CN2918767Y

CN2918767Y - Natural gas single fuel supercharging engine

Info

Publication number: CN2918767Y
Application number: CNU2005200365581U
Authority: CN
Inventors: 万义军; 杨志勇; 程辉
Original assignee: DONGFENG NANCHONG AUTOMOBILE Co Ltd
Current assignee: DONGFENG NANCHONG AUTOMOBILE Co Ltd
Priority date: 2005-12-15
Filing date: 2005-12-15
Publication date: 2007-07-04
Anticipated expiration: 2015-12-15

Abstract

The utility model relates to a natural gas single-fuel supercharged engine, comprising a gas supply system, an air supply system and other devices. The gas supply system comprises the compressed natural gas stored in the automobile carried steel bottle. An air outlet port of the steel bottle is connected with a group of tandem pressure reducers; the last step of the pressure reducers is connected with a partial-flow joint (1) which has two outlet port ends with different flow quantities, one of the two outlet port ends is connected with a valve core (7) through a natural gas control valve (3) controlled by a stepping motor. The air supply system comprises an air inlet device with an air filter, an exhaust-gas turbocharging system and a mixing device (2). The air inlet ports of the mixing device (2) are respectively connected with the gas supply system and the air supply system; the outlet end of the mixing device (2) is connected with the air inlet end of the exhaust-gas charging turbo. The engine torque is slightly increased compared with the same model engine; the fuel cost is reduced by 30 to 40%.

Description

Supercharging engine with gas as single fuel

Technical field:

The utility model relates generally to a kind of explosive motor, particularly a kind of motor that uses fuelled with natural gas.

Background technique:

Common explosive motor uses fuel oil such as gasoline, diesel oil etc.China is oil-poor but abundant natural gas resource is arranged, so there is a lot of research steerings how to utilize natural gas resource, the example of making motor fuel with rock gas is too numerous to enumerate.General exploitation dual-fuel vehicular engine is more, but the physico-chemical property of rock gas and other fuel has very big difference, and is well more a lot of than the antiknock quality of gasoline as rock gas.The motor of same structure is wanted simultaneous adaptation two specific characters fuel inequality, and difficulty is bigger.So use the motor of fuelled with natural gas more can improve the thermal efficiency of rock gas purely.In known technology, go up the vehicle diesel engine and the part petrol engine of power in for example, all used exhaust turbine pressuring technology, utilize pressurized machine to increase air inlet end of a period pressure, to increase the circulation air inflow, be the important measures that improve the engine power characteristic.Air inlet by the pressurization of waste gas charging turbine in the known technology generally directly enters the firing chamber, comprises that with fuel rock gas or oil mix in cylinder.When using rock gas, prior art solutions generally is with electric injection device combustion gas to be sent in the cylinder, because the spray orifice of electric injection device is very little, stops up spray orifice easily without the rock gas that cleans, so often must install filtrating equipment additional again, and the electric injection device cost is higher.Adopt that above-mentioned that air inlet and rock gas are sent into the example of cylinder respectively is not within minority, as the Chinese invention patent application, application number CN200510023438.2, name is called " a kind of natural gas vehicle by double fuels ", device for a kind of can oil firing the motor of burning gas again, when using rock gas, combustion gas that enters from steel cylinder and the air fully mixed combustion in engine cylinder that enters from blower fan.CN99221501.3, name is called " automobile double fuel supply conversion equipment ", mentions in the file and the combustion gas vaporizer is installed on the air intlet of former car upper body mixing air and combustion gas in Carburetor.

By known technology as can be known, no matter be pure natural fuel or use dual-fuel diesel engine or petrol engine, its mixed gas mode has multiple, and its pros and cons also are different.

Technology contents:

The purpose of this utility model is to provide a kind of can overcome the known technology shortcoming, saves cost, reliability height, natural gas engine that practicability is stronger.

For achieving the above object, scheme of the present utility model is: a mixing arrangement is set, and the suction port of mixing arrangement joins with gas supply system and air supply system respectively, and the inlet end of the outlet end of mixing arrangement and waste gas charging turbine joins.

Adopt such scheme, before mixing arrangement is arranged on charging turbine, again by sending into ignition in the cylinder again after the supercharging of waste gas charging turbine, promptly avoided a lot of shortcomings of known technology, thereby realized the purpose of this utility model after rock gas and air mixed in mixing arrangement.

Below in conjunction with diagram and embodiment's more detailed description scheme of the present utility model, and other technical characteristics.

Description of drawings:

Fig. 1 is the mixing arrangement of supercharging engine with gas as single fuel and the erection drawing of rock gas control valve;

Fig. 2 is the parts drawing that mixes body among Fig. 1;

Fig. 3 is the parts drawing of spool among Fig. 1.

Embodiment:

The natural gas engine of this programme design, it is a kind of single-fuel engine, described motor comprises a gas supply system and air supply system and ignition mechanism and other device, described gas supply system comprises the steel cylinder of the contain compressed natural gas that automobile carries, the air outlet of steel cylinder joins with one group of decompressor that is connected in series by pipeline, the afterbody of decompressor and a tap 1 join, tap 1 has two outlet end of different flow, an inlet direct and mixer 2 joins, and another is joined by the rock gas control valve 3 of step motor control and another inlet of mixer 2 by a spool.Described air supply system comprises the air inlet system of being made up of air-strainer etc., be provided with the exhaust gas turbocharge device, these also are several important device of the motor indispensability of a known technology, and mixing arrangement related in the scheme promptly links to each other with said apparatus respectively.

Mixing arrangement 2 as shown in Figure 1 comprises that is mixed a body 4, mixing body 4 is a tubular element, circumferential surface is provided with one group of rock gas air input joint, be generally symmetrical two, present embodiment is joint 5 and 6, the endoporus that mixes body 4 is combined with a tubular mixer core 7, and an end 8 that mixes the body endoporus joins with the outlet of air feeder, and the other end 9 joins with the suction port of waste gas charging turbine.

Mixing body 4 as shown in Figure 2 is a thin-wall tubular element, and its diameter is generally 1 with the ratio of pipe shaft length: 0.8-1.5, and its endoporus bottom is provided with step hole 10, and for mixer core 7 location, the top in hole has one section to cool down 11, is convenient to assemble mixer core 7.Present embodiment is 140 horsepowers a motor, and the diameter of its mixer is 85mm, and pipe shaft is long to be 76mm, and diameter of bore is φ 40.5mm.

Have on the circumference of mixer core 7 as shown in Figure 3 that a ring annular groove 12 communicates with the endoporus of air input joint 5,6, the bottom of groove 12 has one group of equally distributed through hole 13, the diameter of through hole 13 is between 2.5mm-4mm.

The tube wall 14 of mixer core 7 is a variable cross section, and endoporus is formed the opposite frustum of both direction 15,16.This mainly is the speed of air stream and pressure to be become more can mix with rock gas fully.

The connecting tube of this device all uses and flexibly connects, and general connecting tube is a pneumatic hose 17.Because pneumatic hose has certain rigid, therefore also guaranteed the installation and the location of mixer 2 and rock gas control valve 3.

The gas supply system of this programme to storing in the compressed natural gas decompress(ion) in the steel cylinder, is provided with solenoid valve by one group of decompressor that is connected in series as previously mentioned in the decompressor, form the switch between steel cylinder air outlet and the decompressor.As previously mentioned, the decompressor of afterbody and a rock gas control valve 3 join, and the spool 18 of rock gas control valve 3 forms the rock gas control valve by step motor control, stepper motor carries out ECU control by airborne computer, and described airborne computer is made up of microprocessor.ECU is an electronic control unit, English full name (Electronic Control Unit), when control principle comprises each operating mode the optimum state of gathering motor by experiment, be installed in the inlet manifold absolute pressure transducer on the cylinder suction tude, be installed in the intake air temperature sensor of suction tude, each parameter such as engine water temperature sensor that is installed in water outlet is set up database, during engine operation, again according to the inlet manifold absolute pressure transducer, intake air temperature sensor, the data of engine water temperature sensor, carry out simulation analysis and contrast by control software, find out the only control valve parameter under this operating mode, and the output Control Parameter is given stepper motor, the air demand of control rock gas makes the ratio of air/combustion gas mixing gas reach theoretical ratio.

Rock gas control valve as shown in the figure is made up of stepper motor 19, valve body 20, spool 18, moves up and down spool by stepper motor, changes the cross-section area of rock gas circulation, thus the air inflow of control rock gas.

After the supercharging of natural gas engine mixed gas enters cylinder, by electronic control ignition system point fire burns, described electronic control ignition system is by speed probe, cooling-water temperature sensor, absolute pressure transducer and a computer ignition controler ECU entrance point join, computer output terminal and a high-tension coil join, and described high-tension coil links to each other with spark plug by a high voltage wire bag.

The working principle of described computer ignition controler comprises ECU unit collection speed probe, cooling-water temperature sensor, igniting such as absolute pressure transducer initial data, after handling by analysis, the fire signal of the best is passed through the charging/outage of the low-voltage circuit winding of amplification circuit control coil, the high pressure winding of spark coil produces instantaneous high pressure, thereby realizes accurately igniting by spark plug.

The supercharging engine with gas as single fuel working principle of this programme is as follows: the air inlet end of mixer links to each other with air-strainer, the other end of mixer directly links to each other with the gas compressor inlet of waste gas charging turbine, the caliber of its connection is all bigger, so can enter enough air, after entering the natural gas via decompression of mixer, reduce pressure stable 0.2Kpa in mixer and air mixing from 20Mpa, the approach that rock gas enters mixer has two, article one, link to each other with mixer joint 5 through pipeline from tap 1, only allow into small amounts of natural gas, form sub load; Another pipeline and joint 6 by 3 controls of rock gas control valve joins, and forms the fuel supply that produces big power.When the High Temperature High Pressure exhaust flow that comes out from engine exhaust is flowed through the turbine case of pressurized machine, impulse turbine, make the turbine shaft rotation, also rotate with the coaxial mounted compressor impeller of turbine shaft, air after the air-strainer filtering is sucked compressor casing by negative pressure simultaneously, but the air of this moment fully has been mixed into mixed gas with rock gas in entering the process of gas compressor, the mixed gas that the compressor impeller of rotation will enter compressor casing gets rid of to air outlet, impeller edge, the flow velocity and the pressure of mixed gas are raise, mixed gas after the supercharging enters cylinder by inlet manifold, selects the best opportunity ignition by the ignition system of computer control.

The type that this supercharging engine with gas as single fuel is suitable for is a 80-260 horsepower, is particularly suitable for being installed on city bus, touring car and other vehicle of environmental requirement strictness.Compare with the diesel engine or the petrol engine of similar type, this type cost is identical with the diesel engine of similar type, and the moment of torsion of this motor slightly improves, and therefore the expense decline 30-40% of fuel is a kind of very promising motor.

Claims

1, a kind of supercharging engine with gas as single fuel, comprise a gas supply system and air supply system and other device, described gas supply system comprises that compressed natural gas stores in the steel cylinder that automobile carries, the air outlet of steel cylinder joins with one group of decompressor that is connected in series by pipeline, the afterbody of decompressor and a tap (1) join, tap (1) has two outlet end of different flow, one of them and a spool (7) are joined by the rock gas control valve (3) of step motor control, described air supply system comprises the air inlet system of being made up of air-strainer, be provided with the exhaust gas turbocharge device, it is characterized in that: a mixing arrangement (2) is set, the suction port of mixing arrangement (2) joins with gas supply system and air supply system respectively, and the outlet end of mixing arrangement (2) and the inlet end of waste gas charging turbine join.

2, a kind of supercharging engine with gas as single fuel according to claim 1, it is characterized in that: described mixing arrangement comprises that is mixed a body (4), mixing body (4) is a tubular element, the garden side face is provided with one group of rock gas air input joint, the endoporus that mixes body is combined with a tubular mixer core (7), an end (8) that mixes body (4) endoporus joins with the outlet of air feeder, and the other end (9) joins with the suction port of waste gas charging turbine.

3, a kind of supercharging engine with gas as single fuel according to claim 2 is characterized in that: mixing body is a thin-wall tubular element, and its diameter is generally 1 with the ratio of pipe shaft length: 0.8-1.5.

4, a kind of supercharging engine with gas as single fuel according to claim 2 is characterized in that: the endoporus bottom of mixing body (4) is provided with a step hole (10), and one section cool down (11) are arranged at the top in hole.

5, a kind of supercharging engine with gas as single fuel according to claim 2 is characterized in that: have on the circumference of mixer core (7) that a ring annular groove (12) communicates with the endoporus of air input joint (5) and (6), the bottom of groove (12) has one group of equally distributed through hole (13).

6, a kind of supercharging engine with gas as single fuel according to claim 5 is characterized in that: the tube wall (14) of mixer core (7) is a variable cross section, and endoporus is formed the opposite frustum of both direction (15), (16).

7, a kind of supercharging engine with gas as single fuel according to claim 1, it is characterized in that: gas supply system is reduced pressure to the compressed natural gas of storing in the steel cylinder by the decompressor of one group of serial connection, described one group of decompressor is provided with solenoid valve, and decompressor afterbody and spool are joined by the rock gas control valve (3) of step motor control.

8, a kind of supercharging engine with gas as single fuel according to claim 7 is characterized in that: the stepper motor of rock gas control valve (3) carries out ECU control by airborne computer, and described airborne computer is made up of microprocessor.

9, a kind of supercharging engine with gas as single fuel according to claim 8, it is characterized in that: when the ECU control principle comprises each operating mode the optimum state of gathering motor by experiment, the inlet manifold absolute pressure transducer, intake air temperature sensor, each parameter such as engine water temperature sensor is set up database, during engine operation, again according to the inlet manifold absolute pressure transducer, intake air temperature sensor, the data of engine water temperature sensor, carry out simulation analysis and contrast by control software, find out the only control valve parameter under this operating mode, and export Control Parameter and give stepper motor, the air demand of control rock gas makes the ratio of air/combustion gas mixing gas reach theoretical ratio.