CN102562338B - Timing judgment method for engine - Google Patents
Timing judgment method for engine Download PDFInfo
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- CN102562338B CN102562338B CN201010620370.7A CN201010620370A CN102562338B CN 102562338 B CN102562338 B CN 102562338B CN 201010620370 A CN201010620370 A CN 201010620370A CN 102562338 B CN102562338 B CN 102562338B
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- dead center
- top dead
- cylinder pressure
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- judge
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Abstract
The invention relates to a timing judgment method for an engine. The method comprises a step of detecting whether the position of a piston of the engine is the top dead center or not and a step of judging that the top dead center is the top dead center of a compression stroke or the top dead center of an exhaust stroke, wherein judgment in the latter step can be carried out by a cylinder pressure sensor. According to the timing judgment method provided by the invention, the mounting of a camshaft sensor can be cancelled so as to lower the cost for a system; and on the other hand, the reliability of the system can be improved if the camshaft sensor is not cancelled.
Description
[technical field]
The present invention relates to the electronic control system strategy of motor, belong to field of engine control; Specifically, the present invention relates to a kind of timing judgment method for engine carried out based on cylinder pressure sensor.
[background technique]
Determining igniting, the timing of injection and the needs of pulsewidth to meet electronic engine management system, in traditional engine management system, usually adopting crankshaft sensor and camshaft-signal sensor to coordinate the transient position realizing judging bent axle and camshaft.
Convex axle sensor is one of topmost sensor in electronic engine management system.Convex axle sensor, except reacting the transient speed of motor, also must complete and judge timing arbitration functions.In order to characterize the special position of a certain specific cylinder, generally specially machining feature tooth on trigger signal dish, as processed multiple tooth or few tooth.Because a working procedure of bent axle rotates two weeks, it is compression top center or burning top dead center that feature tooth can not be reflected to the end, can not complete timing arbitration functions.
In addition, camshaft-signal sensor can reflect different level signals in feature tooth position for compression top center and burning top dead center respectively, therefore camshaft-signal sensor and crankshaft sensor use the function that can complete timing and judge jointly, and both form the underlying basis that engine ignition sprays jointly.
In novel motor, because needs control more accurately to in-cylinder combustion process, need to increase cylinder pressure sensor to realize, to the accurate measurement of in-cylinder combustion process and control, the performance of motor can being increased substantially.But, if also adopt crankshaft sensor and camshaft-signal sensor to carry out engine timing judgement in such engines as common motor, then make the increase of engine management system cost owing to increasing cylinder pressure sensor; In addition, only judged the particular location of top dead center by a kind of sensor, be not easy to remedy after inefficacy.
Therefore, need badly and a kind of method reducing this new work engine system cost is provided, and also expect that providing a kind of increases the method judging validity.
[summary of the invention]
The object of this invention is to provide a kind of timing judgment method for engine, it can overcome motor in prior art and have the motor of cylinder pressure sensor and camshaft-signal sensor so the problem of cost simultaneously.
In addition, further aim of the present invention is also to overcome the problem that the timing not only having cylinder pressure sensor but also have a camshaft-signal sensor judges to lose efficacy.
The usual following technological scheme of object of the present invention realizes:
According to the invention provides a kind of timing judgment method for engine, described method comprises the steps:
Steps A: the position detecting engine piston, if described position is top dead center, advances to step B, otherwise again detect;
Step B: judge that described top dead center is compression stroke top dead center or exhaust stroke top dead center,
Wherein, the judgement in described step B can be undertaken by cylinder pressure sensor, and
When the cylinder pressure that described cylinder pressure sensor detects is greater than predefined cylinder pressure value, judge that described top dead center is compression stroke top dead center; And
When the cylinder pressure that described cylinder pressure sensor detects is less than predefined cylinder pressure value, judge that described top dead center is exhaust stroke top dead center.
Alternatively, in foregoing method, described predefined cylinder pressure value is directly proportional to the throttle opening of motor.That is, throttle opening is larger, and predefined cylinder pressure value is larger.
Alternatively, in foregoing method, described predefined cylinder pressure value is selected between 3 to 10 barometric pressure.
Alternatively, in foregoing method, the detection in described steps A is undertaken by the crankshaft position sensor of motor.
Alternatively, in foregoing method, described crankshaft position sensor is provided with trigger signal dish, and the state-detection that described piston is positioned at described top dead center is undertaken detecting by the feature tooth of described trigger signal dish.
Alternatively, in foregoing method, the corner deviation between the tooth be detected when described feature tooth and described engine piston arrive lower dead center is greater than 20 degree.
Alternatively, in foregoing method, described motor is also provided with camshaft-signal sensor, wherein,
When described camshaft-signal sensor normally works, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described camshaft-signal sensor to judge;
When described camshaft-signal sensor fault, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described cylinder pressure sensor to judge.
Alternatively, in foregoing method, described motor is also provided with camshaft-signal sensor, wherein,
When described cylinder pressure sensor normally works, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described cylinder pressure sensor to judge;
When described cylinder pressure sensor fault, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described camshaft-signal sensor to judge.
As can be seen from above, according to determination methods of the present invention, when crankshaft position sensor detects that piston is positioned at top dead center, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize cylinder pressure sensor to judge.Its advantage is, this makes it possible to the installation cancelling camshaft-signal sensor, reduces system cost.
On the other hand, if do not cancel camshaft-signal sensor, also use another sensor to carry out above-mentioned judgement under can realizing the situation lost efficacy at one of both camshaft-signal sensor or cylinder pressure sensor, still can carry out stable control to motor, improve the reliability of system.
[accompanying drawing explanation]
With reference to accompanying drawing, disclosure of the present invention will be more obvious.Should understand, these accompanying drawings only for illustration of object, and be not intended to limit protection scope of the present invention.In figure:
Fig. 1 schematically shows the flow chart according to timing judgment method for engine of the present invention; And
Cylinder pressure signal during Fig. 2 schematically shows and judges according to engine timing of the present invention and the graph of a relation of crankshaft signal.
[embodiment]
Explain the specific embodiment of the present invention with reference to the accompanying drawings.Following explanation is only illustrative, exemplary.In addition, be illustrated at this according to the specific embodiment of the present invention, but should understand, some equivalent or similar modification of these embodiments and remodeling also will fall within protection scope of the present invention.
Fig. 1 schematically shows the flow chart according to timing judgment method for engine of the present invention.As can be seen from the figure, namely this determination methods performs steps A after baseline, detects the position of engine piston, if described position is top dead center, advances to step B, otherwise again detect engine piston position.Owing to now can't determine that this top dead center is the top dead center of compression stroke or the top dead center of exhaust stroke, so, in stepb, judge that described top dead center is compression stroke top dead center or exhaust stroke top dead center by cylinder pressure sensor.Wherein, when the cylinder pressure that cylinder pressure sensor detects is greater than predefined cylinder pressure value, judge that described top dead center is compression stroke top dead center; And when the cylinder pressure that cylinder pressure sensor detects is less than predefined cylinder pressure value, judge that described top dead center is exhaust stroke top dead center.In alternative embodiments, described predefined cylinder pressure value and throttle opening positive correlation, throttle opening is larger, and predefined cylinder pressure value is larger, and its preferable range is 3 to 10 atm higher.
Can understand, the detection in steps A can be undertaken by the crankshaft position sensor of motor.Crankshaft position sensor can be the crankshaft position sensor of known different type.Such as, crankshaft position sensor is provided with trigger signal dish, and the state-detection that piston is positioned at top dead center is undertaken detecting by the feature tooth of trigger signal dish.In a more preferred case, the corner deviation between the tooth be detected when feature tooth and engine piston arrive lower dead center is greater than 20 degree, then can ensure the correctness judged.Certainly, if adopt other sensor or device to detect crank position and with of the present invention its integrate features, its technological scheme also will fall within the scope of protection of the present invention.
Motor can also be provided with camshaft-signal sensor, and at this moment, when camshaft-signal sensor normally works, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize camshaft-signal sensor to judge; When camshaft-signal sensor fault, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize cylinder pressure sensor to judge.Or on the contrary, when cylinder pressure sensor normally works, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize cylinder pressure sensor to judge; When cylinder pressure sensor fault, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize camshaft sensor to judge.
Cylinder pressure signal during Fig. 2 schematically shows and judges according to engine timing of the present invention and the graph of a relation of crankshaft signal.Particularly, lack the crankshaft signal dish of 2 teeth for 60 teeth, Fig. 2 illustrates cylinder pressure of engines signal and the crankshaft signal corresponding relation of (motor is not yet lighted a fire) in start-up course.2 hypodontia signals (in figure 1,2 positions) can be detected in an engine operational cycle, in engine control software, when hypodontia signal being detected, check the signal of cylinder pressure sensor, if cylinder pressure signal is greater than the pressure limit of setting, then judge that this position is as this cylinder compression stroke, if cylinder pressure signal is less than the pressure limit of setting, then judge that this position is the exhaust stroke of this cylinder.Therefore just can judge rapidly the job order of cylinder, carry out corresponding oil spout IGNITION CONTROL.
Present embodiment is arranged for different engine crankshaft signal panel, and the difference cylinder mounting point of cylinder pressure sensor can be suitable for.But preferably ensure that the corner deviation of feature tooth and piston lower dead center is more than 20 degree, to ensure the reliability of this timing determination methods.The situation on difference cylinder is arranged on, corresponding cylinder numbers in only needing change timing to judge for cylinder pressure sensor.
For motor having been installed the situation of camshaft-signal sensor and cylinder pressure sensor simultaneously, when finding camshaft-signal sensor fault, signal can be pressed to proceed timing according to cylinder and judge.When hypodontia signal being detected, checking cylinder pressure signal, if cylinder pressure signal is greater than the pressure limit of setting, then judging that this position is compression stroke, if cylinder pressure signal is less than the pressure limit of setting, then judge that this position is the exhaust stroke of this cylinder.Because the cylinder pressure numerical value in engine operation process and the cylinder in start-up course press numerical value to have bigger difference, the pressure limit of setting is different from the pressure limit adopted in start-up course, needs to test on stand in advance to determine.
As can be seen from the above, the present invention is directed to the motor being provided with cylinder pressure sensor to have employed the method that cylinder pressure sensor combines with crankshaft sensor and judge engine timing, timing can be judged rapidly in start-up course, thus carry out lighting a fire and Injection Control, traditional camshaft-signal sensor can be cancelled, reduce system cost.Also for the system still with camshaft-signal sensor, when camshaft-signal sensor breaks down, cylinder pressure sensor can be adopted to continue to realize the function of timing judgement, ensures the normal work of motor, improve the reliability of system.
As mentioned above, with reference to the accompanying drawings the preferred embodiment of the present invention is described in detail.Person of ordinary skill in the field can understand, although be not described in detail each technological scheme completely in this reason as space is limited, but disclosed the basic principle of each technological scheme of the present invention, thus these technological schemes embodiment institute letter lid disclosed in this specification in fact.Certainly, these technological schemes and equivalent thereof also will fall in the protection domain that limited by claims of the present invention.
Claims (8)
1. a timing judgment method for engine, described method comprises the steps:
Steps A: the position detecting engine piston, if described position is top dead center, advances to step B, otherwise again detect;
Step B: judge that described top dead center is compression stroke top dead center or exhaust stroke top dead center,
It is characterized in that,
Judgement in described step B can be undertaken by cylinder pressure sensor, and
When the cylinder pressure that described cylinder pressure sensor detects is greater than predefined cylinder pressure value, judge that described top dead center is compression stroke top dead center; And
When the cylinder pressure that described cylinder pressure sensor detects is less than predefined cylinder pressure value, judge that described top dead center is exhaust stroke top dead center.
2. the method for claim 1, is characterized in that, described predefined cylinder pressure value is directly proportional to the throttle opening of motor.
3. the method for claim 1, is characterized in that, described predefined cylinder pressure value is selected between 3 to 10 barometric pressure.
4. the method for claim 1, is characterized in that,
Detection in described steps A is undertaken by the crankshaft position sensor of motor.
5. method as claimed in claim 4, it is characterized in that, described crankshaft position sensor is provided with trigger signal dish, and the state-detection that described piston is positioned at described top dead center is undertaken detecting by the feature tooth of described trigger signal dish.
6. method as claimed in claim 5, it is characterized in that, the corner deviation between the tooth be detected when described feature tooth and described engine piston arrive lower dead center is greater than 20 degree.
7. the method according to any one of claim 1 to 6, is characterized in that, described motor is also provided with camshaft-signal sensor, wherein,
When described camshaft-signal sensor normally works, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described camshaft-signal sensor to judge;
When described camshaft-signal sensor fault, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described cylinder pressure sensor to judge.
8. the method according to any one of claim 1 to 6, is characterized in that, described motor is also provided with camshaft-signal sensor, wherein,
When described cylinder pressure sensor normally works, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described cylinder pressure sensor to judge;
When described cylinder pressure sensor fault, described top dead center is as compression stroke top dead center or exhaust stroke top dead center to utilize described camshaft-signal sensor to judge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010620370.7A CN102562338B (en) | 2010-12-29 | 2010-12-29 | Timing judgment method for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010620370.7A CN102562338B (en) | 2010-12-29 | 2010-12-29 | Timing judgment method for engine |
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| Publication Number | Publication Date |
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| CN102562338A CN102562338A (en) | 2012-07-11 |
| CN102562338B true CN102562338B (en) | 2015-04-15 |
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| CN201010620370.7A Expired - Fee Related CN102562338B (en) | 2010-12-29 | 2010-12-29 | Timing judgment method for engine |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103940554B (en) * | 2013-01-22 | 2016-06-22 | 上海汽车集团股份有限公司 | Fault Diagnosis of Engine and equipment |
| FR3074526B1 (en) | 2017-12-01 | 2019-10-18 | Continental Automotive France | METHOD FOR SYNCHRONIZING A THERMAL MOTOR |
| CN112213110A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Method and system for measuring phase of driving cam of high-pressure oil pump of gasoline engine and storage medium |
| CN112213111A (en) * | 2020-09-29 | 2021-01-12 | 上汽通用五菱汽车股份有限公司 | Engine timing measurement method and system and storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1470756A (en) * | 2002-06-13 | 2004-01-28 | 爱三工业株式会社 | Stroke determining method of IC engine and stroke determining apparatus using said method |
| CN1869414A (en) * | 2005-05-12 | 2006-11-29 | 富士通天株式会社 | Variable valve control apparatus |
| CN201277099Y (en) * | 2008-09-24 | 2009-07-22 | 张和君 | Electric-controlled work system used for petrol engine motorboat and its motorboat |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0227672D0 (en) * | 2002-11-27 | 2003-01-08 | Ricardo Consulting Eng | Improved engine management |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1470756A (en) * | 2002-06-13 | 2004-01-28 | 爱三工业株式会社 | Stroke determining method of IC engine and stroke determining apparatus using said method |
| CN1869414A (en) * | 2005-05-12 | 2006-11-29 | 富士通天株式会社 | Variable valve control apparatus |
| CN201277099Y (en) * | 2008-09-24 | 2009-07-22 | 张和君 | Electric-controlled work system used for petrol engine motorboat and its motorboat |
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| CN102562338A (en) | 2012-07-11 |
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