CN103278332A - Method for detecting fire catching of air cylinder in starting process of engine - Google Patents
Method for detecting fire catching of air cylinder in starting process of engine Download PDFInfo
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- CN103278332A CN103278332A CN2013102061397A CN201310206139A CN103278332A CN 103278332 A CN103278332 A CN 103278332A CN 2013102061397 A CN2013102061397 A CN 2013102061397A CN 201310206139 A CN201310206139 A CN 201310206139A CN 103278332 A CN103278332 A CN 103278332A
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Abstract
The invention relates to a method for detecting fire catching of an air cylinder in the starting process of an engine. The method includes the steps of impulse wave data collecting, transient rotating speed accurate calculating, rotating speed curve plotting, fire catching situation judging and the like. The method is simple and accurate in control, simple in equipment used and low in cost. The method for detecting the fire catching of the air cylinder in the starting process of the engine is applicable to fire catching detection of engines of various vehicles.
Description
Technical field
The present invention relates to the automobile detection range, be specifically related to the detection method that a kind of engine start process is caught fire to cylinder.
Background technology
Vehicle motor in the development experiments in early stage since engine component do not match or parameter calibration unreasonable, and the generation of the phenomenon that causes catching fire.For fear of the generation of above-mentioned situation, guarantee the performance of engine, in the development experiments process, need to judge exactly and identify the information of catching fire, and take appropriate measures and improve, with the performance of optimization engine.At present, in the development experiments of engine, the most frequently used detection method is: gather pressure signal in the cylinder by collecting device, analyze inner pressure of air cylinder according to the pressure signal of gathering then and change, situation about changing according to pressure is determined the cylinder information of catching fire.
There is following defective in above-mentioned detection method: need outfit pressure transducer and support equipment thereof that the pressure signal in the cylinder is gathered, and the cost of the said equipment is high, and expensive.And engine is when starting, and burning is extremely unstable, and order is caught fire, carbon distribution and flood the cylinder probability and sharply increase, and is very easy to damage pressure transducer, and changing pressure transducer can increase cost.
In addition, some detection methods that also have other in the prior art, for example: CKP is set on the bent axle, detect the corner information of bent axle by CKP, then the information of CKP is calculated the rotary speed information of bent axle, and then can analyze the rotation speed change of each cylinder, but above-mentioned detection means equally can only be to the rotation speed change under the engine steady state operating mode, still can not effectively detect for the transient changing of engine start process.
Summary of the invention
In order to solve the above-mentioned deficiency of existing in prior technology, the invention provides the detection method that a kind of engine start process is caught fire to cylinder, detect the angle signal that engine crankshaft rotates a week, every interval equal angular is carried out a rotating speed to bent axle and is calculated then, all rotating speeds that will calculate at last are depicted as curve map, by observe curve map can intuitive judgment engine start process in cylinder situation on fire, and in time make corresponding measure.
For achieving the above object, the technical solution adopted in the present invention is as follows:
A kind of engine start process may further comprise the steps the detection method that cylinder catches fire:
(1) pulse wave data collection: produce mechanism by the pulsating wave that arranges, send pulsatile once ripple signal every angle beta, all pulsating waves that produce by pulsating wave collecting mechanism paired pulses ripple generation mechanism are gathered simultaneously;
(2) transient rotative speed calculates: the information that the pulsating wave collecting mechanism is gathered in the main control unit receiving step () is computer capacity with the interval angle [alpha] then, and the transient rotative speed value employing formula (2) of engine is calculated continuously:
n
I-=α f/6 (T
(i+(2 α-1))-T
i) ... formula (2)
N in the formula (2)
iFor
-Tachometer value when engine impulse ripple generation mechanism produces i pulsating wave, f is the sample frequency of pulsating wave collecting mechanism, T
iBe counting of i the residing sampled point of pulsating wave rising edge;
(3) speed curves is drawn: main control unit is horizontal ordinate with the crank angle, is ordinate to start rotating speed, the engine transient tachometer value that calculates in the step (two) is demarcated, and be depicted as curve;
(4) situation of catching fire is judged: the curve map that the staff draws according to step (three) is judged the situation of the cylinder that catches fire.
As a kind of restriction of the present invention: β in the described step ()=0.5 °, comprise 5 sampled points at least in the pulsating wave of the every collection of pulsating wave collecting mechanism, be used for setting sample frequency.
As another kind of the present invention is limited: the α value is not more than 3 ° in the computing formula of described step (two), and the value of f is not less than 70000HZ.
As further restriction: α=3 ° in the computing formula of described step (two), f=70000HZ.
As the third restriction of the present invention: being judged as the engine fire situation in the described step (four): with reference to the curve of drawing, when back one rotating speed trough value (or crest value) is starkly lower than last rotating speed trough value (or crest value), perhaps this rotating speed trough value (or crest value) is in front and back trough values (or crest value) during inharmonious the appearance, then proves the cylinder of living in situation of catching fire.
Produce the restriction of mechanism and pulsating wave collecting mechanism as the paired pulses ripple: it is the scrambler of being located on the engine that described pulsating wave produces mechanism; The pulsating wave collecting mechanism is capture card; Main control unit is the PC that is provided with encoder pulse ripple signal processing software and mapping software.
Because adopted above technical scheme, the present invention can reach following technique effect:
(1) the present invention by pulsating wave produce mechanism can equal angles the angle displacement of collecting crankshaft at interval, and send pulse signal, after gathering, the pulsating wave that the pulsating wave collecting mechanism produces above-mentioned pulsating wave generation mechanism sends main control unit to, main control unit can calculate the continuous tachometer value of bent axle, and be depicted as curve, just can observe the cylinder situation of catching fire intuitively according to the curve staff, and the position that catches fire, can accurately judge catch fire circulation and the cylinder that catches fire in the engine start process;
(2) adopt equipment such as scrambler and capture card to carry out information acquisition, simple in structure, cost is low, need not expensive pressure transducer and support equipment thereof, and the spoilage of equipment is extremely low;
(3) conventional equipments such as scrambler that use of the present invention are easy for installation, and the analytical approach of data is simple, thereby time saving and energy saving when making the present invention install and use.
In sum, method control of the present invention is accurately simple, and employed equipment is simple, and is with low cost.The present invention is applicable to the detection of catching fire of the engine of various vehicles.
Description of drawings
Fig. 1 is the control flow chart of the embodiment of the invention;
Fig. 2 is the curve map that the embodiment of the invention detects for a certain engine.
Embodiment
The detection method that a kind of engine start process of embodiment is caught fire to cylinder
The detection method that a kind of engine start process that present embodiment provides is caught fire to cylinder as shown in Figure 1, comprises step:
(1) pulse wave data collection
Produce mechanism by the pulsating wave that arranges, send pulsatile once ripple signal every angle beta, all pulsating waves that produce by pulsating wave collecting mechanism paired pulses ripple generation mechanism are gathered simultaneously.
β in the present embodiment=0.5 °, be that the bent axle revolution is crossed 0.5 °, pulsating wave produces mechanism and sends the pulsatile once ripple, and meet the requirements for the waveform that guarantees the pulsating wave that the pulsating wave collecting mechanism collects, at least comprise 5 sampled points in the pulsating wave of the every collection of pulse collection mechanism, and adopt scrambler as the pulsating wave generation device in the present embodiment, adopt capture card as the pulsating wave collecting mechanism, when arranging, scrambler can be fixedly arranged on crankshaft front end or the rear end of engine, carries out the collection of angular displacement in the time of can rotating bent axle as long as guarantee scrambler.
(2) transient rotative speed accurate Calculation
The information that the pulsating wave collecting mechanism is gathered in the main control unit receiving step () is computer capacity with the interval angle [alpha] then, and the transient rotative speed value of engine is calculated continuously.Adopt PC as main control unit in this step, the signal output part of the capture card in the signal input part Connection Step () of described main control unit, therefore, main control unit can receive the pulse wave signal that capture card collects in real time, and be computer capacity with the angle [alpha] by existing calculation procedure, the transient rotative speed value n of calculation engine continuously
i, i.e. angle calculation n between 0 ° and α
0, in the angle between 1 ° and (α+1 °), calculate n
1, calculate n always
i, the value of i is determined according to the number of the pulsating wave of gathering.
When present embodiment calculates, be principle with " rotating speed=angle/time ", be specially:
n
i=α/(360/60) * [(T
(i+(2 α-1))-T
i)/f] ... formula (1)
In the formula (1): n
iFor
-The tachometer value of engine during i pulsating wave that motor encoder is sent, f is the sample frequency of sampling card, T
iBe counting of i pulsating wave rising edge sampled point of living in, then T
(i+ (2 α-1))Be counting of i+2 α pulsating wave rising edge sampled point of living in, T
(i+ (2 α-1))-T
i) the difference of counting between being, and the frequency of capture card is f, and namely capture card 1s can collect f point, and the time of gathering between two consecutive point is 1/f, and therefore, interlude is (T between i pulsating wave and the individual pulsating wave of i+ (2 α-1)
(i+ (2 α-1))-T
i)/f, and at interval angle is α between i pulsating wave and the individual pulsating wave of i+ (2 α-1), converts rotating speed 1r/min to 360 °/60s then, therefore obtains above-mentioned formula (1), formula (1) is carried out abbreviation obtain:
n
I-=α f/6 (T
(i+ (2 α-1))-T
i) ... formula (2)
Therefore, step (two) finally obtains continuous bent axle transient rotative speed value according to formula (2).For the degree of accuracy that guarantees to calculate, the α in the present embodiment≤3 °, and in order to guarantee to collect the complete pulse waveform, namely comprise at least 5 sampled points in a pulsating wave, f 〉=70000HZ in the present embodiment.
(3) speed curves is drawn
Main control unit is horizontal ordinate with the crank angle, is ordinate to start rotating speed, to the engine transient tachometer value n that calculates in the step (two)
iDemarcate, and be depicted as curve.
Owing to store corresponding encoder pulse ripple signal processing software and curves drawing software (for existing curves drawing software) in the main control unit, so main control unit can be with the n that calculates
iBeing horizontal ordinate with the crank angle, is to demarcate in the coordinate system of ordinate to start rotating speed, and connects and be depicted as curve, obtains final curve values.
The starting process transient rotative speed curve of the four cylinder engine cylinder of drawing when Figure 2 shows that α=3 °, f=70000HZ.Each cylinder working according to engine in this curve is arranged as one in proper order, three, four, the order of two cylinder, wherein piston stops during original state, the first cylinder piston can be parked in the first cylinder top dead centre and down to optional position between the point, present embodiment setting piston is parked in top dead centre and is original state down to a centre position, this moment, corresponding bent axle was parked in horizontal level, therefore the first cylinder piston is when from then on the position is compressed to top dead centre, a bent axle half-twist, and each cylinder piston compression stroke all can be compressed to top dead centre from lower dead center later on, so 180 ° of crankshaft rotating, the first cylinder compression travel also is half cycle after the circulation, namely 180 °.Therefore, the position of demarcating a cylinder at last is 0 ° to 90 ° of horizontal ordinate, the position of two cylinder be after 90 ° to 270 °, the position of three cylinders be after 270 ° to 450 °, the position of four cylinders be after 450 ° to 630 °, 630 ° later on again circulation be a cylinder.
(4) situation of catching fire is judged
The curve map that the staff draws according to step (three) is judged the situation of the cylinder that catches fire.Being judged as the situation of catching fire in this step: with reference to the curve of drawing, when back one rotating speed trough value (or crest value) is starkly lower than last rotating speed trough value (or crest value), perhaps this rotating speed trough value (or crest value) is in front and back trough values (or crest value) during inharmonious the appearance, then proves the cylinder of living in situation of catching fire.
Among Fig. 2, can obviously observe the obvious inharmonious appearance of two place's waveforms, according to the number of degrees of horizontal ordinate as can be known a cylinder be the cylinder that catches fire.
The computing method that present embodiment adopts are simple, but can the rotating speed of bent axle be calculated accurately, can observe the cylinder that catches fire whether occurs intuitively by the curve of drawing then, and the position of the cylinder that catches fire, remind the staff in time to take treatment measures.
Claims (7)
1. an engine start process is characterized in that the detection method that cylinder catches fire, and this detection method may further comprise the steps:
(1) pulse wave data collection
Produce mechanism by the pulsating wave that arranges, send pulsatile once ripple signal every angle beta, all pulsating waves that produce by pulsating wave collecting mechanism paired pulses ripple generation mechanism are gathered simultaneously;
(2) transient rotative speed accurate Calculation:
The information that the pulsating wave collecting mechanism is gathered in the main control unit receiving step () is computer capacity with the interval angle [alpha] then, and the transient rotative speed value employing formula (2) of engine is calculated continuously:
n
I-=α f/6 (T
(i+(2 α-1))-T
i) ... formula (2)
N in the formula (2)
iFor
-Tachometer value when engine impulse ripple generation mechanism produces i pulsating wave, f is the sample frequency of pulsating wave collecting mechanism, T
iBe counting of i the residing sampled point of pulsating wave rising edge;
(3) speed curves is drawn
Main control unit is horizontal ordinate with the crank angle, is ordinate to start rotating speed, the engine transient tachometer value that calculates in the step (two) is demarcated, and be depicted as curve;
(4) situation of catching fire is judged
The curve map that the staff draws according to step (three) is judged the situation of the cylinder that catches fire.
2. engine start process as claimed in claim 1 is characterized in that the detection method that cylinder catches fire:
β is 0.5 ° in the described step (), comprises 5 sampled points at least in the pulsating wave of the every collection of pulsating wave collecting mechanism, is used for setting sample frequency.
3. engine start process according to claim 1 and 2 is characterized in that the detection method that cylinder catches fire: α≤3 ° in the computing formula of described step (two), f 〉=70000HZ.
4. engine start process according to claim 3 is characterized in that the detection method that cylinder catches fire: α=3 ° in the computing formula of described step (two), f=70000HZ.
5. according to any described engine start process in the claim 1 to 4 detection method that cylinder catches fire be is characterized in that being judged as the engine fire situation in the described step (four):
With reference to the curve of drawing, when 1. back one rotating speed trough value was starkly lower than last rotating speed trough value, perhaps this rotating speed trough value then proved the cylinder of living in situation of catching fire in the trough value of front and back during inharmonious the appearance; When 2. back one rotating speed crest value was starkly lower than last rotating speed crest value, perhaps this rotating speed crest value then proved the cylinder of living in situation of catching fire in the crest value of front and back during inharmonious the appearance.
6. according to any described engine start process in the claim 1 to 4 detection method that cylinder catches fire be is characterized in that: it is the scrambler of being located on the engine that described pulsating wave produces mechanism; The pulsating wave collecting mechanism is capture card; Main control unit is the PC that is provided with encoder pulse ripple signal processing software and mapping software.
7. engine start process according to claim 5 is characterized in that the detection method that cylinder catches fire: it is the scrambler of being located on the engine that described pulsating wave produces mechanism; The pulsating wave collecting mechanism is capture card; Main control unit is the PC that is provided with encoder pulse ripple signal processing software and mapping software.
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| CN201310206139.7A CN103278332B (en) | 2013-05-29 | 2013-05-29 | The engine startup detection method to cylinder misfire |
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| CN201310206139.7A CN103278332B (en) | 2013-05-29 | 2013-05-29 | The engine startup detection method to cylinder misfire |
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| CN103278332B CN103278332B (en) | 2016-08-10 |
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Cited By (3)
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| CN106555682A (en) * | 2016-11-16 | 2017-04-05 | 中国北方发动机研究所(天津) | A kind of changeable air valve control method for reducing diesel engine starting operating mode noxious emission |
| CN107237699A (en) * | 2017-06-20 | 2017-10-10 | 上海工程技术大学 | A kind of high-power multiple spot EFI gas engine fire detection method and detection means |
| CN109269810A (en) * | 2017-07-17 | 2019-01-25 | 山东交通学院 | A kind of engine fire fault diagnosis method based on the identification of mass center generalized force |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555682A (en) * | 2016-11-16 | 2017-04-05 | 中国北方发动机研究所(天津) | A kind of changeable air valve control method for reducing diesel engine starting operating mode noxious emission |
| CN107237699A (en) * | 2017-06-20 | 2017-10-10 | 上海工程技术大学 | A kind of high-power multiple spot EFI gas engine fire detection method and detection means |
| CN107237699B (en) * | 2017-06-20 | 2019-11-12 | 上海工程技术大学 | A kind of high-power multiple spot EFI gas engine fire detection method and detection device |
| CN109269810A (en) * | 2017-07-17 | 2019-01-25 | 山东交通学院 | A kind of engine fire fault diagnosis method based on the identification of mass center generalized force |
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