructed to add required amount of reducing agent 14 to exhaust gas 8 at a upper stream side than a position of NOx reducing catalyst 12. The device adopts a variable geometry turbo charger 2 as a turbo charger and is provided with a control device 20. The control device 20 outputs an opening increase/decrease order 22 to an actuator 22 to incline and move a nozzle vane of a turbine 2b in the turbo charger 2 and controls the amount of inlet air so that the temperature of exhaust gas 8 can be an active temperature area of NOx reducing catalyst 12.

公开(公告)号：JP2000026834A

公开(公告)日：2000-01-25

申请号：JP19718298

申请日：1998-07-13

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: F01N3/08 ,  B01D53/86 ,  C09K3/00 ,  F01N3/20

Abstract: PROBLEM TO BE SOLVED: To provide a reducing agent composition having high practicability under cold conditions and prepared by depressing the freezing point of an aqueous urea solution being a reducing agent supplied in reducing NOx in an exhaustion gas from an internal combustion engine with a selective reduction catalyst. SOLUTION: There is provided a reducing agent composition which is an aqueous-urea-solution-based reducing composition which, in reducing NOx in an exhaustion gas from an internal combustion engine with a selective reduction catalyst, is supplied by injection into a stream of the gas before its contact with the catalyst and contains a freezing point depressant comprising at least one hydroxyl organic compound. In one embodiment, the hydroxyl organic compound is selected among alcohols, glycols, and cellosolves. In another embodiment, the composition comprises 1-50 wt.% urea, 20-80 wt.% water, and 0.1-50 wt.% hydroxyl organic compound.

公开(公告)号：JPH10296080A

公开(公告)日：1998-11-10

申请号：JP11210597

申请日：1997-04-30

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: F01N3/10 ,  B01D53/94 ,  B01J23/38 ,  B01J23/40 ,  B01J23/46 ,  B01J23/66 ,  B01J35/04 ,  F01N3/28

Abstract: PROBLEM TO BE SOLVED: To secure a wide temperature range of high catalytic activity by building up a precious metal plated layer on the surface of a stainless steel honeycomb substrate and thereby significantly improving the durability of a catalyst. SOLUTION: A precious metal 5 is plated on a thin stainless steel sheet (foil), and the plated corrugated stainless steel sheet (foil) 4 and a plated unformed plain stainless steel sheet (foil) are stacked and rolled, so that honeycomb through holes are aligned. Consequently, a honeycomb catalyst with a uniformly air-permeable cross-section is obtained. The honeycomb catalyst plated with a precious metal, e.g. Ag which shows a high activity in a high temperature area is arranged in the upstream side of the roll. On the other hand, the honeycomb catalyst plated with a precious metal, e.g. Ir, Rh, Pd or Pt which shows the high activity in a medium or low temperature area, is arranged in the downstream side (in a catalytic converter) of the roll. Thus it is possible to achieve the high efficiency over the wide temperature area regarding both NOx and HC reduction.

公开(公告)号：JPH10212931A

公开(公告)日：1998-08-11

申请号：JP1541097

申请日：1997-01-29

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU ,  SHIMODA MASATOSHI

IPC: F01N3/08 ,  F01N3/20 ,  F01N3/24 ,  F01N3/36 ,  F01N9/00

Abstract: PROBLEM TO BE SOLVED: To reduce the amount of NOx to be discharged by introducing reductants injection-controlled in a pulse form to an exhaust pipe via a pump and a solenoid valve when an exhaust gas temperature is a specified temperature. SOLUTION: The temperature of exhaust gas entering a catalyst 5 is detected by a temperature sensor 8 installed in the vicinity of a catalyst entrance in an exhaust pipe, an engine speed is detected by a rotation sensor 9 attached to an engine and a fuel load applied to the engine is detected by a load sensor 10 attached to an accelerator system. From these detected data, the optimal amount of reductants and optimal injection time are calculated and these calculated values are inputted to a pulse generator 13. Then, an operation signal is fed from the pulse generator 13 to a solenoid valve 12. This solenoid valve 12 is provided in the discharge side pipe of a pump 4 for pressure-supplying reductants from a reductant tank 11. Thus, when the solenoid valve 12 is operated by a pulse signal, reductants are injection-controlled in a pulse form and introduced via a nozzle in the tip part of a reductant pressure-feeding pipe.

公开(公告)号：JPH10156181A

公开(公告)日：1998-06-16

申请号：JP17982197

申请日：1997-07-04

Applicant: HINO MOTORS LTD

Inventor： HOSOYA MITSURU

IPC: B01D53/94 ,  B01J21/16 ,  B01J23/40 ,  B01J23/42 ,  B01J23/63 ,  B01J23/89 ,  B01J29/064

Abstract: PROBLEM TO BE SOLVED: To easily produce a catalyst ensuring a high rate of diminishing of nitrogen. SOLUTION: A porous ceramic substrate is coated with a mixture of particles of one or more kinds of elements of the Pt group selected from among Pt, Rh, Ir and Pd as active components with a carrier made of powder of one or more kinds of metal oxides selected from among alumina, iron oxide, cerium dioxide, magnesium oxide and zeolite and an inorg. binder. The particle diameter of the particles is preferably 0.1-30μm, 0.1-5wt.% of the particles are preferably mixed with 95-99.9wt.% of the powder and the thickness of a coating layer of the mixture is preferably 5-100μm.