CN203285519U

CN203285519U - Novel purification system for aftertreatment of automobile exhaust

Info

Publication number: CN203285519U
Application number: CN2013201556947U
Authority: CN
Inventors: 赵永来; 王利鹤; 宋玉琪; 林凡雨; 牛文学; 厍银柱; 辛建辉; 潘坤
Original assignee: Vocational and Technical College of IMAU
Current assignee: Vocational and Technical College of IMAU
Priority date: 2013-03-18
Filing date: 2013-03-18
Publication date: 2013-11-13
Anticipated expiration: 2023-03-18

Abstract

The utility model discloses a novel purification system for aftertreatment of automobile exhaust. The novel purification system for the aftertreatment of the automobile exhaust comprises a vehicle-mounted computer ECU, a shell body, a catalytic cleaner tube body, a catalytic agent carrier, an exhaust change-over valve, an oxygen sensor, a heater, a temperature sensor, a pressure sensor, a particle collecting device, a burner and air supplying holes, wherein the oxygen sensor, the heater, the pressure sensor, the burner and the air supplying holes are all connected with the vehicle-mounted computer ECU through wires and are all controlled by the vehicle-mounted computer ECU. The novel purification system for the aftertreatment of the automobile exhaust has the advantages that the service life of a catalytic agent can be prolonged and catalytic conversion efficiency of the automobile exhaust can be improved comprehensively.

Description

A kind of vehicle tail gas post-processing purifying system

Technical field

The utility model relates to a kind of vehicle tail gas post-processing purifying system, belongs to field of environment protection.

Background technique

At present, when the motor car engine cold start-up stage starts,, because air-fuel mixture is not enough, still need suitable overfueling just can make the engine reliable starting.And the delivery temperature of the vehicle exhaust of this moment is lower, and catalyzer also is in low-temperature condition, reaches far away initiation temperature, and this just makes vehicle exhaust with catalyzer, not contact fully and react, and can cause very high HC discharging.

In the process of motor car engine operation, the complex compound of the imperfect combustion easy forming component complexity of product in motor, and along with flowing of tail gas air-flow, easily be attached on the surface of the carrier of bearing catalyst and catalyzer, form carbon deposit, more chemical complex and carbon deposit not only make the duct on the carrier of bearing catalyst blocked, cause air-flow obstructed, form back pressure, finally cause the engine operation difficulty, affect working efficiency; Simultaneously also can cover catalyst surface, make tail gas can't fully contact with catalyzer, cause the discharging of NO and CO to exceed standard.

the catalytic converter of present existing vehicle exhaust is a single tube, then the carrier of bearing catalyst is placed in one, and particle trapper and regeneration techniques have wherein also been applied, be used for the particulate of tail gas and the seizure of complex compound, collect and the regeneration processing, make complex compound in vehicle exhaust, the catalyzed conversion effect of the capture of particulate and regeneration processing and tail gas and catalyzer is to carry out simultaneously, but can make like this exhaust sometimes without good filtration and purification, just directly discharge, befouling environment not only, and will shorten widely life-span of particle trapper when serious.

Particulate is one of important composition in the motor vehicle exhaust emission pollutant, and the mean particle dia size of particulate is also the key factor that is detrimental to health, and namely mean particle dia is less, endangers larger.Although adopted the particulate capturing technology, relatively good to major diameter particulate effect, the seizure of minor diameter particulate and collection efficiency are very low, and is also larger for the harm of environment and human body.

According to the fluid force Xue Zhi, when vehicle exhaust flows in outlet pipe, central authorities gas flow relatively the periphery gas flow rates very fast, when tail gas passes through the carrier of bearing catalyst, shorter with the time of contact of catalyzer, reaction can not be carried out fully, so just causes not exist and does not discharge through the vehicle exhaust that purifies, and causes environmental pollution.

The model utility content

The utility model is mainly for existing Exhaust Gas Catalytic Converter for Automobiles and the existing problem of catalytic conversion process, the technological scheme that proposes is: a kind of vehicle tail gas post-processing purifying system comprises vehicle-mounted computer ECU, housing, catalytic cleaner body, catalyst carrier, exhaust changing valve, lambda sensor, heater, temperature transducer, pressure transducer, micro particle catching body, burner, air supply hole.It is characterized in that housing is that two identical catalytic cleaner bodys are formed in parallel, lambda sensor, heater, pressure transducer are installed on the suction tude of housing successively, the steam outlet pipe place of housing is equipped with another pressure transducer; The handing-over position of the catalytic cleaner body of two parallel connections is equipped with the exhaust changing valve, in order to control opening and closing of two catalytic cleaner bodys, the air inlet expanding duct of catalytic cleaner body is circular-arc expansion, so that the entering in the catalytic converter body of gas spiral shape; Large aperture particle trapper, small aperture particle trapper and catalyst carrier are installed in the catalytic converter body from right to left successively, burner all is installed in particle trapper, there is air supply hole on the side of burner, and some ducts that the catalyst carrier top has gas to pass through, the diameter in duct is reduced to the vicinity, center successively by periphery, so that the Negotiation speed of gas reduces, and being evenly distributed of air-flow, extend the time of contact of gas and catalyzer, improve gas cleaning efficiency; The above-mentioned middle lambda sensor of mentioning, heater, pressure transducer, burner and air supply hole are connected by wire with vehicle-mounted computer ECU respectively, are subjected to the control of vehicle-mounted computer ECU.This cover system device can extending catalyst working life, comprehensively improve the catalytic conversion efficiency of vehicle exhaust.

Below the utility model is done further technical order.

when the motor car engine cold start-up stage starts, the delivery temperature of vehicle exhaust is lower, catalyzer also is in low-temperature condition, vehicle-mounted computer ECU can receive the signal of temperature transducer and make the order that starts heater, heater starts heating immediately, makes the temperature of vehicle exhaust reach the needed temperature of catalyzed conversion, under the automobile normal operating condition, two exhaust conversion valves are opened simultaneously, two catalytic cleaners in parallel are worked simultaneously, and in lambda sensor detection vehicle exhaust, whether the content of oxygen can meet the use of tail gas in catalytic process, when the content that oxygen detected was less, vehicle-mounted computer ECU can be by controlling air supply hole to suitable supplementary air in tail gas, when exhaust emissions to a certain extent after, particle trapper will trap a large amount of exhaust gas particles, a large amount of particulates have inhibition to air-flow, at this moment the pressure transducer of shell air inlet and the air outlet pressure that can detect before and after the catalytic cleaner body does not wait, vehicle-mounted computer ECU will send the order of closing one of them exhaust changing valve, gas is never closed in that catalytic cleaner body of exhaust changing valve and is passed through, being closed simultaneously the order that burner in this catalytic cleaner body after the exhaust changing valve and air supply hole can carry out vehicle-mounted computer ECU will be large, the rapid ignition combustion of particulate on little tail gas gathering device, aperture space in particle trapper is discharged, being convenient to tail gas passes through, then vehicle-mounted computer ECU can send and open the exhaust changing valve that this is closed, close the exhaust changing valve of originally not closing, make the particle burning on particle trapper in remaining this catalytic cleaner body, discharge aperture space wherein, last vehicle-mounted computer ECU gives an order and opens this exhaust changing valve, and two catalytic cleaners in parallel are worked again simultaneously.

Description of drawings

Fig. 1 is axial sectional structure schematic diagram of the present utility model.

Fig. 2 is electronic control schematic diagram of the present utility model.

In figure: 1 and 20 are: catalyst carrier, 2 and 19 are: small aperture micro particle catching body, and 3,5,16,18 are: air supply hole, 4,6,15,17 are: burner, 7 and 14 are: large aperture micro particle catching body, 8 are: the catalytic cleaner body, and 9 are: heater, 10 are: lambda sensor, 11 are: temperature transducer, 12 and 21 are: pressure transducer, 13 are: exhaust transforms valve, and 22 are: housing.

Embodiment

As shown in Figure 1 and Figure 2, a kind of vehicle tail gas post-processing purifying system, comprise vehicle-mounted computer ECU, housing 22, catalytic cleaner body 8, catalyst carrier 1, exhaust changing valve 13, lambda sensor 10, heater 9, temperature transducer 11, pressure transducer 12, small aperture micro particle catching body 2, large aperture particle trapper 7, burner 4, air supply hole 3.when the motor car engine cold start-up stage starts, the delivery temperature of vehicle exhaust is lower, catalyzer also is in low-temperature condition, vehicle-mounted computer ECU can receive the signal of temperature transducer 11 and make the order that starts heater 9, heater starts heating immediately, makes the temperature of vehicle exhaust reach the needed temperature of catalyzed conversion, under the automobile normal operating condition, two exhaust changing valves 13 are opened simultaneously, two catalytic cleaners 8 in parallel are worked simultaneously, and whether the content that lambda sensor 10 detects oxygen in vehicle exhaust can meet the use of tail gas in catalytic process, when the content that oxygen detected was less, vehicle-mounted computer ECU can be by controlling air supply hole 4,6,15,17 to suitable supplementary air in tail gas, when exhaust emissions to a certain extent after, particle trapper will trap a large amount of exhaust gas particles, a large amount of particulates have inhibition to air-flow, at this moment the pressure transducer 12 of shell air inlet and air outlet and 21 pressure that catalytic cleaner body 8 front and back can be detected does not wait, vehicle-mounted computer ECU will send the order of closing one of them exhaust changing valve 13, gas is never closed in that catalytic cleaner body 8 of exhaust changing valve and is passed through, being closed simultaneously the order that burner in this catalytic cleaner body 8 after exhaust changing valve 13 and air supply hole can carry out vehicle-mounted computer ECU will be large, the rapid ignition combustion of particulate on little tail gas gathering device, aperture space in particle trapper is discharged, being convenient to tail gas passes through, then vehicle-mounted computer ECU can send and open the exhaust changing valve that this is closed, close the exhaust changing valve of originally not closing, make the particle burning on particle trapper in remaining this catalytic cleaner body, discharge aperture space wherein, last vehicle-mounted computer ECU gives an order and opens this exhaust changing valve, and two catalytic cleaners in parallel are worked again simultaneously.This cover system device can extending catalyst working life, comprehensively improve the catalytic conversion efficiency of vehicle exhaust.

Claims

1. vehicle tail gas post-processing purifying system, comprise vehicle-mounted computer ECU, housing, catalytic cleaner body, catalyst carrier, exhaust changing valve, lambda sensor, heater, temperature transducer, pressure transducer, micro particle catching body, burner, air supply hole, it is characterized in that: housing is that two identical catalytic cleaner bodys are formed in parallel, lambda sensor, heater, pressure transducer are installed on the suction tude of housing successively, and the steam outlet pipe place of housing is equipped with another pressure transducer; The handing-over position of the catalytic cleaner body of two parallel connections is equipped with the exhaust changing valve, in order to control opening and closing of two catalytic cleaner bodys, the air inlet expanding duct of catalytic cleaner body is circular-arc expansion, so that the entering in the catalytic converter body of gas spiral shape; Large aperture particle trapper, small aperture particle trapper and catalyst carrier are installed in the catalytic converter body from right to left successively, burner all is installed in particle trapper, there is air supply hole on the side of burner, and the duct that the catalyst carrier top has gas to pass through, the diameter in duct is reduced to the vicinity, center successively by periphery; The above-mentioned middle lambda sensor of mentioning, heater, pressure transducer, burner and air supply hole are connected by wire with vehicle-mounted computer ECU respectively, are subjected to the control of vehicle-mounted computer ECU.