JP3972564B2 - Cylinder determination device for internal combustion engine having three cylinders - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder determination device for an internal combustion engine having three cylinders , and in particular, can shorten the time required for cylinder determination, can prevent erroneous cylinder determination due to fluctuations in engine speed, and requires cylinder determination. It is related with the cylinder determination apparatus of the internal combustion engine which has three cylinders which can improve the reliability of control.
[0002]
[Prior art]
An internal combustion engine mounted on a vehicle or the like generally includes a plurality of cylinders, and it is necessary to determine which cylinder is in order to control the ignition timing, fuel injection timing, and the like of each cylinder. As a cylinder determination device for determining a cylinder of an internal combustion engine having a plurality of cylinders, there are those disclosed in Japanese Patent Application Laid-Open Nos. 11-31147 and 11-31148.
[0003]
Japanese Patent Application Laid-Open No. 11-31147 discloses a multi-cylinder engine having a signal member mounted on a camshaft, a plurality of concave or convex groups formed on the signal member, and a crank angle sensor. In the cylinder determination device, the concave group or the convex group has the same number of groups as the number of cylinders of the engine, and the number of the concave parts or the convex parts is different from each other. The cylinder is determined by detecting a signal based on the group with a crank angle sensor.
[0004]
Japanese Patent Application Laid-Open No. 11-31148 discloses a first signal member and a second signal member mounted on a camshaft, and a crank angle sensor and a cam that are arranged to face the first signal member and the second signal member, respectively. An angle sensor, and the first signal member has the same number of recesses or protrusions as the number of cylinders of the engine, and one of the recesses or protrusions has a different number of recesses or protrusions. And the second signal member includes the same number of valve opening / closing timing recesses or protrusions as the number of cylinders of the engine, and the signal based on the first signal member and the second signal member is The cylinder is determined by detecting the crank angle sensor and the cam angle sensor.
[0005]
[Problems to be solved by the invention]
By the way, what is disclosed by the said Unexamined-Japanese-Patent No. 11-311147 determines the cylinder by detecting the recessed part group or convex part group of one signal member with which the cam shaft was mounted | worn with a crank angle sensor.
[0006]
However, what is disclosed in this publication is that the signal member has a concave group or a convex group so that only one signal period in the signal pattern detected by the crank angle sensor is shorter than the other signals. Are provided.
[0007]
For this reason, what is disclosed in this publication needs to detect a short-cycle signal and a long-cycle signal, and therefore requires a rotation of 270 degrees CA to 995 degrees CA for cylinder determination, and is required for cylinder determination. There is an inconvenience that the time is lengthened, and as a result, there is an inconvenience that the starting time is lengthened.
[0008]
In addition, what is disclosed in this publication uses a crank angle sensor to detect a concave group or a convex group of one signal member mounted on a camshaft and determine a time period to perform cylinder determination. When the fluctuation of the number is large, the time period to be detected fluctuates greatly, thereby causing an inconvenience of erroneous determination of the cylinder and inability to determine, and an inconvenience of lowering the reliability of the control that requires the cylinder determination.
[0009]
Japanese Patent Application Laid-Open No. 11-31148 discloses a cylinder based on a signal based on a first signal member and a second signal member mounted on a camshaft by a crank angle sensor and a cam angle sensor. is doing.
[0010]
However, what is disclosed in this publication is that only the number of convex portions of the convex portion group corresponding to one cylinder among the same number of convex portion groups as the number of cylinders formed in the first signal member is the other. The cylinder is determined by counting the number of convex portions of the convex group corresponding to the cylinder by the crank angle sensor between the signals detected by the cam angle sensor. .
[0011]
For this reason, the one disclosed in this publication has a disadvantage that the time required for the cylinder determination becomes long because the cylinder cannot be determined unless the number of convex portions of two consecutive convex portion groups is counted. As a result, there is an inconvenience that the starting time becomes long.
[0012]
[Means for Solving the Problems]
Accordingly, in order to eliminate the above-described disadvantages, the present invention provides a first signal member on the cam shaft of an internal combustion engine having three cylinders, and the cam angle for each cylinder of the internal combustion engine is provided on the first signal member. Each cylinder cam angle signal generating section for generating each cylinder cam angle signal corresponding to the number of cylinder cam angle signals is provided according to the number of cylinders, and the cam angle for detecting each cylinder cam angle signal generated by each cylinder cam angle signal generating section is provided. A sensor is provided, a second signal member is provided on the crankshaft of the internal combustion engine, and a different number of crank angle signals for each cylinder among the cylinder cam angle signals corresponding to the number of cylinders on the second signal member. Are provided with a plurality of crank angle signal generators, a crank angle sensor for detecting a crank angle signal generated by these crank angle signal generators, and two consecutive cylinders detected by the cam angle sensor. It is characterized in that there is provided a judging means for judging a cylinder by a different number of crank angle signals for each cylinder detected by the crank angle sensor between cam angle signals.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The cylinder determination device for an internal combustion engine having three cylinders according to the present invention can determine a cylinder only by detecting a crank angle signal between two consecutive cylinder cam angle signals. There is no need to detect the crank angle signal twice continuously over the span, and since the cylinder is determined by the number of crank angle signals, it is not affected by fluctuations in the engine speed.
[0014]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention. In FIG. 3, 2 is an internal combustion engine, 4 is a cylinder block, 6 is a cylinder head, 8 is a head cover, and 10 is an oil pan. The internal combustion engine 2 has a plurality of cylinders, that is, a first cylinder # 1 to a third cylinder # 3 in this embodiment, and an air cleaner 12, a throttle body 14, an intake pipe 16, and an intake manifold 18 as an intake system. And an exhaust manifold 20, a catalytic converter 22, an exhaust pipe 24, and a muffler 26 are provided as an exhaust system.
[0015]
The internal combustion engine 2 supports the crankshaft 28 on the cylinder block 4, supports the intake camshaft 30 and the exhaust camshaft 32 on the cylinder head 6, and provides a crank pulley 34 on one end side of the crankshaft 28. An intake cam pulley 36 and an exhaust cam pulley 38 are provided on each end side of the cam shaft 30 and the exhaust cam shaft 32, respectively. The intake cam shaft 30 and the exhaust cam shaft 32 are rotated in synchronization with the rotation of the shaft 28.
[0016]
The internal combustion engine 2 is provided with a cylinder determination device 40. The cylinder determination device 40 is provided with a first signal member 42 on one end side of the intake camshaft 30 by using an intake cam pulley 36 and a cam angle sensor 44 that detects a cam angle signal from the first signal member 42. ing.
[0017]
The first signal member 42 includes first to third cylinder cam angle signals # 1-α to # 3-α corresponding to cam angles of the first to third cylinders # 1 to # 3 of the internal combustion engine 2. There are provided only three first to third cylinder cam angle signal generators 46-1 to 46-3, which are numbers corresponding to the number of cylinders.
[0018]
In this embodiment, as shown in FIG. 4, the first to third cylinder cam angle signal generators 46-1 to 46-3 are located at 75 ° CA before compression top dead center of each cylinder. The third cylinder cam angle 75 degree signal generators 46-1a to 46-3a and the first to third cylinder cam angle 5 degree signal generators 46 serving as ignition standards located at 5 degrees CA before compression top dead center. -1b to 46-3b.
[0019]
The first to third cylinder cam angle signal generators 46-1 to 46-3 are provided with the first to third cylinder cam angle signal generators 46-1a, 46-1b, 46-2a, 46-2b, 46-. The first to third cylinder cam angle signals # 1-α to # 3-α corresponding to the cam angles of the first to third cylinders # 1 to # 3 are respectively represented by 3a and 46-3b. Three-cylinder cam angle signals # 1-75, # 1-5, # 2-75, # 2-5, # 3-75, # 3-5 are generated.
[0020]
Further, the first signal member 42 is provided with one of the first to third cylinder cam angle signal generators 46-1 to 46-3 according to the number of cylinders for determining a specific cylinder. A specific cylinder determination signal generator 48 for generating a signal is provided. In this embodiment, the second cylinder cam angle signal generator 46-2 is in close proximity to the second cylinder cam angle signal generator 46-2b and is specified for determining the second cylinder # 2 as a specific cylinder. A specific cylinder determination signal generator 48 that generates a cylinder determination signal 210 is provided.
[0021]
The cam angle sensor 44 includes first to third cylinder cam angle signals # 1-α to # 3-α generated by the first to third cylinder cam angle signal generators 46-1 to 46-3. 1 to 3rd cylinder cam angle signals # 1-75 / # 1-5, # 2-75 / # 2-5, # 3-75 / # 3-5 are detected.
[0022]
Further, the cylinder determination device 40 is provided with a second signal member 50 using the crank pulley 34 on one end side of the crankshaft 28, and a crank angle sensor 52 that detects a crank angle signal from the second signal member 50. Provided.
[0023]
As shown in FIG. 5, the second signal member 50 includes first to third cylinders # 1 to third cylinders # 1 to third cylinder cam angle signals # 1-α to # 3-α corresponding to the number of cylinders. A plurality of crank angle signal generators 54 for generating different numbers of crank angle signals CL for each of 1 to # 3 are provided. In this embodiment, crank angle signal generators 54a to 54c for generating three crank angle signals CLa to CLc are provided in the second signal member 50 as a plurality of crank angle signal generators 54, and these three crank angle signals are provided. The intervals between the generators 54a to 54c are different in the circumferential direction.
[0024]
The crank angle sensor 52 detects crank angle signals CLa to CLc generated by the three crank angle signal generators 54a to 54c of the crank angle signal generator 54.
[0025]
The cam angle sensor 44 and the crank angle sensor 52 are provided in connection with the determination means 56. The determination means 56 receives the first to third cylinder cam angle signals # 1-α to # 3-α and the crank angle signals CLa to CLc from the cam angle sensor 44 and the crank angle sensor 52, and the cam angle sensor 44 detects them. Between the two consecutive cylinder cam angle signals, that is, between the first and second cylinder cam angle signals # 1-α and # 2-α, and between the second and third cylinder cam angle signals # 2-α and Different numbers for each of the first to third cylinders # 1 to # 3 detected by the crank angle sensor 52 between # 3-α and between the third and first cylinder cam angle signals # 3-α and # 1-α. The cylinder is determined based on the crank angle signals CLa to CLc.
[0026]
Next, the operation of the embodiment will be described.
The internal combustion engine 2 rotates the intake cam shaft 30 and the exhaust cam shaft 32 in synchronization with the rotation of the crankshaft 28, and opens and closes an intake valve and an exhaust valve (not shown).
[0027]
The cylinder determination device 40 of the internal combustion engine 2 generates the first to third cylinder cam angle signals of the first signal member 42 provided on one end side of the intake camshaft 30 by a cam angle sensor 44 as shown in FIG. As first to third cylinder cam angle signals # 1-α to # 3-α corresponding to the cam angles of the first to third cylinders # 1 to # 3 generated by the sections 46-1 to 46-3, First to third cylinder cam angle signals # 1-75 / # 1-5, # 2-75 / # 2-5, # 3-75 / # 3-5 are detected.
[0028]
Further, as shown in FIG. 1, the cylinder determination device 40 includes three crank angle signal generators of a crank angle signal generator 54 of a second signal member 50 provided on one end side of the crankshaft 28 by a crank angle sensor 52. Crank angle signals CLa to CLc generated by 54a to 54c are detected.
[0029]
Signals detected by the cam angle sensor 44 and the crank angle sensor 52 are input to the determination unit 56. The determination means 56 includes first to third cylinder cam angle signals # 1-α to # 3-α of the input signal CH1 from the cam angle sensor 44 and crank angle signals CLa to CLc of the input signal CH2 from the crank angle sensor 52. Between the two consecutive first and second cylinder cam angle signals # 1-α and # 2-α detected by the cam angle sensor 44, and the second and third cylinder cam angle signals # 2-α and #. 3-α and different numbers of cranks for the first to third cylinders # 1 to # 3 detected by the crank angle sensor 52 between the third and first cylinder cam angle signals # 3-α and # 1-α. The cylinder is determined based on the angle signals CLa to CLc.
[0030]
That is, as shown in FIG. 1, the determination means 56 receives an input signal from the crank angle sensor 52 between the second and first cylinder cam angle signals # 2-α and # 1-α of the input signal CH1 from the cam angle sensor 44. When there is one crank angle signal CLa in the signal CH2, it is determined as the first cylinder # 1, and the input signal CH2 is determined between the first and third cylinder cam angle signals # 1-α and # 3-α of the input signal CH1. If there are two crank angle signals CLa and CLb, it is determined that the cylinder is the third cylinder # 3, and the input signal CH2 is set to 3 between the third and second cylinder cam angle signals # 3-α and # 2-α of the input signal CH1. When there are two crank angle signals CLa, CLb, and CLc, the cylinder is determined to be the second cylinder # 2.
[0031]
Thus, the cylinder determination device 40 of the internal combustion engine 2 does not require the rotation of 270 ° CA to 995 ° CA for the cylinder determination as in the conventional case shown by the one-dot chain line in FIG. The cylinder can be determined from 170 degrees CA to 410 degrees CA as shown by, and the crank angle signals CLa to CLc between the two consecutive cylinder cam angle signals # 1-α to # 3-α are detected. The cylinder can be determined only by detecting the crank angle signal twice over the cylinder cam angle signals # 1-α to # 3-α. For example, the crank angle signals CLa and CLb, or CLb And CLc or CLc and CLa need not be detected.
[0032]
For this reason, this cylinder determination apparatus 40 can shorten the time required for cylinder determination, and can shorten the start-up time of the internal combustion engine 2.
[0033]
Further, since the cylinder determination device 40 of the internal combustion engine 2 determines the cylinder based on the number of crank angle signals CLa to CLc, it is not affected by fluctuations in the engine speed.
[0034]
Therefore, the cylinder determination device 40 can improve the reliability of control that requires cylinder determination without causing erroneous determination or inability to determine the cylinder.
[0035]
Further, the cylinder determination device 40 is connected to any one of the first to third cylinder cam angle signal generators 46-1 to 46-3 of the first signal member 42 in this embodiment. A specific cylinder that generates a specific cylinder determination signal 210 for determining the second cylinder # 2 as a specific cylinder in the vicinity of the second cylinder cam angle 5 degree signal generator 46-2b of the cam angle signal generation unit 46-2. A determination signal generator 48 is provided.
[0036]
Therefore, the cylinder determination device 40 uses the specific cylinder determination signal 210 generated by the specific cylinder determination signal generator 48 to detect the cylinder by the cam angle sensor 44 even when the crank angle sensor 52 fails. Can be determined, and the determination accuracy in an emergency can be ensured.
[0037]
The cylinder determination device 40 also includes three crank angle signal generators 54a to 54c as a plurality of crank angle signal generators 54 in the second signal member 50, and the three crank angle signal generators 54a to 54c are provided. By providing different intervals in the circumferential direction, the number of first to third cylinder cam angle signals # 1-α to # 3-α, which is the same as the number of cylinders of the internal combustion engine 2, is different from each other. The crank angle signals CLa to CLc can be detected, and the first signal member 42 provided on the intake camshaft 30 and the second signal member 50 provided on the crankshaft 28 are cylinders without any special shape. Judgment time can be shortened.
[0038]
The present invention is not limited to the above-described embodiments, and various application modifications can be made. For example, in the above-described embodiment, the first signal member 42 includes two signal generators 46-1a and 46-1b as the first to third cylinder cam angle signal generators 46-1 to 46-3, respectively. Although 46-2a and 46-2b and 46-3a and 46-3b are provided, three signal generators may be provided.
[0039]
In the above-described embodiment, the second signal member 50 is provided with crank angle signal generators 54a to 54c that generate different numbers of crank angle signals CLa to CLc for the first to third cylinders # 1 to # 3. However, in order to generate the number of crank angle signals CL corresponding to the numbers of the first to third cylinders # 1 to # 3, that is, in the case of the first cylinder # 1, one crank angle signal CL1, Crank angle signal generators 54-1 to 54-3 are provided so as to generate two crank angle signals CL2 in the case of two cylinders # 2 and three crank angle signals CL3 in the case of third cylinder # 3. You can also. Thus, the cylinder determination can be facilitated by associating the numbers of the first to third cylinders # 1 to # 3 with the crank angle signal CL.
[0040]
Furthermore, in the above-described embodiment, the second signal member 50 has the crank angle signal generator so that different numbers of crank angle signals CLa to CLc are generated in a pulse shape for each of the first to third cylinders # 1 to # 3. 54a to 54c are provided, but a crank angle signal is generated in the second signal member 50 so as to generate crank angle signals CLa to CLc having lengths corresponding to the numbers of the first to third cylinders # 1 to # 3, respectively. Body 54a-54c can be provided. Thus, the cylinder determination can be facilitated by associating the numbers of the first to third cylinders # 1 to # 3 with the length of the crank angle signal CL.
[0041]
【The invention's effect】
As described above, the cylinder determination device for an internal combustion engine having three cylinders according to the present invention can determine a cylinder only by detecting a crank angle signal between two consecutive cylinder cam angle signals. There is no need to detect the crank angle signal twice over the cam signals. For this reason, this cylinder determination apparatus can shorten the time required for cylinder determination and can shorten the starting time. Further, since the cylinder determination device for an internal combustion engine having three cylinders according to the present invention determines the cylinder by the number of crank angle signals, it is not affected by fluctuations in the engine speed. For this reason, this cylinder determination apparatus can improve the reliability of control that requires cylinder determination without causing erroneous determination or inability to determine the cylinder.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating cylinder determination based on a cam angle signal and a crank angle signal of a cylinder determination device according to an embodiment of the present invention.
FIG. 2 is a diagram showing angles required for cylinder determination.
FIG. 3 is a schematic configuration diagram of a cylinder determination device for an internal combustion engine.
FIG. 4 is a front view of a first signal member.
FIG. 5 is a front view of a second signal member.
[Explanation of symbols]
2 Internal combustion engine 28 Crankshaft 30 Intake camshaft 32 Exhaust camshaft 34 Crank pulley 36 Intake cam pulley 38 Exhaust cam pulley 40 Cylinder determination device 42 First signal member 44 Cam angle sensors 46-1 to 46-3 First to third cylinders Cam angle signal generator 48 Specific cylinder determination signal generator 50 Second signal member 52 Crank angle sensor 54 Crank angle signal generator 56 Determination means

Claims (3)

Each cylinder cam is provided with a first signal member on the camshaft of an internal combustion engine having three cylinders, and each cylinder cam angle signal corresponding to the cam angle for each cylinder of the internal combustion engine is generated on the first signal member. As many angle signal generators as the number of cylinders are provided, cam angle sensors for detecting the cylinder cam angle signals generated by the cylinder cam angle signal generators are provided, and a second camshaft sensor is provided on the crankshaft of the internal combustion engine. A signal member is provided, and the second signal member is provided with a plurality of crank angle signal generators for generating different numbers of crank angle signals for each cylinder between the cylinder cam angle signals corresponding to the number of cylinders. A crank angle sensor for detecting a crank angle signal generated by the crank angle signal generator is provided, and the crank angle sensor detects between two consecutive cylinder cam angle signals detected by the cam angle sensor. Cylinder judgment apparatus of an internal combustion engine having three cylinders, characterized in that a determining means for determining cylinder by different number crank angle signal for each cylinder that. 2. The specific signal determination unit according to claim 1, wherein the first signal member is provided with a specific cylinder determination signal generator in any one of the cylinder cam angle signal generators corresponding to the number of cylinders. A cylinder determination device for an internal combustion engine having three cylinders . 2. The cylinder determination device for an internal combustion engine having three cylinders according to claim 1, wherein the second signal member is provided with different intervals between the plurality of crank angle signal generators. 3. .

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