CN111038252A - PTO control method - Google Patents

Abstract

The invention discloses a PTO control method, and belongs to the field of PTO control. A PTO control method comprising the steps of: 1) judging whether the PTO function is enabled or not according to the engine state mark, and if so, entering the step 2); otherwise, continuing to wait for the enable signal; 2) entering a PTO off state; when the rotation speed of the PTO output end is less than a preset value or the time when the PTO is in a closed state exceeds preset time, entering step 3); 3) engaging the PTO brake; when receiving the work order of the PTO, entering the step 4); 4) disengaging the PTO brake and engaging the corresponding solenoid valve according to the operating command; entering a fault handling mode when the engagement is overtime or the friction work of the PTO clutch is greater than a set value; otherwise, entering step 5); 5) the PTO is opened and output is performed. The invention solves the problems that the agricultural machinery is easy to extinguish and damage the machinery and tools caused by improper operation.

Description

PTO control method

Technical Field

The invention belongs to the field of PTO control, and particularly relates to a PTO control method.

Background

In the use of large agricultural machinery at present, a tractor power take-off (i.e., PTO) is generally controlled by a mechanical joystick, which requires a very high experience from an operator and is in an active state without concerning parameters such as engine speed and transmission torque. If the working mode is adopted for a long time, damage can be caused to relevant parts of the PTO, so that a transmission line can not transmit power, and the PTO can not work normally. Neither a corresponding output logic judgment nor emergency treatment in case of failure can cause a series of problems, such as: unreasonable matching, poor operation effect, easy breakage of PTO shaft and the like.

Disclosure of Invention

The invention aims to solve the problems that an agricultural machine is easy to extinguish and damage is easily caused to the machine due to improper operation when a PTO works, and provides a PTO control method.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a PTO control method comprising the steps of:

1) judging whether the PTO function is enabled or not according to the engine state mark, and if so, entering the step 2); otherwise, continuing to wait for the enable signal;

2) entering a PTO off state;

when the rotation speed of the PTO output end is less than a preset value or the time when the PTO is in a closed state exceeds preset time, entering step 3);

3) engaging the PTO brake; when receiving the work order of the PTO, entering the step 4);

4) disengaging the PTO brake and engaging the corresponding solenoid valve according to the operating command;

entering a fault handling mode when the engagement is overtime or the friction work of the PTO clutch is greater than a set value;

otherwise, entering step 5);

5) the PTO is opened and output is performed.

Further, the step 5) also comprises the following operations:

when the rotation speed error of the PTO is larger than the sliding gear reference value, judging that the PTO is in a sliding state;

and entering a fault processing mode when the sliding state exceeds the preset time.

Further, the failure processing mode specifically includes:

the PTO brake is engaged and a stop signal is output.

Compared with the prior art, the invention has the following beneficial effects:

the PTO control method of the invention monitors the rotation speed of the PTO in real time, analyzes and judges whether the PTO reaches the maximum value under the gear condition when transmitting the torque, and can judge whether the clutch joint slides relatively or not, if so, the transmission route is cut off in time, and the PTO unit on the agricultural machinery is diagnosed by using the method, thereby improving the use efficiency; the invention solves the problems that the farm machinery is easy to extinguish and the machine tool is easy to damage due to insufficient experience of operators when the PTO works.

Furthermore, whether the clutch joint is in relative sliding or not can be judged, if the relative sliding occurs, the transmission route is cut off in time, the PTO unit on the agricultural machine is diagnosed by using the method, errors caused by data fluctuation are eliminated, and the anti-interference capability of the system is enhanced, so that the use efficiency of the PTO unit is improved.

Drawings

FIG. 1 is a flow chart of the present invention;

FIG. 2 is a block diagram of the control system of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The invention is described in further detail below with reference to the accompanying drawings:

the invention relates to a method for connecting a PTO torque input end and a torque output end of a gearbox by a plate type clutch, aiming at realizing the purpose of disconnecting the PTO end and the gearbox end at any time and protecting the input end of the PTO.

The flow chart of the PTO control method of the present invention is shown in fig. 1, and first is the input variables such as engine status flag, torque under grade control, PTO output speed (sensor), PTO input speed (engine), PTO clutch friction work, speed error;

judging whether the PTO function is enabled or not through the engine state mark, if not, returning to the previous step to wait for an enabling signal, and entering a PTO closing state when the enabling is carried out;

when the PTO is in a closed state, the PTO brake is automatically engaged when the rotating speed of the PTO output end is less than a set value or the PTO is in the closed state for more than a set time;

when a command requiring PTO operation is not received, the whole system can keep a braking state, and when the command requiring PTO operation is received, the system outputs an operation command to a PTO end and disengages PTO braking; engaging a corresponding electromagnetic valve according to a PTO gear required by a driver, then calculating to obtain whether the whole process is finished, judging that the output end has a fault when the PTO clutch is not engaged after the set time is exceeded, entering a fault processing mode, namely engaging a PTO brake, and outputting a stop signal; when the PTO works normally, comparing the input rotation speed error with a sliding gear reference value, and when the rotation speed error of the PTO is greater than the sliding gear reference value and exceeds the set time, entering a fault processing mode, engaging a PTO brake and outputting a stop signal; if the rotation speed value returns to normal within a specified time, the PTO keeps outputting in a normal working state.

The control system block diagram of the invention is shown in fig. 2, and the input signals are: engine state flag, torque under slope control, PTO output speed (sensor), PTO input speed (engine), PTO clutch friction work, speed error; the output signal is: PTO desired torque, PTO status, PTO control command. For the output of the PTO control system, the PTO expected torque is a numerical value obtained by looking up a table according to the input amount under the control of the input gradient; the PTO state output is the command output of the control system to the PTO end after judging the intention of the driver, if the control system is static and working, when the PTO end does not execute the corresponding command, the control system enters fault treatment. The system of the invention is divided into 3 gears in the working mode, namely 540E gear, 1000E gear and 1000E gear, and the gears are judged by button identification in a cab. The PTO brake command is intervened when the control system judges that the actuating mechanism has a fault, and belongs to forced braking; the PTO does not output the instruction when working normally, when the PTO control system judges that the PTO clutch is engaged overtime or a gear slipping occurs, the control system outputs a PTO braking instruction and controls the state of the PTO to be static.

The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.

Claims (3)

1. A PTO control method, characterized by comprising the steps of:

1) judging whether the PTO function is enabled or not according to the engine state mark, and if so, entering the step 2); otherwise, continuing to wait for the enable signal;

2) entering a PTO off state;

when the rotation speed of the PTO output end is less than a preset value or the time when the PTO is in a closed state exceeds preset time, entering step 3);

3) engaging the PTO brake; when receiving the work order of the PTO, entering the step 4);

4) disengaging the PTO brake and engaging the corresponding solenoid valve according to the operating command;

entering a fault handling mode when the engagement is overtime or the friction work of the PTO clutch is greater than a set value;

otherwise, entering step 5);

5) the PTO is opened and output is performed.

2. The PTO control method according to claim 1, wherein the step 5) further comprises the operations of:

when the rotation speed error of the PTO is larger than the sliding gear reference value, judging that the PTO is in a sliding state;

and entering a fault processing mode when the sliding state exceeds the preset time.

3. The PTO control method according to claim 1 or 2, characterized in that the failure handling mode is specifically:

the PTO brake is engaged and a stop signal is output.

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