A control method and control device for a high-viscosity oil retarder

Abstract

The application provides a control method and a control device for a high-viscosity oil retarder, comprising the following steps: in response to a received first gear engagement operation, determining a first retarder gear position of the high-viscosity oil retarder; then determining a first initial opening degree of a first flow control valve and a second initial opening degree of a second flow control valve according to the first retarder gear position; and by controlling the on-off electricity of a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, changing the pressure in a working cavity in the retarder body in the process of sucking or pumping the high-viscosity oil into the working cavity in the high-viscosity oil retarder body according to a target pump oil amount corresponding to the first initial opening degree and discharging the high-viscosity oil from the working cavity according to a target oil discharge amount corresponding to the second initial opening degree, so as to slow down the speed of the vehicle to a driving speed corresponding to the first retarder gear position. In this way, by controlling the on-off electricity of the electromagnetic valves and adjusting the opening degrees of the flow control valves, the pressure in the working cavity is adjusted, so that different braking effects are realized, and different braking requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle braking, in particular to a control method and control device of a high-viscosity oil retarder. BACKGROUND

[0002] Due to the large number of intersections and bus stops and large passenger flow on urban roads, buses often need to brake frequently; in mountainous areas, the roads are steep and there are many sharp turns, and medium and large-sized trucks and buses that travel on mountainous road sections for a long time also often need to brake. Under the condition of long-term and frequent work of the brake, the brake shoe is quickly worn, the service life of the brake friction plate is shortened, and the brake force is lost or the braking performance is greatly reduced due to brake thermal recession, which is one of the main reasons for traffic accidents. Therefore, it is necessary to equip an auxiliary braking system.

[0003] The high-viscosity oil retarder is an auxiliary braking component of a vehicle using high-viscosity oil as a working medium, which reduces the load of the original vehicle braking system by acting on the transmission system of the original vehicle, so as to uniformly slow down the vehicle and improve the reliability of the vehicle braking system, prolong the service life of the braking system, and greatly reduce the use cost of the vehicle.

[0004] However, the high-viscosity oil retarder is different from the traditional retarder (such as an electric eddy current retarder), and its control principle and method are completely different, and the control structure is more complex. Therefore, the existing control method of the high-viscosity oil retarder cannot meet the control requirements of applying the high-viscosity oil retarder for vehicle braking. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a control method and control device of a high-viscosity oil retarder, which can adjust the pressure in the working chamber by controlling the on-off electricity of each electromagnetic valve in the high-viscosity oil retarder and adjusting the opening degree of the flow control valve, so as to achieve different braking effects and meet different vehicle braking requirements.

[0006] The embodiment of the present application provides a control method of a high-viscosity oil retarder, the high-viscosity oil retarder comprising a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a first flow control valve, a second flow control valve and a high-viscosity oil retarder body; the control method comprises:

[0007] In response to a received first gear engagement operation, a first retarder gear position of the high-viscosity oil retarder is determined;

[0008] A first initial opening degree of the first flow control valve is determined according to the first retarder gear position, and the first flow control valve is controlled to open to the first initial opening degree, so as to adjust the pump oil amount of the variable pump in the high-viscosity oil retarder to a target pump oil amount corresponding to the first initial opening degree;

[0009] determining a second initial opening degree of the second flow control valve according to the first retarding gear, and controlling the second flow control valve to open to the second initial opening degree to adjust an oil outlet amount of the working chamber in the high viscosity oil retainer body to a target oil outlet amount corresponding to the second initial opening degree;

[0010] According to the control strategy corresponding to the first retarding gear, by controlling the on-off electricity of the first electromagnetic valve, the second electromagnetic valve, and the third electromagnetic valve, and the on-off electricity of the second flow control valve, in the process of pumping or pumping out the high viscosity oil into or out of the working chamber in the high viscosity oil retainer body according to the target oil pumping amount and discharging the high viscosity oil from the working chamber according to the target oil outlet amount, the pressure in the working chamber in the high viscosity oil retainer body is changed to slow down the speed of the vehicle to the driving speed corresponding to the first retarding gear.

[0011] Further, when the first gear engagement operation is the first gear engagement operation of the high viscosity oil retainer in the no-load state, according to the control strategy corresponding to the first retarding gear, by controlling the on-off electricity of the first electromagnetic valve, the second electromagnetic valve, and the third electromagnetic valve, and the on-off electricity of the second flow control valve, in the process of pumping or pumping out the high viscosity oil into or out of the working chamber in the high viscosity oil retainer body according to the target oil pumping amount and discharging the high viscosity oil from the working chamber according to the target oil outlet amount, the pressure in the working chamber in the high viscosity oil retainer body is changed to slow down the speed of the vehicle to the driving speed corresponding to the first retarding gear, comprising:

[0012] According to the control strategy corresponding to the first retarding gear, the first electromagnetic valve and the third electromagnetic valve are controlled to be de-energized, and the second electromagnetic valve is controlled to be energized.

[0013] The energization duration of the second electromagnetic valve and the pressure in the working chamber in the high viscosity oil retainer body are monitored.

[0014] When the monitored energization duration of the second electromagnetic valve exceeds the preset duration and the pressure in the working chamber in the high viscosity oil retainer body is greater than the first pressure lower limit value, or when the monitored energization duration of the second electromagnetic valve does not exceed the preset duration and the pressure in the working chamber in the high viscosity oil retainer body is greater than the first pressure upper limit value, the third electromagnetic valve is controlled to be energized, in the process of pumping or pumping out the high viscosity oil into or out of the working chamber in the high viscosity oil retainer body according to the target oil pumping amount and discharging the high viscosity oil from the working chamber according to the target oil outlet amount, the pressure in the working chamber in the high viscosity oil retainer body is changed to slow down the speed of the vehicle to the driving speed corresponding to the first retarding gear.

[0015] Further, the control method further comprises:

[0016] In response to the received second gear engagement operation, determining a second retarding gear position of the high-viscosity oil retarder;

[0017] Controlling the first flow control valve to open to a first target opening degree indicated by the second retarding gear position;

[0018] According to the increase and decrease gear relationship between the first retarding gear position and the second retarding gear position, determining a second target opening degree of the second flow control valve; by controlling the on-off electricity of the first electromagnetic valve and the third electromagnetic valve, high-viscosity oil is sucked into or extracted from the working cavity in the high-viscosity oil retarder body according to the target oil pumping amount corresponding to the first target opening degree, and high-viscosity oil is discharged from the working cavity according to the target oil discharging amount corresponding to the second target opening degree, so as to change the pressure in the working cavity in the high-viscosity oil retarder body, and the current driving speed of the vehicle is retarded to the driving speed corresponding to the second retarding gear position.

[0019] Further, according to the increase and decrease gear relationship between the first retarding gear position and the second retarding gear position, determining a second target opening degree of the second flow control valve; by controlling the on-off electricity of the first electromagnetic valve and the third electromagnetic valve, high-viscosity oil is sucked into or extracted from the working cavity in the high-viscosity oil retarder body according to the target oil pumping amount corresponding to the first target opening degree, and high-viscosity oil is discharged from the working cavity according to the target oil discharging amount corresponding to the second target opening degree, so as to change the pressure in the working cavity in the high-viscosity oil retarder body, and the current driving speed of the vehicle is retarded to the driving speed corresponding to the second retarding gear position, comprising:

[0020] When the retarding gear position of the second retarding gear position is increased compared with the first retarding gear position, the second target opening degree of the second flow control valve is determined to be zero; the first electromagnetic valve is controlled to be de-energized, and the third electromagnetic valve is controlled to be energized, so that high-viscosity oil is sucked into the working cavity in the high-viscosity oil retarder body according to the target oil pumping amount corresponding to the first target opening degree, and high-viscosity oil is discharged from the working cavity according to the target oil discharging amount corresponding to the second target opening degree, so as to change the pressure in the working cavity in the high-viscosity oil retarder body, and the current driving speed of the vehicle is retarded to the driving speed corresponding to the second retarding gear position;

[0021] determining a second target opening degree of the second flow control valve as a predetermined opening degree when the second retarder gear is lower than the first retarder gear; controlling the first electromagnetic valve to be powered on and the third electromagnetic valve to be powered off, so as to draw high-viscosity oil out of a working cavity in the high-viscosity oil retarder body according to a target pump oil amount corresponding to the first target opening degree and discharge the high-viscosity oil out of the working cavity according to a target oil discharge amount corresponding to the second target opening degree, thereby changing the pressure in the working cavity in the high-viscosity oil retarder body and slowing down the current driving speed of the vehicle to a driving speed corresponding to the second retarder gear.

[0022] Further, the control method further comprises:

[0023] in response to the received neutral operation, controlling the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be powered off, and controlling the first flow control valve and the second flow control valve to be opened, so that the high-viscosity oil retarder is in the idle state.

[0024] Further, the first flow control valve and the second flow control valve are electromagnetic proportional valves.

[0025] The embodiments of the present application also provide a control device of a high-viscosity oil retarder, the high-viscosity oil retarder comprising a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a first flow control valve, a second flow control valve and a high-viscosity oil retarder body; the control device comprising:

[0026] a first determination module configured to determine a first retarder gear of the high-viscosity oil retarder in response to a received first gear engagement operation;

[0027] a first control module configured to determine a first initial opening degree of the first flow control valve according to the first retarder gear, and control the first flow control valve to be opened to the first initial opening degree, so as to adjust a pump oil amount of a variable pump in the high-viscosity oil retarder to a target pump oil amount corresponding to the first initial opening degree;

[0028] a second control module configured to determine a second initial opening degree of the second flow control valve according to the first retarder gear, and control the second flow control valve to be opened to the second initial opening degree, so as to adjust an oil discharge amount of a working cavity in the high-viscosity oil retarder body to a target oil discharge amount corresponding to the second initial opening degree;

[0029] The third control module is configured to, according to the control strategy corresponding to the first retarding gear position, control the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be turned on or turned off, change the pressure in the working cavity in the high-viscosity oil retainer body in the process of pumping or pumping out the high-viscosity oil into or out of the working cavity of the high-viscosity oil retainer body according to the target oil pumping amount and discharging the high-viscosity oil from the working cavity according to the target oil discharging amount, and slow down the speed of the vehicle to the driving speed corresponding to the first retarding gear position.

[0030] Further, when the first gear engagement operation is the first gear engagement operation of the high-viscosity oil retainer in the unloaded state, the third control module is configured to, when the third control module is used to, according to the control strategy corresponding to the first retarding gear position, control the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve to be turned on or turned off, change the pressure in the working cavity in the high-viscosity oil retainer body in the process of pumping or pumping out the high-viscosity oil into or out of the working cavity of the high-viscosity oil retainer body according to the target oil pumping amount and discharging the high-viscosity oil from the working cavity according to the target oil discharging amount, and slow down the speed of the vehicle to the driving speed corresponding to the first retarding gear position, the third control module is configured to:

[0031] According to the control strategy corresponding to the first retarding gear position, the first electromagnetic valve and the third electromagnetic valve are controlled to be turned off, and the second electromagnetic valve is controlled to be turned on.

[0032] The second electromagnetic valve is monitored for the duration of the power-on and the pressure in the working cavity of the high-viscosity oil retainer body.

[0033] When the monitored duration of the power-on of the second electromagnetic valve exceeds the preset duration and the pressure in the working cavity of the high-viscosity oil retainer body is greater than the first pressure lower limit value, or when the monitored duration of the power-on of the second electromagnetic valve does not exceed the preset duration and the pressure in the working cavity of the high-viscosity oil retainer body is greater than the first pressure upper limit value, the third electromagnetic valve is controlled to be turned on, the pressure in the working cavity in the high-viscosity oil retainer body is changed in the process of pumping or pumping out the high-viscosity oil into or out of the working cavity of the high-viscosity oil retainer body according to the target oil pumping amount and discharging the high-viscosity oil from the working cavity according to the target oil discharging amount, and the speed of the vehicle is slowed down to the driving speed corresponding to the first retarding gear position.

[0034] Further, the control device further comprises a gear adjusting module; the gear adjusting module is configured to:

[0035] In response to the received second gear engagement operation, the second retarding gear position of the high-viscosity oil retainer is determined.

[0036] The first flow control valve is controlled to be opened to the first target opening degree indicated by the second retarding gear position.

[0037] determining a second target opening degree of the second flow control valve according to the increase and decrease gear relationship between the first and second speed reduction gears; controlling the first and third electromagnetic valves to suck or discharge the high viscosity oil into or out of the working cavity of the high viscosity oil retarder body according to the target pump oil amount corresponding to the first target opening degree and the target discharge oil amount corresponding to the second target opening degree, so as to change the pressure in the working cavity of the high viscosity oil retarder body, and reduce the current driving speed of the vehicle to the driving speed corresponding to the second speed reduction gear.

[0038] Further, when the gear adjusting module is used to determine a second target opening degree of the second flow control valve according to the increase and decrease gear relationship between the first and second speed reduction gears; control the first and third electromagnetic valves to suck or discharge the high viscosity oil into or out of the working cavity of the high viscosity oil retarder body according to the target pump oil amount corresponding to the first target opening degree and the target discharge oil amount corresponding to the second target opening degree, so as to change the pressure in the working cavity of the high viscosity oil retarder body, and reduce the current driving speed of the vehicle to the driving speed corresponding to the second speed reduction gear, the gear adjusting module is used to:

[0039] when the speed reduction gear of the second speed reduction gear is increased compared with the first speed reduction gear, determining the second target opening degree of the second flow control valve as zero; controlling the first electromagnetic valve to be powered off and the third electromagnetic valve to be powered on, so as to suck the high viscosity oil into the working cavity of the high viscosity oil retarder body according to the target pump oil amount corresponding to the first target opening degree and discharge the high viscosity oil out of the working cavity according to the target discharge oil amount corresponding to the second target opening degree, so as to change the pressure in the working cavity of the high viscosity oil retarder body, and reduce the current driving speed of the vehicle to the driving speed corresponding to the second speed reduction gear;

[0040] when the speed reduction gear of the second speed reduction gear is reduced compared with the first speed reduction gear, determining the second target opening degree of the second flow control valve as a predetermined opening degree; controlling the first electromagnetic valve to be powered on and the third electromagnetic valve to be powered off, so as to discharge the high viscosity oil out of the working cavity of the high viscosity oil retarder body according to the target pump oil amount corresponding to the first target opening degree and discharge the high viscosity oil out of the working cavity according to the target discharge oil amount corresponding to the second target opening degree, so as to change the pressure in the working cavity of the high viscosity oil retarder body, and reduce the current driving speed of the vehicle to the driving speed corresponding to the second speed reduction gear.

[0041] Further, the control device further comprises: an idle adjusting module; the idle adjusting module is used to:

[0042] In response to the received neutral operation, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are controlled to be powered off, and the first flow control valve and the second flow control valve are controlled to be opened, so that the high-viscosity oil retarder is in the idle state.

[0043] Further, the first flow control valve and the second flow control valve are electromagnetic proportional valves.

[0044] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is run by a processor to execute the steps of the control method.

[0045] The embodiment of the present application provides a control method and a control device of a high-viscosity oil retarder. In response to a received first gear engagement operation, a first retardation gear position of the high-viscosity oil retarder is determined. A first initial opening degree of the first flow control valve is determined according to the first retardation gear position, and the first flow control valve is controlled to be opened to the first initial opening degree, so that a pump oil amount of a variable pump in the high-viscosity oil retarder is adjusted to a target pump oil amount corresponding to the first initial opening degree. A second initial opening degree of the second flow control valve is determined according to the first retardation gear position, and the second flow control valve is controlled to be opened to the second initial opening degree, so that an oil outlet amount of a working cavity in a high-viscosity oil retarder body is adjusted to a target oil outlet amount corresponding to the second initial opening degree. According to a control strategy corresponding to the first retardation gear position, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are controlled to be powered on or powered off, so that, in the process of absorbing or discharging the high-viscosity oil into or out of the working cavity in the high-viscosity oil retarder body according to the target pump oil amount and discharging the high-viscosity oil out of the working cavity according to the target oil outlet amount, the pressure in the working cavity in the high-viscosity oil retarder body is changed, so that the speed of the vehicle is retarded to a driving speed corresponding to the first retardation gear position.

[0046] In this way, the pressure in the working cavity can be adjusted by controlling the power-on or power-off of the electromagnetic valves in the high-viscosity oil retarder and adjusting the opening degree of the flow control valve, so that different braking effects can be achieved to meet different vehicle braking requirements.

[0047] In order to make the above objectives, characteristics and advantages of the present application more apparent and understandable, the following preferred embodiments are specifically described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0049] Figure 1 One of the flowcharts of the control method of the high-viscosity oil retarder provided by the embodiments of the present application is shown;

[0050] Figure 2 The structural schematic diagram of the high-viscosity oil retarder provided by the embodiments of the present application is shown;

[0051] Figure 3 The circuit connection schematic diagram of the control device adjusting the opening degree of the flow control valve provided by the embodiments of the present application is shown;

[0052] Figure 4 The second flowchart of the control method of the high-viscosity oil retarder provided by the embodiments of the present application is shown;

[0053] Figure 5 The structural schematic diagram of the control device of the high-viscosity oil retarder provided by the embodiments of the present application is shown;

[0054] Figure 6 The structural schematic diagram of the control device of the high-viscosity oil retarder provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, every other embodiment obtained by those skilled in the art without creative labor belongs to the scope of the present application.

[0056] Firstly, the application scenarios applicable to the present application are introduced. The present application can be applied to the field of vehicle braking technology.

[0057] The research shows that due to the large number of urban road intersections, dense bus stops and large passenger flow, the bus often needs to brake frequently; the mountainous road is steep and has many sharp turns, and the medium and large trucks and buses that have been driving on the mountainous road section for a long time also often need to brake. Under the condition of long-term and frequent work of the brake, the brake shoe is quickly worn, the service life of the brake friction plate is shortened, and the brake force is lost or the braking performance is greatly reduced due to brake thermal recession, which also becomes one of the main reasons for traffic accidents. Therefore, it is necessary to be equipped with an auxiliary braking system.

[0058] The high-viscosity oil retarder is an auxiliary braking component of a vehicle using high-viscosity oil as a working medium. The high-viscosity oil retarder reduces the load of the original vehicle braking system by acting on the transmission system of the original vehicle, so as to uniformly slow down the vehicle, improve the reliability of the vehicle braking system, prolong the service life of the braking system, and greatly reduce the use cost of the vehicle.

[0059] However, the high-viscosity oil retarder is different from the traditional retarder (such as an eddy current retarder), and the control principle and method are completely different, and the control structure is more complex. Therefore, the existing control method of the high-viscosity oil retarder cannot meet the control requirements of the vehicle braking using the high-viscosity oil retarder.

[0060] Based on this, the embodiments of the present application provide a control method and a control device of a high-viscosity oil retarder, so as to adjust the pressure in the working chamber by controlling the on-off electricity of each electromagnetic valve in the high-viscosity oil retarder and adjusting the opening degree of the flow control valve, thereby realizing different braking effects and meeting different vehicle braking requirements.

[0061] Please refer to Figure 1 and Figure 2 , Figure 1 a flowchart of a control method of a high-viscosity oil retarder provided by the embodiments of the present application, Figure 2 a structural schematic diagram of a high-viscosity oil retarder provided by the embodiments of the present application. As shown in Figure 2 the high-viscosity oil retarder provided by the embodiments of the present application includes a first electromagnetic valve 1, a second electromagnetic valve 2, a third electromagnetic valve 3, a first flow control valve 4, a second flow control valve 5 and a high-viscosity oil retarder body 6; the high-viscosity oil retarder provided by the embodiments of the present application further includes a variable pump 7, an oil inlet one-way valve 8, an oil storage cavity 9 and a plate heat exchanger 10.

[0062] As Figure 2As shown, the first end of the variable pump 7 is connected to the oil storage cavity 9 through the first electromagnetic valve 1; the second end of the variable pump 7 is connected to the third end of the variable pump 7 through the flow control valve; the third end of the variable pump 7 is connected to the retarding mechanical device of the high-viscosity oil retarder body 6 through the second electromagnetic valve 2 and the third electromagnetic valve 3; the variable pump 7 is also connected to the second flow control valve 5; the high-viscosity oil retarder body 6 is connected to the oil storage cavity 9 through the oil inlet check valve 8; and the third electromagnetic valve 3 is connected to the oil inlet check valve 8.

[0063] Specifically, Figure 2 The first electromagnetic valve 1, the second electromagnetic valve 2, the third electromagnetic valve 3 and the first flow control valve 4 are shown in the communication relationship when power is off. Specifically, the first electromagnetic valve 1 is connected to the oil storage cavity 9 when power is off, the second electromagnetic valve 2 is connected to the oil storage cavity 9 when power is off, and the third electromagnetic valve 3 is connected to the high-viscosity oil retarder body 6 when power is off; accordingly, according to Figure 2 , the first electromagnetic valve 1 is connected to the high-viscosity oil retarder body 6 when power is on, the second electromagnetic valve 2 is connected to the third electromagnetic valve 3 when power is on, and the third electromagnetic valve 3 is connected to the oil inlet check valve 8 when power is on.

[0064] The control method provided by the embodiment of the application can be applied to a control device. Exemplarily, the control device can be a single-chip microcomputer. The control device is electrically connected to the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the first flow control valve and the second flow control valve, respectively, to control the power-on and power-off of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve. Here, the first flow control valve and the second flow control valve are electromagnetic proportional valves, and the control device can control the valve opening degree of the first flow control valve and the second flow control valve, respectively.

[0065] Please refer to Figure 3 , Figure 3 The control device provided by the embodiment of the application is a circuit connection schematic diagram for adjusting the opening degree of the flow control valve. As Figure 3 shown in the embodiment of the application, the circuit of the control device comprises: a control circuit A, voltage regulating circuits B1, …, Bn, driving circuits C1, …, Cn, predetermined electromagnetic valves D1, …, Dn, sampling circuits E1, …, En and a power supply circuit F. Here, n is a positive integer greater than or equal to 1.

[0066] The predetermined electromagnetic valves D1,..., Dn include a first flow control valve and a second flow control valve; the power supply circuit F provides a stable working power supply for other circuits of the control device; the control circuit A controls the voltage regulation circuits B1,..., Bn and adjusts the current flowing through the predetermined electromagnetic valves D1,..., Dn through the driving circuits C1,..., Cn, so as to adjust the opening degree of the predetermined electromagnetic valves D1,..., Dn; the sampling circuits E1,..., En are respectively used to collect the current flowing through the predetermined electromagnetic valves D1,..., Dn, and feed back the collected current values of the predetermined electromagnetic valves D1,..., Dn to the control circuit A to form a closed-loop control.

[0067] Please refer to Figure 1 As shown in Figure 1 The control method provided by the embodiment of the application includes:

[0068] S101, in response to the received first gear shifting operation, determining a first retarding gear of the high-viscosity oil retarder.

[0069] Here, the retarding gears include a constant speed gear, a first retarding gear,..., and an Nth retarding gear; wherein N is a positive integer greater than or equal to 1; from the Nth retarding gear to the constant speed gear, the retarding gears decrease in turn. Different retarding gears have different retarding requirements. For example, the constant speed gear requires that the vehicle speed be maintained substantially unchanged; the first retarding gear to the fourth retarding gear require the vehicle speed to decrease by 25%, 50%, 75%, and 100% respectively within a preset retarding time.

[0070] S102, determining a first initial opening degree of the first flow control valve according to the first retarding gear, and controlling the first flow control valve to open to the first initial opening degree, so as to adjust the pump oil amount of the variable pump in the high-viscosity oil retarder to a target pump oil amount corresponding to the first initial opening degree.

[0071] Here, the valve opening degree can be represented in the form of percentage; for example, the first initial opening degree of the first flow control valve is 100%, which means that the first flow control valve is fully opened.

[0072] In this step, the first initial opening degree corresponding to the first retarding gear can be determined according to a pre-stored mapping relationship between the retarding gears and the valve opening degrees; in one possible implementation, the first initial opening degrees of the first flow control valve corresponding to different retarding gears are different; specifically, the first initial opening degree can be set to be larger when the retarding gear is higher, so as to increase the pump oil amount of the variable pump in the high-viscosity oil retarder, more quickly establish the pressure in the working chamber of the high-viscosity oil retarder, and then more quickly realize vehicle braking.

[0073] S103. Determine the second initial opening degree of the second flow control valve according to the first retarding gear, and control the second flow control valve to open to the second initial opening degree, so as to adjust the oil output of the working chamber in the high viscosity oil retarder body to the target oil output degree corresponding to the second initial opening degree.

[0074] The second flow control valve is used to control the oil output of the working chamber in the high viscosity oil retarder body. Specifically, when the second initial opening of the second flow control valve is 0, the second flow control valve is closed, the oil outlet of the working chamber in the high viscosity oil retarder body is closed, and the target oil output is 0.

[0075] S104. According to the control strategy corresponding to the first retarder position, by controlling the on and off of the first solenoid valve, the second solenoid valve and the third solenoid valve, during the process of drawing high viscosity oil into or drawing high viscosity oil out of the working chamber of the high viscosity oil retarder body according to the target pumping oil volume and discharging high viscosity oil from the working chamber according to the target output oil volume, the pressure in the working chamber of the high viscosity oil retarder body is changed, so as to slow the vehicle speed to the driving speed corresponding to the first retarder position.

[0076] In one possible implementation, when the first gear engagement is the first gear engagement of the high-viscosity oil retarder in an unloaded state, step S104 includes:

[0077] S1041. According to the control strategy corresponding to the first slow gear, control the first solenoid valve and the third solenoid valve to be de-energized, and control the second solenoid valve to be energized.

[0078] The no-load state is also known as the gearless state. When the high-viscosity oil retarder is in the no-load state, it does not produce a braking effect. It should be noted that when the high-viscosity oil retarder is in the no-load state, and the control device receives the first gear engagement operation, the first retarding gear corresponding to this gear engagement operation must be an increase in the retarding gear compared to the current gearless state.

[0079] Here, when the first gear engagement operation is the first gear engagement operation of the high viscosity oil retarder in the no-load state, the high viscosity oil retarder cannot start normal braking work immediately in the initial stage of gear engagement. It is necessary to first control the second solenoid valve to be energized and control the third solenoid valve to be energized within a preset time to replenish the oil.

[0080] The first solenoid valve controls the oil source for the variable pump during pumping. Specifically, when the first solenoid valve is de-energized, the variable pump pumps oil from the reservoir, drawing high-viscosity oil into the working chamber of the high-viscosity oil retarder body according to the target pumping volume. When the first solenoid valve is energized, the variable pump pumps oil from the working chamber, extracting high-viscosity oil from the working chamber of the high-viscosity oil retarder body according to the target pumping volume. The second and third solenoid valves control the output flow direction of the variable pump; the second solenoid valve controls whether the variable pump output is to the reservoir or the third solenoid valve; the third solenoid valve controls the retarder to replenish oil.

[0081] S1042. Monitor the energization duration of the second solenoid valve and the pressure in the working chamber of the high-viscosity oil retarder body.

[0082] S1043. When the energization time of the second solenoid valve exceeds a preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first lower pressure limit, or when the energization time of the second solenoid valve does not exceed the preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first upper pressure limit, the third solenoid valve is energized. During the process of drawing high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume and discharging high-viscosity oil from the working chamber according to the target output oil volume, the pressure in the working chamber of the high-viscosity oil retarder body is changed to slow the vehicle speed to the driving speed corresponding to the first retarding gear.

[0083] In one possible implementation, the control device is electrically connected to a pressure sensor in the high viscosity oil retarder to obtain the pressure within the working chamber of the high viscosity oil retarder body as measured by the pressure sensor.

[0084] The preset duration can be preset and adjusted by the user according to the actual working conditions of the vehicle through the control device. For example, the preset time can be 1 second, but this application does not limit it.

[0085] Here, if the first pressure value is greater than the first pressure upper limit within the preset time period, the control device controls the third solenoid valve to be energized in advance, and then enters the gear-increasing state; if the third solenoid valve is energized for a longer period than the preset time period, and the first pressure value is still less than the first preset pressure upper limit, it indicates that the high viscosity oil retarder has malfunctioned, and the control device controls the first solenoid valve, the second solenoid valve and the third solenoid valve to be de-energized, and the high viscosity oil retarder stops working; the control device outputs a fault alarm signal, and the control device can be connected to an alarm light, and the alarm light can be controlled to flash to provide fault prompts to the user through the fault alarm signal.

[0086] During the process of replenishing oil for lubrication while the third solenoid valve is de-energized, the second flow control valve is fully open, meaning the valve opening is 100%. When the oil replenishment is complete and the shift is in the boost mode, the second flow control valve is fully closed, meaning the valve opening is 0 and the target oil output is 0, in order to quickly build up the pressure in the working chamber.

[0087] Furthermore, when the first gear engagement is not the first gear engagement of the high-viscosity oil retarder under no-load conditions, that is, when the high-viscosity oil retarder is already in a certain retarding gear before receiving the first gear engagement, the opening of the first flow control valve can be adjusted from the original opening corresponding to the original retarding gear to the first initial opening indicated by the first retarding gear; then, according to the increase / decrease relationship between the first retarding gear and the second retarding gear, the second initial opening of the second flow control valve is determined, and the opening of the second flow control valve is adjusted from the original opening corresponding to the original retarding gear to the second initial opening indicated by the second retarding gear; high-viscosity oil is drawn into or extracted from the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume corresponding to the first initial opening, and high-viscosity oil is discharged from the working chamber according to the target output oil volume corresponding to the second initial opening, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body, thereby adjusting the retarding gear of the high-viscosity oil retarder and slowing the vehicle speed to the driving speed corresponding to the first retarding gear.

[0088] Please refer to the following: Figure 4 , Figure 4 This is a second flowchart illustrating a control method for a high-viscosity oil retarder provided in an embodiment of this application. Figure 4 As shown in the embodiments of this application, the control method includes:

[0089] S101. In response to the received first gear engagement operation, determine the first retarding gear of the high viscosity oil retarder.

[0090] S102. Determine the first initial opening of the first flow control valve according to the first retarding gear, and control the first flow control valve to open to the first initial opening, so as to adjust the pumping oil volume of the variable pump in the high viscosity oil retarder to the target pumping oil volume corresponding to the first initial opening.

[0091] S103. Determine the second initial opening degree of the second flow control valve according to the first retarding gear, and control the second flow control valve to open to the second initial opening degree, so as to adjust the oil output of the working chamber in the high viscosity oil retarder body to the target oil output degree corresponding to the second initial opening degree.

[0092] S104. According to the control strategy corresponding to the first retarder position, by controlling the on and off of the first solenoid valve, the second solenoid valve and the third solenoid valve, during the process of drawing high viscosity oil into or drawing high viscosity oil out of the working chamber of the high viscosity oil retarder body according to the target pumping oil volume and discharging high viscosity oil from the working chamber according to the target output oil volume, the pressure in the working chamber of the high viscosity oil retarder body is changed, so as to slow the vehicle speed to the driving speed corresponding to the first retarder position.

[0093] The descriptions of S101 to S104 can refer to the foregoing content and achieve the same technical effect, so they will not be repeated here.

[0094] S105. In response to the received second gear engagement operation, determine the second retarding gear of the high viscosity oil retarder.

[0095] During vehicle operation, the user may adjust the retarding gear of the high viscosity oil retarder at any time by shifting gears; therefore, the second retarding gear of the high viscosity oil retarder can be determined based on the received second gear shifting operation.

[0096] Here, the second slow gear can be either an upshift or a downshift relative to the first slow gear; for example, upshifting from slow gear three to slow gear four, or downshifting from slow gear four to constant speed gear.

[0097] S106. Control the first flow control valve to open to the first target opening degree indicated by the second slow speed position.

[0098] S107. Based on the gear ratios of the first and second retarder gears, determine the second target opening of the second flow control valve; by controlling the on / off state of the first and third solenoid valves, high-viscosity oil is drawn into or extracted from the working chamber of the high-viscosity oil retarder body according to the target pumping volume corresponding to the first target opening, and high-viscosity oil is discharged from the working chamber according to the target output volume corresponding to the second target opening, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body and slowing the vehicle's current driving speed to the driving speed corresponding to the second retarder gear.

[0099] In one possible implementation, step S107 includes:

[0100] S1071. When the retarding level of the second retarding gear increases compared to the first retarding gear, the second target opening of the second flow control valve is determined to be zero; the first solenoid valve is de-energized and the third solenoid valve is energized, so that high-viscosity oil is drawn into the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening and high-viscosity oil is discharged from the working chamber according to the target output oil volume corresponding to the second target opening, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body and slowing the current driving speed of the vehicle to the driving speed corresponding to the second retarding gear.

[0101] In this step, the second target opening is zero, and the target oil output corresponding to the second target opening is also zero. Therefore, when the retarding gear of the second retarding gear increases, the first solenoid valve is de-energized, and high viscosity oil is drawn into the working chamber of the high viscosity oil retarder body according to the target pump oil output corresponding to the first target opening. At the same time, the oil outlet pipe of the working chamber is closed, and the working chamber does not discharge oil outward, so that the pressure in the working chamber rises rapidly and the retarding gear increases.

[0102] S1072. When the retarding level of the second retarding gear is lower than that of the first retarding gear, the second target opening degree of the second flow control valve is determined to be a predetermined opening degree; the first solenoid valve is energized and the third solenoid valve is de-energized, so that high viscosity oil is extracted from the working chamber of the high viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening degree and high viscosity oil is discharged from the working chamber according to the target output oil volume corresponding to the second target opening degree, thereby changing the pressure in the working chamber of the high viscosity oil retarder body and slowing the current driving speed of the vehicle to the driving speed corresponding to the second retarding gear.

[0103] In this step, the second target opening is a predetermined opening, which corresponds to a certain target oil output. The oil outlet pipe of the working chamber in the high viscosity oil retarder body has a certain opening, and the working chamber can discharge oil outward. Therefore, when the retarding level of the second retarding level decreases, the first solenoid valve is energized, and the high viscosity oil is drawn out of the working chamber of the high viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening. At the same time, the working chamber discharges oil outward at a certain output, so that the pressure in the working chamber gradually decreases and the retarding level decreases.

[0104] In one possible implementation, the control method further includes:

[0105] In response to the received neutral operation, the first solenoid valve, the second solenoid valve and the third solenoid valve are de-energized, and the first flow control valve and the second flow control valve are opened, so that the high viscosity oil retarder is in the no-load state.

[0106] During vehicle operation, the user may also engage neutral to adjust the high-viscosity oil retarder to an unloaded state (no gear). In response to the received neutral operation, the first, second, and third solenoid valves are de-energized to keep the high-viscosity oil retarder in the unloaded state, and the high-viscosity oil retarder does not generate braking effect. At the same time, the first and second flow control valves are opened to allow the high-viscosity oil in the working chamber to be discharged as quickly as possible.

[0107] This application provides a control method for a high-viscosity oil retarder, comprising: responding to a received first gear engagement operation, determining a first retarding gear of the high-viscosity oil retarder; determining a first initial opening of a first flow control valve based on the first retarding gear, and controlling the first flow control valve to open to the first initial opening to adjust the pumping oil volume of the variable pump in the high-viscosity oil retarder to a target pumping oil volume corresponding to the first initial opening; determining a second initial opening of a second flow control valve based on the first retarding gear, and controlling the second flow control valve to open to the second initial opening to adjust the pumping oil volume of the variable pump in the high-viscosity oil retarder to a target pumping oil volume corresponding to the first initial opening; and determining a second initial opening of a second flow control valve based on the first retarding gear, and controlling the second flow control valve to open to the second initial opening to adjust the pumping oil volume of the variable pump in the high-viscosity oil retarder to a target pumping oil volume corresponding to the first initial opening. The oil output of the working chamber in the high-viscosity oil retarder body is adjusted to the target oil output corresponding to the second initial opening. According to the control strategy corresponding to the first retarding gear, by controlling the on / off power of the first solenoid valve, the second solenoid valve, and the third solenoid valve, and the opening and closing power of the second flow control valve, the pressure in the working chamber of the high-viscosity oil retarder body is changed during the process of drawing high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume and discharging high-viscosity oil from the working chamber according to the target oil output, so as to slow the vehicle speed to the driving speed corresponding to the first retarding gear.

[0108] In this way, by controlling the on / off state of each solenoid valve in the high-viscosity oil retarder and adjusting the opening of the flow control valve, the pressure in the working chamber is adjusted, thereby achieving different braking effects and meeting different vehicle braking needs.

[0109] Please see Figure 5 , Figure 6 , Figure 5 This is one of the structural schematic diagrams of a control device for a high-viscosity oil retarder provided in an embodiment of this application. Figure 6 This is a second schematic diagram of the control device for a high-viscosity oil retarder provided in an embodiment of this application. The high-viscosity oil retarder includes: a first solenoid valve, a second solenoid valve, a third solenoid valve, a first flow control valve, a second flow control valve, and a high-viscosity oil retarder body;

[0110] like Figure 5 As shown, the control device 400 includes:

[0111] The first determining module 410 is used to determine the first retarding gear of the high viscosity oil retarder in response to the received first gear engagement operation;

[0112] The first control module 420 is used to determine the first initial opening degree of the first flow control valve according to the first retarding gear, and control the first flow control valve to open to the first initial opening degree so as to adjust the pumping oil quantity of the variable pump in the high viscosity oil retarder to the target pumping oil quantity corresponding to the first initial opening degree.

[0113] The second control module 430 is used to determine the second initial opening of the second flow control valve according to the first retarding gear, and control the second flow control valve to open to the second initial opening so as to adjust the oil output of the working chamber in the high viscosity oil retarder body to the target oil output corresponding to the second initial opening.

[0114] The third control module 440 is used to control the first solenoid valve, the second solenoid valve and the third solenoid valve to turn on and off according to the control strategy corresponding to the first retarding gear. During the process of drawing high viscosity oil into or drawing high viscosity oil out of the working chamber of the high viscosity oil retarder body according to the target pumping oil volume and discharging high viscosity oil from the working chamber according to the target output oil volume, the pressure in the working chamber of the high viscosity oil retarder body is changed so as to slow down the vehicle speed to the driving speed corresponding to the first retarding gear.

[0115] Furthermore, when the first gear engagement operation is the first gear engagement operation of the high-viscosity oil retarder in an unloaded state, the third control module 440, according to the control strategy corresponding to the first retarding gear, controls the on / off state of the first solenoid valve, the second solenoid valve, and the third solenoid valve to change the pressure in the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume and to discharge the high-viscosity oil from the working chamber according to the target output oil volume, so as to slow the vehicle speed to the driving speed corresponding to the first retarding gear, the third control module 440 is used to:

[0116] According to the control strategy corresponding to the first slow gear, the first solenoid valve and the third solenoid valve are de-energized, and the second solenoid valve is energized.

[0117] Monitor the energization duration of the second solenoid valve and the pressure in the working chamber of the high-viscosity oil retarder body;

[0118] When the monitored energization time of the second solenoid valve exceeds the preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first lower pressure limit, or when the monitored energization time of the second solenoid valve does not exceed the preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first upper pressure limit, the third solenoid valve is controlled to be energized. During the process of drawing high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume and discharging high-viscosity oil from the working chamber according to the target output oil volume, the pressure in the working chamber of the high-viscosity oil retarder body is changed to slow the vehicle speed to the driving speed corresponding to the first retarding gear.

[0119] Furthermore, the control device 400 also includes: a gear adjustment module 450; the gear adjustment module 450 is used for:

[0120] In response to the received second gear engagement operation, the second retarding gear of the high viscosity oil retarder is determined;

[0121] Control the first flow control valve to open to the first target opening degree indicated by the second slow speed position;

[0122] Based on the gear ratios of the first and second retarder gears, the second target opening of the second flow control valve is determined. By controlling the on / off state of the first and third solenoid valves, high-viscosity oil is drawn into or extracted from the working chamber of the high-viscosity oil retarder body according to the target pumping volume corresponding to the first target opening, and high-viscosity oil is discharged from the working chamber according to the target output volume corresponding to the second target opening. This changes the pressure in the working chamber of the high-viscosity oil retarder body, thereby slowing the vehicle's current speed to the speed corresponding to the second retarder gear.

[0123] Furthermore, the gear adjustment module 450 is used to determine the second target opening of the second flow control valve based on the gear ratio relationship between the first and second retarder gears; and to control the on / off state of the first and third solenoid valves to draw high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening and to discharge high-viscosity oil from the working chamber according to the target output oil volume corresponding to the second target opening, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body and slowing the vehicle's current speed to the speed corresponding to the second retarder gear, the gear adjustment module 450 is used to:

[0124] When the retarding level of the second retarding gear increases compared to the first retarding gear, the second target opening of the second flow control valve is determined to be zero; the first solenoid valve is de-energized and the third solenoid valve is energized, so that high viscosity oil is drawn into the working chamber of the high viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening and high viscosity oil is discharged from the working chamber according to the target output oil volume corresponding to the second target opening, thereby changing the pressure in the working chamber of the high viscosity oil retarder body and slowing the current driving speed of the vehicle to the driving speed corresponding to the second retarding gear;

[0125] When the retarding level of the second retarding gear is lower than that of the first retarding gear, the second target opening of the second flow control valve is determined to be a predetermined opening; the first solenoid valve is energized and the third solenoid valve is de-energized, so that high-viscosity oil is extracted from the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening and high-viscosity oil is discharged from the working chamber according to the target output oil volume corresponding to the second target opening, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body and slowing the current driving speed of the vehicle to the driving speed corresponding to the second retarding gear.

[0126] Furthermore, the control device 400 also includes: an unloaded adjustment module 460; the unloaded adjustment module 460 is used for:

[0127] In response to the received neutral operation, the first solenoid valve, the second solenoid valve and the third solenoid valve are de-energized, and the first flow control valve and the second flow control valve are opened, so that the high viscosity oil retarder is in the no-load state.

[0128] Furthermore, both the first flow control valve and the second flow control valve are electromagnetic proportional valves.

[0129] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described actions. Figure 1 as well as Figure 3 The steps of the control method in the illustrated method embodiment can be found in the method embodiment for specific implementation, and will not be repeated here.

[0130] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0131] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. The apparatus embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some communication interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0132] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0133] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0134] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0135] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method for a high-viscosity oil retarder, characterized in that, The high-viscosity oil retarder includes: a first solenoid valve, a second solenoid valve, a third solenoid valve, a first flow control valve, a second flow control valve, and a high-viscosity oil retarder body; the control method includes: In response to the received first gear engagement operation, the first retarding gear of the high viscosity oil retarder is determined; The first initial opening of the first flow control valve is determined based on the first retarding gear, and the first flow control valve is controlled to open to the first initial opening so as to adjust the pumping oil volume of the variable pump in the high viscosity oil retarder to the target pumping oil volume corresponding to the first initial opening. The second initial opening of the second flow control valve is determined based on the first retarding gear, and the second flow control valve is controlled to open to the second initial opening so as to adjust the oil output of the working chamber in the high viscosity oil retarder body to the target oil output corresponding to the second initial opening. According to the control strategy corresponding to the first retarder position, by controlling the on and off of the first solenoid valve, the second solenoid valve and the third solenoid valve, the pressure in the working chamber of the high viscosity oil retarder body is changed during the process of drawing high viscosity oil into or out of the working chamber according to the target pumping oil volume and discharging high viscosity oil from the working chamber according to the target output oil volume, so as to slow down the vehicle speed to the driving speed corresponding to the first retarder position. The control method further includes: In response to the received second gear engagement operation, the second retarding gear of the high viscosity oil retarder is determined; Control the first flow control valve to open to the first target opening degree indicated by the second slow speed position; Based on the gear ratios of the first and second retarder gears, the second target opening of the second flow control valve is determined. By controlling the on / off state of the first and third solenoid valves, high-viscosity oil is drawn into or extracted from the working chamber of the high-viscosity oil retarder body according to the target pumping volume corresponding to the first target opening, and high-viscosity oil is discharged from the working chamber according to the target output volume corresponding to the second target opening. This changes the pressure in the working chamber of the high-viscosity oil retarder body, thereby slowing the vehicle's current speed to the speed corresponding to the second retarder gear.

2. The control method according to claim 1, characterized in that, When the first gear engagement is the first gear engagement of the high-viscosity oil retarder in an unloaded state, the step of controlling the first, second, and third solenoid valves to draw high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping volume and discharging high-viscosity oil from the working chamber according to the target output volume, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body to slow the vehicle speed to the driving speed corresponding to the first retarder gear, according to the control strategy corresponding to the first retarder gear, includes: According to the control strategy corresponding to the first slow gear, the first solenoid valve and the third solenoid valve are de-energized, and the second solenoid valve is energized. Monitor the energization duration of the second solenoid valve and the pressure in the working chamber of the high-viscosity oil retarder body; When the monitored energization time of the second solenoid valve exceeds a preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first lower pressure limit, or when the monitored energization time of the second solenoid valve does not exceed the preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first upper pressure limit, the third solenoid valve is controlled to be energized. During the process of drawing high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume and discharging high-viscosity oil from the working chamber according to the target output oil volume, the pressure in the working chamber of the high-viscosity oil retarder body is changed to slow the vehicle speed to the driving speed corresponding to the first retarding gear.

3. The control method according to claim 1, characterized in that, The step of determining the second target opening degree of the second flow control valve based on the gear ratio of the first and second retarding gears; and controlling the on / off state of the first and third solenoid valves to draw high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping volume corresponding to the first target opening degree and to discharge high-viscosity oil from the working chamber according to the target output volume corresponding to the second target opening degree, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body and slowing the vehicle's current driving speed to the driving speed corresponding to the second retarding gear, includes: When the retarding level of the second retarding gear increases compared to the first retarding gear, the second target opening of the second flow control valve is determined to be zero; the first solenoid valve is de-energized and the third solenoid valve is energized, so that high viscosity oil is drawn into the working chamber of the high viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening and high viscosity oil is discharged from the working chamber according to the target output oil volume corresponding to the second target opening, thereby changing the pressure in the working chamber of the high viscosity oil retarder body and slowing the current driving speed of the vehicle to the driving speed corresponding to the second retarding gear; When the retarding level of the second retarding gear is lower than that of the first retarding gear, the second target opening of the second flow control valve is determined to be a predetermined opening; the first solenoid valve is energized and the third solenoid valve is de-energized, so that high-viscosity oil is extracted from the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume corresponding to the first target opening and high-viscosity oil is discharged from the working chamber according to the target output oil volume corresponding to the second target opening, thereby changing the pressure in the working chamber of the high-viscosity oil retarder body and slowing the current driving speed of the vehicle to the driving speed corresponding to the second retarding gear.

4. The control method according to claim 2, characterized in that, The control method further includes: In response to the received neutral operation, the first solenoid valve, the second solenoid valve and the third solenoid valve are de-energized, and the first flow control valve and the second flow control valve are opened, so that the high viscosity oil retarder is in the no-load state.

5. The control method according to claim 1, characterized in that, The first flow control valve and the second flow control valve are electromagnetic proportional valves.

6. A control device for a high-viscosity oil retarder, characterized in that, The high-viscosity oil retarder includes: a first solenoid valve, a second solenoid valve, a third solenoid valve, a first flow control valve, a second flow control valve, and a high-viscosity oil retarder body; the control device includes: The first determining module is used to determine the first retarding gear of the high viscosity oil retarder in response to the received first gear engagement operation; The first control module is used to determine the first initial opening of the first flow control valve according to the first retarding gear, and control the first flow control valve to open to the first initial opening so as to adjust the pumping oil volume of the variable pump in the high viscosity oil retarder to the target pumping oil volume corresponding to the first initial opening. The second control module is used to determine the second initial opening of the second flow control valve according to the first retarding gear, and control the second flow control valve to open to the second initial opening so as to adjust the oil output of the working chamber in the high viscosity oil retarder body to the target oil output corresponding to the second initial opening. The third control module is used to control the first solenoid valve, the second solenoid valve and the third solenoid valve to turn on and off according to the control strategy corresponding to the first retarding gear. During the process of drawing high viscosity oil into or drawing high viscosity oil out of the working chamber of the high viscosity oil retarder body according to the target pumping oil volume and discharging high viscosity oil out of the working chamber according to the target oil output volume, the pressure in the working chamber of the high viscosity oil retarder body is changed so as to slow down the vehicle speed to the driving speed corresponding to the first retarding gear. The control device further includes: a gear adjustment module; the gear adjustment module is used for: In response to the received second gear engagement operation, the second retarding gear of the high viscosity oil retarder is determined; Control the first flow control valve to open to the first target opening degree indicated by the second slow speed position; Based on the gear ratios of the first and second retarder gears, the second target opening of the second flow control valve is determined. By controlling the on / off state of the first and third solenoid valves, high-viscosity oil is drawn into or extracted from the working chamber of the high-viscosity oil retarder body according to the target pumping volume corresponding to the first target opening, and high-viscosity oil is discharged from the working chamber according to the target output volume corresponding to the second target opening. This changes the pressure in the working chamber of the high-viscosity oil retarder body, thereby slowing the vehicle's current speed to the speed corresponding to the second retarder gear.

7. The control device according to claim 6, characterized in that, When the first gear engagement is the first gear engagement of the high-viscosity oil retarder in an unloaded state, the third control module, according to the control strategy corresponding to the first retarding gear, controls the on / off state of the first, second, and third solenoid valves to change the pressure in the working chamber of the high-viscosity oil retarder body during the process of drawing high-viscosity oil into or out of the working chamber according to the target pumping volume and discharging high-viscosity oil from the working chamber according to the target output volume, so as to slow the vehicle speed to the driving speed corresponding to the first retarding gear, the third control module is used to: According to the control strategy corresponding to the first slow gear, the first solenoid valve and the third solenoid valve are de-energized, and the second solenoid valve is energized. Monitor the energization duration of the second solenoid valve and the pressure in the working chamber of the high-viscosity oil retarder body; When the monitored energization time of the second solenoid valve exceeds the preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first lower pressure limit, or when the monitored energization time of the second solenoid valve does not exceed the preset time and the pressure in the working chamber of the high-viscosity oil retarder body is greater than the first upper pressure limit, the third solenoid valve is controlled to be energized. During the process of drawing high-viscosity oil into or out of the working chamber of the high-viscosity oil retarder body according to the target pumping oil volume and discharging high-viscosity oil from the working chamber according to the target output oil volume, the pressure in the working chamber of the high-viscosity oil retarder body is changed to slow the vehicle speed to the driving speed corresponding to the first retarding gear.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, performs the steps of the control method as described in any one of claims 1 to 5.

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