CN101694184B - Method for controlling fuel injection when starting engine - Google Patents
Method for controlling fuel injection when starting engine Download PDFInfo
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- CN101694184B CN101694184B CN 200910184828 CN200910184828A CN101694184B CN 101694184 B CN101694184 B CN 101694184B CN 200910184828 CN200910184828 CN 200910184828 CN 200910184828 A CN200910184828 A CN 200910184828A CN 101694184 B CN101694184 B CN 101694184B
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- fuel injection
- engine
- oil spout
- oil
- cylinder
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- 238000002347 injection Methods 0.000 title claims abstract description 69
- 239000007924 injection Substances 0.000 title claims abstract description 69
- 239000000446 fuel Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001360 synchronised effect Effects 0.000 claims abstract description 26
- 239000003921 oil Substances 0.000 claims description 96
- 239000000295 fuel oil Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001568 sexual effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010761 intermediate fuel oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
Images
Abstract
The invention relates to a method for controlling fuel injection when starting an engine. The starting time of a fuel injector is determined according to the fuel injection time, and the duration time of the fuel injector after starting is determined according to the fuel injection pulse width, wherein the fuel injection time and the fuel injection cylinder number are determined according to the engine crankshaft signal and phase signal obtained by detection; and the fuel injection pulse width is determined according to the detected temperature of the engine, and the compensation is carried out according to the detected battery voltage. The method combines the advantages of the sequential injection and synchronous injection in the current fuel injection control of the engine, and carries out combined control to the synchronous fuel injection and sequential fuel injection on the fuel injection in the starting process.
Description
Technical field
The present invention relates to the control field of automobile engine system, is the specific implementation that the control effect to engine control system is optimized, and can be used for the startup oil spout control of 4 cylinder gasoline engine systems, is specifically related to a kind of method for controlling fuel injection when starting engine.
Background technique
Present engine technology and engine control technology become better and approaching perfection day by day, and can continue to optimize and perfect place but still have.Starting oil spout control in the at present known technical field realizes with sequence-injection, the synchronous injection substantially.Can find that from practical application if adopt synchronous spray regime fully, the responsiveness of startup can be fine, but the fuel oil of a certain cylinder may occur owing to can not enter combusted cylinder fully, and cause difficulty in starting, deterioration of emission etc.; And if adopt sequence-injection fully, then can make the starting-up response sexual deviation.The mode that both mix use will more be conducive to start control and emission control.
In sum, have following technical problem in the prior art: (1) may cause incomplete combustion, difficulty in starting, deterioration of emission with synchronous injection; (2) sequence-injection starting-up response sexual deviation.
Summary of the invention
The object of the invention is to that oil spout is optimized control to gasoline engine starting, to reach best startup effect.
Specifically, the object of the present invention is to provide a kind of method for controlling fuel injection when starting engine, by the advantage of binding sequence oil spout and synchronous oil spout, reach the engine start best results, start faster, more steady, more excellent than the discharging of synchronous oil spout, and reduce and flood the cylinder phenomenon than sequence-injection.
Tactful content of the present invention comprises that engine control system passes through the monitoring to battery voltage, engine temperature, engine crankshaft position signal and phase signal, engine speed, realizes the control of start-up course intermediate fuel oil time for spraying, fuel oil injection pulse width, fuel oil ejection cylinder number.
Control object in the content of the present invention is oil sprayer, determines the oil sprayer start-up time according to the fuel oil time for spraying, determines the oil sprayer unlatching endurance according to the fuel oil injection pulse width.Wherein fuel oil time for spraying, fuel oil ejection cylinder number are determined according to engine crankshaft position signal and phase signal that detection obtains; The fuel oil injection pulse width is determined according to the engine temperature that detects, and is compensated according to the battery voltage that detects.
The starting condition different according to motor in the content of the present invention determined different oil spout control strategies.The engine start condition can be divided into cold machine starting condition establishment, the establishment of cold machine restart condition, the establishment of warm boot condition, therefore can select suitable Injection strategy according to above different starting condition.
Need among the present invention the number of times of oil spout is counted, and adjust in real time fuel injection pulsewidth according to the oil spout number of times.
According to the oil spout phase place, the fuel injection pulsewidth that detect, calculate first oil spout and carry out several cylinders and spray synchronously among the present invention.
Among the present invention, after executing first oil spout, if motor does not start successfully, then the fuel injection pulsewidth in the follow-up start-up course is rationally decayed according to the oil spout number of times.
Concrete technological scheme is as follows:
A kind of method for controlling fuel injection when starting engine adopts engine control system that oil sprayer is controlled, and opens the endurance by start-up time and the oil sprayer of control oil sprayer, carries out the control of fuel injection when starting engine.
The start-up time of described control oil sprayer, its fuel oil time for spraying that obtains according to monitoring for engine control system is determined the start-up time of this oil sprayer.
Described oil sprayer is opened the endurance, and its fuel oil injection pulse width that obtains according to monitoring for engine control system is determined this oil sprayer unlatching endurance.
Described fuel oil time for spraying and fuel oil ejection cylinder number detect the engine crankshaft position signal and the phase signal that obtain according to engine control system and determine.
Described fuel oil injection pulse width is determined according to the engine temperature that engine control system detects, and is compensated according to the battery voltage that detects.
The concrete following steps that adopt:
(1) engine control system is judged synchronous engine cylinder number according to engine crankshaft signals and phase signal;
(2) after judging synchronous engine cylinder success, calculate the oil spout phase place;
(3) calculate fuel injection pulsewidth and injection duration according to water temperature, rotating speed, load etc., in conjunction with oil spout phase place and reference fuel injection angle calculation oil spout start angle;
(4) judge according to the oil spout start angle whether all the other cylinders can in time finish oil spout except current synchronized cylinder;
(5) finish for the first time synchronously oil spout after, namely start end if motor can be finished startup, oil spout control enters idling oil spout control; If motor can not be finished startup and namely start and finish to judge and to be false, still continue to start oil spout control.Described motor is 4 Cylinder engines, and its step is as follows:
(1) synchronized cylinder is 1 cylinder or 4 cylinders, and is synchronous such as 1 cylinder, and then 1 cylinder is in compression stroke, 3 cylinders and is in that intake stroke, 4 cylinders are in exhaust stroke, 2 cylinders are in working stroke;
(2) according to firing order 1,3,4,2, calculate 3 cylinders and whether can in time finish oil spout, if can in time finish oil spout, then select the simultaneously oil spout of 3,4,2 three cylinders, oil spout phase place and fuel injection pulsewidth are identical with 1 cylinder;
(3) if 3 cylinders can not in time be finished oil spout, then select the simultaneously oil spout of 4,2 cylinders, oil spout phase place and fuel injection pulsewidth are identical with 1 cylinder.
When motor does not start successfully, then fuel injection pulsewidth is reasonably decayed according to the oil spout number of times of statistics in the follow-up start-up course, finishes until start.
Engine control system is counted the number of times of oil spout, and according to this oil spout number of times fuel injection pulsewidth is adjusted in real time.
Judge described in the step (1) synchronous engine cylinder number as engine control system according to the oil spout phase place, the fuel injection pulsewidth that detect, calculate first oil spout and carry out several cylinders and spray synchronously.
Compare with present prior art, the present invention combines sequence-injection and synchronous advantage of spraying in the current motor oil spout control, and the oil spout in the start-up course is carried out synchronous oil spout, order oil spout in conjunction with control.
Description of drawings
Fig. 1 is phase logic figure
Fig. 2 is that basic logic is controlled in first oil spout when starting
Embodiment
The below describes the present invention with reference to the accompanying drawings, and it is a kind of preferred embodiment in the numerous embodiments of the present invention.
The first step as shown in Figure 1, synchronous cylinder number is judged according to engine crankshaft signals and phase signal (1 tooth or 4 tooth phase places) by system, take 4 cylinder machines as example, synchronized cylinder is 1 cylinder or 4 cylinders.Such as 1 cylinder synchronously (4 cylinder syncsorts like), then 1 cylinder is in compression stroke, 3 cylinders and is in that intake stroke, 4 cylinders are in exhaust stroke, 2 cylinders are in working stroke.
Second step as shown in Figure 2, after declaring the cylinder success, begin to calculate the oil spout phase place, the oil spout phase place refer to relative compression top center the reference fuel injection angle (generally all take oil spout at the latest angle at the end as reference point), then be injection duration according to calculating fuel injection pulsewidths such as water temperature, rotating speed, loads, in conjunction with oil spout phase place and reference fuel injection angle calculation oil spout start angle.After finishing the calculating of oil spout start angle, judge according to the oil spout start angle whether all the other cylinders can in time finish oil spout except current synchronized cylinder, be that 1 cylinder is synchronous such as current synchronized cylinder, according to firing order 1,3,4,2, calculate 3 cylinders and whether can in time finish oil spout, if can in time finish oil spout, then select 3,4,2 three simultaneously oil spouts of cylinder, oil spout phase place and fuel injection pulsewidth are identical with 1 cylinder, if 3 cylinders can not in time be finished oil spout, then select 4, the simultaneously oil spout of 2 cylinders, oil spout phase place and fuel injection pulsewidth are identical with 1 cylinder.
The 3rd step, as shown in Figure 2, after finishing for the first time synchronously oil spout, namely start end if motor can be finished startup, then oil spout control enters idling oil spout control, namely starts and finishes to judge and be false if motor can not be finished startup, then still continue to start oil spout control, and fuel injection pulsewidth is reasonably decayed according to the oil spout number of times of statistics, the cylinder phenomenon occurs flooding to prevent start-up course, finishes until start.
The above has carried out exemplary description to the present invention by reference to the accompanying drawings; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present invention and technological scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (9)
1. method for controlling fuel injection when starting engine, adopt engine control system that oil sprayer is controlled, open the endurance by start-up time and the oil sprayer of control oil sprayer, carry out the control of fuel injection when starting engine, it is characterized in that, adopt following steps:
(1) engine control system is judged synchronous engine cylinder number according to engine crankshaft signals and phase signal;
(2) after judging synchronous engine cylinder success, calculate the oil spout phase place;
(3) calculate fuel injection pulsewidth and injection duration according to water temperature, rotating speed, load, in conjunction with oil spout phase place and reference fuel injection angle calculation oil spout start angle;
(4) judge according to the oil spout start angle whether all the other cylinders can in time finish oil spout except current synchronized cylinder;
(5) finish for the first time synchronously oil spout after, namely start end if motor can be finished startup, oil spout control enters idling oil spout control; Namely judge and be false if motor can not be finished startup, still continue to start oil spout control.
2. method for controlling fuel injection when starting engine as claimed in claim 1 is characterized in that, the start-up time of described control oil sprayer, and its fuel oil time for spraying that obtains according to monitoring for engine control system is determined the start-up time of this oil sprayer.
3. method for controlling fuel injection when starting engine as claimed in claim 1 or 2 is characterized in that, described oil sprayer is opened the endurance, and its fuel oil injection pulse width that obtains according to monitoring for engine control system is determined this oil sprayer unlatching endurance.
4. method for controlling fuel injection when starting engine as claimed in claim 2 is characterized in that, described fuel oil time for spraying and fuel oil ejection cylinder number detect the engine crankshaft signals and the phase signal that obtain according to engine control system and determine.
5. method for controlling fuel injection when starting engine as claimed in claim 3 is characterized in that, described fuel oil injection pulse width is determined according to the engine temperature that engine control system detects, and compensated according to the battery voltage that detects.
6. method for controlling fuel injection when starting engine as claimed in claim 1 is characterized in that, described motor is 4 Cylinder engines, and its step is as follows:
(1) synchronized cylinder is 1 cylinder or 4 cylinders, and is synchronous such as 1 cylinder, and then 1 cylinder is in compression stroke, 3 cylinders and is in that intake stroke, 4 cylinders are in exhaust stroke, 2 cylinders are in working stroke;
(2) according to firing order 1,3,4,2, calculate 3 cylinders and whether can in time finish oil spout, if can in time finish oil spout, then select the simultaneously oil spout of 3,4,2 three cylinders, oil spout phase place and fuel injection pulsewidth are identical with 1 cylinder;
(3) if 3 cylinders can not in time be finished oil spout, then select the simultaneously oil spout of 4,2 cylinders, oil spout phase place and fuel injection pulsewidth are identical with 1 cylinder.
7. method for controlling fuel injection when starting engine as claimed in claim 1 is characterized in that, when motor does not start successfully, then fuel injection pulsewidth is reasonably decayed according to the oil spout number of times of statistics in the follow-up start-up course, finishes until start.
8. method for controlling fuel injection when starting engine as claimed in claim 1 is characterized in that, engine control system is counted the number of times of oil spout, and according to this oil spout number of times fuel injection pulsewidth is adjusted in real time.
9. method for controlling fuel injection when starting engine as claimed in claim 1, it is characterized in that, judge described in the step (1) synchronous engine cylinder number as engine control system according to the oil spout phase place, the fuel injection pulsewidth that detect, calculate first oil spout and carry out several cylinders and spray synchronously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910184828 CN101694184B (en) | 2009-10-14 | 2009-10-14 | Method for controlling fuel injection when starting engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910184828 CN101694184B (en) | 2009-10-14 | 2009-10-14 | Method for controlling fuel injection when starting engine |
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| CN101694184A CN101694184A (en) | 2010-04-14 |
| CN101694184B true CN101694184B (en) | 2013-04-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102588134B (en) * | 2012-03-08 | 2014-03-12 | 潍柴动力股份有限公司 | Diesel engine injection control method and electric control diesel engine utilizing same |
| CN102678355B (en) * | 2012-05-04 | 2015-11-18 | 联合汽车电子有限公司 | Automobile oil injection control system and method |
| CN112128004A (en) * | 2020-09-22 | 2020-12-25 | 潍柴动力股份有限公司 | Control method, device and equipment for cold start of engine and storage medium |
| CN113482788A (en) * | 2021-07-30 | 2021-10-08 | 青驭汽车科技(太仓)有限公司 | Engine fuel multiple injection control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1830057A1 (en) * | 2004-12-14 | 2007-09-05 | Toyota Jidosha Kabushiki Kaisha | Fuel injection control device for internal combustion engine |
| CN101061300A (en) * | 2005-01-13 | 2007-10-24 | 丰田自动车株式会社 | Start control apparatus for internal combustion engine |
| CN101427015A (en) * | 2006-09-22 | 2009-05-06 | 丰田自动车株式会社 | Fuel injection control device of internal combustion engine |
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2009
- 2009-10-14 CN CN 200910184828 patent/CN101694184B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1830057A1 (en) * | 2004-12-14 | 2007-09-05 | Toyota Jidosha Kabushiki Kaisha | Fuel injection control device for internal combustion engine |
| CN101061300A (en) * | 2005-01-13 | 2007-10-24 | 丰田自动车株式会社 | Start control apparatus for internal combustion engine |
| CN101427015A (en) * | 2006-09-22 | 2009-05-06 | 丰田自动车株式会社 | Fuel injection control device of internal combustion engine |
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| CN101694184A (en) | 2010-04-14 |
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