TWI634262B - Phase determination method for multi-cylinder engine - Google Patents

Abstract

A phase determining method for a multi-cylinder engine includes a first operating step, a first determining step, and a second determining step. In this first operational step, only one of the cylinders is operated. In the first determining step, the rotational speed difference is detected or the periodic time difference is calculated. In the second determining step, when the rotational speed difference or the periodic time difference satisfies the set condition, the electronic control unit determines the top dead center phase of the cylinder, thereby completing the phase determination of the cylinder, so that the correct ignition can be obtained. Position to reduce fuel loss and pollution emissions, and is not affected by multi-cylinder negative pressure.

Description

Phase determination method for multi-cylinder engine

The present invention relates to a method for determining a phase, and more particularly to a phase determining method for a multi-cylinder engine.

Referring to FIG. 1 and FIG. 2, each cylinder of a general four-stroke engine is cycled by four strokes of suction, compression, explosion, exhaust, etc., and thereby drives a crankshaft to generate power, and in the compression stroke. Finally, the piston of the cylinder will reach the top dead center, and then the fuel and air mixture will be ignited by injection and ignition of the nozzle and the spark plug to generate power through the subsequent explosion, so that the crankshaft can continue to rotate, however, The crankshaft rotates two times per cycle, so it is not possible to determine when the piston reaches the top dead center simply by the number of turns, that is, it is difficult to determine the phase of the top dead center. In this way, the fuel can be ignited once per revolution of the crankshaft, resulting in waste of fuel and increased pollution. Therefore, there is a method of determining the phase by pressure, which is the characteristic of pressure drop through the suction stroke. The phase is determined, but when the engine has a plurality of cylinders, the intake air between the cylinders interferes with each other, causing interference as shown in FIG. 2, causing the pressure data to be affected and the phase cannot be smoothly determined.

Another way to add a cam sensor is to make the phase correct by the periodic characteristics of the cam. However, the cam sensor is not only costly, but also needs to change the configuration of the engine. Therefore, it is more convenient and cost-effective. Low phase determination

[Problems to be solved by the present invention]

Accordingly, it is an object of the present invention to provide a more convenient and less costly phase determination method.

[Technical means to solve the problem]

According to the invention of claim 1, the phase determining method of the multi-cylinder engine of the present invention, the multi-cylinder engine includes at least one cylinder, a pair of crankshafts that should have a plurality of cylinders, and one for measuring the crankshaft speed a crankshaft position sensor, at least one spark plug respectively igniting the plurality of cylinders, at least one nozzle respectively respectively injecting the plurality of cylinders, and one electrically connected to the crank position sensor and An electronic control unit for controlling the plurality of spark plugs and the plurality of nozzles, the phase determining method includes a first operating step, a first determining step, and a second determining step, in the first operating step, Only one of the cylinders that have not been phase-determined is operated, and every time the crankshaft rotates, the spark plug and the nozzle corresponding to the running cylinder are ignited and injected once, and the remaining cylinders are not ignited and injected. In the first determining step, when the electronic control unit receives the rotational speed signal after the crankshaft position sensor detects the ignition of the cylinder, and the rotational speed signal exceeds a set rotational speed value, the cylinder is started. The phase determination of the body is performed by the crank position sensor detecting a difference in the rotational speed after two ignitions of the two consecutive rotations of the crankshaft. In the second determining step, when the aforementioned rotational speed difference exceeds a set rotational speed difference The electronic control unit determines the top dead center phase of the cylinder to complete the phase determination of the cylinder.

According to the invention of claim 2, in the phase determining method of the multi-cylinder engine of the present invention, the multi-cylinder engine includes at least one cylinder, a pair of crankshafts that should have a plurality of cylinders, and one for measuring the crankshaft speed. a crankshaft position sensor, at least one spark plug respectively igniting the plurality of cylinders, at least one nozzle respectively respectively injecting the plurality of cylinders, and one electrically connected to the crank position sensor and An electronic control unit for controlling the plurality of spark plugs and the plurality of nozzles, the phase determining method includes a first operating step, a first determining step, and a second determining step, in the first operating step, Only one of the cylinders that have not been phase-determined is operated, and every time the crankshaft rotates, the spark plug and the nozzle corresponding to the running cylinder are ignited and injected once, and the remaining cylinders are not ignited and injected. In the first determining step, when the electronic control unit receives the rotational speed signal after the crankshaft position sensor detects the ignition of the cylinder, and the rotational speed signal exceeds a set rotational speed value, the cylinder is started. The phase determination of the body is performed by the crank position sensor detecting two speed signals of two ignitions of the two consecutive rotations of the crankshaft, and the electronic control unit receives the two speed signals to calculate a time difference of the rotation cycle. In the second determining step, when the aforementioned rotation cycle time difference exceeds a set time difference, the electronic control unit determines the top dead center phase of the cylinder, thereby completing the phase determination of the cylinder.

According to the invention of claim 3, in the second determining step, after the cylinder of the cylinder is completed, the cylinder is stopped, and when there is a cylinder that has not been phase-determined, one of the cylinders is selected. Performing the phase determination of the cylinder to ignite and inject the fuel, and performing the first operation step, the first determination step, and the second determination step again until all the cylinders complete the top dead center phase determination cylinder, The phase determining method further includes a second operating step subsequent to the second determining step, wherein in the second operating step, the plurality of cylinders are ignited and injected, and the plurality of spark plugs and the plurality of The nozzle ignites and injects oil once every two revolutions of the crankshaft.

According to the invention of claim 4, in the second determining step, the cylinders of the other cylinders are completed through the angular relationship of the plurality of cylinders with respect to the crankshaft, and the phase determining method further includes a continuation a second operating step after the second determining step, in the second operating step, igniting and injecting the plurality of cylinders, and the plurality of spark plugs and the plurality of nozzles are rotated twice in the crankshaft Ignite and spray once.

According to the invention of claim 5, before the first operation step, an initial operation step is further included, in which the plurality of cylinders are all ignited and injected, and the crankshaft is rotated once. The plurality of spark plugs and the plurality of nozzles ignite and inject the oil once.

According to the invention of claim 6, in the first determining step, the set rotational speed value is 800 rpm.

According to the invention of claim 7, in the second determining step, the set rotational speed difference is 1.2 times.

According to the invention of claim 8, in the second determining step, the phase difference determination of the cylinder is completed when the rotational speed difference of the two consecutive revolutions of the crankshaft needs to exceed the set rotational speed difference three times in succession.

According to the invention of claim 9, in the second determining step, the set time difference is 1.2 times.

According to the invention of claim 10, in the second determining step, the phase difference of the cylinder is completed when the time difference of the rotation cycle of the two consecutive revolutions of the crankshaft needs to exceed the set time difference three times in succession.

[Effect of the present invention]

In the invention of claim 1 or 2, the phase angle of the top dead center can be obtained by the single cylinder cylinder, and the other cylinders can be intervened after the determination is completed, so that the correct ignition position can be obtained. In order to reduce fuel loss and pollution emissions, and not interfere with multi-cylinder negative pressure, thereby increasing design freedom, and eliminating the need for a cam sensor, it can reduce costs and facilitate configuration.

In the invention of claim 3, the plurality of cylinders are subjected to cylinders one by one, thereby achieving the purpose of more accurately determining the cylinders.

In the invention of claim 4, after determining one of the cylinders, the top dead center phase of the remaining cylinders is inferred by the characteristics of the different angles of the cylinders at the top dead center when the engine is designed. Thereby improving the speed of determination.

In the invention of claim 5, the plurality of cylinders are operated at the same time, and then converted into a single cylinder for cylinder determination, which can correspond to different engine operation requirements.

In the invention of claim 6, the plurality of cylinders have a minimum crankshaft rotational speed value as a basis for entering a single cylinder determination phase.

In the invention of claim 7 of the patent application, the top dead center phase of the single cylinder is determined by the electronic control unit determination mechanism.

In the invention of claim 8 of the patent application, the determination accuracy is improved by the limit of the judgment by reaching the judgment standard three times in succession.

In the invention of claim 9, the top dead center phase of the single cylinder is determined by the electronic control unit determination mechanism.

In the invention of claim 10, the determination of the criterion is achieved by the judgment limit by three consecutive times.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

3, FIG. 4 and FIG. 5, a first embodiment of a phase determining method for a multi-cylinder engine 1 of the present invention, the multi-cylinder engine 1 comprising two cylinders 11 and a pair of crankshafts that should be two cylinders 11 12. A crank position sensor 13 for measuring the rotational speed of the crankshaft 12, two spark plugs 14 for respectively igniting the plurality of cylinders 11, and two nozzles 15 for respectively injecting the plurality of cylinders 11 And an electronic control unit 16 electrically connected to the crank position sensor 13 for controlling the two spark plugs 14 and the two nozzles 15. In the first embodiment, the electronic control unit 16 is an ECU (Electronic Control Unit). The phase determining method includes a first operating step 21, a first determining step 22, a second determining step 23, and a second operating step 24.

In the first operation step 21, one of the cylinders 11 is operated, and when the crankshaft 12 makes one revolution, the spark plug 14 and the nozzle 15 corresponding to the cylinder 11 in operation are ignited and injected once, and One cylinder 11 is not ignited and injected. In the first determining step 22, a set rotational speed value is set in advance to the electronic control unit 16, which is 800 rpm in the first embodiment, when the electronic control unit 16 receives the detected position of the crankshaft position sensor 13 When the speed signal of the cylinder 11 is ignited, and the speed signal exceeds the set speed value, the phase determination of the cylinder 11 is started, and the speed signal detected by the crank position sensor 13 is used. The control unit 16 can calculate the difference in rotational speed after two ignitions of the two consecutive revolutions of the crankshaft 12. In the second determination step 23, a set rotation speed difference is set in advance, which is 1.2 times in the first embodiment. Since the effective rotation will cause the rotation speed to rise under the correct compression in the compression stroke, the other strokes will be the rotation speed drop, so that it can be judged that the position is the correct top dead center (or top dead center). When the aforementioned rotational speed difference exceeds the set rotational speed difference, it indicates that the correct top dead center is at this time, and the electronic control unit 16 can determine the top dead center phase of the cylinder 11 based on this, thereby completing the phase determination. In particular, in order to improve the accuracy of the determination, it is usually set to achieve the phase difference determination three times in succession. Next, the cylinder 11 after the completion of the phase determination is stopped, and the first operation step 21, the first determination step 22, and the second determination step 23 are repeated, so that the other cylinder 11 also completes the phase determination.

In the second operation step 24, since the two cylinders 11 have all been determined, the two cylinders 11 are operated, and the two spark plugs 14 and the two nozzles 15 are placed on the crankshaft 12 When two turns, it will ignite and inject oil once, so that the multi-cylinder engine 1 can run under the correct top dead center, and it can save fuel and reduce pollution, because no negative pressure or cam sensing is needed. Therefore, the problem that the plurality of cylinders 11 interfere with each other when inhaling and affect the negative pressure can be avoided, and the cost is reduced and the engine configuration is simple.

It should be particularly noted that the first embodiment is also applicable to two or more cylinders 11. In the first operation step 21, a cylinder 11 that is not phase-determined is operated (ignition and injection). The remaining cylinders 11 are stopped (ignition and injection). After the first determination step 22 and the second determination step 23 are passed, the cylinder 11 having the completion determination is stopped (ignition and injection), and another cylinder 11 not subjected to phase determination is selected and operated ( Ignition and fuel injection), then returning to the first operational step 21, before The cylinder 11 that has not performed the phase determination performs the subsequent flow again. When the top dead center phase determination of all the cylinders 11 is completed, all the cylinders 11 are operated, and the plurality of spark plugs 14 and the plurality of nozzles 15 are operated. The crankshaft 12 is ignited and injected once every two revolutions.

Referring to Figures 3, 6 and 7, in addition, the first embodiment may further comprise an initial operational step 20 prior to the first operational step 21, in which the two cylinders are 11 operates together, and the plurality of spark plugs 14 and the plurality of nozzles 15 are ignited and injected once per revolution of the crankshaft 12. Next, in the first operational step 21, one of the cylinders 11 is stopped, and the other cylinder 11 is continuously operated and the subsequent steps are performed. Of course, this method can also be applied to the case of two or more cylinders 11, and provides another choice of different dynamic characteristics to increase versatility.

Referring to FIG. 3, FIG. 4 and FIG. 8, a second embodiment of the phase determining method of the multi-cylinder engine 1 of the present invention is substantially the same as the first embodiment, except that: In the first determining step 22, when the electronic control unit 16 receives the rotational speed signal of the crankshaft after the crankshaft position sensor 13 detects the ignition of the cylinder 11, and the rotational speed signal exceeds a set rotational speed value, The phase determination of the cylinder 11 is started, and the crankshaft position sensor 13 detects two rotational speed signals of the two ignitions of the two consecutive rotations of the crankshaft 12, and the electronic control unit 16 receives the two rotational speed signals. After that, the time difference of the rotation cycle of the two rotational speed signals is calculated. In the second determining step 23, when the aforementioned rotation cycle time difference exceeds a set time difference, the electronic control unit 16 can determine the top dead center phase of the cylinder 11, thereby completing the cylinder. The phase determination of the body 11 is in this second embodiment, the time difference is 1.2 times. This second embodiment defines a way to determine the top dead center phase in cycle time for selection, improving versatility.

It is to be noted that, in order to improve the accuracy at the time of determination, in the second determination step of the second embodiment, it is generally set that the set time difference (1.2 times) is to be exceeded three times in succession, and the phase determination is completed. Furthermore, the second embodiment can also be applied to more than two cylinders 11 as in the first embodiment, or can be further included in the initial operational step 20 prior to the first operational step 21 (ie, initially starting more) The cylinders 11 are ignited and injected).

Referring to FIG. 3, FIG. 9 and FIG. 10, a third embodiment of the phase determining method of the multi-cylinder engine 1 of the present invention is substantially the same as the first embodiment, except that: In the third embodiment, only one cylinder 11 is phase-determined. Since the engine is designed, the top dead center of each cylinder 11 is arranged at different angles of the crankshaft 12, for example, the crank angle difference of the twin-cylinder engine. For 360 degrees, the crank angle difference of the four-cylinder engine is 180 degrees. Therefore, when the top dead center phase of one of the cylinders 11 is determined in the second determining step, the crankshaft 12 can be transmitted through the crankshaft angle relationship. The angle pushes the top dead center phase of the other cylinders 11, thereby completing the cylinders of all the cylinders 11, and enters the second operational step to operate all the cylinders 11 and the corresponding spark plugs 14 and 15 are The crankshaft 12 is ignited and injected once every two revolutions. The third embodiment provides a method of not requiring a cylinder for each cylinder 11 to be determined one by one. Fast and time saving.

Referring to FIG. 3, FIG. 9, and FIG. 11, a fourth embodiment of the phase determining method of the multi-cylinder engine 1 of the present invention is substantially the same as the third embodiment, except that: In the first determining step and the second determining step, the fourth embodiment is based on the time difference of the rotation period of the crankshaft 12 as the determination basis, and the fast determination effect of the third embodiment can also be achieved. .

In summary, by cutting to the single cylinder 11 and determining by the difference of the rotation speed or the rotation cycle time, the interference of the other cylinders 11 can be avoided and the cam sensor is not needed, which improves the convenience of the determination and reduces the configuration difficulty. Therefore, the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧Multi-cylinder engine

11‧‧‧Cylinder

12‧‧‧ crankshaft

13‧‧‧Crankshaft position sensor

14‧‧‧Mars plug

15‧‧‧ nozzle

16‧‧‧Electronic Control Unit

20‧‧‧ initial operational steps

21‧‧‧First operational steps

22‧‧‧First decision step

23‧‧‧Second decision step

24‧‧‧Second operational steps

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a time-history diagram illustrating the state of the crankshaft sensing signal and pressure as a function of time during operation of the single cylinder engine; 2 is a time-history diagram illustrating the state of the crankshaft sensing signal and pressure as a function of time when the twin-cylinder engine is running; FIG. 3 is a schematic view showing a first embodiment of the phase determining method of the multi-cylinder engine of the present invention; FIG. 5 is a block diagram for further explaining the determination flow of the first embodiment; FIG. 6 is a flowchart for explaining another determination process of the first embodiment. FIG. 7 is a block diagram further illustrating the decision flow of FIG. 6. Figure 8 is a block diagram showing a second embodiment of the phase determining method of the multi-cylinder engine of the present invention; Figure 9 is a flow chart showing a third embodiment of the phase determining method of the multi-cylinder engine of the present invention; It is a block diagram to further explain the determination flow of the third embodiment; and FIG. 11 is a block diagram showing a fourth embodiment of the phase determination method of the multi-cylinder engine of the present invention.

Claims (10)

A multi-cylinder engine phase determining method, the multi-cylinder engine comprising at least one cylinder, a pair of crankshafts that should have a plurality of cylinders, a crankshaft position sensor for measuring the crankshaft speed, and at least one of a plurality of a spark plug that ignites the plurality of cylinders, at least one nozzle that respectively injects the plurality of cylinders, and one that is electrically connected to the crank position sensor and used to control the plurality of spark plugs and the plurality An electronic control unit for nozzles, the phase determining method comprising: a first operating step of operating only one of the cylinders without phase determination, and one revolution of the crankshaft, the spark plug and the nozzle corresponding to the operating cylinder Ignition and fuel injection once, the remaining cylinders are not ignited and injected; a first determining step, when the electronic control unit receives the crankshaft position sensor detects the speed of the crankshaft after the cylinder is ignited And after the speed signal exceeds a set speed value, the phase determination of the cylinder is started, and the crankshaft position sensor detects the speed of the two revolutions of the crankshaft after two ignitions. ; And a second determination step, the rotation speed difference exceeds the aforementioned setting a rotational speed difference, the electronic control unit determines that the phase of the upper dead point of the cylinder, thereby completing the determination of the phase of the cylinder. A multi-cylinder engine phase determining method, the multi-cylinder engine comprising at least one cylinder, a pair of crankshafts that should have a plurality of cylinders, a crankshaft position sensor for measuring the crankshaft speed, and at least one of a plurality of a spark plug that ignites the plurality of cylinders, at least one nozzle that respectively injects the plurality of cylinders, and one that is electrically connected to the crank position sensor and used to control the a Mars plug and an electronic control unit of the plurality of nozzles, wherein the phase determining method comprises: a first operating step of operating only one of the cylinders that have not undergone phase determination, and the cylinder is operated for each revolution of the crankshaft The body's spark plug and nozzle are ignited and injected once, and the remaining cylinders are not ignited and injected; in a first determining step, when the electronic control unit receives the crank position sensor, the cylinder is detected to be ignited. After the speed signal of the rear crankshaft, and the speed signal exceeds a set speed value, the phase determination of the cylinder is started, and the crank position sensor detects the two ignitions of the crankshaft in two consecutive rotations. Two rotational speed signals, the electronic control unit receives the two rotational speed signals, and calculates a rotational cycle time difference between the two rotational speed signals; and a second determining step, when the aforementioned rotational cycle time difference exceeds a set time difference, the electronic The control unit determines the top dead center phase of the cylinder to complete the phase determination of the cylinder. The phase determining method of the multi-cylinder engine according to claim 1 or 2, wherein, in the second determining step, after the cylinder of the cylinder is completed, the cylinder is stopped, and when there is still no phase determination In the cylinder, one of the cylinders not subjected to the phase determination is selected for ignition and fuel injection, and the first operation step, the first determination step and the second determination step are performed again until all the cylinders are completed. a phase-determining method for determining a dead-end phase, the phase determining method further comprising a second operating step subsequent to the second determining step, wherein in the second operating step, the plurality of cylinders are ignited and injected, and the A plurality of spark plugs and the plurality of nozzles ignite and inject once every two revolutions of the crankshaft. The phase determining method of the multi-cylinder engine according to claim 1 or 2, wherein in the second determining step, the cylinders of the other cylinders are completed by the angular relationship of the plurality of cylinders with respect to the crankshaft, The phase determining method further includes a second operating step subsequent to the second determining step, wherein in the second operating step, the plurality of cylinders are ignited and injected, and the plurality of spark plugs and the plurality of The nozzle ignites and injects oil once every two revolutions of the crankshaft. The phase determining method of the multi-cylinder engine according to claim 1 or 2, before the first operating step, further comprising an initial operating step, in which the plurality of cylinders are all ignited and injected, And each time the crankshaft makes one revolution, the plurality of spark plugs and the plurality of nozzles are ignited and injected once. The phase determining method of the multi-cylinder engine according to claim 1 or 2, wherein in the first determining step, the set rotational speed value is 800 rpm. The phase determining method of the multi-cylinder engine according to claim 1, wherein in the second determining step, the set rotational speed difference is 1.2 times. The phase determining method of the multi-cylinder engine according to claim 1, wherein in the second determining step, the phase difference of the cylinder is completed when the rotational speed difference of two consecutive revolutions of the crankshaft needs to exceed the set rotational speed difference three times in succession. . The phase determining method of the multi-cylinder engine according to claim 2, wherein in the second determining step, the set time difference is 1.2 times. The phase determining method of the multi-cylinder engine according to claim 2, wherein in the second determining step, the phase difference of the cylinder is completed when the time difference of the rotation cycle of the two consecutive revolutions exceeds the set time difference three times in succession. .