CN100520029C - Method for non-phase sensor recognizing one cylinder compression top center - Google Patents
Method for non-phase sensor recognizing one cylinder compression top center Download PDFInfo
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- CN100520029C CN100520029C CNB2007100940271A CN200710094027A CN100520029C CN 100520029 C CN100520029 C CN 100520029C CN B2007100940271 A CNB2007100940271 A CN B2007100940271A CN 200710094027 A CN200710094027 A CN 200710094027A CN 100520029 C CN100520029 C CN 100520029C
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method for identifying the upper stop for compression of no.1 cylinder without any phase sensor. Wherein, first of all an engine is started by grouped injection or sequence injection without any phase sensor; while the engine is successfully started and the speed increases and then decreases to idling speed, the fuel injection of no.1 cylinder is cut off in an active way, and the upper stop for compression for no.1 cylinder is identified based on the fluctuation rule of the engine speed. The fluctuation rule of the engine speed is: after cutting off the oil injection of no.1 cylinder in an active way, if ECU detects continuous fire-out of no.1 cylinder, then the original synchronous state between the ECU and the engine is right; if ECU detects continuous fire-out of no.4 cylinder, then the original synchronous state between the ECU and the engine is wrong. The invention can save cost for the system, simplify engine design, and obtain efficiency both in respect to economy and technology.
Description
Technical field
The present invention relates to a kind of implementation method of electric control fuel oil jet system.
Background technique
The petrol engine electric control fuel oil jet system is meticulous with its control, and response can realize advantages such as closed loop control rapidly, has occupied the petrol engine market of the modern overwhelming majority.The electric control fuel oil jet system of modern four stroke engine comprises ECU (electronic control unit), sensor and final controlling element three parts, wherein generally adopts the pulse disc inductive sensor to measure rotary speed information and crank position information.
Pulse disc is a fluted disc, and the position of 60 gear teeth is arranged, but 2 gear teeth vacancies are arranged.Pulse disc is contained on the bent axle, with crankshaft rotating.During engine running, the gear teeth on the pulse disc whenever by electromagnetic induction sensor once, just induce an alternating voltage signal in the inductor coil in sensor, and produce the alternating voltage signal of a distortion at the hypodontia place, ECU just can calculate the rotating speed of crank position and motor in view of the above.In once complete four-stroke, crankshaft rotating 2 circle though the pulse disc inductive sensor can make ECU discern the top dead center of 1 cylinder, but can't be distinguished the compression top center or the exhaust top dead center of 1 cylinder.
Phase detector matches with the pulse disc inductive sensor, for ECU provides crank phase information, then can distinguish the compression top center and the exhaust top dead center of 1 cylinder.Common phase detector is made up of a Hall transducer and a signal wheel (semicircular ferromagnet), and the signal wheel is installed on the camshaft and with camshaft and rotates.Since corresponding crankshaft rotating 2 circles of camshaft rotation 1 circle, and semicircular signal wheel enters into the induction range of Hall transducer in the half-turn of camshaft rotation, leave the induction range of Hall transducer in addition in the half-turn; Correspondingly phase detector has signal at 1 circle of crankshaft rotating, and 1 circle does not have signal in addition.Phase detector combined with the pulse disc inductive sensor just distinguished the compression top center and the exhaust top dead center of 1 cylinder, make ECU and motor accurate synchronization, thereby realize the correct sequence-injection of fuel oil.
Phase detector is indispensable for the fuel oil sequence-injection in the prior art, research and development technology and experience that this case inventor was accumulated in related domain based on the past, from saving system cost, simplifying the angle of engine design sets out, finally develop a kind of brand-new method that need not phase sensor recognizing one cylinder compression top center, thereby can realize the sequence-injection that fuel oil is correct.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method of compression top center of identification 1 cylinder, this method need not phase detector, but equally can discern in the compression of 1 cylinder to point, thereby finish the accurate synchronization of motor and ECU, realize the correct sequence-injection of fuel oil.
For solving the problems of the technologies described above, the method of non-phase sensor recognizing one cylinder compression top center of the present invention is: at first adopt injection in groups or sequence-injection to pilot engine under the situation of non-phase sensor, in the starting process of motor, ECU or synchronous with the compression top center of 1 cylinder, perhaps synchronous with the exhaust top dead center of 1 cylinder; In motor success starting speed was leapt high and then fallen down the process of idling, ECU initiatively cut off the oil spout of 1 cylinder, discerns 1 cylinder compression top center according to the fluctuation pattern of engine speed;
The fluctuation pattern of described engine speed is: initiatively cut off the oil spout of 1 cylinder at ECU after, occur continuously catching fire if ECU detects former 1 synchronous cylinder compression top center place, can judge that then the former sync state between ECU and the motor is correct; Occur continuously catching fire if ECU detects former 1 synchronous cylinder exhaust top dead center place, then can judge the former sync state mistake between ECU and the motor.
The method of described non-phase sensor recognizing one cylinder compression top center in the process of initiatively cutting off 1 cylinder oil spout, if fuel oil is jet mode in groups during engine start before, then switches to the sequence-injection pattern.
If the former sync state between described method ECU and the motor is correct, then keep this correct sync state; If the former sync state mistake between ECU and the motor is then adjusted to correct sync state according to the compression top center of 1 cylinder.
The present invention can save system cost, simplifies engine design, obtains the double benefit of economy and technology.
Description of drawings
The present invention is further detailed explanation below in conjunction with drawings and Examples:
Fig. 1 adopts the schematic representation of the process medium speed of method of the present invention for motor;
Fig. 2 is the schematic representation of motor and 1 cylinder compression top center synchronous initiation;
Fig. 3 is the schematic representation of motor and 1 cylinder exhaust top dead center synchronous initiation.
Embodiment
See also Fig. 1, the present invention is lacking under the situation of phase detector, engine temperature during according to starting can adopt the pattern starting of injection in groups or sequence-injection (may be wrong sequence-injection), and engine speed is shown in the I zone among Fig. 1 in the starting process.
After motor success starting speed surpasses the target idling, get back in the process of idling, 1 cylinder is initiatively implemented oil-break.Oil-break must make that engine speed fluctuates, and according to the engine speed crank position rule that occurs of smoothness not, whether the sync state that can differentiate ECU when piloting engine and motor is correct.Whether correct in sync state when cutting off 1 cylinder oil spout and judging engine start the process engine speed is shown in the II zone among Fig. 1.
No matter motor is that fuel injection mode all can at first switch to the sequence-injection pattern in the process of initiatively implementing oil-break, cuts off 1 cylinder oil spout then with start-of-injection in groups or with the sequence-injection starting.If correct, then keep this correct sync state and fuel injection order by the sync state of judging ECU and motor.If find that the sync state of ECU and motor is incorrect, then switch to correct sync state and fuel injection order.Engine speed is shown in the III zone among Fig. 1 after adjusting to correct sync state and fuel injection order.
Because lack phase detector, can't distinguish when starting is synchronous for four stroke engine ECU is the compression top center and the exhaust top dead center of 1 cylinder, so can only guess wherein a kind of during engine start, just have two kinds of possible sync states when starting like this: sync state is correct or opposite with correct status.
What Fig. 2 represented is the correct situation of sync state that motor is guessed when non-phase sensor starts.Wherein, four of each cylinder strokes (aspirating stroke, compression stroke, expansion stroke, exhaust stroke) move in circles.The cylinder counter is that ECU calculates the pairing number of cylinders of current compression stroke, the compression top center of 1 cylinder that 0 expression ECU of cylinder counter thinks, the compression top center of 3 cylinders that 1 expression ECU thinks, the compression top center of 4 cylinders that 2 expression ECU think, the compression top center of 2 cylinders that 3 expression ECU think.
At first, ECU adopts in groups jet mode to pilot engine, this process shown in the I zone among Fig. 2,1 cylinder and the oil spout together of 4 cylinders, 2 cylinders and the oil spout together of 3 cylinders.
In engine start success, rotating speed is leapt high and then fallen down in the process of idling, and fuel injection mode is switched to the sequence-injection pattern.Then, the oil-break that ECU initiatively implements 1 cylinder, because the engine speed of catching fire will fluctuate, the while motor can be according to the fluctuation of speed detection of catching fire, this process is shown in the II zone among Fig. 2.
In the present embodiment, the former sync state between ECU and the motor is correct, and the oil spout of 1 cylinder occurs in the exhaust stroke of 1 cylinder.Therefore, after ECU initiatively implemented oil-break to 1 cylinder, catching fire appearred in 1 cylinder compression top center place that ECU can detect former conjecture continuously, then can judge that the sync state of ECU conjecture when starting is correct this moment, do not need sync state is made amendment, this process is shown in the III zone among Fig. 2.
Fig. 3 has then represented another situation: the sync state of guessing during starting is with correct opposite, and the oil spout of 1 cylinder occurs in the exhaust stroke of 4 cylinders.Therefore, after ECU initiatively implements oil-break to 1 cylinder, ECU can detect 4 cylinder compression top centers (i.e. 1 cylinder exhaust top dead center) of former conjecture and locate to occur continuously catching fire, can judge then ECU guesses to be the compression top center of 1 cylinder mistakenly to the exhaust top dead center of 1 cylinder this moment, and therefore the sync state of conjecture is opposite with correct status when starting.ECU can discern the compression top center of 1 correct cylinder according to situation about detecting, thereby upgrades sync state, and this process is shown in the III zone among Fig. 3.
It is simple that the method for identification 1 cylinder compression top center that the present invention adopts has coupling, need not change by hardware Moving, little to existing software platform change, discharging is affected the advantages such as littler, have very high feasibility And practical value.
Claims (3)
1. the method for a non-phase sensor recognizing one cylinder compression top center, it is characterized in that: at first under the situation of non-phase sensor, adopt injection in groups or sequence-injection to pilot engine, in the starting process of motor, ECU or synchronous with the compression top center of 1 cylinder, perhaps synchronous with the exhaust top dead center of 1 cylinder; In motor success starting speed was leapt high and then fallen down the process of idling, ECU initiatively cut off the oil spout of 1 cylinder, discerns 1 cylinder compression top center according to the fluctuation pattern of engine speed;
The fluctuation pattern of described engine speed is: initiatively cut off the oil spout of 1 cylinder at ECU after, occur continuously catching fire if ECU detects former 1 synchronous cylinder compression top center place, can judge that then the former sync state between ECU and the motor is correct; Occur continuously catching fire if ECU detects former 1 synchronous cylinder exhaust top dead center place, then can judge the former sync state mistake between ECU and the motor.
2. the method for non-phase sensor recognizing one cylinder compression top center according to claim 1, it is characterized in that: described method is in the process of initiatively cutting off 1 cylinder oil spout, if fuel oil is jet mode in groups during engine start before, then switch to the sequence-injection pattern.
3. the method for non-phase sensor recognizing one cylinder compression top center according to claim 1 is characterized in that: if the former sync state between described method ECU and the motor is correct, then keep this correct sync state; If the former sync state mistake between ECU and the motor is then adjusted to correct sync state according to the compression top center of 1 cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100940271A CN100520029C (en) | 2007-08-21 | 2007-08-21 | Method for non-phase sensor recognizing one cylinder compression top center |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100940271A CN100520029C (en) | 2007-08-21 | 2007-08-21 | Method for non-phase sensor recognizing one cylinder compression top center |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101109333A CN101109333A (en) | 2008-01-23 |
| CN100520029C true CN100520029C (en) | 2009-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100940271A Expired - Fee Related CN100520029C (en) | 2007-08-21 | 2007-08-21 | Method for non-phase sensor recognizing one cylinder compression top center |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013203400B3 (en) * | 2013-02-28 | 2014-04-30 | Robert Bosch Gmbh | Method for synchronizing internal combustion engine, involves defining sequence of application of different synchronization processes based on operation characteristics of internal combustion engine by control unit |
| JP6484306B2 (en) * | 2017-08-29 | 2019-03-13 | 株式会社ケーヒン | Internal combustion engine misfire detection device |
| CN107388923A (en) * | 2017-09-06 | 2017-11-24 | 广西玉柴机器股份有限公司 | The device of the first cylinder top dead centre is found under engine body inversion state |
| CN113294255A (en) * | 2021-05-19 | 2021-08-24 | 奇瑞汽车股份有限公司 | Cylinder judging method of phase-free sensor |
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| CN101109333A (en) | 2008-01-23 |
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