JPH0355620B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a monitoring device for a large construction vehicle equipped with an engine.

Conventionally, in construction machines such as power shovels and bulldozers, there are only a few abnormality warning items displayed by lamps, etc., and there is no need to install large-scale devices such as monitor devices. Therefore, for example, necessary warning lamps were installed on the side panel next to the driver's seat along with the operating lever, engine start key, other gauges, etc. However, as construction machinery becomes larger, the number of items to be inspected increases significantly. Therefore, simply arranging each of these indicator lamps on a panel would be extremely difficult for operators to understand, and would require less installation space. As it gets bigger, the driver's seat becomes narrower. Also,
Some large construction machines are equipped with twin engines, and special consideration must be given to monitoring devices for such machines.

The present invention has been made in view of the above-mentioned points, and it is easy to inspect a large number of inspection points, and when an abnormality occurs in any of the inspection points, the operator can visually tell what kind of abnormality the abnormality is. The purpose of the present invention is to provide a construction vehicle monitoring device that can instantly make an auditory judgment.

According to the present invention, a plurality of inspection items are classified into start-of-work inspection items, work-related abnormality confirmation items, and work-related abnormality alarm items, and each item is displayed on the display panel. If an abnormality occurs in any of the items, the corresponding item will be lit up and the first alarm will be generated.If an abnormality occurs in any of the abnormality alarm items during work, the corresponding item will be lit up and displayed. At the same time, a second alarm is generated, and furthermore, after the engine is started, the inspection of the start-up inspection items is disabled.

Hereinafter, the present invention will be described in detail based on one embodiment of the accompanying drawings.

FIG. 1 is a side view of the driver's seat of a construction machine equipped with a monitor device according to the present invention. A monitor device 3 is disposed at an overhead position (referred to as an overhead position). side panel 2
An operation lever, an engine start key, a gauge, etc. (not shown) are arranged in the .

In addition, as shown in FIG. 2, the monitor device 3 has a semi-transparent body on which are drawn figures, letters, etc. indicating each inspection item on its display panel. Each of the abnormal alarm items 3c and other display items 3d is arranged separately, and display lamps _L1 to _L24 (FIG. 3) for displaying inspection items are arranged inside each semi-transparent body.

FIG. 3 is a circuit diagram showing an embodiment of the monitor device according to the present invention. This monitor device is for use with twin engines, and each inspection item such as left and right engine oil level, left and right radiator water level, hydraulic oil level, and left and right battery fluid level is set as startup inspection item 3a, and the left and right air cleaner eyes are Check for abnormalities during work on inspection items such as clogging, automatic lubrication abnormality, left and right power take-off shaft (PTO) lubrication filter clogging, remaining fuel level, lifting ladder, main filter clogging, hydraulic oil level, pilot filter clogging, etc. Item 3b is used to check inspection items such as left and right engine oil pressure, left and right engine water temperature, tank air pressure, computer failure, etc. as item 3 for abnormality warning during work.
c, and other display items 3d include a clock, refueling frequency, emergency stop, etc.

Sensors S ₁ to S ₂₀ , relay contacts R ₄ and R ₅ , and limit switch LSW are arranged at each of the above inspection item locations. Each sensor S ₁ to _{S 20} measures the left and right engine oil level, left and right radiator water level, hydraulic oil level,
Left and right battery fluid levels, left and right air cleaner clogging,
Detects left and right PTO lubrication filter clogging, remaining fuel level, main filter clogging, hydraulic oil temperature, pilot filter clogging, left and right engine oil pressure, left and right engine water temperature, and tank air pressure. Among these sensors, sensors S ₁ to _{S 5} , S ₈ , S ₉ , and S ₁₈ , S ₁₉ are normally closed type sensors, which are turned on and grounded during normal times and turned off when abnormalities occur. , sensors S ₆ and S ₇ generate a voltage of 22 to 14 V during normal times, and generate a voltage of 14 V or less when abnormal.

Also sensors S ₁₀ ~ S ₁₇ and S ₂₀ , relay contacts
R ₄ , R ₅ and limit switch LSW are turned off in normal conditions, and turned on and grounded in abnormal conditions. The relay contacts R ₄ and R ₅ are driven by signals from the automatic lubrication control box and the computer control box, respectively, and the limit switch LSW is driven by the operation of the lifting ladder.

These sensors S ₁ to S ₂₀ , relay contacts R ₄ , R ₅ ,
Limit switch LSW has _{corresponding} lighting circuit
Connected to _X22 . In addition, lighting circuits X ₂ to X ₅ and X ₁₉ are configured in the same manner as lighting circuit X ₁ , lighting circuit X ₈ is configured in the same manner as lighting circuit X ₇ , and lighting circuit
Since X ₁₀ to X ₁₅ and X ₂₀ are configured similarly to lighting circuit X ₉ , and lighting circuit X ₁₇ is configured similarly to lighting circuit X ₁₆ , detailed circuits thereof will be omitted.

Here, terminal T ₁ has a specified voltage (e.g. 24V)
is input, and the line _L13 is grounded, so the display lamps _L1 to _L22 provided for each lighting circuit _X1 to _X22 are connected from the terminal _T1 through the high resistance r _p of each circuit. A current flows, and each of the display lamps L ₁ to L ₂₂ is dimly lit. Further, the voltage control section 4 inputs a specified voltage, lowers it to a predetermined voltage, and applies it to the line _l1 .

Well, first of all, before starting the start-up inspection, check the display lamp.
Perform a lamp check (monitor test) such as L ₁ to L ₂₂ . When monitor test switch SW1 is turned on, diodes _D6 to _D11 , _D26 to _D34 , _D56 to _D61 ,
The cathode side of D ₇₈ becomes the ground level, and each indicator lamp L ₁ to L ₂₂ lights up with high brightness. For example, the display lamp _L1 is dimly lit as mentioned above, but
When the monitor test switch SW1 is turned on, a current flows from the display lamp _L1 through the resistor _r17 , the diode _D12 , the diode _D18 , the line _l2 , and the switch SW1, and the lamp turns on with high brightness.

Also, when line l ₁₄ conducts, the transistor
The base potential of T _r6 decreases and transistor T _r6 is turned on. When the transistor T _r6 is turned on, a current flows through the clock generator 5, and the clock generator 5 generates a clock pulse. This clock pulse repeatedly turns on and off transistors T _r3 and T _r4 , causing current to flow intermittently through relay coil _R1 . As a result, relay contact R ₁ of relay coil R ₁ is turned on and off, current is passed through buzzer BZ1 and warning lamp 6, and buzzer BZ1 is operated.
Turn on the warning lamp 6. Similarly, line l ₁₅
When becomes conductive, the base potential of the transistor T _r11 decreases and the transistor T _r11 is turned on. When the transistor T _r11 is turned on, current flows through the clock generator 4, and the clock generator 4 generates a clock pulse. This clock pulse is a transistor
Repeatedly turn on and off T _r9 and T _r10 , relay coil _R2
A current is passed intermittently to the This turns on and off relay contact R ₂ of relay coil R ₂ and turns off buzzer BZ2.
and the buzzer BZ2 by passing current through the warning lamp 6.
and at the same time, the warning lamp 6 is turned on. Note that the buzzer BZ1 emits a buzzer sound that is louder than the buzzer BZ2.

Therefore, the operator can use the display lamps L ₁ to _{L 22} ,
Buzzers BZ1, BZ2 and warning lamp 6 can be checked.

Next, open monitor test switch SW1,
Proceed to start-up inspection. In this case, since both twin engines are stopped, the left and right alternators 8 and 9 do not generate electricity, so the transistor
T _r5 and T _r1 are turned off, and transistors T _r2 and T _r8
turns on. As a result, the reference voltage is applied from the terminal _T1 to the lighting circuits _X1 to _X5 via the transistor _Tr2 , and the reference voltage is applied to the emitters of the transistors _Tr18 and _Tr19 via the transistor _Tr8 .

If there is no abnormality in each start-up inspection item, each sensor S ₁ to S ₅ is turned on and grounded, and sensors S ₆ and S ₇ are
Since it generates a voltage of ~14V, lighting circuit x ₁
The transistors T _r12 , (not shown transistors T _r13 , T _r14 , T _r15 , T _r16 ) and the transistors T _r18 and T _r19 of _X5 are off.

Here, if there is an abnormality in the left engine oil amount, the sensor _S1 is turned off and the transistor T _r12 is turned on. When this transistor T _r12 is turned on, the line
l ₁₂ to display lamp L ₁ , resistor r ₁₇ , diode D ₁₂ ,
Current also flows through the path of the transistor T _r12 , and the indicator lamp _L1 lights up brightly. Furthermore, the transistor
T _r12 , the line l ₁₄ conducts through the diode D ₆ ,
As described above, the buzzer BZ1 operates to generate an alarm.

Furthermore, if there is an abnormality in the left battery fluid level, the output voltage of sensor _S6 decreases and transistor _Tr18 turns on. Logic circuit 7 includes transistors T _r18 and T _r19
When at least one of them is turned on, a predetermined voltage is applied to the Zener diode _ZD2 , and when the transistor _Tr18 is turned on, the transistor _Tr17 of the lighting circuit _X6 is turned on. This will cause the display lamp to appear in the same manner as above.
L ₆ lights up brightly and buzzer BZ1 operates to generate an alarm.

If there are no abnormalities in each start-up inspection item, the operator starts the twin engines. When the left and right alternators 8, 9 generate electricity by starting the twin engines, this current is rectified by a rectifier circuit consisting of diodes _D4 , _D5 , capacitors _C1 , C2 _, and resistors _r11 , _r12 . When one of the left and right alternators 8 and 9 generates a predetermined amount of power, the output voltage of the rectifier circuit is applied to the base of the transistor T _r5 via the Zener diode ZD ₁ to turn on the transistor T _r5 . When transistor T _r5 is turned on, transistor T _r1 is turned on, transistors T _r2 and T _r8 are turned off, and inspection circuits X ₁ to X ₆ for performing a start-up inspection are rendered inoperable. In other words, once the start-up inspection is completed and the construction vehicle enters the working state,
Make it impossible to force a start-up inspection. This eliminates the need for the operator to pay any attention to the initial inspection items.

Here, a case will be described in which an abnormality occurs in any of the abnormality check items during work. for example,
If the left air cleaner becomes clogged, sensor S ₈
turns off, turns on transistor T _r22 , and turns off transistor T _r21 . This will result in line l ₁
A current flows through the Zener diode _ZD3 , turning on the transistor T _r20 . When this transistor T _r20 is turned on, from the line l ₁₂ there is an indicator lamp L ₇ , a resistor r ₂₃ , a diode D ₃₅ , a transistor
Current flows in the path of T _r20 , line L ₁₃ , and the indicator lamp
_L7 lights up brightly and line _l14 becomes conductive via transistor _Tr20 and diode _D26 , which activates buzzer BZ1 and generates an alarm.

Additionally, if there is an abnormality in the automatic greasing system, relay contact _R4 is turned on and grounded, and timer circuit _TM9 of lighting circuit _X9 is activated. This timer circuit TM ₉
turns on transistors _Tr27 and _Tr26 when relay contact _R4 remains on for 1.5 to 2 seconds. When the transistor T _r26 is turned on, the indicator lamp L ₉ lights up brightly in the same manner as described above, and the buzzer BZ1 is activated to generate an alarm.

Furthermore, when the hydraulic oil temperature becomes low, the sensor _S14 is turned on and grounded, the timer circuits (not shown) of the lighting circuits _X14 and _X15 are activated, and the indicator lamps _L14 ,
L ₁₅ lights up brightly and buzzer BZ1 operates to generate an alarm. That is, when the hydraulic oil temperature becomes low, the main filter clogging indicator lamp L ₁₄ and the pilot filter clogging indicator lamp L ₁₅ are lit simultaneously to alert the operator to the abnormality in the hydraulic oil temperature. .

Next, a case where an abnormality occurs in any of the work abnormality alarm items will be described. Lighting circuits X ₁₆ and X ₁₇ connected to sensors S ₁₆ and S ₁₇ for detecting abnormalities in left and right engine oil pressures are operable only when alternators 8 and 9 are respectively generating a predetermined amount of power. _For example, when _the alternator 8 generates a predetermined amount of power, _the output voltage _of the rectifier circuit in _the lighting _circuit and joins the base of transistor T _r43 , turning on transistor T _r43 . When the transistor T _r43 is turned on, the transistor T _r42 is turned on and power is supplied from the line l ₁ through the transistor T _r42 to the timer circuit TM ₁₅ , and the timer circuit
TM ₁₆ becomes operational. The lighting circuit X ₁₆ in which the timer circuit TM ₁₆ has become operational performs the same operation as the lighting circuit X ₉ described above.

In other words, if there is an abnormality in the left engine oil pressure,
Sensor S ₁₆ is turned on and grounded, and timer circuit TM ₁₆ of lighting circuit X ₁₆ operates. This timer circuit
TM ₁₆ turns on transistors T _r41 and T _r40 when sensor S ₁₆ is turned on continuously for 1.5 to 2 seconds.
When the transistor T _r40 is turned on, a current flows from the line l ₁₂ to the display lamp L ₁₆ , the resistor ₃₂ , the diode D ₆₂ , the transistor T _r40 , and the line l ₁₃ , and the display lamp lights up brightly. Furthermore, the transistor
T _r40 , the line l ₁₅ conducts through the diode D ₅₆ ,
As described above, the buzzer BZ2 operates to generate an alarm.

In addition, lighting circuits X ₁₈ and X ₁₉ are equivalent to lighting circuit X ₁ , and lighting circuit _{X 20 is} equivalent to lighting circuit If so, the corresponding display lamp is brightly lit and the buzzer BZ2 is activated to generate an alarm.

Additionally, in the event of a computer failure,
Computer control box (not shown)
The relay contact R ₅ is turned on and grounded by the signal from the computer display power supply 11 to the display lamp L ₂₁ , resistor R ₃₈ , diode D ₆₉ , and relay contact R ₅
Current flows through the path, the indicator lamp _L21 lights up brightly, and the line _L15 becomes conductive via the relay contact _R5 and the diode _D61 , so the buzzer BZ2 is activated to generate an alarm. In addition, the emergency stop switch
Similarly to the above, when SW2 is turned on, the indicator lamp _L22 lights up brightly and the buzzer BZ2 is activated to generate an alarm.

This monitor device also has other display functions. That is, when current flows from line l ₁₂ to line l ₁₃ via relay coil R ₃ , relay coil R ₃ is energized, relay contact R ₃ is turned on, and clock 12 displays the time digitally ( (See Figure 2). Further, when the panel lamp switch SW3 is turned on, the entire panel is illuminated by a panel lamp (not shown), and at the same time, the lamp displaying the time is dimmed. Of course, the panel lamp switch SW3 is turned on at night.

When automatic lubrication is performed, the counter 16 counts the number of lubrications based on the signal from the automatic lubrication control box 15, lights up the indicator lamp _L23 indicating that lubrication is in progress, and the automatic lubrication is started. If this is not the case, the indicator lamp _L24 indicating that it is stopped is turned on (see Fig. 2).

In the examples, a model equipped with a twin engine is assumed as the applicable construction vehicle, but the present invention is not limited to this, and can also be applied to a vehicle equipped with one engine or three or more engines. Applicable.

As explained above, according to the present invention, it is possible to configure a monitor system that is easy for operators to understand in response to the increase in inspection items that occur as construction vehicles become larger. It can also be easily applied to vehicles equipped with it.

That is, if there is an abnormality, the operator is alerted by lighting the lamp and sounding the buzzer, so the operator does not need to constantly pay attention to the monitor device. In addition, after the inspection of the start-up inspection items is completed, the start-of-work inspection items are not activated.
During work, there is no need to pay any attention to the initial inspection items. Furthermore, when an abnormality occurs during work, it can be instantly determined based on the volume of the buzzer whether the abnormality belongs to the work abnormality confirmation item or the work abnormality alarm item.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a driver's seat equipped with a construction vehicle monitoring device according to the present invention, and FIG. 2 is a plan view of a display panel of the construction vehicle monitoring device according to the present invention.
FIG. 3 is a circuit diagram showing an embodiment of a construction vehicle monitoring device according to the present invention. DESCRIPTION OF SYMBOLS 1... Seat, 2... Side panel, 3... Monitor device, 3a... Start-of-work inspection items, 3b... Abnormality confirmation items during work, 3c... Abnormality alarm items during work, 3d... Other display items, 4... Voltage control section, 5 , 7... Clock generator, 6... Warning lamp, 8, 9... Alternator, 1
0...Logic circuit, 11...Computer display source, S1 _~
S20 ...Sensor, _R4 , _R5 ...Relay contact, LSW...Limit switch, _L1 to _L24 ...Indication lamp, BZ1,
BZ2…Buzzer, X ₁ ~ X ₂₂ …Lighting circuit, SW1 ~
SW3…Switch.

Claims (1)

[Scope of Claims] 1. In a monitoring device for a construction vehicle equipped with an engine, first and second monitors are arranged at predetermined inspection points for each of the start-of-work inspection items, abnormality confirmation items during work, and abnormality alarm items during work, and detect abnormalities. , a third sensor group;
first, second, and third indicator lamp groups corresponding to the first, second, and third sensor groups; and a display panel in which the first, second, and third indicator lamp groups are arranged for each item. , first and second alarm generators that generate first and second alarms, respectively, and arranged for each sensor of the first and second sensor groups, and first and second lighting circuit groups that light an indicator lamp corresponding to the sensor that has detected an abnormality based on the output of the sensor and generate a first alarm from the first alarm generator; and the third sensor. A display lamp is provided for each sensor in the group and lights up an indicator lamp corresponding to the sensor that detects an abnormality based on the output of the third sensor group, and also causes the second alarm generator to generate a second alarm. The fact that the engine is stopped is detected by the third lighting circuit group, the engine stop/operation detection means for detecting whether the engine is stopped or running, and the engine stop/operation detection means. operating the first lighting circuit group when the engine is running, and disabling the first lighting circuit group when the engine is detected to be running by the engine stop/operation detecting means. A construction vehicle monitoring device comprising a circuit. 2. The engine is a twin engine, and the engine stop/operation detecting means detects whether the twin engine is operating by detecting whether the output of at least one alternator provided in the twin engine has reached a predetermined voltage. The construction vehicle monitoring device according to claim 1, which detects whether the construction vehicle is moving or stopped. 3. The construction vehicle monitoring device according to claim 1, wherein the first and second alarms generated by the first and second alarm generators are buzzer sounds with different volumes, respectively. 4. The construction vehicle monitoring device according to claim 1, wherein the display panel is disposed at an overhead position of the driver's seat. 5 Among the second and third sensor groups, the second and third lighting circuit groups corresponding to the sensors that are affected by vibrations during work and driving of the construction vehicle are configured to detect abnormalities when the sensors detect the sensor. Claims include a timer circuit that starts when the abnormality detection time occurs and measures the abnormality detection time, and lights up a corresponding indicator lamp when the timer circuit measures the abnormality detection time for a predetermined time or more. The construction vehicle monitoring device according to item 1.