DD145689A1 - CORRECTION DEVICE FOR AUTOMATIC STEERING IN SELF-PROPELLED AGRICULTURAL MACHINES - Google Patents

Description

Field of application of the invention.

Correction device for automatic steering on self-propelled agricultural machines for harvesting row plants, in particular maize, or for driving at the stock limit under different soil conditions.

Characteristic of the known technical solution

It is a device to automatic steering, as in DD-WP 97 341 known in which a sensing device detects the plant row with transducers and. as an electrical signal to an electronic control unit transmits. From this control unit, the wheels are controlled by a hydraulic actuator and thus steered the agricultural machine. This device has the disadvantage that favorable soil conditions are necessary for a consistently good control. In wet, greasy, marshy or sandy soil conditions, the accuracy of the steering is adversely affected and can lead to the failure of the control device in extreme cases. Reason for this is a constant rolling movement of the harvester, which esa a change in position . Although the rows of plants are running straight ahead »In the worst case, the steering correction is not sufficient to compensate the

To achieve the size of the transmitter signal corresponding change in position of the harvester. This leads to the uselessness of the entire automatic steering.

2iel of the invention

The invention has as its goal to provide a correction device which allows to compensate for the slip of the steered wheels depending on the ground conditions switching, whereby the automatic steering remains fully functional.

Explanation of the essence of the invention

The invention has the object to create a Korektureinrichtung for _a utomaticsearch steering, which ensures optimal tracking for all soil conditions, easy to use and universally applicable is "

Erfindungsgeinäß this is achieved by the fact that in the electrical part of a self-propelled agricultural machine evaluation switch between a transmitter, a desire and a Bückführgeber is arranged, which consists of at least one / each and a switch for several switching stages «Thereafter, an electronic controller, consisting consisting of totalizer, a three-point member and a circuit breaker, which is in communication with a hydraulic valve. The evaluation switch accepts the signal voltage transmitted by the transmitter and sends it to the totalizer depending on the set value. »A second line from the transmitter to the totalizer co-mises from the bridge feedback transmitter · At the electronic controller, the signal from the transmitter is once over the course of the inventory limit and on the other hand, the signal of the feedback generator on the respective position of the steered

Wheels on. In the summer, the sum of these two signals is formed and transmitted via a downstream three-point link to a circuit breaker * The circuit breaker amplifies the output from the three-point element discontinuous voltage signals in corresponding switching currents, through which the electromagnetic hydraulic valve is actuated »From the hydraulic valve, the wheels are adjusted accordingly the steering movement is corrected until the sum signal of both encoders equals Hull. In order to enable the automatic tracking of the harvester even on wet and greasy soils, the driver of the evaluation switching device sets a lower resistance. This makes a higher signal voltage of the transducers effective than in normal ground conditions. This higher voltage requires compensation This correction device has the advantage that with changing soil conditions always the appropriate values are set in order to achieve optimal guidance of the engine To reach harvester »

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings show: 30

1: a schematic representation of the steering automatic, Fig, 2: a functional diagram of the steering automatic »

On a self-propelled agricultural machine 1 is at a cutting. werk 2 a locking device 3 with a transmitter. 4

attached, which is located on a boom 5 of the cutting work 2 "via a signal line 6 with a coupling member 8 is the transmitter 4 with a population changeover switch. 7 connected * The evaluation switch 7, each with a resistor 9; 10 fitted, which via a switch 11 is switched on or off. From the switch is the Bev / sition switch 7, a controller 12 and a respective solenoid valve 13; 13 'downstream of a hydraulic valve 14 and a return fax 15. The hydraulic part of the hydraulic valve 14 is connected to a steering cylinder 16, which is located on a steering axle 17. The controller 12 is equipped with a summer _f 18, a three-point member 19 and a power switch 20 · From the circuit breaker 20, the solenoid valves 13; 13 * directly applied and the steering operation triggered by the hydraulic valve 14 ·

Claims (1)

Brfindungsanepruch Correction device for automatic steering on self-propelled agricultural machines by means of an electronic controller for receiving and amplifying the transmitter signal of a mechanical sensing device, characterized in that a evaluation switch (7) between a controller (12) and a transmitter (4) or a feedback transmitter (15 ) is arranged, which consists of a respective resistor (9; 10) and a switch (11) for at least two switching stages *