CN116022264A

CN116022264A - Auxiliary driving device of semitrailer, semitrailer and control method thereof

Info

Publication number: CN116022264A
Application number: CN202211672524.6A
Authority: CN
Inventors: 彭中源; 雷晓晓; 汪溢; 万俊; 张望
Original assignee: Special Vehicle Technology Center of Hubei Aerospace Technology Research Institute; Hubei Sanjiang Space Wanshan Special Vehicle Co Ltd
Current assignee: Special Vehicle Technology Center of Hubei Aerospace Technology Research Institute; Hubei Sanjiang Space Wanshan Special Vehicle Co Ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-04-28

Abstract

The application discloses auxiliary driving device of semitrailer and control method thereof relates to car train technical field, and the device includes: the power module is arranged on the semitrailer; the hydraulic driving module comprises a hydraulic control assembly, a free wheel valve assembly and a driving wheel assembly, wherein the power output end of the power module is connected with the hydraulic control assembly through the hydraulic control assembly, the hydraulic control assembly is used for driving the state switching of the free wheel valve assembly, and the free wheel valve assembly is used for controlling the driving wheel assembly to be in a driving state or a non-driving state; the control module is used for controlling the power module and the hydraulic driving module and realizing start-stop, driving control and braking control of the auxiliary driving device of the semitrailer; the power module is independent of the semi-tractor, and the control of the power module does not need to acquire a cooperative control signal of the tractor engine, so that the semi-trailer additionally provided with the auxiliary driving system has high interchangeability with the existing tractor on the market, and the power module has wide application range and good economical efficiency.

Description

Auxiliary driving device of semitrailer, semitrailer and control method thereof

Technical Field

The application relates to the technical field of automobile trains, in particular to an auxiliary driving device of a semitrailer, the semitrailer and a control method thereof.

Background

The automobile train is an important transport tool for land transportation, is particularly suitable for long-distance land transportation of heavy equipment such as crawler armored vehicles, engineering machinery and the like, and has the advantages of quick transportation reaction, flexible transportation route, large transportation quality, good economy and the like. An automotive train consists of a tractor and a trailer, typically carried by the tractor drive and the semitrailer. Along with the development of the diversification of the transportation working condition and the road condition, the development trend of adding an auxiliary driving system on the semitrailer is gradually formed for improving the climbing capacity and the low adhesion road surface trafficability of the automobile train. In order to improve economy, the driving system of the semitrailer is usually required to be driven in a non-full time mode, and the driving system of the semitrailer is started and closed according to driving conditions. Based on the driving characteristics of large torque of a hydraulic motor and flexible transmission characteristics of hydraulic arrangement, in the field of transportation of heavy equipment, a semi-trailer auxiliary driving system usually adopts hydraulic transmission, and does not adopt electric transmission or mechanical transmission.

Depending on the powertrain arrangement, common hydraulically-based semi-trailer auxiliary drive systems can be divided into two categories, non-freestanding and freestanding. The non-independent type is to share a set of power system with the tractor; the independent power system is arranged on the semi-trailer and independently provides power for the semi-trailer. Although the non-independent hydraulic transmission pipeline has the advantages of unified power system, relatively simple control design and good economy, the longer and thicker hydraulic transmission pipeline is not suitable for bridging arrangement between the tractor and the semitrailer, and has the disadvantages of relatively slow driving response, poor interchangeability with the tractor and the like. The independent type has the advantages of high interchangeability with the tractor, quick driving response and the like.

Whether the auxiliary driving system of the semi-trailer can be cooperated with the driving of the tractor is always a technical difficulty in the development of the auxiliary driving system of the semi-trailer, in particular to the auxiliary driving system of the semi-trailer with independent power system. The auxiliary drive system of the semitrailer can be divided into two types, namely active cooperative control and passive cooperative control according to whether the auxiliary drive cooperative control of the semitrailer depends on the input of a tractor engine, a speed or other related state signals. The active cooperative control system needs to acquire signals such as the engine speed or the vehicle speed of the tractor from the tractor to perform vehicle speed cooperative matching, so that the interchangeability of the semi-trailer and the tractor is poor, and the active cooperative control system is not suitable for matching use of the tractor and the semi-trailer with different models. And the signal precision of the vehicle speed signal is low, the control difficulty is higher, and the drive incompatibility is easy to occur. The passive cooperative control system can realize cooperative driving of the semitrailer and the tractor without acquiring cooperative control signals from the tractor, and further improves the interchangeability of the auxiliary driving semitrailer and the tractor. How to develop passive cooperative control systems is a serious challenge at present.

Disclosure of Invention

The utility model provides an aim at provides an auxiliary drive device and a semitrailer of semitrailer to solve the semitrailer of current area auxiliary drive function and tractor drive cooperative control to a certain extent and require height, drive cooperative difference and interchangeability poor technical problem.

In order to solve the technical problems, the application adopts the following technical scheme:

a first aspect of the present application provides an auxiliary drive device for a semitrailer, the auxiliary drive device comprising: the power module is arranged on the semitrailer; the hydraulic driving module comprises a hydraulic control assembly, a free wheel valve assembly and a driving wheel assembly, wherein the power output end of the power module is connected with the hydraulic control assembly through the hydraulic control assembly, the hydraulic control assembly is used for driving the state switching of the free wheel valve assembly, and the free wheel valve assembly is used for controlling the driving wheel assembly to be in a driving state or a non-driving state; and the control module is used for controlling the power module and the hydraulic driving module to realize start-stop, driving control and braking control of the auxiliary driving device of the semitrailer.

In some embodiments, the power module includes: the engine is used for providing power for the test hydraulic driving module; the transfer case is arranged at the power output end of the engine; the oil supply assembly is connected with the engine and is used for providing fuel for the engine; the air inlet assembly is connected with the engine and is used for providing air for internal combustion of the engine; the exhaust assembly is connected with the engine and is used for removing waste gas generated during combustion operation of the engine; and the cooling assembly is connected with the engine and is used for cooling the engine when the engine works.

In some embodiments, the hydraulic control assembly includes: the control oil circuit is used for driving the switching of the working state of the free wheel valve assembly; a drive oil circuit for providing pressurized oil to the freewheel valve assembly; and the oil tank is respectively connected with the control oil circuit and the driving oil circuit.

In some embodiments, the control oil path includes: the pilot valve is connected with the free wheel valve assembly through a control pipeline, and the pilot valve controls the on-off of a hydraulic control pipeline of the free wheel valve assembly so as to control the working state switching of the free wheel valve assembly; the gear pump is arranged at one power output port of the transfer case, the gear pump is connected with the pilot valve through an oil supply pipeline and is used for providing pressure oil for the pilot valve, and the gear pump is connected with the oil tank.

In some embodiments, the driving oil path includes: the driving pump is arranged at one power output port of the transfer case, is connected with the free wheel valve assembly through a first driving pipeline and a second driving pipeline, is used for providing pressure oil for the free wheel valve assembly and is connected with an oil tank; the unloading valve is respectively connected with the first driving pipeline and the second driving pipeline and is used for switching on and off between the driving pipeline and the oil return pipeline; the flushing valve is respectively connected with the first driving pipeline, the second driving pipeline and the oil tank and is used for driving hydraulic oil at the low pressure side to return to the oil tank through the oil return pipeline; the overflow valve is connected between the first driving pipeline and the second driving pipeline and used for limiting the highest working pressure of the driving oil way; the pressure sensors are arranged on two sides of the driving pump and are connected with the control module.

In some embodiments, the freewheel valve assembly includes: the control pipeline enters the plug-in logic valve through the plug-in throttle valve, the plug-in logic valve is connected with the driving wheel assembly through a first logic oil way and a second logic oil way, and the plug-in logic valve controls the working state of the driving wheel assembly by controlling the on-off of the first logic oil way and the second logic oil way.

In some embodiments, the driving wheel assembly comprises a wheel, a driving motor and a bidirectional speed limiting valve, wherein a power output end of the driving motor is connected with the wheel, the plug-in logic valve is connected with two ends of the driving motor through a first logic oil circuit and a second logic oil circuit, and the bidirectional speed limiting valve is respectively connected with the first logic oil circuit and the second logic oil circuit.

In some embodiments, the control module includes: the hardware control component is used for controlling the auxiliary device on hardware; and the software control component is used for controlling the auxiliary device in a program.

A second aspect of the present application provides a semitrailer, wherein the auxiliary driving device is arranged on the semitrailer, and a power module of the driving device is relatively independent from a power system of the tractor.

A third aspect of the present application provides a control method of a driving device of a semitrailer, the control method being used for the semitrailer, comprising the steps of:

acquiring a starting instruction:

starting an engine of the driving device in response to the start command;

selecting a driving direction and a driving speed gear required by driving through a direction gear switch;

according to the requirements of the driving road conditions, selecting a gear of the driving device through a pressure gear switch;

according to the driving requirement, controlling the engine speed through an accelerator, and stopping the driving device when the engine speed is between the starting speed and the idle speed; when the engine speed is higher than the starting speed, controlling the driving device to work and output power; when the main control unit receives a braking signal with a braking pedal, the driving device stops working; when the main control unit receives no braking signal with the braking pedal, the power output of the driving device is restored.

According to the technical scheme, the application has at least the following advantages and positive effects:

the auxiliary driving device of the semitrailer adopts hydraulic driving, has large driving force, and can greatly improve the climbing capacity of the automobile train on mountain road terrain; the power module is independent of the tractor, and the control of the power module does not need to acquire the rotating speed and the speed of an engine of the tractor or other cooperative signals, so that the semitrailer additionally provided with the auxiliary driving system and the existing tractor on the market have high interchangeability, wide application range and good economy.

According to the semitrailer, the auxiliary driving device driven by hydraulic pressure is arranged, so that the driving force is large, and the climbing capacity of an automobile train on mountain road topography can be greatly improved; the power module is independent of the tractor, and the control of the power module does not need to acquire the rotating speed and the speed of an engine of the tractor or other cooperative signals, so that the semitrailer additionally provided with the auxiliary driving system and the existing tractor on the market have high interchangeability, wide application range and good economy.

According to the control method of the driving device of the semitrailer, the auxiliary driving device driven by hydraulic pressure is arranged, so that the driving force is large, and the climbing capacity of an automobile train on mountain road topography can be greatly improved; the power module is independent of the semitrailer, and the driving cooperative control does not need to acquire the rotating speed and the vehicle speed or other cooperative signals of the engine of the tractor, so that the semitrailer additionally provided with the auxiliary driving system and the existing tractor on the market have high interchangeability, wide application range and good economy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an auxiliary driving device of a semitrailer according to an embodiment;

fig. 2 is a schematic structural view of a power module of an auxiliary driving device of a semitrailer according to an embodiment;

fig. 3 is a schematic structural view of a hydraulic driving module of an auxiliary driving device of a semitrailer according to an embodiment;

FIG. 4 is a schematic structural view of a freewheel valve assembly of a hydraulic drive module of an auxiliary drive device of a semi-trailer according to an embodiment;

FIG. 5 is a control frame diagram of a hydraulic control module of an auxiliary drive of a semi-trailer according to an embodiment;

fig. 6 is a control flow chart of a hydraulic drive module of an auxiliary drive device of a semitrailer according to an embodiment.

The reference numerals are explained as follows: 100. a power module; 110. an engine; 120. a transfer case; 130. an oil supply assembly; 140. an air intake assembly; 150. an exhaust assembly; 160. a cooling assembly; 200. a hydraulic drive module; 210. a freewheel valve assembly; 211. a first cartridge logic valve; 212. a second cartridge logic valve; 213. a third cartridge logic valve; 214. a fourth cartridge logic valve; 215. inserting a throttle valve; 202. an oil tank; 203. a pilot valve; 204. a gear pump; 205. driving a pump; 206. an unloading valve; 207. a flush valve; 208. an overflow valve; 209. a pressure sensor; 221. a wheel; 222. a drive motor; 223. a speed limiting valve; 300. a control module; 401. an oil supply line; 402. a control pipeline; 403. an oil return path; 404. a first drive line; 405. a second drive line; 406. a first logical oil path; 407. and a second logic oil path.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Please refer to fig. 1 and 2.

Fig. 1 and 2 are schematic structural views of an auxiliary driving device for a semitrailer according to an embodiment of the present application, and as shown in the drawings, the device includes: a power module 100 mounted to the semi-trailer; the hydraulic driving module 200 comprises a hydraulic control assembly, a free wheel valve assembly 210 and a driving wheel assembly, wherein the power output end of the power module 100 is connected with the hydraulic control assembly through the hydraulic control assembly, the hydraulic control assembly is used for driving the state switching of the free wheel valve assembly 210, and the free wheel valve assembly 210 is used for controlling the driving wheel assembly to be in a driving state or a non-driving state; the control module 300 is used for controlling the power module 100 and the hydraulic driving module 200 to realize start-stop, driving control and braking control of the auxiliary driving device of the semitrailer. The hydraulic drive is adopted, so that the driving force is large, and the climbing capacity of the automobile train on mountain road topography can be greatly improved; the power module 100 is independent of the semitrailer, so that the control of the power module 100 does not need to acquire an engine 110, a vehicle speed or other related signals of the semitrailer, and the semitrailer additionally provided with the auxiliary driving system and the existing tractor in the market have high interchangeability, wide application range and good economy.

Please refer to fig. 3;

in this embodiment, the power module 100 includes: an engine 110, said engine 110 for powering a pilot hydraulic drive module 200; a transfer case 120, said transfer case 120 being mounted to a power output end of said engine 110; an oil supply assembly 130 connected with the engine 110, wherein the oil supply assembly 130 is used for providing fuel for the engine 110; an intake assembly 140 coupled to the engine 110, the intake assembly 140 configured to provide air for combustion within the engine 110; an exhaust assembly 150 connected to the engine 110, the exhaust assembly 150 being configured to exhaust gas generated during combustion operation of the engine 110; and a cooling assembly 160 connected to the engine 110, wherein the cooling assembly 160 is used for cooling the engine 110 when the engine 110 is in operation.

In this embodiment, the hydraulic control assembly includes: a control oil path for driving the switching of the working state of the freewheel valve assembly 210; a driving oil path for supplying pressure oil to the freewheel valve assembly 210; the oil tank 202 is connected to the control oil passage and the drive oil passage, respectively.

In the implementation of this embodiment, the oil tank 202 is composed of a tank body and a filter, and the oil tank 202 is used for providing hydraulic oil for the hydraulic circuit operation and assisting the hydraulic circuit to dissipate heat.

In this embodiment, the oil tank 202 further includes an oil return path 403, and the oil return path 403 is used to recover the pressure oil of the control path, the driving path, and the freewheel valve assembly 210.

In this embodiment, the control oil passage includes:

the pilot valve 203 is connected with the freewheel valve assembly 210 through a control oil path, and the pilot valve 203 controls the on-off of a hydraulic control pipeline of the freewheel valve assembly 210 so as to control the working state switching of the freewheel valve assembly 210.

In the implementation process of this embodiment, the pilot valve 203 is a two-position three-way electromagnetic valve, the port B of the gear pump 204 is communicated with the port a of the pilot valve 203 through the oil supply pipeline 401, the port B of the pilot valve 203 is communicated with the port F of the freewheel valve assembly 210 through the control pipeline 402, and the port T of the pilot valve 203 is communicated with the oil return oil path 403. When the electromagnetic valve of the pilot valve 203 is powered on, the port A and the port B of the pilot valve 203 are communicated, and the pressure oil output by the gear pump 204 enters the port F of the freewheel valve after passing through the pilot valve 203, so as to control the freewheel valve assembly 210 to enter a driving working state. When the electromagnetic valve of the pilot valve 203 is not electrified, the port A and the port B of the pilot valve 203 are disconnected, the port B of the pilot valve 203 is communicated with the port T, so that the port F pressure oil of the freewheel valve assembly 210 is communicated with the oil return oil path 403 through the pilot valve 203, and the freewheel valve assembly 210 is further controlled to enter a non-driving state.

A gear pump 204 mounted at one of the power output ports of the transfer case 120, the gear pump 204 being connected to the pilot valve 203 via an oil supply line 401, the gear pump 204 being adapted to supply pressurized oil to the pilot valve 203, the gear pump 204 being connected to the oil tank 202.

In the implementation process of this embodiment, the port of the gear pump 204A is connected to the hydraulic oil tank 202, and the port of the gear pump 204B is connected to the port a of the pilot valve 203 via the oil supply line 401, so as to supply pressure oil to the pilot valve 203 to control the freewheel valve.

In this embodiment, the driving oil path includes:

a drive pump 205 mounted to one of the power outlets of the transfer case 120, the drive pump 205 being connected to the freewheel valve assembly 210 by a first drive line 404 and a second drive line 405, the drive pump 205 being adapted to provide pressurized oil to the freewheel valve assembly 210, the drive pump 205 being connected to the tank 202;

in the implementation process of this embodiment, the port a of the driving pump 205 is connected to the port a of the freewheel valve assembly 210 through the first driving pipeline 404, and the high pressure output from the port a of the driving pump 205 passes through the freewheel valve assembly 210 and drives the driving motor 222 forward through the first logic oil circuit 406; the port B of the driving pump 205 is connected with the port B of the freewheel valve through the second driving pipeline 405, and the high pressure output by the port B of the driving pump 205 passes through the freewheel valve assembly 210 through the second driving pipeline 405 and drives the driving motor 222 in the reverse direction through the second logic oil circuit 407; the S port of the driving pump 205 is connected with an oil suction port of the oil tank 202, so that the oil suction port of the oil supplementing pump is built in the driving pump 205, and hydraulic oil is supplemented to the first driving pipeline 404 and the second driving pipeline 405; the T port of the drive pump 205 is connected to the return port of the hydraulic tank 202 for return and overflow return of the internal discharge housing of the drive pump 205. Solenoid valves for adjusting the displacement and direction are provided in the drive pump 205 for realizing drive speed and drive direction control.

In this embodiment, a closed driving circuit is formed between the first driving pipeline 404 and the second driving pipeline 405, when the driving motor 222 is driven in the forward direction, the first driving pipeline 404 is a driving side, the second driving pipeline 405 is an oil return side, and when the driving motor 222 is driven in the reverse direction, the second driving pipeline 405 is a driving side, and the first driving pipeline 404 is an oil return side.

The unloading valve 206 is respectively connected with the first driving pipeline 404 and the second driving pipeline 405, and the unloading valve 206 is used for switching on and off between the driving pipeline and the oil return pipeline;

in the implementation process of this embodiment, the unloading valve 206 is a two-position two-way solenoid valve, the a port of the unloading valve 206 is communicated with the first driving pipeline 404, and the B port of the unloading valve 206 is communicated with the second driving pipeline 405. When the port a and the port B of the unloading valve 206 are connected, the first driving pipeline and the second driving pipeline are communicated, and the high pressure in the driving circuit is unloaded, so that the driving pump 205 is protected, and the driving system cannot be driven. When the port a and the port B of the unloading valve 206 are disconnected, the first drive line and the second drive line are disconnected, ensuring that the drive pump 205 provides the drive high pressure oil to the freewheel valve assembly 210.

A flushing valve 207 connected to the first drive line, the second drive line and the tank 202, respectively, the flushing valve 207 being configured to drive the low-pressure hydraulic oil back to the tank 202 through the return line;

in the implementation process of this embodiment, the flushing valve 207 is a two-position three-way hydraulic control valve, the a port of the flushing valve 207 is communicated with the first driving pipeline, the B port of the flushing valve 207 is communicated with the second driving pipeline 405, and the T port of the flushing valve 207 is communicated with the oil return path 403. When the hydraulic oil pump is driven in the forward direction, the first driving pipeline is driven at high pressure, the second driving pipeline is oil return at low pressure, the pressure of the opening A of the flushing valve 207 is higher than that of the opening B, the opening B of the flushing valve 207 is communicated with the opening T, and low-pressure oil of the third driving pipeline enters the oil return oil way 403 through the opening T of the flushing valve 207 and returns to the oil tank 202, so that the effects of cooling and filtering high-temperature hydraulic oil of the driving circuit are achieved. Similarly, when the third driving pipe is driven at high pressure, the first driving pipe is low-pressure oil return, the pressure of the opening of the flushing valve 207B is higher than that of the opening a, the opening of the flushing valve 207A is communicated with the opening T, and low-pressure oil of the first driving pipe enters the system oil return oil path 403 through the opening T of the flushing valve 207 and returns to the oil tank 202.

An overflow valve 208 connected between the first driving pipeline and the second driving pipeline for limiting the highest working pressure of the driving oil path;

in the implementation process of this embodiment, the a port of the relief valve 208 is connected to the first driving pipeline, the B port of the relief valve 208 is connected to the second driving pipeline, and the T port of the relief valve 208 is connected to the return oil path 403. When the pressure of the opening of the overflow valve 208A is higher than the set working pressure, the opening of the overflow valve 208A is communicated with the opening T, and high-pressure oil enters the oil return oil path 403, so that the working pressure of the first driving pipeline is not higher than the set driving pressure; when the pressure of the opening of the overflow valve 208B is higher than the set working pressure, the opening of the overflow valve 208B is communicated with the opening T, and high-pressure oil enters the oil return oil path 403, so that the working pressure of the three driving pipelines is not higher than the set driving pressure, and the effect of driving high-pressure protection is achieved.

The pressure sensors 209 are arranged on two sides of the driving pump 205, the pressure sensors 209 are connected with the control module 300, two pressure sensors 209 are arranged, and 2 pressure sensors 209 are respectively communicated with the first driving pipeline and the second driving pipeline.

Please refer to fig. 4:

in some embodiments, the freewheel valve assembly 210 includes: the plug-in logic valve and the plug-in throttle valve 215 enter the plug-in logic valve through the control oil way through the plug-in throttle valve 215, the plug-in logic valve is connected with the driving wheel assembly through a first logic oil way 406 and a second logic oil way 407, and the plug-in logic valve controls the working state of the driving wheel assembly through controlling the on-off of the first logic oil way 406 and the second logic oil way 407.

In the implementation process of this embodiment, the freewheel valve assembly 210 includes a first plug-in logic valve 211, a second plug-in logic valve 212, a third plug-in logic valve 213, a fourth plug-in logic valve 214, and a plug-in throttle 215, the pressure oil of the control pipeline 402 reaches the F ports of the 4 plug-in logic valves through the plug-in throttle 215, so that the a ports a and B ports of the first plug-in logic valve 211 and the third plug-in logic valve 213 are respectively communicated, the a ports a and B ports of the second plug-in logic valve 212 and the fourth plug-in logic valve 214 are respectively disconnected, so that the a port and AM port in the freewheel valve assembly 210 are respectively communicated, the B port of the freewheel valve assembly 210 is communicated with the BM port, and the freewheel valve assembly 210 enters a driving working state; the pressure oil in the control pipeline 402 is cut off, 4 plug-in logic valves are reset by springs, the ports A and B of the first plug-in logic valve 211 and the third plug-in logic valve 213 are disconnected, the ports A and B of the second plug-in logic valve 212 and the fourth plug-in logic valve 214 are disconnected, a first logic oil circuit 406 and a second logic oil circuit 407 in the freewheel valve assembly 210 are simultaneously disconnected, an AM port in the freewheel valve assembly 210 is communicated with a BM port and is communicated with the oil tank 202 through an oil return oil circuit 403, and the freewheel valve assembly 210 enters a non-driving state at the moment.

Please refer to fig. 3:

in this embodiment, the driving wheel assembly includes a wheel 221, a driving motor 222, and a bi-directional speed limiting valve 223, where a power output end of the driving motor 222 is connected to the wheel 221, the plug-in logic valve is connected to two ends of the driving motor 222 through a first logic oil path 406 and a second logic oil path 407, and the bi-directional speed limiting valve 223 is connected to the first logic oil path 406 and the second logic oil path 407, respectively.

In the specific implementation process of this embodiment, the driving motor 222 is a radial plunger motor, and has two working states of free wheel and driving, the driving state can realize low-speed high-torque running, and torque driving is realized in a lower power state; the freewheel state can realize high-speed follow-up running, satisfies the requirement of high-speed running of the automobile train, and the two working states are controlled and switched by the freewheel valve assembly 210.

In the implementation process of this embodiment, the bidirectional speed limiting valve 223 is located between the freewheel valve and the freewheel motor, and the bidirectional speed limiting valve is used for limiting the oil inlet flow of the freewheel motor, and protecting the motor from overspeed on the premise of meeting the highest driving speed, and simultaneously preventing the whole vehicle from losing driving due to the driving slip of part of the wheels 221.

Please refer to fig. 5:

in this embodiment, the control module 300 includes: the hardware control component is used for controlling the auxiliary device on hardware; and the software control component is used for controlling the auxiliary device in a program.

In this embodiment, the hardware control component includes:

the main control unit comprises a control box which is a micro control core unit, the control box is arranged in the semitrailer, and a controller, a relay and a wire connector are arranged in the control box.

The remote controller is arranged in the cab and is connected with the control box; the remote controller is a wireless remote controller with a wired function, is usually arranged in a tractor cab when in operation, is uniformly controlled by the tractor cab, and mainly controls a system switch, front-back direction switching, high-low speed gear switching, pressure gear switching, driving mode switching and the like of auxiliary driving of the semitrailer; the remote control also carries system status and alarm information display.

In other embodiments, the remote control may also be a wireless remote control.

And the actuator is mainly used for driving a displacement control electromagnet of the pump 205, an electromagnet of the pilot valve 203 and an electromagnet of the unloading valve 206, and is used for receiving an electric control signal and driving corresponding elements to work.

A sensor; the pressure sensor 209, which is mainly connected to the driving circuit, collects driving pressure information and provides a driving control system.

The distribution box is used for supplying power to the control box and the remote controller; the distribution box is provided with a contactor, a delay relay, a safety device and the like, and is a distribution core unit, preferably, the distribution box is also provided with a generator and a storage battery, and a power supply and distribution system formed by the distribution box supplies power for the control unit and the main control unit of the engine 110.

In this embodiment, the main control unit and the engine 110 exchange information through CAN communication, and the remote controller and the main control unit exchange information through CAN communication. Each sensor is input to the main control unit through a voltage analog signal. The main control unit controls the work of each electromagnetic valve through a current signal. The remote controller terminal and the remote controller receiver can be in wireless communication.

A second aspect of this embodiment provides a semitrailer, wherein the auxiliary driving device is provided on the semitrailer, and the power module of the driving device is relatively independent from the power system of the tractor itself.

Please refer to fig. 6.

A third aspect of the present application provides a control method of a driving device of a semitrailer, where the control method is used for the semitrailer, and the control method is a software control component of the driving device, and includes the following steps:

acquiring a starting instruction;

starting an engine of the driving device in response to the start command;

specifically, if the control system switch is turned on in a state that the semi-trailer emergency stop switch is turned off, the control system is electrified, and the control system enters a ready working state; if the system switch is closed, the system is closed. If the engine 110 start switch is turned on, the engine 110 starts; if the engine 110 start switch is turned off, the engine 110 is turned off. In an emergency, the emergency stop switch is turned on, the system can be turned off, and the power output can be turned off.

specifically, the direction switch selects the traveling direction and traveling speed required for driving, and the neutral position may be selected to set the freewheel valve 201 in the freewheel position, and the displacement of the drive pump 205 may be controlled to zero.

specifically, according to the road conditions of driving, the low-voltage, medium-voltage and high-voltage gears required by driving are selected through the pressure gear switch.

According to the driving requirement, controlling the engine speed through an accelerator, and stopping the driving device when the engine speed is between the starting speed and the idle speed; when the engine speed is higher than the starting speed, controlling the driving device to work and output power; when the main control unit receives a braking signal with a braking pedal, the driving device stops working; when the main control unit receives a braking signal with a braking pedal, the power output of the driving device is recovered;

in particular, the brake signal may be derived from a semitrailer brake light signal. The drive side and oil return side real-time pressure signals of the closed drive circuit are acquired by the drive pressure sensor 209. When the side pressure of the driving side and the side pressure of the oil return are less than or equal to the set value, judging that the driving pressure of the instantaneous driving vehicle speed is too low, and not meeting the driving output under the vehicle speed, and controlling the driving to stop, namely, automatically entering a free wheel state in overspeed and disengaging the driving; when the "drive side pressure-return side pressure > the set value", it is determined that the drive pressure of the instantaneous running vehicle speed can satisfy the running output, and the relevant drive control can be continued. The displacement of the driving pump 205 is regulated in real time through an autonomous PID controller so as to ensure that the real-time driving pressure of the system is constant near the target driving pressure value corresponding to the selected pressure gear; while the allowable power is inserted, perhaps with torque limiting control, to prevent overload stall of the engine 110 due to drive control overshoot. The stable driving pressure indicates that the semi-trailer and the tractor have good driving coordination and can stably provide required driving force for the tractor.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims

1. An auxiliary drive device for a semitrailer, comprising:

the power module is arranged on the semitrailer;

the hydraulic driving module comprises a hydraulic control assembly, a free wheel valve assembly and a driving wheel assembly, wherein the power output end of the power module is connected with the hydraulic control assembly through the hydraulic control assembly, the hydraulic control assembly is used for driving the state switching of the free wheel valve assembly, and the free wheel valve assembly is used for controlling the driving wheel assembly to be in a driving state or a non-driving state;

and the control module is used for controlling the power module and the hydraulic driving module to realize start-stop, driving control and braking control of the auxiliary driving device of the semitrailer.

2. An auxiliary drive for a semi-trailer as claimed in claim 1, wherein said power module comprises:

the engine is used for providing power for the test hydraulic driving module;

the transfer case is arranged at the power output end of the engine;

the oil supply assembly is connected with the engine and is used for providing fuel for the engine;

the air inlet assembly is connected with the engine and is used for providing air for internal combustion of the engine;

the exhaust assembly is connected with the engine and is used for removing waste gas generated during combustion operation of the engine;

and the cooling assembly is connected with the engine and is used for cooling the engine when the engine works.

3. An auxiliary drive for a semi-trailer as claimed in claim 2, wherein said hydraulic control assembly comprises:

the control oil circuit is used for driving the switching of the working state of the free wheel valve assembly;

a drive oil circuit for providing pressurized oil to the freewheel valve assembly;

and the oil tank is respectively connected with the control oil circuit and the driving oil circuit.

4. A semi-trailer auxiliary drive as set forth in claim 3, wherein said control oil path comprises:

the pilot valve is connected with the free wheel valve assembly through a control pipeline, and the pilot valve controls the on-off of a hydraulic control pipeline of the free wheel valve assembly so as to control the working state switching of the free wheel valve assembly;

the gear pump is arranged at one power output port of the transfer case, the gear pump is connected with the pilot valve through an oil supply pipeline and is used for providing pressure oil for the pilot valve, and the gear pump is connected with the oil tank.

5. A secondary drive arrangement for a semitrailer as claimed in claim 3, wherein the drive oil circuit comprises:

the driving pump is arranged at one power output port of the transfer case, is connected with the free wheel valve assembly through a first driving pipeline and a second driving pipeline, is used for providing pressure oil for the free wheel valve assembly and is connected with an oil tank;

the unloading valve is respectively connected with the first driving pipeline and the second driving pipeline and is used for switching on and off between the driving pipeline and the oil return pipeline;

the flushing valve is respectively connected with the first driving pipeline, the second driving pipeline and the oil tank and is used for driving hydraulic oil at the low pressure side to return to the oil tank through the oil return pipeline;

the overflow valve is connected between the first driving pipeline and the second driving pipeline and used for limiting the highest working pressure of the driving oil way;

the pressure sensors are arranged on two sides of the driving pump and are connected with the control module.

6. The auxiliary drive device for a semitrailer according to claim 4, wherein the freewheel valve assembly includes: the control pipeline enters the plug-in logic valve through the plug-in throttle valve, the plug-in logic valve is connected with the driving wheel assembly through a first logic oil way and a second logic oil way, and the plug-in logic valve controls the working state of the driving wheel assembly by controlling the on-off of the first logic oil way and the second logic oil way.

7. The auxiliary driving device of a semitrailer according to claim 6, wherein the driving wheel assembly comprises wheels, a driving motor and a two-way speed limiting valve, a power output end of the driving motor is connected with the wheels, the plug-in logic valve is connected with two ends of the driving motor through a first logic oil circuit and a second logic oil circuit, and the two-way speed limiting valve is connected with the first logic oil circuit and the second logic oil circuit respectively.

8. An auxiliary drive for a semi-trailer as claimed in claim 1, wherein said control module comprises:

the hardware control component is used for controlling the auxiliary device on hardware;

and the software control component is used for controlling the auxiliary device in a program.

9. A semitrailer provided with an auxiliary drive device according to any one of claims 1 to 8, wherein the power module of the drive device is independent of the power system of the tractor itself.

10. A control method of a drive device of a semitrailer for controlling the semitrailer as claimed in claim 9, characterized by comprising the steps of:

acquiring a starting instruction:

starting an engine of the driving device in response to the start command;