CN202519735U - Plateau self-adaptation control device for excavator - Google Patents

Abstract

The utility model discloses a plateau self-adaptation control device for an excavator. The plateau self-adaptation control device is characterized by comprising a sensor unit using an air pressure sensor, a signal processing unit and a controller, wherein the sensing unit is used for detecting an atmospheric pressure in the working condition of the excavator through the air pressure sensor, and correspondingly calculating altitudes of a position for placing the excavator according to values of the atmospheric pressure detected by the air pressure sensor one by one; the signal processing unit obtains an engine output power value under the corresponding altitude according to the corresponding relation of the altitude and the engine output power reduction; and the controller is used for adjusting the size of input current of a proportional solenoid valve according to the engine output power value given by the signal processing unit. According to the plateau self-adaptation control device, the operation property and the fuel economy of the excavator in the plateau working condition can be improved, so that the engine is prevented from being in dead circulation caused by insufficient power.

Description

A kind of excavator plateau self-adapting control device

Technical field

The utility model relates to a kind of excavator plateau self-adapting control device, specifically a kind of be used for controlling automatically excavator on the plateau working environment control device of efficient operation more.

Background technology

Excavator is as a kind of machine of earthwork efficiently; It is widely used in each field, each zone; And in the world different zone, its height above sea level, climate temperature etc. also have nothing in common with each other, and different its airborne oxygen contents of height above sea level are also inequality; Thereby cause the abundant degree of fuel combustion different, this motor over-emitting black exhaust, degradation phenomenon appearance under its dynamic property when working under altitude environment have just occurred.The change that its gas handling system is increased air inflow can be eliminated above deficiency, yet if machine just works in this kind working environment in a short time, more than changing seems loses more than gain a little; If this phenomenon is not handled; Then can cause motor to get in the not enough endless loop of power output, i.e. the required input power of load is constant, but engine output descends; Then it can further aggravate to suppress car, over-emitting black exhaust situation, up to last stopping working occurring.

Summary of the invention

The utility model is for avoiding above-mentioned existing in prior technology weak point; A kind of excavator plateau self-adapting control device is provided; In the hope of improving operating characteristics and the fuel economy of excavator in the working environment of plateau, avoid motor to be absorbed in the under powered endless loop.

The utility model adopts following technical scheme for the technical solution problem:

The design feature of the utility model excavator plateau self-adapting control device is to be provided with:

One adopts the sensing unit of baroceptor, detects the atmospheric pressure in the excavator working environment with said baroceptor, and provides the height above sea level of excavator position correspondingly according to the detected atmospheric pressure value of said baroceptor;

One signal processing unit, the corresponding relation according to height above sea level and engine power descend obtains the engine output value under the corresponding height above sea level;

One controller, the engine output value that provides according to signal processing unit is regulated the size of the input current that offers proportion magnetic valve.

Compared with present technology, the utility model beneficial effect is embodied in:

1, the utility model is according to the difference of working region; Through changing the size of proportion magnetic valve input current; Suitably adjust the required input power of load; Realize the adjusting of pump power, thereby improved operating characteristics and the fuel economy of excavator in the working environment of plateau, avoided motor to be absorbed in the under powered endless loop.

2, it is more reasonable that the utility model makes the power match of car load, the intuition of decline largely occurs thereby reduced operator sensation car load operating characteristics.

Description of drawings

Fig. 1 is the utility model structured flowchart.

Fig. 2 is motor power decline curve figure under the height above sea level of correspondence in the utility model.

Fig. 3 is the utility model control model sketch map.

The specific embodiment

Referring to Fig. 1, Fig. 2 and Fig. 3, excavator plateau self-adapting control device is to be provided with in the present embodiment:

The sensing unit that constitutes by baroceptor 3, the atmospheric pressure that detects in the excavator working environments with baroceptor 3, and provide the height above sea level of excavator position correspondingly according to baroceptor 3 detected atmospheric pressure value;

Signal processing unit obtains the engine output value under the corresponding height above sea level according to the corresponding relation that height above sea level and engine power descend;

The size that the engine output value that controller 1 provides according to signal processing unit is regulated the input current that offers proportion magnetic valve 2.

In the practical implementation, select current mode baroceptor 3 for use, its measurement category is 0-1MPa, and the output signal is 4-20mA, and the atmospheric pressure detection signal is transformed into the current signal input in controller 1 at baroceptor 3; According to the relational expression between height above sea level of setting up in the geography and the atmospheric pressure, set up the relational expression between the current value that atmospheric pressure and controller 1 collected; Can find out when the different altitude height percentage that engine power descends according to Fig. 2.

The atmospheric pressure P that gathers under the excavator working environment through baroceptor 3 is transformed into current signal I; Relation between atmospheric pressure P and the height above sea level h is h=k * P (k is a scale factor), thereby has drawn the mA of relations I between current signal I and the height above sea level=[(20-4) * h/k]/(1-0).Power match mode such as Fig. 3 under the different altitude height; Can find out by Fig. 2; When height above sea level was lower than 2500m, the power output suppression ratio of motor was less, and can ignore height above sea level this moment influences it; Power match is then used the Plain pattern, then carries out plateau power match pattern later on when its height above sea level surpasses 2500m.This moment motor peak power output W ₀For:

W ₀=W×[1-(15/2500)%×(h-2500)]； （1）

W is the peak power output of motor under the working environment of Plain in the formula (1);

Be motor under the altitude environment output current for [1-(15/2500) % * (h-2500)] under the environment of Plain doubly.Under the working environment of Plain, H pattern, S pattern, the corresponding proportioning valve output current of L pattern are followed successively by I _H, I _S, I _L, its corresponding proportioning valve output current is I after excavator gets into the plateau mode of operation _H1, I _S1, I _L1It is respectively:

I _H1=I _H×[1-(15/2500)%×(X-2500)]； （2）

I _S1=I _S×[1-(15/2500)%×(X-2500)]； （3）

I _L1=I _L×[1-(15/2500)%×(X-2500)]； （4）

Consider the complexity that the working control process realizes, can height above sea level h be expressed as piecewise function:

$X=\left\{\begin{array}{cc}2500& 2500\&le;h<3500\\ 3500& 3500\&le;h<4500\\ 4500& h\&GreaterEqual;4500\end{array}\right.$

Thereby drawn the rational Match between the engine output and its load input power under the altitude mode.

Claims (1)

1. excavator plateau self-adapting control device is characterized in that being provided with:

One adopts the sensing unit of baroceptor (3), detects the atmospheric pressure in the excavator working environment with said baroceptor (3), and provides the height above sea level of excavator position correspondingly according to the detected atmospheric pressure value of said baroceptor (3);

One signal processing unit, the corresponding relation according to height above sea level and engine power descend obtains the engine output value under the corresponding height above sea level;

One controller (1), the engine output value that provides according to signal processing unit is regulated the size of the input current that offers proportion magnetic valve (2).

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