CN102434295A - Drive waveform control method of fuel pump of electric control common-rail diesel engine - Google Patents
Drive waveform control method of fuel pump of electric control common-rail diesel engine Download PDFInfo
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- CN102434295A CN102434295A CN2011104231393A CN201110423139A CN102434295A CN 102434295 A CN102434295 A CN 102434295A CN 2011104231393 A CN2011104231393 A CN 2011104231393A CN 201110423139 A CN201110423139 A CN 201110423139A CN 102434295 A CN102434295 A CN 102434295A
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Abstract
The invention discloses a drive waveform realizing method of a fuel pump of an electric control common-rail diesel engine. Drive current waveform of the fuel pump of the electric control common-rail system is generated through an engine ECU (Electronic Control Unit). Parameters of improving current duration, fuel supply advance angle, current switch delay time, maintaining current square wave quantity and maintaining current square wave high-level duration and maintaining current square wave low-level duration are regulated by using software so that the drive waveform of the fuel pump of the electric control common-rail diesel engine is generated.
Description
Technical field
The present invention relates to a kind of electric-controlled co-rail diesel engine fuel oil pump drive waveforms controlling method, be used for electric-controlled co-rail diesel engine fuel oil pump control field, especially use the oil-fired system form of electronically controlled unit pump as common rail system intermediate fuel oil pump.
Background technique
At present, because the high pressure oil pump in the conventional high-tension common rail system needs higher production technology, therefore receive the monopolization of foreign vendor always; Cause existing high-pressure common rail technology to be promoted at home slowly,, be based on domestic ripe relatively electronically controlled unit pump system to this present situation; Existing a kind of common rail form of utilizing electronically controlled unit pump as diesel engine high-pressure co-rail system mesohigh pump; It is low that this high pressure co-rail system has a cost, and the advantage that reliability is high needs special current waveform to come it is controlled (tradition rail pump does not altogether need very complicated Current Control waveform) but the problem that mainly faces is an electronically controlled unit pump; The quality of current waveform directly influences the performance and the stability of electronically controlled unit pump; Because the control current waveform of electronically controlled unit pump is generally realized by the Engine ECU hardware circuit, is example with 6 cylinder machines, in the middle of the electronically controlled unit pump system; Only needing 6 Current Control passages controls 6 electronically controlled unit pumps and can realize oil spout; And in the middle of common rail system, for the ECU hardware circuit, needing 6 Current Control passages carries out the control of oil sprayer, if use electronically controlled unit pump then need two extra Current Control passages to come monoblock pump is controlled; The passage that then carries out Current Control has been increased to 8, has so then greatly increased the cost and the design difficulty of ECU hardware circuit.
Summary of the invention
To above-mentioned prior art problems; The object of the present invention is to provide a kind of electric-controlled co-rail diesel engine fuel oil pump drive waveforms controlling method, it uses special software control module, and control mode is more flexible; Can not change original common rail system hardware output pin; Take into account the control of traditional common rail system fuel pump and new electronic control monoblock pump type common-rail fuel pump simultaneously, solve hardware and produce the cost of control waveform generation and the problem of technical difficulty, reliability is high.
Technological scheme of the present invention is achieved in that a kind of electric-controlled co-rail diesel engine fuel oil pump drive waveforms controlling method; It is characterized in that: when the fuel pump solenoid valve has demand for control; Through software control module compute control parameter; And by the output of the TPU module in ECU central processing unit control signal, concrete steps are:
1) according to the total duration of present engine operating conditions calculating fuel pump solenoid valve need of work, this endurance is relevant with the working load of current oil pump, and when needing bigger fuel delivery, then ECU output is than long control signal;
2) calculate the fuel pump solenoid valve and open required lifting current duration, it is relevant with the battery voltage of solenoid valve temperature and current system to promote current duration, confirms according to the fuel pump solenoid valve characteristic under different temperature and the battery voltage;
3) calculate current switching retard time, guarantee after the fuel pump solenoid valve arrives the top of lift, in time to switch to and keep the Current Control stage;
4) calculate the relevant Control Parameter of keeping electric current; Comprise through calculating and keep electric current square wave quantity, keep electric current square wave high level lasting time, keep electric current square wave low duration; According to the electric properties under different temperatures, battery voltage of fuel pump solenoid valve, confirm to keep the information such as control cycle, frequency, dutycycle of electric current;
5) obtain the calculating of above-mentioned parameter after; Utilize the TPU module output current control waveform in the ECU central processing unit; In whole software control module running; Can real-time demand for control be adjusted by above-mentioned parameter, guarantee the accurate control requirement of fuel pump according to present engine working state and high pressure oil pump.
Its controlling method of good effect of the present invention is more flexible; Realized not changing the control that takes into account traditional common rail system fuel pump and new electronic control monoblock pump type common-rail fuel pump on the basis of original common rail system hardware output pin simultaneously; Saved the cost increase that ECU hardware change itself brings; Prior be to use the electronically controlled unit pump formula altogether the rail fuel pump compare domestic present common rail system and have cost low, practical significances such as reliability height.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is an ECU control fuel pump drive waveforms comparison diagram of the present invention.
Fig. 3 is an electronically controlled unit pump common rail system fuel pump software-driven waveform unfolded drawing.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description:
Embodiment 1
As shown in Figure 1; A kind of electric-controlled co-rail diesel engine fuel oil pump drive waveforms controlling method is characterized in that: when the fuel pump solenoid valve has demand for control, through software control module compute control parameter; And by the output of the TPU module in ECU central processing unit control signal, concrete steps are:
1) according to the total duration of present engine operating conditions calculating fuel pump solenoid valve need of work, this endurance is relevant with the working load of current oil pump, and when needing bigger fuel delivery, then ECU output is than long control signal;
2) calculate the fuel pump solenoid valve and open required lifting current duration, it is relevant with the battery voltage of solenoid valve temperature and current system to promote current duration, confirms according to the fuel pump solenoid valve characteristic under different temperature and the battery voltage;
3) calculate current switching retard time, guarantee after the fuel pump solenoid valve arrives the top of lift, in time to switch to and keep the Current Control stage;
4) calculate the relevant Control Parameter of keeping electric current; Comprise through calculating and keep electric current square wave quantity, keep electric current square wave high level lasting time, keep electric current square wave low duration; According to the electric properties under different temperatures, battery voltage of fuel pump solenoid valve, confirm to keep the information such as control cycle, frequency, dutycycle of electric current;
5) obtain the calculating of above-mentioned parameter after; Utilize the TPU module output current control waveform in the ECU central processing unit; In whole software control module running; Can real-time demand for control be adjusted by above-mentioned parameter, guarantee the accurate control requirement of fuel pump according to present engine working state and high pressure oil pump.Pin is the fuel pump control end, is sent the current waveform of control fuel pump by these two pins.
As shown in Figure 2; When the oil pump solenoid valve need be opened; Software control module can be through TPU (time processing unit) the control output pin output control signal (like accompanying drawing 3) of ECU central processing unit, and in the lifting current duration stage of whole software control waveform, the solenoid valve of fuel pump is opened by the electromagnetic force effect; Keep current phase at current switching after endurance; Keep the size of electric current through control, what guarantee that the fuel pump solenoid valve can continue is held open, thereby guarantees the fuel delivery function of oil pump.
For example: when full engine load is worked, need fuel pump to work, this moment, fuel pump need guarantee the supply of maximum oil mass with its whole pressures oil stroke with all strength; Because the pressure of cam of injection pump oil stroke is 120 degree, so this patent software control module can calculate parameters such as oil pump control cumulative times according to current engine speed, it is 9523us that 120 degree are pressed oily stroke corresponding control time when motor 2100 changes; After obtaining the master control time; Deduct the retard time (300us) of corresponding opening time of solenoid valve characteristic under the current working (this parameter confirms that by test under the normal temperature, the 28V battery voltage is greatly about 750us) and current switching with the master control time; Obtain the time that solenoid valve open to keep (9523us – 750us – 300us=8473us); The retention time of 8473us is modulated (this parameter confirms that through test under the normal temperature, the 28V battery voltage approximately needs the output of 25% dutycycle) according to parameters such as the corresponding dutycycle of current working, frequencies; Final controlled advance angle is 120 degree; Total duration is 9523us, and the lifting current time is 750us, and the current switching time is 300us; Keep electric current square wave quantity 2000; Keep electric current high level lasting time 1.06us, keep the control waveform parameter of electric current square wave low duration 3.18us, export according to above-mentioned parameter control through the TPU processing unit in the ECU central processing unit (CPU).
In like manner, when engine idle is worked, do not need fuel pump to work with all strength; This moment, fuel pump need not use whole pressure oil strokes, and under stable idling operation, general 30 degree that only need use are pressed oily stroke; So it is 6250us that 30 degree are pressed oily stroke corresponding control time when motor 800 changes, in that obtain must be after the control time, (this parameter is confirmed by test to deduct under the current working the corresponding opening time of solenoid valve characteristic with total duration; Under the normal temperature, the 28V battery voltage is greatly about 750us) and 300us retard time of current switching, obtain solenoid valve and open time of keeping (6350us – 750us – 300us=5200us); The retention time of 5200us is modulated (this parameter confirms that through test under the normal temperature, the 28V battery voltage approximately needs the output of 25% dutycycle) according to parameters such as the corresponding dutycycle of current working, frequencies; Final controlled advance angle is 30 degree; Total duration is 6350us, and the lifting current time is 750us, and the current switching time is 300us; Keep electric current square wave quantity 1000; Keep electric current high level lasting time 1.3us, keep the control waveform parameter of electric current square wave low duration 3.9us, export according to above-mentioned parameter control through the TPU processing unit in the ECU central processing unit (CPU).
As shown in Figure 3, traditional control method and controlling method parameter comparison of the present invention see the following form:
The fuel pump that on the CA6DL2-35E3 motor, uses electric-controlled co-rail diesel engine fuel oil pump software-driven waveform display method to drive; The pump box that use is equipped with two monoblock pumps comes in fuel rail, to provide high pressure fuel, replaces former rail high pressure oil pump altogether that fuel oil is provided in fuel rail thereby Control Parameter such as use software programmable waveform adjustment lifting current duration reach accurate control monoblock pump.
As shown in Figure 2; The fuel pump software-driven current waveform that actual acquisition obtains when working for oil pump; Purple is that driving voltage (24V) pink colour is a driving current, and its technical characteristics is for through to the generation that promotes current duration, fuel supply advance angle, current switching retard time, keeps electric current square wave quantity, keeps electric current square wave high level lasting time, the adjusting of keeping six parameters of electric current square wave low duration realizes drive waveforms.
In the present invention; Can guarantee that the control system hardware circuit is identical with traditional common rail electric-controlled system; Even do not change for the control pin number of fuel pump yet; Just on pin control output form, control the low side output form by common low side output becoming software programmable, the advantage of automatical control system general arrangement is not change original automatical control system definition, wire harness and relevant sensor like this, only needs to use the software control drive waveforms to get final product.
Electronically controlled unit pump altogether rail fuel pump control needs the current duration of control lifting simultaneously, fuel supply advance angle, current switching retard time, keeps electric current square wave quantity, keeps electric current square wave high level lasting time, keeps six parameters of electric current square wave low duration; Can change electronically controlled unit pump rail fuel pump control waveform altogether through adjusting above-mentioned six parameters, fuel oil is provided in fuel rail thereby reach accurate control fuel pump.
Claims (3)
1. electric-controlled co-rail diesel engine fuel oil pump software-driven waveform implementation method; Realize the generation of electric-controlled co-rail system fuel pump drive current waveform through Engine ECU; It is characterized in that: non-hardware is directly realized final controlling element control current waveform, but the mode of utilizing the software-driven electric current is to the generation that promotes current duration, fuel supply advance angle, current switching retard time, keeps electric current square wave quantity, keeps electric current square wave high level lasting time, the adjusting of keeping six parameters of electric current square wave low duration realizes drive waveforms.
2. electric-controlled co-rail diesel engine fuel oil pump software-driven waveform implementation method according to claim 1, it is characterized in that: the software-driven electric current is realized the adjusting of six driving parameters in the drive waveforms through TUP in the processor or ETUP module.
3. electric-controlled co-rail diesel engine fuel oil pump software-driven waveform implementation method according to claim 1 is characterized in that six driving parameters all can adjust within the specific limits flexibly, produces suitable driving current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110423139 CN102434295B (en) | 2011-12-16 | 2011-12-16 | Drive waveform control method of fuel pump of electric control common-rail diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110423139 CN102434295B (en) | 2011-12-16 | 2011-12-16 | Drive waveform control method of fuel pump of electric control common-rail diesel engine |
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| CN102434295A true CN102434295A (en) | 2012-05-02 |
| CN102434295B CN102434295B (en) | 2013-08-14 |
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| CN 201110423139 Expired - Fee Related CN102434295B (en) | 2011-12-16 | 2011-12-16 | Drive waveform control method of fuel pump of electric control common-rail diesel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275699A (en) * | 2015-11-07 | 2016-01-27 | 镇江恒驰科技有限公司 | Method for calibrating electronic control common-rail oil pump test bench |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6868832B2 (en) * | 2003-07-09 | 2005-03-22 | Honda Motor Co., Ltd. | Electronic controlled fuel injection apparatus of internal combustion engine |
| CN101372919A (en) * | 2008-09-02 | 2009-02-25 | 北京理工大学 | An electronic control unit suitable for diesel engine electronically controlled high-pressure common rail injection system |
| CN101929401A (en) * | 2006-04-11 | 2010-12-29 | 浙江飞亚电子有限公司 | Drive control device of electromagnetic fuel pump nozzle |
-
2011
- 2011-12-16 CN CN 201110423139 patent/CN102434295B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6868832B2 (en) * | 2003-07-09 | 2005-03-22 | Honda Motor Co., Ltd. | Electronic controlled fuel injection apparatus of internal combustion engine |
| CN101929401A (en) * | 2006-04-11 | 2010-12-29 | 浙江飞亚电子有限公司 | Drive control device of electromagnetic fuel pump nozzle |
| CN101372919A (en) * | 2008-09-02 | 2009-02-25 | 北京理工大学 | An electronic control unit suitable for diesel engine electronically controlled high-pressure common rail injection system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275699A (en) * | 2015-11-07 | 2016-01-27 | 镇江恒驰科技有限公司 | Method for calibrating electronic control common-rail oil pump test bench |
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