CN102678362A - System of phase-free sensor for identifying one cylinder compression TDC (Top Dead Center) of three-cylinder engine - Google Patents
System of phase-free sensor for identifying one cylinder compression TDC (Top Dead Center) of three-cylinder engine Download PDFInfo
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- CN102678362A CN102678362A CN201210153596XA CN201210153596A CN102678362A CN 102678362 A CN102678362 A CN 102678362A CN 201210153596X A CN201210153596X A CN 201210153596XA CN 201210153596 A CN201210153596 A CN 201210153596A CN 102678362 A CN102678362 A CN 102678362A
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Abstract
The invention discloses a system of a phase-free sensor for identifying one cylinder compression TDC (Top Dead Center) of a three-cylinder engine. The system comprises a crankshaft position sensor, a pulse disk, a storage battery voltage acquisition module and a cylinder judging module, wherein the storage battery voltage acquisition module is used for collecting and outputting voltage of a storage battery to the cylinder judging module; the cylinder judging module detects transient spike voltage generated by the crankshaft position sensor; if the transient spike voltage gets distortion, the storage battery voltage corresponding to an Eth transient spike voltage generating time before the transient spike voltage gets distortion is minus the storage battery voltage corresponding to an Fth transient spike voltage generating time before the transient spike voltage gets distortion to obtain a difference value; and according to the comparison of the difference value with a positive exhaust valve value and a negative compression valve value, a compression TDC signal or an exhaust TDC signal is output. The system of the phase-free sensor for identifying one cylinder compression TDC of the three-cylinder engine has brief logic and convenience in hardware realization.
Description
Technical field
The present invention relates to the engine electric control fuel oil spraying technology, particularly a kind of system and method for non-phase sensor identification three cylinder engine 1 cylinder compression top center.
Background technique
Engine electric control fuel oil spraying system becomes the main flow of current engine electric-controlled technology with its accurate control and response fast.The electric control fuel oil jet system of four stroke engine comprises ECU (electronic control unit), sensor and final controlling element three parts, wherein generally adopts magnetic induction sensor to measure rotary speed information and crank position information.
Magnetic induction sensor cooperates pulse disc to measure crank position; Pulse disc is installed on the bent axle, rotates with bent axle, and pulse disc has the equally distributed gear teeth (being generally 60); But several (being generally 2) gear teeth vacancy is arranged; The gear teeth on the pulse disc produce dissection to the magnetic line of force of magnetic induction sensor, produce the alternating voltage signal of certain frequency at magnetic induction sensor coil two ends, export to ECU; And the hypodontia position (BM) on pulse wheel whenever through magnetic induction sensor once, just in the magnetic induction sensor inductor coil, produces the alternating voltage signal of a distortion, and ECU just can calculate the rotating speed and the crank position of motor in view of the above.In the one action circulation, crankshaft rotating two circles, the signal of magnetic induction sensor can make ECU pick out the top dead center twice of 1 cylinder, is compression top center or exhaust top dead center but can't distinguish this top dead center.This just needs camshaft phase sensor and magnetic induction sensor to cooperatively interact, and for ECU provides crank phase information, thereby accurately judges the compression top center and the exhaust top dead center of 1 cylinder.
Camshaft phase sensor is a Hall transducer, cooperates signal wheel (permanent magnet of semicircle, 1 or 4 tooth), and this signal wheel is installed on the camshaft, rotates with camshaft.Along with the rotation of signal wheel, according to Hall effect, the Hall transducer internal magnetic field changes, thereby the electrical signal that output changes is given ECU.In the one action circulation; Camshaft revolves and turns around, and crankshaft rotating two circles, camshaft phase sensor is just in time opposite at the electrical signal of the output of 1 cylinder compression top center and 1 cylinder exhaust top dead center; In view of the above; ECU can accurately judge the compression top center and the exhaust top dead center of 1 cylinder, thus with the motor accurate synchronization, realize the fuel oil sequence-injection.
The method of identification four cylinder engine 1 cylinder compression top center of current existing multiple no camshaft phase sensor.
DELPHI company has worked out a kind of method (being derived from " Intelligent Calibration systematic research in the EMS engine management system ") of declaring cylinder through suction pressure.When cylinder throws open at the intake stroke intake valve, have the rapid pressure drop about 1kPa near near the mainfold presure the intake valve, as shown in Figure 1.ECU carries out separating treatment to this signal through high-pass filtering and lower pass-filter, and the relevant fuel feeding logic of motor is handled in high-pass filtering, and lower pass-filter realizes declaring cylinder through software processes.The suction pressure Changing Pattern repeats to occur in a scope generally speaking, and when intake valve was opened suddenly, pressure descended rapidly near it, got rid of fortuitous phenomena, can realize accurately declaring cylinder when ECU detects 5 this pressure drops.This method is not enough is for realizing this function, and air inlet pressure sensor need be installed in the 1st cylinder or the 4th cylinder manifold position near intake valve.
Chinese patent 200710094027 discloses a kind of " method of non-phase sensor recognizing one cylinder compression top center "; This method at first adopts injection in groups or sequence-injection to pilot engine under the situation of non-phase sensor; In motor success starting speed is leapt high and then fallen down the process of idling; Initiatively cut off the oil spout of 1 cylinder, discern 1 cylinder compression top center according to the fluctuation pattern of engine speed.The fluctuation pattern of described engine speed is: after the oil spout of initiatively cutting off 1 cylinder, occur continuously catching fire if ECU detects 1 cylinder, can judge that then the former sync state between ECU and the motor is correct; Occur continuously catching fire if ECU detects 4 cylinders, then can judge the former sync state mistake between ECU and the motor.
The four-cylinder gasoline engine cylinder number is an even number; Each cylinder differs 180 ° of CA (1 ° of CA representes that bent axle once rotates in 360 degree) in the same circulation; As shown in Figure 2, in each moment of four-cylinder gasoline engine work, air inlet, compression, acting, exhaust stroke all have a cylinder carrying out.The cylinder number of three cylinder gasoline engines is an odd number, and each cylinder differs 240 ° of CA igniting once in the same work cycle, and is as shown in Figure 3, and three cylinder machines only have three strokes carrying out in each moment of work, and each cylinder is not to be in symmetrical position.So two kinds of motors are not having under the prerequisite of camshaft phase sensor; The rule of various signals is different; The strategy of utilization also is distinct; Experiment showed, the method for above two kinds of existing non-phase sensor identification petrol engine 1 cylinder compression top centers, can't be applicable to three cylinder gasoline engines.
Summary of the invention
The technical problem that the present invention will solve provides a kind of system of non-phase sensor identification three cylinder engine 1 cylinder compression top center, and logic is succinct, and hardware is realized convenient.
For solving the problems of the technologies described above, the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center of the present invention comprises crankshaft position sensor, pulse disc, battery tension acquisition module, declares the cylinder module;
Said pulse disc is installed on the bent axle, rotates with bent axle, and pulse disc has the equally distributed gear teeth, but one or more adjacent teeth vacancies are arranged;
Said crankshaft position sensor, along with the rotation of said pulse disc produces with the corresponding instantaneous peak value voltage of the pulse disc gear teeth, the hypodontia position per pass on the pulse wheel, a distortion just takes place in the instantaneous peak value voltage that crankshaft position sensor produces;
Said battery tension acquisition module, the voltage that is used to gather the storage battery that is output as the power supply of said motor is declared the cylinder module to said;
Saidly declare the cylinder module, job step is:
One. power on and initialization;
Two. detect the instantaneous peak value voltage that said crankshaft position sensor produces;
Three. if instantaneous peak value voltage produces distortion, carries out step 4, otherwise carries out step 2;
Four. if instantaneous peak value voltage produces instantaneous peak value number of voltages before the distortion more than or equal to E, and E is 40% to 60% a positive integer of the total number of teeth of pulse wheel, carries out step 5, otherwise carries out step 2;
Five. E the instantaneous peak value voltage that instantaneous peak value voltage produces before the distortion produces pairing battery tension constantly; Deduct instantaneous peak value voltage and produce distortion F instantaneous peak value voltage generation before pairing battery tension constantly; Obtain a difference; F is 10% a natural number less than the total number of teeth of pulse wheel, if this difference greater than the exhaust threshold values, is then exported the exhaust top dead center signal; If less than compression threshold, then export the compression top center signal; If between the compression threshold, then carry out step 2 at the exhaust threshold values; Wherein, the exhaust threshold values is a positive number, and compression threshold is a negative.
Preferable, E is 45% to 55% a positive integer of the total number of teeth of pulse wheel, and F is 5% a natural number less than the total number of teeth of pulse wheel.
Preferable, saidly declare the cylinder module, after step 1,, make Starter drag engine rotation when car key forwards enable position to, if crankshaft position sensor and said battery tension acquisition module are in proper working order, carry out step 2, otherwise carry out step 1.
Cylinder is declared by means of the gradient and the CRANK SENSOR completion of battery tension by the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center of the present invention, has realized the correct judgement of three-cylinder gasoline engine motor 1 cylinder compression top center of non-phase sensor; Logic is succinct, calculates simply, because collection is battery tension; Except that crankshaft position sensor, need not other sensors; So need not change by hardware, hardware is realized convenient, has very high feasibility and use value.
Description of drawings
In order to be illustrated more clearly in technological scheme of the present invention; Do simple the introduction in the face of the accompanying drawing that will use required for the present invention down; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the disclosed a kind of method schematic representation of declaring cylinder through suction pressure of DELPHI company;
Fig. 2 is a four-cylinder gasoline engine working procedure schematic representation;
Fig. 3 is three cylinder gasoline engine working procedure schematic representation;
Fig. 4 is system's one mode of execution schematic representation that non-phase sensor of the present invention is discerned three cylinder gasoline engines, 1 cylinder compression top center;
Fig. 5 is that non-phase sensor of the present invention is discerned the working procedure schematic representation of declaring the cylinder module among one embodiment of system of three cylinder gasoline engines, 1 cylinder compression top center;
The synchronously preceding battery tension of Fig. 6 three cylinder gasoline engines changes schematic representation.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technological scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiments.Should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.And under the situation of not conflicting, embodiment and the characteristic among the embodiment among the present invention can make up each other.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtained belongs to the scope that the present invention protects.
It is as shown in Figure 4 that non-phase sensor is discerned system's one mode of execution of three cylinder gasoline engines, 1 cylinder compression top center, comprises crankshaft position sensor, pulse disc, battery tension acquisition module, declares the cylinder module;
Said pulse disc is installed on the bent axle, rotates with bent axle, and pulse disc has the equally distributed gear teeth (being generally 60), but one or more (being generally 2) adjacent teeth vacancy is arranged;
Said crankshaft position sensor, along with the rotation of said pulse disc produces with the corresponding instantaneous peak value voltage of the pulse disc gear teeth, the hypodontia position per pass on the pulse wheel, a distortion just takes place in the instantaneous peak value voltage that crankshaft position sensor produces;
Said battery tension acquisition module, the voltage that is used to gather the storage battery that is output as the power supply of said petrol engine is declared the cylinder module to said;
Saidly declare the cylinder module, job step is as shown in Figure 5:
One. when car key forwards the last electric position (ON) of ignition switch to, make that ECU powers on, the initialized while, declare that the cylinder module powers on and the initialization logic amount;
Two. when car key forwards the enable position of ignition switch to, making Starter drag motor changes, if crankshaft position sensor and said battery tension acquisition module are in proper working order, carries out step 3, otherwise carries out step 1;
Three. detect the instantaneous peak value voltage that said crankshaft position sensor produces;
Four. if instantaneous peak value voltage produces distortion, carries out step 5, otherwise carries out step 3;
Five. if instantaneous peak value voltage produces instantaneous peak value number of voltages before the distortion more than or equal to E, and E is 40% to 60% a positive integer of the total number of teeth of pulse wheel, carries out step 6, otherwise carries out step 3;
Six. E the instantaneous peak value voltage that instantaneous peak value voltage produces before the distortion produces pairing battery tension constantly; Deduct instantaneous peak value voltage and produce distortion F instantaneous peak value voltage generation before pairing battery tension constantly; Obtain a difference; F is 10% a natural number less than the total number of teeth of pulse wheel, if this difference greater than the exhaust threshold values, is then exported the exhaust top dead center signal; If less than compression threshold, then export the compression top center signal; If between the compression threshold, then carry out step 2 at the exhaust threshold values; Wherein, the exhaust threshold values is a positive number, and compression threshold is a negative;
Preferable, E is 45% to 55% a positive integer of the total number of teeth of pulse wheel, and F is 5% a natural number less than the total number of teeth of pulse wheel.
For example the total number of teeth of pulse wheel is 60, and 2 hypodontias are wherein arranged, and E can be 25,26,27,28,29,30,31,32,33,34 or 35, and F can be 5,4,3,2 or 1.For example, E be 25 and F be 5, perhaps E be 25 and F be 3, perhaps E be 25 and F be 1, perhaps E be 30 and F be 5, perhaps E be 30 and F be 2, perhaps E be 30 and F be 1, perhaps E be 35 and F be 4, perhaps E be 35 and F be 3, perhaps E be 35 and F be 1.
The system of non-phase sensor identification three cylinder engine 1 cylinder compression top center of the present invention; The enable position that forwards ignition switch when car key to makes Starter drag engine rotation; Crankshaft position sensor output is with the corresponding instantaneous peak value voltage of each rotation angle gear teeth of pulse disc; In the one action circulation, crankshaft rotating two circles, instantaneous peak value voltage can twice distortion occur because of the pulse disc hypodontia; When wherein a distortion takes place corresponding to the compression top center of 1 cylinder, when another distortion takes place corresponding to the exhaust top dead center of 1 cylinder.When the motor normal operation, suppose that the ignition cylinder preface is 1-2-3, as shown in Figure 6; Pulse disc hypodontia position BM0 before 1 cylinder compression top center comes interim; The stroke that three cylinders are corresponding is respectively compression, air inlet and exhaust, and the pulse disc hypodontia position BM1 before the 1 cylinder exhaust top dead center comes temporarily, and the stroke that three cylinders are corresponding is respectively exhaust, acting and compression; This shows; In one action circulation, crankshaft rotating two circles produce twice top dead center, and the wave properties of the voltage of the storage battery of supplying power for motor that twice budc is corresponding is different certainly.Battery tension UB T variation in time when Starter drags engine rotation; Visible by Fig. 6; Pulse disc rotates 720 degree, and battery tension Changing Pattern corresponding before twice distortion takes place is just in time opposite, (turning to the hypodontia position) pairing battery tension of the setting number gear teeth before takes place as the object of analyzing with distortion; The corresponding instantaneous peak value voltage of setting number of the setting number gear teeth before the distortion takes place in instantaneous peak value voltage; Instantaneous peak value voltage produces distortion E instantaneous peak value voltage generation before pairing battery tension constantly, deducts instantaneous peak value voltage and produces distortion F instantaneous peak value voltage generation before pairing battery tension constantly, obtains a difference; E is about the half the of the total tooth number of pulse wheel; F is much smaller than E, if this difference greater than positive number exhaust threshold values, corresponding crank position is 1 cylinder exhaust top dead center when then judging this instantaneous peak value voltage distortion; If less than the negative compression threshold, judge that then corresponding crank position was 1 cylinder compression top center when distortion took place this instantaneous peak value voltage; If when falling between, then can't distinguish current states, need bent axle to turn around again to drive pulse disc to discern again to next gap position.If instantaneous peak value number of voltages that (turning to the hypodontia position) crankshaft position sensor before produces takes place less than E, then need bent axle to turn around again to drive pulse disc to discern again to next gap position with distortion.Wherein E, F, compression threshold, exhaust threshold values can be demarcated according to detailed programs.
ECU has just accomplished synchronously with motor according to present engine 1 cylinder compression top center of the system identification of non-phase sensor identification three cylinder engine 1 cylinder compression top center of the present invention, and next engine control system EMS just can carry out correct oil spout igniting.When Starter drags engine rotation; Because the igniting of the cylinder fuel injection of three cylinder engine is asymmetric, if discern 1 cylinder top dead center mistake, ECU and motor are not accomplished synchronously; Motor can't be lighted a fire successful; If so also fail to discern the compression top center of 1 cylinder, ECU and motor are not accomplished synchronously, then engine control system EMS control suspends oil spout and igniting.
Cylinder is declared by means of the gradient and the CRANK SENSOR completion of battery tension by the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center of the present invention, has realized the correct judgement of three-cylinder gasoline engine motor 1 cylinder compression top center of non-phase sensor; Logic is succinct, calculates simply, because collection is battery tension; Except that crankshaft position sensor, need not other sensors; So need not change by hardware, hardware is realized convenient, has very high feasibility and use value.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (6)
1. the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center comprises crankshaft position sensor, pulse disc;
Said pulse disc is installed on the bent axle, rotates with bent axle, and pulse disc has the equally distributed gear teeth, but one or more adjacent teeth vacancies are arranged;
Said crankshaft position sensor, along with the rotation of said pulse disc produces with the corresponding instantaneous peak value voltage of the pulse disc gear teeth, the hypodontia position per pass on the pulse wheel, a distortion just takes place in the instantaneous peak value voltage that crankshaft position sensor produces;
It is characterized in that, also comprise the battery tension acquisition module, declare the cylinder module;
Said battery tension acquisition module, the voltage that is used to gather the storage battery that is output as the power supply of said motor is declared the cylinder module to said;
Saidly declare the cylinder module, job step is:
One. power on and initialization;
Two. detect the instantaneous peak value voltage that said crankshaft position sensor produces;
Three. if instantaneous peak value voltage produces distortion, carries out step 4, otherwise carries out step 2;
Four. if instantaneous peak value voltage produces instantaneous peak value number of voltages before the distortion more than or equal to E, and E is 40% to 60% a positive integer of the total number of teeth of pulse wheel, carries out step 5, otherwise carries out step 2;
Five. E the instantaneous peak value voltage that instantaneous peak value voltage produces before the distortion produces pairing battery tension constantly; Deduct instantaneous peak value voltage and produce distortion F instantaneous peak value voltage generation before pairing battery tension constantly; Obtain a difference; F is 10% a natural number less than the total number of teeth of pulse wheel, if this difference greater than the exhaust threshold values, is then exported the exhaust top dead center signal; If less than compression threshold, then export the compression top center signal; If between the compression threshold, then carry out step 2 at the exhaust threshold values; Wherein, the exhaust threshold values is a positive number, and compression threshold is a negative.
2. the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center according to claim 1 is characterized in that,
E is 45% to 55% a positive integer of the total number of teeth of pulse wheel.
3. the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center according to claim 1 is characterized in that,
F is 5% a natural number less than the total number of teeth of pulse wheel.
4. the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center according to claim 1 is characterized in that,
The total number of teeth of pulse wheel is 60, and 2 adjacent teeth vacancies are wherein arranged, and E is 25,26,27,28,29,30,31,32,33,34 or 35, and F is 5,4,3,2 or 1.
5. the system of non-phase sensor identification three cylinder engine 1 cylinder compression top center according to claim 4 is characterized in that,
E be 25 and F be 5, perhaps E be 25 and F be 3, perhaps E be 25 and F be 1, perhaps E be 30 and F be 5, perhaps E be 30 and F be 2, perhaps E be 30 and F be 1, perhaps E be 35 and F be 4, perhaps E be 35 and F be 3, perhaps E be 35 and F be 1.
6. according to the system of each described non-phase sensor identification three cylinder engine 1 cylinder compression top center of claim 1 to 4, it is characterized in that,
Saidly declare the cylinder module, after step 1,, make Starter drag engine rotation, if crankshaft position sensor and said battery tension acquisition module are in proper working order, carry out step 2, otherwise carry out step 1 when car key forwards enable position to.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103953451A (en) * | 2013-05-24 | 2014-07-30 | 潍柴动力股份有限公司 | Method and device for obtaining shutdown cylinder number of engine, and engine |
| CN113029580A (en) * | 2021-03-09 | 2021-06-25 | 西安交通大学 | Engine cylinder pressure data real-time acquisition and combustion characteristic parameter parallel computing system |
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| CN103953451A (en) * | 2013-05-24 | 2014-07-30 | 潍柴动力股份有限公司 | Method and device for obtaining shutdown cylinder number of engine, and engine |
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| CN113029580A (en) * | 2021-03-09 | 2021-06-25 | 西安交通大学 | Engine cylinder pressure data real-time acquisition and combustion characteristic parameter parallel computing system |
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Application publication date: 20120919 |