CN103114918B - A kind of electronic control multi-cylinder engine starting method and device - Google Patents
A kind of electronic control multi-cylinder engine starting method and device Download PDFInfo
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- CN103114918B CN103114918B CN201210580029.2A CN201210580029A CN103114918B CN 103114918 B CN103114918 B CN 103114918B CN 201210580029 A CN201210580029 A CN 201210580029A CN 103114918 B CN103114918 B CN 103114918B
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Abstract
The embodiment of the present application discloses a kind of electronic control multi-cylinder engine starting method.The method comprises: when not obtaining the signal that camshaft-signal sensor provides, and obtains the first phase residing for motor by crankshaft sensor; Mate the second phase residing for motor when previous engine that described first phase and electronic control unit (ECU) store quits work, if can mate, then the current phase place residing for first phase or second phase determination motor; Current phase place ato unit residing for motor.The embodiment of the present application also discloses a kind of electronic control multi-cylinder engine starting drive.The embodiment of the present application more adequately can determine phase place, improves engine start efficiency.
Description
Technical field
The application relates to technical field of engines, particularly relates to a kind of electronic control multi-cylinder engine starting method and corresponding device.
Background technique
Electronic control multi-cylinder engine needs to utilize the information such as oil mass injection advance angle, cylinder number when starting.For obtaining these information, usually first go out the current residing phase place of motor by the signal of crankshaft sensor and the Signal analysis of camshaft-signal sensor.But, when camshaft-signal sensor break down or the phenomenon such as the dropout that obtains time, owing to being only left the signal that crankshaft sensor provides, the phase information of motor at 0 ° to 360 ° (or 360 ° to 720 °) only can be determined according to this signal, namely, when some cylinders of electronic control multi-cylinder engine are in top dead center, can not determine that this top dead center is compression top center or exhaust top dead center.
For the problems referred to above, prior art adopts usually " single cylinder acceleration threshold method " solves, after the method is in the cylinder of top dead center by the signal acquisition of crankshaft sensor, carry out fuel oil examination spray, then judge whether the initial tooth of a upper cylinder of this cylinder is greater than pre-set threshold value to the time and the initial tooth of this cylinder that terminate tooth to the time sum (these two times be called single cylinder acceleration) terminating tooth, if be greater than, then determine that the current residing phase place of motor is correct phase, otherwise, carry out phase reversal, adopt and determine correct phase in the same way.But this " single cylinder acceleration threshold values " method may cause erroneous judgement, the phase place namely occurring motor is but less than the phenomenon of pre-set threshold value for the value of correct phase and single cylinder acceleration, and especially in cold-start situations, this erroneous judgement odds will increase.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides the device of a kind of electric-control motor starting method and correspondence thereof, to determine the phase place residing for motor exactly.
The electronic control multi-cylinder engine starting method that the embodiment of the present application provides comprises:
When not obtaining the signal that camshaft-signal sensor provides, obtain the first phase residing for motor by crankshaft sensor;
Mate the second phase that described first phase and electronic control unit (ECU) store, if can mate, current phase place then residing for first phase or second phase determination motor, the second phase that described electronic control unit (ECU) stores is phase place when previous engine quits work residing for motor;
Current phase place ato unit residing for motor.
Preferably, after the current phase place residing for first phase or second phase determination motor, according to the current phase place oil spout determined, and single cylinder accekeration is calculated;
Judge whether the single cylinder accekeration calculated is greater than the first pre-set threshold value, if so, then performs the step of the current phase place ato unit residing for motor; If not, then current phase place of reversing, performs oil spout step according to the phase place after reversion.
Further preferably, described method also comprises: when judging that single cylinder accekeration is less than pre-set threshold value, record single cylinder accekeration is less than the number of times of the first pre-set threshold value, judge whether the number of times that described single cylinder accekeration is less than the first pre-set threshold value is less than the second pre-set threshold value, if, then perform the current phase place of reversion, according to the step of the phase place oil spout after reversion; If not, then the step according to the current phase place oil spout determined is performed.
Further preferably, described method also comprises: record oil spout number of times, judges whether described oil spout number of times is less than the 3rd pre-set threshold value, if so, then perform the step according to the current phase place oil spout determined.
The embodiment of the present application additionally provides a kind of electronic control multi-cylinder engine starting drive.This device comprises: phase place acquiring unit, phase matching components, phase de-termination unit and engine start unit, wherein:
Described phase place acquiring unit, for when not obtaining the signal that camshaft-signal sensor provides, obtains the first phase residing for motor by crankshaft sensor;
Described phase matching components, for mating the second phase that described first phase and electronic control unit (ECU) store, if can mate, then phase-triggered determining unit, the second phase that described electronic control unit (ECU) stores is phase place when previous engine quits work residing for motor;
Described phase de-termination unit, for the current phase place residing for first phase or second phase determination motor;
Described engine start unit, for the current phase place ato unit residing for motor.
Preferably, described device also comprises Injection Control unit, single cylinder acceleration calculation unit and the first judging unit, wherein:
Described Injection Control unit, for controlling fueling injection equipment according to the current phase place oil spout determined;
Described single cylinder acceleration calculation unit, for calculating single cylinder accekeration;
Described first judging unit, for judging whether the single cylinder accekeration calculated is greater than the first pre-set threshold value, if so, then triggers the current phase place ato unit of engine start unit residing for motor; If not, then Injection Control unit controls fueling injection equipment is triggered according to the phase place oil spout after the current phase place of reversion.
Preferably, described device also comprises the first recording unit and the second judging unit, wherein:
Described first recording unit, for when judging that single cylinder accekeration is less than pre-set threshold value, record single cylinder accekeration is less than the number of times of the first pre-set threshold value;
Described second judging unit, for judging whether the number of times that the described single cylinder accekeration of the first recording unit records is less than the first pre-set threshold value is less than the second pre-set threshold value, if so, then Injection Control unit controls fueling injection equipment is triggered according to the phase place oil spout after the current phase place of reversion; If not, then Injection Control unit controls fueling injection equipment is triggered according to the current phase place oil spout determined.
Further preferably, described device also comprises the second recording unit and the 3rd judging unit, wherein:
Described second recording unit, for recording oil spout number of times;
Described 3rd judging unit, for judging whether described oil spout number of times is less than the 3rd pre-set threshold value, if so, then triggers Injection Control unit controls fueling injection equipment according to the current phase place oil spout determined.
The embodiment of the present application, when not obtaining the signal that camshaft-signal sensor provides, determines the phase place residing for motor by the first phase residing for the motor that obtained by crankshaft sensor and the mode that the second phase that electronic control unit stores carries out mating.Which adopts " cylinder result is sentenced in parking " as the foundation determining phase place, decreases the possibility of phase place erroneous judgement.In addition, which can avoid the repeatedly oil spout of single cylinder acceleration threshold method, decreases the impact of oil spout on discharge.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the flow chart of the electronic control multi-cylinder engine starting method embodiment of the application;
Fig. 2 is the flow chart of another embodiment of electronic control multi-cylinder engine starting method of the application;
Fig. 3 is the flow chart of an example of the embodiment of the present application;
Fig. 4 is the composition frame chart of the electronic control multi-cylinder engine starting drive of the application.
Embodiment
Technological scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technological scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
See Fig. 1, the figure shows the flow process of the electronic control multi-cylinder engine starting method embodiment of the application.This embodiment (embodiment one) comprising:
Step S101: when not obtaining the signal that camshaft-signal sensor provides, obtains the first phase residing for motor by crankshaft sensor;
As previously mentioned, under normal circumstances, the signal that camshaft-signal sensor provides and the signal that crankshaft sensor provides are for determining that the current residing phase place of motor is necessary, but under the impact of some factor, the phenomenon that normally can not obtain cam sensor signal may be there is, these factors may be cannot collect signal because camshaft-signal sensor itself breaks down, also may be that the signal that camshaft-signal sensor collects is lost in transmitting procedure, may be also the signal that collects due to camshaft-signal sensor because transmission delay is failed at the moment reaching on the time determining the current phase place of motor, so that do not obtain camshaft-signal sensor signal.No matter which kind of reason, as long as the signal not obtaining that camshaft-signal sensor provides, can adopt the judgement of the current residing phase place of the method determination motor of the present embodiment, and then realize the startup of motor according to this phase place.The present embodiment learn do not obtain camshaft-signal sensor signal time, because crankshaft sensor is also in normal working, phase place residing for motor can be detected by crankshaft sensor, but, the Back ground Information obtaining this phase place does not have the signal of camshaft to support, this phase place is " detected phase ", is probably inaccurate, and needs to judge according to the mode of the embodiment of the present application.
Step S102: mate the second phase that described first phase and electronic control unit (ECU) store, if can mate, current phase place then residing for first phase or second phase determination motor, the second phase that described electronic control unit (ECU) stores is phase place when previous engine quits work residing for motor;
Electronic control unit (ElectronicControlUnit, ECU), be commonly called as " car running computer ", " vehicle-mounted computer ", be automobile specified computer controller, be usually made up of microprocessor (CPU), storage (ROM, RAM), input/output interface (I/O), analog-digital converter (A/D) and the large-scale integrated circuit (LSI) such as shaping, driving.The operations such as the information that electronic control unit takes into account the input of various sensor according to its internally stored program and data to air mass flow stores, computing, process, judgement, then output order, carries out relevant controlling to driving conditions.The electronic control unit of the present embodiment passes through the phase place in the signal acquisition engine operation of crankshaft sensor when previous engine works, this phase place constantly changes in engine working process, when vehicle stop, engine stop work time, phase information when electronic control unit (ECU) stores engine stop.After detecting the current residing first phase of the motor obtained by abovementioned steps, the second phase stored in itself and electronic control unit (ECU) is carried out matching ratio comparatively, if both are identical, then illustrate that first phase or second phase are current phase place residing for motor, if both are not identical, illustrate that the first phase obtained by crankshaft sensor is not correct phase place, need to take measures further to be determined.
Step S103: current phase place ato unit residing for motor; After determining the correct phase residing for motor, operated fuel injection ato unit can be carried out according to this phase place.
The present embodiment, when not obtaining the signal that camshaft-signal sensor provides, carries out the correct phase residing for mode determination motor mated by the first phase residing for the motor that obtained by crankshaft sensor and the second phase that electronic control unit stores.Which adopts " cylinder result is sentenced in parking " as the foundation determining phase place, decreases the possibility of phase place erroneous judgement.In addition, which can avoid the repeatedly oil spout of single cylinder acceleration threshold method, thus decreases the impact of oil spout on discharge.
It should be noted that: the phase place in above-described embodiment can embody in a different manner, mark as by cylinder embodies, when motor is under certain phase condition, namely the position of certain cylinder is determined, therefore, by cylinder mark, above-mentioned phase matching process is described: obtain the identification number (the first cylinder mark) being in certain cylinder of top dead center corresponding to first phase residing for motor by crankshaft sensor, then mate the second cylinder being in compression top center that described first cylinder identifies and electronic control unit (ECU) stores to identify, if both couplings, illustrate that the phase place of the first cylinder mark correspondence obtained by crankshaft sensor is correct phase place, otherwise, need to take other measures to judge further.Here the first cylinder mark, the difference cylinder of the second cylinder mark for distinguishing electronic control multi-cylinder engine, can be presented as cylinder cylinder number.Similarly, above-mentioned first phase, second phase are also mainly used in distinguishing different phase places, do not illustrate to there is dividing of " successively " order between phase place.
Above-described embodiment has described the method that phase place residing for motor is determined in utilization " cylinder result is sentenced in parking " in detail, although the method more adequately can determine phase place, reduce phase place erroneous judgement, but in actual application, engine phase position information is also relevant to factors such as engine speed, in-cylinder pressure temperature, these factors all may cause the phase place determined in the manner described above may not be very correct, especially in cold start-up situation, because rotating speed during cold start-up is on the low side and fluctuation is comparatively large, the phase place determined more may be caused to occur deviation.In order to improve the accuracy determining phase place further, the application also considers the method for above-described embodiment to combine with " single cylinder acceleration threshold method ", like this, relative to only adopting for " single cylinder acceleration threshold method ", can more adequately determine present engine phase place before carrying out fuel oil examination spray, can further improve the successful probability of examination spray.Engine starting process after this improvement see Fig. 2, can the figure shows another embodiment (embodiment two) of the electronic control multi-cylinder engine starting method that the application provides.This embodiment comprises:
Step S201: when not obtaining the signal that camshaft-signal sensor provides, obtains the first phase residing for motor by crankshaft sensor;
Step S202: mate second phase when previous engine that described first phase and electronic control unit (ECU) store quits work, if can mate, then perform step S203;
Step S203: according to the current phase place residing for first phase or second phase determination motor;
Although current phase place residing for the motor determined by abovementioned steps is comparatively accurate, in order to improve accuracy further, following " single cylinder acceleration threshold method " can be adopted to correct " the current phase place " that this step is determined.
Step S204: according to the current phase place oil spout determined, and calculate single cylinder accekeration;
Step S205: judge whether the single cylinder accekeration calculated is greater than the first pre-set threshold value, if so, then performs step S206; If not, then step S205 (a) is performed: current phase place of reversing, enters step S204;
Here the first pre-set threshold value can set according to actual conditions, and common mode first carries out test of many times to obtain a provisional value, then finely tune on the basis of this provisional value, to obtain as far as possible reasonably threshold values.The initial tooth recording a cylinder before and after oil spout during test to terminating the initial tooth of the time of between cog with the previous cylinder of this cylinder and the time sum of end between cog, according to this time and change determine this threshold values.Through single cylinder accekeration and pre-set threshold value are compared judgement, if the single cylinder accekeration calculated is greater than the first pre-set threshold value, illustrate that the phase place determined according to " cylinder result is sentenced in parking " is consistent with the phase place that " single cylinder accekeration threshold method " is determined, " current phase place " that abovementioned steps is determined is correct phase, and subsequent step can carry out the start-up operation of motor according to this phase place; If the single cylinder acceleration figure calculated is less than the first pre-set threshold value, illustrates that the result that two kinds of modes draw is inconsistent, other measures should be taked further to judge.Current phase place is reversed by the present embodiment, carries out fuel oil examination spray, repeat above-mentioned judgement operation, until the result of two kinds of modes is consistent after reversion according to the phase place after reversion.Here " inverted phase " carries out 360 ° of reversions to crankshaft angles, for the motor of 6 cylinders, setting ignition (startup) order is 1-5-3-6-2-4 (this numeric representation cylinder cylinder number), if current phase place is 1 cylinder compression top center, be 1 cylinder exhaust top dead center after phase reversal.
Step S206: the current phase place ato unit residing for motor.
The present embodiment will carry out phase determination method according to " cylinder result is sentenced in parking " and combine with " single cylinder accekeration threshold method ", for the former, because " single cylinder accekeration threshold method " can determine correct phase place by the reversion of repeatedly phase place, can improve relative to the simple mode sentencing cylinder result phase bit really according to stopping the accuracy that phase place determines further; For the latter, present engine phase place can be determined more exactly owing to sentencing cylinder result according to parking, the successful probability of first time examination spray can be improved compared to simple " single cylinder accekeration threshold method ", shorten starting time, thus realize the quick startup of motor under without camshaft-signal sensor RST.
In above-mentioned second embodiment, when judging that single cylinder accekeration is less than the first pre-set threshold value, carry out phase reversal immediately, and perform operated fuel injection according to the phase place after reversion.But in some cases, single cylinder accekeration is less than pre-set threshold value must not represent that the phase place of current oil spout is incorrect, and this may be caused by other reasons, such as, the fault, single cylinder acceleration acquisition mistake etc. of fueling injection equipment itself.If do not consider these special circumstances, and directly carry out phase reversal simply, may cause needing repeatedly phase reversal just can get back to correct phase place, to the engine start time, start success rate generation considerable influence.For this reason, the application is preferably when occurring that single cylinder accekeration is less than the first pre-set threshold value, record this number of times, only just carry out the step of phase reversal when this number of times is greater than the second pre-set threshold value, and before number of times is less than the second pre-set threshold value, repeats the operated fuel injection carried out according to the phase place of not reversing.Here the second pre-set threshold value is equivalent to one " frequency of failure tolerance value ", namely time under this tolerance value, think that the situation that single cylinder accekeration is less than the first pre-set threshold value is acceptable, the factor causing single cylinder acceleration figure to be less than the first pre-set threshold value is that the possibility of other improper factors is larger; When exceeding on this tolerance value, think that the situation that single cylinder accekeration is less than the first pre-set threshold value is no longer accepted, the phase place of at this moment current oil spout is that the possibility of incorrect phase place is larger.In addition, the application can also set the 3rd pre-set threshold value, this pre-set threshold value is for judging the fuel oil examination spray total degree carried out altogether before and after reversion, time under the threshold values that this is preset, can accept to determine correct phase place by repeatedly trying to spray, if after examination spray number of times exceedes pre-set threshold value, still can not determine correct phase place, then may there is otherwise problem in this motor, continue repetition " single cylinder acceleration threshold method " more without much meanings, at this moment can think that examination is sprayed unsuccessfully, should consider to take other measures to realize the startup of motor.
In order to further illustrate the technological scheme of the embodiment of the present application, explain with an example specifically below.See Fig. 3, the figure shows the flow process of this example.This example comprises the steps:
Step S301: power-up initializing;
Step S302: bent axle automatic synchronization;
Step S303: enter without camshaft signal start-up mode when camshaft-signal sensor Signal Fail being detected, and the cylinder No. the first being in top dead center is obtained by crankshaft sensor;
Step S304: read the cylinder No. the second being in compression top center when stopping last time from ECU;
Step S305: judge whether the first cylinder number mates with the second cylinder number, if coupling, performs step S307; If do not mated, perform step S306;
Step S306: inverted phase;
Step S307: judge whether to reach maximum examination spray number of times (the 3rd pre-set threshold value), if reached, then performs step S311; If do not reached, then perform step S308.
Step S308: by current phase place oil spout; Here current phase place can be the phase place by determining after step S305 coupling, also can be through the phase place after phase reversal;
Step S309: calculate single cylinder acceleration;
Step S310: the single cylinder accekeration of calculating and the first predetermined threshold value are compared, if be greater than the first predetermined threshold value, then performs step S313; If be less than the first pre-set threshold value, then perform step S311;
Step S311: judge whether the number of times that single cylinder accekeration is less than the first pre-set threshold value reaches default tolerance value (the second pre-set threshold value), if reached, then returns and performs step S306; If do not reached, then return and perform step S308;
Step S312: examination is sprayed unsuccessfully, fails to determine correct phase, process ends.
Step S313: examination is sprayed into merit, realizes engine start according to current phase place oil spout.
It should be noted that: in above-mentioned steps S305, if when overmatching finds that the first cylinder number and the second cylinder are number inconsistent, can negate directly the result of " cylinder is sentenced in parking ", enter phase reversal step, and then adopt " single cylinder acceleration threshold method " to carry out the determination of phase place.Here directly entering phase reversal operation is " phase reversal " first, if parking result can determine that the phase place of certain several cylinder is necessarily in certain phase range (such as 360 ° to 720 °), and this phase range can not comprise correct phase place, then directly carry out phase reversal, the chance of success of an oil spout can be increased like this, thus be conducive to shortening the time successfully started.
Whether single cylinder accekeration is greater than the condition of number of times as inverted phase that the first pre-set threshold value and single cylinder acceleration are less than the first pre-set threshold value by above-mentioned example, in actual application, except this determine whether to need the mode of inverted phase except, also there is some in rule of engine model association in the determination of inverted phase, whether inverted phase can be determined according to this rule after looking for out this rule, thus simplify above-mentioned matching process.Such as, for 6 Cylinder engines, predetermined firing order is 1-5-3-6-2-4.See table 1, the data that the 20 groups of start and stop experiment that this table shows 6 cylinder machines gathers, these data can reflect the impact of shutoff cylinder number on phase reversal when starting without camshaft signal.Can find that from these data the rule of phase reversal is: when last time, shutoff cylinder number was 4 cylinders, 1 cylinder, 5 cylinder, last time, shutoff cylinder number was always mated with the cylinder being in top dead center number obtained by crankshaft sensor, then next time starts under without camshaft signal condition does not need phase reversal, directly carries out the process of " single cylinder acceleration threshold method "; When last time, shutoff cylinder number was 3 cylinders, 6 cylinders, 2 cylinder, last time, shutoff cylinder number was number always unmatched with the cylinder being in top dead center that obtained by crankshaft sensor, first carry out inverted phase when then next time starts under without camshaft signal condition, then carry out the process of " single cylinder acceleration threshold method ".
| Sequence number | Last time shutoff cylinder number | Whether reverse |
| 1 | 4 | No |
| 2 | 1 | No |
| 3 | 5 | No |
| 4 | 6 | Be |
| 5 | 4 | No |
| 6 | 6 | Be |
| 7 | 3 | Be |
| 8 | 1 | No |
| 9 | 2 | Be |
| 10 | 4 | No |
| 11 | 1 | No |
| 12 | 5 | No |
| 13 | 3 | Be |
| 14 | 3 | Be |
| 15 | 1 | No |
| 16 | 6 | Be |
| 17 | 5 | No |
| 18 | 1 | No |
| 19 | 4 | No |
| 20 | 5 | No |
Previous embodiment has described the embodiment of the electronic control multi-cylinder engine starting method of the application in detail, correspondingly, present invention also provides the embodiment of electronic control multi-cylinder engine starting drive.See Fig. 4, the figure shows the composition frame chart of this embodiment.This device is embodiment comprise: phase place acquiring unit 401, phase matching components 402, phase de-termination unit 403 and engine start unit 404, wherein:
Phase place acquiring unit 401, for when not obtaining the signal that camshaft-signal sensor provides, obtains the first phase residing for motor by crankshaft sensor;
Phase matching components 402, for mating the second phase that described first phase and electronic control unit (ECU) store, if can mate, then phase-triggered determining unit, the second phase that described electronic control unit (ECU) stores is phase place when previous engine quits work residing for motor;
Phase de-termination unit 403, for the current phase place residing for first phase or second phase determination motor;
Engine start unit 404, for the current phase place ato unit residing for motor.
The working procedure of this device embodiment is: phase place acquiring unit 401 is not when obtaining the signal that camshaft-signal sensor provides, the first phase inspired residing for motivation is obtained by crankshaft sensor, then mate by phase matching components 402 second phase that described first phase and electronic control unit (ECU) store, if can mate, then phase-triggered determining unit 403, by the current phase place of this unit residing for first phase or second phase determination motor, and then the current phase place ato unit of engine start unit 404 residing for motor.
This device embodiment is not when obtaining the signal that camshaft-signal sensor provides, last time first phase residing for the motor obtained by crankshaft sensor and electronic control unit stored, second phase residing when engine stop works was mated, and determined the current correct phase residing for motor with this.Which adopts " cylinder result is sentenced in parking " as the foundation determining phase place, decreases the possibility of phase place erroneous judgement.In addition, which can avoid the repeatedly oil spout of single cylinder acceleration threshold method, decreases the impact of oil spout on discharge.
Said apparatus embodiment utilizes to stop and sentences cylinder result and more adequately determine current phase place residing for motor, and then according to this phase place ato unit, can achieve the goal of the invention of the application.But, in some cases, based on special needs, Improvement and perfection can also be carried out to said apparatus embodiment.Such as, a kind of mode is combined with said method " single cylinder acceleration threshold method ", to make full use of two kinds of modes advantage separately, realizes the quick startup of motor.Under this situation, said apparatus embodiment may further include Injection Control unit 405, single cylinder acceleration calculation unit 406 and the first judging unit 407, wherein: Injection Control unit 405, for controlling fueling injection equipment according to the current phase place oil spout determined; Single cylinder acceleration calculation unit 406, for calculating single cylinder accekeration; First judging unit 407, for judging whether the single cylinder accekeration calculated is greater than the first pre-set threshold value, if so, then triggers engine start unit 404 current phase place ato unit residing for motor; If not, then trigger Injection Control unit 405 and control fueling injection equipment according to the phase place oil spout after the current phase place of reversion.This single cylinder acceleration threshold method is sentenced with according to stopping the method that cylinder result merges, be conducive on the one hand overcoming some erroneous judgement in particular cases of stopping and sentencing that cylinder mode may bring, can revise by single cylinder acceleration threshold method or avoid stopping and sentence the result of cylinder; Can determine phase place more exactly owing to using parking to sentence cylinder result before single cylinder acceleration threshold method on the other hand, thus the successful probability of first time examination spray can be improved, be conducive to shortening engine start efficiency.
On aforementioned improved basis, in conjunction with actual demand, aforementioned means embodiment can also be optimized in the two directions.As long as one is that the single cylinder acceleration calculated in aforementioned means embodiment is less than default threshold values and namely carries out phase reversal, but in real process, current phase place may be there is correct but cause single cylinder acceleration to be less than the phenomenon of pre-set threshold value because of other reasons, if at this moment directly carry out phase reversal, reverse causing again and just can get back in correct phase place through the phase place of at least twice again, for this reason, the preferred said apparatus embodiment of the application also comprises the first recording unit 408 and the second judging unit 409, wherein: the first recording unit 408, for when judging that single cylinder accekeration is less than pre-set threshold value, record single cylinder accekeration is less than the number of times of the first pre-set threshold value, second judging unit 409, for judging whether the number of times that the described single cylinder accekeration of the first recording unit records is less than the first pre-set threshold value is less than the second pre-set threshold value, if so, then trigger Injection Control unit 405 and control fueling injection equipment according to the phase place oil spout after the current phase place of reversion, if not, then trigger Injection Control unit 405 and control fueling injection equipment according to the current phase place oil spout determined.As long as two is that aforementioned means embodiment phase place is not correctly determined, to circulate always carry out single cylinder acceleration threshold method or inverted phase Posterior circle carries out single cylinder acceleration threshold method, to cause the improper prolongation of engine start time like this, occur for avoiding this situation, the preferred said apparatus embodiment of the application also comprises the second recording unit 410 and the 3rd judging unit 411, wherein: the second recording unit 410, for recording oil spout number of times; 3rd judging unit 411, for judging whether described oil spout number of times is less than the 3rd pre-set threshold value, if so, then triggers Injection Control unit 405 and controls fueling injection equipment according to the phase place oil spout after the current phase place of reversion.Current meaningless circulation can be terminated in time like this, and then can consider to take other measure ato units.
It should be noted that: easy in order to what describe, what each embodiment of this specification stressed is the difference with other embodiments, between each embodiment identical similar part mutually see.Especially, for device embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Each unit of device embodiment described above or can may not be and physically separates, and both can be positioned at a place, or under also can being distributed to multiple network environment.In actual application, some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme, and those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above is only the embodiment of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection domain of the application.
Claims (6)
1. an electronic control multi-cylinder engine starting method, is characterized in that, described method comprises:
When not obtaining the signal that camshaft-signal sensor provides, obtain the first phase residing for motor by crankshaft sensor;
Mate the second phase that described first phase and electronic control unit (ECU) store, if can mate, current phase place then residing for first phase or second phase determination motor, the second phase that described electronic control unit (ECU) stores is phase place when previous engine quits work residing for motor;
Current phase place ato unit residing for motor;
After the current phase place residing for first phase or second phase determination motor, according to the current phase place oil spout determined, and calculate single cylinder accekeration;
Judge whether the single cylinder accekeration calculated is greater than the first pre-set threshold value, if so, then performs the step of the current phase place ato unit residing for motor; If not, then current phase place of reversing, performs oil spout step according to the phase place after reversion.
2. method according to claim 1, is characterized in that, described method also comprises:
When judging that single cylinder accekeration is less than pre-set threshold value, record single cylinder accekeration is less than the number of times of the first pre-set threshold value, judge whether the number of times that described single cylinder accekeration is less than the first pre-set threshold value is less than the second pre-set threshold value, if, then perform the current phase place of reversion, according to the step of the phase place oil spout after reversion; If not, then the step according to the current phase place oil spout determined is performed.
3. method according to claim 2, is characterized in that, described method also comprises:
Record oil spout number of times, judges whether described oil spout number of times is less than the 3rd pre-set threshold value, if so, then performs the step according to the current phase place oil spout determined.
4. an electronic control multi-cylinder engine starting drive, it is characterized in that, this device comprises: phase place acquiring unit, phase matching components, phase de-termination unit and engine start unit, Injection Control unit, single cylinder acceleration calculation unit and the first judging unit, wherein:
Described phase place acquiring unit, for when not obtaining the signal that camshaft-signal sensor provides, obtains the first phase residing for motor by crankshaft sensor;
Described phase matching components, for mating the second phase that described first phase and electronic control unit (ECU) store, if can mate, then phase-triggered determining unit, the second phase that described electronic control unit (ECU) stores is phase place when previous engine quits work residing for motor;
Described phase de-termination unit, for the current phase place residing for first phase or second phase determination motor;
Described engine start unit, for the current phase place ato unit residing for motor;
Described Injection Control unit, for controlling fueling injection equipment according to the current phase place oil spout determined;
Described single cylinder acceleration calculation unit, for calculating single cylinder accekeration;
Described first judging unit, for judging whether the single cylinder accekeration calculated is greater than the first pre-set threshold value, if so, then triggers the current phase place ato unit of engine start unit residing for motor; If not, then Injection Control unit controls fueling injection equipment is triggered according to the phase place oil spout after the current phase place of reversion.
5. device according to claim 4, is characterized in that, described device also comprises the first recording unit and the second judging unit, wherein:
Described first recording unit, for when judging that single cylinder accekeration is less than pre-set threshold value, record single cylinder accekeration is less than the number of times of the first pre-set threshold value;
Described second judging unit, for judging whether the number of times that the described single cylinder accekeration of the first recording unit records is less than the first pre-set threshold value is less than the second pre-set threshold value, if so, then Injection Control unit controls fueling injection equipment is triggered according to the phase place oil spout after the current phase place of reversion; If not, then Injection Control unit controls fueling injection equipment is triggered according to the current phase place oil spout determined.
6. device according to claim 5, is characterized in that, described device also comprises the second recording unit and the 3rd judging unit, wherein:
Described second recording unit, for recording oil spout number of times;
Described 3rd judging unit, for judging whether described oil spout number of times is less than the 3rd pre-set threshold value, if so, then triggers Injection Control unit controls fueling injection equipment according to the current phase place oil spout determined.
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| CN103047022B (en) * | 2012-12-30 | 2015-10-07 | 潍柴动力股份有限公司 | A kind of electronic controlled diesel is without the starting method of camshaft signal and device |
| CN103953451B (en) * | 2013-05-24 | 2016-07-13 | 潍柴动力股份有限公司 | Obtain the method for engine cut-off cylinder number, device and electromotor |
| CN104806368B (en) * | 2015-04-09 | 2017-06-06 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Suitable for the engine quick start method of any installation phase |
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| CN101586503A (en) * | 2008-05-19 | 2009-11-25 | 福特环球技术公司 | Approach for engine start synchronization |
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