CN103758673A - Diesel engine cold start control system and method - Google Patents
Diesel engine cold start control system and method Download PDFInfo
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- CN103758673A CN103758673A CN201410025216.3A CN201410025216A CN103758673A CN 103758673 A CN103758673 A CN 103758673A CN 201410025216 A CN201410025216 A CN 201410025216A CN 103758673 A CN103758673 A CN 103758673A
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Abstract
The invention discloses a diesel engine cold start control system and method. The system comprises a high-pressure gas holder, a detector, a storage device, and a controller; the high-pressure gas holder connected with an intake pip is capable of filling the intake pipe with gas; the detector is used for detecting diesel engine water temperature, ambient temperature and atmospheric pressure; the storage device is used for pre-storing a diesel engine water temperature set value, an ambient temperature set value and an atmospheric pressure set value. The controller is used for receiving a cold start signal; when judging the measured diesel engine water temperature, ambient temperature and atmospheric pressure are lower than the corresponding set values; the controller outputs a signal of opening the high-pressure gas holder, a signal of closing an outlet of an intercooler and a signal of opening an exhaust throttle valve under a preset opening; when judging cold start is finished, the controller outputs a signal of closing the high-pressure gas holder, a signal of opening the outlet of the intercooler and a signal of fully opening of the exhaust throttle valve. When the diesel engine is cold-started in a cold plateau area, the high-pressure gas holder is used to supply gas; intake for cold start of the diesel engine is increased, so that the rate of successfully cold-starting the diesel engine in the cold plateau area is increased.
Description
Technical field
The present invention relates to Diesel Engine Technique Field, particularly relate to a kind of cold starting control system and method for diesel engine.
Background technique
What diesel engine sucked in intake stroke is pure air, in compression stroke, approaches at the end, by oil sprayer, diesel oil is sprayed in cylinder, mixes with the high temperature air after compression, forms inflammable mixture.Because diesel engine compression ratio is high, so compression stroke at the end, cylinder inner air pressure can reach 3.5～4.5MPa, and simultaneous temperature, up to 750～1000K, substantially exceeds the spontaneous ignition temperature of diesel oil, and inflammable mixture self-burning promotes descent of piston acting.
But, at extremely frigid zones, along with the rising of height above sea level, mercury dropped, air density declines, and causes the pressure and temperature of diesel engine compression terminal under starting speed too low, makes diesel engine cold start very difficult, thereby causes the damage of mass energy waste and vehicle.
In view of this, how improving the cold-start performance of diesel engine at extremely frigid zones, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of cold starting control system and method for diesel engine, can improve the cold-start performance of diesel engine at extremely frigid zones.
For solving the problems of the technologies described above, the invention provides a kind of cold starting control system of diesel engine, suction tude and outlet pipe that described diesel engine comprises intercooler, is connected with described intercooler, be provided with exhaust shutter on described outlet pipe; Described control system comprises:
Gascollecting cap cylinder, is connected with suction tude, can be inflated to described suction tude;
Detection device, for detection of diesel engine water temperature, ambient temperature and atmospheric pressure;
Storage, the diesel engine water temperature that prestores setting value, ambient temperature setting value and atmospheric pressure setting value;
Controller, receives cold starting start signal; Judge that diesel engine water temperature, ambient temperature and atmospheric pressure that described detection device records are lower than corresponding setting value, output open described gascollecting cap cylinder signal, close the signal of described intercooler outlet, and make the signal of described exhaust shutter in predetermined aperture; Judge that cold starting completes, output close described gascollecting cap cylinder signal, open the signal of described intercooler outlet, and make the signal of described exhaust shutter in full-gear.
Preferably, described detection device is also for detection of the force value in described gascollecting cap cylinder; Also the prestore pressure set points of described gascollecting cap cylinder of described storage;
After described controller judges that diesel engine water temperature, ambient temperature and atmospheric pressure are lower than corresponding setting value, also judge that described force value is lower than described pressure set points, export to the signal of described gascollecting cap cylinder inflation.
Preferably, described controller judges that cold starting cannot complete, and the signal of described gascollecting cap cylinder is closed in output, reenters cold-start program; Described controller judges that cold starting cannot complete, and selects an establishment with following condition:
Diesel engine speed is not more than the first speed setting value, and diesel engine be not less than running time first running time setting value;
Pressure difference value in described gascollecting cap cylinder and described suction tude is not more than preset difference value.
Preferably, described controller judges that cold starting completes, and with following condition, sets up:
Diesel engine speed exceedes the second speed setting value, and diesel engine exceed running time second running time setting value.
Preferably, the outlet of described gascollecting cap cylinder is provided with air-strainer.
The present invention also provides a kind of control method of cold start of diesel engine, comprises the steps:
10) detect diesel engine water temperature, ambient temperature and atmospheric pressure;
20) judge that diesel engine water temperature, ambient temperature and atmospheric pressure, whether lower than corresponding setting value, are, open gascollecting cap cylinder, close intercooler outlet, and make exhaust shutter in predetermined aperture;
30) judge that cold starting completes, close gascollecting cap cylinder, open intercooler outlet, and make exhaust shutter in full-gear.
Preferably, step 20) in, after judging that diesel engine water temperature, ambient temperature and atmospheric pressure are lower than corresponding setting value, also judge that force value in gascollecting cap cylinder, whether lower than pressure set points, is to inflate to gascollecting cap cylinder.
Preferably, step 20) in, judge whether following condition selects an establishment:
Diesel engine speed is not more than the first speed setting value, and diesel engine be not less than running time first running time setting value;
The difference of high-pressure gas cylinder pressure and suction tude internal pressure is not more than preset difference value;
Be, close gascollecting cap cylinder, again cold starting.
Preferably, step 30) in, judge that cold starting completes, with following condition, set up:
Diesel engine speed exceedes the second speed setting value, and diesel engine exceed running time second running time setting value.
Cold starting control system and the method for diesel engine provided by the invention, be provided with the gascollecting cap cylinder being connected with suction tude, when diesel engine is during in extremely frigid zones cold starting, by gascollecting cap cylinder air feed, can improve the suction pressure of air inlet pipe of diesel engine, thus the air inflow while improving diesel engine cold start, and then improve the pressure and temperature in compression terminal cylinder of diesel engine, fuel oil can fully be burnt, finally improve the cold starting success rate of diesel engine at extremely frigid zones.
Accompanying drawing explanation
Fig. 1 is the structure diagram that disposes the diesel engine of cold starting control system provided by the present invention;
Fig. 2 is the structured flowchart of a kind of embodiment of cold starting control system provided by the present invention;
Fig. 3 is the flow chart of a kind of embodiment of control method of cold start provided by the present invention.
In Fig. 1-2:
Embodiment
Core of the present invention is to provide a kind of cold starting control system and method for diesel engine, can improve the cold-start performance of diesel engine at extremely frigid zones.
In order to make those skilled in the art person understand better the present invention program, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.For ease of understanding and describing succinctly, below in conjunction with cold starting control system and the method for diesel engine, describe, beneficial effect no longer repeats to discuss.
Please refer to Fig. 1, Fig. 1 is the structure diagram that disposes the diesel engine of cold starting control system provided by the present invention.
As shown in Figure 1, suction tude 12 and outlet pipe 14 that diesel engine comprises cylinder 13, is connected with cylinder 13, suction tude 12 is connected with intercooler 11, is provided with exhaust shutter 141 on outlet pipe 14.
In this programme, the cold starting control system of diesel engine comprises gascollecting cap cylinder 15, and this gascollecting cap cylinder 15 is connected with suction tude 12, can be inflated to suction tude 12.
Please also refer to Fig. 2, Fig. 2 is the structured flowchart of a kind of embodiment of cold starting control system provided by the present invention.
This control system also comprises detection device 30, for detection of diesel engine water temperature, ambient temperature and atmospheric pressure; Particularly, can detect respectively above-mentioned each parameter by cooling-water temperature sensor, environment temperature sensor and barometric pressure sensor, wherein, cooling-water temperature sensor can be arranged to the outlet pipe of diesel engine, environment temperature sensor is arranged at the vehicle frame of vehicle, and barometric pressure sensor can be integrated in the ECU of vehicle.
It is pointed out that and can the first switch valve 111 be set in intercooler 11 outlet, by this first switch valve 111, open or close the outlet of intercooler 11, thereby be communicated with or block the gas circuit between intercooler 11 and suction tude 12; Similarly, can second switch valve 151 be set in gascollecting cap cylinder 15 outlet, by this second switch valve 151, open or close the outlet of gascollecting cap cylinder 15, thereby be communicated with or block the gas circuit between gascollecting cap cylinder 15 and suction tude 12.
Also it is pointed out that in cold starting process, the exhaust shutter 141 arranging on outlet pipe 14, in predetermined aperture, because in starting process, need to be guaranteed airflow, and diesel engine residual waste gas of when work needs to discharge.But the aperture of exhaust shutter 141 needs suitably, if the aperture of exhaust shutter 141 is excessive, the air pressure in cylinder 13 cannot promote the short time, affects cold starting.In above-mentioned cold starting process, the predetermined aperture of exhaust shutter 141 can obtain by Experimental Calibration.
Please, in the lump in conjunction with Fig. 3, Fig. 3 is the flow chart of a kind of embodiment of control method of cold start provided by the present invention.
The step of control method of cold start of applying above-mentioned cold starting control system is as follows:
S11, detection diesel engine water temperature, ambient temperature and atmospheric pressure;
S12, judge that diesel engine water temperature, ambient temperature and atmospheric pressure, whether lower than corresponding setting value, are, open gascollecting cap cylinder 15, close intercooler 11 and export, and make exhaust shutter 141 in predetermined aperture;
In this step, controller 20 judges that diesel engine water temperature, ambient temperature and atmospheric pressure are all lower than corresponding setting value, show that now diesel engine is difficult to cold starting or cannot cold starting according to normal cold-start program, by gascollecting cap cylinder 15 air feed, because the gas pressure in gascollecting cap cylinder 15 is higher, can improve the suction pressure of suction tude 11, make to be full of in cylinder 13 enough air, thereby fuel oil is fully burnt, and then improve the cold-start performance of diesel engine.
Here, close intercooler 11 and export, its objective is for fear of the gas in gascollecting cap cylinder 15 and flow into intercooler 11 pipelines such as grade, affect the air inflow of diesel engine.
Particularly, by opening second switch valve 151, realize the unlatching of gascollecting cap cylinder 15, close the first switch valve 111 and realize closing that intercooler 11 exports.
S13, judge that cold starting completes, close gascollecting cap cylinder 15, open intercooler 11 and export, and make exhaust shutter 141 in full-gear.
After diesel engine cold start completes, enter normal operation, can close gascollecting cap cylinder 15, open intercooler 11 and export, according to normal procedure, move.
Particularly, by closing second switch valve 151, realize closing of gascollecting cap cylinder 15, open the first switch valve 111 and realize the unlatching that intercooler 11 exports.
Cold starting control system and the method for diesel engine provided by the invention, the gascollecting cap cylinder 15 being connected with suction tude 11 is set, when diesel engine is during in extremely frigid zones cold starting, by gascollecting cap cylinder 15 air feed, improve the suction pressure of air inlet pipe of diesel engine 11, thereby improve the air inflow of diesel engine cold start, and then improve the pressure and temperature in compression terminal cylinder of diesel engine 13, fuel oil can fully be burnt, finally improve the cold starting success rate of diesel engine at extremely frigid zones.
Further, detection device 30 is also for detection of the force value in gascollecting cap cylinder 15, storage 40 pressure set points in gascollecting cap cylinder 15 that also prestores.
Force value in the gascollecting cap cylinder 15 that controller 20 can receiving detection device 30 records, and transfer the pressure set points in the gascollecting cap cylinder 15 in storage 40, both are compared, judge that described force value, lower than described pressure set points, exports to the signal that gascollecting cap cylinder 15 is inflated.
Particularly, can inflate to gascollecting cap cylinder 15 by motor 16, to reaching pressure set points.
That is,, in above-mentioned steps S12, after judging that diesel engine water temperature, ambient temperature and atmospheric pressure are lower than corresponding setting value, also comprise step:
S121, judge that force value in gascollecting cap cylinder 15, whether lower than pressure set points, is, inflate to gascollecting cap cylinder 15.
So, can avoid the force value in gascollecting cap cylinder 15 too low, cannot effectively improve the suction pressure of suction tude 11.In cold-start program, when controller 20 judgements need to be implemented cold starting by gascollecting cap cylinder 15 air feed, further detect the force value in gascollecting cap cylinder 15, to guarantee can effectively improving air inflow in cold starting process, thereby improve cold starting success rate.
The pressure set points of gascollecting cap cylinder 15 also can be passed through Experimental Calibration, and is stored in storage 40.
Further, in cold starting process, controller 20 also judges whether cold starting can complete, if judge, cold starting cannot complete, and the signal of gascollecting cap cylinder 15 is closed in output, reenters cold-start program.
That is,, in step S12, also comprise step:
S122, judge whether following condition selects an establishment:
Diesel engine speed is not more than the first speed setting value, and diesel engine be not less than running time first running time setting value;
Pressure difference value in gascollecting cap cylinder 15 and suction tude 12 is not more than preset difference value.
Be, close gascollecting cap cylinder 15, reenter cold-start program.
The state that diesel engine may exist starter gear not engage completely with flywheel gear in cold starting process, now diesel engine cannot be dragged, if gascollecting cap cylinder 15 continues to suction tude 12 air feed, only can cause waste and the wearing and tearing to vehicle, therefore, when in diesel engine cold start process, meet above-mentioned first condition, close gascollecting cap cylinder 15, stop air inlet, reenter cold-start program, until cold starting completes.
That is, above-mentioned first condition shows that blind engagement occurs diesel engine, wherein the first speed setting value and first running time setting value all can pass through Experimental Calibration, and be stored in storage 40.In a kind of specific embodiment, this first speed setting value is 50r/min, and be 12s the first running time.
In diesel engine cold start process, if the pressure drop in gascollecting cap cylinder 15, with the pressure difference value in suction tude 12 below preset difference value, meet above-mentioned second condition, diesel engine remains unfulfilled cold starting, can think that continuing air inlet also cannot complete cold starting, now, if gascollecting cap cylinder 15 continues to suction tude 12 air feed, also only can cause waste and the wearing and tearing to vehicle.In a kind of specific embodiment, described preset difference value is 0.2MPa.
In the various embodiments described above, controller 20 judges that cold starting completes, and with following condition, sets up:
Diesel engine speed exceedes the second speed setting value, and diesel engine exceed running time second running time setting value.
Here, the second speed setting value is the cut-out rotating speed of diesel engine, and in cold starting process, diesel engine speed reaches this value, shows that diesel engine has completed starting, can enter normal operation.For avoiding in cold starting process, diesel engine is instantaneous this cut-out rotating speed that exceedes, and does not in fact complete cold starting, also further defines the running time that diesel engine exceedes this cut-out rotating speed.
Particularly, described the second speed setting value and described second running time setting value can demarcate according to different type of machines, and be stored in storage 40.
Here it is pointed out that above-mentioned diesel engine speed, diesel engine running time, suction tude 12 internal pressure values all can directly read from the detector of diesel engine system, certainly, also can arrange special detection device and obtain separately.
Further, can air-strainer 152 be set in the outlet of gascollecting cap cylinder 15, for removing the granulometric impurity of gas, avoid the wearing and tearing of parts and components of diesel engine.
Can also inlet air heating grid 121 be set in suction tude 12, air inlet is heated, further to improve the temperature and pressure in compression end of a period cylinder 13, improve the cold-start performance of diesel engine.
Above cold starting control system and the method for a kind of diesel engine provided by the present invention are all described in detail.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a cold starting control system for diesel engine, suction tude (12) and outlet pipe (14) that described diesel engine comprises intercooler (11), is connected with described intercooler (11), be provided with exhaust shutter (141) on described outlet pipe (14); It is characterized in that, described control system comprises:
Gascollecting cap cylinder (15), is connected with suction tude (12), can be inflated to described suction tude (12);
Detection device (30), for detection of diesel engine water temperature, ambient temperature and atmospheric pressure;
Storage (40), the diesel engine water temperature that prestores setting value, ambient temperature setting value and atmospheric pressure setting value;
Controller (20), receives cold starting start signal; Judge that diesel engine water temperature, ambient temperature and atmospheric pressure that described detection device (30) records are lower than corresponding setting value, output open described gascollecting cap cylinder (15) signal, close the signal of described intercooler (11) outlet, and make the signal of described exhaust shutter (141) in predetermined aperture; Judge that cold starting completes, output close described gascollecting cap cylinder (15) signal, open the signal of described intercooler (11) outlet, and make the signal of described exhaust shutter (141) in full-gear.
2. cold starting control system as claimed in claim 1, is characterized in that, described detection device (30) is also for detection of the force value in described gascollecting cap cylinder (15); Also the prestore pressure set points of described gascollecting cap cylinder (15) of described storage (40);
After described controller (20) judges that diesel engine water temperature, ambient temperature and atmospheric pressure are lower than corresponding setting value, also judge that described force value is lower than described pressure set points, export to the signal of described gascollecting cap cylinder (15) inflation.
3. cold starting control system as claimed in claim 1, is characterized in that: described controller (20) judges that cold starting cannot complete, and the signal that described gascollecting cap cylinder (15) are closed in output, reenters cold-start program; Described controller (20) judges that cold starting cannot complete, and selects an establishment with following condition:
Diesel engine speed is not more than the first speed setting value, and diesel engine be not less than running time first running time setting value;
Pressure difference value in described gascollecting cap cylinder (15) and described suction tude (12) is not more than preset difference value.
4. cold starting control system as claimed in claim 1, is characterized in that, described controller (20) judges that cold starting completes, and with following condition, sets up:
Diesel engine speed exceedes the second speed setting value, and diesel engine exceed running time second running time setting value.
5. the cold starting control system as described in claim 1 to 4 any one, is characterized in that, the outlet of described gascollecting cap cylinder (15) is provided with air-strainer (152).
6. a control method of cold start for diesel engine, is characterized in that, comprises the steps:
10) detect diesel engine water temperature, ambient temperature and atmospheric pressure;
20) judge that diesel engine water temperature, ambient temperature and atmospheric pressure, whether lower than corresponding setting value, are, open gascollecting cap cylinder (15), close intercooler (11) outlet, and make exhaust shutter (141) in predetermined aperture;
30) judge that cold starting completes, close gascollecting cap cylinder (15), open intercooler (11) outlet, and make exhaust shutter (141) in full-gear.
7. control method of cold start as claimed in claim 6, it is characterized in that, step 20) in, after judging that diesel engine water temperature, ambient temperature and atmospheric pressure are lower than corresponding setting value, also judge that whether the interior force value of gascollecting cap cylinder (15) is lower than pressure set points, to give gascollecting cap cylinder (15) inflation.
8. control method of cold start as claimed in claim 6, is characterized in that step 20) in, judge whether following condition selects an establishment:
Diesel engine speed is not more than the first speed setting value, and diesel engine be not less than running time first running time setting value;
The difference of gascollecting cap cylinder (15) internal pressure and suction tude (11) internal pressure is not more than preset difference value;
To close gascollecting cap cylinder (15), cold starting again.
9. control method of cold start as claimed in claim 6, is characterized in that step 30) in, judge that cold starting completes, with following condition, set up:
Diesel engine speed exceedes the second speed setting value, and diesel engine exceed running time second running time setting value.
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| CN201410025216.3A CN103758673B (en) | 2014-01-20 | 2014-01-20 | Cold start control system and the method for diesel engine |
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| CN201410025216.3A CN103758673B (en) | 2014-01-20 | 2014-01-20 | Cold start control system and the method for diesel engine |
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| CN104265480A (en) * | 2014-08-25 | 2015-01-07 | 北京理工大学 | Starting fuel output control method of diesel under plateau environment |
| CN108730094A (en) * | 2018-06-28 | 2018-11-02 | 潍柴动力股份有限公司 | A kind of auxiliary starter control system and method under low temperature in plateau environment |
| CN109356761A (en) * | 2018-12-18 | 2019-02-19 | 安徽江淮汽车集团股份有限公司 | A kind of diesel engine preheating control method and module |
| CN110821689A (en) * | 2019-11-28 | 2020-02-21 | 潍柴动力股份有限公司 | Cold start control method and device and electronic control unit |
| CN112377319B (en) * | 2020-11-13 | 2021-11-26 | 北京理工大学 | Oil injection pressure control method for improving cold starting performance of diesel engine |
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| CN112377319B (en) * | 2020-11-13 | 2021-11-26 | 北京理工大学 | Oil injection pressure control method for improving cold starting performance of diesel engine |
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| CN103758673B (en) | 2016-05-11 |
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