Engine system and control method thereof

An engine system and engine technology, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problem that the emission of nitrogen oxides in exhaust gas cannot be effectively reduced, urea and exhaust gas cannot be fully mixed, and exhaust gas cannot be well eliminated. problems, to achieve the effect of saving costs, avoiding secondary pollution, and improving utilization

Inactive Publication Date: 2015-01-21
HITACHI AUTOMOTIVE SYST SUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to reduce the pollution caused by vehicle exhaust gas to the environment, the usual method is to recirculate the exhaust gas from the engine (EGR) or use the catalyst in the purifier installed on the exhaust pipe to treat the exhaust gas. When recycling, the emission of various nitrogen oxides contained in the exhaust gas cannot be effectively reduced, and when the catalyst is used to treat the exhaust gas, it is easy to cause secondary pollution due to the catalyst
[0004] In addition, in order to solve the problem of exhaust emissions, Patent Document 1 discloses the technology of injecting urea to the exhaust pipe on the downstream side of the engine. The problem of nitrogen oxides

Method used

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  • Engine system and control method thereof

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Embodiment approach 1

[0045] Below, refer to figure 1 An engine system according to Embodiment 1 of the present invention will be described.

[0046] Such as figure 1 As shown, the engine system includes: an engine 10 having a cylinder 11 , and an exhaust pipe 20 that discharges exhaust gas generated in the cylinder 11 of the engine 10 . Here, a purifier 21 for catalytically treating harmful substances in exhaust gas is connected in the middle of the exhaust pipe 20 , but this purifier 21 is not essential.

[0047] In addition, the engine system further includes: a urea storage tank 30 storing urea; and a nozzle 40 communicating with the urea storage tank 30 via an injection control valve 50 to inject urea into the cylinder 11 .

[0048] In addition, the engine system may also include a control unit (such as an ECU control unit) to control the opening and closing of the injection control valve 50 according to the operating conditions of the engine 10 (such as load and speed, etc.), so as to use t...

Embodiment approach 2

[0057] Below, refer to image 3 An engine system according to Embodiment 2 of the present invention will be described. Here, the same reference numerals are assigned to the same parts as those in Embodiment 1 above, and detailed description thereof will be omitted.

[0058] In this embodiment, if image 3 As shown, the engine system includes the engine 10, the exhaust pipe 20, the urea storage tank 30, the injection nozzle 40, the injection control valve 50 and the unshown control unit as in the first embodiment, and also includes a first branch pipe FC1, the urea recovery tank 70 and the urea replenishment pipe BC, wherein the first branch pipe FC1 branches out from the first branch part B1 of the exhaust pipe 20, and communicates with the urea recovery tank 70, and the urea recovery tank 70 is connected to the The urea in the exhaust gas delivered by the first branch portion B1 of the exhaust pipe 20 is recovered, and the urea replenishment pipe BC connects the urea recove...

Embodiment approach 3

[0067] Below, refer to Figure 5 An engine system according to Embodiment 3 of the present invention will be described. Here, the same reference numerals are assigned to the same parts as those of Embodiments 1 and 2 and their modifications described above, and detailed description thereof will be omitted.

[0068] In this embodiment, if Figure 5 As shown, the engine system includes an engine 10, an exhaust pipe 20, a urea storage tank 30, a nozzle 40, an injection control valve 50, an unillustrated control unit, and a first branch pipe FC1 in addition to the above-mentioned modified example of the second embodiment. , urea recovery tank 70, urea replenishment pipe BC, filter 80 and urea recovery pump 90, also includes a second branch pipe FC2, a waste gas intercepting valve V1 and a waste gas release valve V2, wherein the second branch pipe FC2 from The second branch part B2 of the exhaust pipe 20 on the downstream side of the exhaust gas discharge direction than the first...

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Abstract

Disclosed are an engine system and a control method thereof. Nitrogen oxides in the exhaust gas exhausted from an exhaust pipe of an engine can be effectively reduced. The engine system comprises the engine and the exhaust pipe; the engine comprises a cylinder; the exhaust gas produced in the cylinder of the engine is discharged through the exhaust pipe; the engine system also comprises a urea storage box and a spray nozzle; the urea storage box is used for storing urea; the spray nozzle is arranged in the cylinder and communicated with the urea storage box through an injection control valve. According to the engine system, the urea is injected into the cylinder through the spray nozzle and accordingly the injected urea liquid can be instantly atomized through the high temperature in the cylinder to enable the urea to be fully mixed with the exhaust gas and accordingly the chemical reaction between the nitrogen oxides contained in the urea and the exhaust gas is full and the nitrogen oxides in the exhaust gas exhausted from the exhaust pipe can be effectively reduced.

Description

technical field [0001] The invention relates to an engine system and a control method for the engine system. Background technique [0002] As the number of vehicles increases and the scope of use becomes wider and wider, the harm caused by vehicle exhaust to the world environment is also increasing. [0003] In order to reduce the pollution caused by vehicle exhaust gas to the environment, the usual method is to recirculate the exhaust gas from the engine (EGR) or use the catalyst in the purifier installed on the exhaust pipe to treat the exhaust gas. When recirculating, the emission of various nitrogen oxides contained in the exhaust gas cannot be effectively reduced, and when the exhaust gas is treated with a catalyst, it is easy to cause secondary pollution due to the catalyst. [0004] In addition, in order to solve the problem of exhaust emissions, Patent Document 1 discloses the technology of injecting urea to the exhaust pipe on the downstream side of the engine. th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N3/20
Inventor 吴敬明
Owner HITACHI AUTOMOTIVE SYST SUZHOU
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