Self-feedback retarder pressure control valve group

Abstract

The utility model discloses a self-feedback type retarder pressure control valve bank which comprises a hydraulic element and a hydraulic system, the hydraulic element comprises a control valve bank, a force retarder and a heat exchanger, and the hydraulic system comprises a main oil channel, a control oil channel, a heat exchange oil channel, a retarder oil channel and a throttling oil channel. The control valve group comprises a proportional control electromagnetic valve, a pressure control valve and a switch valve; the main oil passage is communicated with the oil pump, the input port of the proportional control electromagnetic valve, the oil pump and the end III of the pressure control valve; according to the utility model, the effects of starting the retarder, controlling the pressure of the outlet of the retarder and discharging residual oil in the retarder are achieved through the simple control column valve group consisting of the three valve cores. The hydraulic control system is simple and visual, the complexity of the whole hydraulic control system is greatly reduced due to the structure without oil pumping and a small number of hydraulic elements, meanwhile, the occupied space needed by the corresponding hydraulic valve block is reduced, the fault rate of the whole hydraulic system is correspondingly reduced, and therefore the overall stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the retarder technical field, concretely relates to a self feedback type retarder pressure control valve group. BACKGROUND

[0002] The hydraulic control valve is an essential key execution element in the hydraulic control system, and the ultimate goal of control is realized by using oil pressure to transfer energy.

[0003] In the hydraulic control system, the three most important factors are wall, medium and energy. The wall can ensure that the liquid flows in the set space with the set flow rate and sealing state; the medium is usually different types of oil and air; and the energy can ensure that the liquid flows through the set place with the set pressure and flow rate.

[0004] Generally, the hydraulic control valve can be divided into three types for the purpose of reversing, pressure control and flow control. Among them, the reversing valve and the pressure control valve need to switch the position state of the valve core single or frequently to achieve the effect of reversing and pressure control, therefore, the valve core needs to have the ability to accept external signals and the ability to work according to different signal states. In most cases, feedback oil channel design or additional proportional solenoid valve is usually used as the driving energy source, so that the valve core can perform single or reciprocating piston movement.

[0005] The hydraulic retarder can be divided into three types: parallel, series and integrated.

[0006] The parallel type is independent of the vehicle transmission system and can be connected or disconnected at any time according to the demand.

[0007] The series type retarder is located between the transmission and the drive shaft, and can directly participate in the power transmission of the vehicle during work, but the braking torque is large.

[0008] The integrated retarder can be highly integrated with components such as the transmission, has the advantages of small space occupation and compact structure, etc.

[0009] On the market, the hydraulic control system of the hydraulic retarder is usually divided into various control systems with different states according to different types of demand forms, each has advantages and disadvantages, and is not universal between each other, and the use scene is relatively single. At the same time, the hydraulic control system used on the market is composed of one solenoid valve and three sets of control valve cores, and the hydraulic elements used are more, and the structure and control logic are more complex. SUMMARY

[0010] The self-feedback type retarder pressure control valve group solves the problems of more hydraulic elements used by the device in the prior art and complex structure and control logic.

[0011] In order to solve the above technical problems, the utility model discloses the following technical scheme: A self-feedback type retarder pressure control valve group, including hydraulic element and hydraulic system, the hydraulic element includes control valve group, and the hydraulic retarder and heat exchanger connected with the control valve group.

[0012] The hydraulic system includes main oil liquid oil channel, control oil channel, heat exchange oil channel and retarder oil channel.

[0013] The control valve group includes proportional control solenoid valve, pressure control valve and switch valve.

[0014] The main oil liquid oil channel is connected with the input port of the proportional control solenoid valve and the III end of the pressure control valve.

[0015] The output port of the proportional control solenoid valve is connected to the control oil channel cavity of the pressure control valve and switch valve through the control oil channel respectively.

[0016] The inlet end and outlet end of the heat exchanger are connected with the II end and IV end of the switch valve through the heat exchange oil channel respectively.

[0017] The inlet end of the hydraulic retarder is connected with the I end of the switch valve through the retarder oil channel.

[0018] The outlet end of the hydraulic retarder is connected with the V end of the switch valve and the I end of the pressure control valve through the retarder oil channel respectively.

[0019] The outlet end of the hydraulic retarder is also connected with the feedback oil channel of the pressure control valve through the throttle oil channel.

[0020] The III end of the switch valve is connected with the oil tank, and the II end of the pressure control valve is connected with the oil tank.

[0021] When being in the closed state: the V end of the switch valve is communicated with the III end, and the 1, 2 and IV ends are closed; the I end of the pressure control valve is communicated with the II end, and the III end is closed.

[0022] When being in the open state: the I end of the switch valve is communicated with the IV end, and the II end is communicated with the V end; the I end of the pressure control valve is communicated with the III end, and the II end is closed.

[0023] The utility model also has the following technical features:

[0024] The main oil passage comprises a first oil passage and a second oil passage, the first oil passage is communicated with the input port of the proportional control electromagnetic valve and the oil pump, and the second oil passage is communicated with the III end of the pressure control valve and the oil pump.

[0025] The control oil passage comprises a first control oil passage and a second control oil passage, the first control oil passage is communicated with the control oil passage cavity of the pressure control valve and the output port of the proportional control electromagnetic valve, and the second control oil passage is communicated with the control oil passage cavity of the switch valve and the output port of the proportional control electromagnetic valve.

[0026] The heat exchange oil passage comprises a first heat exchange oil passage and a second heat exchange oil passage, the first heat exchange oil passage is communicated with the inlet end of the heat exchanger and the II end of the switch valve, and the second heat exchange oil passage is communicated with the outlet end of the heat exchanger and the IV end of the switch valve.

[0027] The retarder oil passage comprises a first retarder oil passage and a second retarder oil passage, the first retarder oil passage is communicated with the inlet end of the hydraulic retarder and the I end of the switch valve, and the second retarder oil passage is communicated with the outlet end of the hydraulic retarder and the IV end of the switch valve, and is also communicated with the outlet end of the hydraulic retarder and the I end of the pressure control valve.

[0028] The hydraulic system further comprises a drain oil passage, the drain oil passage comprises a first drain oil passage and a second drain oil passage, the first drain oil passage is communicated with the II end of the pressure control valve and the oil tank, and the second drain oil passage is communicated with the III end of the switch valve and the oil tank.

[0029] The throttle oil passage is further provided with a throttle opening.

[0030] Compared with the prior art, the utility model has the following technical effects:

[0031] (I) the utility model provides a kind of self feedback type retarder pressure control valve group, and the control valve group formed by simple three valve cores is thereby reached the effect of opening retarder, control retarder outlet pressure, discharge residual oil in retarder.Easy, intuitive, the structure that will not appear oil channeling phenomenon and small amount of hydraulic element make the complexity degree of entire hydraulic control system greatly reduce, simultaneously reduce the space required by corresponding hydraulic valve block, and correspondingly reduce the failure rate of entire hydraulic system to improve overall stability.

[0032] (II) The utility model provides a kind of self feedback type retarder pressure control valve group, when corresponding hydraulic valve block is adapted, pressure control valve core, switch valve core and retarder can be integrated simultaneously, and a new retarder integrated module is formed, the matching installation position of proportion control solenoid valve, heat exchanger, oil input port is reserved outside module, integrated module can be more convenient to arrange, replace peripheral hydraulic element, convenient transportation and match different vehicle assembly needs.

[0033] (III) The utility model provides a kind of self feedback type retarder pressure control valve group, the oil liquid required by entire hydraulic system is derived from the main oil circuit oil liquid input port of external connection, input port can additionally design connecting device, so that entire retarder integrated module can be adapted to the vehicle of most demand retarder in market simultaneously, to reach the effect of universal for all vehicles, can further improve market share, reduce the maintenance and repair cost of post-sale, reduce the development cost of integrated module.

[0034] (IV) The utility model provides a kind of self feedback type retarder pressure control valve group, the setting of external heat exchanger can make entire hydraulic system share heat exchanger with vehicle or transmission, only needs additional tee pipe to communicate oil passage, to further reduce the procurement cost of integrated module, to greatly improve market competitiveness.

[0035] (V) The utility model provides a kind of self feedback type retarder pressure control valve group, due to the design principle of using only one proportion control solenoid valve, the position state switching of another 2 valve cores can be controlled simultaneously, and the operation process of retarder opening, closing, pressure control is exceptionally simple and easy to use. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the installation position schematic view of a kind of self feedback type retarder pressure control valve group of the utility model (hydraulic retarder closing state).

[0037] Figure 2 It is the installation position schematic view of a kind of self feedback type retarder pressure control valve group of the utility model (hydraulic retarder opening state).

[0038] Figure 3 It is the structure schematic view of switch valve core of the utility model (retarder closing state).

[0039] Figure 4 It is the structure schematic view of switch valve core of the utility model (retarder opening state).

[0040] Figure 5 It is the structure schematic view of pressure control valve core of the utility model (retarder closing state).

[0041] Figure 6 This is a schematic diagram of the valve core structure of the pressure control valve of the present invention—the retarder is in the open state.

[0042] The meanings of the labels in the attached diagram are as follows:

[0043] 1-Hydraulic component, 2-Hydraulic system, 3-Throttle opening.

[0044] 1-1 Control valve assembly, 1-2 Hydraulic retarder, 1-3 Heat exchanger.

[0045] 2-1 Main oil passage, 2-2 Control oil passage, 2-3 Heat exchange oil passage, 2-4 Retarder oil passage, 2-5 Throttling oil passage, 2-6 Drain oil passage.

[0046] 1-1-1 Proportional control solenoid valve, 1-1-2 Pressure control valve, 1-1-3 Switch valve.

[0047] 2-1-1 First oil circuit, 2-1-2 Second oil circuit.

[0048] 2-2-1 First control oil passage, 2-2-2 Second control oil passage.

[0049] 2-3-1 First heat exchange oil passage, 2-3-2 Second heat exchange oil passage.

[0050] 2-4-1 First retarder oil passage, 2-4-2 Second retarder oil passage.

[0051] 2-6-1 First oil drain passage, 2-6-2 Second oil drain passage.

[0052] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0053] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0054] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0055] Example 1:

[0056] This embodiment provides a self-feedback retarder pressure control valve assembly, such as... Figures 1-2 As shown, it includes a hydraulic component 1 and a hydraulic system 2. The hydraulic component 1 includes a control valve group 1-1, a hydraulic retarder 1-2 connected to the control valve group 1-1, and a heat exchanger 1-3.

[0057] The hydraulic system 2 comprises a main oil passage 2-1, a control oil passage 2-2, a heat exchange oil passage 2-3, a retarder oil passage 2-4 and a throttle oil passage 2-5.

[0058] The control valve group 1-1 comprises a proportional control electromagnetic valve 1-1-1, a pressure control valve 1-1-2 and a switch valve 1-1-3.

[0059] The main oil passage 2-1 is connected to an oil pump, an input port of the proportional control electromagnetic valve 1-1-1 and a III port of the pressure control valve 1-1-2, and the III port of the pressure control valve 1-1-2 corresponds to a main oil chamber M.

[0060] An output port of the proportional control electromagnetic valve 1-1-1 is connected to control oil chambers of the pressure control valve 1-1-2 and the switch valve 1-1-3 through the control oil passage 2-2.

[0061] As shown in the figure, a control oil chamber of the pressure control valve 1-1-2 corresponds to a first control oil passage 2-2-1 connected to the pressure control valve 1-1-2. Figure 1

[0062] A control oil chamber of the switch valve 1-1-3 corresponds to a second control oil passage 2-2-2 connected to the switch valve 1-1-3.

[0063] Inlets and outlets of the heat exchanger 1-3 are connected to II and IV ports of the switch valve 1-1-3 through the heat exchange oil passage 2-3.

[0064] An inlet of the hydraulic retarder 1-2 is connected to an I port of the switch valve 1-1-3 through the retarder oil passage 2-4.

[0065] An outlet of the hydraulic retarder 1-2 is connected to a V port of the switch valve 1-1-3 and an I port of the pressure control valve 1-1-2 through the retarder oil passage 2-4.

[0066] The outlet of the hydraulic retarder 1-2 is also connected to a feedback oil passage of the pressure control valve 1-1-2 through the throttle oil passage 2-5.

[0067] The III port of the switch valve 1-1-3 is connected to an oil tank, and the II port of the pressure control valve 1-1-2 is connected to the oil tank.

[0068] When in the closed state, the V port of the switch valve 1-1-3 is connected to the III port, and the I, II and IV ports are closed, and the I port of the pressure control valve 1-1-2 is connected to the II port, and the III port is closed.

[0069] When in the open state, the I port of the switch valve 1-1-3 is connected to the IV port, the II port is connected to the V port, the I port of the pressure control valve 1-1-2 is connected to the III port, and the II port is closed. ​

[0070] When the entire hydraulic system is connected to the vehicle or the transmission through the interface adapter, the high-pressure oil from the oil pump can be referred to as the main oil, which is divided into two paths when passing through the main oil passage 2-1:

[0071] The first path directly leads to the proportional control solenoid valve 1-1-1, and the input port oil of the proportional control solenoid valve 1-1-1 can precisely control the output port oil of the proportional control solenoid valve 1-1-1 according to the received electronic signal strength, so that the pressure of the output port oil precisely meets the design requirements.

[0072] The second path is connected to the pressure control valve 1-1-2, which is in communication with the III end of the pressure control valve 1-1-2, that is, the main oil passage M, and the main oil can pass through the position state switching of the pressure control valve 1-1-2 to reach the next hydraulic element.

[0073] In Figure 1 When the entire hydraulic system is connected to the vehicle or the transmission through the interface adapter, the high-pressure oil from the oil pump can be referred to as the main oil, which is divided into two paths when passing through the main oil passage 2-1:

[0074] One end of the valve core of the pressure control valve 1-1-2 in the moving direction is provided with a return spring S3, and in the absence of pressure oil at the other end, the valve core will be pushed to the end without spring due to the springback force of the spring.

[0075] The switch valve core of the switch valve 1-1-3 is provided with return springs S1 and S2 at both ends in the moving direction, wherein the spring S1 is at the same end as the control oil passage A1 of the electromagnetic valve, the spring S2 is at the other end, and the stiffness of the spring S1 needs to be less than that of the spring S2, so as to ensure that in the absence of pressure oil in the control oil passage A1, the valve core will be pushed to the S1 direction due to the springback force of the spring S2.

[0076] The utility model only needs 2 valve cores to form a control valve group to achieve the same control effect and precision as in other patents. The valve group in other patents is composed of 3 valve cores, so the cost, failure rate and stability are improved.

[0077] In order to achieve the above purpose, the switch valve core 1-1-3 is provided with springs with different stiffness at both ends in the working direction, which mainly functions to enable the valve core 1-1-3 to realize the functions of 2 valve cores in other patents alone.

[0078] Referring to Figure 3 The valve core structure of the switch valve 1-1-3 in the retarding device closed state is shown in the figure, which is a two-position three-way reversing valve, and the corresponding valve hole oil passage structure is also shown in the figure.

[0079] From the spring S1 to S2 direction in turn is solenoid valve control oil channel A1 (corresponding to the second control oil channel 2-2-2), the first retarder outlet oil channel R1 (corresponding to the second retarder oil channel 2-4-2), heat exchanger inlet oil channel P1, heat exchanger outlet oil channel P2, retarder inlet oil channel R2, first drain oil channel T1, second retarder outlet oil channel R3 (corresponding to the second retarder oil channel 2-4-2), and spring cavity drain oil channel X1.

[0080] When the retarder is in the closed state, only the second retarder outlet oil channel R3 is communicated with the first drain oil channel T1;When the retarder is in the closed state, referring to Figure 4 , the heat exchanger inlet oil channel P1 is communicated with the first retarder outlet oil channel R1, and the heat exchanger outlet oil channel P2 is communicated with the retarder inlet oil channel R2.

[0081] In order to meet the design requirements, the two ends of the spool of the switch valve 1-1-3 are respectively provided with springs S1 and S2, and the stiffness of the spring S1 needs to be smaller than the stiffness of the spring S2, so that when the solenoid valve control oil channel A1 has no oil pressure, the spool is in the closed state;When the solenoid valve control oil channel A1 has oil pressure, the pressure of the oil plus the spring force of the spring S1 can overcome the spring force of the spring S2, so that the spool moves to the open state position.

[0082] Because the oil channel layout of three spools in other patents is realized, the oil channel guided by the spool is adjusted, and the main oil channel difference point is 1-1-3 first. The other two five-way / six-way spools are adjusted to two three-way valves.

[0083] As a preferred embodiment of the present application:

[0084] The main oil channel 2-1 includes a first oil passage 2-1-1 and a second oil passage 2-1-2.

[0085] The first oil passage 2-1-1 is communicated with the input port of the proportional control solenoid valve 1-1-1 and the oil pump, and the second oil passage 2-1-2 is communicated with the III end of the pressure control valve 1-1-2 and the oil pump.

[0086] The control oil channel 2-2 includes a first control oil channel 2-2-1 and a second control oil channel 2-2-2.

[0087] The first control oil channel 2-2-1 is communicated with the output port of the proportional control solenoid valve 1-1-1 and the control oil channel cavity of the pressure control valve 1-1-2, and the second control oil channel 2-2-2 is communicated with the output port of the proportional control solenoid valve 1-1-1 and the control oil channel cavity of the switch valve 1-1-3.

[0088] The heat exchange oil channel 2-3 comprises a first heat exchange oil channel 2-3-1 and a second heat exchange oil channel 2-3-2.

[0089] The first heat exchange oil channel 2-3-1 is communicated with the inlet end of the heat exchanger 1-3 and the II end of the switch valve 1-1-3, and the second heat exchange oil channel 2-3-2 is communicated with the outlet end of the heat exchanger 1-3 and the IV end of the switch valve 1-1-3.

[0090] The retarder oil channel 2-4 comprises a first retarder oil channel 2-4-1 and a second retarder oil channel 2-4-2.

[0091] The first retarder oil channel 2-4-1 is communicated with the inlet end of the hydraulic retarder 1-2 and the I end of the switch valve 1-1-3, the second retarder oil channel 2-4-2 is communicated with the outlet end of the hydraulic retarder 1-2 and the IV end of the switch valve 1-1-3, and the outlet end of the hydraulic retarder 1-2 and the I end of the pressure control valve 1-1-2.

[0092] As a preferred embodiment of the present embodiment:

[0093] The hydraulic system 2 further comprises a drain oil channel 2-6.

[0094] The drain oil channel 2-6 comprises a first drain oil channel 2-6-1 and a second drain oil channel 2-6-2, the first drain oil channel 2-6-1 is communicated with the II end of the pressure control valve 1-1-2 and the oil tank, and the second drain oil channel 2-6-2 is communicated with the III end of the switch valve 1-1-3 and the oil tank.

[0095] As a preferred embodiment of the present embodiment:

[0096] The throttle oil channel 2-5 is further provided with a throttle opening 3.

[0097] The specific working process of the utility model:

[0098] Referring to Figure 2 , the whole retarder control hydraulic system is in an open state, the main oil liquid oil channel 2-1 divides the input oil liquid into two paths, the first oil path 2-1-1 is communicated with the input port oil channel of the proportional control electromagnetic valve 1-1-1, and the second oil path 2-1-2 is communicated with the control valve spool 3.

[0099] When the proportional control electromagnetic valve 1-1-1 receives a control electronic signal, the oil liquid pressure of the output port is adjusted according to the design, and the oil liquid is also divided into two paths with equal pressure, the first control oil channel 2-2-1 is communicated with the control oil channel cavity of the pressure control valve 1-1-2, and the second control oil channel 2-2-2 is communicated with the control oil channel cavity of the switch valve spool 4.

[0100] At the same time, the oil pressure of the first control oil passage 2-2-1 and the second control oil passage 2-2-2 needs to quickly overcome the elastic force of the springs S2 and S3, and the switch valve 1-1-3 preferentially switches the position state with the pressure control valve 1-1-2, that is, after the switch valve 1-1-3 is opened, the pressure control valve 1-1-2 is opened.

[0101] When the pressure control valve 1-1-2 switches to the open state, the oil in the second oil passage 2-1-2 can pass through the switch valve 1-1-3 and the first heat exchange oil passage 2-3-1 to the inlet of the heat exchanger 1-3.

[0102] The oil from the heat exchanger 1-3 passes through the switch valve 1-1-3 and the second heat exchange oil passage 2-3-2 to the inlet of the hydraulic retarder 1-2 through the first retarder oil passage 2-4-1.

[0103] The oil from the outlet of the hydraulic retarder 1-2 is divided into two paths and goes to the second retarder oil passage 2-4-2 and the throttle oil passage 2-5, respectively, and the throttle oil passage 2-5 is also provided with a throttle opening 3.

[0104] When the pressure (retarder outlet pressure) in the throttle oil passage 2-5 and the resultant force of the spring S3 are greater than the oil pressure of the first control oil passage 2-2-1, the pressure control valve 1-1-2 switches the position state again (for reference Figure 1 ), so that part of the oil in the second retarder oil passage 2-4-2 is guided to the oil drain opening through the pressure control valve 1-1-2, thereby achieving the effect of reducing the retarder outlet pressure.

[0105] Further, when the pressure value in the throttle oil passage 2-5 is lower than the expected value, the retarder pressure control valve 1-1-2 will switch to the open state again, thereby re-oiling and pressurizing the retarder.

[0106] When the retarder is in the closed state, only the second retarder outlet oil passage R3 is connected to the first oil drain oil passage T1; when the retarder is in the closed state, referring to Figure 4 , the heat exchanger inlet oil passage P1 is connected to the first outlet oil passage R1 of the retarder, and the heat exchanger outlet oil passage P2 is connected to the inlet oil passage R2 of the retarder.

[0107] In order to meet the design requirements, the two ends of the spool of the switch valve 1-1-3 are respectively provided with a spring S1 and a spring S2, and the stiffness of the spring S1 needs to be smaller than the stiffness of the spring S2, so that when there is no oil pressure in the electromagnetic valve control oil passage A1, the spool is in the closed state; when there is oil pressure in the electromagnetic valve control oil passage A1, the pressure of the oil plus the elastic force of the spring S1 can overcome the elastic force of the spring S2, so that the spool moves to the open state position.

[0108] Referring to Figure 5 , the structure diagram of the pressure control valve 1-1-2 in the retarding device closed state, the spool is a two-position two-way slide valve, and the corresponding valve hole oil way structure is also shown in the figure. From the side without spring to the direction of spring S3, the oil way layout is in turn the second electromagnetic valve control oil way A2 (corresponding to the first control oil way 2-2-1), the second drain oil way T2, the third retarding device outlet oil way R4, the main oil way oil way M, the third drain oil way T3, and the self feedback oil way X2 (corresponding to the throttle oil way 2-5). In the closed state, the third retarding device outlet oil way R4 is communicated with the second drain oil way T2; in the open state, referring to Figure 6 , the main oil way oil way M is communicated with the third retarding device outlet oil way R4. The spool needs to adjust the pressure value of the electromagnetic valve output (the first control oil way 2-2-1) according to the size of the retarding device outlet pressure value (the throttle oil way 2-5) at any time, and according to the force balance relationship of the feedback oil way pressure (the throttle oil way 2-5), the spring force of S3, and the electromagnetic valve control pressure (the first control oil way 2-2-1), the spool needs to frequently switch the closed state reciprocatingly, so as to achieve the effect of regulating the retarding device outlet pressure value.

[0109] The above technical scheme is only a relatively optimal specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can think of changes or replacements within the technical range disclosed by the present application without creative labor, which are all covered in the protection scope of the present application.

Claims

1. A self-feedback type retarder pressure control valve group comprising a hydraulic element (1) and a hydraulic system (2), said hydraulic element (1) comprising a control valve group (1-1), a hydraulic retarder (1-2) connected with the control valve group (1-1) and a heat exchanger (1-3), said hydraulic system (2) comprising a main oil passage (2-1), a control oil passage (2-2), a heat exchange oil passage (2-3), a retarder oil passage (2-4) and a throttle oil passage (2-5), characterized in that, The control valve group (1-1) comprises a proportional control electromagnetic valve (1-1-1), a pressure control valve (1-1-2) and a switch valve (1-1-3); The main oil liquid oil channel (2-1) is communicated with an oil pump, an input port of the proportional control electromagnetic valve (1-1-1) and a III end of the pressure control valve (1-1-2); An output port of the proportional control electromagnetic valve (1-1-1) is connected to control oil channel cavities of the pressure control valve (1-1-2) and the switch valve (1-1-3) through a control oil channel (2-2) in two ways; Inlet and outlet ends of the heat exchanger (1-3) are connected to a II end and a IV end of the switch valve (1-1-3) through a heat exchange oil channel (2-3); An inlet end of the hydraulic retarder (1-2) is connected to a I end of the switch valve (1-1-3) through a retarder oil channel (2-4) An outlet end of the hydraulic retarder (1-2) is connected to a V end of the switch valve (1-1-3) and a I end of the pressure control valve (1-1-2) through the retarder oil channel (2-4); The outlet end of the hydraulic retarder (1-2) is also connected to a feedback oil channel of the pressure control valve (1-1-2) through a throttle oil channel (2-5); A III end of the switch valve (1-1-3) is connected to an oil tank, and a II end of the pressure control valve (1-1-2) is connected to the oil tank; When in a closed state: a V end of the switch valve (1-1-3) is communicated with a III end, I end, II end and IV end are closed, a I end of the pressure control valve (1-1-2) is communicated with a II end, and a III end is closed; When in an open state: a I end of the switch valve (1-1-3) is communicated with a IV end, a II end is communicated with a V end, a I end of the pressure control valve (1-1-2) is communicated with a III end, and a II end is closed.

2. A pressure control valve group for a self-feedback type retarder according to claim 1, characterized in that, The main oil liquid oil channel (2-1) comprises a first oil path (2-1-1) and a second oil path (2-1-2); The first oil path (2-1-1) is communicated with an oil pump and an input port of the proportional control electromagnetic valve (1-1-1), and the second oil path (2-1-2) is communicated with the oil pump and a III end of the pressure control valve (1-1-2).

3. A pressure control valve group for a self-feedback brake retarder according to claim 2, characterized in that, The control oil channel (2-2) comprises a first control oil channel (2-2-1) and a second control oil channel (2-2-2); The first control oil channel (2-2-1) is communicated with an output port of the proportional control electromagnetic valve (1-1-1) and a control oil channel cavity of the pressure control valve (1-1-2), and the second control oil channel (2-2-2) is communicated with the output port of the proportional control electromagnetic valve (1-1-1) and a control oil channel cavity of the switch valve (1-1-3).

4. A pressure control valve group for a self-feedback brake retarder according to claim 3, characterized in that, The heat exchange oil channel (2-3) comprises a first heat exchange oil channel (2-3-1) and a second heat exchange oil channel (2-3-2); The first heat exchange oil channel (2-3-1) is communicated with an inlet end of the heat exchanger (1-3) and a II end of the switch valve (1-1-3), and the second heat exchange oil channel (2-3-2) is communicated with an outlet end of the heat exchanger (1-3) and a IV end of the switch valve (1-1-3).

5. A pressure control valve group for a self-feedback brake retarder according to claim 4, characterized in that The retarder oil passage (2-4) comprises a first retarder oil passage (2-4-1) and a second retarder oil passage (2-4-2). The first retarder oil passage (2-4-1) is communicated with the inlet end of the hydraulic retarder (1-2) and the I end of the switch valve (1-1-3), the second retarder oil passage (2-4-2) is communicated with the outlet end of the hydraulic retarder (1-2) and the IV end of the switch valve (1-1-3), and the outlet end of the hydraulic retarder (1-2) and the I end of the pressure control valve (1-1-2).

6. A pressure control valve group for a self-feedback brake retarder according to claim 2, characterized in that, The hydraulic system (2) further comprises a drain oil passage (2-6). The drain oil passage (2-6) comprises a first drain oil passage (2-6-1) and a second drain oil passage (2-6-2), the first drain oil passage (2-6-1) is communicated with the II end of the pressure control valve (1-1-2) and the oil tank, and the second drain oil passage (2-6-2) is communicated with the III end of the switch valve (1-1-3) and the oil tank.

7. A pressure control valve group for a self-feedback brake retarder according to claim 2, characterized in that, The throttle oil passage (2-5) is further provided with a throttle opening (3).

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