JP2003090064A - Indication device for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide indication device for construction machine capable of improving the visibility of two indication contents at an instrument indication portion displayed by liquid crystal. SOLUTION: This is a display picture 11 for an instrument which is so constructed as varying the amount of display by liquid crystal based on the detection signal output from sensors 41 and 42, and has liquid crystal display regions 14 and 16 indicating the amount of display indicated by the change in a region occupied area, and symbols 16a, 15b, 17a, 17b indicated in inner portion of the liquid crystal display region; when the region displaying the amount of display in the liquid crystal display region is overlapped with a symbol, the state of display of the symbol is formed to become opposite to the display of the region.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for a construction machine, and more particularly, to a display device for a construction machine, which is a display device for an instrument provided in front of a driver's seat of a construction machine such as a hydraulic excavator and has high visibility. .

[0002]

2. Description of the Related Art In recent years, in a display device for displaying instruments such as a fuel gauge and an engine thermometer provided in a driver's seat such as a hydraulic excavator, a liquid crystal display unit has been adopted. An example of the display screen of the display device is shown in FIG. In FIG. 5, 1
Reference numeral 11 is a liquid crystal display screen, 112 on the right side is a fuel gauge display section, and 113 on the left side is an engine thermometer display section. The engine temperature is actually measured by the temperature of the engine cooling water.

A liquid crystal display area 114 composed of, for example, six segments 114a is formed in the fuel gauge display section 112. Each segment 114 in the liquid crystal display area 114
The display is performed in units of a. In the area of the lowermost segment 114a, the letter symbol 115 "E"
“A” is represented by a liquid crystal formed by a segment having a shape of “E”. “E” means empty. In the region of the uppermost segment 114a, a letter symbol 115b of "F" is written by liquid crystal formed by a segment of "F" shape. “F” means full.
In the liquid crystal display area 114, a lighting display (hatched portion) is performed based on an output signal from a sensor that detects the remaining amount of fuel in the fuel tank. As the amount of fuel in the fuel tank increases, the lighting display is sequentially performed for each segment from the bottom segment 114a, and the lighting display is performed up to the top segment 114a when the tank is full. When the amount of fuel in the fuel tank decreases, the state of lighting display changes in the opposite direction. The remaining amount of fuel in the fuel tank is displayed on the liquid crystal display area 11
It is represented by the occupied area of the lighting display in 4.
Further, the fuel gauge display unit 12 is depicted with a graphic symbol 131 indicating that it is a fuel gauge.

The display mode of the engine thermometer display section 113 is basically the same as that of the fuel gauge display section 112. That is, the liquid crystal display area 116 including the six segments 116a
Are formed, and display is performed with each segment 116a as a unit. In the area of the lowermost segment 116a, a character symbol 117a "C" is written by a liquid crystal formed by a segment of a shape "C",
“C” means Cool (low temperature). In the area of the uppermost segment 116a, a character symbol 117b of "H" is written by a liquid crystal formed by a segment of a shape of "H", and "H" means Hot (high temperature).
It means that. In the liquid crystal display area 116, display is performed based on the output signal from the sensor that detects the engine temperature. As the engine temperature increases, the lighting display is sequentially performed from the bottom segment 116a in segment units, and the top segment 116a is displayed in a predetermined high temperature state.
The lighting display is performed up to a. When the engine temperature decreases, the lighting display changes in the opposite direction. The state of the engine temperature is represented by the occupied area of the lighted display in the liquid crystal display area 116. Also, the engine thermometer display section 11
3 is a graphic symbol 1 indicating that it is an engine thermometer.
32 is drawn.

In addition, on the display screen 111 of the display device, in addition to the notations 118 and 119 of "actual load working radius" and "rated load height", a liquid crystal segment pattern 120 for displaying numerical values for displaying related numerical values. , 121 are provided.

[0006]

According to the display screen of the display device using the above-mentioned liquid crystal, for example, in the fuel gauge display section 112, the liquid crystal display area 114 for displaying the remaining fuel amount in the fuel tank is displayed. When the highest segment 114a is lit and displayed, the lit display of the letter symbol “F” 115b that is provided over the segment overlaps, which is very difficult for the driver to see and the visibility is very poor. There is a problem called. That is, both the lighting display of the segment 114a and the lighting display of the character symbol 115b in the liquid crystal display area 114 displaying the remaining amount of fuel are in a positive relationship, which lowers the recognition level of the display. The above problem similarly occurs in the engine thermometer display section 113.

An object of the present invention is to solve the above problem, and to provide a display device for a construction machine capable of improving the visibility of two display contents on an instrument display unit displayed by liquid crystal. It is in.

[0008]

The construction machine display device according to the present invention is configured as follows in order to achieve the above object.

The first construction machine display device (corresponding to claim 1) is a display device configured such that the display amount by the liquid crystal changes based on the detection signal output from the sensor. Has a liquid crystal display area for displaying a change in the area occupied by the area and a symbol written inside the liquid crystal display area, and when the area for displaying the display amount in the liquid crystal display area overlaps the symbol, The display state is configured to be opposite to the display of the area.

In the first construction machine display device described above, in the display by the liquid crystal display meter arranged in front of the driver's seat of the construction machine such as a hydraulic excavator, lighting in the liquid crystal display area for displaying the remaining fuel amount and the like. If the display area is occupied by the display area and the display of other symbols such as characters displayed on the liquid crystal element overlaps on the liquid crystal display area, the positive / negative relationship relating to the liquid crystal display is used. The display is performed such that the lit display area of the liquid crystal display area is positive and the symbol display is negative, so that the visibility of two different display contents can be improved.

In the second construction machine display device (corresponding to claim 2), in the first configuration, when the area for displaying the display amount in the liquid crystal display area does not overlap the symbol, the display state of the symbol is It is characterized in that it is the same as the display of the above area. When the illuminated display area of the liquid crystal display area and the symbol do not overlap with each other, even if the symbol is displayed in the positive state similarly to the illuminated display area, there is no problem in visibility.

In the third construction machine display device (corresponding to claim 3), in each of the above constructions, the change of the area occupied in the liquid crystal display area occurs in an analog manner, and the symbol is at least the upper limit of the liquid crystal display area. It is characterized by being marked on the position. This configuration is a general configuration as a display mode of a display device for construction machinery. For example, the fuel gauge display unit has a display unit of a character symbol “F” at the upper limit position, and the engine thermometer display unit has the upper limit position. To "H"
Is provided for displaying the character symbol. A change in quantity is given as an analog image by utilizing a change in area occupation area.

[0013]

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

The configuration, shape, size and arrangement relationship described in this embodiment are merely shown to the extent that the present invention can be understood and implemented, and the numerical values and the composition (material) of each component ) Is merely an example.
Therefore, the present invention is not limited to the embodiments described below, and can be modified into various forms without departing from the scope of the technical idea shown in the claims.

An example of a display screen of a display device for construction machinery is shown in FIG.
And shown in FIG. In this embodiment, the construction machine is assumed to be a hydraulic excavator, but the construction machine is not limited to this. The instrument display screen shown in FIGS. 1 and 2 is substantially the same as the display screen shown in FIG. However, the display method is different, and that point will be clarified in the following description as a characteristic configuration. 1 and 2
Both show the same instrument display screen, but the amount of the display object as an instrument is different.

First, the basic structure of the display screen will be briefly described again. For the parts that are not described, the contents described in the “Prior Art” section will be referred to if necessary. The instrument display screen 11 according to the present embodiment has 2
Color liquid crystal is used as the display unit. On the display screen 11, a fuel gauge display unit 12 is provided on the right side and an engine thermometer display unit 13 is provided on the left side. Engine temperature is measured by the temperature of engine cooling water.

A liquid crystal display area 14 composed of, for example, six segments 14a is formed in the fuel gauge display portion 12, and the display is performed by using each segment 14a as a unit. In the area of the lowermost segment 14a, a character symbol 15a "E" is written by a liquid crystal formed of a segment having a shape "E". Top segment 14
In the area a, the character symbol 15b "F" is written by the liquid crystal formed by the segment of the shape "F". In the liquid crystal display area 14, a lighting display (state of a shaded portion) is performed based on an output signal from a sensor that detects the remaining amount of fuel in the fuel tank. The amount of fuel in the fuel tank (remaining amount of fuel) is represented by the occupied area of the lighting display in the liquid crystal display area 14.

The engine thermometer display section 13 is also provided with a liquid crystal display area 16 composed of, for example, six segments 16a, and the display is performed with each segment 16a as a unit. In the region of the lowermost segment 16a, the character symbol 17a "C" is written by the liquid crystal formed by the segment of the shape "C". In the region of the uppermost segment 16a, the character symbol 17b "H" is written by the liquid crystal formed by the segment of the shape "H". In the liquid crystal display area 16, display is performed based on the output signal from the sensor that detects the engine temperature. The state of the engine temperature is the liquid crystal display area 1
It is represented by the occupied area of the lighting display in 6.

Further, on the display screen 11 of the display device, notations 18, 1 of "actual load work radius" and "rated load height" are shown.
9 and liquid crystal segment patterns 20 and 21 for displaying numerical values for displaying related numerical values.

A device configuration for controlling the display operation on the instrument display screen 11 will be described with reference to FIG.

The control unit 31 comprises a CPU 32, a memory 33, an input interface 34 and an output interface 35. The memory 33 has a conversion table 34 that outputs display instruction data that controls the display content of the corresponding display unit based on the levels of the detection signals given from various sensors. The memory 33 also includes a conversion program 35 and a display control program 36. The conversion program 35 is a program for controlling the input and output operations of the conversion table 34. The display control program 36 changes the occupancy area of the lighting display in the liquid crystal display area regarding the lighting display of the respective segments 14a and 16a of the liquid crystal display areas 14 and 16 and the lighting display of the character symbols 15a, 15b, 17a and 17b. When the two lit displays of the segment and the character symbol overlap, the lit display segment is controlled to be positive (positive) display and the character symbol is negative (negative) display, and when the two do not overlap, the character symbol is controlled to be positive display. It is a program.

The remaining fuel amount in the fuel tank is detected by the remaining fuel amount sensor 41. The detection signal s1 output from the fuel level sensor 41 is input to the control unit 31 via the input interface 37. The CPU 32 detects the detection signal s
The display instruction data D1 is taken out based on the conversion table 34 for the remaining fuel amount prepared in the memory 33 according to the signal level of 1, and the display instruction signal s2 is output based on this, through the output interface 38. Instrument display screen 11
In the fuel gauge display section 12, the operation of lighting each of the six segments 14a of the liquid crystal display area 14 and the character symbols 15a and 15b is controlled based on the display instruction signal s2.

The engine temperature is detected by the temperature sensor 42. The detection signal s3 output from the temperature sensor 42 is sent to the control unit 31 via the input interface 37.
Entered in. The CPU 32 takes out the display instruction data D2 based on the engine temperature conversion table 34 prepared in the memory 33 according to the signal level of the detection signal s3, and outputs the display instruction signal s4 based on the display instruction data D2.
Output via 8. The engine thermometer display unit 13 of the instrument display screen 11 controls the lighting display operation of each of the six segments 16a and the character symbols 17a and 17b of the liquid crystal display area 16 based on the display instruction signal s4.

Next, an example of the display control executed by the above-described display control program 36 will be described with reference to the flow charts shown in FIGS. 1 and 2 and FIG.

In this example, an example of the fuel gauge display section 12 on the instrument display screen 11 will be described. Regarding the liquid crystal display area 14 in the fuel gauge display unit 12, the state shown in FIG. 1 shows a state in which four segments 14a are lit and displayed from the lower side, and the state shown in FIG. It shows a state in which it is lit.

The detection signal s1 relating to the remaining fuel amount detected by the remaining fuel amount sensor 41 added to the fuel tank or the like is input to the CPU 32 of the control unit 31 (step S1).
1). The CPU 32 stores the value related to the detection signal s1 in the memory 3
Input into the conversion table 34 for the remaining fuel amount prepared in No. 2 and take out the corresponding display instruction data D1 (step S
12). The display instruction data D1 corresponds to the lighting display operation of each of the six segments 14a forming the liquid crystal display area 14,
Each of the two character symbols 15a and 15b is composed of a plurality of data for controlling the lighting display operation.

Next, it is determined whether or not both the display instruction data of the lowermost segment 14a and the display instruction data of the character symbol 15a among the respective data included in the display instruction data D1 perform the lighting operation. (Step S1
3). If YES in determination step S13, the display instruction data of the lowermost segment 14a is held in the display instruction data (positive display) related to the lighting operation, and the display instruction data of the character symbol 15a is not displayed. The data (negative display) is changed (step S14).
If NO in determination step S13, the display instruction data of the lowermost segment 14a is changed to the display instruction data that does not perform the lighting operation, and the display instruction data of the character symbol 15a is changed to the display instruction data that performs the lighting operation (step S
15).

Next, it is determined whether or not both the display instruction data of the uppermost segment 14a and the display instruction data of the character symbol 15b among the respective data included in the display instruction data D1 perform the lighting operation. (Step S1
6). If YES in determination step S16, the display instruction data of the uppermost segment 14a is held in the display instruction data (positive display) related to the lighting operation, and the display instruction data of the character symbol 15b is not displayed. The display is changed to (negative display) (step S17).
If NO in determination step S16, the display instruction data of the uppermost segment 14a is changed to the display instruction data that does not perform the lighting operation, and the display instruction data of the character symbol 15b is changed to the display instruction data that performs the lighting operation (step S
18).

The display instruction data D1 adjusted by the CPU 32 as described above is converted into the display instruction signal s2, and the fuel gauge display unit 1 is output through the output interface 38.
Then, the display operation or the non-lighting operation of each of the plurality of liquid crystal elements is controlled (step S19).

Based on the control operation by the above display control program 36, when the remaining fuel amount in the fuel tank is about 2/3, the display state of the fuel gauge display section 12 becomes as shown in FIG. That is, the lowermost segment 14a performs a lighting display operation (positive display), and the character symbol 15a does not perform a lighting operation and is a negative display. Further, the uppermost segment 14a does not perform the lighting operation (negative display), and the character symbol 15b performs the lighting operation (positive display).

The engine thermometer display section 13 of the instrument display screen 11 shown in FIG. 1 is also subjected to display control separately from the control of the fuel gauge display section 12. In the illustrated example of FIG. 1, for convenience, the display is the same as the display state of the fuel gauge display unit 12 described above.

Next, an example of display control when the remaining amount of fuel in the fuel tank is full will be described based on the control operation by the display control program 36. In this case, the display state of the fuel gauge display unit 12 is as shown in FIG. That is, the display operation of the lowermost segment 14a and the character symbol 15a is the same as that described in FIG. The uppermost segment 14a is turned on (positive display), and the character symbol 15b is not turned on (negative display).

The display control of the engine thermometer display section 13 of the instrument display screen 11 shown in FIG. 2 is also performed separately from the control of the fuel gauge display section 12. In the illustrated example of FIG. 2, for convenience, the display is the same as the display state of the fuel gauge display unit 12 described above.

As is apparent from the display examples of the fuel gauge display section 12 of the instrument display screen 11 shown in FIGS. 1 and 2, the liquid crystal display area 1
When the segment 14a of No. 4 and the lighting operation of the character symbols 15a and 15b overlap, preferably, the segment 14a of the liquid crystal display area 14 is lit and displayed, and the display operation of the character symbols 15a and 15b is the opposite. Therefore, the visibility of the display content can be improved. For this reason, safety at the time of driving operation is improved, and maintenance of the machine can be easily performed.

Although the example of the display screen for the instrument has been described as the display device for the construction machine using the above liquid crystal, the present invention is not limited to this. For example, if it is a hydraulic excavator,
Also in the graphic display section showing the rotation state of the work machine section and the driver's seat section, or the graphic display section showing the state of the excavation depth, etc., a display area section in which the amount changes in an analog manner in the sense of a change in the area area, When symbols such as characters written in the display area portion overlap each other, a display portion having high visibility can be provided based on the display utilizing the positive / negative relationship described above.

[0036]

As is apparent from the above description, according to the present invention, in a display device for a construction machine which is displayed by a liquid crystal, when two kinds of display contents overlap, a positive / negative relationship is used. By displaying and making the two types of display contents opposite to each other, it is possible to enhance the visibility and thereby improve the safety.

[Brief description of drawings]

FIG. 1 is a diagram showing a first display state of a display screen of a construction machine display device according to the present embodiment.

FIG. 2 is a diagram showing a second display state of the display screen of the construction machine display device according to the present embodiment.

FIG. 3 is a configuration diagram showing a device configuration related to a display operation of a display device.

FIG. 4 is a flowchart for executing a display operation.

FIG. 5 is a view showing a typical display state of a display surface of a conventional construction machine display device.

[Explanation of symbols]

11 Instrument display screen 12 Fuel gauge display 13 Engine thermometer display 14 LCD display area 14a segment 15a, 15b character symbol 16 LCD display area 16a segment 17a, 17b character symbol 31 Control unit 32 CPU 33 memory 34 conversion table 35 Conversion program 36 Display control program

Claims (3)

[Claims] 1. A construction machine display device in which the display amount of liquid crystal changes based on a detection signal output from a sensor, and a liquid crystal display region for displaying the display amount by a change in area occupation area, and the liquid crystal display region. When the area for displaying the display amount in the liquid crystal display area overlaps with the symbol, the display state of the symbol is opposite to the display of the area. Display equipment for construction machinery. 2. The display state of the symbol is the same as the display of the region when the region for displaying the display amount in the liquid crystal display region does not overlap with the symbol. Display equipment for construction machinery. 3. The change of the area occupied by the liquid crystal display area occurs in an analog manner, and the symbol is written at least at an upper limit position of the liquid crystal display area. Display equipment for construction machinery.