JP5067246B2 - Timing synchronization method and apparatus for engine measurement - Google Patents

Description

  The present invention relates to a timing synchronization method and apparatus in engine measurement used for capturing sensor signals in synchronization with an angle of a crankshaft from various sensors attached to the engine in order to measure a situation during operation of an engine such as a marine engine. It is about.

  When developing a marine engine, various sensors such as a temperature sensor, a pressure sensor, and a sensor for measuring the thickness of a lubricating oil film are attached to the engine, the timing at which the piston passes the sensor installation location, the timing of ignition, etc. Measures the status of the engine during operation by measuring sensor output values from the various sensors in synchronization with the timing at which the piston is placed at a predetermined position during engine operation set for each sensor individually. Tests are being conducted.

  As described above, when capturing sensor signals from various sensors attached to the engine at a predetermined timing during engine operation, the position of the piston during engine operation is usually detected based on the crankshaft angle (rotation angle). Thus, the timing for taking in sensor signals from the various sensors is measured.

  By the way, when measuring events such as engine internal pressure and temperature in synchronization with the angle of the crankshaft of the engine, a pulse signal output from a rotary encoder as a rotation angle sensor attached to the crankshaft is used as a timing signal, and A / D A method of capturing sensor signals from the various sensors using a converter is known (see, for example, Patent Document 1).

  That is, the rotary encoder emits a fixed number of pulses per rotation regardless of the rotation speed, and therefore, the rotary encoder is attached to the crankshaft of the engine, and is emitted once by the rotary encoder for each rotation of the crankshaft. By counting the number of encoder pulses from the origin signal, there is an advantage that the crankshaft angle can be detected without being affected by the engine speed (rotation speed).

  Especially for marine engines, the piston stroke may be several meters, so in order to know exactly when such a large stroke piston passes through the sensor installation location, it is necessary to know the crankshaft angle precisely. Therefore, the present inventors attach a rotary encoder having a large number of encoder pulses generated per revolution to the crankshaft of the marine engine, and the encoder pulses generated by the rotary encoder It is considered to use sensor outputs output from various sensors for measuring the signal as timing pulses for taking in the A / D converter.

JP-A-2005-233035

  However, since the rotary encoder as the rotation angle sensor is a precision instrument, when the rotary encoder is used attached to the crankshaft of an engine that generates large vibrations such as a marine engine, a failure occurs during long-term operation. There is a concern that

  Thus, for example, in a marine engine test, while the engine is continuously operated for several weeks to several months, as described above, based on the angle of the crankshaft detected from the signal of the rotary encoder, By continuously taking sensor signals of various sensors as measurement values in synchronization with a predetermined timing, the operating state of the engine during the test period may be measured or evaluated. If a failure occurs in the rotary encoder when the measurement is continued unattended during a long test period, sensor signals are sent from the various sensors to the A / D converter after the failure occurs in the rotary encoder. Since the timing signal for capturing cannot be obtained, the integration of sensor signals from various sensors is used to measure and evaluate engine operating conditions. There is likely to be insufficient to do correctly.

  Therefore, in the unlikely event of a failure in the rotary encoder, backup means for continuously taking out sensor signals from various sensors in synchronization with a predetermined timing during engine operation may be provided. Although it is desired, no actual means has been proposed in the past to back up such a rotary encoder failure.

  In view of the above, the present invention provides the engine with synchronization with a predetermined timing during engine operation based on the angle of the crankshaft even if a rotation angle sensor such as a rotary encoder attached to the crankshaft of the engine fails. It is an object of the present invention to provide a timing synchronization method and apparatus in engine measurement that can continuously collect sensor signals from various attached sensors and continuously measure the engine operating state.

In order to solve the above problems, the present invention uses a pulse signal output as a timing signal in accordance with the rotation angle of the crankshaft from a rotation angle sensor attached to the crankshaft of the engine. thing takes in the sensor output of the sensor for the engine operating conditions measured in a / D converter which, to obtain the sensor output value in synchronization with the angles of the crankshaft detected on the basis of the pulse signal of the rotation angle sensor In the case where a failure occurs in the rotation angle sensor, the auxiliary timing signal having a fixed frequency output from the auxiliary timing signal generator set to be equal to or higher than the frequency of the pulse signal output from the rotation angle sensor in the normal state. Is used as a timing signal, the sensor output of the sensor for measuring the engine operating state is taken into the A / D converter, and then the above-mentioned compensation is performed. Based timing signal and a reference signal output, one for each revolution of the crankshaft from the reference signal sensor and attached to the crankshaft of the engine, so as to obtain a sensor output value in synchronization with the angles of the crankshaft This is a timing synchronization method in engine measurement.

Further, in the above configuration, an auxiliary timing signal output from the auxiliary timing signal generator, based on the reference signal outputted from the reference signal sensor, when obtaining the sensor output value in synchronization with the angles of the crankshaft, After counting the number of pulses of the auxiliary timing signal corresponding to one rising or falling period of the waveform of the reference signal, the number of cranks per pulse of the auxiliary timing signal is calculated by dividing 360 degrees by the count value. obtains the rotation angle of the shaft, further, angles of the crank shaft, the auxiliary timing signal and calculates how equivalent to what counts th pulse, reaches the number of counts pulses of the auxiliary timing signal is calculated above The sensor output value synchronized with the timing is obtained.

According to a third aspect of the present invention, a rotation angle sensor attached to the crankshaft of the engine and a rectangular wave can be output at a fixed frequency set higher than the frequency of the pulse signal output from the rotation angle sensor. and an auxiliary timing signal generator in Te, and the a / D converter, as a timing signal for taking in sensor output of the sensor for measuring the engine operating conditions, a pulse signal the rotation angle sensor or RaIzuru force the inputs an auxiliary timing signal from the auxiliary timing signal generator, a switch failure in the rotational angle sensor outputs by switching to the auxiliary timing signal from the auxiliary timing signal generator when produced, the and attached to the crankshaft, a reference signal sensor for outputting a reference signal of one signal per revolution of the crankshaft, or the switch Function to give the switching instruction to the switch in response to the presence or absence of incorporation of a sensor output from a sensor of the engine operating conditions for measurement at the A / D converter using the timing signal, and the A / D converter from the sensor output value to be captured by the vessel, and timing synchronization apparatus in an engine measurement having provided comprising configuration and a control device having a function of obtaining a sensor output value at a timing synchronized with the angles of the crank shaft.

Further, in the above configuration, a control unit to obtain a sensor output value that is synchronized from the rotational angle sensor to the angles of the crankshaft detected on the basis of the pulse signal outputted according to the rotation angle of the crankshaft function, to switch, the rotation at the time of failure of the angle sensor, a timing signal for taking in sensor output of the sensor for the engine operating conditions measured by the a / D converter, an auxiliary timing signal from the pulse signal from the rotation angle sensor based the function of generating a switching command for causing the switching to the auxiliary timing signal and a reference signal outputted from the auxiliary timing signal and the reference signal sensor output from the auxiliary timing signal generator from the generator, the corners of the crankshaft And a function of obtaining a sensor output value synchronized with the degree.

According to the present invention, the following excellent effects are exhibited.
(1) A pulse signal output in accordance with the rotation angle of the crankshaft from the rotation angle sensor attached to the crankshaft of the engine is used as a timing signal, so that an A / D converter has a sensor for measuring the engine operating status. It captures the sensor output, so as to obtain a sensor output value in synchronization with the angles of the crankshaft detected on the basis of the pulse signal of the rotational angle sensor, if a failure in the rotational angle sensor has occurred, the normal By using an auxiliary timing signal having a fixed frequency output from the auxiliary timing signal generator set to be equal to or higher than the frequency of the pulse signal output from the rotation angle sensor as the timing signal, the A / D converter is operated with the engine. The sensor output of the sensor for measurement was taken in, and then attached to the auxiliary timing signal and the crankshaft of the engine Based on the reference signal output, one for each revolution of the crankshaft from the quasi-signal sensor, since the timing synchronization method and apparatus in an engine measurement so as to obtain a sensor output value in synchronization with the angles of the crankshaft Even if a failure occurs in the rotation angle sensor, it is possible to continuously obtain the measurement value of the engine operating condition measurement sensor at a timing synchronized with a predetermined angle of the crankshaft.
(2) Further, since the auxiliary timing signal generator for outputting the auxiliary timing signal only needs to be able to output a rectangular wave having a fixed frequency, the auxiliary timing signal generator can have a simple configuration and is not affected by engine vibration. Therefore, it is possible to reduce the possibility of failure. Further, since the reference signal sensor may have a low resolution, it can have a simple structure, and a highly reliable sensor that is less likely to break down can be used. Thereby, the certainty of the backup at the time of failure of the said rotation angle sensor can be made high.
(3) an auxiliary timing signal output from the auxiliary timing signal generator, based on the reference signal outputted from the reference signal sensor, when obtaining the sensor output value in synchronization with the angles of the crankshaft, the reference signal After counting the number of pulses of the auxiliary timing signal corresponding to one rising or falling period of the waveform, the rotation of the crankshaft per one pulse of the auxiliary timing signal is divided by the counted value. determined angle, further, angles of the crank shaft, and calculates how equivalent to what counts th pulse of the auxiliary timing signal, the timing pulses of the auxiliary timing signal, which reaches the number of counts for the calculated The sensor output value is obtained in synchronization with the auxiliary timing signal generator, so that the auxiliary timing signal generator generates a fixed frequency auxiliary timing. Signal, based on the reference signal of the crank shaft one revolution per shot output from the reference signal sensor, can be easily obtained timing to synchronize to a predetermined angle of the crank shaft.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 to 4 (a) and 4 (b) show an embodiment of a timing synchronization method and apparatus in engine measurement according to the present invention, which are as follows.

  That is, FIG. 1 shows a timing synchronization apparatus in engine measurement according to the present invention, which has a configuration in which a piston 5 housed in a cylinder 4 is connected to a crankshaft 3 arranged in a crankcase 2 via a connecting rod 6. A rotary encoder 7 as a rotation angle sensor is attached to the crankshaft 3 in the engine 1 so that the encoder encoder 8 which is a fixed number of pulse signals per one rotation of the crankshaft 3 can be output from the rotary encoder 7.

  An auxiliary timing signal generator 9 that can output a rectangular wave at a fixed frequency as the auxiliary timing signal 10 is provided separately from the engine 1.

  Further, a switch 11 for inputting the encoder pulse 8 from the rotary encoder 7 and the auxiliary timing signal 10 from the auxiliary timing signal generator 9 is provided, and the switch 11 receives a switching command 13 from the control device 12. In response to the A / D converter 14 attached to the control device 12, the encoder pulse is used as the timing signal 15 used for capturing the sensor output (sensor signal) by the A / D converter 14. 8 and auxiliary timing signal 10 are switched so that either one can be output.

  For example, a sensor output 17 of a sensor 16 such as a temperature sensor provided in the cylinder 4 of the engine 1 is input to the A / D converter 14 as a sensor for measuring the operating state of the engine 1. The A / D converter 14 captures the sensor output 17 of the sensor 16 using the timing signal 15 input from the switch 11, so that the control device 12 converts the sensor output 17 to A / D. A sensor output value obtained by D conversion processing is obtained.

  A reference signal sensor 18 is provided at a required portion of the crankshaft 3 so that a signal (pulse) can be output as a reference signal 19 for each rotation in synchronization with the crankshaft 3. The reference signal 19 from the reference signal sensor 18 can also be input to the A / D converter 14.

  The control device 12 uses the timing signal 15 from the switch 11 to the switch 11 in accordance with the capture status when the A / D converter 14 captures the sensor output 17 from the sensor 16. Of the function to give the switching command 13 and the sensor output value obtained by taking in the sensor output 17 by the A / D converter 14, the one synchronized with a predetermined timing during engine operation based on the angle of the crankshaft 3 It shall have the function to save as a measured value.

  The control device 12 has at least the detection accuracy of the rotary encoder 7 when detecting the angle of the crankshaft 3 in the procedure described later based on the auxiliary timing signal 10 generated by the auxiliary timing signal generator 9. From the viewpoint of increasing the detection accuracy to the same level as when detecting the angle of the crankshaft 3 with reference to the encoder pulse 8, the frequency of the auxiliary timing signal 10 generated by the auxiliary timing signal generator 9 is determined by the engine 1. It is desirable that the frequency is set to be equal to or higher than the frequency of the encoder pulse 8 output from the rotary encoder 7 at the maximum rotation speed.

  The reference signal sensor 18 may have a low resolution as long as it has a function capable of outputting one reference signal 19 for each rotation of the crankshaft 3. The type of detecting the rotation of the metal plate attached to the outer periphery of the location with a proximity sensor, the type of detecting the rotation of the plate blocking the light attached to the outer periphery of the required location of the crankshaft 3 with an optical sensor, etc. It is only necessary to adopt a highly reliable sensor that is simple in structure and has few failures due to vibration or the like.

  Next, the timing synchronization method in engine measurement according to the present invention will be described in detail in accordance with the processing contents by the control device 12. FIG. 2 shows a flow of a processing procedure by the control device 12. First, the control device 12 uses the encoder pulse 8 input from the rotary encoder 7 attached to the crankshaft 3 to the switch 11 as a timing signal 15. A switching command 13 is given to output to the A / D converter 14 (step 1: S1).

  Next, the A / D converter 14 uses the timing signal 15 input from the switch 11 to determine whether or not the sensor output 17 from the engine operating condition measurement sensor 16 is taken in (step). 2: S2) When the sensor output 17 is captured by the A / D converter 14, the control device 12 applies the encoder pulse 8 input as the timing signal 15 to the A / D converter 14. On the basis of the angle of the crankshaft 3 (step 3: S3), the sensor output value obtained by taking in the sensor output 17 by the A / D converter 14 is synchronized with a predetermined crankshaft angle. The sensor output value at the determined timing is stored as a measured value (step 4: S4).

  Specifically, when the sensor output value as shown by line A in FIG. 3 is obtained by the control device 12, the encoder pulse 8 input to the A / D converter 14 as the timing signal 15 is a rotary encoder. 7, since the angle of the crankshaft 3 can be detected by counting the number of pulses from the origin signal (pulse) B that is generated once every rotation of the origin 7, the origin signal B is detected in the sensor output value (line A). 3 is stored in the control device 12 as a measured value S1 synchronized with a predetermined timing during engine operation, for example, at a timing synchronized with a certain C count pulse, for example, a timing indicated by a two-dot chain line in FIG. I have to do it. Thus, even when the engine speed is different, the timing at which the crankshaft 3 reaches a predetermined crankshaft angle during engine operation by synchronizing with the pulse of the Cth count from the origin signal B in the encoder pulse 8 The measured value a can be stored at a timing that exactly matches the value.

  Thereafter, the process returns to step 2 (S2), and while the sensor output 17 from the sensor 16 is captured by the A / D converter 14 using the encoder pulse 8 as the timing signal 15, the step 2 (S2). The sensor output values are sequentially stored at a timing synchronized with the timing at which the crankshaft 3 reaches a predetermined crankshaft angle by sequentially repeating the processing of step 4 (S4).

  On the other hand, in step 2 (S2), the A / D converter 14 takes in the sensor output 17 from the sensor 16 using the encoder pulse 8 input from the switch 11 as the timing signal 15. If it is determined that the sensor output 17 is not captured, the process proceeds to step 5 (S5), where it is determined whether or not a certain period of time has elapsed since the sensor output 17 is not taken into the A / D converter 14. Before the elapse of time, the process returns to step 2 (S2), and the processes of step 2 (S2) and step 5 (S5) are repeated until the predetermined time elapses. As a result, even if the sensor output 17 is not taken into the A / D converter 14, it is possible to wait until the predetermined time elapses.

  After that, in step 5 (S5), when the sensor output 17 using the encoder pulse 8 as the timing signal 15 in the A / D converter 14 is not captured even after a predetermined time has passed, that is, If the sensor output for one rotation of the crankshaft is not captured even after the predetermined time has elapsed, it is determined that a time-out has occurred, and the process proceeds to step 6 (S6) to determine whether or not the engine 1 has stopped operating. Make a decision.

  At this time, since the encoder pulse 8 is not output from the rotary encoder 7 attached to the crankshaft 3 when the engine 1 is stopped, the timing signal 15 is input from the switch 11 to the A / D converter 14. Not. Therefore, even if the sensor output 17 is not captured by the A / D converter 14, it is not abnormal. Therefore, in this case, the process returns to step 2 (S2) to continue the process.

  On the other hand, when it is determined in step 6 (S6) that the engine 1 is not stopped, that is, although the engine 1 is in an operating state, the A / D converter 14 outputs the encoder pulse 8 as a timing signal. If the sensor output 17 used as 15 is not captured, the process proceeds to step 7 (S7), where the rotary encoder 7 fails, and therefore the timing signal 15 is not input to the A / D converter 14. Therefore, the control device 12 gives the switching command 13 to the switch 11 so that the auxiliary timing signal 10 input from the auxiliary timing signal generator 9 is output to the A / D converter 14 as the timing signal 15. .

  Thereafter, in the same manner as in step 2 (S2), the sensor output 17 from the engine operating condition measurement sensor 16 is obtained using the timing signal 15 input from the switch 11 in the A / D converter 14. It is determined whether or not it is taken in (step 8: S8).

  If it is determined in step 8 (S8) that the sensor output 17 is captured by the A / D converter 14, the control device 12 inputs the timing signal 15 to the A / D converter 14. The angle of the crankshaft 3 is detected from the auxiliary timing signal 10 being received and the reference signal 19 input from the reference signal sensor 18 (step 9: S9), and the A / D converter 14 outputs a sensor output 17 Among the sensor output values obtained by taking in, the sensor output value at the timing synchronized with a predetermined crankshaft angle is stored as a measured value (step 10: S10).

  Specifically, when a sensor output value as indicated by a line A in FIGS. 4A and 4B is obtained by the control device 12, the auxiliary signal input to the A / D converter 14 as the timing signal 15 described above. The timing signal 10 is always constant even when the engine speed is fast as shown in FIG. 4 (a) or when the engine speed is slow as shown in FIG. 4 (b). Therefore, the measured value at a predetermined timing synchronized with the angle of the crankshaft 3 of the engine 1 cannot be obtained for the sensor output value (line A) as it is.

  Therefore, the control device 12 refers to the reference signal 19 as shown in FIGS. 4A and 4B obtained from the reference signal sensor 18 via the A / D converter 14, and the reference signal 19 is Based on the fact that one signal is generated for each rotation of the crankshaft 3 in synchronization with the rotation of the shaft 3, from the rising edge of the first waveform of the reference signal 19 to the rising edge of the next waveform, or One cycle from the fall of the first waveform to the fall of the next waveform, that is, how many pulses of the auxiliary timing signal 10 correspond to one rotation of the crankshaft 3, and 360 degrees as the count value By dividing, the rotation angle of the crankshaft 3 per pulse of the auxiliary timing signal 10 is obtained.

  For example, as shown in FIG. 4A, when the rising interval of the waveform of the reference signal 19 corresponds to the D count of the auxiliary timing signal 10, the rotation angle of the crankshaft 3 per pulse of the auxiliary timing signal 10 Becomes (360 ÷ D) degrees. Further, as shown in FIG. 4B, when the engine speed is smaller (the rotation speed of the crankshaft 3 is slower), the interval at which the waveform of the reference signal 19 rises is equal to the E count of the auxiliary timing signal 10. In the case of (E> D), the rotation angle of the crankshaft 3 per pulse of the auxiliary timing signal 10 becomes (360 ÷ E) degrees. Therefore, the rotation angle of the crankshaft 3 per pulse of the auxiliary timing signal 10 changes according to the engine speed.

  Therefore, the control device 12 saves the sensor output value (line A) at a timing synchronized with a predetermined timing during engine operation as a measured value, so that the reference signal 19 synchronized with the rotation of the crankshaft 3 is stored. The rotation angle of the crankshaft 3 from the origin determined on the basis of the rise or fall of the crankshaft to the timing at which the measured value should be stored is obtained, and the rotation angle of the crankshaft 3 is determined by the above formula. By dividing by the rotation angle of the crankshaft 3 per pulse of the signal 10, it is calculated how many counts of pulses of the auxiliary timing signal 10 the timing at which the measured value should be stored is from the origin, In synchronization with the timing at which the pulse of the auxiliary timing signal 10 counted from the origin reaches the calculated count number, the sensor output value ( The value of A), are to be stored as a measurement value in synchronization with a predetermined timing during the engine operation.

  Thereafter, the process returns to step 8 (S8), and while the sensor output 17 from the sensor 16 using the auxiliary timing signal 10 as the timing signal 15 is being taken into the A / D converter 14, By sequentially repeating the processing from step 8 (S8) to step 10 (S10), the sensor output values are sequentially stored at a timing synchronized with the timing at which the crankshaft 3 reaches the predetermined crankshaft 3 angle.

  On the other hand, in step 8 (S8), the A / D converter 14 determines that the sensor output 17 from the sensor 16 using the auxiliary timing signal 10 as the timing signal 15 is not captured. If so, the process proceeds to step 11 (S11) to determine whether or not a certain period of time has elapsed in which the sensor output 17 is not taken into the A / D converter 14. Returning to step 8 (S8), the processes of step 8 (S8) and step 11 (S11) are repeated until the predetermined time elapses. As a result, even if the sensor output 17 is not taken into the A / D converter 14, it is possible to wait until the predetermined time elapses.

  On the other hand, in step 11 (S11), if the sensor output 17 using the auxiliary timing signal 10 in the A / D converter 14 as the timing signal 15 is not captured even after a predetermined time has elapsed, that is, If the sensor output 17 for one rotation of the crankshaft is not captured even after the predetermined time has elapsed, the control device 12 determines that a timeout has occurred, and in this case, the sensor output 17 is sent to the A / D converter 14. Since it can be determined that the failure is not caused by a failure of the rotary encoder 7, the control device 12 ends the process.

  As described above, when the timing synchronization method and apparatus in engine measurement of the present invention is used, while the rotary encoder 7 provided on the crankshaft 3 is functioning normally, the encoder pulse 8 output by the rotary encoder 7 is: Since the switch 11 outputs the sensor output 17 to the A / D converter 14 as the timing signal 15, the controller 12 uses the A / D converter 14 to convert the encoder pulse 8 as the timing signal 15. A captured sensor output value can be obtained, and the sensor output value is synchronized with a predetermined timing during engine operation corresponding to a predetermined angle of the crankshaft 3 detected based on the encoder pulse 8. Are sequentially stored in the control device 12 as measured values.

  When a failure occurs in the rotary encoder 7, the switch 11 receives the timing signal 15 for taking in the sensor output 17 output from the sensor 16 for measuring the engine operating state by the A / D converter 14. By switching the encoder pulse 8 output from the rotary encoder 7 to the auxiliary timing signal 10 having a fixed frequency output from the auxiliary timing signal generator 9, the A / D converter 14 timings the auxiliary timing signal 10. The sensor output 17 is continuously captured using the signal 15.

  Further, in synchronization with the rotation of the crankshaft 3 of the engine 1, from the reference signal 19 output from the reference signal sensor 18 for each rotation of the crankshaft 3 and the auxiliary timing signal 10, the control device 12 By calculating the rotation angle of the crankshaft 3 per pulse of the auxiliary timing signal 10, the auxiliary timing signal 10 has a predetermined timing during engine operation corresponding to the predetermined angle of the crankshaft 3 as the fixed frequency. The sensor output value at the timing synchronized with the predetermined timing during engine operation corresponding to the predetermined angle of the crankshaft 3 is sequentially stored in the control device 12 as a measured value. Will continue to be performed.

  As described above, according to the timing synchronization method and apparatus for engine measurement of the present invention, the sensor output 17 that is attached to the crankshaft 3 and is output from the sensor for measuring the engine operating state by the A / D converter 14 is captured. Even if a failure occurs in the rotary encoder 7 for generating the timing signal 15 for the measurement, the sensor 16 measures at a timing synchronized with a predetermined timing during engine operation corresponding to a predetermined angle of the crankshaft 3. The value can be obtained continuously.

  In addition, the auxiliary timing signal generator 9 that outputs the auxiliary timing signal 10 only needs to be able to output a rectangular wave having a fixed frequency, so that it can have a simple configuration and can reduce the possibility of failure. The auxiliary timing signal generator 9 can be installed separately from the engine 1, that is, at a location not affected by the vibration of the engine 1, thereby reducing the possibility of failure. Further, as described above, the reference signal sensor 18 has a simple structure and is less susceptible to failure due to vibration or the like, and uses a highly reliable sensor, so that backup of the rotary encoder 7 can be ensured in the event of a failure. The property can be made high.

  The present invention is not limited only to the above-described embodiment. For example, if the rotation angle sensor can output a pulse signal according to the rotation angle of the crankshaft of the engine, for example, A rotation angle sensor other than the rotary encoder 7 such as a rotation angle sensor including a resolver and a unit that converts a sine wave output from the resolver into a pulse wave may be used.

  If the sensor 16 for measuring the engine operating condition is a sensor that needs to obtain a measured value at a predetermined timing during engine operation corresponding to a predetermined angle of the crankshaft 3, a part other than the cylinder in the engine Further, it may be a sensor provided in a device not shown. Any sensor other than the temperature sensor may be used.

  The timing synchronization method and apparatus in engine measurement of the present invention is a case where it is desired to capture the signal of a sensor that measures the engine operating state in synchronization with the timing at which the engine crankshaft is at a predetermined angle. It can be applied to other than testing. Moreover, you may apply to any engines other than a marine engine.

  Of course, various modifications can be made without departing from the scope of the present invention.

It is a schematic diagram showing one embodiment of a timing synchronization method and apparatus in engine measurement of the present invention. It is a flowchart which shows the process sequence in the control apparatus of the apparatus of FIG. FIG. 2 is a diagram specifically showing processing in a case where a sensor output value is stored as a measured value in synchronization with a timing of a predetermined engine operating state on the basis of an encoder pulse in the control device of the apparatus of FIG. 1. FIG. 2 is a diagram specifically showing processing in a case where a sensor output value is stored as a measured value in synchronization with a timing of a predetermined engine operating state based on an auxiliary timing signal and a reference signal in the control device of the apparatus of FIG. 1. (A) shows the case where the engine speed is fast, and (b) shows the case where the engine speed is slow.

Explanation of symbols

1 Engine 3 Crankshaft 7 Rotary encoder (rotation angle sensor)
8 Encoder pulse (pulse signal)
9 Auxiliary timing signal generator 10 Auxiliary timing signal
DESCRIPTION OF SYMBOLS 11 Switch 14 A / D converter 15 Timing signal 16 Sensor for engine operating condition measurement 17 Sensor output 18 Reference signal sensor 19 Reference signal

Claims (4)

By using a pulse signal output according to the rotation angle of the crankshaft as a timing signal from the rotation angle sensor attached to the crankshaft of the engine, the sensor output of the sensor for measuring the engine operating status is sent to the A / D converter. takes in, so as to obtain a sensor output value in synchronization with the angles of the crankshaft detected on the basis of the pulse signal of the rotational angle sensor, if a failure in the rotational angle sensor is generated, the rotation angle of the normal By using an auxiliary timing signal having a fixed frequency output from the auxiliary timing signal generator set to be equal to or higher than the frequency of the pulse signal output from the sensor as a timing signal, the A / D converter is used for measuring the engine operating condition. The sensor output of the sensor is captured, then the above auxiliary timing signal and the reference signal attached to the crankshaft of the engine Based on the reference signal one output per revolution of the crankshaft from the sensor, the timing synchronization method in an engine measurement, characterized in that to obtain a sensor output value in synchronization with the angles of the crank shaft. An auxiliary timing signal output from the auxiliary timing signal generator, based on the reference signal outputted from the reference signal sensor, when obtaining the sensor output value in synchronization with the angles of the crankshaft, the waveform of the reference signal After counting the number of pulses of the auxiliary timing signal corresponding to one rising or falling period, the rotation angle of the crankshaft per pulse of the auxiliary timing signal is obtained by dividing 360 degrees by the count value. further, angles of the crank shaft, and calculates how equivalent to many count th pulse of the auxiliary timing signal, the pulses of the auxiliary timing signal synchronized with the timing reaches the number of counts calculated the sensor The timing synchronization method in engine measurement according to claim 1, wherein an output value is obtained. Comprising a rotation angle sensor attached to a crankshaft of an engine, and an auxiliary timing signal generator are also available outputs a square wave at a fixed frequency set in the higher frequency of the pulse signal outputted from the rotation angle sensor and the a / D converter, as a timing signal for taking in sensor output of the sensor for measuring the engine operating conditions, a pulse signal the rotation angle sensor or RaIzuru force auxiliary from the auxiliary timing signal generator enter a timing signal, and a switch for switching and outputting to the auxiliary timing signal from the auxiliary timing signal generator when a failure in the rotational angle sensor has occurred, and attached to the crankshaft, said crankshaft Uses a reference signal sensor that outputs one signal as a reference signal for each rotation and a timing signal from the switch Functions to provide a switching command to said switch in response to the presence or absence of incorporation of the sensor output from the sensor for the engine operating conditions measured in the A / D converter, and a sensor incorporated in the A / D converter the output value, timing synchronization apparatus in an engine measurement, characterized in that it has a provided comprising configuration and a control device having a function of obtaining a sensor output value at a timing synchronized with the angles of the crank shaft. A control unit, and a rotation angle sensor function to obtain a sensor output value in synchronization with the angles of the crankshaft is detected based on the pulse signal outputted according to the rotation angle of the crank shaft, to switch, the when a failure of the rotation angle sensor, a timing signal for taking in sensor output of the sensor for the engine operating conditions measured by the a / D converter, an auxiliary timing from the auxiliary timing signal generator from a pulse signal from the rotation angle sensor based the function of generating a switching command for causing the switching to the signal, and a reference signal outputted from the auxiliary timing signal and the reference signal sensor output from the auxiliary timing signal generator, the sensor output in synchronization with the angles of the crankshaft The timing synchronization device for engine measurement according to claim 3, wherein the timing synchronization device has a function of obtaining a value.

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