CN101655042A - Method for identifying top dead center of compression of cylinder 1 of automobile engine - Google Patents
Method for identifying top dead center of compression of cylinder 1 of automobile engine Download PDFInfo
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- CN101655042A CN101655042A CN200910093142A CN200910093142A CN101655042A CN 101655042 A CN101655042 A CN 101655042A CN 200910093142 A CN200910093142 A CN 200910093142A CN 200910093142 A CN200910093142 A CN 200910093142A CN 101655042 A CN101655042 A CN 101655042A
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Abstract
The invention relates to a method for identifying top dead center of compression of cylinder 1 of automobile engine, belonging to the technical field of automobile automatic control. An automobile isstarted, an initial voltage signal of an automobile cam shaft is set into a low level signal by ECU; an engine is started, ECU collects an admission pressure signal of the engine cylinder 1 and an engine cylinder 4 to obtain the maximum value, minimum value and difference of the admission pressure, compared with the differences of the cylinder 1 and the cylinder 4, the synchronous state of the initial voltage signal of the automobile cam shaft, set by the electronic control unit, and the top dead center of compression of the cylinder 1, is determined, when the synchronous state is incorrect, the voltage signal of the cam shaft is adjusted. In the method, a camshaft position sensor is not needed, but the top dead center of compression of cylinder 1 can be identified, so as to carry out accurate synchronization of the engine and ECU and realize accurate sequence injection of fuel oil. The method can save system cost, simplify the design of the engine and obtain dual benefits of economy and technology.
Description
Technical field
The present invention relates to a kind of method of discerning top dead center of compression of cylinder 1 of automobile engine, belong to automobile automatic control technology field.
Background technique
The electric control fuel oil jet system of motor car engine with its control accurately responds rapidly, can realize closed loop control, makes vehicle performance reach advantages such as the best, has occupied the petrol engine market of the modern overwhelming majority.The electric control fuel oil jet system of modern four stroke engine comprises electronic control unit (hereinafter to be referred as ECU), sensor, final controlling element three parts, wherein generally adopts crankshaft position sensor to measure rotary speed information and crank position information.
Common crankshaft position sensor is made up of a pulse disc and an electromagnetic induction sensor, and 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 crank position and rotating speed in view of the above.Though crankshaft position sensor can make ECU discern the top dead center of 1 cylinder, but can't distinguish the compression top center or the exhaust top dead center of 1 cylinder.
CMPS Camshaft Position Sensor matches with crankshaft position sensor, for ECU provides crank phase information, then can distinguish the compression top center and the exhaust top dead center of 1 cylinder.Common CMPS Camshaft Position Sensor is made up of a Hall transducer and a signal wheel (semicircular magnet), 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; The respective phase sensor 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.
Prior art cam shaft position sensor is indispensable for the fuel oil sequence-injection.
Summary of the invention
The objective of the invention is to propose a kind of method of discerning top dead center of compression of cylinder 1 of automobile engine, from saving system cost, simplifying the angle of engine design sets out, do not use CMPS Camshaft Position Sensor, but utilize the air inlet pressure sensor of in air intake branch, installing to gather the suction pressure signal, in the method that need not identification 1 cylinder compression top center under the situation of CMPS Camshaft Position Sensor, thus the correct sequence-injection of realization fuel oil.
The method of the identification top dead center of compression of cylinder 1 of automobile engine that the present invention proposes may further comprise the steps:
(1) open the automotive ignition key operation, the initial voltage signal that vehicle electronic control unit is set automobile camshaft is a high level signal;
(2) pilot engine, after automobile camshaft rotated the 4-8 circle, electronic control unit was repeatedly gathered the suction pressure signal of motor 1 cylinder and 4 cylinders;
(3) electronic control unit obtains the maximum value and the minimum value of suction pressure from the suction pressure signal of motor 1 cylinder repeatedly gathered, and calculates the difference MAP of suction pressure maximum value and suction pressure minimum value
1, from the suction pressure signal of motor 4 cylinders repeatedly gathered, obtain the maximum value and the minimum value of suction pressure, and calculate the difference MAP of suction pressure maximum value and suction pressure minimum value
4
(4) with above-mentioned MAP
1With MAP
4Compare, if MAP
1＞MAP
4, then the compression top center of the camshaft initial voltage signal of vehicle electronic control unit setting and motor 1 cylinder is synchronous, if MAP
4＞MAP
1, then the exhaust top dead center of the camshaft initial voltage signal of vehicle electronic control unit setting and motor 1 cylinder is synchronous;
(5) if the compression top center of camshaft initial voltage signal that vehicle electronic control unit is set and motor 1 cylinder is synchronous, then the voltage signal of vehicle electronic control unit maintenance automobile camshaft is a high level, if the camshaft initial voltage signal that vehicle electronic control unit is set and the exhaust top dead center of motor 1 cylinder are synchronous, then the vehicle electronic control unit automobile is revised as low level with the voltage signal of camshaft.
The method of the identification top dead center of compression of cylinder 1 of automobile engine that the present invention proposes, its advantage is: this method need not CMPS Camshaft Position Sensor, but can discern 1 cylinder compression top center, thereby finish the accurate synchronization of motor and ECU, realize the correct sequence-injection of fuel oil.Therefore the inventive method can be saved system cost, simplifies engine design, obtains the double benefit of economy and technology.
Description of drawings
Fig. 1 is the FB(flow block) of the inventive method.
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
The method of the identification top dead center of compression of cylinder 1 of automobile engine that the present invention proposes, its FB(flow block) may further comprise the steps as shown in Figure 1:
(1) open the automotive ignition key operation, the initial voltage signal that vehicle electronic control unit is set automobile camshaft is a high level signal;
(2) pilot engine, after automobile camshaft rotated the 4-8 circle, electronic control unit was repeatedly gathered the suction pressure signal of motor 1 cylinder and 4 cylinders;
(3) electronic control unit obtains the maximum value and the minimum value of suction pressure from the suction pressure signal of motor 1 cylinder repeatedly gathered, and calculates the difference MAP of suction pressure maximum value and suction pressure minimum value
1, from the suction pressure signal of motor 4 cylinders repeatedly gathered, obtain the maximum value and the minimum value of suction pressure, and calculate the difference MAP of suction pressure maximum value and suction pressure minimum value
4
(4) with above-mentioned MAP
1With MAP
4Compare, if MAP
1＞MAP
4, then the compression top center of the camshaft initial voltage signal of vehicle electronic control unit setting and motor 1 cylinder is synchronous, if MAP
4＞MAP
1, then the exhaust top dead center of the camshaft initial voltage signal of vehicle electronic control unit setting and motor 1 cylinder is synchronous;
(5) if the compression top center of camshaft initial voltage signal that vehicle electronic control unit is set and motor 1 cylinder is synchronous, then the voltage signal of vehicle electronic control unit maintenance automobile camshaft is a high level, if the camshaft initial voltage signal that vehicle electronic control unit is set and the exhaust top dead center of motor 1 cylinder are synchronous, then the vehicle electronic control unit automobile is revised as low level with the voltage signal of camshaft.
The method of identification top dead center of compression of cylinder 1 of automobile engine of the present invention, saved traditional CMPS Camshaft Position Sensor, and be to use the air inlet pressure sensor that is installed in the air intake branch of the engine to obtain the suction pressure signal of motor 1 cylinder and 4 cylinders, ECU for four stroke engine, when starting is synchronous, can't distinguish 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 there are two kinds of possible sync states when starting like this: the correct or sync state mistake of sync state, when sync state is mistake, the voltage signal of camshaft is adjusted.
Introduce content of the present invention in detail below in conjunction with accompanying drawing.The step of this method is as shown in Figure 1:
Open the automotive ignition key operation, ECU initialization camshaft signal is a high level.
Pilot engine, because starting period suction pressure (hereinafter to be referred as MAP) signal is not clearly need wait for a period of time to the MAP signal stabilization, treat to begin to gather the MAP value by air inlet pressure sensor behind the MAP signal stabilization, be used to calculate the MAP sudden change value of 1 cylinder and 4 cylinders, discern 1 cylinder compression top center according to the fluctuation pattern of MAP.
In the starting process of motor, ECU or synchronous with the compression top center of 1 cylinder, perhaps synchronous with the compression top center of 4 cylinders.The fluctuation pattern of above-mentioned MAP is: gather the MAP value behind the MAP signal stabilization, size according to the MAP sudden change judges whether the initialized camshaft signal of ECU is synchronous with the motor previous condition, if the MAP sudden change value of 1 cylinder greater than the MAP sudden change value of 4 cylinders, can judge that then the former sync state between initialized camshaft signal of ECU and the motor is correct; Not then can judge former sync state mistake between initialized camshaft signal of ECU and the motor.As shown in Figure 2, 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 1 expression ECU of cylinder counter thinks, the compression top center of 2 cylinders that 2 expression ECU think, the compression top center of 3 cylinders that 3 expression ECU think, the compression top center of 4 cylinders that 4 expression ECU think.The I zone is depicted as the stage before the MAP signal stabilization among Fig. 2, and the II zone is depicted as the MAP signal stabilization and begins to gather the MAP signal and calculate the MAP sudden change value stage, and the III zone discerned for 1 cylinder compression top center stage for ECU according to situation about detecting.Shown in Figure 2 is ECU is the correct situation of former sync state between initialization camshaft signal and the motor when no CMPS Camshaft Position Sensor starting, does not need sync state is made amendment.
If the former sync state between initialized camshaft signal of ECU and the motor is correct, then keep this correct sync state; If the former sync state mistake between initialized camshaft signal of ECU and the motor is then adjusted to correct sync state according to the compression top center of 1 cylinder.The situation of the former sync state mistake that Fig. 3 represents between the initialization camshaft signal that is ECU when no CMPS Camshaft Position Sensor starting and the motor, can judge that ECU is the compression top center of 1 cylinder to the conjecture of the exhaust top dead center mistake of 1 cylinder this moment, and therefore initialized camshaft signal 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.
Claims (1)
1, a kind of method of discerning top dead center of compression of cylinder 1 of automobile engine is characterized in that this method may further comprise the steps:
(1) open the automotive ignition key operation, the initial voltage signal that vehicle electronic control unit is set automobile camshaft is a high level signal;
(2) pilot engine, after automobile camshaft rotated the 4-8 circle, electronic control unit was repeatedly gathered the suction pressure signal of motor 1 cylinder and 4 cylinders;
(3) electronic control unit obtains the maximum value and the minimum value of suction pressure from the suction pressure signal of motor 1 cylinder repeatedly gathered, and calculates the difference MAP of suction pressure maximum value and suction pressure minimum value
1, from the suction pressure signal of motor 4 cylinders repeatedly gathered, obtain the maximum value and the minimum value of suction pressure, and calculate the difference MAP of suction pressure maximum value and suction pressure minimum value
4
(4) with above-mentioned MAP
1With MAP
4Compare, if MAP
1＞MAP
4, then the compression top center of the camshaft initial voltage signal of vehicle electronic control unit setting and motor 1 cylinder is synchronous, if MAP
4＞MAP
1, then the exhaust top dead center of the camshaft initial voltage signal of vehicle electronic control unit setting and motor 1 cylinder is synchronous;
(5) if the compression top center of camshaft initial voltage signal that vehicle electronic control unit is set and motor 1 cylinder is synchronous, then the voltage signal of vehicle electronic control unit maintenance automobile camshaft is a high level, if the camshaft initial voltage signal that vehicle electronic control unit is set and the exhaust top dead center of motor 1 cylinder are synchronous, then the vehicle electronic control unit automobile is revised as low level with the voltage signal of camshaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910093142A CN101655042A (en) | 2009-09-29 | 2009-09-29 | Method for identifying top dead center of compression of cylinder 1 of automobile engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910093142A CN101655042A (en) | 2009-09-29 | 2009-09-29 | Method for identifying top dead center of compression of cylinder 1 of automobile engine |
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| CN101655042A true CN101655042A (en) | 2010-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910093142A Pending CN101655042A (en) | 2009-09-29 | 2009-09-29 | Method for identifying top dead center of compression of cylinder 1 of automobile engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678362A (en) * | 2012-05-16 | 2012-09-19 | 联合汽车电子有限公司 | System of phase-free sensor for identifying one cylinder compression TDC (Top Dead Center) of three-cylinder engine |
| CN107035561A (en) * | 2015-12-16 | 2017-08-11 | 现代自动车株式会社 | Engine synchronization device and its control method |
| CN114922731A (en) * | 2022-05-09 | 2022-08-19 | 潍柴动力股份有限公司 | Method and device for detecting signal loss fault of crankshaft/camshaft and electronic equipment |
-
2009
- 2009-09-29 CN CN200910093142A patent/CN101655042A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678362A (en) * | 2012-05-16 | 2012-09-19 | 联合汽车电子有限公司 | System of phase-free sensor for identifying one cylinder compression TDC (Top Dead Center) of three-cylinder engine |
| CN107035561A (en) * | 2015-12-16 | 2017-08-11 | 现代自动车株式会社 | Engine synchronization device and its control method |
| CN107035561B (en) * | 2015-12-16 | 2021-07-13 | 现代自动车株式会社 | Engine synchronization device and control method thereof |
| CN114922731A (en) * | 2022-05-09 | 2022-08-19 | 潍柴动力股份有限公司 | Method and device for detecting signal loss fault of crankshaft/camshaft and electronic equipment |
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Application publication date: 20100224 |