CN104832337A - System and method for controlling thermal load of high-pressure direct injector in trace diesel ignition cylinder - Google Patents
System and method for controlling thermal load of high-pressure direct injector in trace diesel ignition cylinder Download PDFInfo
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- CN104832337A CN104832337A CN201510245435.7A CN201510245435A CN104832337A CN 104832337 A CN104832337 A CN 104832337A CN 201510245435 A CN201510245435 A CN 201510245435A CN 104832337 A CN104832337 A CN 104832337A
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Abstract
The invention discloses a system and a method for controlling a thermal load of a high-pressure direct injector in a trace diesel ignition cylinder. The method comprises the following steps of an ECU (Electronic Control Unit) is respectively connected to a natural gas injection control electromagnetic valve, a diesel injection control electromagnetic valve, a cooling diesel quantity control valve and an injector thermal load monitoring feedback system; the diesel/natural gas injector is respectively connected to the natural gas injection control electromagnetic valve and the diesel injection control electromagnetic valve; an annular cooling oil cavity is arranged in a needle valve body of the diesel/natural gas injector; after the cooling diesel enters the annular cooling oil cavity to cool the needle valve body of the injector, the cooling diesel flows into a diesel return pipeline. The system and the method have the beneficial effects that the thermal load of the needle valve body of the direct injector can be effectively controlled to prevent faults, such as burning loss, blockage and coking, of the needle valve body of the injector due to the excess temperature of the needle valve body of the direct injector.
Description
Technical field
The present invention relates to technical field of internal combustion engines, particularly relate to a kind of micro-diesel oil ignited cylinder inner high voltage and directly spray sparger heat load control system and method.
Background technique
The diesel oil ignited cylinder inner high voltage direct-jet natural gas engine of trace, owing to adopting Gas diffusion combustion manner, velocity of combustion is fast, and tendency to detonate is little, can adopt the compression ratio suitable with diesel engine, and the thermal efficiency is higher than common premixed natural gas motor; Eliminate throttle valve structure, restriction loss is little, and volumetric efficiency is high; Employing rock gas is main fuel, and C/H ratio is lower, and reduce the discharge of particulate matter and greenhouse gases, adiabatic flame temperature is low, NO simultaneously
xemission control is easier to, and scavenging process almost enters vent systems without fuel, and HC discharge is low, and therefore this h type engine h can be issued to better emission performance in the prerequisite of not sacrificing power character, has good using value.
The rock gas that the diesel oil ignited cylinder inner high voltage direct-jet natural gas engine of trace sprays into cylinder is lighted by micro-diesel oil spray bundle, the ignition behavior of diesel oil spray bundle directly affects follow-up whole diffusive combustion process, for ensureing the penetration distance of diesel pilot spray bundle, thus obtaining stability of igniting preferably, diesel oil spray orifice design aperture is very little; And in whole service condition range, within the emitted dose of diesel oil accounts for 5% of total amount of fuel, circulation diesel oil amount is less, near causing sparger spray orifice, heat load is higher, diesel oil spray orifice easy carbonization coking during the high load running of engine long time, even there is the problem that diesel oil spray orifice blocks, affect the normal work of motor.
Summary of the invention
Object of the present invention is exactly to solve the problem, propose a kind of micro-diesel oil ignited cylinder inner high voltage and directly spray sparger heat load control system and method, it is too high that this system and method overcomes conventional natural gas sparger heat load, the problem of sparger scaling loss, improves the reliability of motor, Economy and emission performance.
To achieve these goals, the present invention adopts following technological scheme:
A kind of micro-diesel oil ignited cylinder inner high voltage directly sprays sparger heat load control system, comprising: electric control system ECU, diesel/natural gas sparger, natural gas injection Controlling solenoid valve, diesel injection Controlling solenoid valve, cooling diesel oil quantity control valve and sparger heat load monitoring feedback system;
Described electric control system ECU and natural gas injection Controlling solenoid valve, diesel injection Controlling solenoid valve, cool diesel oil quantity control valve and sparger heat load monitoring feedback system is connected respectively; Diesel/natural gas sparger is connected respectively with natural gas injection Controlling solenoid valve and diesel injection Controlling solenoid valve;
Arrange annular cooling oil chamber in the needle-valve body of described diesel/natural gas sparger, cooling diesel oil enters annular cooling oil chamber and cools rear inflow diesel oil return line to injector needle valve body.
Described diesel/natural gas sparger also comprises: cool diesel oil return tube in cooling diesel oil feeding pipe and sparger in sparger; In described sparger, cooling diesel oil feeding pipe is connected with annular cooling oil chamber; In sparger, cooling diesel oil return tube is connected with diesel oil return line; Diesel oil, after annular cooling oil chamber, cools diesel oil return tube and flows into diesel oil return line in sparger.
Described cooling diesel oil quantity control valve is arranged on diesel oil return line.
Described sparger heat load monitoring feedback system comprises: engine temperature sensing unit, exhaust gas temperature sensor, cylinder temperature sensor, diesel oil recirculating oil quantity sensor and intake flow sensor; The sensor is connected with electric control system ECU respectively.
Described intake flow sensor and exhaust gas temperature sensor are separately positioned on engine charge pipeline and gas exhaust piping; Described diesel oil recirculating oil quantity sensor setting is on diesel oil return line; Described cylinder temperature sensor setting is at engine air cylinder interior; Described engine temperature sensing unit is arranged on engine body water cavity wall.
Described diesel/natural gas sparger is also connected respectively with high-pressure natural gas supply pipeline and high-pressure diesel oil feed line, for supplying high-pressure diesel and high-pressure natural gas to diesel/natural gas sparger.
The diesel oil ignited cylinder inner high voltage of trace directly sprays a controlling method for sparger heat load control system, comprises the following steps:
S301, after engine start, electric control system ECU controls motor and runs under idling operation;
S302, the initial opening of electric control system ECU setting cooling diesel oil quantity control valve, maintains the normal oil return in diesel oil and natural gas injection process;
S303, when motor runs to a certain operating point, sparger heat load monitoring feedback system gathers temperature, cylinder combustion temperature degree, delivery temperature, the charge flow rate of motor and cools diesel oil recirculating oil quantity parameter, and by the parameter transmission of collection to electric control system ECU, electric control system ECU calculates the temperature of diesel/natural gas injector needle valve body according to the temperature of motor, cylinder combustion temperature degree, delivery temperature, charge flow rate, calculates the intensity of cooling of cooling diesel injector needle-valve body according to diesel injection amount, cooling diesel oil recirculating oil quantity;
According to result of calculation, S304, judges whether intensity of cooling meets the demands;
S305, if met the demands, electric control system ECU exports to cooling diesel control valve the instruction maintaining current intensity of cooling; Otherwise electric control system ECU is increased by cooling diesel control valve or reduction aperture changes intensity of cooling, until intensity of cooling meets the demands;
S306, determines the corresponding relation between present engine operating point and cooling diesel control valve aperture, completes the demarcation to current working point;
S307, repeats step S303-S306, the demarcation of the whole operating point of complete coupled engines.
Engine load is comparatively large, and during diesel/natural gas sparger heat load height, the increase of electric control system ECU controlled cooling model diesel oil fuel-flow control valve opening increases diesel oil flow, and then increases diesel oil to the intensity of cooling of diesel/natural gas sparger;
Start load lower, when diesel/natural gas sparger heat load is low, the reduction of electric control system ECU controlled cooling model diesel oil fuel-flow control valve opening reduces diesel oil flow, and then reduces diesel oil to the intensity of cooling of diesel/natural gas sparger.
The invention has the beneficial effects as follows:
Annular cooling oil chamber is increased in diesel/natural gas sparger of the present invention, cooling diesel oil enters and in sparger, to cool diesel oil return tube by cooling diesel oil suction tude in sparger after annular cooling oil chamber cools injector needle valve body flow into diesel oil return line, flow back to fuel tank, effectively can control the heat load of directly spraying injector needle valve body, prevent injector needle valve body temperature too high, cause the faults such as injector needle valve body scaling loss, stuck, coking.Thus it is too high to overcome conventional natural gas sparger heat load, the problem of sparger scaling loss, improves the reliability of motor, Economy and emission performance.
Sparger heat load monitoring feedback system can the heat load of Real-time Feedback motor and sparger, demarcates the diesel oil intensity of cooling of different operating conditions, and realizes the operation with closed ring that heat load controls.
Electric control system ECU is according to the MAP of demarcating in advance, realize the flexible control to sparger intensity of cooling, engine load is comparatively large, when sparger heat load is higher, increases the flow flowing through injector needle valve body diesel oil, increase diesel oil to the intensity of cooling of sparger, start load lower, when sparger heat load is lower, reduce the flow flowing through injector needle valve body diesel oil, weaken the intensity of cooling of diesel oil to sparger, reduce the power consumption of diesel pump.
Accompanying drawing explanation
Fig. 1 is that the diesel oil ignited cylinder inner high voltage of trace of the embodiment of the present invention directly sprays sparger heat load Control system architecture schematic diagram;
Fig. 2 is diesel/natural gas emitter construction schematic diagram of the present invention;
Fig. 3 is that the diesel oil ignited cylinder inner high voltage of trace of the embodiment of the present invention directly sprays sparger heat load control system controlling method flow chart.
Wherein, 101 motors, 102 engine temperature sensing units, 103 exhaust gas temperature sensors, 104 cylinder temperature sensors, 105 electric control system ECUs, 106 high-pressure natural gas supply pipelines, 107 diesel/natural gas spargers, 108 natural gas injection Controlling solenoid valve, 109 diesel injection Controlling solenoid valve, 110 cooling diesel oil quantity control valves, 111 diesel oil recirculating oil quantity sensors, 112 diesel oil return lines, 113 high-pressure diesel oil feed lines, 114 intake flow sensors;
Cooling diesel oil return tube in cooling diesel oil feeding pipe, 202 annular cooling oil chambers, 203 injector needle valve bodies, 204 diesel oil needle-valves, 205 rock gas needle-valves, 206 spargers in 201 spargers.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
Fig. 1 gives the specific embodiment that the diesel oil ignited cylinder inner high voltage of a kind of trace directly sprays sparger heat load control system, comprising:
Motor 101, engine temperature sensing unit 102, exhaust gas temperature sensor 103, cylinder temperature sensor 104, electric control system ECU 105, high-pressure natural gas supply pipeline 106, diesel/natural gas sparger 107, natural gas injection Controlling solenoid valve 108, diesel injection Controlling solenoid valve 109, cooling diesel oil quantity control valve 110, diesel oil recirculating oil quantity sensor 111, diesel oil return line 112, high-pressure diesel oil feed line 113 and intake flow sensor 114;
Electric control system ECU 105 and natural gas injection Controlling solenoid valve 108, diesel injection Controlling solenoid valve 109, cool diesel oil quantity control valve 110, engine temperature sensing unit 102, exhaust gas temperature sensor 103, cylinder temperature sensor 104, diesel oil recirculating oil quantity sensor 111 and intake flow sensor 114 and be connected respectively;
Intake flow sensor 114 and exhaust gas temperature sensor 103 are separately positioned on engine charge pipeline and gas exhaust piping; Described diesel oil recirculating oil quantity sensor 111 is arranged on diesel oil return line 112; Described cylinder temperature sensor 104 is arranged on motor 101 cylinder interior; Described engine temperature sensing unit 102 is arranged on engine body water cavity wall.
Diesel/natural gas sparger 107 is connected respectively with natural gas injection Controlling solenoid valve 108 and diesel injection Controlling solenoid valve 109; High-pressure natural gas supply pipeline 106, diesel oil return line 112 and high-pressure diesel oil feed line 113 are all communicated with diesel/natural gas sparger 107.
Diesel/natural gas sparger 107 comprises: cooling diesel oil return tube 206 in cooling diesel oil feeding pipe 201, annular cooling oil chamber 202, injector needle valve body 203, diesel oil needle-valve 204, rock gas needle-valve 205 and sparger.In sparger, cooling diesel oil feeding pipe 201 is connected with annular cooling oil chamber 202; In sparger, cooling diesel oil return tube 206 is connected with diesel oil return line 111;
Injector needle valve body 203 is used for installing needle-valve, and the motion of diesel oil needle-valve 204 can control the injection of diesel oil, and rock gas needle-valve 205 is used for controlling the injection of rock gas.
Diesel oil by cooling diesel oil feeding pipe 201 in annular cooling oil chamber 202 after injector needle valve body 203 cools one week, in sparger, cool diesel oil return tube 206 flow into diesel oil return line 111.
In cylinder inner high voltage direct-jet natural gas engine 101 working procedure, high-pressure natural gas supply pipeline 106 and high-pressure diesel oil feed line 113 supply high-pressure diesel and high-pressure natural gas respectively to diesel/natural gas sparger 107, diesel injection Controlling solenoid valve 109 and natural gas injection Controlling solenoid valve 108 are to the in-cylinder injection diesel pilot of motor 101 and main combustion rock gas under the control of electric control system ECU 105, and fuel combustion is also externally done work.
Annular cooling oil chamber 202 in processing in injector needle valve body 203, cooling diesel oil enters and from sparger in cools diesel oil return tube 206 after annular cooling oil chamber 202 pairs of injector needle valve bodies 203 cool by cooling diesel oil suction tude 201 in sparger and flow into diesel oil return line 112, flows back to fuel tank.The flow of cooling diesel oil controls by cooling diesel oil quantity control valve 110 flexibly according to the heat load of motor.
The working state of engine temperature sensing unit 102, exhaust gas temperature sensor 103, cylinder temperature sensor 104 and intake flow sensor 114 monitor engines in real time in course of injection, and gathered data are transferred to electric control system ECU 105, the aperture that automatical control system utilizes monitoring parameter to adjust cooling diesel oil quantity control valve 110 in real time realizes the control to cooling oil mass, thus controls the heat load of injector needle valve body.
The diesel oil ignited cylinder inner high voltage of trace directly sprays sparger heat load controlling method as shown in Figure 2, comprises the following steps:
S301 first motor 101 start after, electric control system ECU 105 makes motor run under idling operation;
The load of S302 at this moment motor 101 is very low, and the heat load of straight spray sparger is very low, and the beginning of automatical control system setting cooling diesel oil quantity control valve 110 is very little, maintains the normal oil return in diesel oil and natural gas injection process;
S303 is when motor runs to a certain operating point, the sensor of heat load monitoring feedback system gathers fuel gas temperature, delivery temperature, charge flow rate and cooling diesel oil recirculating oil quantity in the temperature of motor 101, cylinder and is transferred to electric control system ECU 105, and electric control system ECU 105 calculates the heat load of straight spray sparger and cooling diesel oil to the intensity of cooling of injector needle valve body 203;
Whether S304 subsequently electric control system ECU 105 meets the demands to intensity of cooling according to result of calculation and judges;
S305 exports adjustment according to different judged result automatical control systems to cooling diesel oil quantity control valve 110 or maintains current intensity of cooling instruction;
S306 cools diesel oil quantity control valve 110 and increases or reduce aperture change intensity of cooling, electric control system ECU 105 judges whether intensity of cooling meets the demands again, and after meeting the demands, the relation of automatical control system determination engine operating condition point and cooling diesel oil quantity control valve 110 aperture completes the demarcation of this operating point;
Then the demarcation that step S303-S306 completes whole operating point is repeated, engine stabilizer, reliable operation.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technological scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. the diesel oil ignited cylinder inner high voltage of trace directly sprays sparger heat load control system, it is characterized in that, comprising: electric control system ECU, diesel/natural gas sparger, natural gas injection Controlling solenoid valve, diesel injection Controlling solenoid valve, cooling diesel oil quantity control valve and sparger heat load monitoring feedback system;
Described electric control system ECU and natural gas injection Controlling solenoid valve, diesel injection Controlling solenoid valve, cool diesel oil quantity control valve and sparger heat load monitoring feedback system is connected respectively; Diesel/natural gas sparger is connected respectively with natural gas injection Controlling solenoid valve and diesel injection Controlling solenoid valve;
Arrange annular cooling oil chamber in the needle-valve body of described diesel/natural gas sparger, cooling diesel oil enters annular cooling oil chamber and cools rear inflow diesel oil return line to injector needle valve body.
2. a kind of micro-diesel oil ignited cylinder inner high voltage as claimed in claim 1 directly sprays sparger heat load control system, and it is characterized in that, described diesel/natural gas sparger also comprises: cooling diesel oil feeding pipe and sparger interior cooling diesel oil return tube in sparger; In described sparger, cooling diesel oil feeding pipe is connected with annular cooling oil chamber; In sparger, cooling diesel oil return tube is connected with diesel oil return line; Diesel oil, after annular cooling oil chamber, cools diesel oil return tube and flows into diesel oil return line in sparger.
3. a kind of micro-diesel oil ignited cylinder inner high voltage as claimed in claim 1 directly sprays sparger heat load control system, and it is characterized in that, described cooling diesel oil quantity control valve is arranged on diesel oil return line.
4. a kind of micro-diesel oil ignited cylinder inner high voltage as claimed in claim 1 directly sprays sparger heat load control system, it is characterized in that, described sparger heat load monitoring feedback system comprises: engine temperature sensing unit, exhaust gas temperature sensor, cylinder temperature sensor, diesel oil recirculating oil quantity sensor and intake flow sensor; The sensor is connected with electric control system ECU respectively.
5. a kind of micro-diesel oil ignited cylinder inner high voltage as claimed in claim 1 directly sprays sparger heat load control system, and it is characterized in that, described intake flow sensor and exhaust gas temperature sensor are separately positioned on engine charge pipeline and gas exhaust piping; Described diesel oil recirculating oil quantity sensor setting is on diesel oil return line; Described cylinder temperature sensor setting is at engine air cylinder interior; Described engine temperature sensing unit is arranged on engine body water cavity wall.
6. a kind of micro-diesel oil ignited cylinder inner high voltage as claimed in claim 1 directly sprays sparger heat load control system, it is characterized in that, described diesel/natural gas sparger is also connected respectively with high-pressure natural gas supply pipeline and high-pressure diesel oil feed line, for supplying high-pressure diesel and high-pressure natural gas to diesel/natural gas sparger.
7. micro-diesel oil ignited cylinder inner high voltage as claimed in claim 1 directly sprays a controlling method for sparger heat load control system, it is characterized in that, comprises the following steps:
S301, after engine start, electric control system ECU controls motor and runs under idling operation;
S302, the initial opening of electric control system ECU setting cooling diesel oil quantity control valve, maintains the normal oil return in diesel oil and natural gas injection process;
S303, when motor runs to a certain operating point, sparger heat load monitoring feedback system gathers temperature, cylinder combustion temperature degree, delivery temperature, the charge flow rate of motor and cools diesel oil recirculating oil quantity parameter, and by the parameter transmission of collection to electric control system ECU, electric control system ECU calculates the temperature of diesel/natural gas injector needle valve body according to the temperature of motor, cylinder combustion temperature degree, delivery temperature, charge flow rate, calculates the intensity of cooling of cooling diesel injector needle-valve body according to diesel injection amount, cooling diesel oil recirculating oil quantity;
According to result of calculation, S304, judges whether intensity of cooling meets the demands;
S305, if met the demands, electric control system ECU exports to cooling diesel control valve the instruction maintaining current intensity of cooling; Otherwise electric control system ECU is increased by cooling diesel control valve or reduction aperture changes intensity of cooling, until intensity of cooling meets the demands;
S306, determines the corresponding relation between present engine operating point and cooling diesel control valve aperture, completes the demarcation to current working point;
S307, repeats step S303-S306, the demarcation of the whole operating point of complete coupled engines.
8. the diesel oil ignited cylinder inner high voltage of a kind of trace as claimed in claim 7 directly sprays the controlling method of sparger heat load control system, it is characterized in that, engine load is larger, during diesel/natural gas sparger heat load height, the increase of electric control system ECU controlled cooling model diesel oil fuel-flow control valve opening increases diesel oil flow, and then increases diesel oil to the intensity of cooling of diesel/natural gas sparger;
Start load lower, when diesel/natural gas sparger heat load is low, the reduction of electric control system ECU controlled cooling model diesel oil fuel-flow control valve opening reduces diesel oil flow, and then reduces diesel oil to the intensity of cooling of diesel/natural gas sparger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510245435.7A CN104832337B (en) | 2015-05-14 | 2015-05-14 | The diesel oil ignited cylinder inner high voltage of trace directly sprays sparger heat load control system and method |
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| CN201510245435.7A CN104832337B (en) | 2015-05-14 | 2015-05-14 | The diesel oil ignited cylinder inner high voltage of trace directly sprays sparger heat load control system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184929A (en) * | 2018-09-21 | 2019-01-11 | 陕西柴油机重工有限公司 | A kind of dual fuel engine ignition integrated system and its control method |
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| US20010007338A1 (en) * | 2000-01-12 | 2001-07-12 | Roger Popp | Gaseous fuel injector having high heat tolerance |
| US20070235556A1 (en) * | 2006-03-31 | 2007-10-11 | Harmon Michael P | Nozzle assembly |
| CN104373268A (en) * | 2014-11-27 | 2015-02-25 | 南岳电控(衡阳)工业技术有限公司 | Heavy machine oil sprayer device with circulating cooling |
| CN204646492U (en) * | 2015-05-14 | 2015-09-16 | 山东大学 | The diesel oil ignited cylinder inner high voltage of trace directly sprays sparger heat load control system |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010007338A1 (en) * | 2000-01-12 | 2001-07-12 | Roger Popp | Gaseous fuel injector having high heat tolerance |
| US20070235556A1 (en) * | 2006-03-31 | 2007-10-11 | Harmon Michael P | Nozzle assembly |
| CN104373268A (en) * | 2014-11-27 | 2015-02-25 | 南岳电控(衡阳)工业技术有限公司 | Heavy machine oil sprayer device with circulating cooling |
| CN204646492U (en) * | 2015-05-14 | 2015-09-16 | 山东大学 | The diesel oil ignited cylinder inner high voltage of trace directly sprays sparger heat load control system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184929A (en) * | 2018-09-21 | 2019-01-11 | 陕西柴油机重工有限公司 | A kind of dual fuel engine ignition integrated system and its control method |
| CN109184929B (en) * | 2018-09-21 | 2022-10-14 | 陕西柴油机重工有限公司 | Ignition and combustion integrated system of dual-fuel engine and control method thereof |
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| CN104832337B (en) | 2016-01-27 |
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