CN103397963B - A kind of oily rail pressure quick pressure releasing controlling method and electronic control system - Google Patents
A kind of oily rail pressure quick pressure releasing controlling method and electronic control system Download PDFInfo
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- CN103397963B CN103397963B CN201310354911.XA CN201310354911A CN103397963B CN 103397963 B CN103397963 B CN 103397963B CN 201310354911 A CN201310354911 A CN 201310354911A CN 103397963 B CN103397963 B CN 103397963B
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Abstract
The invention discloses a kind of oily rail pressure quick pressure releasing controlling method and electronic control system, wherein controlling method comprises: judge whether satisfied clearance condition, if so, then calculates the rail pressure difference between rail pressure actual value and rail pressure setting value; And judge rail pressure difference whether superthreshold, if so, then judge whether motor is in further and fall the rail pressure stage, if not, then finishing control; If judge, motor is in falls the rail pressure stage, then enter and fall rail pressure modification model, if not, then and finishing control; The described every cylinder dynamic leakage number of times falling rail pressure modification model and determine according to engine operating condition to increase, and by controlling fuel injector magnetic system with minimum power-up time action, perform dynamic leakage, increase oil sprayer dynamic leakage amount, rail pressure is reduced rapidly.The method can realize electronic control system when sudden load rail pressure setting value bust, and rail pressure actual value can reduce rapidly, and its desirable rail pressure followability can significantly improve the safety and stability of motor.
Description
Technical field
The present invention relates to technical field of engines, particularly can realize the controlling method of the oily rail pressure quick pressure releasing of diesel engine electronic control system.The invention still further relates to the electronic control system adopting described controlling method.
Background technique
Existing motor adopts electronic control system mostly, and it can realize stable jet pressure and fuel injection characteristic flexibly by pressure accumulation mode, ensures the quality of mixed gas, reach good Economy and discharge with this.
Please refer to Fig. 1, Fig. 2, Fig. 1 is the oil circuit schematic diagram of electronic control system; Fig. 2 is the sectional view of electric-controlled fuel injector.
As shown in the figure, electronic control system is the device realizing the foundation of diesel engine fuel oil pressure, high pressure storage, fuel oil injection and provide control, comprise the large critical piece of Electrocontrolled high-pressure oil pump 1, common rail pipe 2, electric-controlled fuel injector 3 and ECU tetra-, oil rail pressure refers to the pressure in common rail pipe 2, hereinafter referred to as rail pressure.
Electric-controlled fuel injector 3 realizes the carrier that fuel injection amount and injection timing accurately control, the gap that in oil sprayer, movement parts exists as needle-valve 31, ball valve 32 etc. and oil injector body and the leakage of the high pressure fuel brought is called oil sprayer static leakage.After oil sprayer coil 33 is energized, armature 34 moves upward, ball valve 32 rises, and the high pressure oil in it is communicated with the oil circuit of low pressure oil, and now, the leakage that fuel oil flows through release control hole 35 generation is called oil sprayer dynamic leakage.
Low pressure oil becomes after high pressure oil through high pressure oil pump 1 and enters common rail pipe 2, and high pressure oil controlled quentity controlled variable is determined by the aperture of fuel gauging unit on oil pump, thus ensures that in common rail pipe, rail pressure actual value follows rail pressure setting value.When meeting accident (rail pressure uncontrollable or mechanical failure etc.) and after causing rail pressure actual value to exceed certain threshold value, the mechanical pressure release valve 4 being connected in common rail pipe one end is opened, thus protection common rail pipe 2 can not damage due to too high pressure.
When motor requires that suddenly oily rail pressure declines rapidly, the pressure release speed separately through closedown fuel gauging unit is inadequate.Such as produce the rapid pressure release of error requirement oil rail inner high voltage fuel oil etc. when gas pedal discharges rapidly with ECU, the speed of pressure release in this case seems particularly important.
In electronic control system rail pressure control mainly through the aperture of proportional electromagnetic valve on adjusting oil mass batching unit regulate enter fuel delivery in common rail pipe number, thus reach the object controlling rail pressure.This control mode achieves good rail pressure followability under stable state and transient state rail pressure rising condition, but followability is undesirable in transient state rail pressure decline situation.
Please refer to Fig. 3, Fig. 3 be rail pressure actual value and setting value follow curve.
As can be seen from the figure, when rail pressure setting value rises, the speed of following of rail pressure actual value is within the scope of acceptable.But when unclamping gas pedal or ECU system reports an error, when requiring that rail pressure declines rapidly, the speed of following of rail pressure actual value is very slow.
Its reason is, electronic control system regulates by the aperture of proportional electromagnetic valve on adjusting oil mass batching unit the number entering fuel delivery in oily rail.When rail pressure setting value rises rapidly, it is large that solenoid valve aperture becomes the quantitative change of ambassador's fuel feeding, and rail pressure can realize following fast; And when rail pressure setting value declines rapidly, although now solenoid valve aperture diminishes and makes fuel delivery diminish, but still there is higher pressure in common rail pipe, the reduction of rail pressure can only be realized by the static leakage of oil sprayer, and static leakage amount is limited in the short time, thus when causing rail pressure setting value bust, rail pressure actual value declines comparatively slow, thus greatly can affect the safety and stability of motor.
Therefore, those skilled in the art need badly and solve electronic control system rail pressure actual value decline when sudden load rail pressure setting value bust this technical problem comparatively slow.
Summary of the invention
The first object of the present invention is to provide a kind of oily rail pressure quick pressure releasing controlling method.The method can realize electronic control system when sudden load rail pressure setting value bust, and rail pressure actual value can reduce rapidly, and its desirable rail pressure followability can significantly improve the safety and stability of motor.
The second object of the present invention is to provide a kind of electronic control system adopting described controlling method.
To achieve these goals, the invention provides a kind of oily rail pressure quick pressure releasing controlling method, comprising:
Judge whether satisfied clearance condition, if so, then calculate the rail pressure difference between rail pressure actual value and rail pressure setting value; And
Judge rail pressure difference whether superthreshold, if so, then judge whether motor is in further and fall the rail pressure stage, if not, then finishing control;
If judge, motor is in falls the rail pressure stage, then enter and fall rail pressure modification model, if not, then and finishing control;
The described every cylinder dynamic leakage number of times falling rail pressure modification model and determine according to engine operating condition to increase, and by controlling fuel injector magnetic system with minimum power-up time action, perform dynamic leakage, increase oil sprayer dynamic leakage amount, rail pressure is reduced rapidly.
Preferably, also comprise:
Perform once in whole injection, continue monitoring rail pressure actual value, and perform and calculate the rail pressure difference between rail pressure actual value and rail pressure setting value and each step afterwards thereof, until rail pressure difference is less than finishing control after threshold value.
Preferably, wherein, judge whether that satisfied clearance condition comprises:
By judging under current working whether gas pedal is in rapid releasing state and/or ECU produces the rapid pressure release state of error requirement oil rail inner high voltage fuel oil, thus the rapid pressure release of oily rail pressure that determines whether to let pass controls.
Preferably, wherein, judge whether motor is in fall the rail pressure stage and comprise and judge whether rail pressure control is in closed loop states.
Preferably, wherein, determine that the every cylinder dynamic leakage number of times increased comprises according to engine operating condition:
Determine current injecting times, every cylinder dynamic leakage number of times that can increase obtain current working after allowing injecting times to carry out mathematic interpolation with oil sprayer under.
Preferably, wherein, minimum power-up time refers to that fuel injector magnetic system powers up, and oil sprayer can carry out dynamic leakage and just without the time of fuel injection quantity.
Preferably, described minimum power-up time makes the ball valve of oil sprayer lift and takes a seat when needle-valve is about to lift.
Preferably, wherein, comprise with minimum power-up time action by controlling fuel injector magnetic system:
Using the injection advance angle of setting and minimum power-up time to drive oil sprayer successively by diesel engine firing order, increasing oil sprayer dynamic leakage number of times when completing normal injection.
Preferably, comprise further:
When oil sprayer allows injecting times all to open, ensure that the current injecting times that motor normally runs has been used for high pressure fuel injection process, for motor provides power, dynamic leakage injecting times is then for increasing the dynamic leakage amount of oil sprayer.
For realizing above-mentioned second object, the invention provides a kind of electronic control system, comprise Electrocontrolled high-pressure oil pump, common rail pipe, electric-controlled fuel injector and controller, described controller adopts the oily rail pressure quick pressure releasing controlling method described in above-mentioned any one to control the oily rail pressure of described common rail pipe.
The present invention, on existing control logic basis, provides a kind of dynamic leakage based on oil sprayer to reduce the controlling method of rail pressure fast.Under judging current working, gas pedal whether is in rapid releasing state and/or ECU produces the rapid pressure release state of error requirement oil rail inner high voltage fuel oil, thus judges whether the rapid pressure release control of oily rail pressure of letting pass.When letting pass, judge the difference of rail pressure setting value and actual value, judge whether present engine is in and fall the rail pressure stage, then enter when the condition is satisfied and fall rail pressure modification model, otherwise exiting, falling in rail pressure modification model, first determining current injecting times, every cylinder dynamic leakage number of times that can increase obtain current working after carrying out mathematic interpolation with permission injecting times under, increases oil sprayer dynamic leakage amount by controlling fuel injector magnetic system with minimum power-up time action.Because the high pressure fuel entered in the oil-filled control mouth of oil sprayer constantly lets out oil sump tank, in common rail pipe, rail pressure actual value also can decrease, thus reaches the object reducing rapidly rail pressure.
Electronic control system provided by the invention adopts above-mentioned controlling method to control the oily rail pressure of its common rail pipe, because controlling method has above-mentioned technique effect, therefore adopts the electronic control system of this controlling method also should possess corresponding technique effect.
Accompanying drawing explanation
Fig. 1 is the oil circuit schematic diagram of electronic control system;
Fig. 2 is the sectional view of electric-controlled fuel injector;
Fig. 3 be rail pressure actual value and setting value follow curve;
Fig. 4 is the control logic block diagram of oily rail pressure quick pressure releasing controlling method provided by the present invention.
In figure:
1. Electrocontrolled high-pressure oil pump 2. common rail pipe 3. electric-controlled fuel injector 4. Decompression valves 31. needle-valve 32. ball valve 33. coil 34. armature 35. release control hole 36. spray orifice
Embodiment
Core of the present invention solves electronic control system when sudden load rail pressure setting value bust, the problem that the decline of rail pressure actual value is slower, its basic scheme be existing main flow, with oil sprayer static leakage to realize when rail pressure setting value reduces on the actual value electronic control system platform of following, utilize fuel injector magnetic system with the repeatedly quick acting of minimum power-up time, increase the dynamic leakage of oil sprayer place fuel oil, realize common rail pipe fuel pressure and reduce rapidly.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 4, Fig. 4 is the control logic block diagram of oily rail pressure quick pressure releasing controlling method provided by the present invention.
In a kind of embodiment, oily rail pressure quick pressure releasing controlling method provided by the invention, comprises the following steps:
First, satisfied oily rail pressure quick pressure releasing controlling method clearance condition is judged whether.
By judging under current working whether gas pedal is in rapid releasing state (rail pressure value is greater than calibration value) and/or ECU produces the rapid pressure release state of error requirement oil rail inner high voltage fuel oil, thus the rapid pressure release of oily rail pressure that determines whether to let pass controls.
If the determination result is YES, then meet clearance condition, start the rail pressure difference calculated between rail pressure actual value and rail pressure setting value, rail pressure setting value to be tabled look-up the current optimal control rail pressure drawn according to different operating mode (rotating speed and oil mass), and rail pressure actual value is actual pressure in the current common rail pipe that obtained by the rail pressure sensor sampling on common rail pipe.
Then, judge rail pressure difference whether superthreshold, if so, then judge whether motor is in further and fall the rail pressure stage, if not, then quit a program, finishing control.Rail pressure difference and setting threshold value are compared, when rail pressure difference is greater than threshold value, then think that the deviation of current rail pressure is excessive, rail pressure actual value can not follow rail pressure setting value well, needs to reduce rail pressure rapidly.
Then, if judge, motor is in falls the rail pressure stage, then enter and fall rail pressure modification model, if not, then quit a program, finishing control.
Particularly, if judge, rail pressure control is in closed loop states, then think that motor is in and fall the rail pressure stage, because only have the dynamic following that just can require rail pressure setting value and rail pressure actual value when rail pressure control is in closed loop states.When rail pressure control is in open loop situations (as " limp-home " etc.), the output of rail pressure actual value based on current actual conditions, and has nothing to do with setting value.Therefore, only at closed loop states and rail pressure difference exceedes threshold value time, just can run and fall rail pressure modification model.
Above-mentioned " limp-home " is a kind of special pattern for engine design, when damaging appears in engine sensor, when controller finds that data are abnormal, trouble light is reported to the police on the one hand, sensing data is replaced, vehicle can as usual be travelled to overhauling place, due to for normal mode of operation on the one hand with a constant band, performance is slightly poor, is therefore called visually " limp-home ".
Enter after falling rail pressure modification model, two stages can be divided into:
First stage, detect current spray regime.
According to present engine operating mode, determine the spray regime of oil sprayer.Implementation method determines current injecting times, after allowing injecting times to carry out mathematic interpolation with oil sprayer, and every cylinder dynamic leakage number of times that can increase under judging to obtain current working.
Electronic control system all can realize multiple fuel injection process to every cylinder, mainly contains main jet, pre-spray and rear spray.For once, the number of times of pre-spray and rear spray determines whether to let pass according to motor current working usual main jet, oil sprayer permission injecting times can realize 5 times even more, when ECU develops, its concrete quantity is determined by engine performance.
Such as, if the oil sprayer of motor allows injecting times to be 5 times, current injecting times is 3 times, then, after carrying out mathematic interpolation, every cylinder dynamic leakage number of times that can increase under obtaining current working is 2 times, by that analogy.
Second stage, performs dynamic leakage.
After completing the monitoring of current spray regime, use the injection advance angle of setting and minimum power-up time to drive oil sprayer successively by diesel engine firing order, be issued to the object increasing oil sprayer dynamic leakage number of times in the situation completing normal injection.
When allowing injecting times all to open, ensure that the current injecting times that motor normally runs has been used for high pressure fuel injection process, for motor provides power; Dynamic leakage injecting times is then for increasing the dynamic leakage amount of oil sprayer, and its implementation controls fuel injector magnetic system to work with minimum power-up time, performs dynamic leakage, increase oil sprayer dynamic leakage amount, rail pressure is reduced rapidly.
Minimum power-up time refers to that fuel injector magnetic system powers up, and oil sprayer can carry out dynamic leakage and just without the time of fuel injection quantity, from spool action, this power-up time can make the ball valve of oil sprayer lift and take a seat when needle-valve is about to lift.So both can realize the dynamic leakage of oil sprayer, rail pressure is reduced rapidly, can ensure again oil sprayer not injected fuel enter in cylinder, thus do not affect performance and the discharge of engine calibration.
Finally, carry out rail pressure actual value feedback monitoring, perform once in whole injection, continue monitoring rail pressure actual value, and perform and calculate the rail pressure difference between rail pressure actual value and rail pressure setting value and each step afterwards thereof, namely with rail pressure actual value for feedback parameter, with rail pressure setting value for control objectives carries out closed loop control, until rail pressure difference is less than threshold value backed off after random program, finishing control.
The present invention utilizes permission injecting times and the spray regime of oil sprayer self, the every cylinder dynamic leakage number of times increased under judging to obtain current working, the minimum power-up time of setting is used to drive oil sprayer successively, realize the object increasing oil sprayer dynamic leakage, high pressure fuel is from oil circuit pressure release, rail pressure is reduced rapidly, real-time online improve rail pressure setting value bust time actual value transient state follow slower problem.
Another advantage of the present invention is that its implementation takes full advantage of existing control logic, only need increase part control program, and need not carry out hardware modifications, effectively control the costs such as R & D Cost.
Certainly, above-mentioned oily rail pressure quick pressure releasing controlling method is only preferred version of the present invention, is specifically not limited thereto, can makes pointed adjustment according to actual needs on this basis, thus obtain different mode of executions.Because mode in the cards is more, just illustrate no longer one by one here.
Except above-mentioned controlling method, the present invention also provides a kind of electronic control system, comprise Electrocontrolled high-pressure oil pump, common rail pipe, electric-controlled fuel injector and controller, wherein, controller adopts oily rail pressure quick pressure releasing controlling method mentioned above to control the oily rail pressure of common rail pipe, all the other structures please refer to prior art, repeat no more herein.
Above oily rail pressure quick pressure releasing controlling method provided by the present invention and electronic control system are described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands core concept of the present invention for helping.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 improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (7)
1. an oily rail pressure quick pressure releasing controlling method, comprising:
Judge whether satisfied clearance condition, if so, then calculate the rail pressure difference between rail pressure actual value and rail pressure setting value; And
Judge rail pressure difference whether superthreshold, if so, then judge whether motor is in further and fall the rail pressure stage, if not, then finishing control;
If judge, motor is in falls the rail pressure stage, then enter and fall rail pressure modification model, if not, then and finishing control;
The described every cylinder dynamic leakage number of times falling rail pressure modification model and determine according to engine operating condition to increase, and by controlling fuel injector magnetic system with minimum power-up time action, perform dynamic leakage, increase oil sprayer dynamic leakage amount, rail pressure is reduced rapidly;
Perform once in whole injection, continue monitoring rail pressure actual value, and perform and calculate the rail pressure difference between rail pressure actual value and rail pressure setting value and each step afterwards thereof, until rail pressure difference is less than finishing control after threshold value;
Wherein, judge whether that satisfied clearance condition comprises:
By judging under current working whether gas pedal is in rapid releasing state and/or ECU produces the rapid pressure release state of error requirement oil rail inner high voltage fuel oil, thus the rapid pressure release of oily rail pressure that determines whether to let pass controls;
Judge whether motor is in fall the rail pressure stage and comprise and judge whether rail pressure control is in closed loop states.
2. oily rail pressure quick pressure releasing controlling method according to claim 1, wherein, determine that the every cylinder dynamic leakage number of times increased comprises according to engine operating condition:
Determine current injecting times, every cylinder dynamic leakage number of times that can increase obtain current working after allowing injecting times to carry out mathematic interpolation with oil sprayer under.
3. oily rail pressure quick pressure releasing controlling method according to claim 1, wherein, minimum power-up time refers to that fuel injector magnetic system powers up, and oil sprayer can carry out dynamic leakage and without time of fuel injection quantity.
4. oily rail pressure quick pressure releasing controlling method according to claim 3, described minimum power-up time makes the ball valve action of oil sprayer and needle-valve is failure to actuate.
5. oily rail pressure quick pressure releasing controlling method according to claim 1, wherein, comprises with minimum power-up time action by controlling fuel injector magnetic system:
Using the injection advance angle of setting and minimum power-up time to drive oil sprayer successively by diesel engine firing order, increasing oil sprayer dynamic leakage number of times when completing normal injection.
6. oily rail pressure quick pressure releasing controlling method according to claim 5, comprises further:
When oil sprayer allows injecting times all to open, the current injecting times that motor normally runs has been used for high pressure fuel injection process, and for motor provides power, dynamic leakage injecting times is then for increasing the dynamic leakage amount of oil sprayer.
7. an electronic control system, comprises Electrocontrolled high-pressure oil pump, common rail pipe, electric-controlled fuel injector and controller, it is characterized in that,
Described controller adopts the oily rail pressure quick pressure releasing controlling method described in any one of the claims 1 to 6 to control the oily rail pressure of described common rail pipe.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103696864B (en) * | 2013-12-06 | 2016-06-08 | 潍柴动力股份有限公司 | The control method of a kind of high pressure co-rail system and device |
| CN104863767B (en) * | 2014-12-18 | 2017-09-15 | 北汽福田汽车股份有限公司 | It is a kind of can quick pressure releasing high-pressure concentrator and quick pressure releasing method |
| CN105257418B (en) * | 2015-10-27 | 2018-07-03 | 潍柴动力股份有限公司 | A kind of fuel oil injection control method |
| CN105840332B (en) * | 2016-05-31 | 2018-12-25 | 攀枝花学院 | Electric-control common-rail type diesel injection system |
| CN108757253B (en) * | 2018-05-31 | 2021-02-23 | 广西玉柴机器股份有限公司 | Method for judging consistency of oil injectors |
| CN108798956B (en) * | 2018-06-13 | 2020-09-08 | 中国北方发动机研究所(天津) | Control oil way structure of common rail oil injector |
| CN109630301A (en) * | 2018-12-11 | 2019-04-16 | 潍柴动力股份有限公司 | A kind of control method and device of the injection of No leakage fuel injector sky |
| CN109695511B (en) * | 2019-02-21 | 2024-01-09 | 重油高科电控燃油喷射系统有限公司 | Common rail fuel injection system of multi-cylinder engine |
| CN110185546B (en) * | 2019-05-20 | 2021-12-14 | 苏州国方汽车电子有限公司 | Rail pressure releasing method and device for common rail fuel system of static oil return-free engine |
| CN110954319B (en) * | 2019-12-20 | 2021-11-19 | 潍柴动力股份有限公司 | Injection valve fault monitoring method and device |
| CN113464302B (en) * | 2021-07-29 | 2022-08-16 | 一汽解放汽车有限公司 | Shutdown pressure relief control method and control device for fuel system |
| CN113586302A (en) * | 2021-07-29 | 2021-11-02 | 北京工业大学 | Method for detecting valve tightness based on pressure drop characteristics |
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