IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0390815
(2010-08-03)
|
등록번호 |
US-8522532
(2013-09-03)
|
우선권정보 |
JP-2009-190843 (2009-08-20) |
국제출원번호 |
PCT/JP2010/063067
(2010-08-03)
|
§371/§102 date |
20120216
(20120216)
|
국제공개번호 |
WO2011/021497
(2011-02-24)
|
발명자
/ 주소 |
- Yamada, Shuichi
- Fujii, Yasuo
- Inoue, Katsushi
- Ishii, Yuuki
- Mitamura, Kenta
|
출원인 / 주소 |
|
대리인 / 주소 |
Panitch Schwarze Belisario & Nadel LLP
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
4 |
초록
▼
Provided is an exhaust-treatment device for a diesel engine, said device being capable of suppressing engine noise. In a first stage P1 of an exhaust-temperature-raising process, a target engine speed is set to a prescribed first target speed R1 and an intake throttle valve 41 is set to a prescribed
Provided is an exhaust-treatment device for a diesel engine, said device being capable of suppressing engine noise. In a first stage P1 of an exhaust-temperature-raising process, a target engine speed is set to a prescribed first target speed R1 and an intake throttle valve 41 is set to a prescribed first degree of opening O1. In a second stage P2, the target engine speed is maintained at the first target speed R1 and the intake throttle valve 41 is set to a position more closed than the first degree of opening O1. When a set duration T2 for the second stage P2 has come to an end, the intake throttle valve 41 is at a second degree of opening O2, which is maintained in third and subsequent stages P3/P4. In said third and subsequent stages P3/P4, as a set duration T3/T4 for each stage P3/P4 passes, the target engine speed is updated to a target speed R2/R3 higher than the target speed R1/R2 during the immediately prior stage P2/P3, and the temperature of DPF1 upstream exhaust gas 12 is increased.
대표청구항
▼
1. An exhaust treatment device for a diesel engine, including a DPF 1, an exhaust gas temperature sensor 40 for detecting a temperature of an exhaust gas 12 on an upstream side of the DPF 1, an intake throttle valve 41, control means 14, and memory means 5, wherein a target temperature DT of the exh
1. An exhaust treatment device for a diesel engine, including a DPF 1, an exhaust gas temperature sensor 40 for detecting a temperature of an exhaust gas 12 on an upstream side of the DPF 1, an intake throttle valve 41, control means 14, and memory means 5, wherein a target temperature DT of the exhaust gas 12 on the upstream side of the DPF 1, a first valve opening degree O1 of the intake throttle valve 41, and set durations T1, T2, T3, and T4 for stage processings of exhaust gas temperature rise processing are stored in the memory means 5, and in regeneration of the DPF 1 by burning and removing PM, accumulated on the DPF 1, by using heat of the exhaust gas 11, the control means 14 performs a first stage processing P1 of the exhaust gas temperature rise processing, wherein in the first stage processing P1, a target rotation number of the engine is set to a predetermined first target rotation number R1 and an opening degree of the intake throttle valve 41 is set to the first valve opening degree O1, if the temperature of the exhaust gas 12 on the upstream side of the DPF 1 does not reach the target temperature DT and the set duration T1 of the first stage processing P1 has elapsed, the control means 14 performs a second stage processing P2 of the exhaust gas temperature rise processing, wherein in the second stage processing P2, the target rotation number of the engine is maintained at the first target rotation number R1 and the opening degree of the intake throttle valve 41 is more closed than the first valve opening degree O1, if the temperature of the exhaust gas 12 on the upstream side of the DPF 1 does not reach the target temperature DT and the set duration T2 of the second stage processing P2 has elapsed, the control means 14 performs stage processings P3 and P4 in and after the third step of the exhaust gas temperature rise processing, wherein in the stage processings P3 and P4 in and after the third step, the opening degree of the intake throttle valve 41 is maintained at a second valve opening degree O2 at the time when the set duration T2 of the second stage processing P2 has reached until the temperature of the exhaust gas 12 on the upstream side of the DPF 1 reaches the target temperature DT, and the temperature of the exhaust gas 12 on the upstream side of the DPF 1 is raised by updating the target rotation number of the engine into target rotation numbers R2 and R3, each higher than each of the target rotation numbers R1 and R2 of the stage processings P2 and P3 right before, based on an elapse of the set durations T3 and T4 of the stage processings P3 and P4. 2. The exhaust treatment device according to claim 1, wherein when the temperature of the exhaust gas 12 on the upstream side of the DPF 1 reaches the target temperature DT, the control means 14 maintains the target rotation numbers R1, R2, and R3 and the opening degrees O1 and O2 of the intake throttle valve 41 at that time for a predetermined time period since that time. 3. The exhaust treatment device according to claim 1, further comprising fuel addition means 42, wherein when the temperature of the exhaust gas 12 on the upstream side of the DPF 1 reaches the target temperature DT, the control means 14 adds unburnt fuel to the exhaust gas 12 on the upstream side of the DPF 1 through the fuel addition means 42 so that the unburnt fuel is burnt by oxygen included in the exhaust gas 12. 4. The exhaust treatment device according to claim 3, wherein a DOC 10 is disposed on the upstream side of the DPF 1, so that the DOC 10 catalytically burns unburnt fuel using oxygen included in the exhaust gas 12. 5. The exhaust treatment device according to claim 1, wherein the exhaust gas temperature rise processing is performed during a non-operation of a machine on which the engine is mounted, in which both driving and working of the machine are stopped, but is not performed during an operation of the machine in which at least one of the driving and working of the machine is performed. 6. The exhaust treatment device according to claim 1, wherein the temperature of the exhaust gas 12 on the upstream side of the DPF 1 is raised even without installing an exhaust throttle valve by controlling the intake throttle valve 41 and step by step updating the target rotation number of the engine.
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