CN102635429B - Device and method for carrying out closed-loop control on discharge of internal combustion engine by using hydrogen and oxygen - Google Patents
Device and method for carrying out closed-loop control on discharge of internal combustion engine by using hydrogen and oxygen Download PDFInfo
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Abstract
The invention relates to a device and a method for carrying out closed-loop control on discharge of an internal combustion engine by using hydrogen and oxygen, belonging to the field of discharge control of internal combustion engines. According to a system of the device, on the basis of keeping all main bodies and control systems of the original engine, a set of tail gas catalytic conversion system, a set of hydrogen/oxygen injection system capable of realizing the closed-loop control and a set of vehicle-mounted hydrogen and oxygen preparing and storing system are additionally arranged. The device mainly comprises a hydrogen nozzle, an oxygen nozzle, a reduction catalytic device, an oxidation catalytic device, an NOx sensor, a CO sensor, a hydrogen/oxygen electronic control unit which are arranged on an exhaust pipe of the internal combustion engine. The electronic control unit is used for determining the basic injection amounts of the hydrogen and the oxygen injected into the reduction catalytic device and the oxidization catalytic device according to revolving speed and inlet gas flow, and adjusting the corrected injection pulse widths of the hydrogen and the oxygen according to the NOx concentration behind the reduction catalytic device and the CO concentration behind the oxidation catalytic device, so that harmful discharge produced when the internal combustion engine runs is treated and wastes of the hydrogen and the oxygen are reduced.
Description
Technical field
The invention provides a kind of device and method that utilizes hydrogen, oxygen closed loop control engine exhaust, particular content relates to a kind of device and method that utilizes hydrogen, oxygen and corresponding catalyst converter to transform engine exhaust, belongs to the engine exhaust control field.
Background technique
Traditional internal-combustion engine ternary catalyzing unit only is under the chemically correct fuel condition and just can reaches maximum transformation efficiency in fuel-air Mixture.Yet, for gasoline engine and diesel engine, due to mixed gas in cylinder in the lean-burn state, so the HC, the CO that produce when traditional ternary catalyzing unit is difficult to internal combustion engine operation and the abundant catalyzed conversion of NOx.Simultaneously, utilize the apparatus cost costliness of the technical finesse NOx such as SCR and DPF and particulate matter.
Published patent of invention " a kind of engine exhaust control gear and method based on vehicle-mounted hydrogen production oxygen machine " (publication number: CN102155278A) proposed a kind of vehicle-mounted hydrogen production mechanism of utilizing and got hydrogen and oxygen, and utilized hydrogen and oxygen reducing NOx or oxidation HC, CO and granular material discharged device and method respectively.But, in published patent of invention, the emitted dose of hydrogen and oxygen adopts open-loop control method, and this makes system be difficult to according to the actual changing effect rapid adjustment hydrogen of HC, CO, NOx and particulate matter and the injection proportion of oxygen, thereby is difficult to reach good control effect.
Summary of the invention
Be not suitable for diesel engine and gasoline engine for current three-way catalytic converter, and the problem that does not adopt closed loop control when existing employing hydrogen and oxygen catalyzed conversion HC, CO, NOx and particulate matter, the invention provides a kind of device and method that utilizes hydrogen, oxygen closed loop control engine exhaust.
The present invention has adopted following technological scheme, and a kind of device of hydrogen, oxygen closed loop control engine exhaust that utilizes in this invention comprises internal-combustion engine 13 and internal-combustion engine vent-pipe 10.It is characterized in that having increased a set of tail gas conversion system, a set of oxyhydrogen gas ejecting system and a set of on-board hydrogen, oxygen are produced, stocking system, comprising: oxyhydrogen machine 1 processed, hydrogen storage tank 2, oxygen storage tank 3, NOx sensor 4, CO sensor 5, hydrogen nozzle 6, oxygen jet 7, oxidation catalyzer 8, reduction catalyst converter 9, exhaust gas temperature sensor 11 and electronic control unit 12.The hydrogen that vehicle-mounted hydrogen production oxygen machine 1 will make by brine electrolysis when motor moves and oxygen are stored in hydrogen storage tank 2 and oxygen storage tank 3 by pipeline respectively; Hydrogen storage tank 2 is connected with oxygen jet 7 with hydrogen nozzle 6 by pipeline respectively with oxygen storage tank 3; Hydrogen nozzle 6 and oxygen jet 7 are separately fixed on reduction catalyst converter 9 and oxidation catalyzer 8; Exhaust gas temperature sensor 11, reduction catalyst converter 9 and oxidation catalyzer 8 are separately fixed on exhaust manifold for internal combustion engine.
A kind of device that utilizes hydrogen, oxygen closed loop control engine exhaust, its method of operation is as follows:
A kind of device that utilizes hydrogen, oxygen closed loop control engine exhaust is when operation, and oxyhydrogen machine 1 processed is stored in the hydrogen and the oxygen that make in hydrogen storage tank 2 and oxygen storage tank 3.The Tail Pipe Temperature signal c that electronic control unit 12 obtains from exhaust gas temperature sensor 11, and judge according to delivery temperature whether hydrogen and oxygen jet are opened.When Tail Pipe Temperature is about 250 ℃ lower than the catalyzer initiation temperature, catalyzer is difficult to fully motor exhaust catalyzed conversion under the effect of hydrogen and oxygen, so now electronic control unit 12 sends control signal d, g hydrogen nozzle 6 and oxygen jet 7 are closed.When Tail Pipe Temperature is about 250 ℃ higher than the catalyzer initiation temperature, electronic control unit 12 sends control signal d, g is opened hydrogen nozzle 6 and oxygen jet 7, and according to tach signal a, air flow rate signal b, NOx sensor signal e and CO sensor signal f calculate different rotating speeds, the basic emitted dose of hydrogen and oxygen and correction emitted dose under load and excess air coefficient, and the opening and closing of control hydrogen nozzle 6 and oxygen jet 7, make HC, CO and particulate matter are oxidized by oxygen into water and carbon dioxide in oxidation catalyzer 8, and make NOx be reduced into the nitrogen G&W in reduction catalyst converter 9.
Every circulation actual ejection pulsewidth of the hydrogen that electronic control unit 12 is controlled and oxygen jet is the basic injection pulse width separately and revise the injection pulse width addition and obtain by it respectively.
The calculating of hydrogen and the basic injection pulse width of oxygen: electronic control unit 12 is according to tach signal a and air flow rate signal b and according to T
H2, b=15m
a/ (ρ
a* V
d* N) [formula 1] and t
O2, b=9.75m
a/ (ρ
a* V
d* N) [formula 2] calculates the basic injection pulse width of hydrogen and oxygen.In formula 1 and formula 2, t
H2, bWith t
O2, bBe respectively the basic injection pulse width ms of hydrogen and oxygen, m
aFor the Air Mass Flow Signal obtained from air flow rate signal c, ρ
aFor air density, V
dFor engine swept volume, N is the internal-combustion engine rotational speed obtained from tach signal b.When engine load strengthens, oxyhydrogen gas electronic control unit 16 can strengthen the injection pulse width of hydrogen and oxygen automatically according to the result of utilizing formula 1 and formula 2 to calculate, make more hydrogen and oxygen in reduction catalyst converter 8 and oxidation catalyzer 9, HC, CO, NOx and particulate matter fully are converted into to water, carbon dioxide and nitrogen.
The calculating of hydrogen and oxygen correction injection pulse width: electronic control unit 12 is determined respectively the correction injection pulse width signal of hydrogen and oxygen according to detected NOx sensor signal e and CO sensor signal f, when the NOx concentration of NOx sensor signal e that electronic control unit 12 detects indication after reduction catalyst converter 9 catalysis during higher than 2ppm, electronic control unit 12 extends the opening time of hydrogen nozzle 6 by sending hydrogen Jet control signal d, make more hydrogen can enter into reduction catalyst converter 9, with effective reducing NOx emissions; When the NOx concentration of NOx sensor signal e that electronic control unit 12 detects indication after reduction catalyst converter 9 catalysis is less than or equal to 2ppm and is more than or equal to 1ppm, electronic control unit 12 remains unchanged the opening time of hydrogen nozzle 6 by sending hydrogen Jet control signal d, now, reduction catalyst converter 9 can effectively be converted into N2 by NOx; When the NOx concentration of NOx sensor signal e that electronic control unit 12 detects indication after reduction catalyst converter 9 catalysis is less than 1ppm, electronic control unit 12 reduces the opening time of hydrogen nozzle 6 by sending hydrogen Jet control signal d, to avoid too much hydrogen to be injected in reduction catalyst converter 9, thereby reduce the waste to hydrogen; Simultaneously, when the CO concentration of CO sensor signal f that electronic control unit 12 detects indication after oxidation catalyzer 8 catalysis during higher than 2ppm, electronic control unit 12 extends the opening time of oxygen jet 7 by sending oxygen jet control signal g, make more oxygen can enter into oxidation catalyzer 8, with the efficient oxidation CO, HC and granular material discharged; When the CO concentration of CO sensor signal f that electronic control unit 12 detects indication after oxidation catalyzer 8 catalysis is less than or equal to 2ppm and is more than or equal to 1ppm, electronic control unit 12 remains unchanged the opening time of oxygen jet 7 by sending oxygen jet control signal g, now, oxidation catalyzer 8 can effectively be converted into CO by CO, HC and particulate matter
2And water; When the CO concentration of CO sensor signal f that electronic control unit 12 detects indication after oxidation catalyzer 8 catalysis is less than 1ppm, electronic control unit 12 reduces the opening time of oxygen jet 7 by sending oxygen jet control signal g, to avoid too much oxygen to be injected in oxidation catalyzer 8, thereby reduce the waste to oxygen.
The invention has the beneficial effects as follows, high for current processing unit for tail cost, the life-span is short, the problem that the ternary catalyzing unit operating range is narrow, proposition utilizes vehicle-mounted hydrogen production machine preparing hydrogen, oxygen, and the main noxious emission such as HC, CO, NOx and particulate matter that utilizes hydrogen and oxygen to coordinate respectively the mode of reducibility catalyzer and oxidative catalyst to come controlling combustion engine when operation to produce.By the NOx sensor is installed in reducibility catalyst converter rear end, and at oxidative catalyst rear end installation CO sensor, make electronic control unit realize the closed loop control to hydrogen and oxygen lancing amount according to the NOx concentration detected and CO concentration, thereby improved the control accuracy of catalytic conversion system, make the discharges such as NOx, HC, CO and particulate matter can be converted into efficiently nitrogen, water and carbon dioxide, avoided in open-loop control system due to hydrogen and the excessive waste caused of oxygen lancing simultaneously.
The accompanying drawing explanation
Fig. 1 structure of the present invention and fundamental diagram
1 oxyhydrogen machine processed; 2 hydrogen storage tank; 3 oxygen storage tank; The 4NOx sensor; The 5CO sensor; 6 hydrogen nozzles; 7 oxygen jets; 8 oxidation catalyzers; 9 reduction catalyst converters; 10 internal-combustion engine vent-pipes; 11 exhaust gas temperature sensors; 12 electronic control units; 13 internal-combustion engines
A. tach signal; B. air flow rate signal; C. Tail Pipe Temperature signal; D. hydrogen Jet control signal; The e.NOx sensor signal; The f.CO sensor signal; G. oxygen jet control signal
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, this device comprises original internal-combustion engine 13 and internal-combustion engine vent-pipe 10 on automobile.
Exhaust gas temperature sensor 11 is arranged on internal-combustion engine vent-pipe 10 by screw thread, reduction catalyst converter 9 and oxidation catalyzer 8 are arranged on internal-combustion engine vent-pipe 10 by flange respectively, hydrogen nozzle 6 and oxygen jet 7 are threaded connection respectively on internal-combustion engine vent-pipe 10, before hydrogen nozzle 6 is installed on reduction catalyst converter 9, before oxygen jet 7 is installed on oxidation catalyzer 8, NOx sensor and CO sensor are arranged on internal-combustion engine vent-pipe 10 by screw thread respectively, the NOx installation of sensors is after reduction catalyst converter 9, the CO installation of sensors is after oxidation catalyzer 8, hydrogen storage tank 2 is connected with oxygen jet 7 with hydrogen nozzle 6 by the stainless steel pipeline respectively with oxygen storage tank, the hydrogen of oxyhydrogen machine 1 processed is connected with oxygen storage tank with hydrogen storage tank 2 by the stainless steel pipeline respectively with oxygen outlet.
A kind of device method of operation of hydrogen, oxygen closed loop control engine exhaust of utilizing in the present invention is as follows:
A kind of device that utilizes hydrogen, oxygen closed loop control engine exhaust is when operation, and oxyhydrogen machine 1 processed is stored in the hydrogen and the oxygen that make in hydrogen storage tank 2 and oxygen storage tank 3.The Tail Pipe Temperature signal c that electronic control unit 12 obtains from exhaust gas temperature sensor 11, and judge according to delivery temperature whether hydrogen and oxygen jet are opened.When Tail Pipe Temperature is about 250 ℃ lower than the catalyzer initiation temperature, catalyzer is difficult to fully motor exhaust catalyzed conversion under the effect of hydrogen and oxygen, so now electronic control unit 12 sends control signal d, g hydrogen nozzle 6 and oxygen jet 7 are closed.When Tail Pipe Temperature is about 250 ℃ higher than the catalyzer initiation temperature, electronic control unit 12 sends control signal d, g is opened hydrogen nozzle 6 and oxygen jet 7, and according to tach signal a, air flow rate signal b, NOx sensor signal e and CO sensor signal f calculate different rotating speeds, the basic emitted dose of hydrogen and oxygen and correction emitted dose under load and excess air coefficient, and the opening and closing of control hydrogen nozzle 6 and oxygen jet 7, make HC, CO and particulate matter are oxidized by oxygen into water and carbon dioxide in oxidation catalyzer 8, and make NOx be reduced into the nitrogen G&W in reduction catalyst converter 9.
Every circulation actual ejection pulsewidth of the hydrogen that electronic control unit 12 is controlled and oxygen jet is the basic injection pulse width separately and revise the injection pulse width addition and obtain by it respectively.
The calculating of hydrogen and the basic injection pulse width of oxygen: electronic control unit 12 is according to tach signal a and air flow rate signal b and according to t
H2, b=15m
a/ (ρ
a* V
d* N) [formula 1] and t
O2, b=9.75m
a/ (ρ
a* V
d* N) [formula 2] calculates the basic injection pulse width of hydrogen and oxygen.In formula 1 and formula 2, tH2, b and tO2, b is respectively the basic injection pulse width ms of hydrogen and oxygen, m
aFor the Air Mass Flow Signal obtained from air flow rate signal c, ρ a is air density, V
dFor engine swept volume, N is the internal-combustion engine rotational speed obtained from tach signal b.When engine load strengthens, oxyhydrogen gas electronic control unit 16 can strengthen the injection pulse width of hydrogen and oxygen automatically according to the result of utilizing formula 1 and formula 2 to calculate, make more hydrogen and oxygen in reduction catalyst converter 8 and oxidation catalyzer 9, HC, CO, NOx and particulate matter fully are converted into to water, carbon dioxide and nitrogen.
The calculating of hydrogen and oxygen correction injection pulse width: electronic control unit 12 is determined respectively the correction injection pulse width signal of hydrogen and oxygen according to detected NOx sensor signal e and CO sensor signal f, when the NOx concentration of NOx sensor signal e that electronic control unit 12 detects indication after reduction catalyst converter 9 catalysis during higher than 2ppm, electronic control unit 12 extends the opening time of hydrogen nozzle 6 by sending hydrogen Jet control signal d, make more hydrogen can enter into reduction catalyst converter 9, with effective reducing NOx emissions; When the NOx concentration of NOx sensor signal e that electronic control unit 12 detects indication after reduction catalyst converter 9 catalysis is less than or equal to 2ppm and is more than or equal to 1ppm, electronic control unit 12 remains unchanged the opening time of hydrogen nozzle 6 by sending hydrogen Jet control signal d, now, reduction catalyst converter 9 can effectively be converted into N by NOx
2When the NOx concentration of NOx sensor signal e that electronic control unit 12 detects indication after reduction catalyst converter 9 catalysis is less than 1ppm, electronic control unit 12 reduces the opening time of hydrogen nozzle 6 by sending hydrogen Jet control signal d, to avoid too much hydrogen to be injected in reduction catalyst converter 9, thereby reduce the waste to hydrogen; Simultaneously, when the CO concentration of CO sensor signal f that electronic control unit 12 detects indication after oxidation catalyzer 8 catalysis during higher than 2ppm, electronic control unit 12 extends the opening time of oxygen jet 7 by sending oxygen jet control signal g, make more oxygen can enter into oxidation catalyzer 8, with the efficient oxidation CO, HC and granular material discharged; When the CO concentration of CO sensor signal f that electronic control unit 12 detects indication after oxidation catalyzer 8 catalysis is less than or equal to 2ppm and is more than or equal to 1ppm, electronic control unit 12 remains unchanged the opening time of oxygen jet 7 by sending oxygen jet control signal g, now, oxidation catalyzer 8 can effectively be converted into CO by CO, HC and particulate matter
2And water; When the CO concentration of CO sensor signal f that electronic control unit 12 detects indication after oxidation catalyzer 8 catalysis is less than 1ppm, electronic control unit 12 reduces the opening time of oxygen jet 7 by sending oxygen jet control signal g, to avoid too much oxygen to be injected in oxidation catalyzer 8, thereby reduce the waste to oxygen.
Carried out following experiment under the present embodiment operating conditions different at two kinds of internal-combustion engines of gasoline and diesel oil:
Testing motor used is 2.4 liters of high-pressure common rail direct injection diesel engine of in-line four cylinder and in-line four cylinder 1.6L intake port injection petrol engine, and two internal-combustion engines are all transformed according to shown in Fig. 1, and the device that reduces engine exhaust with car preparing hydrogen, oxygen is installed.The diesel engine experiment is commercially available 0# diesel oil with oil, and the petrol engine experiment adopts commercially available 93# gasoline, and hydrogen and oxygen are provided by automobile-used oxyhydrogen machine processed.Use copper-based catalysts in reduction catalyst converter 9 and oxidation catalyst 8.Use Horiba-7100DEGR type discharge instrument to measure under each experiment condition before catalysis and HC, CO after catalysis and NOx discharge, the particulate emission that uses AVL Di-smoke4000 smoke meter to measure before and after diesel catalyst changes.Due to the air outlet flue temperature during lower than 250 ℃ catalyzer nonflammable, so all experiments were carries out during higher than 250 ℃ in the air outlet flue temperature.
1) diesel engine experiment (324 ℃ of air outlet flue temperature)
Experiment, at internal-combustion engine 1200r/min, is carried out under the condition that torque is 100Nm.It is 324 ℃ that electronic control unit 12 obtains exhaust temperature signal c from exhaust gas temperature sensor 11, thereby judges hydrogen nozzle 6 and oxygen jet 7 can spray hydrogen respectively and oxygen is processed diesel engine vent gas.It is 2.0ms that electronic control unit 12 calculates the basic injection pulse width of hydrogen according to obtained fast signal a and air flow rate signal b and formula 2, the basic injection pulse width of oxygen is 1.3ms, therefore, under this operating mode, electronic control unit 12 sends control signal d, g opens 2.0ms by hydrogen nozzle 7, and oxygen jet 6 is opened 1.3ms.Now, it is 3.2ppm that NOx sensor 4 detects the rear NOx concentration of reduction catalyst converter 9, the CO concentration that CO sensor 5 detects after oxidation catalyzer 8 is 3.8ppm, NOx sensor 4 and CO sensor 5 are by sending signal e, and f sends respectively detected NOx and CO concentration to electronic control unit 12.Now, due to NOx and CO concentration, all higher than 2ppm, thereby electronic control unit 12 is judged and is needed to strengthen the injection pulse width of hydrogen and oxygen jet further to reduce the generation of noxious emission.Now, electronic control unit 12 increases to 3.0ms by sending signal d by the injection pulse width of hydrogen nozzle 6, and by sending control signal g, the oxygen lancing pulsewidth is increased to 2.3ms.After the change injection pulse width, the NOx concentration that NOx sensor 4 detects after reduction catalyst converter 9 is 1.2ppm, and the CO concentration that CO sensor 5 detects after oxidation catalyzer 8 is 1.1ppm.NOx sensor 4 and CO sensor 5 are by sending signal e, and f sends respectively detected NOx and CO concentration to electronic control unit 12.Now, due to NOx and CO concentration, all higher than 2ppm, thereby electronic control unit 12 judges that the injection pulse width of hydrogen and oxygen jet should remain unchanged.Internal-combustion engine moves 10min under experimental condition, and the mean concentration of the various main noxious emissions of detected former machine is respectively HC concentration 102ppm, CO concentration 125ppm, and NOx concentration is 54ppm, smoke opacity is 19.1%; Under equal conditions, after having installed tail gas control system provided by the present invention additional, the mean concentration of the various main noxious emissions in internal combustion engine operation 10min is respectively HC concentration 2.1ppm, CO concentration 1.2ppm, NOx concentration is 1.9ppm, and smoke opacity is 3.1%.
2) petrol engine experiment (379 ℃ of air outlet flue temperature)
The petrol engine experiment is 1500r/min in engine speed, the improve effect of this device of checking to gasoline exhaust under the condition that torque is 80Nm.Under this rotating speed and torque, it is 379 ℃ that electronic control unit 12 obtains exhaust temperature signal c from exhaust gas temperature sensor 11, thereby judges hydrogen nozzle 6 and oxygen jet 7 can spray hydrogen respectively and oxygen is processed diesel engine vent gas.It is 1.8ms that electronic control unit 12 calculates the basic injection pulse width of hydrogen according to obtained fast signal a and air flow rate signal b and formula 2, the basic injection pulse width of oxygen is 1.2ms, therefore, under this operating mode, electronic control unit 12 sends control signal d, g opens 1.8ms by hydrogen nozzle 7, and oxygen jet 6 is opened 1.2ms.Now, it is 5.3ppm that NOx sensor 4 detects the rear NOx concentration of reduction catalyst converter 9, the CO concentration that CO sensor 5 detects after oxidation catalyzer 8 is 2.7ppm, NOx sensor 4 and CO sensor 5 are by sending signal e, and f sends respectively detected NOx and CO concentration to electronic control unit 12.Now, due to NOx and CO concentration, all higher than 2ppm, thereby electronic control unit 12 is judged and is needed to strengthen the injection pulse width of hydrogen and oxygen jet further to reduce the generation of noxious emission.Now, electronic control unit 12 increases to 1.8ms by sending signal d by the injection pulse width of hydrogen nozzle 6, and by sending control signal g, the oxygen lancing pulsewidth is increased to 1.2ms.After the change injection pulse width, the NOx concentration that NOx sensor 4 detects after reduction catalyst converter 9 is 1.9ppm, and the CO concentration that CO sensor 5 detects after oxidation catalyzer 8 is 1.8ppm.NOx sensor 4 and CO sensor 5 are by sending signal e, and f sends respectively detected NOx and CO concentration to electronic control unit 12.Now, due to NOx and CO concentration, all higher than 2ppm, thereby electronic control unit 12 judges that the injection pulse width of hydrogen and oxygen jet should remain unchanged.Internal-combustion engine moves 10min under experimental condition, and the mean concentration of the various main noxious emissions of detected former machine is respectively HC concentration 203ppm, CO concentration 197ppm, and NOx concentration is 86ppm; Under equal conditions, after having installed tail gas control system provided by the present invention additional, the mean concentration of the various main noxious emissions in internal combustion engine operation 10min is respectively HC concentration 1.7ppm, CO concentration 1.1ppm, and NOx concentration is 1.7ppm.
Above-mentioned internal combustion engine bench test result shows, adopt a kind of device and method that utilizes hydrogen, oxygen closed loop control engine exhaust provided by the invention, HC, the CO can be under different operating modes produced during to petrol engine and two kinds of typical internal combustion engine operations of diesel engine, NOx and granular material dischargedly play significant improvement effect.
Claims (1)
1. a controlling method of utilizing the device of hydrogen, oxygen closed loop control engine exhaust, this device comprises original internal-combustion engine and internal-combustion engine vent-pipe on automobile;
It also comprises the exhaust gas temperature sensor be arranged on internal-combustion engine vent-pipe, be arranged on reduction catalyst converter and oxidation catalyzer on internal-combustion engine vent-pipe, be arranged on internal-combustion engine vent-pipe and be positioned at the front hydrogen nozzle of reduction catalyst converter, be arranged on internal-combustion engine vent-pipe and be positioned at the front oxygen jet of oxidation catalyzer, be arranged on internal-combustion engine vent-pipe and be positioned at reduction catalyst converter after the NOx sensor, be arranged on internal-combustion engine vent-pipe and be positioned at oxidation catalyzer after the CO sensor; The hydrogen of oxyhydrogen machine processed is connected with hydrogen storage tank and oxygen storage tank respectively with oxygen outlet, and the hydrogen nozzle is connected with hydrogen storage tank and oxygen storage tank respectively with oxygen jet;
Electronic control unit obtains tach signal (a) and air flow rate signal (b) by being connected with former machine sensor;
Electronic control unit obtains Tail Pipe Temperature signal (c) by being connected with exhaust gas temperature sensor;
Electronic control unit, by being connected with NOx sensor and CO sensor, obtains respectively NOx sensor signal (e) and CO sensor signal (f);
Electronic control unit, by being connected with hydrogen nozzle and oxygen jet, sends respectively hydrogen Jet control signal (d) and oxygen jet control signal (g);
It is characterized in that, the method comprises the steps:
The above-mentioned device that utilizes hydrogen, oxygen closed loop control engine exhaust is when operation, and oxyhydrogen machine processed is stored in the hydrogen and the oxygen that make in hydrogen storage tank and oxygen storage tank, electronic control unit obtains the Tail Pipe Temperature signal (c) from exhaust gas temperature sensor, and judges according to delivery temperature whether hydrogen and oxygen jet are opened, when Tail Pipe Temperature during lower than the catalyzer initiation temperature, now electronic control unit sends hydrogen Jet control signal (d) and oxygen jet control signal (g) is closed hydrogen nozzle and oxygen jet, when Tail Pipe Temperature during higher than the catalyzer initiation temperature, electronic control unit sends hydrogen Jet control signal (d) and oxygen jet control signal (g) is opened hydrogen nozzle and oxygen jet, and according to tach signal (a), air flow rate signal (b), NOx sensor signal (e) and CO sensor signal (f) are calculated different rotating speeds, the basic emitted dose of hydrogen and oxygen and correction emitted dose under load and excess air coefficient, and the opening and closing of control hydrogen nozzle and oxygen jet, make HC, CO and particulate matter are oxidized by oxygen into water and carbon dioxide in oxidation catalyzer, and make NOx be reduced into the nitrogen G&W in reduction catalyst converter,
Every circulation actual ejection pulsewidth of the hydrogen that electronic control unit is controlled and oxygen jet is the basic injection pulse width separately and revise the injection pulse width addition and obtain by it respectively;
The calculating of hydrogen and the basic injection pulse width of oxygen: electronic control unit is according to tach signal (a) and air flow rate signal (b) and according to t
H2, b=15m
a/ (ρ
a* V
d* N) [formula 1] and t
O2, b=9.75m
a/ (ρ
a* V
d* N) [formula 2] calculates the basic injection pulse width of hydrogen and oxygen; In formula 1 and formula 2, t
H2, bWith t
O2, bBe respectively the basic injection pulse width of hydrogen and oxygen, its unit is ms, m
aFor the Air Mass Flow Signal obtained from air flow rate signal (c), ρ
aFor air density, V
dFor engine swept volume, N is the internal-combustion engine rotational speed obtained from tach signal (b); When engine load strengthens, the oxyhydrogen gas electronic control unit strengthens the injection pulse width of hydrogen and oxygen automatically according to the result of utilizing formula 1 and formula 2 to calculate, make more hydrogen and oxygen in reduction catalyst converter and oxidation catalyzer, HC, CO, NOx and particulate matter fully are converted into to water, carbon dioxide and nitrogen;
The calculating of hydrogen and oxygen correction injection pulse width: electronic control unit is determined respectively the correction injection pulse width signal of hydrogen and oxygen according to detected NOx sensor signal (e) and CO sensor signal (f), when the NOx concentration of NOx sensor signal (e) that electronic control unit detects indication after reduction catalyst converter catalysis during higher than 2ppm, electronic control unit extends the opening time of hydrogen nozzle by sending hydrogen Jet control signal (d), make more hydrogen enter into reduction catalyst converter, with effective reducing NOx emissions; When the NOx concentration of NOx sensor signal (e) that electronic control unit detects indication after reduction catalyst converter catalysis is less than or equal to 2ppm and is more than or equal to 1ppm, electronic control unit remains unchanged the opening time of hydrogen nozzle by sending hydrogen Jet control signal (d), now, reduction catalyst converter effectively is converted into N by NOx
2When the NOx concentration of NOx sensor signal (e) that electronic control unit detects indication after reduction catalyst converter catalysis is less than 1ppm, electronic control unit reduces the opening time of hydrogen nozzle by sending hydrogen Jet control signal (d), to avoid too much hydrogen to be injected in reduction catalyst converter, thereby reduce the waste to hydrogen; Simultaneously, when the CO concentration of CO sensor signal (f) that electronic control unit detects indication after oxidation catalyzer catalysis during higher than 2ppm, electronic control unit extends the opening time of oxygen jet by sending oxygen jet control signal (g), make more oxygen enter into oxidation catalyzer, with the efficient oxidation CO, HC and granular material discharged; When the CO concentration of CO sensor signal (f) that electronic control unit detects indication after oxidation catalyzer catalysis is less than or equal to 2ppm and is more than or equal to 1ppm, electronic control unit remains unchanged the opening time of oxygen jet by sending oxygen jet control signal (g), now, oxidation catalyzer effectively is converted into CO and water by CO, HC and particulate matter; When the CO concentration of CO sensor signal (f) that electronic control unit detects indication after oxidation catalyzer catalysis is less than 1ppm, electronic control unit reduces the opening time of oxygen jet by sending oxygen jet control signal (g).
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| CN111195481A (en) * | 2020-02-13 | 2020-05-26 | 长安大学 | Volatile organic pollutant purification device and method |
| CN113565600B (en) * | 2020-10-12 | 2022-08-26 | 长城汽车股份有限公司 | Vehicle exhaust gas treatment system and method and vehicle |
| CN115217584B (en) * | 2022-03-01 | 2024-03-08 | 广州汽车集团股份有限公司 | Exhaust gas treatment device and exhaust gas treatment method for hydrogen engine, and vehicle |
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| CN101575999A (en) * | 2009-06-22 | 2009-11-11 | 哈尔滨工程大学 | Hydrogen selective catalytic reduction device and control method thereof |
| CN101956634A (en) * | 2010-09-10 | 2011-01-26 | 北京工业大学 | Device for preparing, storing and feeding vehicle-mounted hydrogen/oxygen and control method thereof |
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| JP3367114B2 (en) * | 1991-05-24 | 2003-01-14 | 株式会社豊田中央研究所 | Method and apparatus for reducing nitrogen oxides in an internal combustion engine |
| JP2780596B2 (en) * | 1993-04-20 | 1998-07-30 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| DE10128414A1 (en) * | 2001-06-12 | 2002-12-19 | Daimler Chrysler Ag | Exhaust gas system for cleaning internal combustion engine exhaust gases comprises a reducing agent supply having a hydrogen-producing unit for enriching the exhaust gas with hydrogen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575999A (en) * | 2009-06-22 | 2009-11-11 | 哈尔滨工程大学 | Hydrogen selective catalytic reduction device and control method thereof |
| CN101956634A (en) * | 2010-09-10 | 2011-01-26 | 北京工业大学 | Device for preparing, storing and feeding vehicle-mounted hydrogen/oxygen and control method thereof |
| CN102155278A (en) * | 2011-03-25 | 2011-08-17 | 北京工业大学 | Vehicle-mounted oxyhydrogen-making machine-based internal-combustion engine emission control device and control method thereof |
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