JP4980572B2 - Engine crank angle assignment method and crank angle assignment device, engine camshaft misassembly detection method and camshaft misassembly detection device, engine crankshaft misassembly detection method and crankshaft misassembly detection device - Google Patents

Description

  The present invention relates to an engine crank angle assigning method and a crank angle assigning device for assigning a crank angle based on a detection signal waveform obtained from a cam angle sensor, a crank angle sensor or the like in synchronization with the rotation of the engine. Engine camshaft misassembly detection method, camshaft misassembly detection device, engine crankshaft misassembly detection method, and crankshaft, which detect engine camshaft and crankshaft misassembly based on waveforms The present invention relates to an erroneous assembly detection device.

  Conventionally, in an engine production process, an evaluation test of a produced engine, so-called receipt operation, is performed in order to ensure shipping quality. An example of an evaluation item of this engine is the valve clearance of the intake valve and the exhaust valve. In this valve clearance evaluation, the engine to be inspected produced is rotated at a constant rotation speed, and the intake valve and the exhaust valve are checked. The clearance is determined based on the opening / closing timing of the valve, and if it is defective, the valve clearance is readjusted.

  Here, in order to determine the opening / closing timing of the valve, for example, a vibration sensor is mounted in the vicinity of each valve, and a valve vibration signal related to opening / closing of the corresponding valve is extracted from the engine vibration signal during engine rotation. It is necessary to assign a crank angle based on a cam angle detection signal or a crank angle detection signal from a cam angle sensor or a crank angle sensor attached to the engine.

  As the crank angle assignment method, for example, the number of pulse signals corresponding to the cylinder number is obtained from the cam angle sensor for each stroke phase difference between the cylinders, and the position signal for each crankshaft unit crank angle is obtained from the crank angle sensor. The position signal is counted by a counter, and the counted value is cleared by a pulse signal from the cam angle sensor. Based on the comparison between the counted value immediately before the clearing and a predetermined threshold, the reference of each cylinder It is known that a crank angle is assigned to a position, a predetermined number of position signals are counted from the reference position, and a crank angle that is a control reference position for ignition control and fuel injection control is assigned (for example, Patent Documents). 1).

  In addition, one cam angle signal is obtained from the cam angle sensor for each rotation of the camshaft, and a crank angle signal for each unit crank angle of the crankshaft is obtained from the crank angle sensor, and the crankshaft is determined based on the cam angle signal generation timing. It is also known that a crank angle for performing ignition control and fuel injection control is assigned from the counted value and unit crank angle by assigning a crank angle at the reference position and counting the crank angle signal from the reference position. (For example, refer to Patent Document 2).

  On the other hand, in an automobile engine, even when an engine block having the same displacement is used, the engine type differs depending on the camshaft to be mounted, for example, a single cam or a twin cam.

  In recent years, as a camshaft, for example, a camshaft having a high-speed cam and a low-speed cam is mounted and switched to a high-speed cam or a low-speed cam depending on the operating state of the engine. A valve that is designed to obtain an optimal valve opening / closing timing, lift amount, and valve opening period is known.

  Including the mounting of a camshaft that employs such a variable valve system, there are various types of engines that use the same engine block.

  The camshaft is driven by a crank sprocket attached to the crankshaft via a timing belt or timing chain, and this crank sprocket can be mounted with different specifications depending on the engine type. ing.

  For this reason, especially when various types of engines that use the same engine block are produced on the same production line, camshafts with different specifications from the specified engine type or crankshafts with different crank sprockets are mistakenly installed. In such an engine production line, it is inspected whether a camshaft or crankshaft with proper specifications is assembled, that is, whether there is an incorrect assembly of the engine. Like to do.

JP-A-11-257147 JP 2004-27974 A

  However, in the conventional crank angle assignment method, as disclosed in Patent Documents 1 and 2, the cam angle detection signal obtained from the cam angle sensor and the crank angle detection signal obtained from the crank angle sensor are various. Since the calculation method of the crank angle is not versatile, there is a concern that mechanical parts such as a signal detection rotor, circuit parts such as crank angle calculation, and software, etc. cannot be shared, resulting in an increase in cost. .

  In addition, conventionally, in receipt operation, it is not possible to inspect for incorrect assembly of the engine. Therefore, after assembly of the camshaft or crankshaft, it is inspected whether a normal specification is assembled by visual inspection. .

  However, the visual inspection is erroneously determined as incorrect assembly even when a product with a normal specification is assembled. There is a possibility that incorrect assembly may be overlooked because it is reattached, or it is misjudged that the product with the correct specification is assembled even if it is misassembled, which may lead to a decrease in production efficiency and quality. The

  Accordingly, a first object of the present invention made in view of the above circumstances is to provide a crank angle allocating method and a crank angle allocating apparatus for an engine that are excellent in versatility and can allocate a crank angle with a simple and inexpensive configuration. There is.

  Furthermore, a second object of the present invention is to detect erroneous camshaft and crankshaft assembly during receipt operation, and to detect a camshaft misassembly and camshaft error in an engine that can improve production efficiency and quality. An assembly detection device, an engine crankshaft erroneous assembly detection method, and a crankshaft erroneous assembly detection device are provided.

The engine crank angle assignment method according to claim 1, which achieves the first object, is characterized in that the camshaft of the camshaft is rotated when an engine having a regular camshaft is rotated at a constant rotational speed. The signal waveform output from the cam angle sensor for detecting the rotation angle is defined as a cam angle reference signal waveform, and the cam angle reference signal waveform in which the actual crank angle is assigned to at least one predetermined cam angle reference signal position in advance The reference time interval of the cam angle reference signal is stored in a database, the engine to be inspected is rotated at the constant rotation speed, and the cam angle detection signal waveform output from the cam angle sensor attached to the engine is received. Then, a time interval between sequential cam angle detection signals is calculated from the cam angle detection signal waveform, and the time interval between the calculated sequential cam angle detection signals and the database are calculated. The cam angle detection signal waveform and the cam angle reference signal waveform are calculated based on the reference time interval of the sequential cam angle reference signals stored in the image, and a calculation value representing the matching is set in advance. And assigning the actual crank angle to the cam angle detection signal position of the cam angle detection signal waveform corresponding to the predetermined cam angle reference signal position when the value is within the range of the upper and lower limit values, The crank angle is assigned by interpolation calculation to the cam angle detection signal position of the cam angle detection signal waveform corresponding to the calculated sequential cam angle detection signal based on the above .

  According to a second aspect of the present invention, in the engine crank angle assignment method according to the first aspect, the reference time intervals of sequential cam angle reference signals having different generation time intervals in the cam angle reference signal waveform are stored in the database. In calculating the time intervals of the sequential cam angle detection signals, sequential cam angle detection signals having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the cam shaft of the engine to be inspected are calculated. In calculating the time interval and matching between the cam angle detection signal waveform and the cam angle reference signal waveform, the time interval of the successive cam angle detection signals in the cam angle detection signal waveform is T (i), and the cam When the reference time interval of sequential cam angle reference signals in the angle reference signal waveform is Tbase (i),

ただし、ｊ＝１〜Ｎ、Ｎ：カムシャフト１回転のカム角基準信号数
を演算することを特徴とする。

However, j = 1 to N, N: The cam angle reference signal number of one rotation of the camshaft is calculated.

The engine crank angle assignment method according to claim 3, which achieves the first object, is characterized in that the engine crankshaft is rotated when the engine having the regular specification crankshaft is rotated at a constant rotational speed. The crank angle reference signal waveform is a signal waveform output from the crank angle sensor for detecting the rotation angle of the crank angle reference signal waveform, and the crank angle reference signal waveform is assigned sequentially to at least one predetermined crank angle reference signal position in advance. The reference time interval of the crank angle reference signal is stored in a database, the engine to be inspected is rotated at the fixed rotation speed, and a crank angle detection signal waveform output from a crank angle sensor attached to the engine is obtained. The time interval between sequential crank angle detection signals is calculated from the crank angle detection signal waveform, and the above calculation is performed. The matching between the crank angle detection signal waveform and the crank angle reference signal waveform is calculated based on the time interval of the sequential crank angle detection signal and the reference time interval of the sequential crank angle reference signal stored in the database. When the calculated value representing the matching is within the range of the upper and lower limit values of the predetermined determination value, the crank angle detection signal position of the crank angle detection signal waveform corresponding to the predetermined crank angle reference signal position is Assign an actual crank angle and assign the crank angle to the crank angle detection signal position of the crank angle detection signal waveform corresponding to the calculated sequential crank angle detection signal based on the assigned actual crank angle by interpolation calculation. It is characterized by.

  According to a fourth aspect of the present invention, in the crank angle assignment method for an engine according to the third aspect, the engine is a four-cycle engine, and sequential crank angles having different generation time intervals in the crank angle reference signal waveform are stored in the database. The reference time interval of the reference signal is stored, and in calculating the time interval of the sequential crank angle detection signal, the generated time interval in the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected And calculating the time interval between sequential crank angle detection signals with different crank angle detection signals, and calculating the matching between the crank angle detection signal waveform and the crank angle reference signal waveform, the time of sequential crank angle detection signals in the crank angle detection signal waveform is calculated. The interval is TC (i), and the crank angle reference signal in the crank angle reference signal waveform is sequential. When the reference time interval is TCbase (i),

ただし、ｊ＝１〜Ｍ、Ｍ：クランクシャフト２回転のクランク角基準信号数
を演算することを特徴とする。

However, j = 1 to M, M: The number of crank angle reference signals for two rotations of the crankshaft is calculated.

  According to a fifth aspect of the present invention, in the engine crank angle assignment method according to any one of the first to fourth aspects, the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. It is characterized by.

7. The engine crank angle allocating device according to claim 6, which achieves the first object, wherein the engine camshaft is rotated when the engine having the regular camshaft is rotated at a constant rotational speed. The cam angle reference signal waveform is a signal waveform output from the cam angle sensor for detecting the rotation angle of the cam, and the cam angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined cam angle reference signal position in advance A database for storing the reference time interval of the cam angle reference signal, and the cam angle detection signal waveform output from the cam angle sensor attached to the engine by rotating the engine to be inspected at the constant rotation speed. Receiving the waveform analysis means for calculating the time interval of the sequential cam angle detection signal from the cam angle detection signal waveform, and the sequential calculation calculated by the waveform analysis means. Waveform matching for calculating matching between the cam angle detection signal waveform and the cam angle reference signal waveform based on the time interval of the cam angle detection signal and the reference time interval of the sequential cam angle reference signals stored in the database The cam angle detection corresponding to the predetermined cam angle reference signal position when the calculation means and the calculated value representing the matching calculated by the waveform matching calculation means are within a predetermined upper and lower limit value range. The cam angle detection signal of the cam angle detection signal waveform corresponding to the sequential cam angle detection signal calculated based on the assigned actual crank angle by assigning the actual crank angle to the cam angle detection signal position of the signal waveform And an interpolation calculation means for assigning a crank angle to the position by linear interpolation.

  According to a seventh aspect of the present invention, in the engine crank angle assignment device according to the sixth aspect, the database stores reference time intervals of successive cam angle reference signals having different generation time intervals in the cam angle reference signal waveform. The waveform analysis means calculates time intervals of sequential cam angle detection signals having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the camshaft of the engine to be inspected, and the waveform The matching calculation means has a time interval of sequential cam angle detection signals in the cam angle detection signal waveform as T (i), and a reference time interval of sequential cam angle reference signals in the cam angle reference signal waveform as Tbase (i). and when,

ただし、ｊ＝１〜Ｎ、Ｎ：カムシャフト１回転のカム角基準信号数
を演算することを特徴とする。

However, j = 1 to N, N: The cam angle reference signal number of one rotation of the camshaft is calculated.

The engine crank angle allocating device according to claim 8, which achieves the first object described above, is characterized in that the engine crankshaft of the engine when the engine having the regular specification crankshaft is rotated at a constant rotational speed is used. The crank angle reference signal waveform is a signal waveform output from the crank angle sensor for detecting the rotation angle of the crank angle reference signal waveform, and the crank angle reference signal waveform is assigned sequentially to at least one predetermined crank angle reference signal position in advance. A database for storing the reference time interval of the crank angle reference signal, and an engine to be inspected are rotated at the constant rotation speed, and a crank angle detection signal waveform output from a crank angle sensor attached to the engine is obtained. A waveform solution for calculating a time interval between sequential crank angle detection signals from the crank angle detection signal waveform. And the crank angle detection signal waveform based on the time intervals of the sequential crank angle detection signals calculated by the waveform analysis means and the reference time intervals of the sequential crank angle reference signals stored in the database. A waveform matching calculating means for calculating matching with the crank angle reference signal waveform; and a calculated value representing the matching calculated by the waveform matching calculating means within a predetermined upper and lower limit value range, The actual crank angle is assigned to the crank angle detection signal position of the crank angle detection signal waveform corresponding to a predetermined crank angle reference signal position, and the calculated sequential crank angle detection signal based on the assigned actual crank angle. by linear interpolation of the crank angle of the crank angle detection signal position of the corresponding the crank angle detection signal waveform And having a interpolation operation means for applying.

  According to a ninth aspect of the present invention, in the engine crank angle assignment device according to the eighth aspect, the engine is a four-cycle engine, and the database includes sequential crank angles having different generation time intervals in the crank angle reference signal waveform. The reference time interval of the reference signal is stored, and the waveform analysis means is a sequential crank angle detection signal having different generation time intervals in the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected. The waveform matching calculation means calculates the time interval of the sequential crank angle detection signal in the crank angle detection signal waveform as TC (i) and the sequential crank angle reference signal in the crank angle reference signal waveform. When the reference time interval is TCbase (i),

ただし、ｊ＝１〜Ｍ、Ｍ：クランクシャフト２回転のクランク角基準信号数
を演算することを特徴とする。

However, j = 1 to M, M: The number of crank angle reference signals for two rotations of the crankshaft is calculated.

  According to a tenth aspect of the present invention, in the engine crank angle allocating device according to any one of the sixth to ninth aspects, the fixed rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. It is characterized by.

  The invention of the engine camshaft erroneous assembly detection method according to claim 11 that achieves the second object is the engine when the engine with the regular camshaft is rotated at a constant rotational speed. A cam angle reference signal in which a cam angle reference signal waveform is used as a signal waveform output from a cam angle sensor for detecting the rotation angle of the cam shaft, and an actual crank angle is assigned in advance to at least one predetermined cam angle reference signal position. Reference time intervals of sequential cam angle reference signals in the waveform are stored in a database, the engine to be inspected is rotated at the above-mentioned constant rotation speed, and cam angle detection output from a cam angle sensor attached to the engine is detected. Receiving a signal waveform, calculating a time interval of sequential cam angle detection signals from the cam angle detection signal waveform, and calculating the time interval of the calculated sequential cam angle detection signals; Based on the reference time intervals of the sequential cam angle reference signals stored in the database, the matching between the cam angle detection signal waveform and the cam angle reference signal waveform is calculated, and a calculation value representing the matching is preset. When it deviates from the range of the upper and lower limit values of the determination value, it is determined that a camshaft of another specification is erroneously assembled.

  A twelfth aspect of the present invention is the camshaft misassembly detection method for an engine according to the eleventh aspect, wherein the reference time intervals of successive cam angle reference signals having different generation time intervals in the cam angle reference signal waveform are stored in the database. In the calculation of the time intervals of the sequential cam angle detection signals, sequential cam angles having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the cam shaft of the engine to be inspected are stored. In the calculation of matching between the cam angle detection signal waveform and the cam angle reference signal waveform, the time interval of the cam angle detection signal in the cam angle detection signal waveform is calculated as T (i). When the reference time interval of sequential cam angle reference signals in the cam angle reference signal waveform is Tbase (i),

ただし、ｊ＝１〜Ｎ、Ｎ：カムシャフト１回転のカム角基準信号数
を演算することを特徴とする。

However, j = 1 to N, N: The cam angle reference signal number of one rotation of the camshaft is calculated.

  A thirteenth aspect of the present invention is the camshaft misassembly detection method for an engine according to the eleventh or twelfth aspect, wherein the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. .

  15. The engine camshaft erroneous assembly detection device according to claim 14, which achieves the second object, wherein the engine having the regular camshaft is rotated at a constant rotational speed. A cam angle reference signal in which a cam angle reference signal waveform is used as a signal waveform output from a cam angle sensor for detecting the rotation angle of the cam shaft, and an actual crank angle is assigned in advance to at least one predetermined cam angle reference signal position. A database that stores reference time intervals of successive cam angle reference signals in the waveform, and a cam angle detection that is output from a cam angle sensor attached to the engine to be inspected by rotating the engine to be inspected at the constant rotation speed. A waveform analysis means for receiving a signal waveform and calculating a time interval between successive cam angle detection signals from the cam angle detection signal waveform; The cam angle detection signal waveform and the cam angle reference signal waveform are calculated based on the time interval of the sequential cam angle detection signal and the reference time interval of the sequential cam angle reference signal stored in the database. When the calculated value representing the matching calculated by the waveform matching calculating means deviates from the range of the upper and lower limit values set in advance, the camshaft of another specification is erroneously assembled. And a determination means for determining.

  According to a fifteenth aspect of the present invention, in the engine camshaft erroneous assembly detection device according to the fourteenth aspect, the database includes reference time intervals of successive cam angle reference signals having different generation time intervals in the cam angle reference signal waveform. The waveform analysis means calculates time intervals of sequential cam angle detection signals having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the cam shaft of the engine to be inspected. The waveform matching calculating means sets T (i) as the time interval between sequential cam angle detection signals in the cam angle detection signal waveform, and Tbase (as the reference time interval between sequential cam angle reference signals in the cam angle reference signal waveform. i)

ただし、ｊ＝１〜Ｎ、Ｎ：カムシャフト１回転のカム角基準信号数
を演算することを特徴とする。

However, j = 1 to N, N: The cam angle reference signal number of one rotation of the camshaft is calculated.

  According to a sixteenth aspect of the present invention, in the engine camshaft erroneous assembly detection device according to the fourteenth or fifteenth aspect, the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. .

  18. The engine crankshaft misassembly detection method according to claim 17, which achieves the second object, wherein the engine having the regular crankshaft is rotated at a constant rotational speed. A crank angle reference signal in which a crank angle reference signal waveform is used as a signal waveform output from a crank angle sensor for detecting the rotation angle of the crankshaft, and an actual crank angle is assigned in advance to at least one predetermined crank angle reference signal position. Reference time intervals of sequential crank angle reference signals in the waveform are stored in a database, the engine to be inspected is rotated at the constant rotation speed, and a crank angle detection output from a crank angle sensor attached to the engine is detected. Receiving the signal waveform, the time interval of the sequential crank angle detection signal is calculated from the crank angle detection signal waveform. Based on the calculated time interval of the sequential crank angle detection signal and the reference time interval of the sequential crank angle reference signal stored in the database, the crank angle detection signal waveform and the crank angle reference signal waveform are A matching is calculated, and it is determined that a crankshaft of another specification is erroneously assembled when a calculated value representing the matching deviates from a predetermined upper and lower limit value range.

  The invention according to claim 18 is the engine crankshaft misassembly detection method according to claim 17, wherein the engine is a four-cycle engine, and the generation time interval in the crank angle reference signal waveform is sequentially changed in the database. The reference time interval of the crank angle reference signal is stored, and in calculating the time interval of the sequential crank angle detection signal, the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected is stored. The time intervals of sequential crank angle detection signals with different generation time intervals are calculated, and in the calculation of matching between the crank angle detection signal waveform and the crank angle reference signal waveform, sequential crank angle detection in the crank angle detection signal waveform is performed. The time interval of the signal is TC (i), and the sequential class in the crank angle reference signal waveform is When the standard time interval of click angle reference signal and TCbase (i),

ただし、ｊ＝１〜Ｍ、Ｍ：クランクシャフト２回転のクランク角基準信号数
を演算することを特徴とする。

However, j = 1 to M, M: The number of crank angle reference signals for two rotations of the crankshaft is calculated.

  According to a nineteenth aspect of the present invention, in the engine crankshaft erroneous assembly detection method according to the seventeenth or eighteenth aspect, the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. .

  21. The engine crankshaft erroneous assembly detection device according to claim 20, which achieves the second object described above, wherein the engine with the regular specification crankshaft is rotated at a constant rotational speed. A crank angle reference signal in which a crank angle reference signal waveform is used as a signal waveform output from a crank angle sensor for detecting the rotation angle of the crankshaft, and an actual crank angle is assigned in advance to at least one predetermined crank angle reference signal position. A database that stores reference time intervals of sequential crank angle reference signals in the waveform, and a crank angle detection that is output from a crank angle sensor attached to the engine by rotating the engine to be inspected at the constant rotation speed. Receiving the signal waveform, the time interval of sequential crank angle detection signals is calculated from the crank angle detection signal waveform. Based on the time interval of the sequential crank angle detection signal calculated by the waveform analysis means and the reference time interval of the sequential crank angle reference signal stored in the database. Waveform matching calculation means for calculating a matching between the signal waveform and the crank angle reference signal waveform, and a calculation value representing the matching calculated by the waveform matching calculation means deviates from a predetermined upper and lower limit range of the determination value And determining means for determining that a crankshaft of another specification is misassembled.

  According to a twenty-first aspect of the present invention, in the engine crankshaft erroneous assembly detection apparatus according to the twentieth aspect, the engine is a four-cycle engine, and the database is sequentially generated at different generation time intervals in the crank angle reference signal waveform. The reference time interval of the crank angle reference signal is stored, and the waveform analysis means stores sequential cranks having different generation time intervals in the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected. The time interval of the angle detection signal is calculated, and the waveform matching calculation means sets TC (i) as the time interval of the sequential crank angle detection signal in the crank angle detection signal waveform, and the sequential crank angle in the crank angle reference signal waveform. When the reference time interval of the reference signal is TCbase (i),

ただし、ｊ＝１〜Ｍ、Ｍ：クランクシャフト２回転のクランク角基準信号数
を演算することを特徴とする。

However, j = 1 to M, M: The number of crank angle reference signals for two rotations of the crankshaft is calculated.

  According to a twenty-second aspect of the present invention, in the engine crankshaft erroneous assembly detection device according to the twentieth or twenty-first aspect, the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. .

According to the invention of claim 1, when the engine with the camshaft of the regular specification is rotated at a constant rotation speed, from the cam angle reference signal waveform obtained from the cam angle sensor attached to the engine, A reference time interval of sequential cam angle reference signals in which an actual crank angle is assigned to a predetermined cam angle reference signal position is stored in advance in a database, and the engine to be inspected has the same rotational speed as that of a regular engine. The time interval of the sequential cam angle detection signal is calculated from the cam angle detection signal waveform obtained from the cam angle sensor attached to the engine by rotating, and the time interval of the sequential cam angle detection signal is stored in the database. The cam angle detection signal waveform and the cam angle reference signal waveform are calculated based on the reference time interval of the sequential cam angle reference signals, and the matching result Zui and assigns the actual crank angle to a cam angle detection signal position of the cam angle detection signal waveform corresponding to a predetermined cam angle reference signal position, sequentially cam angle detection signal calculated on the basis of the actual crank angle assigned the Since the crank angle is assigned by interpolation calculation to the cam angle detection signal position of the corresponding cam angle detection signal waveform , the crank angle can be assigned with a simple and inexpensive configuration with excellent versatility.

  According to the invention of claim 2, the database stores the reference time intervals of the sequential cam angle reference signals having different generation time intervals, and the generation time generated during one rotation of the camshaft for the engine to be inspected. By calculating the time interval between sequential cam angle detection signals with different intervals and calculating the matching between the cam angle detection signal waveform and the cam angle reference signal waveform, the calculation accuracy of the matching can be improved. It is possible to increase the angle assignment accuracy.

According to the invention of claim 3, when an engine with a regular specification crankshaft is rotated at a constant rotational speed, a crank angle reference signal waveform obtained from a crank angle sensor attached to the engine, A reference time interval of sequential crank angle reference signals in which an actual crank angle is assigned to a predetermined crank angle reference signal position is stored in advance in a database, and the engine to be inspected has the same rotational speed as that of a regular engine. The time interval of the sequential crank angle detection signal is calculated from the crank angle detection signal waveform obtained from the crank angle sensor attached to the engine by rotating, and the time interval of the sequential crank angle detection signal is stored in the database. Crank angle detection signal waveform and crank angle reference signal based on the reference time interval of the sequential crank angle reference signal Based on the matching result, an actual crank angle is assigned to the crank angle detection signal position of the crank angle detection signal waveform corresponding to the predetermined crank angle reference signal position, and the assigned actual crank angle is calculated. Since the crank angle is assigned to the crank angle detection signal position of the crank angle detection signal waveform corresponding to the sequential crank angle detection signal calculated based on the interpolation calculation, the crank angle is assigned with a simple and inexpensive configuration with excellent versatility. be able to.

  According to the invention of claim 4, the database stores reference time intervals of sequential crank angle reference signals having different generation time intervals, and for the engine to be inspected, the generation time generated during two rotations of the crankshaft. By calculating the time interval of sequential crank angle detection signals with different intervals and calculating the matching between the crank angle detection signal waveform and the crank angle reference signal waveform, the calculation accuracy of matching can be improved for a 4-cycle engine. As a result, it is possible to increase the accuracy of assignment of the crank angle of the four-cycle engine.

  According to the invention of claim 5, since the engine of the regular specification and the engine to be inspected are rotated at the rotation speed corresponding to the idle rotation speed, the cam angle reference signal waveform, the crank angle reference signal waveform, the cam angle detection signal waveform, It is possible to easily obtain the crank angle detection signal waveform.

  According to the sixth aspect of the present invention, the crank angle can be accurately set with respect to the cam angle detection signal waveform obtained from the cam angle sensor with a simple and inexpensive configuration having a database, waveform analysis means, waveform matching calculation means, and interpolation calculation means. Can be assigned.

  According to the seventh aspect of the present invention, the database stores the reference time intervals of sequential cam angle reference signals having different generation time intervals, and the waveform analysis means performs the rotation of the camshaft during one rotation of the camshaft for the engine to be inspected. Since the time interval of the sequential cam angle detection signals with different generation time intervals is calculated and the matching between the cam angle detection signal waveform and the cam angle reference signal waveform is calculated in the waveform matching calculation means, the calculation accuracy of matching As a result, it is possible to increase the accuracy of crank angle assignment.

  According to the invention of claim 8, the crank angle is accurately determined with respect to the crank angle detection signal waveform obtained from the crank angle sensor with a simple and inexpensive configuration having a database, waveform analysis means, waveform matching calculation means, and interpolation calculation means. Can be assigned.

  According to the invention of claim 9, the database stores the reference time intervals of sequential crank angle reference signals having different generation time intervals, and the waveform analysis means performs the rotation of the crankshaft during two rotations of the engine to be inspected. The time interval between sequential crank angle detection signals that are generated at different generation time intervals is calculated, and the matching between the crank angle detection signal waveform and the crank angle reference signal waveform is calculated in the waveform matching calculation means. Therefore, the calculation accuracy of matching can be increased, and as a result, it is possible to increase the accuracy of assigning crank angles of a four-cycle engine.

  According to the invention of claim 10, since the engine of the regular specification and the engine to be inspected are rotated at the rotation speed corresponding to the idle rotation speed, the cam angle reference signal waveform, the crank angle reference signal waveform, the cam angle detection signal waveform, The crank angle detection signal waveform can be obtained with a simple configuration.

  According to the invention of claim 11, when the engine with the camshaft of the regular specification is rotated at a constant rotation speed, from the cam angle reference signal waveform obtained from the cam angle sensor attached to the engine, A reference time interval of sequential cam angle reference signals in which an actual crank angle is assigned to a predetermined cam angle reference signal position is stored in advance in a database, and the engine to be inspected has the same rotational speed as that of a regular engine. The time interval of the sequential cam angle detection signal is calculated from the cam angle detection signal waveform obtained from the cam angle sensor attached to the engine by rotating, and the time interval of the sequential cam angle detection signal is stored in the database. The cam angle detection signal waveform and the cam angle reference signal waveform are calculated based on the reference time interval of the sequential cam angle reference signals, and the matching is performed. When the value deviates from the range of the upper and lower limits of the preset judgment value, it is judged that a camshaft with a different specification has been misassembled, so camshaft misassembly during receipt operation in the engine production process Can be reliably detected, and production efficiency and quality can be improved.

  According to the twelfth aspect of the present invention, the database stores the reference time intervals of sequential cam angle reference signals having different generation time intervals, and the generation time generated during one rotation of the camshaft for the engine to be inspected. By calculating the time interval between sequential cam angle detection signals with different intervals and calculating the matching between the cam angle detection signal waveform and the cam angle reference signal waveform, the calculation accuracy of the matching can be improved. It becomes possible to improve the detection accuracy of shaft misassembly.

  According to the thirteenth aspect of the invention, since the engine of the regular specification and the engine to be inspected are rotated at the rotation speed corresponding to the idle rotation speed, the cam angle reference signal waveform and the cam angle detection signal waveform can be easily obtained from the cam angle sensor. It can be acquired.

  According to the fourteenth aspect of the present invention, the cam from the cam angle sensor attached to the engine in the receipt operation in the production process of the engine with a simple and inexpensive configuration having the database, the waveform analyzing means, the waveform matching calculating means, and the judging means. Since camshaft misassembly can be detected based on the angle detection signal waveform, production efficiency and quality can be improved.

  According to the invention of claim 15, the database stores the reference time intervals of the sequential cam angle reference signals having different generation time intervals, and the waveform analysis means performs the rotation of the camshaft during one rotation of the camshaft for the engine to be inspected. The time interval between sequential cam angle detection signals with different generation time intervals is calculated, and the matching between the cam angle detection signal waveform and the cam angle reference signal waveform is calculated in the waveform matching calculation means. As a result, it is possible to increase the accuracy of determination of camshaft misassembly by the determination means.

  According to the sixteenth aspect of the invention, since the engine of the regular specification and the engine to be inspected are rotated at the rotation speed corresponding to the idle rotation speed, the cam angle reference signal waveform and the cam angle detection signal waveform can be simply obtained from the cam angle sensor. It becomes possible to obtain by configuration.

  According to the invention of claim 17, when the engine with the regular specification crankshaft is rotated at a constant rotation speed, from a crank angle reference signal waveform obtained from a crank angle sensor attached to the engine, A reference time interval of sequential crank angle reference signals in which an actual crank angle is assigned to a predetermined crank angle reference signal position is stored in advance in a database, and the engine to be inspected has the same rotational speed as that of a regular engine. The time interval of the sequential crank angle detection signal is calculated from the crank angle detection signal waveform obtained from the crank angle sensor attached to the engine by rotating, and the time interval of the sequential crank angle detection signal is stored in the database. The crank angle detection signal waveform and the crank angle reference signal based on the reference time interval of the sequential crank angle reference signal When the matching value with the waveform is calculated and the calculated value of the matching value deviates from the range of the upper and lower limit values set in advance, it is determined that a crankshaft with a different specification has been misassembled. In the receipt operation in the process, erroneous assembly of the crankshaft can be reliably detected, and the production efficiency and quality can be improved.

  According to the invention of claim 18, the database stores reference time intervals of sequential crank angle reference signals having different generation time intervals, and for the engine to be inspected, the generation time generated during two rotations of the crankshaft. By calculating the time interval of sequential crank angle detection signals with different intervals and calculating the matching between the crank angle detection signal waveform and the crank angle reference signal waveform, the calculation accuracy of matching can be improved for a 4-cycle engine. As a result, it becomes possible to improve the accuracy of detection of crankshaft misassembly of a four-cycle engine.

  According to the nineteenth aspect of the invention, since the engine of the normal specification and the engine to be inspected are rotated at the rotation speed corresponding to the idle rotation speed, the crank angle reference signal waveform and the crank angle detection signal waveform can be easily obtained from the crank angle sensor. It can be acquired.

  According to the twentieth aspect of the present invention, the crank from the crank angle sensor attached to the engine in the receipt operation in the production process of the engine has a simple and inexpensive configuration having a database, a waveform analysis unit, a waveform matching calculation unit, and a determination unit. Since it is possible to detect erroneous assembly of the crankshaft based on the angle detection signal waveform, it is possible to improve production efficiency and quality.

  According to the invention of claim 21, the database stores the reference time intervals of the sequential crank angle reference signals having different generation time intervals, and the waveform analysis means performs the rotation of the crankshaft during two rotations of the engine to be inspected. Since the time intervals of sequential crank angle detection signals with different generation time intervals are calculated and the matching between the crank angle detection signal waveform and the crank angle reference signal waveform is calculated in the waveform matching calculation means, The matching calculation accuracy can be increased, and as a result, the determination accuracy of the crankshaft misassembly of the 4-cycle engine by the determination means can be increased.

  According to the invention of claim 22, since the engine of the regular specification and the engine to be inspected are rotated at the rotation speed corresponding to the idle rotation speed, the crank angle reference signal waveform and the crank angle detection signal waveform can be simply obtained from the crank angle sensor. It becomes possible to obtain by configuration.

  Hereinafter, an engine crank angle assignment method and crank angle assignment device, an engine camshaft misassembly detection method and camshaft misassembly detection device, and an engine crankshaft misassembly detection method and crankshaft error according to the present invention will be described below. An embodiment of the assembly detection apparatus will be described with reference to the drawings.

(First embodiment)
FIGS. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a functional block diagram showing a schematic configuration of a crank angle assignment device having a camshaft misassembly detection function, FIG. (B) is a diagram showing cam angle detection signal waveforms obtained from different types of engines, FIG. 3 is a flowchart showing a database creation procedure, FIG. 4 is a diagram showing a part of cam angle reference signal waveforms, and FIG. FIG. 6 is a diagram showing a flag attached to the cam angle detection signal waveform, and FIG. 7 is a diagram showing a part of the cam angle detection signal waveform.

  The crank angle assignment device 10 of the present embodiment is used at the time of receipt operation in the engine production line, and assigns a crank angle of the engine 1 of four cycles. As shown in FIG. A waveform analysis unit 3, a database 4, a waveform matching calculation unit 5, a determination unit 6, an interpolation calculation unit 7 and a display unit 8 are provided.

  The cam angle sensor 2 is attached to the engine 1 and detects the rotation angle of the cam shaft of the engine 1. The cam angle detection signal waveform output from the cam angle sensor 2 in synchronization with the rotation of the engine 1 is a waveform. Input to the analysis means 3.

  Here, the receipt operation of the engine 1 means that the engine 1 to be inspected is subjected to motoring (rotating the engine by the motor) or the operation of the engine 1 to a constant engine speed, preferably an engine idle speed (for example, , 700 rpm).

  The cam angle detection signal waveform output from the cam angle sensor 2 is a plurality of pulses in which the cam angle detection signal waveform during one rotation of the camshaft when the engine is operated at a constant engine speed differs in the generation time interval. The generation timing and pulse width of the cam angle detection signal differ depending on the specifications of the camshaft assembled to the engine 1, that is, the engine model, as shown in FIGS. 2 (a) and 2 (b), for example. To do.

  The waveform analysis unit 3 calculates time intervals of sequential cam angle detection signals output from the cam angle sensor 2 and supplies the calculated time intervals to the waveform matching calculation unit 5.

On the other hand, the database 4 can be obtained from the same cam angle sensor when a regular engine with a regular camshaft assembled in advance is rotated at the same engine speed (for example, 700 rpm) as described above. The cam angle detection signal waveform is used as a cam angle reference signal waveform, and the time interval of sequential cam angle reference signals calculated by the waveform analysis means 3 for the cam angle reference signal waveform is stored as a reference time interval.

  Further, the cam angle reference signal waveform obtained during one rotation of the regular specification camshaft includes an actual crank previously obtained based on data such as experiments and cam profiles at at least one predetermined cam angle reference signal position. An angle (° CA) is assigned, and the predetermined cam angle reference signal position is associated with the assigned actual crank angle and stored in the database 4 in advance.

  The waveform matching calculation means 5 uses the time intervals of the sequential cam angle detection signals calculated by the waveform analysis means 3 and the reference time intervals of the sequential cam angle reference signals stored in the database 4 to calculate the cam angle. The similarity between the detection signal waveform and the cam angle reference signal waveform is calculated, and the calculation result is supplied to the determination means 6.

  Based on the calculation result from the waveform matching calculation means 5, the determination means 6 determines whether or not the camshaft assembled to the engine 1 is of a regular specification, and uses the determination result as an interpolation calculation means. 7 and display means 8.

In the interpolation calculation means 7, the cam of the cam angle detection signal waveform corresponding to a predetermined cam angle reference signal position stored in the database 4 when the determination means 6 determines that the camshaft is of a normal specification. Similarly, the actual crank angle stored in the database 4 is assigned to the angle detection signal position, and the cam angle of the cam angle detection signal waveform corresponding to the sequential cam angle detection signal calculated based on the assigned actual crank angle. A crank angle is assigned to the detection signal position by linear interpolation, and a crank angle signal from 0 ° CA to 720 ° CA is output for each rotation of the camshaft. This crank angle signal is used for evaluating the valve clearance of the intake valve and the exhaust valve.

  The display unit 8 displays, for example, “OK” when the determination unit 6 determines that the camshaft is of the normal specification, and “NG” when it is determined that the camshaft is not of the normal specification. Is displayed.

  Hereinafter, the operation of the engine crank angle assignment apparatus 10 according to the present embodiment will be described in more detail.

  First, the calculation of sequential reference time intervals stored in the database 4 and the allocation of actual crank angles, that is, the procedure for creating the database 4 will be described with reference to the flowchart shown in FIG.

  In creating this database 4, a regular engine 1 with a regular camshaft is rotated at a constant rotational speed by motoring. At this time, the cam angle detection signal waveform obtained from the cam angle sensor 2 is used as a cam angle reference signal waveform, the time interval between the successive cam angle reference signals is calculated by the waveform analysis means 3, and the calculated time interval is used as the reference time. The actual crank angle is assigned to at least one predetermined cam angle reference signal position and assigned to the predetermined cam angle reference signal position with respect to the cam angle reference signal waveform obtained from the cam angle sensor 2. The actual crank angle is stored correspondingly.

  For this reason, first, the number of cam angle reference signals (N; the number of pulses) obtained from the cam angle sensor 2 during one rotation of the camshaft is set as the number of flags (nbase) for one rotation (step S1). Then, the normal engine 1 is rotated and the cam angle reference signal waveform output from the cam angle sensor 2 is read (step S2).

  Next, a sequential cam angle reference signal edge (rising edge in the present embodiment) is detected and a flag is set (step S3). Thereafter, as shown in FIG. 4 as a part of the cam angle reference signal waveform, Flag names Fbase (i) (i = 1 to nbase) are assigned to all flags, and the time of each flag is defined as tbase (i) and the crank angle of each flag is defined as cbase (i) (step S4).

  Next, a time interval Tbase (i) of sequential flags is calculated according to the following equation (1) using the time tbase (i) of each flag (step S5), and the time interval Tbase of the calculated sequential flags is calculated. (I) is stored in the database 4 as sequential reference time intervals.

  Further, among the flag names assigned in step S4, an actual crank angle is assigned to the crank angle cbase (i) of at least one predetermined flag name Fbase (i) (step S6), and the predetermined flag name Fbase (i ) (Cam angle reference signal position) and the assigned actual crank angle are stored in the database 4 in association with each other.

  The actual crank angle may be assigned to the crank angle cbase (i) of any one flag name Fbase (i), or the crank angle cbase (of any plural or all flag names Fbase (i) may be assigned. Each may be assigned to i).

  Next, regarding the crank angle assignment operation for the actual engine 1 performed using the actual crank angle with respect to the sequential reference time interval Tbase (i) and the predetermined crank angle cbase (i) stored in the database 4, This will be described with reference to the flowchart shown in FIG.

  First, the waveform analysis means 3 calculates time intervals of sequential cam angle detection signals in the same manner as the above-described sequential reference time interval calculation operation. Therefore, the cam angle detection signal waveform obtained from the cam angle sensor 2 is read in synchronism with the rotation of the engine 1 (step S11), and the edge of each cam angle detection signal (in this embodiment, the cam angle reference signal). Similarly, a rising edge) is detected, and a flag is set for sequential edges (step S12).

  Thereafter, as shown in the cam angle detection signal waveform in FIG. 6, flag names F (i) (i = 1 to n, n: the number of flags of the cam angle detection signal) are assigned to all the flags, and FIG. As shown in a part of the detection signal waveform, the time of each flag is defined as t (i), and the crank angle of each flag is defined as c (i) (step S13).

  Next, sequential time intervals T (i) of the flags are calculated according to the following equation (2) using the time t (i) of each flag (step S14).

  After calculating the sequential time intervals T (i) as described above, the waveform matching calculation means 5 then calculates the calculated sequential time intervals T (i) and the sequential stored in the database 4. The reference time interval Tbase (i) is used to calculate the matching between the cam angle detection signal waveform and the cam angle reference signal waveform according to the following equation (3), and the index f indicating the similarity that is the calculated value: (I) is calculated (step S15). In Equation (3), T (i) and Tbase (i) are T (1) and Tbase (j) in order to remove the influence of the difference between the engine speed at the time of creating the database and the actual engine speed. ) To normalize each.

ただし、ｊ＝１〜Ｎ、Ｎ：カムシャフト１回転のカム角基準信号数

Where j = 1 to N, N: number of cam angle reference signals for one camshaft rotation

  As shown in the above equation (3), j is incremented by 1 and the difference between T (i) and Tbase (i + j) is accumulated up to the number of pulses N per camshaft rotation to calculate each f (j) Then, when a regular camshaft is assembled to the engine 1, the cam angle detection signal waveform and the cam angle reference signal waveform substantially coincide with each other at a certain value m where j = 1 to N. When f (m) is substantially zero and a camshaft other than the normal specification is mistakenly assembled, the cam angle detection signal waveform and the cam angle reference signal waveform can be obtained with any value of j = 1 to N. Are not matched, the index f (j) never becomes substantially zero.

  When the waveform matching calculation means 5 calculates the index f (j), the determination means 6 compares the index f (j) as the calculation value representing the matching with preset upper and lower limit values, and the upper and lower limit values. Is detected (step S16), and when the index f (j) is within the upper and lower limits of a predetermined determination value (in the case of YES), the engine is detected. 1 is determined to be a normal specification (step S17), and when the index f (j) deviates from the upper and lower limits of a predetermined determination value (in the case of NO), the engine 1 It is determined that the camshaft that is assembled to the wrong specification, that is, the camshaft of another specification is erroneously assembled (step S18). ”And incorrect specifications Is displayed on the display means 8, for example, "NG" in the case of mis-mounting).

If it is determined in step S17 that the camshaft assembled to the engine 1 is a normal specification, then the cam when the index f (j) is within the range of the upper and lower limit values in the interpolation calculation means 7 will be described. Based on the relationship between the angle reference signal waveform flag Fbase (i) and the cam angle detection signal waveform flag F (i), the cam angle reference signal waveform crank angle cbase (i) stored in the database 4 The actual crank angle assigned to the crank angle cbase (i) is assigned to the crank angle c (i) of the corresponding cam angle detection signal waveform (step S19), and the sequential calculation calculated based on the assigned actual crank angle. and assignment of the cam angle detection signal position of the cam angle detection signal waveform corresponding to the cam angle detection signal of the crank angle by linear interpolation, 0 ° for each rotation of the camshaft Outputting a crank angle signal to A~720 ° CA (step S20).

  After the actual crank angle is first assigned to the predetermined crank angle c (i) of the cam angle detection signal waveform, the same position of the subsequent rotation based on the information on the number of pulses (N) of one rotation of the camshaft. The same actual crank angle is automatically assigned to these pulses, and the entire crank angle is similarly obtained by linear interpolation.

  FIG. 6 shows that an actual crank angle of 50 ° CA stored in the database 4 is assigned to the crank angle c2 of the flag F2 with respect to the cam angle detection signal waveform of 9 pulses (N = 9) per camshaft rotation. Similarly, the actual crank angle of 50 ° CA is assigned to the crank angle c10 of the next flag F10 after the camshaft of the ninth pulse from the flag F2 has made one rotation.

  Therefore, in this case, the crank angle of 720 ° CA from the crank angle 50 ° CA to 720 ° CA (= 0 ° CA) to the next 50 ° CA in the elapsed time from the flag F2 to the flag F10. Is linearly interpolated. When the actual crank angle is assigned to each of a plurality of (including all) flags during one rotation of the camshaft, linear interpolation may be performed between adjacent actual crank angles.

  Thus, according to the present embodiment, a plurality of pulsed cam angle detection signals having different generation time intervals are generated from one cam angle sensor 2 as cam angle detection signal waveforms during one sequential rotation of the camshaft. A cam angle detection signal waveform including a cam angle detection signal waveform and a waveform matching (similarity) between the cam angle detection signal waveform and a cam angle reference signal waveform in which an actual crank angle is assigned in advance to at least one predetermined cam angle reference signal position. When there is a waveform similarity as a result of the calculation, it is determined that the camshaft assembled to the engine 1 is of a regular specification, and linear interpolation is performed based on the assigned actual crank angle. Therefore, it is possible to assign the crank angle with a simple and inexpensive configuration.

  If there is no waveform similarity, it is determined that the camshaft assembled to the engine 1 is not a regular specification and that another camshaft is incorrectly assembled, and the determination result is displayed. Since the information is displayed on the means 8, for example, in the engine production process, it is possible to automatically and accurately detect the camshaft misassembly, thereby improving the production efficiency and quality of the engine.

  In addition, in the calculation of the waveform similarity, the sum of the differences between the time intervals of sequential cam angle detection signals in the cam angle detection signal waveform and the reference time intervals of sequential cam angle reference signals in the cam angle reference signal waveform is Since the cam angle reference signal number (number of pulses N) for one camshaft rotation is determined while shifting the reference time interval of the cam angle reference signal by one pulse, does the cam angle detection signal waveform match the cam angle reference signal waveform? It is possible to more accurately detect whether or not a regular camshaft is assembled to the engine 1. Therefore, it is possible to respond quickly when a wrong assembly is detected, and in particular, in the engine production process, it is no longer necessary to judge a regular specification camshaft as a wrong assembly and reassemble it. As well as production quality.

  Moreover, since the waveform analysis means 3, the database 4, the waveform matching calculation means 5, the determination means 6, the interpolation calculation means 7, and the display means 8 can use, for example, a personal computer (personal computer), the crank angle assignment device 10 as a whole. Can be realized easily and inexpensively.

(Second Embodiment)
FIG. 8 is a functional block diagram showing a schematic configuration of a crank angle assignment device having a crankshaft misassembly detection function in the second embodiment of the present invention.

  As in the first embodiment, the crank angle assignment device 20 of the present embodiment is used at the time of receipt operation in the engine production line, and assigns the crank angle of the engine 1 for four cycles. A waveform analysis unit 13, a database 14, a waveform matching calculation unit 15, a determination unit 16, an interpolation calculation unit 17, and a display unit 18 are included.

  The crank angle sensor 12 is attached to the engine 1 and detects the rotation angle of the crankshaft. The crank angle detection signal waveform output from the crank angle sensor 12 in synchronization with the rotation of the engine 1 is waveform analysis means. 13 is supplied.

  Here, the crank angle detection signal waveform output from the crank angle sensor 12 includes a plurality of pulsed crank angle detection signals in which the crank angle detection signal waveform during two rotations of the crankshaft has different generation time intervals. The generation timing and pulse width differ depending on the specifications of the crank sprocket attached to the crankshaft, that is, the engine type.

  Therefore, in the present embodiment, as in the first embodiment, the engine 1 to be inspected corresponds to a constant engine speed, preferably an engine idle speed, by motoring or operation of the engine 1. The waveform analysis means 13 calculates a sequential time interval TC (i) of the crank angle detection signal output from the crank angle sensor 12, and the calculated time interval TC (i) is a waveform. This is supplied to the matching calculation means 15.

  On the other hand, in the database 14, as in the first embodiment, when the regular engine 1 with the regular crank sprocket assembled in advance is rotated at the same engine speed as described above, The sequential time intervals of the crank angle reference signal obtained from the angle sensor 12 are calculated by the waveform analysis means 13, and the calculated time interval is stored as the reference time interval TCbase (i), and at least one predetermined predetermined interval is stored. An actual crank angle obtained by experiments or the like is assigned to the crank angle reference signal position cbase (i), and the predetermined crank angle reference signal position cbase (i) and the assigned actual crank angle are stored in correspondence with each other. .

  In this way, in the waveform matching calculation means 15, the time intervals TC (i) of the sequential crank angle detection signals calculated by the waveform analysis means 13 and the sequential reference time intervals TCbase (i) stored in the database 14. ) Is used to calculate the matching between the crank angle detection signal waveform and the crank angle reference signal waveform according to the following equation (4), and an index fC (i) indicating the similarity, which is the calculated value, is calculated. In equation (4), TC (i) and TCbase (i) are TC (1) and TCbase (j) in order to eliminate the influence of the difference between the engine speed at the time of database creation and the actual engine speed. ) To normalize each.

ただし、ｊ＝１〜Ｍ、Ｍ：クランクシャフト２回転のクランク角基準信号数

Where j = 1 to M, M: number of crank angle reference signals for two rotations of the crankshaft

  Thereafter, based on the calculation result in the waveform matching calculation unit 15, the determination unit 16 compares the index fC (j) as the calculation value representing the matching with the upper limit value and the lower limit value of the predetermined determination value. When fC (j) is within the range of the upper and lower limit values set in advance, it is determined that the regular crankshaft is assembled to the engine 1, and “OK” is displayed on the display means 18, for example. When the index fC (j) deviates from the range of the upper and lower limit values set in advance, a crankshaft to which a crank sprocket with an incorrect specification is attached is assembled. For example, “NG” is displayed on the display unit 18 because it is determined that it is misassembled.

  Further, when the determination unit 16 determines that the index fC (j) is within the upper and lower limit values of the predetermined determination value and the engine 1 is assembled with a regular crankshaft, the interpolation calculation unit 17 As in the first embodiment, the data is stored in the database 14 based on the relationship between the crank angle reference signal waveform and the crank angle detection signal waveform when the index fC (j) is within the range of the upper and lower limit values. The actual crank angle assigned to the crank angle cbase (i) is assigned to the crank angle detection signal waveform position corresponding to the crank angle cbase (i) of the assigned crank angle reference signal waveform, and the assigned actual crank angle is assigned. Based on this, the entire crank angle is assigned by linear interpolation, and a crank angle signal from 0 ° CA to 720 ° CA is output every two rotations of the crankshaft.

Thereafter, in the same manner as in the first embodiment, the same actual crank angle is automatically assigned to the pulse at the same position based on the information on the number of pulses (M) of two rotations of the crankshaft. The crank angle assigned to the crank angle detection signal position of the crank angle detection signal waveform corresponding to the sequential crank angle detection signal calculated as described above is obtained by linear interpolation.

  Thus, according to the present embodiment, a plurality of pulsed crank angle detection signals having different generation time intervals are generated from one crank angle sensor 12 as a crank angle detection signal waveform during two sequential rotations of the crankshaft. And calculate the waveform similarity between the crank angle detection signal waveform and a crank angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined crank angle reference signal position in advance. As a result of the calculation, if there is a waveform similarity, it is determined that the crankshaft assembled to the engine 1 is of a normal specification, and the crank angle is determined by linear interpolation based on the assigned actual crank angle. Therefore, it is possible to assign the crank angle with a simple and inexpensive configuration with excellent versatility.

  Also, if there is no waveform similarity, it is determined that the crankshaft assembled to the engine 1 is not a regular specification and that a different specification crankshaft is incorrectly assembled, and the determination result is displayed. Since the information is displayed on the means 18, for example, in the engine production process, it is possible to automatically and accurately detect the wrong assembly of the crankshaft, and to improve the production efficiency and quality of the engine.

  In addition, in the calculation of the waveform similarity, the sum of the differences between the time intervals of the sequential crank angle detection signals in the crank angle detection signal waveform and the reference time intervals of the sequential crank angle reference signals in the crank angle reference signal waveform, Since the number of crank angle reference signals (number of pulses M) for two rotations of the crankshaft is obtained while shifting the reference time interval of the crank angle reference signal by one pulse, does the crank angle detection signal waveform match the crank angle reference signal waveform? It is possible to more accurately detect whether or not the engine 1 is equipped with a regular crankshaft. Therefore, when a wrong assembly is detected, it can be dealt with quickly, and in particular, in the engine production process, the regular crankshaft is not judged as a wrong assembly and reassembled. As well as production quality.

  Moreover, since the waveform analysis means 13, the database 14, the waveform matching calculation means 15, the determination means 16, the interpolation calculation means 17, and the display means 18 can use a personal computer (personal computer), for example, the crank angle allocation apparatus 20 whole. Can be realized easily and inexpensively.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the first embodiment, the waveform matching between the cam angle detection signal waveform and the cam angle reference signal waveform is not limited to the number of cam angle reference signals for one rotation of the camshaft, and any arbitrary number of less than one rotation or one rotation or more. You may calculate in a cam angle range. The same applies to the waveform matching calculation between the crank angle detection signal waveform and the crank angle reference signal waveform in the second embodiment.

  In the first embodiment, when calculating the waveform matching between the cam angle detection signal waveform and the cam angle reference signal waveform, the rising edges of sequential pulses in each waveform are detected, and the time interval is obtained. Detect falling edges and calculate the time interval of sequential pulses to calculate waveform matching, or calculate the pulse width of sequential pulses in the cam angle detection signal waveform and cam angle reference signal waveform, and do the same Waveform matching can also be calculated. Similarly, also in the second embodiment, the falling edge of sequential pulses in the crank angle detection signal waveform and the crank angle reference signal waveform is detected to calculate a time interval to calculate waveform matching, or the crank angle It is also possible to obtain the pulse widths of sequential pulses in the signal waveform and the crank angle reference signal waveform and calculate waveform matching in the same manner.

  Furthermore, the present invention is not limited to a four-cycle engine, and can also be applied to crank angle assignment and camshaft or crankshaft misassembly detection of a two-cycle engine.

It is a functional block diagram which shows schematic structure of the crank angle allocation apparatus which has a camshaft misassembly detection function which concerns on 1st Embodiment of this invention. It is a figure which shows the cam angle detection signal waveform obtained from an engine of a different type. It is a flowchart which shows the preparation procedure of the database shown in FIG. It is a figure which shows a part of cam angle reference signal waveform. It is a flowchart which shows the allocation operation | movement of the crank angle by 1st Embodiment. It is a figure which shows the flag attached to a cam angle detection signal waveform. It is a figure which shows a part of cam angle detection signal waveform. It is a functional block diagram which shows schematic structure of the crank angle allocation apparatus which has a crankshaft incorrect assembly | attachment detection function which concerns on 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Cam angle sensor 3, 13 Waveform analysis means 4, 14 Database 5, 15 Waveform matching calculation means 6, 16 Judgment means 7, 17 Interpolation calculation means 8, 18 Display means 10, 20 Crank angle assignment device 12 Crank angle sensor

Claims (22)

A cam angle reference signal waveform is a signal waveform output from a cam angle sensor for detecting the rotation angle of the cam shaft when an engine with a regular cam shaft is rotated at a constant rotation speed. A reference time interval of sequential cam angle reference signals in a cam angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined cam angle reference signal position in advance is stored in a database;
The engine to be inspected is rotated at the constant rotational speed, the cam angle detection signal waveform output from the cam angle sensor attached to the engine is received, and the cam angle detection signal is sequentially generated from the cam angle detection signal waveform. Calculate the time interval of
Based on the calculated time interval of the sequential cam angle detection signal and the reference time interval of the sequential cam angle reference signal stored in the database, the cam angle detection signal waveform and the cam angle reference signal waveform are Calculate the matching,
When the calculated value representing the matching is within the range of the upper and lower limit values of the determination value set in advance, the actual crank is positioned at the cam angle detection signal position of the cam angle detection signal waveform corresponding to the predetermined cam angle reference signal position. An angle is assigned, and a crank angle is assigned by interpolation calculation to a cam angle detection signal position of the cam angle detection signal waveform corresponding to the calculated sequential cam angle detection signal based on the assigned actual crank angle. The engine crank angle assignment method. In the database, the reference time intervals of sequential cam angle reference signals with different generation time intervals in the cam angle reference signal waveform are stored,
In the calculation of the time intervals of the sequential cam angle detection signals, the time of the sequential cam angle detection signals having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the cam shaft of the engine to be inspected. Calculate the interval,
In the calculation of the matching between the cam angle detection signal waveform and the cam angle reference signal waveform, T (i) is used as the time interval of sequential cam angle detection signals in the cam angle detection signal waveform, and the cam angle reference signal waveform is sequentially set. When the reference time interval of the cam angle reference signal is Tbase (i),

2. The engine crank angle assignment method according to claim 1, wherein j = 1 to N, N: the cam angle reference signal number of one rotation of the camshaft is calculated. The crank angle reference signal waveform is the signal waveform output from the crank angle sensor that detects the rotation angle of the engine crankshaft when the engine with the regular crankshaft is rotated at a constant speed. Storing a reference time interval of sequential crank angle reference signals in a crank angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined crank angle reference signal position in advance in a database;
The engine to be inspected is rotated at the constant rotation speed, the crank angle detection signal waveform output from the crank angle sensor attached to the engine is received, and the crank angle detection signal is sequentially generated from the crank angle detection signal waveform. Calculate the time interval of
Based on the calculated time interval of the sequential crank angle detection signal and the reference time interval of the sequential crank angle reference signal stored in the database, the crank angle detection signal waveform and the crank angle reference signal waveform are Calculate the matching,
When the calculated value representing the matching is within the range of the upper and lower limit values of the determination value set in advance, the actual crank is at the crank angle detection signal position of the crank angle detection signal waveform corresponding to the predetermined crank angle reference signal position. An angle is assigned, and a crank angle is assigned by interpolation calculation to a crank angle detection signal position of the crank angle detection signal waveform corresponding to the calculated sequential crank angle detection signal based on the assigned actual crank angle. The engine crank angle assignment method. The engine is a 4-cycle engine,
In the database, the reference time intervals of sequential crank angle reference signals having different generation time intervals in the crank angle reference signal waveform are stored,
In the calculation of the time interval of the sequential crank angle detection signal, the time of the sequential crank angle detection signal having different generation time intervals in the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected. Calculate the interval,
In the calculation of matching between the crank angle detection signal waveform and the crank angle reference signal waveform, the time interval between sequential crank angle detection signals in the crank angle detection signal waveform is TC (i), and the sequential crank angle reference signal waveform is sequentially set. When the reference time interval of the crank angle reference signal is TCbase (i),

4. The engine crank angle assignment method according to claim 3, wherein j = 1 to M and M: a crank angle reference signal number for two rotations of the crankshaft is calculated.   The engine crank angle allocating method according to any one of claims 1 to 4, wherein the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. The cam angle reference signal waveform is the signal waveform output from the cam angle sensor to detect the rotation angle of the cam shaft of the engine when the engine with the regular specification cam shaft is rotated at a constant speed. A database that stores reference time intervals of sequential cam angle reference signals in a cam angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined cam angle reference signal position in advance;
The engine to be inspected is rotated at the constant rotational speed, the cam angle detection signal waveform output from the cam angle sensor attached to the engine is received, and the cam angle detection signal is sequentially generated from the cam angle detection signal waveform. Waveform analysis means for calculating the time interval of,
The cam angle detection signal waveform and the cam angle reference based on the time interval between the sequential cam angle detection signals calculated by the waveform analysis means and the reference time interval of the sequential cam angle reference signals stored in the database. A waveform matching calculation means for calculating matching with a signal waveform;
The cam of the cam angle detection signal waveform corresponding to the predetermined cam angle reference signal position when the calculated value representing the matching calculated by the waveform matching calculating means is within the range of the upper and lower limit values set in advance. The actual crank angle is allocated to the angle detection signal position, and the crank angle is set to the cam angle detection signal position of the cam angle detection signal waveform corresponding to the sequential cam angle detection signal calculated based on the allocated actual crank angle. Interpolation calculation means for assigning by linear interpolation,
An engine crank angle assigning device characterized by comprising: The database stores reference time intervals of sequential cam angle reference signals having different generation time intervals in the cam angle reference signal waveform,
The waveform analysis means calculates time intervals of sequential cam angle detection signals having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the cam shaft of the engine to be inspected,
The waveform matching calculation means sets T (i) as a time interval between sequential cam angle detection signals in the cam angle detection signal waveform, and Tbase (i as a reference time interval between sequential cam angle reference signals in the cam angle reference signal waveform. )

7. The engine crank angle assignment device according to claim 6, wherein j = 1 to N, N: the number of cam angle reference signals for one rotation of the camshaft is calculated. The crank angle reference signal waveform is the signal waveform output from the crank angle sensor that detects the rotation angle of the engine crankshaft when the engine with the regular crankshaft is rotated at a constant speed. A database for storing reference time intervals of sequential crank angle reference signals in a crank angle reference signal waveform in which an actual crank angle is assigned in advance to at least one predetermined crank angle reference signal position;
The engine to be inspected is rotated at the above-mentioned constant rotational speed, a crank angle detection signal waveform output from a crank angle sensor attached to the engine is received, and sequential crank angle detection is performed from the crank angle detection signal waveform. A waveform analysis means for calculating a time interval of the signal;
Based on the time interval of the sequential crank angle detection signal calculated by the waveform analysis means and the reference time interval of the sequential crank angle reference signal stored in the database, the crank angle detection signal waveform and the crank angle A waveform matching computing means for computing matching with a reference signal waveform;
A crank of the crank angle detection signal waveform corresponding to the predetermined crank angle reference signal position when the calculated value representing the matching calculated by the waveform matching calculating means is within a predetermined upper and lower limit value range of the determination value. The actual crank angle is allocated to the angle detection signal position, and the crank angle is set to the crank angle detection signal position of the crank angle detection signal waveform corresponding to the sequential crank angle detection signal calculated based on the allocated actual crank angle. Interpolation calculation means for assigning by linear interpolation,
An engine crank angle assigning device characterized by comprising: The engine is a 4-cycle engine,
The database stores reference time intervals of sequential crank angle reference signals having different generation time intervals in the crank angle reference signal waveform,
The waveform analysis means calculates time intervals of sequential crank angle detection signals having different generation time intervals in the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected,
The waveform matching calculation means sets TC (i) as the time interval between sequential crank angle detection signals in the crank angle detection signal waveform, and TCbase (i as the reference time interval between sequential crank angle reference signals in the crank angle reference signal waveform. )

9. The engine crank angle allocating device according to claim 8, wherein j = 1 to M and M: a crank angle reference signal number for two rotations of the crankshaft is calculated.   The engine crank angle allocating device according to any one of claims 6 to 9, wherein the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. The cam angle reference signal waveform is the signal waveform output from the cam angle sensor to detect the rotation angle of the cam shaft of the engine when the engine with the regular specification cam shaft is rotated at a constant speed. Storing a reference time interval of sequential cam angle reference signals in a cam angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined cam angle reference signal position in advance in a database;
The engine to be inspected is rotated at the constant rotational speed, the cam angle detection signal waveform output from the cam angle sensor attached to the engine is received, and the cam angle detection signal is sequentially generated from the cam angle detection signal waveform. Calculate the time interval of
Based on the calculated time interval of the sequential cam angle detection signal and the reference time interval of the sequential cam angle reference signal stored in the database, the cam angle detection signal waveform and the cam angle reference signal waveform are Calculate matching,
The engine camshaft misassembly is characterized in that it determines that a camshaft of another specification is misassembled when the calculated value representing the matching deviates from the range of the upper and lower limit values of the judgment value set in advance. Detection method. In the database, the reference time intervals of sequential cam angle reference signals with different generation time intervals in the cam angle reference signal waveform are stored,
In the calculation of the time intervals of the sequential cam angle detection signals, the time of the sequential cam angle detection signals having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the cam shaft of the engine to be inspected. Calculate the interval,
In the calculation of the matching between the cam angle detection signal waveform and the cam angle reference signal waveform, T (i) is used as the time interval of sequential cam angle detection signals in the cam angle detection signal waveform, and the cam angle reference signal waveform is sequentially set. When the reference time interval of the cam angle reference signal is Tbase (i),

12. The engine camshaft erroneous assembly detection method according to claim 11, wherein j = 1 to N, N: the cam angle reference signal number of one rotation of the camshaft is calculated.   13. The engine camshaft erroneous assembly detection method according to claim 11 or 12, wherein the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. The cam angle reference signal waveform is the signal waveform output from the cam angle sensor to detect the rotation angle of the cam shaft of the engine when the engine with the regular specification cam shaft is rotated at a constant speed. A database that stores reference time intervals of sequential cam angle reference signals in a cam angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined cam angle reference signal position in advance;
The engine to be inspected is rotated at the constant rotational speed, the cam angle detection signal waveform output from the cam angle sensor attached to the engine is received, and the cam angle detection signal is sequentially generated from the cam angle detection signal waveform. Waveform analysis means for calculating the time interval of,
The cam angle detection signal waveform and the cam angle reference based on the time interval between the sequential cam angle detection signals calculated by the waveform analysis means and the reference time interval of the sequential cam angle reference signals stored in the database. A waveform matching calculation means for calculating matching with a signal waveform;
A determination means for determining that a camshaft of another specification is incorrectly assembled when the calculated value representing the matching calculated by the waveform matching calculation means deviates from a predetermined upper and lower limit range of the determination value;
An engine camshaft erroneous assembly detection device characterized by comprising: The database stores reference time intervals of sequential cam angle reference signals having different generation time intervals in the cam angle reference signal waveform,
The waveform analysis means calculates time intervals of sequential cam angle detection signals having different generation time intervals in the cam angle detection signal waveform generated during one rotation of the cam shaft of the engine to be inspected,
The waveform matching calculation means sets T (i) as a time interval between sequential cam angle detection signals in the cam angle detection signal waveform, and Tbase (i as a reference time interval between sequential cam angle reference signals in the cam angle reference signal waveform. )

The engine camshaft erroneous assembly detection device according to claim 14, wherein j = 1 to N, N: the cam angle reference signal number of one rotation of the camshaft is calculated.   16. The engine camshaft erroneous assembly detection device according to claim 14 or 15, wherein the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. The crank angle reference signal waveform is the signal waveform output from the crank angle sensor that detects the rotation angle of the engine crankshaft when the engine with the regular crankshaft is rotated at a constant speed. Storing a reference time interval of sequential crank angle reference signals in a crank angle reference signal waveform in which an actual crank angle is assigned to at least one predetermined crank angle reference signal position in advance in a database;
The engine to be inspected is rotated at the constant rotation speed, the crank angle detection signal waveform output from the crank angle sensor attached to the engine is received, and the crank angle detection signal is sequentially generated from the crank angle detection signal waveform. Calculate the time interval of
Based on the calculated time interval of the sequential crank angle detection signal and the reference time interval of the sequential crank angle reference signal stored in the database, the crank angle detection signal waveform and the crank angle reference signal waveform are Calculate the matching,
Crankshaft misassembly of an engine characterized in that it is determined that a crankshaft with a different specification is misassembled when the calculated value representing the matching deviates from the range of the upper and lower limits of a preset judgment value. Detection method. The engine is a 4-cycle engine,
In the database, the reference time intervals of sequential crank angle reference signals having different generation time intervals in the crank angle reference signal waveform are stored,
In the calculation of the time interval of the sequential crank angle detection signal, the time of the sequential crank angle detection signal having different generation time intervals in the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected. Calculate the interval,
In the calculation of matching between the crank angle detection signal waveform and the crank angle reference signal waveform, the time interval between sequential crank angle detection signals in the crank angle detection signal waveform is TC (i), and the sequential crank angle reference signal waveform is sequentially set. When the reference time interval of the crank angle reference signal is TCbase (i),

18. The engine crankshaft erroneous assembly detection method according to claim 17, wherein j = 1 to M and M: the number of crank angle reference signals for two rotations of the crankshaft is calculated.   19. The engine crankshaft erroneous assembly detection method according to claim 17 or 18, wherein the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine. The crank angle reference signal waveform is the signal waveform output from the crank angle sensor that detects the rotation angle of the engine crankshaft when the engine with the regular crankshaft is rotated at a constant speed. A database for storing reference time intervals of sequential crank angle reference signals in a crank angle reference signal waveform in which an actual crank angle is assigned in advance to at least one predetermined crank angle reference signal position;
The engine to be inspected is rotated at the above-mentioned constant rotational speed, a crank angle detection signal waveform output from a crank angle sensor attached to the engine is received, and sequential crank angle detection is performed from the crank angle detection signal waveform. A waveform analysis means for calculating a time interval of the signal;
Based on the time interval of the sequential crank angle detection signal calculated by the waveform analysis means and the reference time interval of the sequential crank angle reference signal stored in the database, the crank angle detection signal waveform and the crank angle A waveform matching computing means for computing matching with a reference signal waveform;
A determination means for determining that a crankshaft of another specification is erroneously assembled when the calculated value representing the matching calculated by the waveform matching calculation means deviates from a predetermined upper and lower limit range of the determination value;
An engine crankshaft erroneous assembly detection device characterized by comprising: The engine is a 4-cycle engine,
The database stores reference time intervals of sequential crank angle reference signals having different generation time intervals in the crank angle reference signal waveform,
The waveform analysis means calculates time intervals of sequential crank angle detection signals having different generation time intervals in the crank angle detection signal waveform generated during two rotations of the crankshaft of the engine to be inspected,
The waveform matching calculation means sets TC (i) as the time interval between sequential crank angle detection signals in the crank angle detection signal waveform, and TCbase (i as the reference time interval between sequential crank angle reference signals in the crank angle reference signal waveform. )

21. The engine crankshaft erroneous assembly detection apparatus according to claim 20, wherein j = 1 to M, M: the number of crank angle reference signals for two rotations of the crankshaft is calculated.   22. The engine crankshaft erroneous assembly detection device according to claim 20 or 21, wherein the constant rotational speed is a rotational speed corresponding to an idle rotational speed of the engine.

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