PTO protection and control system of tractor

Abstract

The utility model discloses a PTO protection and control system of a tractor. Comprising a first oil pressure sensor installed in a gearbox and used for monitoring oil pressure in real time, a second oil pressure sensor installed on a PTO output device and used for monitoring oil pressure in real time, a first rotating speed sensor installed on the PTO output device and a second rotating speed sensor installed on an engine. The angle sensor and the system controller are mounted on the working device; the first oil pressure sensor, the second oil pressure sensor, the first rotating speed sensor, the second rotating speed sensor and the angle sensor are in communication connection with the system controller and transmit received signals to the system controller. The system controller is electrically connected with the gearbox, the PTO output device and the engine and controls the gearbox, the PTO output device and the engine to work. The system can effectively solve the problems that the service life of a gearbox is short, teeth are broken and a PTO output shaft is damaged in an existing PTO power take-off system, and the operation reliability of a tractor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to tractor power output device field, concretely relates to a tractor PTO protection and control system. BACKGROUND

[0002] At present, the working mode of PTO force is basically adopted in the field of tractor, but no effective protection measures are formed, and many problems exist, such as: the gear oil pressure in the gearbox lacks detection, often causes insufficient lubrication due to low oil pressure, causes heating and slip film, the PTO still continues to work after the working device leaves the ground, causes the power output shaft to be damaged under the action of lateral force and other problems;The Chinese invention patent application with publication number CN 114572181 A discloses a tractor PTO control system and control method, the control system includes PTO control system, vehicle control system, signal detection system, PTO execution system, signal transmission system and display system. On the basis of the control system, the control method ensures that the PTO control system can work normally, including manual mode and automatic mode, the manual mode directly controls the PTO clutch, the automatic mode will automatically combine or open the clutch according to the change of lifting height, facilitates field work. In the clutch combination process, according to the target torque, the actual speed and the actual torque, the PID algorithm is used to calculate the request torque, and then the torque is converted into pressure, and then the pressure is converted into current to drive the electromagnetic valve to execute the clutch operation. The control method makes the request torque equal to the target torque through iteration, and the whole combination process is a slow change process, which can ensure that the agricultural implement works slowly, and improve the comfort of driving. Through the PTO brake switch, the PTO can be stopped immediately, and the safety of operation is ensured.

[0003] The above patent application only describes a PTO control method, which protects the PTO by detecting the lifting height of the working device, and other important influencing factors of the PTO system protection, such as the oil pressure detection in the gearbox and the transmission speed ratio, are not described. Therefore, it is necessary to develop a PTO protection and control system to prevent the tractor PTO output shaft and the tractor internal PTO power transmission parts from being damaged, so as to improve the reliability and prolong the service life of the PTO. UTILITY MODEL CONTENTS

[0004] In view of the above technical deficiencies, the utility model aims at providing a tractor PTO protection and control system, which can effectively solve the problems of low service life of gearbox, tooth damage and PTO output shaft damage existing in the existing PTO force taking system, and improve the operation reliability of the tractor.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] The utility model provides a tractor PTO protection and control system, including the first oil pressure sensor of real time monitoring oil pressure installed in gearbox, the second oil pressure sensor of real time monitoring oil pressure installed on PTO output device, the first rotating speed sensor of installing on PTO output device, the second rotating speed sensor of installing on engine, angle sensor and system controller are installed on working device,

[0007] The first oil pressure sensor, second oil pressure sensor, first rotating speed sensor, second rotating speed sensor, angle sensor are connected to the system controller, and the system controller receives the signals.

[0008] Preferably, the number of first oil pressure sensors is greater than or equal to 2, and the system controller takes the average value according to the received values.

[0009] Preferably, the number of second oil pressure sensors is greater than or equal to 2, and the system controller takes the average value according to the received values.

[0010] Preferably, the first oil pressure sensor, second oil pressure sensor, first rotating speed sensor, second rotating speed sensor, angle sensor are wirelessly connected to the system controller.

[0011] The system controller monitors the pressure of the first oil pressure sensor and the second oil pressure sensor in real time. When the pressure value exceeds the set limit, the system controller determines that the system is abnormal and automatically disconnects the PTO output device.

[0012] The system controller calculates the ratio of the second rotating speed sensor to the first rotating speed sensor in real time and compares it with the system setting value. When the difference exceeds ±10%, the system determines that it is abnormal and automatically disconnects the PTO.

[0013] When the value of the angle sensor exceeds the system setting limit, in order to avoid damage to the PTO output shaft due to lateral force, the system automatically disconnects the PTO output device.

[0014] The utility model discloses a beneficial effect lies in: this system through real -time monitoring the oil pressure in gearbox, ensure that gearbox will not because internal oil -lack, lubrication cooling failure, cause the gear tooth, slip film etc. Fault;Through real -time monitoring the speed of engine and PTO, can calculate the power take -off deceleration ratio simultaneously with system set deceleration ratio real -time comparison, when the over -difference exceeds the set value's ± 10%, the system determines that PTO is abnormally running, and automatically disconnects PTO output, and stops checking trouble removal and then starts again;Through the value of the angle sensor installed on the working device, when the angle sensor exceeds the set value, the system determines that the working device state is abnormal, to avoid the damage of transmission shaft by lateral force, and the system automatically disconnects PTO;Through the detection and control of the above -mentioned multiple conditions, PTO is effectively protected, and the reliability and life of PTO operation are greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, below description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0016] Fig. 1 A tractor PTO protection and control system provided by the utility model embodiment is shown in the figure;

[0017] Fig. 2 The control relationship diagram of gearbox, PTO output device, engine, working device and system controller.

[0018] Mark explanation:

[0019] 1, gearbox;1-1, first oil pressure sensor;2, PTO output device, 2-1, second oil pressure sensor;2-2, first speed sensor, 3, engine, 3-1, second speed sensor;4, working device;4-1, angle sensor;5, system controller. DETAILED DESCRIPTION

[0020] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] As Figs. 1-2 shown, the embodiment discloses a tractor PTO protection and control system,

[0022] The system comprises a first oil pressure sensor 1-1 installed in the gearbox 1 to monitor the oil pressure in real time, a second oil pressure sensor 2-1 installed on the PTO output device 2 to monitor the oil pressure in real time, a first rotation speed sensor 2-2 installed on the PTO output device 2, a second rotation speed sensor 3-1 installed on the engine 3, an angle sensor 4-1 installed on the working device 4, and a system controller 5;

[0023] The first oil pressure sensor 1-1, the second oil pressure sensor 2-1, the first rotation speed sensor 2-2, the second rotation speed sensor 3-1, and the angle sensor 4-1 are communicatively connected to the system controller 5 to transmit the received signals to the system controller 5, and the system controller 5 is electrically connected to the gearbox 1, the PTO output device 2, and the engine 3 and controls the operation thereof.

[0024] The first oil pressure sensor 1-1, the second oil pressure sensor 2-1, the first rotation speed sensor 2-2, the second rotation speed sensor 3-1, and the angle sensor 4-1 are wirelessly connected to the system controller 5.

[0025] The system controller 5 monitors the pressure of the first oil pressure sensor 1-1 and the second oil pressure sensor 2-1 in real time, and when the pressure value exceeds the set limit value, the system controller 5 determines that the system is abnormal and automatically disconnects the PTO output device 2.

[0026] The system controller 5 calculates the ratio of the second rotation speed sensor 3-1 to the first rotation speed sensor 2-2 in real time and compares it with the system set value, and when the difference exceeds ±10%, the system determines that it is abnormal and automatically disconnects the PTO.

[0027] When the value of the angle sensor 4-1 exceeds the system set limit value, in order to avoid damage to the PTO output shaft due to lateral force, the system automatically disconnects the PTO output device 2.

[0028] The system adds gearbox oil pressure and PTO oil pressure detection in the working state, and when the oil pressure in the gearbox is lower than the set protection value, the system controller determines that the working state of the gearbox is abnormal, the PTO is disconnected, and the purpose of protecting the PTO is achieved.

[0029] The system compares the ratio of the engine rotation speed to the PTO output rotation speed with the pre-set reduction ratio in real time, and when a difference occurs, the system automatically disconnects the PTO output, achieving the purpose of protecting the PTO.

[0030] The system monitors the position of the working device in real time through the angle sensor installed on the working device, and when the lifting height of the working device (electro-hydraulic lifting) exceeds the set limit, the system automatically disconnects the PTO output to avoid damage to the PTO transmission shaft due to lateral force caused by the working device lifting too high.

[0031] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A tractor PTO protection and control system, characterized by: The system comprises a first oil pressure sensor (1-1) installed in the gearbox (1) to monitor the oil pressure in real time, a second oil pressure sensor (2-1) installed on the PTO output device (2) to monitor the oil pressure in real time, a first rotation speed sensor (2-2) installed on the PTO output device (2), a second rotation speed sensor (3-1) installed on the engine (3), an angle sensor (4-1) installed on the working device (4), and a system controller (5); the first oil pressure sensor (1-1), the second oil pressure sensor (2-1), the first rotation speed sensor (2-2), the second rotation speed sensor (3-1), and the angle sensor (4-1) are communicatively connected to the system controller (5) to transmit the received signals to the system controller (5); and the system controller (5) is electrically connected to the gearbox (1), the PTO output device (2), and the engine (3) and controls the operation of the gearbox (1), the PTO output device (2), and the engine (3).

2. A tractor PTO protection and control system as claimed in claim 1, characterized in that: The number of the first oil pressure sensors (1-1) is greater than or equal to 2, and the system controller (5) takes the average value according to the received values.

3. A tractor PTO protection and control system as claimed in claim 1, characterized in that: The number of the second oil pressure sensors (2-1) is greater than or equal to 2, and the system controller (5) takes the average value according to the received values.

4. A tractor PTO protection and control system as claimed in claim 1, characterized in that: The first oil pressure sensor (1-1), the second oil pressure sensor (2-1), the first rotation speed sensor (2-2), the second rotation speed sensor (3-1), and the angle sensor (4-1) are wirelessly connected to the system controller (5).

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