CN113236454A - Novel engine system and injection pulse width correction method - Google Patents
Novel engine system and injection pulse width correction method Download PDFInfo
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- CN113236454A CN113236454A CN202110644707.6A CN202110644707A CN113236454A CN 113236454 A CN113236454 A CN 113236454A CN 202110644707 A CN202110644707 A CN 202110644707A CN 113236454 A CN113236454 A CN 113236454A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/10—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone
- F02M25/12—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding acetylene, non-waterborne hydrogen, non-airborne oxygen, or ozone the apparatus having means for generating such gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0076—Details of the fuel feeding system related to the fuel tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
Abstract
The invention discloses a novel engine system and an injection pulse width correction method, comprising a cylinder body, an electronic control unit and a supply system, wherein the supply system is connected with the cylinder body; the supply system comprises a fuel tank, a fuel system and a hydrogen production system, wherein one end of the fuel system and one end of the hydrogen production system are respectively connected with the fuel tank, and the other ends of the fuel system and the hydrogen production system are respectively connected with the cylinder body; the cylinder body is provided with an air inlet end and an air outlet end, the air inlet end and the air outlet end are respectively connected to the cylinder body, and by adopting the technical scheme, because the supply system comprises the fuel tank, the fuel system and the hydrogen production system, one ends of the fuel system and the hydrogen production system are respectively connected to the fuel tank, and the other ends of the fuel system and the hydrogen production system are respectively connected to the cylinder body, the pulse width can be adjusted in real time to be improved, so that the heat efficiency of the engine is improved, the cold start characteristic is improved, and the combustion effect is improved.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a molded engine system and an injection pulse width correction method.
Background
The shortage of petroleum resources is a major subject faced by the sustainable development of the economy in China at present, the fuel of the automobiles in China is mainly gasoline and petroleum, along with the annual increase of the automobile keeping quantity in China, the proportion of the transportation energy in the energy consumption in China increases day by day, and the problems of petroleum resource shortage in China and atmospheric pollution caused by automobile exhaust gas are increasingly highlighted; there are also methanol engines, but methanol engines have a high ignition lower limit, low vapor pressure, poor cold startability, and the presence of unconventional emissions such as formaldehyde and unburned methanol.
Disclosure of Invention
The invention aims to provide a novel engine system and an injection pulse width correction method for improving the thermal efficiency of an engine, improving the cold start characteristic and improving the combustion effect.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a novel engine system comprises a cylinder body, an electronic control unit and a supply system, wherein the supply system is connected with the cylinder body, and the electronic control unit is respectively connected with the cylinder body and the supply system; the supply system comprises a fuel tank, a fuel system and a hydrogen production system, wherein one end of the fuel system and one end of the hydrogen production system are respectively connected with the fuel tank, and the other ends of the fuel system and the hydrogen production system are respectively connected with the cylinder body; the cylinder body is provided with inlet end and exhaust end, inlet end and exhaust end connect respectively in the cylinder body.
Preferably, the fuel system includes a fuel pump, an injection rail, and a first injector, the first injector being disposed at one end of the intake pipe, the injection rail being connected at one end thereof to the first injector and at the other end thereof to the fuel tank, the fuel pump being disposed between the fuel tank and the injection rail.
Preferably, the hydrogen production system comprises a gas pump, a reformer and a second ejector, the second ejector is arranged on the cylinder body, one end of the second ejector is connected to the reformer, the reformer is further connected to a fuel tank, and the gas pump is arranged between the second ejector and the reformer.
Preferably, the air inlet end comprises an air inlet pipeline, a filter, a first booster pump and a throttle valve, the filter is arranged at one end of the air inlet pipeline, and the other end of the air inlet pipeline is connected to the cylinder body; the first booster pump sets up in one side of filter, the throttle valve sets up between first booster pump and cylinder body, be provided with first sensor between first booster pump and the throttle valve, be provided with the second sensing between throttle valve and the cylinder body, first sensor is temperature pressure sensor, the second sensor is phase sensor.
Preferably, the exhaust end comprises an exhaust pipeline, a second supercharger and a catalyst, one end of the exhaust pipeline is connected to the cylinder body, the catalyst is arranged at the other end of the exhaust pipeline, the second supercharger is arranged between the cylinder body and the catalyst, the two ends of the catalyst are respectively provided with a third sensor, and a fourth sensor is arranged between the third sensor and the second supercharger; the third sensor is an oxygen sensor, and the fourth sensor is a temperature sensor.
Preferably, a fifth sensor and a spark plug are further arranged on the cylinder body, the spark plug is arranged at one end of the cylinder body, the fifth sensor is arranged on one side of the cylinder body, and the fifth sensor comprises a cooling water temperature sensor, a pressure sensor and a knock sensor.
Preferably, the injection rail is provided with a sixth sensor, and the sixth sensor is a temperature and pressure sensor.
Preferably, the electronic control unit comprises an incremental PID controller, which is connected to the electronic control unit.
Preferably, the electronic control unit is connected to the first sensor, the second sensor, the third sensor, the fourth sensor, the fifth sensor, the sixth sensor, the first supercharger, the second supercharger, the first injector, the second injector, and the spark plug, respectively.
In addition, the invention discloses an injection pulse width correction method of a novel engine system, which comprises the following steps:
s1, reading the rotating speed and the load of an engine by an electronic control unit through a throttle valve and a second sensor;
s2, inputting the rotating speed and the load read in the step S1 into an electronic control unitReading the expected discharge temperature T from the MAP by an incremental PID controller preset in the electronic control unith(n)；
S3, acquiring actual discharge temperature T of the exhaust pipeline through a third sensorf(n)；
S4, the electronic control unit expects the discharge temperature T according to the steps S2 and S3h(n) and the actual discharge temperature Tf(n) calculating the temperature difference Td(n)，Td(n)＝Th(n)-Tf(n)；
S5, using td (n) of step S4 as an input parameter, calculating an injection pulse width correction value Δ t (n), where Δ t (n) is a0Td(n)+a1Td(n-1)+a2Td(n-2) wherein,
Kpdenotes the proportionality coefficient, tiRepresenting integration time, tdRepresenting the differential time, t representing the sampling period;
s6, correcting the injection pulse width through an incremental PID controller, wherein the correction amount is delta t (n) in the step S5.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the cold start characteristic of the engine is improved by adding the methanol engine on the basis of the existing methanol engine, the combustion speed of hydrogen is high, and the thermal efficiency of the engine can be improved.
(2) The reformer is used for preparing hydrogen, so that the risks of hydrogen storage and filling are avoided.
(3) The hydrogen adopts direct injection in the cylinder, so that the tempering problem of the injection of the air inlet pipeline is avoided.
(4) The injection pulse width of the engine can be adjusted in real time, the combustion efficiency of the engine is improved,
drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of an injection pulsewidth correction method of the novel engine system of the present invention.
In the figure, 1-cylinder, 2-feed system, 3-first sensor, 4-throttle, 5-first injector, 6-second sensor, 7-electronic control unit, 8-second injector, 9-spark plug, 10-fourth sensor, 11-third sensor, 12-catalyst, 13-fuel tank, 14-fuel pump, 15-injection rail, 16-sixth sensor, 17-cooling water temperature sensor, 18-knock sensor, 19-phase sensor, 20-gas pump, 21-reformer, 22-first supercharger, 23-second supercharger, 24-filter, 25-intake pipe, 26-exhaust pipe, 27-fifth sensor, 201-fuel system, 202-Hydrogen production System.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1-2, a novel engine system comprises a cylinder block 1, an electronic control unit 7 and a supply system 2, wherein the supply system 2 is connected to the cylinder block 1, and the electronic control unit 7 is respectively connected to the cylinder block 1 and the supply system 2; the supply system 2 comprises a fuel tank 13, a fuel system 201 and a hydrogen production system 202, wherein one ends of the fuel system 201 and the hydrogen production system 202 are respectively connected to the fuel tank 13, and the other ends are respectively connected to the cylinder 1; the cylinder body 1 is provided with inlet end and exhaust end, and inlet end and exhaust end connect respectively in cylinder body 1, promote engine thermal efficiency, promote cold start characteristic and improve the combustion effect.
In addition, the fuel system 201 includes a fuel pump 14, an injection rail 15, and a first injector 5, the first injector 5 being disposed at one end of the intake duct 25, the injection rail 15 having one end connected to the first injector 5 and the other end connected to the fuel tank 13, the fuel pump 14 being disposed between the fuel tank 13 and the injection rail 15.
Further, the hydrogen production system 202 comprises a gas pump 20, a reformer 21 and a second ejector 8, wherein the second ejector 8 is arranged on the cylinder body 1, one end of the second ejector 8 is connected to the reformer 21, the reformer 21 is further connected to a fuel tank, and the gas pump 20 is arranged between the second ejector 8 and the reformer 21, so that the risk of hydrogen storage and filling is avoided, the cold start characteristic of the engine is improved, and the thermal efficiency of the engine is improved.
In addition, the air inlet end comprises an air inlet pipeline 25, a filter 24, a first booster pump and a throttle valve 4, the filter 24 is arranged at one end of the air inlet pipeline 25, and the other end of the air inlet pipeline 25 is connected to the cylinder body 1; the first booster pump is arranged on one side of the filter 24, the throttle valve 4 is arranged between the first booster pump and the cylinder body 1, the first sensor 3 is arranged between the first booster pump and the throttle valve 4, the second sensor is arranged between the throttle valve 4 and the cylinder body 1, the first sensor 3 is a temperature and pressure sensor, the second sensor 6 is a phase sensor 19, and parameters of an air inlet end are monitored in real time.
Further, the exhaust end comprises an exhaust pipeline 26, a second supercharger 23 and a catalyst 12, one end of the exhaust pipeline 26 is connected to the cylinder body 1, the catalyst 12 is arranged at the other end of the exhaust pipeline 26, the second supercharger 23 is arranged between the cylinder body 1 and the catalyst 12, two ends of the catalyst 12 are respectively provided with a third sensor 11, and a fourth sensor 10 is arranged between the third sensor 11 and the second supercharger 23; the third sensor 11 is an oxygen sensor, the fourth sensor 10 is a temperature sensor, and parameters of the exhaust end are monitored in real time.
In addition, a fifth sensor 27 and a spark plug 9 are further arranged on the cylinder body 1, the spark plug 9 is arranged at one end of the cylinder body 1, the fifth sensor 27 is arranged at one side of the cylinder body 1, and the fifth sensor 27 comprises a cooling water temperature sensor 17, a pressure sensor and a knock sensor 18, so that the electronic control unit 7 can monitor parameters of the cylinder body 1 in real time.
Further, the injection rail 15 is provided with a sixth sensor 16, and the sixth sensor 16 is a temperature and pressure sensor.
In addition, the electronic control unit 7 comprises an incremental PID controller, which is connected to the electronic control unit and is capable of calculating the pulse width adjustment and correcting it in time.
Further, the electronic control unit 7 is connected to the first sensor 3, the second sensor 6, the third sensor 11, the fourth sensor 10, the fifth sensor 27, the sixth sensor 16, the first pressure booster 22, the second pressure booster 23, the first injector 5, the second injector 8, and the ignition plug 9, respectively, and the electronic control unit 7 is capable of monitoring and controlling the cylinder block 1.
In addition, the invention discloses an injection pulse width correction method of a novel engine system, which comprises the following steps:
s1, reading the rotating speed and the load of an engine by an electronic control unit 7 through a throttle valve 4 and a second sensor 6;
s2, inputting the rotating speed and the load read in the step S1 into the electronic control unit 7, and reading the expected discharge temperature T from the MAP by an incremental PID controller preset in the electronic control unit 7h(n)；
S3, acquiring actual discharge temperature T of exhaust pipeline 26 through third sensor 11f(n)；
S4. the electronic control unit 7 predicts the discharge temperature T according to the expected discharge temperatures in step S2 and step S3h(n) and the actual discharge temperature Tf(n) calculating the temperature difference Td(n)，Td(n)＝Th(n)-Tf(n)；
S5, using td (n) of step S4 as an input parameter, calculating an injection pulse width correction value Δ t (n), where Δ t (n) is a0Td(n)+a1Td(n-1)+a2Td(n-2) wherein,
Kpdenotes the proportionality coefficient, tiRepresenting integration time, tdRepresenting the differential time, t representing the sampling period;
s6, correcting the injection pulse width through an incremental PID controller, wherein the correction amount is delta t (n) in the step S5.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A novel engine system is characterized in that: the device comprises a cylinder body, an electronic control unit and a supply system, wherein the supply system is connected with the cylinder body, and the electronic control unit is respectively connected with the cylinder body and the supply system; the supply system comprises a fuel tank, a fuel system and a hydrogen production system, wherein one end of the fuel system and one end of the hydrogen production system are respectively connected with the fuel tank, and the other ends of the fuel system and the hydrogen production system are respectively connected with the cylinder body; the cylinder body is provided with inlet end and exhaust end, inlet end and exhaust end connect respectively in the cylinder body.
2. The novel engine system of claim 1, wherein: the fuel system includes a fuel pump, an injection rail, and a first injector disposed at one end of an intake pipe, the injection rail having one end connected to the first injector and the other end connected to a fuel tank, the fuel pump being disposed between the fuel tank and the injection rail.
3. The novel engine system of claim 1, wherein: the hydrogen production system comprises a gas pump, a reformer and a second ejector, wherein the second ejector is arranged on the cylinder body, one end of the second ejector is connected to the reformer, the reformer is further connected to a fuel tank, and the gas pump is arranged between the second ejector and the reformer.
4. The novel engine system of claim 1, wherein: the air inlet end comprises an air inlet pipeline, a filter, a first booster pump and a throttle valve, the filter is arranged at one end of the air inlet pipeline, and the other end of the air inlet pipeline is connected to the cylinder body; the first booster pump sets up in one side of filter, the throttle valve sets up between first booster pump and cylinder body, be provided with first sensor between first booster pump and the throttle valve, be provided with the second sensing between throttle valve and the cylinder body, first sensor is temperature pressure sensor, the second sensor is phase sensor.
5. The novel engine system of claim 1, wherein: the exhaust end comprises an exhaust pipeline, a second supercharger and a catalyst, one end of the exhaust pipeline is connected to the cylinder body, the catalyst is arranged at the other end of the exhaust pipeline, the second supercharger is arranged between the cylinder body and the catalyst, third sensors are respectively arranged at two ends of the catalyst, and a fourth sensor is arranged between the third sensors and the second supercharger; the third sensor is an oxygen sensor, and the fourth sensor is a temperature sensor.
6. The novel engine system of claim 5, wherein: still be provided with fifth sensor and spark plug on the cylinder body, the spark plug sets up in the one end of cylinder body, the fifth sensor sets up in one side of cylinder body, the fifth sensor includes cooling water temperature sensor, pressure sensor and knock sensor.
7. The novel engine system of claim 2, wherein: the injection rail is provided with a sixth sensor which is a temperature and pressure sensor.
8. The novel engine system of claim 1, wherein: the electronic control unit comprises an incremental PID controller, and the incremental PID controller is connected with the electronic control unit.
9. The novel engine system of claim 8, wherein: the electronic control unit is respectively connected with the first sensor, the second sensor, the third sensor, the fourth sensor, the fifth sensor, the sixth sensor, the first supercharger, the second supercharger, the first injector, the second injector and the spark plug.
10. The injection pulsewidth correction method of the novel engine system as defined in claim 1, wherein: the method comprises the following steps:
s1, reading the rotating speed and the load of an engine by an electronic control unit through a throttle valve and a second sensor;
s2, inputting the rotating speed and the load read in the step S1 into an electronic control unit, and reading the expected discharge temperature T from a MAP (MAP) by an incremental PID (proportion integration differentiation) controller preset in the electronic control unith(n)；
S3, acquiring actual discharge temperature T of the exhaust pipeline through a third sensorf(n)；
S4, the electronic control unit expects the discharge temperature T according to the steps S2 and S3h(n) and the actual discharge temperature Tf(n) calculating the temperature difference Td(n)，Td(n)＝Th(n)-Tf(n)；
S5, using td (n) of step S4 as an input parameter, calculating an injection pulse width correction value Δ t (n), where Δ t (n) is a0Td(n)+a1Td(n-1)+a2Td(n-2) wherein,
Kpdenotes the proportionality coefficient, tiRepresenting integration time, tdRepresenting the differential time, t representing the sampling period;
s6, correcting the injection pulse width through an incremental PID controller, wherein the correction amount is delta t (n) in the step S5.
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| CN202110644707.6A CN113236454A (en) | 2021-06-09 | 2021-06-09 | Novel engine system and injection pulse width correction method |
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| WO2013001558A1 (en) * | 2011-06-27 | 2013-01-03 | 株式会社 日立製作所 | Engine system |
| CN110541776A (en) * | 2019-08-19 | 2019-12-06 | 杭州电子科技大学 | Natural gas water-mixing combustion engine and water mixing control method thereof |
-
2021
- 2021-06-09 CN CN202110644707.6A patent/CN113236454A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6370870B1 (en) * | 1998-10-14 | 2002-04-16 | Nissan Motor Co., Ltd. | Exhaust gas purifying device |
| JP2001254640A (en) * | 2000-03-13 | 2001-09-21 | Nissan Motor Co Ltd | Exhaust emission control device of fuel reformed gas engine |
| US20070028905A1 (en) * | 2003-10-21 | 2007-02-08 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine utilizing hydrogen |
| JP2007303403A (en) * | 2006-05-12 | 2007-11-22 | Mazda Motor Corp | Fuel injection system for engine |
| CN101092919A (en) * | 2007-07-12 | 2007-12-26 | 李钢坤 | Fuel system of engine of using mixed burning alcohol and oxygen |
| WO2013001558A1 (en) * | 2011-06-27 | 2013-01-03 | 株式会社 日立製作所 | Engine system |
| CN102748143A (en) * | 2012-06-29 | 2012-10-24 | 北京工业大学 | Control method for power system of dimethyl ether/hydrogen internal combustion engine |
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