CN101988440A - Method for controlling oil injection of diesel engine - Google Patents
Method for controlling oil injection of diesel engine Download PDFInfo
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- CN101988440A CN101988440A CN2010105323519A CN201010532351A CN101988440A CN 101988440 A CN101988440 A CN 101988440A CN 2010105323519 A CN2010105323519 A CN 2010105323519A CN 201010532351 A CN201010532351 A CN 201010532351A CN 101988440 A CN101988440 A CN 101988440A
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- 238000002347 injection Methods 0.000 title claims abstract description 43
- 239000007924 injection Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims description 43
- 238000012360 testing method Methods 0.000 claims description 8
- 230000011664 signaling Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 35
- 239000000779 smoke Substances 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method for controlling the oil injection of a diesel engine, which is used for reducing tail-gas pollution. The method comprises the following steps: calculating a demanded injected oil amount by a control unit according to an air inflow measured by an air inlet sensor, calculating actual air inflow according to the engine displacement, the cylinder number of the engine, the volumetric efficiency of engine, the information of engine speed and the actual intake pressure which is measured by a boost pressure sensor in a pressurization system, obtaining calibration values by looking up a gauge according to the engine speed information and the engine gear information, and finally obtaining a maximum injected oil amount according to the actual air inflow and the calibration values, wherein the calibration values refer to a specific value of air inflow and injected oil amount of maximum torque (obtained through a pretest) of the engine under the condition that the engine is at a special gear and a special speed, and the tail gas is up to the standard; when the demanded injected oil amount is greater than the maximum injected oil amount, the control unit controls the actual injected oil amount according to the maximum injected oil amount, and when the demanded injected oil amount is less than or equal to the maximum injected oil amount, the control unit controls the actual injected oil amount according to the demanded injected oil amount.
Description
Technical field
The invention belongs to field of automobile, specially refer to the fuel injection control method of diesel engine.
Background technique
When the diesel common rail engine charge is unreasonable, can produce a large amount of soots, cause pollution to environment.At present, diesel-oil vehicle is to calculate fuel injection quantity according to the air inlet amount of actual measurement, thus the smoke intensity in the restriction tail gas.When the air intake pressurized pipeline of diesel common rail motor comes off or pressurized machine when unusual, all can cause actual air inflow to reduce, but generally be arranged between air-strainer and the pressurized machine owing to measure the air inlet sensor of air inlet amount, therefore the air inlet sensor can not detect the unusual of pressurized machine in real time, cause the smoke intensity limitation function of control system to lose efficacy, can not play good restriction.
Summary of the invention
First purpose of the present invention is the fuel injection control method that proposes a kind of diesel engine, with the smoke intensity in the more effective control tail gas, avoids because gas handling system is leaked gas or unreasonable air inlet such as pressurized machine fault causes in the tail gas smoke intensity excessive.
The fuel injection control method of diesel engine of the present invention, control unit calculates the oil spout demand according to the measured air inflow of air inlet sensor, key is that control unit is simultaneously according to engine displacement, engine cylinder number, the measured actual suction pressure of boost-pressure sensor in motor charging efficiency, engine speed information and the pressurization system calculates actual air inflow, and table look-up according to engine speed information and motor gear information and to obtain calibration value, last control unit draws the maximum spout oil mass according to actual air inflow and calibration value; Described calibration value be by the motor that draws of test in advance under particular gears and speed conditions, send Maximum Torque and tail gas when up to standard air inflow and the ratio of fuel injection quantity; When oil spout demand during greater than the maximum spout oil mass, control unit is controlled actual fuel injection amount according to the maximum spout oil mass, and when the oil spout demand was less than or equal to the maximum spout oil mass, control unit was controlled actual fuel injection amount according to the oil spout demand.
Under the certain condition of fuel injection quantity, in prespecified range, air inflow is big more, and the moment of torsion that motor can provide is also just big more, and after air inflow exceeded prespecified range, the moment of torsion that motor can provide just can not increase thereupon again; And after air inflow is lower than prespecified range, will cause air fuel ratio too small, the oil inflame in the cylinder is insufficient, makes the smoke intensity in the tail gas excessive, befouling environment.Motor under certain gear and speed conditions, send Maximum Torque and tail gas when up to standard air inflow and the ratio of fuel injection quantity be a fixed value, this calibration value is to draw by a large amount of tests in advance, and engine production merchant can provide corresponding relation curve when dispatching from the factory.
When the air intake pressurized pipeline comes off or pressurized machine when unusual, the air inflow that enters cylinder will Billy use the measured air inflow of air inlet sensor few, if also carry out oil spout according to the oil spout demand this moment, will cause fuel oil too much, it is insufficient to burn, make the smoke intensity in the tail gas excessive, befouling environment; And according to engine displacement, engine cylinder number, the actual air inflow that the measured actual suction pressure of motor charging efficiency, engine speed information and the boost-pressure sensor in the pressurization system calculates is identical with the air inflow that enters cylinder, therefore come off or pressurized machine when unusual when the air intake pressurized pipeline, the oil spout demand will be greater than the maximum spout oil mass, this moment, control unit replaced the demand fuel injection quantity with the maximum spout oil mass that calculates, control actual fuel injection amount according to the maximum spout oil mass, just can guarantee that tail gas is up to standard.And boost-pressure sensor generally is installed on behind the Intercooler or the intake manifold place, more is close to cylinder, and technology maturation is reliable, so its data that record more approach the air inlet situation of real engine.
Further, control unit is according to engine displacement, engine cylinder number, and the measured actual suction pressure of the boost-pressure sensor in motor charging efficiency, engine speed information, intake temperature information and the pressurization system calculates actual air inflow.The density of air under different temperatures is different, and control unit draws the density of actual air according to intake temperature information, and then calculates actual air inflow, can guarantee that result of calculation is more accurate.
Further, control unit according to engine speed information and motor gear information table look-up obtain calibration value after, according to intake temperature calibration value is revised again, draw the maximum spout oil mass according to actual air inflow and revised calibration value at last.Calibration value is generally all measured under specified temp (for example normal temperature) condition, its air inflow refers to the air inlet under the specified temp, not necessarily the density of the induced air with reality is identical for the air density of this moment, therefore preferably calibration value is revised, so that calibration value more tallies with the actual situation according to intake temperature.Concrete method for correcting can have a lot, for example say: the density of the induced air the specified temp in when test air density down during with actual use is divided by obtains a ratio, and then calibration value and this ratio that obtains of will tabling look-up is divided by, like this when actual density of the induced air is big, its air inflow also can be bigger, required amount of fuel also can be more, more tallies with the actual situation.
When oil spout demand during more than or equal to the maximum spout oil mass, control unit is reported to the police by signalling device, notes checking air intake pressurized pipeline or pressurized machine with the prompting driver, gets rid of dependent failure as early as possible.
Second purpose of the present invention is the fuel injection control method that proposes a kind of diesel engine, in the smoke intensity of effectively controlling in the tail gas, when avoiding causing owing to unreasonable air inlets such as gas handling system gas leakage or pressurized machine faults that smoke intensity is excessive in the tail gas, reduce cost.
In the fuel injection control method of second kind of diesel engine that the present invention proposes, control unit is according to engine displacement, engine cylinder number, the measured actual suction pressure of boost-pressure sensor in motor charging efficiency, engine speed information and the pressurization system calculates actual air inflow, and table look-up according to engine speed information and motor gear information and to obtain calibration value, last control unit draws the maximum spout oil mass according to actual air inflow and calibration value, and controls actual fuel injection amount according to the maximum spout oil mass; Described calibration value be by the motor that draws of test in advance under particular gears and speed conditions, send Maximum Torque and tail gas when up to standard air inflow and the ratio of fuel injection quantity.
Above-mentioned controlling method has reduced the air inlet sensor of measuring charge flow rate, directly use the maximum spout oil mass to control actual fuel injection amount, guaranteed that motor sends Maximum Torque under current gear and speed conditions and tail gas is up to standard, when the driver needs more high pulling torque, as long as improve the rotating speed of motor or change gear.
For making result of calculation more accurate, control unit is according to engine displacement, engine cylinder number, the measured actual suction pressure of the boost-pressure sensor in motor charging efficiency, engine speed information, intake temperature information and the pressurization system calculates actual air inflow.
For making fuel injection quantity more accurate, realistic demand, control unit according to engine speed information and motor gear information table look-up obtain calibration value after, according to intake temperature calibration value is revised again, draw the maximum spout oil mass according to actual air inflow and revised calibration value at last.
The fuel injection control method of the diesel engine that the present invention proposes is by more effective, more real-time detection gas handling system pressure, calculate the maximum spout oil mass, thereby avoid actual fuel injection amount to exceed the demand of actual air inlet, can avoid exhaust emissions to exceed standard, and can save the air inlet sensor of the diesel engine of egr system, to reduce cost.
Description of drawings
Fig. 1 is the flow chart of fuel injection control method of embodiment 1 diesel engine;
Fig. 2 is the flow chart of fuel injection control method of embodiment 2 diesel engine.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiments and the drawings.
Embodiment 1:
As shown in Figure 1, in the fuel injection control method of the diesel engine of present embodiment, control unit calculates the oil spout demand according to the measured air inflow of air inlet sensor; Control unit is simultaneously according to engine displacement, engine cylinder number, the measured actual suction pressure of boost-pressure sensor in motor charging efficiency, engine speed, intake temperature information and the pressurization system calculates actual air inflow, and table look-up according to engine speed information and motor gear information and to obtain calibration value, according to intake temperature calibration value is revised again, drawn the maximum spout oil mass according to actual air inflow and revised calibration value at last; Described calibration value be by the motor that draws of test in advance under particular gears and speed conditions, send Maximum Torque and tail gas when up to standard air inflow and the ratio of fuel injection quantity; When oil spout demand during greater than the maximum spout oil mass, control unit is controlled actual fuel injection amount according to the maximum spout oil mass, and when the oil spout demand was less than or equal to the maximum spout oil mass, control unit was controlled actual fuel injection amount according to the oil spout demand.
In the calculating of above-mentioned actual air inflow, engine displacement, engine cylinder number is the relation that multiplies each other between motor charging efficiency, the engine speed, its product is revised according to intake temperature information, suction pressure again, can obtain actual air inflow.Suction pressure is big more, and actual air inflow is many more; Intake temperature is high more, and actual air inflow is few more, and it is fixed that concrete correction relation curve can be come according to concrete engine parameter by producer.
When oil spout demand during more than or equal to the maximum spout oil mass, control unit is reported to the police by signalling device, notes checking air intake pressurized pipeline or pressurized machine with the prompting driver, gets rid of dependent failure as early as possible.
Embodiment 2:
As shown in Figure 2, in the fuel injection control method of the diesel engine of present embodiment, control unit is according to engine displacement, engine cylinder number, the motor charging efficiency, engine speed, the measured actual suction pressure of boost-pressure sensor in intake temperature information and the pressurization system calculates actual air inflow, and table look-up according to engine speed information and motor gear information and to obtain calibration value, according to intake temperature calibration value is revised again, draw the maximum spout oil mass according to actual air inflow and revised calibration value at last, and control actual fuel injection amount according to the maximum spout oil mass; Described calibration value be by the motor that draws of test in advance under particular gears and speed conditions, send Maximum Torque and tail gas when up to standard air inflow and the ratio of fuel injection quantity.
Present embodiment is applicable to the diesel engine of not using egr system, can save the air inlet sensor of measuring air inflow, to reduce cost.
Claims (7)
1. the fuel injection control method of a diesel engine, control unit calculates the oil spout demand according to the measured air inflow of air inlet sensor, it is characterized in that control unit is simultaneously according to engine displacement, engine cylinder number, the measured actual suction pressure of boost-pressure sensor in motor charging efficiency, engine speed information and the pressurization system calculates actual air inflow, and table look-up according to engine speed information and motor gear information and to obtain calibration value, last control unit draws the maximum spout oil mass according to actual air inflow and calibration value; Described calibration value be by the motor that draws of test in advance under particular gears and speed conditions, send Maximum Torque and tail gas when up to standard air inflow and the ratio of fuel injection quantity; When oil spout demand during greater than the maximum spout oil mass, control unit is controlled actual fuel injection amount according to the maximum spout oil mass, and when the oil spout demand was less than or equal to the maximum spout oil mass, control unit was controlled actual fuel injection amount according to the oil spout demand.
2. the fuel injection control method of diesel engine according to claim 1, it is characterized in that control unit is according to engine displacement, engine cylinder number, the measured actual suction pressure of the boost-pressure sensor in motor charging efficiency, engine speed information, intake temperature information and the pressurization system calculates actual air inflow.
3. the fuel injection control method of diesel engine according to claim 1 and 2, it is characterized in that control unit according to engine speed information and motor gear information table look-up obtain calibration value after, according to intake temperature calibration value is revised again, drawn the maximum spout oil mass according to actual air inflow and revised calibration value at last.
4. the fuel injection control method of diesel engine according to claim 1 is characterized in that control unit is reported to the police by signalling device when oil spout demand during more than or equal to the maximum spout oil mass.
5. the fuel injection control method of a diesel engine, it is characterized in that control unit is according to engine displacement, engine cylinder number, the measured actual suction pressure of boost-pressure sensor in motor charging efficiency, engine speed information and the pressurization system calculates actual air inflow, and table look-up according to engine speed information and motor gear information and to obtain calibration value, last control unit draws the maximum spout oil mass according to actual air inflow and calibration value, and controls actual fuel injection amount according to the maximum spout oil mass; Described calibration value be by the motor that draws of test in advance under particular gears and speed conditions, send Maximum Torque and tail gas when up to standard air inflow and the ratio of fuel injection quantity.
6. the fuel injection control method of diesel engine according to claim 5, it is characterized in that control unit is according to engine displacement, engine cylinder number, the measured actual suction pressure of the boost-pressure sensor in motor charging efficiency, engine speed information, intake temperature information and the pressurization system calculates actual air inflow.
7. according to the fuel injection control method of claim 5 or 6 described diesel engine, it is characterized in that control unit according to engine speed information and motor gear information table look-up obtain calibration value after, according to intake temperature calibration value is revised again, drawn the maximum spout oil mass according to actual air inflow and revised calibration value at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010532351 CN101988440B (en) | 2010-11-02 | 2010-11-02 | Method for controlling oil injection of diesel engine |
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|---|---|---|---|
| CN 201010532351 CN101988440B (en) | 2010-11-02 | 2010-11-02 | Method for controlling oil injection of diesel engine |
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| CN101988440A true CN101988440A (en) | 2011-03-23 |
| CN101988440B CN101988440B (en) | 2013-01-30 |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454188A (en) * | 2014-10-30 | 2015-03-25 | 长城汽车股份有限公司 | Gasoline injection amount control method and system for dual-fuel engine |
| CN104533645A (en) * | 2014-12-25 | 2015-04-22 | 潍柴动力股份有限公司 | Closed-loop control method and device for engine intake system |
| CN105736206A (en) * | 2016-03-29 | 2016-07-06 | 湖南大学 | Online detection method and device for cyclic fuel injection quantity of engine under variable working conditions |
| CN105986917A (en) * | 2016-06-30 | 2016-10-05 | 深圳市元征科技股份有限公司 | Control method and device for oil injection amount of engine |
| CN106285989A (en) * | 2016-08-15 | 2017-01-04 | 江西汇尔油泵油嘴有限公司 | Distributive value modification method based on rotation speed change and fuel injection control method |
| CN106321266A (en) * | 2015-06-15 | 2017-01-11 | 北京福田康明斯发动机有限公司 | Calculating device and method of engine air inlet flow, engine and vehicle |
| CN103485906B (en) * | 2012-06-12 | 2017-03-01 | 马涅蒂-马瑞利公司 | Method for controlling internal combustion engine |
| CN106762176A (en) * | 2016-12-13 | 2017-05-31 | 安徽航瑞航空动力装备有限公司 | A kind of stroke admission calculation of pressure method of two cylinder machine four |
| CN107762652A (en) * | 2017-09-21 | 2018-03-06 | 南京瑞贻电子科技有限公司 | A kind of car engine air admittance pressure-stabilizing supercharging system and monitoring and managing method |
| CN109869227A (en) * | 2019-03-21 | 2019-06-11 | 福建德普柯发电设备有限公司 | Diesel generating set based on big data arithmetic center |
| CN110608105A (en) * | 2018-06-15 | 2019-12-24 | 上海汽车集团股份有限公司 | Automatic calibration method and device for inflation efficiency |
| CN110905676A (en) * | 2019-12-04 | 2020-03-24 | 潍柴动力股份有限公司 | Engine performance optimization method and device and electronic control unit |
| CN112648097A (en) * | 2020-12-29 | 2021-04-13 | 东台市建东机械制造有限公司 | Oil injection control method of diesel engine |
| CN113167180A (en) * | 2018-12-26 | 2021-07-23 | 潍柴动力股份有限公司 | Engine throttle control method and system |
| CN114087068A (en) * | 2021-10-28 | 2022-02-25 | 东风越野车有限公司 | Diesel engine intake air flow calculation system and equipment |
| CN114673597A (en) * | 2022-03-10 | 2022-06-28 | 哈尔滨工程大学 | Diesel engine transient oil-gas cooperative control method, device and medium |
| CN115387925A (en) * | 2022-09-21 | 2022-11-25 | 重庆潍柴发动机有限公司 | Method and system for improving performance stability of diesel engine in high-temperature environment |
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Cited By (25)
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| CN103485906B (en) * | 2012-06-12 | 2017-03-01 | 马涅蒂-马瑞利公司 | Method for controlling internal combustion engine |
| CN104454188A (en) * | 2014-10-30 | 2015-03-25 | 长城汽车股份有限公司 | Gasoline injection amount control method and system for dual-fuel engine |
| CN104533645A (en) * | 2014-12-25 | 2015-04-22 | 潍柴动力股份有限公司 | Closed-loop control method and device for engine intake system |
| CN104533645B (en) * | 2014-12-25 | 2017-04-19 | 潍柴动力股份有限公司 | Closed-loop control method and device for engine intake system |
| CN106321266A (en) * | 2015-06-15 | 2017-01-11 | 北京福田康明斯发动机有限公司 | Calculating device and method of engine air inlet flow, engine and vehicle |
| CN106321266B (en) * | 2015-06-15 | 2019-04-30 | 北京福田康明斯发动机有限公司 | Computing device, calculation method, engine and the vehicle of engine intake airflow |
| CN105736206A (en) * | 2016-03-29 | 2016-07-06 | 湖南大学 | Online detection method and device for cyclic fuel injection quantity of engine under variable working conditions |
| CN105986917A (en) * | 2016-06-30 | 2016-10-05 | 深圳市元征科技股份有限公司 | Control method and device for oil injection amount of engine |
| WO2018000741A1 (en) * | 2016-06-30 | 2018-01-04 | 深圳市元征科技股份有限公司 | Control method and device for oil injection amount of engine |
| CN106285989A (en) * | 2016-08-15 | 2017-01-04 | 江西汇尔油泵油嘴有限公司 | Distributive value modification method based on rotation speed change and fuel injection control method |
| CN106762176A (en) * | 2016-12-13 | 2017-05-31 | 安徽航瑞航空动力装备有限公司 | A kind of stroke admission calculation of pressure method of two cylinder machine four |
| CN107762652A (en) * | 2017-09-21 | 2018-03-06 | 南京瑞贻电子科技有限公司 | A kind of car engine air admittance pressure-stabilizing supercharging system and monitoring and managing method |
| CN110608105B (en) * | 2018-06-15 | 2021-11-23 | 上海汽车集团股份有限公司 | Automatic calibration method and device for inflation efficiency |
| CN110608105A (en) * | 2018-06-15 | 2019-12-24 | 上海汽车集团股份有限公司 | Automatic calibration method and device for inflation efficiency |
| CN113167180A (en) * | 2018-12-26 | 2021-07-23 | 潍柴动力股份有限公司 | Engine throttle control method and system |
| CN109869227B (en) * | 2019-03-21 | 2020-11-10 | 福建壹中正和信息科技有限公司 | Diesel generating set based on big data operation center |
| CN109869227A (en) * | 2019-03-21 | 2019-06-11 | 福建德普柯发电设备有限公司 | Diesel generating set based on big data arithmetic center |
| CN110905676A (en) * | 2019-12-04 | 2020-03-24 | 潍柴动力股份有限公司 | Engine performance optimization method and device and electronic control unit |
| CN110905676B (en) * | 2019-12-04 | 2022-07-19 | 潍柴动力股份有限公司 | Engine performance optimization method and device and electronic control unit |
| CN112648097A (en) * | 2020-12-29 | 2021-04-13 | 东台市建东机械制造有限公司 | Oil injection control method of diesel engine |
| CN114087068A (en) * | 2021-10-28 | 2022-02-25 | 东风越野车有限公司 | Diesel engine intake air flow calculation system and equipment |
| CN114673597A (en) * | 2022-03-10 | 2022-06-28 | 哈尔滨工程大学 | Diesel engine transient oil-gas cooperative control method, device and medium |
| CN114673597B (en) * | 2022-03-10 | 2023-01-31 | 哈尔滨工程大学 | Diesel engine transient oil-gas cooperative control method, device and medium |
| CN115387925A (en) * | 2022-09-21 | 2022-11-25 | 重庆潍柴发动机有限公司 | Method and system for improving performance stability of diesel engine in high-temperature environment |
| CN115387925B (en) * | 2022-09-21 | 2024-02-20 | 重庆潍柴发动机有限公司 | Method and system for improving performance stability of diesel engine in high-temperature environment |
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