JP2004100647A - Construction machine and its display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to always display an accurate engine oil pressure meter display without being influenced by an engine speed. <P>SOLUTION: The construction machine and its display device is equipped with: an oil pump for force feeding engine oil to each part of an engine by discharge pressure dependent on the engine speed; the engine oil pressure meter 50 for displaying an engine oil pressure range composed of a normal range and an abnormal range for reporting the engine oil pressure by indicating one of the engine oil pressure ranges by an indication means; a pressure sensor 2 for detecting engine oil pressure; and a speed sensor 3 for detecting engine speed. The indicating means is controlled by the engine oil pressure meter 50 according to the detecting output of the pressure sensor 2, and the ratio accounting for the abnormal range of the engine oil pressure range is changed according to the detection output of the speed sensor 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a construction machine such as a hydraulic shovel provided with an engine oil pressure meter and a display device of the construction machine.
[0002]
[Prior art]
It has an oil pump for supplying engine oil to each part of the engine, and a hydraulic sensor that turns on and off according to the engine oil pressure. Based on the state of this oil pressure sensor, when the engine oil pressure falls below a predetermined value, An abnormality detection device that issues an abnormality alarm is known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 2571301 (FIG. 2)
[0004]
[Problems to be solved by the invention]
Since the discharge pressure of the oil pump provided in the engine depends on the engine speed, when the engine speed is high, even if the engine is in an abnormal state (for example, the oil amount is less than a predetermined value), the engine oil pressure increases to a certain degree. For this reason, in the oil pressure abnormality detection, when the engine speed is higher than a certain level, the abnormality may not be detected in spite of the abnormality. The same applies to the case where the engine oil pressure is displayed on the engine oil pressure meter. In some cases, the indicator does not indicate the red zone in spite of the abnormal state.
[0005]
An object of the present invention is to provide a construction machine capable of always displaying an accurate engine oil pressure meter regardless of the level of the engine speed and a display device therefor.
[0006]
[Means for Solving the Problems]
The construction machine according to the present invention displays an oil pump that pumps engine oil to each part of the engine at a discharge pressure that depends on the engine speed, and an engine oil pressure range that includes a normal region and an abnormal region. , An engine oil pressure meter for notifying engine oil pressure by instructing any one of the above with an instruction means, a pressure sensor for detecting engine oil pressure, and a first control for controlling the instruction means based on a detection output of the pressure sensor. Device, a rotation speed sensor for detecting an engine rotation speed, and a second control device for changing a ratio of the abnormal region occupying the engine oil pressure range based on a detection output of the rotation speed sensor. Solve the problem.
The invention according to claim 2 further includes a temperature sensor for detecting the engine oil temperature, and changes the ratio of the abnormal region based on the detection output of the rotation speed sensor and the detection output of the temperature sensor.
The display device for a construction machine according to the third aspect of the present invention displays the engine oil pressure range including a normal region and an abnormal region, and indicates the engine oil pressure by indicating one of the engine oil pressure ranges with the indicating means. An engine oil pressure meter for notifying and a display control device for controlling the indicating means in accordance with the engine oil pressure and changing the ratio of the abnormal region in the engine oil pressure range in accordance with the engine speed. .
According to a fourth aspect of the present invention, there is provided an engine oil pressure meter which displays an engine oil pressure range including a normal region and an abnormal region, and notifies the engine oil pressure by instructing one of the engine oil pressure ranges by an instruction means. It is applied to the display device of the construction machine to be controlled. Then, the higher the engine oil pressure, the higher the engine oil pressure, the higher the rotational speed, the higher the ratio of the abnormal region in the engine oil pressure range becomes. A signal output device for outputting a second display signal, a display control device for controlling the indicating means based on the first display signal, and performing a display control of an engine oil pressure range in accordance with the second display signal. Is provided.
A construction machine according to a fifth aspect of the present invention displays an oil pump for pumping engine oil to each part of the engine at a discharge pressure depending on the engine speed, and an engine oil pressure range including a normal region and an abnormal region, and displays an engine oil pressure range. An engine oil pressure meter for notifying engine oil pressure by instructing one of the oil pressure ranges by an instruction means, a pressure sensor for detecting engine oil pressure, a rotation speed sensor for detecting engine speed, and a pressure sensor. A control device for determining a pointing position of the pointing means by adding a detection output of the rotation speed sensor to the detection output, and controlling the pointing means to point to the determined pointing position.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram illustrating an engine lubrication system of a construction machine according to the present embodiment. When the engine 10 is started, the oil pump 11 is driven, and the engine oil sucked up from the oil pan 12 is filtered by an oil filter 13 and then filtered to various parts of the engine (for example, the cylinder head 14 and other sliding parts and rotating parts). ) To contribute to the lubrication and cooling of each part. The oil that has passed through each part returns to the oil pan 12. The pressure sensor 2 detects the discharge pressure of the oil pump 11 (secondary pressure of the oil filter 13) as engine oil pressure. The rotation speed sensor 3 detects the rotation of the engine output shaft 15 as the engine rotation speed. The temperature sensor 4 detects an oil temperature in the oil pan 12.
[0008]
The outputs of the sensors 2 to 4 are input to a microcomputer (hereinafter referred to as a microcomputer) 20 shown in FIG. The microcomputer 20 has a CPU 21 and a memory 22, and a display control circuit 30 and a warning control circuit 40 are connected to output ports.
[0009]
The display control circuit 30 controls the driving of the engine oil pressure meter 50. The engine oil pressure meter 50 is provided in the driver's seat of the construction machine, and for example, as shown in FIG. And a pointer 52 for notifying the user. The zone portion 51 includes a normal region 51a indicating a normal pressure range and an abnormal region 51b indicating an abnormal pressure range (low pressure range). The abnormal region 51b is generally called a red zone, and is hereinafter referred to as a red zone. The engine oil pressure meter 50 of the present embodiment is constituted by a liquid crystal display device, and both the zone portion 51 and the pointer 52 are liquid crystal displayed. The display control circuit 30 includes a zone control unit 31 that controls display of the zone unit 51 and a pointer control unit 32 that controls display of the hands 52.
[0010]
The warning control circuit 40 is connected with an indicator light 61 and a buzzer 62 as a warning device. These warning devices are activated when the engine oil pressure falls below a predetermined value.
[0011]
The display control of the engine oil pressure meter 50 described above will be described in detail.
A map M1 as shown in FIG. 4 is stored in the memory 22 of the microcomputer 20 in advance. This map M1 is obtained by associating the deflection angle (here, the angle in the clockwise direction) θ of the pointer 52 with the engine oil pressure, and the deflection angle basically increases linearly with an increase in the engine oil pressure. It is supposed to. The CPU 21 of the microcomputer 20 obtains the deflection angle θ of the pointer 52 from the map M1 based on the engine oil pressure, which is the detection output of the pressure sensor 2, and outputs it to the display control circuit 30. The pointer control unit 32 of the display control circuit 30 controls the display of the pointer 52 based on the input shake angle θ.
[0012]
According to the above-described pointer control, when the engine oil pressure decreases due to, for example, a decrease in the engine oil amount or clogging of the filter, the deflection angle θ of the pointer 52 decreases. Indicates the red zone 51b. In such a state, the engine oil may not be sufficiently distributed to a necessary place, which may hinder the driving of the engine. Then, when the operator confirms that the pointer 52 has approached the red zone to some extent, the operator performs maintenance such as oil replenishment.
[0013]
By the way, since the discharge pressure of the oil pump 11 in the engine depends on the engine speed, when the engine speed is high, even if the engine is in an abnormal state (for example, the oil amount is less than a predetermined value), the engine oil pressure increases to some extent. For this reason, with only the above-mentioned pointer control, there is a possibility that the pointer 52 does not indicate the red zone 51b in spite of the abnormality when the engine speed is high. In order to prevent this, in the present embodiment, the ratio occupied by the red zone 51b in the zone portion 51, in other words, the ratio between the red zone 51b and the normal region 51a is changed according to the engine speed.
[0014]
That is, the map M2 for determining the red zone range shown in FIG. 5 is stored in the memory 22 of the microcomputer 20 in advance. The map M2 associates the red zone range E1 with the engine speed. Basically, the higher the engine speed, the larger the proportion of the red zone range. The CPU 21 obtains the red zone range E1 from the map M2 based on the engine speed, which is the detection output of the speed sensor 3, and outputs it to the display control circuit 30. The zone control unit 31 of the display control circuit 30 controls the display of the zone unit 51 based on the input red zone range E1, and changes the ratio of the red zone 51b. Here, since the engine oil pressure meter 50 is formed of a liquid crystal display device as described above, the display of the zone 51 can be easily changed.
[0015]
FIG. 6 shows an example of a processing procedure for realizing the above operation in a software manner, which is executed by the CPU 21 of the microcomputer 20 and the display control circuit 30. FIGS. 3A to 3C show display examples of the engine oil pressure meter 50 under the control, and show display states when the engine speed is 750 rpm, 1500 rpm, and 2000 rpm, respectively. As can be seen from FIG. 3, the higher the engine speed, the greater the proportion of the red zone 51b occupied. For the same pointer swing angle θ (same engine oil pressure), the red zone in FIGS. Is not indicated, but the red zone is indicated in FIG. This indicates that the oil pressure when the engine speed is 750 rpm and 1500 rpm is not a certain value P if the value is a certain value P, but that the oil pressure is abnormal if the value is 2000 rpm even at the same pressure P.
[0016]
As described above, according to the present embodiment, since the red zone range is changed based on the engine speed, an accurate engine oil pressure display is always performed regardless of the engine speed. Be instructed. Therefore, the inconvenience of missing the maintenance time of the engine oil is eliminated.
[0017]
Although not shown in FIG. 6, the CPU 21 also performs a warning control based on the output of the pressure sensor 2 and the output of the rotation speed sensor 3. That is, the presence or absence of the necessity of a warning is determined based on the outputs of the two sensors 2 and 3, and when it is determined that the warning is necessary, the indicator light 61 and the buzzer 62 are operated via the warning control circuit 40. A warning is issued when the pointer 52 of the engine oil pressure meter 50 points to the red zone 51b, and no warning is generated when the pointer 52 points to the normal region 51a. There is no inconvenience that the red zone 51b is not instructed even though the warning has occurred.
[0018]
Another embodiment will be described with reference to FIGS. 7 and 8.
In the present embodiment, the red zone range is determined in consideration of the engine oil temperature. In the memory 22 of the microcomputer 20, in addition to the maps M1 and M2 described above, a map M3 in which the red zone range E2 is associated with the engine oil temperature as shown in FIG. 7 is also stored. That is, when the engine oil temperature is low, the viscosity of the oil is high, so that a larger pressure is applied than when the oil temperature is high. For this reason, if the oil temperature is not taken into account, the red zone 51b may not be indicated when the oil temperature is low (immediately after the start of the engine) even though the abnormality is abnormal. Thus, in the map M3, basically, the lower the engine oil temperature is, the larger the proportion of the red zone range E2 is. The CPU 21 obtains a red zone range E2 from the map M3 based on the engine oil temperature which is a detection output of the temperature sensor 4, and outputs the red zone range E2 to the display control circuit 30.
[0019]
The zone control unit 31 of the display control circuit 30 adds the red zone ranges E1 and E2 obtained from the maps M2 and M3, respectively, to obtain a final red zone range E. Then, display control of the zone section 51 is performed based on the red zone range E, and the proportion of the red zone 51b is changed. Note that the pointer control is the same as in the previous embodiment.
By determining the red zone range in consideration of the engine oil temperature in this manner, an erroneous display is not particularly performed immediately after the engine is started.
[0020]
FIG. 8 is a flowchart showing a processing procedure for realizing the operation in the present embodiment as software. Also in this embodiment, warning control is performed. That is, it is determined based on the outputs of the pressure sensor 2, the rotation speed sensor 3 and the temperature sensor 4 whether or not a warning is necessary. There is no inconvenience that the red zone 51b is not instructed even though the warning has occurred.
[0021]
The display format of the engine oil pressure meter is not limited to the above. For example, the zone portion is a liquid crystal display, but the pointer may be mechanical. The zone portion is not limited to the arc shape as shown in FIG. 3, but may be a linear shape or another shape. The pointer may be of any type as long as it can indicate which of the zone portions is instructed, and need not be a rotary type.
[0022]
Although the example in which the red zone range is changed has been described above, it is also possible to obtain the above-described operation and effect only by controlling the pointer (for example, the rotation angle) without changing the red zone range. For example, when the present invention is applied to a rotary type pointer, the deflection angle of the pointer may be controlled based on the engine oil pressure and the engine speed, not simply by the engine oil pressure. Further, the swing angle may be controlled in consideration of the engine oil temperature.
[0023]
【The invention's effect】
According to the present invention, in displaying the engine oil pressure meter, the display control is performed in consideration of not only the engine oil pressure but also the engine speed, so that an accurate display is always obtained regardless of the level of the engine speed. Can be performed.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a lubrication system of an engine of a construction machine according to an embodiment.
FIG. 2 is a block diagram showing a control system of a display device of the construction machine.
FIG. 3 is a diagram showing a display example of an engine oil pressure meter.
FIG. 4 is a diagram showing a control map M1 in which a deflection angle of a pointer is associated with an engine oil pressure.
FIG. 5 shows a control map M2 in which a red zone range is associated with an engine speed.
FIG. 6 is a flowchart showing a display control procedure of an engine oil pressure meter.
FIG. 7 is a diagram showing a map M3 in which a red zone range is associated with an engine oil temperature.
FIG. 8 is a flowchart showing a display control procedure of an engine oil pressure meter according to another embodiment.
[Explanation of symbols]
2 pressure sensor 3 rotation speed sensor 4 temperature sensor 10 engine 11 oil pump 12 oil pan 20 microcomputer 21 CPU
22 memory 30 display control circuit 31 zone control unit 32 pointer control unit 40 warning control circuit 50 engine oil pressure meter 51 zone unit 51a normal region 51b abnormal region (red zone)
52 pointer 61 warning indicator light 62 warning buzzer M1 map for pointer control M2, M3 map for red zone range determination

Claims (5)

An oil pump for pumping engine oil to each part of the engine at a discharge pressure depending on the engine speed,
An engine oil pressure meter that displays an engine oil pressure range composed of a normal region and an abnormal region, and notifies the engine oil pressure by instructing any one of the engine oil pressure ranges with instruction means;
A pressure sensor for detecting the engine oil pressure,
A first control device that controls the instruction unit based on a detection output of the pressure sensor;
A speed sensor for detecting the engine speed,
A second control device for changing a ratio of the abnormal region in the engine oil pressure range based on a detection output of the rotation speed sensor. It further includes a temperature sensor that detects the engine oil temperature,
2. The construction machine according to claim 1, wherein the second control device changes a ratio occupied by the abnormal region based on a detection output of the rotation speed sensor and a detection output of the temperature sensor. 3. An engine oil pressure meter that displays an engine oil pressure range composed of a normal region and an abnormal region, and notifies the engine oil pressure by instructing any one of the engine oil pressure ranges with instruction means;
A display control device for controlling the indicating means in accordance with the engine oil pressure and changing a ratio of the abnormal region in the engine oil pressure range in accordance with the engine speed. Display device. A display of a construction machine that displays an engine oil pressure range composed of a normal region and an abnormal region, and controls an engine oil pressure meter that reports engine oil pressure by instructing one of the engine oil pressure ranges by an instruction means. A device,
As the engine oil pressure is higher, the indicating means outputs a first display signal so as to indicate a higher pressure side of the engine oil pressure range, and the higher the rotation speed is, the more the abnormal region occupies in the engine oil pressure range. A signal output device that outputs a second display signal such that the ratio increases,
A construction control device for controlling the indicating means based on the first display signal and performing a display control of the engine oil pressure range in accordance with the second display signal. Display device. An oil pump for pumping engine oil to each part of the engine at a discharge pressure depending on the engine speed,
An engine oil pressure meter that displays an engine oil pressure range composed of a normal region and an abnormal region, and notifies the engine oil pressure by instructing any one of the engine oil pressure ranges with instruction means;
A pressure sensor for detecting the engine oil pressure,
A speed sensor for detecting the engine speed,
A control device for determining an indicated position of the indicating means in consideration of the detected output of the rotation speed sensor to the detected output of the pressure sensor, and controlling the indicating means to indicate the determined indicated position. A construction machine.

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