CN100540859C

CN100540859C - Device for purifying waste gas from vehicle

Info

Publication number: CN100540859C
Application number: CNB2004100817663A
Authority: CN
Inventors: 黄祥熙; 陈俊雄
Original assignee: Kwang Yang Motor Co Ltd
Current assignee: Kwang Yang Motor Co Ltd
Priority date: 2004-12-30
Filing date: 2004-12-30
Publication date: 2009-09-16
Anticipated expiration: 2024-12-30
Also published as: CN1796735A

Abstract

A kind of device for purifying waste gas from vehicle, be arranged on the relief opening of engine, this device for purifying waste gas from vehicle comprises a drainage tube, one hollow pipe, one Lambda sensor, an and secondary air ingress pipe, this drainage tube and this relief opening link, the hollow pipe is fixedly arranged in this drainage tube and with this drainage tube and is separately, the hollow pipe defines one first space, and match with this drainage tube and to define second space around the first space outer periphery, Lambda sensor can detect first, two spaces are one waste gas air fuel ratio wherein, this secondary air ingress pipe, ambient air can be imported first, two spaces are another person wherein, see through the air fuel ratio of Lambda sensor detecting waste gas, and the secondary air that makes vehicle import does not disturb Lambda sensor.

Description

Device for purifying waste gas from vehicle

[technical field]

The invention relates to a kind of waste gas cleaning plant, be meant a kind of waste gas cleaning plant that is used for vehicle especially.

[background technique]

Consult Fig. 1, a kind of venting gas appliance 1 of known car engine include an engine 11, an air-strainer 12, two respectively the air of air-strainer 12 is introduced suction tude 13, two outlet pipes of respectively engine 11 waste gas after burning being discharged 14, of engine 11 connect this two outlet pipe 14 can be in order to the delivery line 15 of deriving waste gas, the electronic control unit 16 (being the familiar ECU of industry) of a Control Engine 11 starts, an and Cat Catalytic Converter 17 that is fixed in delivery line 15 stage casings.Wherein, this electronic control unit 16 more may command two to be arranged at this two suction tude 13 respectively terminal and near the nozzle 161 of these engines 11.

For cooperating world trend, various countries all strictly regulate the waste gas emission standard of the traffic tool, each dealer all endeavours the product that research and development meet relevant emission standards under this standard, wherein, part dealer is chosen in delivery line 15 places and installs secondary air ingress pipe 18 additional, the air of a part by air-strainer 12 is imported in this delivery line 15 burn once more with waste gas, therefore, when the Cat Catalytic Converter 17 in the waste gas arrival delivery line 15, can under catalyst is assisted, be converted to the lower material of dustiness and discharge.

By above-mentioned known techniques as can be known, these secondary air ingress pipe 18 inlets are too far away apart from the relief opening 111 of this engine 11, the negative-pressure sucking deficiency that causes vehicle, cause the secondary air deficiency of air, cause the working efficiency of this Cat Catalytic Converter 17 on the low side, and, even damage because the exhaust gas temperature height of these engine 11 dischargings also causes these solenoid valve 162 starts bad.

Consult Fig. 2, other has the dealer of part then is in these outlet pipe 14 middle section position places, more sets up and puts a Lambda sensor (O ₂SENSOR) 19, utilize this two Lambda sensor (O ₂SENSOR) 19 waste gas composition and the content thereof that detect from engine 11, and signal returned to electronic control unit 16, this electronic control unit 16 is just controlled the fuel injection quantity of this two nozzle 161 according to this signal, to meet environmental regulation, reach the purpose of monitoring toxic emission.

From the above, utilizing these Lambda sensor 19 dynamic monitoring waste gas proportion of composing obviously is a more efficient method, but the introducing port of this secondary air ingress pipe 18 is positioned at the place ahead of this Lambda sensor 19, cause the importing of secondary air disturb former in this outlet pipe 14 concentration of waste gas, make this Lambda sensor 19 erroneous judgement waste gas composition and content thereof, it is wrong and air fuel ratio (AFR) numerical value that make this electronic control unit 16 do to make mistake is judged to cause returning message, thereby loses the purpose that this Lambda sensor 19 is set.

Therefore, if can between Lambda sensor 19 and secondary air ingress pipe 18, obtain the configuration balance, except bringing into play the task performance of Cat Catalytic Converter 17 ultimate attainment, at any time monitors oil gas firing situation, believe more and can meet the requirement of environmental regulation now appositely, certainly, present vehicle is gone up formation difference because of air displacement and car body size at engine cylinder number (relevant with relief opening quantity), and it is very urgent especially to develop the polymorphism product that is enough to mate each number of cylinders.

[summary of the invention]

Therefore, purpose of the present invention provides a kind of air fuel ratio of detecting in the waste gas, and imports secondary air simultaneously to help the carrying out of oxidation reaction, can guarantee the device for purifying waste gas from vehicle of Lambda sensor detecting accuracy simultaneously again.

So, a kind of device for purifying waste gas from vehicle of the present invention, the engine of this vehicle has the relief opening of a discharging waste gas, it is characterized in that: this device for purifying waste gas from vehicle comprises a drainage tube, one hollow pipe, one Lambda sensor, an and secondary air ingress pipe, this drainage tube is to link with the relief opening of this engine, this hollow pipe is to be fixedly arranged in this drainage tube and with this drainage tube to be separately, this hollow pipe defines one first space, and match with this drainage tube and to define second space around the first space outer periphery, this Lambda sensor is in order to detect first, the waste gas air fuel ratio in one of them space, two spaces, this secondary air ingress pipe with ambient air import this first, another space wherein, two spaces.

Described device for purifying waste gas from vehicle is characterized in that: this Lambda sensor is arranged on this drainage tube.

Described device for purifying waste gas from vehicle is characterized in that: this secondary air ingress pipe is communicated in the hollow pipe.

Described device for purifying waste gas from vehicle is characterized in that: more comprise positioning piece, this hollow pipe is the internal face that is fixed on this drainage tube by locating piece.

Another device for purifying waste gas from vehicle of the present invention, the engine of this vehicle have the relief opening of a plurality of discharging waste gas that are provided with separately, it is characterized in that:

This device for purifying waste gas from vehicle comprises one first drainage tube, a plurality of second drainage tubes, one first hollow pipe, one Lambda sensor, and a plurality of secondary air ingress pipes, this first drainage tube is a wherein relief opening that is linked to this engine, these a plurality of second drainage tubes then are linked to all the other each relief openings of this engine respectively, this first hollow pipe is to be fixedly arranged in first drainage tube and with this first drainage tube to be separately, this first hollow pipe defines one first space, and match with this first drainage tube and to define second space that is looped around the first space outer periphery, this Lambda sensor is arranged on this first drainage tube, and these a plurality of secondary air ingress pipes are communicated with this first hollow pipe and a plurality of second drainage tube respectively.

This device for purifying waste gas from vehicle comprises one first drainage tube, a plurality of second drainage tubes, one first hollow pipe, a plurality of second hollow pipes, a plurality of Lambda sensors, and a plurality of secondary air ingress pipes, this first drainage tube is a wherein relief opening that is linked to this engine, these a plurality of second drainage tubes then are linked to all the other each relief openings of this engine respectively, this first with a plurality of second hollow pipes be to be fixedly arranged on respectively in first drainage tube and a plurality of second drainage tube, and be separately with this first drainage tube and a plurality of second drainage tube respectively, this first hollow pipe and a plurality of second hollow pipe define one first space respectively in this first drainage tube and a plurality of second drainage tube, and match with this first drainage tube and a plurality of second drainage tube and to define second space that is looped around the first space outer periphery, this Lambda sensor is arranged on this first drainage tube and a plurality of second drainage tube, and these a plurality of secondary air ingress pipes are communicated with this first hollow pipe and a plurality of second hollow pipe respectively.

Above-mentioned device for purifying waste gas from vehicle is characterized in that: this secondary air ingress pipe is the relief opening of more contiguous engine with respect to Lambda sensor.

Above-mentioned device for purifying waste gas from vehicle is characterized in that: more comprise an one-way valve, this one-way valve is to be communicated in this secondary air ingress pipe.

The effect of device for purifying waste gas from vehicle of the present invention is, the air fuel ratio that sees through in the detecting waste gas is come the Control Engine combustion case, effectively the control discharging waste gas is that prerequisite is provided with the secondary air ingress pipe not influence Lambda sensor detecting accuracy simultaneously, makes secondary air not disturb Lambda sensor.

[description of drawings]

Fig. 1 is a kind of configuration schematic diagram of venting gas appliance of known car engine;

Fig. 2 is the configuration schematic diagram of the venting gas appliance of another kind of known car engine;

Fig. 3 is a user mode schematic representation, illustrates that the first preferable enforcement collocation of one of device for purifying waste gas from vehicle of the present invention is used in the situation in the simple engine;

Fig. 4 is a partial schematic sectional view of this preferred embodiment, illustrates to be installed with a pipe in the drainage tube;

Fig. 5 is another partial schematic sectional view of this preferred embodiment;

Fig. 6 is a user mode schematic representation, and the arrange in pairs or groups situation of a twin-tub engine of one of device for purifying waste gas from vehicle of the present invention second preferred embodiment is described;

Fig. 7 is a partial schematic sectional view, illustrates that this second preferred embodiment comprises the enforcement aspect of two drainage tubes as exhaust gas routing: and

Fig. 8 is a partial schematic sectional view, illustrates that the 3rd preferred embodiment of one of device for purifying waste gas from vehicle of the present invention comprises the enforcement state of two drainage tubes as exhaust gas routing.

[embodiment]

About addressing other technologies content, characteristics and effect before the present invention, in the following detailed description that cooperates with reference to two graphic preferred embodiments, can clearly understand.

Be noted that before explanation that in following structure description similar elements is to name with identical numbering.

Consult Fig. 3, first preferred embodiment of device for purifying waste gas from vehicle 3 of the present invention is to be used for vehicles such as locomotive, all-terrain vehicle (for ease of explanation, do not draw this vehicle detailed structure among the figure), this vehicle has an engine 21, a Cat Catalytic Converter 23, and an electronic control unit 24 (being the known ECU of industry).This engine 21 comprises that a body 211, introduces the suction port 213, of this body 211 is derived air by this body 211 relief opening 214 with ambient air, and one regulated and control by electronic control unit 24 and fuel oil sprayed into the nozzle 215 of these body 211 internal combustion.

Cooperate Fig. 4 and Fig. 5, this device for purifying waste gas from vehicle 3 comprises: a drainage tube 31, a hollow pipe 32, a Lambda sensor 34, a secondary air ingress pipe 35, positioning piece 36, and an one-way valve 37.

This drainage tube 31 is linked to the relief opening 214 of engine 21, and has a ring-type tube wall 310.This hollow pipe 32 is to be fixedly arranged in this drainage tube 31, and has one first space 38, and more matches with this drainage tube 31 and define one second space 39, and wherein, this second space 39 is the outer periphery that are looped around first space 38.This Cat Catalytic Converter 23 is to be installed on the drainage tube 31, can carry out catalysis to waste gas.

This Lambda sensor 34 electrically connects with this electronic control unit 24, and places but not exclusively penetrate the tube wall 310 of drainage tube 31.This Lambda sensor 34 has one in second space 39 and do not touch the measuring end of this hollow pipe 32, be used to detect the waste gas air fuel ratio (AFR) that flows through second space 39, and send the air fuel ratio message to this electronic control unit 24, this electronic control unit 24 of confession can be adjusted fuel oil, the AIR Proportional in the oil gas at any time, this can use voluntarily for haveing the knack of this skill personage, and its correlation technique and application mode are not given unnecessary details in addition.

This secondary air ingress pipe 35 is to wear this tube wall 310 and be connected with this first space 38 equally, but do not run through this drainage tube 31 and hollow pipe 32, ambient air after filtering can be imported in this first space 38, this secondary air ingress pipe 35 is with respect to the relief opening 214 of more contiguous this engine 21 of Lambda sensor 34.

This locating piece 36 is annular metals, has a plurality of radial extension pieces that outwards scatter 361 at interval that are.These locating piece 36 covers are fixed in edge outside this hollow pipe 32, by extension piece 361 these hollow pipe 32 weldering knots are positioned to one of drainage tube 31

internal face

311, and 311 of walls form at interval within this hollow pipe 32 and the drainage tube 31, waste gas can flow from the space of 361 of wantonly two extension pieces and pass through this locating piece 36, so this locating piece 36 can't be blocked flowing of waste gas.

This one-way valve 37 is connected with this secondary air ingress pipe 35, can guide ambient air and enter in this this hollow pipe 32 via this secondary air ingress pipe 35, also can prevent that the waste gas in this hollow pipe 32 from being released by this secondary air ingress pipe 35 simultaneously.

Behind vehicle launch, this engine 21 launches running immediately, under the precision control of electronic control unit 24, this nozzle 215 injects engine 21 with fuel oil according to certain proportion, the air-strainer (not shown) is introduced air and is mixed into oil gas via suction port 213 importings with fuel oil by the external world simultaneously, this oil gas enters the piston (not shown) of this engine 21 internal combustion blast back with drive engine 21, and the waste gas behind the combustion explosion is left by relief opening 214 subsequently and divides a word with a hyphen at the end of a line toward this drainage tube 31.

Separate down by this hollow pipe 32, the a part of waste gas that flows in the drainage tube 31 enters first space 38, and converge with air that this secondary air ingress pipe 35 is imported, the waste gas of another part then is to enter second space 39, when waste gas by this Lambda sensor 34 the position is set the time, this Lambda sensor 34 is recorded the air fuel ratio of waste gas instantly, and sends the air fuel ratio message to this electronic control unit 24, whether needs to change fuel injection quantity by these electronic control unit 24 computings.

The optimal values that present embodiment is set AFR is 14.7 (being equivalent to CO content is 0.6 ~ 0.8%), if CO content is greater than 0.8%, this electronic control unit 24 must reduce the fuel injection quantity of nozzle 215, otherwise, if CO content is less than 0.6%, this electronic control unit 24 just improves the fuel injection quantity of nozzle 215.

Enter part waste gas in first space 38 leave behind the hollow pipe 32 just can with the waste gas intersection by second space 39, and continue along drainage tube 31 toward this Cat Catalytic Converter 23 of the mobile arrival of direction away from relief opening 214, under the catalysis of Cat Catalytic Converter 23, and via the oxidation reaction of secondary air, empty dirty molecule in the waste gas is converted to lower hydrocarbon of contaminativity (HC) and carbon monoxide (CO), discharges (not shown) by the terminal of outlet pipe at last.

The present invention adds the hollow pipe 32 of length than drainage tube 31 weak points in drainage tube 31, utilize hollow pipe 32 and drainage tube 31 to cooperatively interact to define irrelevant disturb first, two

spaces

38,39, and make these secondary air ingress pipe 35 direct air flow to first space 38 mixing with waste gas, as for another part waste gas that does not enter first space 38 then is to change second space 39 over to detected by Lambda sensor 34, see through hollow pipe 32 and in this drainage tube 31, mark off first, two

spaces

38,39, make the obstruct that secondary air ingress pipe 35 and Lambda sensor 34 form on the working spaces.

The obstruct of working space produces very important influence for the detecting behavior of this Lambda sensor 34, main cause is that the sensitivity of this Lambda sensor 34 is high, if fail and clearly to separate waste gas and secondary air, these Lambda sensor 34 measured numerical value will be subjected to secondary air and disturb, and can't detect the actual mixing ratio value in the waste gas really.

Consult Fig. 6 and Fig. 7, the present invention's second preferred embodiment almost is equal to previous embodiment, difference only is that present embodiment is applicable in the multi-cylinder vehicle, present embodiment is to be the example explanation with the twin cylinder, the engine 21 that is to say this vehicle has two suction ports 213 and two relief openings 214,214 ', but is not restriction with the twin cylinder during actual enforcement.

This device for purifying waste gas from vehicle 3 comprises two drainage tubes 31 ', 31 corresponding to relief opening 214,214 ' number ", two secondary air ingress pipes 35,35 ', and two one-way valves 37,37 ', but only need a Lambda sensor 34.Wherein one are first drainage tube 31 ' of corresponding relief opening 214 (being arranged in the drainage tube 31 ' of the left of Fig. 6), and another person is second drainage tube 31 of corresponding relief opening 214 ' then ".Wherein, this secondary air ingress pipe 35 is first spaces 38 that air imported first drainage tube 31 ', and another secondary air ingress pipe 35 ' is then guided ambient air and entered this second drainage tube 31 " in.This two one-way valve 37,37 ' is connected with these two secondary air ingress pipes 35,35 ' respectively, can guide ambient air and enter this first hollow pipe 32 ' and second drainage tube 31 via this secondary air ingress pipe 35,35 ' " in, also can prevent simultaneously that waste gas is unlikely is released by these two secondary air ingress pipes 35,35 '.

As arrow direction among Fig. 7 is the direction of travel of waste gas after relief opening 314,314 ' flows out, this Lambda sensor 34 is arranged on first drainage tube 31 ', and 34 of this Lambda sensors are the waste gas air fuel ratios in detecting second space 39, in addition, this secondary air ingress pipe 35 is than the more close relief opening 214 of this Lambda sensor 34.

Consult Fig. 8, the 3rd embodiment for the present invention, the 3rd preferable enforcement profit almost is equal to this second embodiment, difference only is first drainage tube 31 ' and second drainage tube 31 in the present embodiment " have the first hollow pipe 32 ' and the second hollow pipe 32 respectively ", two Lambda sensors 34,34 ', two secondary air ingress pipe 35,35 ', and two one-

way valves

37,37 '.Wherein, this secondary air ingress pipe 35,35 ' is that secondary air is imported the first hollow pipe 32 ' and the second hollow pipe 32 " first space 38,38 ' in.This two one-way valve 37,37 ' is connected with these two secondary air ingress pipes 35,35 ' respectively, can guide ambient air and enter this first hollow pipe 32 ' and the second hollow pipe 32 via this secondary air ingress pipe 35,35 ' " first space 38,38 ' in, also can prevent that waste gas is unlikely is simultaneously released by these two secondary

air ingress pipes

35,35 '.This Lambda sensor 34,34 ' is arranged at first drainage tube 31 ' and second drainage tube 31 " on; and this Lambda sensor 34,34 ' then is the waste gas air fuel ratio in detecting second space 39,39 '; in addition, and this secondary air ingress pipe 35,35 ' relief opening than this Lambda sensor 34,34 ' the more close engine.

Conclude above-mentioned, the present invention is in conjunction with secondary air ingress pipe 35 and Lambda sensor 34, not only can import outside secondary air carries out with the oxidation that helps waste gas, can also be at any time with the air fuel ratio in the Lambda sensor 34 monitoring waste gas, but the importing because of secondary air does not influence the correctness that air fuel ratio is measured, use one-way valve 37 to prevent that waste gas from releasing simultaneously in secondary air ingress pipe 35, having improved the oxidation reaction of waste gas carries out, the relief opening of secondary air ingress pipe 35 than the more close engine 21 of this Lambda sensor 34 further is set, so that sufficient secondary air to be provided, and the present invention more can cooperate the number of cylinders of engine 21 slightly to adjust, to meet the demand that sets of various vehicles appositely, reach the present invention's purpose really.

The above person only is the present invention's three preferred embodiments, when the scope that can not limit the invention process with this, promptly changes and modification according to the simple equivalent that the present invention did generally, all should still belong in protection scope of the present invention.

Claims

1. device for purifying waste gas from vehicle, the engine of this vehicle has the relief opening of a discharging waste gas, it is characterized in that:

This device for purifying waste gas from vehicle comprises a drainage tube, one hollow pipe, one Lambda sensor, an and secondary air ingress pipe, this drainage tube is to link with the relief opening of this engine, this hollow pipe is to be fixedly arranged in this drainage tube and with this drainage tube to be separately, this hollow pipe defines one first space, and match with this drainage tube and to define second space around the first space outer periphery, this Lambda sensor is in order to detect first, the waste gas air fuel ratio in one of them space, two spaces, this secondary air ingress pipe with ambient air import this first, another space wherein, two spaces.

2. according to the described device for purifying waste gas from vehicle of claim 1, it is characterized in that: this Lambda sensor is arranged on this drainage tube, and this secondary air ingress pipe is communicated in the hollow pipe.

3. according to the described device for purifying waste gas from vehicle of claim 1, it is characterized in that: more comprise positioning piece, this hollow pipe is the internal face that is fixed on this drainage tube by locating piece.

4. device for purifying waste gas from vehicle, the engine of this vehicle have the relief openings of a plurality of discharging waste gas that are provided with separately, it is characterized in that:

5. device for purifying waste gas from vehicle, the engine of this vehicle have the relief openings of a plurality of discharging waste gas that are provided with separately, it is characterized in that:

6. according to claim 1,4 or 5 described device for purifying waste gas from vehicle, it is characterized in that: this secondary air ingress pipe is the relief opening of more contiguous engine with respect to Lambda sensor.

7. according to claim 1,4 or 5 described device for purifying waste gas from vehicle, it is characterized in that: more comprise an one-way valve, this one-way valve is to be communicated in this secondary air ingress pipe.