DD289146A5 - METHOD FOR CONTROLLING ELECTRIC HYDRAULIC DRIVES IN MOBILE MACHINES - Google Patents

Abstract

It was a method for controlling electro-hydraulic drives in mobile machines with hydrostatic drive and electrically controlled control technology worked out, which determined by mechanical separation, the control movement of a control lever in two mutually orthogonal directions Masz the actuating movement in both directions with optocouplers and an absolutely digital Binaer code becomes. The aim of the invention is to realize signal generation and further processing with a low component cost. Furthermore, the mechanical effort compared to previous solutions of levers to be minimized. Temperature and operating voltage influences are excluded. Furthermore, a position-independent zero position is present, which adjusts itself when Nichtbetaetigung the control lever. Actuating and processing clock can be asynchronous, without causing a distortion of the Meszwertes. The zeroing range is stretched to suppress interference. electro-hydraulic control technology; Lever; absolutely digital binary code; optocouplers; position-independent zero position; Zero area; Processing clock; Deputy clock; Suppression}

Description

See 4 side drawings

Field of application of the invention

The invention relates to a method for manual control of electro-hydraulic drives in mobile machines with hydrostatic drive and electrically controlled positioning.

Characteristic of the known state of the art

At present, two basic solutions for controlling any drives are known. On the one hand, devices with analog signal generation are used, with which, for example, variable resistances (potentiometers), see patent US Pat. No. 4,469,330, magnetoresistive sensors, see commercial patent G06F3 / 033 DD 253496, or position-sensitive optical full-area detectors, see commercial patent G06F3 / 033 DD 256935, used or proposed. Disadvantages of these solutions are the temperature and operating voltage dependence of the characteristics and manufacturing tolerances of the electronic components. Furthermore, in digital signal evaluation and shaping an analog-to-digital conversion is required, which is also subject to considerable drift phenomena. When using optical devices also an additional focusing of the light is necessary.

On the other hand, devices with digital signal generation are used. Thus, optoelectronic devices are primarily used which avoid the above disadvantages. However, all these solutions are based on the principle of incremental detection of the actuating signal, so that no position-dependent zero point is defined. The incremental evaluation requires a direction discriminator and an up / down counter to obtain a dom signal corresponding path. This principle is used in computer input devices, such as the mouse or similar assemblies, see G06F3 / 033 DE 3407131, DE 3506309, DE 3610591, DE 3543783, DE 3630007, DE 3711872, DE 3726939.

Object of the invention

The aim of the invention is to realize with a low component cost signal generation and processing. Furthermore, the mechanical complexity compared to previous solutions of control levers should be minimized.

Explanation of the essence of the invention

The object of the invention is to provide a device which is able to generate manual control signals absolutely digital.

In this case, temperature and operating voltage influences should be excluded.

Furthermore, a position-dependent zero position should be present.

According to the invention, this object is achieved in that after mechanical separation, the control movement of a control lever in two mutually orthogonal directions, the degree of the adjustment movement in both directions with optocouplers and an absolute digital binary code is determined.

embodiments

Figure 1 shows a manual lever for generating an absolutely digital signal. The adjustment movement achieved with the adjusting lever 6 is separated by the sliding mechanisms 4 and 5 in the x / y direction.

Another possibility of movement separation is shown in FIG. With optocouplers 2, a binary code 1, Figure 3, sampled and the signal is provided via a buffer 7 for disposal. The output signal is loaded for defined sampling by means of a clock track 9 at discrete times in the buffer 7. In doing so, processing

and Stollhebeltakt be asynchronous, without a falsification of the measured value by simultaneous reading and writing in

Intermediate memory 7 to cause, since the clock pulse is blocked by the reading unit 8 when reading the buffer. The Zero range is stretched for noise suppression. By spring forces 3, the lever 6 when not operated in the Zeroing held or returned. By a non-linear division of the binary code 1 to be scanned, a characteristic curve can be achieved. When using a computer for further signal processing in more complex systems is a cheap Signal supply without analog-to-digital conversion, or without additional signal processing (direction discriminator, counter)

reached. In addition, the time-critical pulse counting of the incremental measuring systems and the necessary detection of each are eliminated

Single pulse, especially at superimposed mechanical, higher-frequency vibrations. It will be a cost effective

and in the signal supply urd processing achieves a time- and effort-optimal solution.

Claims (4)

1. A method for controlling electro-hydraulic drives in mobile machines with hydrostatic drive and electrically controlled positioning, characterized in that after mechanical separation, the control movement of a control lever (6) in two mutually orthogonal directions the degree of movement in both directions with optocouplers (2 ) and an absolute digital binary code (1). 2. The method according to claim 1, characterized in that an absolutely digital binary code (1), which triggers the adjusting movement in forward and backward movement, used wirri. 3. The method according to claim 1, characterized in that an absolutely digital binary code (1) is used with a stretched zero range. 4. The method according to claim!, Characterized in that the actuating lever movement is separated via a ball or a universal joint in two mutually orthogonal rotary rotational directions of movement.