KR100292235B1 - Rpm-indicating device for working vehicle - Google Patents

Abstract

In the rotation speed display device of the work machine, the relationship between the engine speed and the movement amount of the indicating portion 17a of the rotation speed display means 17 is set nonlinearly, and more specifically, in the high rotation area F for the work. The display precision per unit rotational speed of the indicating unit 17a is set to be higher than the display accuracy in the rotational speed indicating region below the high rotational region F. Accordingly, the operator can easily check the rotational speed fluctuation when viewed visually, and it is possible to easily fine-tune the engine speed in the commercially available high rotational area (F).

Description

RPM-INDICATING DEVICE FOR WORKING VEHICLE}

The present invention relates to a display device for engine speed in a work machine such as a combine or a tractor. In more detail, this invention relates to the technique for making it easy to perform operation which sets an engine speed in the high rotational area for work | work or the rated rotational area set in it by looking at a display apparatus.

In the work machine, the engine rotational speed is usually set to a high rotational region (hereinafter referred to as a "working high rotational region") suitable for work, which is an area near the highest rotational speed among the allowable rotational speed regions. It is a common use method that the engine speed is set to a rated rotational area that generates a rated output (usually at the highest output) even in the high rotational area for work.

In the conventional analog rotation system, the indicator hand moves so as to move along the set path in accordance with the variation of the engine speed, and the movement angle of the indicator hand changes linearly with the variation of the engine speed (two points in FIG. 3). See dashed line).

As described above, before starting work, the accelerator lever is operated while looking at the tachometer so that the engine speed is set within the rated rotation area of the high rotational area for work. The overall high rotational area for work is a relatively narrow area near the highest rotational speed, for example, in the case where the highest rotational speed is 3200 rpm, it is 2400 to 3200 rpm. Therefore, in the conventional rotational system, when the working high rotational area is about one quarter of the entire movement amount of the pointer hand, that is, the entire moving angle of the indicator hand is 120 degrees, the working high rotational area corresponds to about 30 degrees.

In this way, the display width of the commercially available high-rotational region becomes one-third of the display width of the lower-lower-side region that is not used first, and the amount of movement of the indicator hand during the operation of setting the engine speed is set. As it is small, it is difficult to see as a rotation system and at the same time, the balance is not good as a display means. Therefore, it is desired to enlarge the movement amount of the indicator hand so that it is easy to see and understand the change in the engine speed in the high rotational area for work. However, if the display width of the high rotation range is increased under the above conditions in which the movement angle of the indicator hand changes linearly with the variation of the engine speed, the display width as a whole of the rotation system increases greatly, so that the control panel is not settled. It may be inappropriate.

In addition, depending on the type of crop, the work load is lighter than usual, and the rotation speed is set slightly lower than the rated rotation range in terms of noise and fuel consumption. However, in the conventional structure, since the ratio of the display width of the work high rotation area is small, it is difficult to finely control the rotation speed, such as the rotation speed fluctuating more than the operator thought. Therefore, even in such a case, it was difficult to set and operate the engine speed while watching the rotation system.

A first object of the present invention is to provide a rotation speed display device that makes it easy to view the change in rotation speed in a high rotational area for work without increasing the display space as the rotation speed display means as a whole, and to easily set the engine rotation speed. It is.

In addition, when the operator actually sets the engine speed, the driver tends to think that the engine speed is preferably set to the median value within the rated rotation area or to the rated speed thereof. Therefore, the operator often operates the accelerator carefully while looking at the rotation system. There is no problem in operation as long as the engine speed is set within the rated rotation range. However, since the display of the rated rotation range has a certain width, the operator psychologically sets the engine rotational speed or the rated rating when setting the engine speed. It is easy to operate to match the rotational speed.

However, the center position and the rated rotational speed are unique rotational speeds, for example, 3000 RPM, and in the rotational speed display means are indicated by lines (or dots) in the rated rotational area. Therefore, even if it is relatively easy to set and operate the engine speed within the rated rotation area, the indicator indicates the engine speed fluctuation relatively faithfully, so that the indicator hand is always shaken, which is not easy to see. The indicator hand is likely to move excessively than intended. For this reason, since it is difficult to match the indicator hand to the center position of the rated rotational area or to the rated rotational speed, the operator often takes time to set the engine speed.

Therefore, another object of the present invention is to provide a rotation speed display device which can perform setting operation which is performed while watching the rotation system to the rated rotation area set in the high rotation area for work more easily than before.

In order to achieve the above object, the rotation speed display apparatus of the working machine according to the present invention is characterized by the configuration described in claim 1.

In the conventional analog rotational system, the display angle of the engine speed is set at equal angle intervals, and the moving angle of the indicator hand per unit speed is set equally. On the other hand, in this invention, the rotation speed fluctuation range in the high rotation area | region for a work of rotation speed display means expands more than before. That is, the display precision of the rotation speed is set higher in the work high rotation region than in the region less than that. For this reason, it is easy for the operator to check the rotational speed fluctuation when viewed visually, and it is possible to finely perform the rotational adjustment setting and the fine adjustment operation performed while watching the rotational speed display means in the commercially available high rotational area. At this time, since the rotation speed fluctuation range becomes less than the high rotational area for work, the amount of movement of the indicator in the high rotational area for work is enlarged and easy to see as described above, and it is not necessary to increase the amount of movement of the entire indicator. Therefore, it is possible to improve the function as the rotation speed display means while maintaining the limited installation space. That is, it is easy to visually check the rotational speed fluctuation in a commercially available high-rotation region without increasing the rotational display means, and to easily perform the rotation speed setting operation or fine adjustment while looking at the rotational speed display means. I could.

Furthermore, if the display accuracy of the unit rotational speed of the indicating unit in the rated rotational region is set lower than the display accuracy in the rotational speed indicating region below the rated rotational region in the high-rotational region, It is advantageous in the next point.

When the operator sets and operates the engine speed in the rated rotation range, the operation is usually carried out to gradually increase the engine speed from the idling side to the high rotation side. If it is smaller than the fluctuation range, the setting operation in the rated rotation area can be easily performed.

In addition, when the display width of the rated rotational area is made small (displayed by half the width or the thick line, etc.), setting operation into the rated rotational area is difficult to perform compared with the conventional art. However, since the operator only needs to set within the rated rotational area as described above, there is no mentality to set it to the center of the rated rotational area or the rated rotational speed as in the prior art. In addition, it is also mitigated that the indicator portion always fluctuates due to fluctuations in the engine speed. That is, by reducing the display width of the rated rotation area, the adjustment operation of the rotational speed is better than the conventional one, so that the setting operation becomes easy, and the time required for the setting operation is also shortened.

Therefore, in view of the ergonomics of the operator, by making the display width of the rated rotational area in the rotational speed display means smaller than before, it becomes easier for the operator to match the engine speed to the rated rotational area. The setting operation can be performed quickly.

As described above, the non-linear relationship between the engine speed and the movement amount of the indicator needle makes the rated speed display device easy to visually check and fine-tune the setting operation to the high rotational area for operation. It is possible to quickly set the rotation area, and even if there is a rotation area higher than the rated rotation area, the rotation speed setting operation can be easily performed while looking at the rotation speed display means, making it suitable for use in accordance with the actual situation. Can

Other objects, actions, effects, and features of the present invention will become apparent by reading the following description.

1 is a side view of a combine showing as an example of a work machine employing the rotation display device of FIG. 4 according to the present invention;

FIG. 2 is a plan view of a control unit of the combine of FIG. 1; FIG.

3 is a diagram showing the relationship between the engine speed and the declination angle (movement amount) of the tachometer indicator hand;

4 is a plan view showing a rotation speed display device;

5 is a block diagram showing a rotation system operating means by a dynamometer power generation signal;

6 to 10 are diagrams showing a graph different from FIG. 3 showing another relationship between the engine speed and the declination angle of the tachometer indicator hand;

(Explanation of symbols for the main parts of the drawing)

17: tachometer 17a: indicating means

F: High rotational area for work d: Rated rotational area

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described, referring an accompanying drawing. Hereinafter, it demonstrates using a combine as an example of a working machine.

In the combine shown in FIG. 1, 1 is a harvesting | reaping part, 2 is a control part, 3 is a crawler traveling apparatus, 4 is a threshing apparatus, 5 is an engine, and 6 is a transmission. As shown in Figs. 1 and 2, the steering unit 2 includes a steering lever 8, an instrument 9, these steering levers 8, and an instrument in which the steering direction of the aircraft and the lifting and lowering of the harvesting unit 1 are carried out. It consists of the control tower 10 provided with the apparatus 9, the driver's seat 11, the operation box 12 arrange | positioned at the left side of the driver's seat 11, the floor step 13, etc.

As shown in FIG. 4, the meter apparatus 9 is provided with the rotation system (an example of rotation speed display means) 17 which displays the engine speed analog. That is, it is comprised so that the indicator needle (an example of the instruction | indication part) 17a which instruct | indicates the detected engine speed will move along a setting path (in this case, circular arc trace) according to a change of engine speed.

F is an area near the highest rotational speed among the allowable rotational speed regions of the indicator needle 17a, and indicates a high rotational speed suitable for work, and this region is referred to as a high rotational speed for work. The angular range of the work high rotation region F is composed of an appropriate rotation region a, an attention rotation region b which is a light load rotation region, and an alarm rotation region c which is a limit rotation region. In the proper rotation area a of the high rotational area F for work, d denotes a rated rotation area. The engine speed is usually set in the rated rotation area d in which the engine speed generates the rated output (usually often the highest output).

The rotation speed of the engine 5 is set by the hand accelerator 7 (FIGS. 1 and 2) provided in the control part 2. As shown in FIG. This setting is made by, for example, interlocking the hand accelerator lever 7 with a governor lever (not shown) of the engine 5 via a wire (not shown).

In the rotation system 17 of the meter apparatus 9, the moving angle (an example of the amount of movement) of the indicator needle 17a per unit rotation speed in the high rotation area | region F for work | work is more than the moving angle in less than the high rotation area | region F for work | work. It is set to be large.

That is, the angle range of the high-speed rotation region F for work is converted to be larger than the arithmetic ratio with respect to the total rotation region of the engine speed. The engine speed is displayed on the rotation system 17 via the control device 43 (FIG. 5) which performs such a conversion.

For example, if the maximum rotational speed is 3200 rpm and the work high rotation region F is 2400 rpm to 3200 rpm, the calculation ratio for the entire rotation region of the work high rotation region F is (3200-2400) / 3200 = 1/4 = 25%. If the total moving angle of the indicator needle 17a is 100 degrees, the display angle of the conventional high rotational area F for work is 25 degrees. In the present invention, on the other hand, under the above conditions, the display angle of the high rotational area F for work is enlarged to about 45 degrees by the electrical processing in the control device 43, so that the tachometer 17 is visually visible. It is easy to use for example.

That is, regarding the display precision of the indicator needle 17a, the work high rotation area | region F is set more accurately than less than the work high rotation area | region F. As shown in FIG.

As shown in FIG. 5, the power generation frequency (pulse signal) in the dynamometer 41 is detected by the frequency detector 42, and the control device 43 rotates the rotation system based on the detection information of the frequency detector 42. Move (17). That is, one rotation of the engine 5 (output shaft of the engine) is detected as corresponding to one cycle of AC power from the dynamometer 41, and this detection information is controlled by the control device 43 through the frequency detector 42. Is entered. Thereafter, the movement angle of the indicator needle 17a is controlled by the electrical processing in the control device 43. As a result, the unit in the rated rotation area d existing in the working high rotation area F is set so that the movement amount of the indicator needle 17a per unit revolution is smaller than that for the high rotation area F for work. The amount of movement of the rotational speed indicator needle 17a is set so as to be smaller than that of the portion excluding the rated rotational area d in the work high rotational area F. FIG.

In other words, the rated rotation area d is smaller in the ratio of the display angle than the high rotation area F for the work in which the display angle is expanded. In such a configuration, the operation of setting the engine speed in the rated rotational area d is slightly difficult compared to the conventional one, but is easier to match than to match the rated speed. That is, the operator only needs to adjust the engine speed within the rated rotation area d, so that the setting operation of the rotation speed can be easily and quickly performed.

In other words, in the working high rotational region F, the movement amount of the indicator needle 17a per unit operation amount of the accelerator lever 7 is large, and the sensitivity of the rotation system 17 is relatively sensitive, but in the rated rotational region d, The movement amount of the indicator needle 17a per unit operation amount of the accelerator lever 7 is small, and the sensitivity of the rotation system 17 is relatively insensitive or gentle.

That is, in the display area of the work high rotation area F, the rated rotation area d is set at a lower (rougher) accuracy than the area less than that of the display precision of the indicator needle 17a.

For reference, the relationship between the engine speed of the tachometer 17 and the declination angle of the indicator hand is indicated by a solid line in the graph of FIG. 3. From this graph, the work high rotation region F, which is a relatively narrow rotation region of the entire engine speed, is enlarged so that the declination angle of the indicator needle 17a is relatively large, and the rated rotation region while in the enlarged rotation region. It is read that the declination angle of the indicator needle 17a corresponding to (d) is narrowed inversely. In addition, from the graph of FIG. 3, the amount of movement of the indicator needle 17a per unit rotation speed in the rated rotation area d is larger than the movement amount of the indicator needle 17a in the rotation area below the high rotational area F for work. It can also be read.

Therefore, in the high rotational area F for work, the indication of the engine speed change with respect to the front and rear swing of the hand accelerator 7 is basically smooth, and fine adjustment of the rotation speed is easy. In the rated rotational area d, the change in the engine speed with respect to the forward and backward fluctuations of the hand accelerator 7 becomes relatively sensitive, and although the set of the engine speed to the rotational area d is slightly difficult, The rated speed itself is almost accurate.

As shown in FIG. 4, in the high rotation area | region F for work of the tachometer 17, the display part 38 of the appropriate rotation area | region a turns green, and the display part 39 of the attention rotation area | region b turns yellow. In addition, the display unit 40 of the alarm rotation area c is colored in red and classified into colors, so that the user can quickly recognize whether the engine speed is appropriate. In addition, when the display portion 38a of the rated rotation region d in the proper rotation region a is colored in a different color such as blue, it becomes easier to recognize and improves the convenience. In addition, a load warning light 37 and an alarm buzzer (not shown) are provided, and when the indicator needle 17a is in the attention rotation area b, the load warning light 37 is turned on and the alarm rotation area c is turned on. When there is, the load warning light 37 is turned on and the alarm buzzer sounds to make it easier for the operator to realize the abnormality of the load.

In addition, in the instrument device 9 of FIG. 4, 29 is a clogging warning light, 30 is a cutter clogging warning light, 31 is a winger lamp, 32 is a water temperature warning light, 33 is an oil warning light, 34 is a charging warning light, and 35 is a working machine. A meter indicating cumulative operating time, 36 is a fuel remaining indicator.

(Other embodiment)

The relationship between the engine speed and the declination angle of the tachometer indicator hand at the time of processing by the control apparatus 43 is not limited to the pattern of the graph shown by the solid line in FIG. In addition, you may make it the relationship similar to the graph shown in FIGS. 6-10, for example.

In FIG. 6, the relationship between the rotation speed of the engine 5 and the declination angle of the indicator needle of the rotation system 17 becomes a graph of the substantially circular arc which expanded downward. In other words, FIG. 6 is a non-linear graph that increases the declination of the indicator needle 17a as the engine speed increases, and increases the declination of the indicator needle 17a in the high rotational area F for operation to view the rotation system 17. It's easy. In the rated rotation region d, however, the declination angle of the indicator needle 17a is reduced, and the setting accuracy of the rated rotation speed is increased.

As shown in FIG. 7, the movement amount of the indicator needle 17a per unit rotation speed in the rotation system 17 is made larger in the working high rotation region F than in the region below the working high rotation region F, It may be set so that it becomes a one-fold folded graph which becomes convex downward. This gives only high and low display accuracy only with respect to the relationship between the work high rotational area F and the parts below it, and in the work high rotational area F, between the rated rotational area d and the display area smaller than that. This is an example of not adding high and low precision.

As shown in Fig. 8, the amount of movement of the indicator needle 17a per unit rotation speed in the rotation system 17 is basically changed linearly, except that the rated rotation area existing in the working high rotation area F ( The thing of d) may be set so that it may become a 1-stage folding graph which becomes convex upward and becomes smaller than the thing of less than that part. This is an example in which the display precision is high and low only with respect to the relationship between the rated rotation region d and the less than that in the high rotation region F for work. The inclination of the graph in the region below the rated rotation region d may be steeper or gentler than that shown in FIG.

As shown by the solid line in FIG. 9, the amount of movement of the unit rotational permissible indicator needle 17a in the rotation system 17 becomes larger in the work high rotation region F than in the region below the work rotation region F. Also, the working high rotation region F is smaller than that of the rated rotation region d existing in the working high rotation region F so as to be smaller than the lower than the rated rotation region d in the working high rotation region F. It is also possible to set so that the two or more graphs of the rated rotation area d and the ones of the rated rotation area d in () are the same and become a two-stage folding graph.

In addition, as shown in FIG. 10, the amount of movement of the indicator needle 17a per unit rotation speed in the rotation system 17 is larger than that of the region below the high rotation region F for work, and the higher rotation region F for operation. Also, the working high rotation region F is smaller than that of the rated rotation region d existing in the high rotation region F for work so as to be smaller than the less than the rated rotation region d in the high rotation F for work. It may be set so that more than the rated rotation area d in the smaller than that of the rated rotation area d. In other words, it is shown as a threefold graph.

In addition, in the Example demonstrated above, the engine speed is displayed by analog type. In the case where the rotation speed display device according to the present invention is employed in a digital display device, for example, in the work high rotation area F, the rotation speeds are relatively high by 3 rpm, 1101, 3199, 3200, and 1 rpm. In the display precision, the display area can be set to display with a low (rough) display accuracy at 10 rpm.

As already mentioned, the rotation speed of the engine 5 is set by the hand accelerator 7 provided in the control part 2, and this setting is made, for example, by using the governor lever (the engine) of the engine. (Not shown) to interlock with a wire (not shown). At this time, the relationship between the unit operation amount of the hand accelerator 7 and the variation amount of the engine speed may be made non-linear. For example, the amount of change in the engine speed with respect to the unit operation amount of the hand accelerator 7 in the work high rotation region F is converted into the unit operation amount of the hand accelerator 7 in the region below the work high rotation region. It may be smaller than the fluctuation amount of the engine speed.

In addition, the operation amount of the hand accelerator 7 may be converted into an electric signal by a potentiometer or the like and subjected to an accelerator operation by an actuator such as an electric motor, and the configuration of the rotation speed display device of the present invention may be shown by a control circuit. .

In addition, the analog display type rotation system 17 which moves the instruction | indication part which instruct | indicates the detected engine rotation speed along a setting path with the variation of engine rotation speed is not limited to the structure which has the instruction needle 17a. For example, the rotation system 17 of the structure where a light-emitting diode (LED) expands and contracts in a bar graph shape may be used. In this case, the blinking change length of the LED may be set to be longer in the high rotation region than in the low rotation region and shorter in the rated rotation region d.

Claims (3)

A rotation speed display device of a work machine having a rotation speed display means (17), In the rotation speed display device provided with the instruction | indication part 17a which instruct | indicates the engine speed which this rotation speed display means 17 detected, The indicating portion 17a is configured to be movable along a setting path having a high rotational area F for work and a low rotational side area for indicating an engine speed smaller than the engine speed in the high rotational area F for work. Since the movement amount per unit rotational speed of the instruction portion 17a in the work high rotation region F in the set path is set to be larger than the movement amount in the low rotation side region, the instruction portion in the work high rotation region F ( The rotational speed display apparatus of the working machine characterized by setting so that the display precision per unit rotation speed of 17a) may be higher than the display precision in the said low rotation side area | region. The display precision according to claim 1, wherein the display accuracy of the unit rotational speed of the indicating portion 17a in the rated rotation area d is higher than the rated rotation area d. The rotation speed display apparatus of the working machine characterized by being set so that it may become lower than precision. The movement amount per unit rotational speed of the said indication part 17a in the rated rotation area | region d of the said high rotation area | region F for work is set so that it may become smaller than the movement amount in the area | region below the rated rotation area | region d. Rotation speed display device of the work machine.