JP2005076617A - Driving device for accessory for engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To freely arrange a mechanical lubricator, while synchronizing rotation of the mechanical lubricator with rotation of an engine. <P>SOLUTION: In a driving device for the mechanical lubricator 4 for lubricating a cylinder of the engine 2 synchronously with rotation of an output shaft 10 of the engine 2, rotating speed of the output shaft 10 of the engine 2 is detected by proximity switches 22a-22c, and sent as an output shaft speed. A motor 8 is connected to a load shaft 6 for driving the mechanical lubricator 4. A load shaft detector for sending rotating speed of the load shaft 6 as a load shaft speed is provided in the motor 8. A controller integrated inverter control unit, wherein a load shaft speed signal and the output shaft speed are to be input, is provided to control the motor 8 so that rotating speed of the output shaft 10 and the load shaft 6 coincide with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drive device for driving an accessory of an engine of an internal combustion engine, for example, a marine engine (for example, a fuel pump, a lubricator, or a water injector).

  The engine of an internal combustion engine includes an accessory device that is driven in synchronization with the rotation shaft of the engine. Examples of the accessory device include a fuel pump, a lubricator, and a water injector. An example of the lubricator is disclosed in Patent Document 1.

Japanese Utility Model Publication No. 6-80804 (paragraph numbers 0010 and 0011)

  In Patent Document 1, a plurality of lubricators (attached devices) are provided corresponding to each cylinder of the engine. The drive shafts of the respective lubricators are connected to each other. The drive shaft of one lubricator is connected to the output shaft (rotary shaft) of the engine via a gear mechanism or other interlocking mechanism, and the drive shaft of one lubricator is rotated according to the rotation of the engine. Along with this, the drive shaft of the other lubricator is also rotated. The reason why the drive shaft of the lubricator is rotated by the output shaft of the engine is to make the rotational speeds of the engine output shaft and the drive shaft of the lubricator coincide.

  In the technique disclosed in Patent Document 1, since the accessory device needs to be mechanically coupled to the output shaft of the engine, the installation position of the accessory device (fuel pump, lubricator, water injection device) is naturally determined, and its arrangement There was a problem that was limited.

  An object of this invention is to provide the drive apparatus of the engine accessory apparatus which can arrange | position an accessory apparatus freely.

  The drive device for an engine accessory according to one aspect of the present invention drives the accessory in synchronization with the rotation of the output shaft of the engine. An output shaft detector is provided that sends the rotational speed of the output shaft of the engine as the output shaft speed. An electric motor is connected to a load shaft that drives the accessory device. A load shaft detector for sending the rotation speed of the load shaft as a load shaft speed is provided in the load shaft or the electric motor. A control unit to which the load shaft speed signal and the output shaft speed are input is provided. The control unit controls the electric motor so that the rotation speeds of the output shaft and the load shaft coincide.

  In the drive device for an engine accessory device configured as described above, the accessory device is driven by the electric motor, so that the degree of freedom of the arrangement position of the accessory device can be increased. This makes it easy to change or add accessory equipment. Moreover, the electric motor is controlled by the control unit so that the speeds of the load shaft and the output shaft coincide.

  The output shaft detector can be connected to a pulse generating means for detecting an unevenness of a gear fixed to the output shaft of the engine and generating an engine pulse. A proximity switch or a photoelectric detector can be used as the pulse generating means. The output shaft detector generates a multiplied pulse obtained by multiplying the engine pulse by a predetermined multiple, and transmits the multiplied pulse as the output shaft speed signal.

  Since the multiplied pulse obtained by multiplying the engine pulse is used, a slight change in the rotation of the engine can be grasped, and the control resolution of the electric motor can be increased. As a result, the followability and responsiveness of the load shaft speed to the output shaft speed can be improved.

  Further, the output shaft generator has a frequency divider that generates a frequency-divided pulse obtained by dividing the frequency-multiplied pulse into the predetermined multiple, and the frequency-divided pulse is compared with the engine pulse to thereby calculate the frequency-divided pulse. The multiplied pulse can be changed so that the period of the pulse coincides with the period of the engine pulse. For example, the period of the multiplied pulse is controlled according to whether the divided pulse is faster or slower than the engine pulse. Therefore, for example, the frequency-divided pulse generated by the pulse oscillating means is divided by the frequency divider, the phase of the frequency-divided pulse and the engine pulse is compared, and the frequency-multiplied pulse from the pulse oscillating means is based on the comparison result. Control the phase of.

  Since it comprises in this way, even if engine rotation fluctuates for every cycle of the engine pulse based on engine rotation, the load shaft of an accessory apparatus can be rotated following this change.

  In any one of the above aspects, the engine can be a marine engine that performs forward rotation and reverse rotation. In this case, the control unit controls the electric motor so that the accessory device can be driven at a different timing from the normal rotation during the reverse rotation of the engine and the load shaft can be rotated with a rotation angle shifted with respect to the output shaft. Is desirable.

  If comprised in this way, an accessory apparatus can be driven at a desired timing at the time of reverse rotation and forward rotation of an engine, respectively.

  Furthermore, the output shaft detector can include a rotation direction determination device that determines whether the engine is rotating forward or backward. In this case, when the rotation direction determination unit detects that the rotation direction of the engine has changed, the control unit changes the rotation direction of the load shaft with respect to the output shaft according to the rotation direction of the engine.

  If comprised in this way, when the rotation direction of an engine will be reverse from the former, the rotation direction of an accessory apparatus can be changed immediately.

  The load shaft can be made rotatable without being synchronized with the output shaft. This can be achieved by sending a control signal independent of the signal from the pulse generating means.

  If comprised in this way, it is possible to check an accessory apparatus, without rotating an engine. Further, even when the output shaft speed signal cannot be obtained for some reason, it is possible to drive the accessory device at a predetermined rotation, and the occurrence of the worst situation of stopping the engine can be avoided.

As described above, according to the present invention, the accessory device is driven by the electric motor that is mechanically separated from the engine. And can be added easily. Further, the engine rotation can be detected in a non-contact manner, and the load shaft of the accessory device can be controlled with a fine resolution and quick response by an output shaft speed signal such as a multiplication pulse transmitted from the control device.
In addition, since the electric motor can change the rotation phase of the load shaft of the accessory device while synchronizing with the rotation of the engine, the accessory device can be driven at a desired timing.

  As shown in FIG. 1, the drive device for an engine accessory according to an embodiment of the present invention includes, for example, an electric motor that drives the load shaft 6 of the accessory 4 of the marine engine 2, for example, an inverter motor 8 with a speed reducer. doing. The driving of the load shaft 6 of the accessory device 4 is not performed by the output shaft 10 of the engine 2 but by the inverter motor 8. Therefore, the attachment position of the accessory device 4 is high, and the accessory device 4 can be easily changed or added.

  Control of the inverter motor 8 is performed by a controller-integrated inverter 12 a or 12 b included in the control unit 51. Normally, the inverter 12 a is used for controlling the inverter motor 8. However, when the inverter 12a fails, the inverter 12b is used. That is, the inverter 12b is for backup. A control signal from the inverter 12a or 12b is supplied to the inverter motor 8 via the open / close switch 14a or 14b.

  In order to use the inverter motor 8 for controlling the inverter motor 8 by the inverter 12a or 12b, the inverter motor 8 is provided with a rotation detection unit (not shown) for detecting the rotation speed of the load shaft 6, for example, a rotary encoder. Yes. This encoder generates a feedback pulse signal every time the load shaft 6 rotates by a predetermined angle. This feedback pulse signal is supplied to the inverters 12 a and 12 b via the control unit electronic circuit board 16 that forms part of the control unit 51. In FIG. 1, this feedback signal is shown as being transmitted through one line, but in reality, three feedback pulse signals having different phases are transmitted through three transmission lines. Yes. This feedback pulse signal can also be supplied directly to the inverters 12a and 12b without going through the control unit electronic circuit board 16.

  Origin detection means for detecting that the load shaft 6 has made one rotation, for example, origin detection proximity switches 18a and 18b are provided in the vicinity of the load shaft 6, and dogs (see FIG. (Not shown), that is, every time the load shaft 6 makes one revolution, a pulse signal is generated as an origin signal. This origin signal is also supplied to the inverters 12a and 12b via the control unit electronic circuit board 16. Of the two origin detection proximity switches 18a and 18b, one is for backup.

  In addition, in order to detect the rotational speed of the output shaft 10 of the engine 2, a plurality of, for example, three pulse generating means, for example, three rotations of the flywheel (gear) 20 of the engine attached to the output shaft 10 are performed. The rotation detection proximity switches 22a to 22c detect. These proximity switches 22 a to 22 c generate an engine pulse signal each time one of a plurality of teeth formed on the peripheral edge of the flywheel 20 is detected, and are arranged around the output shaft 10. The proximity switches 22a to 22c are arranged so that adjacent ones of the proximity switches 22a to 22c form a predetermined angle. Since three proximity switches 22a to 22c are provided, the rotation direction can be detected by using two of them, and the other one is used for backup. The engine pulse signals from the proximity switches 22a to 22c are supplied to the control unit electronic circuit board 16.

  In order to detect one rotation every time the output shaft 10 of the engine 2 makes one rotation, an origin detection means, for example, origin detection proximity switches 24a and 24b are provided in the vicinity of the output shaft 10. The proximity switches 24a and 24b also generate a pulse signal as an origin signal every time a dog (not shown) provided at a predetermined position of the flywheel 20 is detected, that is, every time the output shaft 10 rotates once. The reason why the two proximity switches 24a and 24b are provided is to use one for backup. This origin signal is also supplied to the control unit electronic circuit board 16. The control unit electronic circuit board 16 can output a simulated origin signal by setting the number of teeth of the flywheel (gear) 20.

  The controller electronic circuit board 16 processes two of the engine pulse signals from the rotation detection proximity switches 22a to 22c, detects the rotation direction of the output shaft 10 of the engine 2, and generates a rotation direction detection signal. This rotation direction detection signal is output to the inverters 12a and 12b. The control unit electronic circuit board 16 processes the engine pulse signal from the rotation detection proximity switches 22a to 22c and converts it into a multiplied pulse signal. This multiplied pulse signal is also supplied to the inverters 12a and 12b. The control unit electronic circuit board 16 also supplies origin signals from the origin detection proximity switches 24a and 24b to the inverters 12a and 12b.

  As shown in FIG. 2, the control unit electronic circuit board 16 has a terminal block 26 to which engine pulse signals from the proximity switches 22a to 22c are supplied. These engine pulse signals are supplied to the pulse input unit 28. The pulse input unit 28 regenerates a pulse after insulating the engine pulse signal. The regenerated engine pulse signal is supplied to the rotation direction detection unit 30, the disconnection detection unit 32, the rotation level detection unit 34, and the pulse multiplication unit 36.

  The rotation direction detection unit 30 receives the regenerated engine pulse signal and determines the rotation direction of the engine 2. That is, the rotational direction of the engine 2 is determined based on which of the two engine pulse signals from the proximity switches 22a to 22c is generated faster. Even if any one of the wires from the proximity switches 22a to 22c to the terminal block 26 is disconnected, the rotation direction is detected based on the pulse signals transmitted by the remaining two lines.

  The disconnection detection unit 32 inspects whether the wiring from the proximity switches 22a to 22c to the terminal block 26 is disconnected based on the regenerated engine pulse signal corresponding to the engine pulse signal of the proximity switches 22a to 22c. The result is displayed on a display unit, for example, the monitor LED 38.

  The rotation level detector 34 detects the rotation speed of the engine 2 based on the regeneration pulse engine signal corresponding to the engine pulse signals of the proximity switches 22a to 22c, and displays the rotation speed on the monitor LED 38. The rotation direction determined by the rotation direction detection unit 30 is also displayed on the monitor LED 38.

  The pulse multiplier 36 multiplies the regenerated engine pulse signal into a multiplied pulse signal having a frequency proportional to the multiplication number set by the multiplication number setting means, for example, the tooth number setting unit 40. This multiplied pulse signal is set to have substantially the same frequency as the feedback pulse signal from the inverter motor 8. Details of the configuration of the pulse multiplier 36 will be described later.

  The multiplied pulse signal and the rotation direction detection signal from the rotation direction detection unit 30 are supplied to the pulse output unit 42 and converted into, for example, an RS-422 line drive output. The origin signal from the origin detection proximity switches 24a and 24b supplied to the terminal 44 is also supplied to the pulse output unit 42 and converted into a line drive output. Output signals from the pulse output unit 42 (multiplied pulse signals converted into line drive outputs, rotation direction detection signals, and origin signals) are supplied to the inverters 12a and 12b via the connectors 46a and 46b, respectively.

  The feedback pulse signal supplied via the connector 48 is supplied to the feedback branch unit 50, subjected to waveform processing for the inverters 12a and 12b, and supplied to the inverters 12a and 12b via the connectors 52a and 52b.

  The inverter 12a or 12b rotates the inverter motor 8 in the rotation direction represented by the rotation direction detection signal, and the inverter motor 8 so that the phase of the feedback pulse signal maintains a predetermined relationship with the phase of the multiplied pulse signal. Control the rotation of Thereby, the accessory device 4 and the engine 2 are operated synchronously. That is, when the rotation speed of the engine 2 increases, the rotation speed of the load shaft 6 of the accessory device 4 also increases in synchronization with this, and when the rotation speed of the engine 2 decreases, the load shaft of the accessory device 4 synchronizes with this. The number of rotations of 6 is also reduced.

The inverter motor 8 can be rotated in synchronism with the engine 2 completely, or can be rotated by advancing or delaying the phase with respect to the rotation of the engine 2 by a predetermined amount. it can. Therefore, it is possible to drive the accessory device 4 at a timing according to the rotational speed of the engine 2 and the load of the engine 2. Further, the phase amount to be varied can be set independently for the case where the engine 2 is rotating forward and when the engine 2 is rotating backward. In this way, by making the phases different during forward rotation and reverse rotation, the accessory device 4 can be driven at a different timing from the forward rotation when the engine 2 is reverse. In addition, since the fact that the engine 2 has changed from the normal rotation state to the reverse rotation state can be recognized by the rotation direction detection signal, the accessory device can be driven immediately at the timing according to the reverse rotation.
For example, when the accessory device is a fuel pump, the fuel can be injected at a timing corresponding to the load and the rotation direction by performing the control as described above. Thereby, reduction of Nox and fuel consumption can be improved. In addition, when the accessory device is an oil pump, the amount of oil supply can be reduced because the lubricating oil can be supplied at a timing according to the load and the rotation direction.

  Further, since the origin detection signal for the inverter motor 8 is supplied to the inverters 12a and 12b, the inverters 12a and 12b can recognize that the inverter motor 8 has made one revolution, so that the load is increased every revolution. It is possible to correct the shift of the rotation angle of the shaft 6 with respect to the output shaft 4, and it is possible to prevent the error from being accumulated and to increase the shift of the rotation angle.

  In order to cause the inverter 12a or 12b to perform such control, a control command is supplied to the inverters 12a and 12b via the PLC (programmable logic control) 56 from the operation unit 54 shown in FIG. In addition, a signal representing a control state by the inverters 12 a and 12 b is supplied to the operation unit 52 via the PLC 54 and displayed on the operation unit 52.

  Further, by supplying a control signal from the operation unit 52 to the inverter 12a or 12b via the PLC 54, the inverter 12a or 12b can rotate the accessory device 4 even in a state where the multiplied pulse signal is not supplied. . Accordingly, the accessory device 4 can be inspected while the engine 2 is not rotating. In addition, although the engine 2 is rotating, the accessory device 4 can be operated even when the multiplied pulse signal is not generated for some reason.

  As shown in FIG. 3, the pulse multiplier 36 has frequency dividing means, for example, a frequency divider 36a. The frequency divider 36a receives one of the regenerated pulse signals from the pulse input unit 28 and divides the frequency into a predetermined frequency division number R, for example, two. This frequency-divided signal is supplied to phase comparison means, for example, the phase comparator 36b. The phase comparator 36b is also supplied with a pulse oscillating means, for example, a frequency-divided signal obtained by frequency-dividing the oscillation signal oscillated by the voltage controlled oscillator 36c by the frequency divider 36d. The frequency division number N in the frequency divider 36d is supplied from the tooth number setting switch 40. The phase comparator 36b supplies a signal representing the phase difference between the two input frequency-divided signals to the voltage controlled oscillator 36c. The frequency of the oscillation signal changes according to this signal.

  This control is so-called PLL control, and the frequency of the oscillation signal of the oscillator 36c is f2 = f1 when the frequency of the regenerated pulse signal is f1 and the frequency of the oscillation signal of the voltage controlled oscillator 36 is f2, as is well known. * N / R, f1 multiplied by N / R times.

  FIG. 5 shows the waveforms of the respective parts of the pulse multiplier 36 when N = 10 and R = 2 and the periods of the frequency-divided signals from the frequency dividers 36a and 36d match. 5A shows the regenerated engine pulse input to the frequency divider 36a, FIG. 5B shows the frequency-divided signal from the frequency divider 36a, and FIG. 5C shows the frequency divider 36d. (D) shows the oscillation signal of the voltage controlled oscillator 36c. In this way, the regenerated engine pulse signal representing the rotation of the engine 2 is multiplied. By multiplying the regenerated engine pulse signal, the rotational state of the engine 2 is expressed finely. In particular, by making the multiplication number N / R coincide with the feedback signal of the inverter motor 8, it is not necessary to multiply the feedback pulse signal, and control can be easily performed. Since the inverter motor 8 is controlled using this multiplied pulse signal, the inverter motor 8 can be controlled with high resolution.

  Further, when the phases of the frequency-divided signals of the frequency dividers 36a and 36d do not match, the frequency of the oscillation signal of the voltage-controlled oscillator 36c is changed so that the two match. 6A shows the frequency-divided signal of the frequency divider 36a, FIG. 6B shows the frequency-divided signal of the frequency divider 36d, and FIG. 6C shows the output of the phase comparator 36b. FIG. 4D shows an oscillation signal of the voltage controlled oscillator 36c.

  As shown in the first half of FIGS. 6A and 6B, when the frequency-divided signal from the frequency divider 36d is slower than the frequency-divided signal from the frequency divider 36a, the phase delay occurs. The period during which the output of the phase comparator 36b is generated becomes longer in the positive direction as shown in the first half of the figure (c), and the oscillation signal of the voltage controlled oscillator 36c is shown in the first half of the figure (d). The cycle is accelerated. Further, as shown in the middle part of FIGS. 6A and 6B, the frequency-divided signal from the frequency divider 36a is slower than the frequency-divided signal from the frequency divider 36d. When it becomes smaller, as shown in the middle part of FIG. 6C, the period in which the output of the phase comparator 36b is generated becomes shorter than that of the first half part, and the period of the oscillation signal of the voltage controlled oscillator 36 is accelerated. Less. As shown in the latter half of FIGS. 6A and 6B, when the frequency-divided signal from the frequency divider 36d is faster than the frequency-divided signal from the frequency divider 36a and phase advance occurs, The period during which the output of the phase comparator 36b is generated becomes negative as shown in the second half of FIG. 3C, and the oscillation period of the voltage controlled oscillator 36c is delayed as shown in the second half of FIG. .

  Such control of the oscillation frequency is performed for each cycle of the frequency-divided signal of the frequency divider 36a corresponding to two cycles of the engine pulse signal. It corresponds to.

  In the above embodiment, the proximity switches 18a, 18b, 22a to 22c, 24a, and 24b are used. However, the present invention is not limited to these, and for example, an optical detector may be used. In the embodiment described above, the rotary encoder is provided in the inverter motor 8 in order to detect the rotation of the load shaft 6. However, similarly to the detection of the rotation of the engine 2, the inverter motor 8 is provided with a rotating body for detecting the rotation. The rotation of the rotating body can be detected using a proximity switch or an optical detector. In the above embodiment, one accessory device 4 is driven, but a plurality of accessory devices 4 can be controlled. In the above embodiment, the inverter motor 8 is used. However, the present invention is not limited to this, and another electric motor, for example, a DC motor can be used.

It is a block diagram of the drive device of the oil lubricator for engines of one embodiment of the present invention. It is a block diagram of the control part electronic circuit board of the drive device of the engine lubricator of FIG. It is a block diagram of the pulse multiplication part currently used for the control part electronic circuit board of FIG. FIG. 4 is a waveform diagram of each part in a state where the phases of the frequency-divided signals of the frequency dividers 36a and 36d in the pulse multiplier of FIG. FIG. 4 is a waveform diagram of each part in a state where the phases of frequency-divided signals of frequency dividers 36a and 36d in the pulse multiplier of FIG. 3 do not match.

Explanation of symbols

2 Engine 4 Attached device 6 Load shaft 8 Inverter motor (electric motor)
10 output shaft 12a 12b controller integrated inverter 16 control unit electronic circuit board (output shaft detector)
22a to 22c Proximity switch (pulse generation means)
51 Control unit

Claims (6)

In the drive device that drives the accessory device in synchronization with the rotation of the output shaft of the engine,
An output shaft detector for sending the rotational speed of the output shaft of the engine as an output shaft speed;
Connect an electric motor to the load shaft that drives the accessory device,
A load shaft detector that sends the rotation speed of the load shaft as a load shaft speed is provided in the load shaft or the electric motor,
An engine accessory having a control unit to which the load shaft speed signal and the output shaft speed are input, and controlling the electric motor so that the rotation speeds of the output shaft and the load shaft coincide with each other. Drive device.   The drive device for an engine accessory according to claim 1, wherein the output shaft detector is a pulse generating means for detecting an unevenness of a gear fixed to the output shaft of the engine and generating an engine pulse in a non-contact manner. A drive device for an engine accessory, which is connected, generates a multiplied pulse obtained by multiplying the engine pulse by a predetermined multiple, and sends the multiplied pulse as the output shaft speed signal.   3. The drive device for an engine accessory according to claim 2, wherein the output shaft generator includes a frequency divider that generates a frequency-divided pulse obtained by dividing the frequency-multiplied pulse into the predetermined multiple. A drive device for an engine accessory that compares the engine pulse and changes the multiplied pulse so that a period of the divided pulse coincides with a period of the engine pulse.   The drive device for an engine accessory according to any one of claims 1 to 3, wherein the engine is a marine engine that performs forward rotation and reverse rotation, and can be driven at a different timing from that during forward rotation during reverse rotation. A drive device for an engine accessory, wherein the load shaft is rotatable with a rotation angle shifted with respect to the output shaft.   The drive device for an engine accessory according to any one of claims 1 to 3, wherein the output shaft detector includes a rotation direction determination device that determines whether the engine is rotating forward or reverse. When the rotational direction determination unit detects that the rotational direction of the engine has changed, the drive device for an engine accessory device rotates the load shaft in the reverse direction.   2. The drive device for an engine accessory according to claim 1, wherein the load shaft is rotatable without being synchronized with the output shaft.

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