JP4989583B2 - Engine speed control method for concrete pump car - Google Patents

Description

  The present invention relates to an engine speed control method for a concrete pump car.

  In general, as shown in FIG. 5, a concrete pump truck has a deck frame 2 mounted on a chassis frame 1 and sucks and discharges concrete in the hopper 3 to the rear end side of the deck frame 2. A concrete pump 4 to be operated is mounted, a swivel base 6 is installed at the center of the front end of the deck frame 2 in the vehicle width direction, and a swivel base 7 is rotatably mounted on the swivel base 6. The base end of the lowermost boom 5 of the multi-stage boom 5 that is foldably connected to the upper end of the boom 7 is attached in a undulating manner, and further, a concrete transport pipe that is piped along the boom 5 of each stage 8 is connected to the concrete pump 4, and the concrete pumped by the concrete pump 4 is passed through the concrete transport pipe 8, from the tip hose of the concrete transport pipe 8. Out to be so that the it is possible to perform the pouring of concrete.

  On the other hand, the concrete pump 4 is driven via a switch 11 by an engine 10 electronically controlled by a computer 9 as shown in FIG. The controller 12 is connected to control the engine speed by changing. When the concrete is placed, when the operator operates the transmitter 13 for radio control, the signal is received by the commander 14, The output voltage output from the controller 12 is changed according to the signal received by the commander 14, the engine speed is electronically controlled by the computer 9, and the concrete pump 4 is driven. In FIG. 6, reference numeral 15 denotes a drive wheel of a concrete pump car. When traveling, the switch 11 is switched to the drive wheel 15, and the drive wheel 15 is driven by the engine 10 via the switch 11. It is like that.

  Here, an example of a change in the engine rotation speed when the concrete pump 4 is operated / stopped is shown in FIG. 7, for example. In this case, the engine rotation speed from the idling rotation speed N0 to the minimum rotation speed N1 at the time of operation is shown. Engine start speed and engine restart speed within the operating range of the operator (that is, between the minimum rotation speed N1 during operation and the maximum rotation speed N2 during operation) while the concrete pump 4 is operating. The operator operation range increase rate is set to be equal to each other as shown in FIG. It should be noted that the absolute value of the change rate of decrease in the operator operation range of the engine rotation speed between the minimum rotation speed N1 during operation and the maximum rotation speed N2 during operation during operation of the concrete pump 4 is the absolute value of the increase change rate of the operator operation range. It is set to be the same as the value.

  In the case of the concrete pump car, in order to reduce fuel consumption, when the concrete pump 4 is stopped, the engine rotation speed is automatically lowered to the idling rotation speed N0 and waits. The concrete pump 4 is automatically raised to the pre-stop rotational speed N1 ′.

For example, Patent Document 1 shows a general technical level related to the concrete pump vehicle as described above.
JP 2002-276542 A

  However, in the case of the concrete pump vehicle as described above, if the pumping load is large at the start or restart of the concrete pump 4, the increase in the engine rotation speed cannot catch up with the pumping load of the concrete pump 4, and the engine 10. Sometimes stopped.

  Moreover, at present, the operation of the concrete pump 4 in the concrete pump truck is mainly performed by radio control using the transmitter 13, and the operator is working at the tip of the boom 5 of the concrete pump truck. When the engine 10 stops at the construction site or the like as described above, it is necessary to return to the cab of the concrete pump car and restart the engine 10 each time, and the work efficiency becomes very bad. Had.

  For this reason, in order to avoid the engine 10 from stopping as described above, for example, as shown in FIGS. 9 and 10, start-up of the engine rotation speed from the idling rotation speed N0 to the lowest rotation speed N1 during work is started. Although it is possible to increase the time rise change rate and the restart time rise change rate, in this way, the operator operation range increase change rate of the engine rotation speed within the operator operation range also increases, and the concrete pump 4 Even if the discharge amount is slightly increased, the discharge amount of the concrete pump 4 jumps against the operator's will, and it is difficult to finely adjust the discharge amount, and the operability may be deteriorated. Since it becomes difficult to operate at the optimum engine speed, fuel consumption increases, which may lead to deterioration of fuel consumption.

  Further, when the engine start speed increase rate of change from the idling speed N0 to the minimum speed N1 at the time of start-up and the increase rate of change at the time of restart are increased, an operator operation of the engine speed within the operator operation range is performed. Even if the absolute value of the range lowering change rate is increased and the discharge amount of the concrete pump 4 is slightly reduced, the discharge amount of the concrete pump 4 is sharply lowered against the intention of the operator, and the fine adjustment of the discharge amount is possible. There is a risk that the operability will be poor.

  In view of such circumstances, the present invention can avoid engine stop even when the pumping load is large at the start or restart of the concrete pump, and can improve work efficiency and operability. It is an object of the present invention to provide a method for controlling the engine speed of a concrete pump vehicle that can also improve fuel efficiency.

In the present invention, when the concrete pump is started from a stopped state and the engine rotational speed is increased from the idling rotational speed to the minimum working rotational speed, the rate of change at the start of startup is the case where the pumping load of the concrete pump is large. Even if the engine does not stop,
Starting the start of the absolute value of the rate of change in the operator operation range and the rate of change in the range of the operator operation range between the minimum rotational speed during work and the maximum rotational speed during work during the concrete pump operation, respectively. The present invention relates to an engine rotational speed control method for a concrete pump car characterized in that it is set smaller than the absolute value of the hourly change rate.

  According to the above means, the following operation can be obtained.

  If configured as described above, since the rate of change in increase at the start of startup is set large, even if the pumping load is large at the start of startup of the concrete pump, the engine speed increases with respect to the pumping load of the concrete pump. You can avoid catching up and there is no worry of the engine stopping.

  For this reason, in the construction site of a high-rise building, the operation of the concrete pump truck is performed when the operator is operating the concrete pump in the concrete pump truck at the tip of the boom of the concrete pump truck by radio control using a transmitter. It is not necessary to return to the room and restart the engine, so that the work efficiency can be improved.

  On the other hand, the absolute value of the operator operation range increase change rate and the absolute value of the operator operation range decrease change rate of the engine rotation speed between the minimum rotation speed at work and the maximum rotation speed at work during operation of the concrete pump, respectively, Since it is set smaller than the absolute value of the rate of change at start-up, when the concrete pump discharge rate is slightly increased or decreased slightly, the concrete pump discharge rate is determined by the operator. On the other hand, it does not jump up or drop sharply, making it easy to finely adjust the discharge amount, improving operability, and enabling operation at the optimum engine speed, reducing waste of fuel consumption. This will also lead to improved fuel economy.

  In the engine speed control method of the concrete pump vehicle, the rate of change at the time of restart when the concrete pump is restarted from a stopped state and the engine speed is automatically increased from the idling speed to the pre-stop speed is determined. , It can be made equal to the rate of change at the start of startup.

  In the method of controlling the engine speed of the concrete pump vehicle, when the concrete pump is restarted from the stopped state and the engine speed is automatically increased from the idling speed to the pre-stop speed, the work starts from the idling speed. The rate of change in engine speed up to the lowest engine speed at restart is equal to the rate of change in engine startup at startup, and the engine speed from the lowest engine speed to the highest engine speed is increased at restart. The rate of change can be made equal to the rate of change of the operator operation range.

  According to the engine rotational speed control method of the concrete pump vehicle of the present invention, even when the pumping load is large at the start or restart of the concrete pump, the engine stop can be avoided, and the working efficiency and the operability are improved. In addition, an excellent effect of improving fuel efficiency can be achieved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 and 2 show an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 5 to 10 denote the same components, and the basic configuration is as shown in FIGS. 10 is the same as the conventional one shown in FIG. 10, but the feature of this example is that, as shown in FIGS. 1 and 2, the concrete pump 4 is started from a stopped state, and the engine rotational speed is set to the idling rotational speed. The rate of change at start-up when increasing from N0 to the minimum rotation speed N1 during work is the rate at which the engine does not stop even when the pumping load of the concrete pump 4 is large. The absolute value of the increase rate of change in the operator operation range and the decrease rate of change in the operator operation range between the minimum rotation speed N1 and the maximum rotation speed N2 during operation are respectively shown Lies in the set to be smaller than the absolute value of the activation start time of increasing rate of change.

  In the case of this illustrated example, when the concrete pump 4 is restarted from a stopped state, and the engine rotational speed is automatically increased from the idling rotational speed N0 to the pre-stop rotational speed N1 ′, It is equal to the rate of change at the start of startup.

  It should be noted that the rate of change at the time of restart can be appropriately changed by switching a switch (not shown) according to the preference of the operator. For example, the concrete pump 4 is restarted from a stopped state as shown in FIGS. When the engine rotational speed is automatically increased from the idling rotational speed N0 to the pre-stop rotational speed N1 ′, the rate of increase change at restart of the engine rotational speed from the idling rotational speed N0 to the lowest rotational speed N1 during work It is also possible to equalize the rate of change at the start of startup and to make the rate of change at startup of the engine speed from the minimum rotational speed N1 during work to the maximum rotational speed N2 during work equal to the above-mentioned percentage change in operator operation range. It is.

  On the other hand, as shown by the phantom lines in FIG. 2 and FIG. 4, the operator operation range increase rate can be adjusted as appropriate according to the operator's preference. It can be adjusted as appropriate according to the conditions.

2 and 4, the rotation speed N1 ′ before stop is
N0 <N1 ′ <N2
However, as shown at the end of the diagrams of FIGS. 1 and 3, when the operation of the concrete pump 4 is stopped at the maximum working speed N2,
N1 '= N2
At the subsequent restart, the engine speed automatically increases from the idling rotational speed N0 to the pre-stop rotational speed N1 ′, that is, the maximum working rotational speed N2.

  Next, the operation of the illustrated example will be described.

  When configured as described above, since the rate of change at startup start and the rate of change at startup restart are set large, even if the pumping load is large when the concrete pump 4 is started or restarted, the concrete pump Therefore, it is possible to avoid an increase in the engine rotational speed from catching up with the pressure feeding load of 4, and there is no fear that the engine 10 stops.

  For this reason, in the construction site of a high-rise building or the like, when the operator performs the operation of the concrete pump 4 in the concrete pump vehicle by the wireless operation using the transmitter 13 at the tip of the boom 5 of the concrete pump vehicle. It is not necessary to return to the driver's cab and restart the engine 10, thereby improving work efficiency.

  On the other hand, the absolute value of the change rate of increase in the operator operation range and the decrease rate of change in the operator operation range between the minimum rotation speed N1 during operation and the maximum rotation speed N2 during operation during operation of the concrete pump 4 are obtained. Each of these is set to be smaller than the absolute value of the rate of change at the start of starting, so that when the discharge rate of the concrete pump 4 is slightly increased or decreased, the discharge rate of the concrete pump 4 is increased. However, it does not spring up or drop sharply against the operator's will, making it easy to fine-tune the discharge amount, improving operability, and enabling operation at the optimum engine speed. This will reduce waste and lead to improved fuel efficiency.

  In this way, even when the pumping load is large at the start or restart of the concrete pump 4, it is possible to avoid stopping the engine 10, improve work efficiency and operability, and further improve fuel efficiency. obtain.

  In addition, the engine rotational speed control method of the concrete pump vehicle of this invention is not limited only to the above-mentioned illustration example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

It is a diagram which shows an example of the form which implements this invention. FIG. 2 is a diagram showing an increase rate of change in engine speed at restart in the example of FIG. 1. It is a diagram which shows the example which changed the raise change rate at the time of restart in an example of embodiment which implements this invention. FIG. 4 is a diagram showing an increase rate of change in engine rotation speed upon restart in the example of FIG. 3. It is a side view which shows an example of a concrete pump truck. It is a block diagram which shows the drive system and control system of a concrete pump. It is a diagram which shows an example of the change of the conventional engine speed at the time of a driving | operation / stop of a concrete pump. FIG. 8 is a diagram showing an increase rate of change in engine rotation speed at the start of startup, an increase rate of change in restart, and an increase rate of change in operator operation range in the example of FIG. 7. In an example of changes in engine speed during operation / stop of a concrete pump, the increase rate at start-up and the rate of change at start-up of engine speed from the idling speed to the minimum speed at work are increased. FIG. FIG. 10 is a diagram illustrating an increase rate of change in engine rotation speed at the start of startup, an increase rate of change in restart, and an increase rate of change in operator operation range in the example of FIG. 9.

Explanation of symbols

4 Concrete pump 5 Boom 6 Swivel base 7 Swivel base 8 Concrete transport pipe 10 Engine 11 Switch 12 Controller 13 Transmitter 14 Commander N0 Idling rotational speed N1 Minimum rotational speed during operation N1 'Pre-stop rotational speed N2 Maximum rotational speed during operation speed

Claims (3)

When the concrete pump is started from a stopped state and the engine rotation speed is increased from the idling rotation speed to the minimum rotation speed during work, the rate of change at the start of startup is calculated even when the pump load of the concrete pump is large. Let the rate of change not stop,
Starting the start of the absolute value of the rate of change in the operator operation range and the rate of change in the range of the operator operation range between the minimum rotational speed during work and the maximum rotational speed during work during the concrete pump operation, respectively. An engine rotational speed control method for a concrete pump car, characterized in that it is set smaller than the absolute value of the hourly rate of change.   The restart change rate at the time of restart when the concrete pump is restarted from the stopped state and the engine speed is automatically increased from the idling speed to the pre-stop speed is equal to the above-mentioned start change rate. The engine speed control method of a concrete pump car according to 1.   When the concrete pump is restarted from the stopped state and the engine speed is automatically increased from the idling speed to the pre-stop speed, the engine speed increases from the idling speed to the minimum speed during work. The rate of change at the start of startup is equal to the rate of change at startup, and the rate of change at startup of the engine speed from the lowest rotational speed at work to the highest rotational speed at work is equal to the rate of change of increase in operator operation range. The engine speed control method of a concrete pump car according to 1.

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