JPH0721657Y2 - Output monitor of hydraulic excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an output monitor of a hydraulic excavating machine, which is used to monitor the output of hydraulic horsepower used by an operator during work of his own hydraulic excavating machine. Display monitor.

(Prior Art) Conventionally, a device corresponding to the present invention has not been known, and as an alternative to the present invention, an operator experiences his / her own experience by feeling engine sound, hydraulic sound and actuator operation by feeling such as speed. It was a method of performing a sensory evaluation based on the above, and estimating the hydraulic horsepower (the hydraulic horsepower by the product of P and Q shown in FIG. 6) is estimated.

(Problems to be solved by the device) The conventional sensory evaluation for knowing the currently used hydraulic horsepower has the following drawbacks.

(1) The evaluation standard varies depending on the person ... The evaluation standard is different depending on the experience and knowledge of each operator and the physical condition of the operator.

(2) Hydraulic excavators cannot be used efficiently ... In recent years, hydraulic excavators are becoming more sophisticated and more efficient.
If the functions originally provided in the hydraulic excavator depended only on the sensory evaluation, it is becoming difficult to bring out this function sufficiently. If this is illustrated based on the hydraulic horsepower mode switching diagram of the hydraulic excavating machine of FIG. 6, the hydraulic excavating machine of recent years is called a hydraulic horsepower mode changing method, and the operator predicts the work load to be performed in the future, and The hydraulic horsepower mode for light loads (L mode), the hydraulic horsepower mode for medium loads (S mode), and the super-heavy load for the purpose of preventing economic loss such as preliminary fuel consumption and machine life reduction by limiting the hydraulic horsepower of the excavating machine. Many have a full hydraulic horsepower mode (H mode) for load. However, even with such a mode changing method, it is the above-mentioned sensory evaluation that the operator determines whether the next work load is light, medium or super heavy, and as a result, the hydraulic excavator is fully used. It had a drawback that it was doubtful whether it was there.

The present invention revises the conventional evaluation criteria based on the skill of the operator, visually shows the judgment criteria that does not depend on the skill of the operator to the operator, and makes it possible to sufficiently bring out the functions originally possessed by the hydraulic excavator of recent years. The purpose of this is to provide an output monitor.

(Means for Solving the Problem) (1) In a hydraulic excavating machine, a means for detecting the number of rotations of a hydraulic pump and issuing a signal, and a discharge oil amount (cc / rev) of the hydraulic pump are detected and a signal is output. Means for emitting an operating pressure of a hydraulic circuit, a signal for outputting a signal, a microcomputer for inputting the signal and calculating an average hydraulic horsepower of a hydraulic pump for a predetermined time (t), and a signal from the microcomputer In response to this, a monitor for displaying the average hydraulic horsepower of the hydraulic pump is provided.

(2) Further, the monitor is configured to display the average hydraulic horsepower of the hydraulic pump for each work mode.

(First Embodiment) A first embodiment of the invention will be described with reference to FIGS. 1 to 4.

(1) Main configuration of the present embodiment First, A / which has not been described in the above (means for solving the problem)
If the D converter 40, the input port 50, the inside of the microcomputer, and the output port are added based on FIG. 1, the A / D converter can calculate the rotation, flow rate, and hydraulic pressure as analog signals by the microcomputer. This output is converted to a digital signal
It is transmitted to the microcomputer via the data input 50. The microcomputer 60 is well known
It is composed of a CPU 62, a RAM 61, and a ROM 63. ROM63
Stores a calculation program, and instructs the CPU 62 to execute calculation, input data, send and receive data to and from the RAM 61. The output of the microcomputer 60 is sent to the monitor 80 via the data output port 70.

Next, the means for detecting the input signal will be described with reference to FIG. 2. A variable displacement hydraulic pump 101-10n consisting of a plurality of sets (n sets) shown in the figure, which is a hydraulic circuit of a hydraulic excavating machine,
Servo valve 201-20 for controlling the amount of oil discharged from the hydraulic pump
n, the relief valve 301-30N, in a pilot hydraulic circuit for providing a control hydraulic pressure 211-21n the configured main hydraulic circuit and servo valve in operating valves 401-40n and actuators 501-50N, the rotational speed N _ni of the hydraulic pump Sensor to detect 11-1n
Is mounted on the hydraulic pump shaft and transmits a rotation signal to the A / D converters 411-41n. Sensors 321-32n that detect the main hydraulic circuit hydraulic pressure 311-31n are installed in the main hydraulic circuit,
(B1) to have a relationship such as hydraulic P _ni and the voltage V _ni illustrated are sending the voltage signal V _{an nip} to the A / D converter 431-43N. Sensor that detects the amount of discharge q _ni of the hydraulic pump 221-
22n is for detecting the pilot oil pressure 211-21n, and is shown in (b2) of the hydraulic pump discharge oil quantity q _ni and pilot oil pressure P
The signal voltage V _niq is transmitted to the A / D converters 431-43n based on the relationship with _nip and the relationship between the pilot oil pressure P _nip and the signal voltage V _{niq in} (b3). In addition, when n and i in each symbol are described, n represents n sets of hydraulic circuits.
Means each signal as a unit of calculation in the microcomputer described later, and hereinafter, n and i are also used in this sense.

As described above, the signal of the hydraulic excavating machine N _ni (V _niN ), P
_ni (V _nip ) and q _ni (V _niq ) are input from each A / D converter to the microcomputer via the input port 50. Next, an arithmetic program in the microcomputer will be described with reference to FIG. Input signal N _ni ,
At P _ni , q _ni , the signals N _ni , P _ni are their voltage signals V _niN ,
Since there is no particular problem because of the relationship between V _nip and a linear function, as shown in the PQ diagram of FIG. 6, the hydraulic horsepower has a hyperbola of PQ = constant q _ni . ), The voltage signal V _niq and the discharge flow rate q _ni are similar to the above-mentioned hyperbola, so in the present embodiment in which a spring is used in the servo valve, there is a relationship that changes according to the spring constants k ₂ and k _3. , The calculation program shown in the flowchart of FIG. 3 (b) is required. Therefore, the input signal V _niq is the judgment reference point.
Q _ni = q _1n , k ₂ V _ni + q _2n , k ₃ V _ni + q _3n depending on V ₁ , V ₂ , V ₃
Alternatively, the discharge oil amount q _ni of q _{4 n} is calculated and output. FIG. 3 (a) shows a flow chart of the main program, in which the signals of N _ni , P _ni , and q _ni are input (step 1), and the hydraulic horsepower Hi at the time of input of the hydraulic circuit is calculated as follows. Calculate with the formula (Step 2) Hi = N _ni × P _ni × q _ni This is summed Z times for t seconds, and calculated with the following formula Is executed (step 4, and in this embodiment, t = 1 second), this is output (step 4), and the routine is recurred to step 1. The average hydraulic horsepower H _t is transmitted from the microcomputer 60 to the monitor 80 via the output port 70. The monitor 80 displays the average hydraulic horsepower H _i . In the case of this example, as shown in FIGS. 4 (a) and 4 (b), the panel is divided every 10 horsepower, and the panel is divided into continuous hydraulic pressures at each stage. Horsepower H _i =
In 10m + y, y is rounded off and displayed.
For example, if the horsepower is 214 horsepower, then H _i = 10 × 21 + 4, and 4 is rounded down and only the m = 21 segment is lit in green.
(A) illustrates an instantaneous (1 second) lighting status (hydraulic horsepower status) in the H mode, and (b) illustrates an instantaneous (1 second) lighting status (hydraulic horsepower status) in the S mode. Of course, (a) In the H mode, the display point of H is its maximum horsepower, and in the S mode of (b), the display point of S is its maximum horsepower, and these lights are continuously changed and displayed every second. To do.

The above is the configuration and operation of the present embodiment.

(Second Embodiment) The second embodiment will be described with reference to FIG. 5. This embodiment is different from the first embodiment in the following points.

(1) The pilot hydraulic pressure of the machine of this embodiment is once input to the proportional voltage generator 700, and the output voltage V _niq
Acts on the electromagnet of the proportional solenoid servo valve 601-60n. Therefore, in this example, this voltage V _niq is used as the discharge oil amount signal of the discharge oil amount q _ni of the hydraulic pump.

(2) In the first embodiment, n hydraulic pump rotation speed sensors were mounted for each hydraulic pump, but in the present embodiment, only one engine rotation speed is taken as the input signal Ne. Therefore, as shown in the partial diagram of the calculation program of (b), the output of step 21 of the first embodiment is 21 = Hi = C _ni × N _e × P _ni × q _ni .

C _ni is the speed reduction ratio of each hydraulic pump, and there are different or the same ones individually, and each is added to the input engine rotation N _e , and becomes the rotation speed of each hydraulic pump.

The second embodiment is the same as described above, but the monitor display that occurs is of course the same as that of the first embodiment, and the same effects are obtained.

(Effect of the Invention) With the present invention, it has become possible to solve the drawbacks that have hitherto been problems as described below.

(1) Elimination of variations due to humans ... Since the machine itself calculates the hydraulic horsepower at the present time and visually displays it on the operator, it is possible to eliminate variations in the situation of hydraulic horsepower.

(2) The hydraulic excavator can be used efficiently ... In the recent use of the so-called mode change type hydraulic excavator, the operator does not simply predict and change the mode before the operation but the monitor is displayed during operation. Since it is possible to change the mode in a timely manner while recognizing the hydraulic horsepower to be used, it is possible to efficiently use a high-grade hydraulic excavating machine such as mode change control.

[Brief description of drawings]

FIG. 1 is a block diagram of an output monitor of a hydraulic excavating machine according to the present invention, FIGS. 2 to 4 are first embodiment diagrams according to the present invention, and FIG. 5 is a second embodiment diagram according to the present invention. FIG. 6 is a view showing another mode (a) and its program (b) in the first embodiment, and FIG. 6 is a pressure-flow rate diagram (PQ diagram of a hydraulic excavating machine of hydraulic horsepower mode switching type). ). Each of FIGS. 2 to 4 of the first embodiment is as follows. Fig. 2 (a) ... Example of installation of each detection means based on the present invention in hydraulic circuit diagram of hydraulic excavator (b1) ... Relational diagram of operating oil pressure P _ni and detection voltage V _niq (b2) ... variable Relationship diagram between displacement type hydraulic pump discharge oil quantity q _ni and servo valve pilot oil pressure P _nip for controlling it (b3) ... Relationship between servo valve pilot oil pressure P _nip and detection voltage V _niq Fig. 3 (a) ... Flow chart of main program of microcomputer (b) ... Flow chart of program for converting detection voltage V _niq of servo valve pilot hydraulic pressure of _{microcomputer} into hydraulic pump discharge oil quantity q _ni (c) ... Hydraulic pump discharge oil quantity q _ni the graph showing the relationship between a servo valve pilot hydraulic pressure of the detection voltage V _niq 4 views (a) ... heavy load work mode Figure 4 displays an example diagram of the output monitor in (H mode) (b) ... middle load working mode (S mode ) In Example of monitor display Fig. 10 (11-1n) …… hydraulic pump rotation sensor 20 …… (221-22n) …… hydraulic pump discharge oil amount sensor 30 (301-30n) …… actuating hydraulic sensor 40 …… A / D Converter 50 …… Signal input port 60 …… Microcomputer 70 …… Signal output port 80 …… Monitor 101-10n …… Hydraulic pump 201-20n …… Servo valve 301-30n …… Relief valve 401-40n …… Operating Valve 501-50n ... Actuator

Claims (2)

[Scope of utility model registration request] 1. In a hydraulic excavating machine, a means for detecting the number of rotations of a hydraulic pump and issuing a signal, a means for detecting the discharge oil amount (cc / rev) of the hydraulic pump and issuing a signal, and a hydraulic circuit Means for detecting an operating oil pressure and issuing a signal, a rotation speed signal of the hydraulic pump, a discharge oil amount signal of the hydraulic pump,
A microcomputer for inputting an operating hydraulic pressure signal of the hydraulic circuit to calculate an average hydraulic horsepower of the hydraulic pump for a predetermined time (t), and a monitor for receiving the signal from the microcomputer and displaying the average hydraulic horsepower of the hydraulic pump. An output monitor for a hydraulic excavating machine, comprising: 2. The output monitor of the hydraulic excavating machine according to claim 1, wherein the monitor displays the average hydraulic horsepower of the hydraulic pump for each work mode.