Cooling system and control method for a hybrid sanitation vehicle

Abstract

The application discloses a cooling system and a control method of a hybrid sanitation vehicle, and relates to the field of sanitation vehicles. The cooling system comprises a high-temperature cooling branch and a low-temperature cooling branch, the high-temperature cooling branch is provided with an engine, the low-temperature cooling branch is connected in parallel with the high-temperature cooling branch and comprises a first cooling branch, a second cooling branch and a third cooling branch connected in parallel, the first cooling branch is provided with a first controller and a driving motor, the second cooling branch is provided with an oil pump motor and a fan motor, and the third cooling branch is provided with a water pump motor; a heat dissipation device is connected with the high-temperature cooling branch, the first cooling branch, the second cooling branch and the third cooling branch through a control valve; and a control device is in communication with the control valve and is used for controlling the on-off state of the control valve, so that the heat dissipation device and the multiple cooling branches are selectively connected to form a cooling loop. According to the cooling system provided in the embodiment of the application, the heat dissipation device is connected with the multiple cooling branches, the integration degree of the cooling system is high, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of cooling technology, and in particular to a cooling system and control method for a hybrid sanitation vehicle. Background Technology

[0002] In related technologies, the engine, drive motor, chassis controller, and superstructure motor and controller of hybrid sanitation vehicles all require cooling systems for heat dissipation. That is, the engine, chassis drive motor, and superstructure each have an independent cooling system. The three cooling systems are complex to arrange on the whole vehicle, with a large number of parts, high vehicle weight and cost, and there is room for improvement. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a cooling system for hybrid sanitation vehicles, wherein the cooling system has high integration and high heat dissipation efficiency.

[0004] This invention also proposes a control method for the cooling system of a hybrid sanitation vehicle.

[0005] A cooling system for a hybrid sanitation vehicle according to a first aspect of the present invention includes: a high-temperature cooling branch having an engine; a low-temperature cooling branch connected in parallel with the high-temperature cooling branch and including a first cooling branch, a second cooling branch, and a third cooling branch, wherein the first cooling branch has a first controller and a drive motor, the second cooling branch has an oil pump motor and a fan motor, and the third cooling branch has a water pump motor, and the first, second, and third cooling branches are connected in parallel; a heat dissipation device cooperating with the high-temperature cooling branch, the first cooling branch, the second cooling branch, and the third cooling branch via a control valve; and a control device communicating with the control valve for controlling the on / off state of the control valve, thereby selectively connecting the heat dissipation device with multiple cooling branches to form a cooling circuit.

[0006] The cooling system of the hybrid sanitation vehicle according to an embodiment of the present invention integrates multiple cooling branches through the cooperation of a heat dissipation device and multiple cooling branches, eliminating the need for multiple cooling systems, saving vehicle layout space, and reducing vehicle weight and manufacturing costs. By controlling the on / off state of the control valve according to the actual conditions of the vehicle, the heat dissipation device and multiple cooling branches can be selectively connected through the control valve, achieving precise control of heat dissipation for each component requiring heat dissipation, improving heat dissipation efficiency, and effectively reducing system power consumption and vehicle energy consumption.

[0007] According to some embodiments of the present invention, the heat dissipation device includes: a first heat dissipation branch and a second heat dissipation branch, the first heat dissipation branch including a condenser, an intercooler, a main radiator and a main cooling fan, the second heat dissipation branch including an auxiliary radiator and an auxiliary cooling fan, the control valve including a first four-way valve and a second four-way valve, the outlet of the first heat dissipation branch and the outlet of the second heat dissipation branch being connected through the first four-way valve, and the first four-way valve being connected to a plurality of cooling branches, the inlet of the first heat dissipation branch and the inlet of the second heat dissipation branch being connected through the second four-way valve, and the second four-way valve being connected to a plurality of cooling branches.

[0008] In some examples, the cooling system of the hybrid sanitation vehicle also includes an auxiliary water tank, which is connected to both the main radiator and the auxiliary radiator to form a filling and degassing circuit.

[0009] In some examples, the inlet of the first cooling branch, the inlet of the second cooling branch, and the inlet of the third cooling branch are connected by a third four-way valve, which is located upstream of the second four-way valve.

[0010] According to some embodiments of the present invention, the high-temperature cooling branch further includes a thermostat and an engine water pump, wherein the thermostat is connected to the inlet of the engine water pump to form an internal circulation cooling circuit when the thermostat is closed; each cooling branch has a temperature sensor, which communicates with the control device.

[0011] According to a second aspect of the present invention, a control method for a cooling system of a hybrid sanitation vehicle includes a first operating mode and a second operating mode. In the first operating mode, the hybrid sanitation vehicle is controlled to be in a driving state, and in the second operating mode, the hybrid sanitation vehicle is controlled to be in a sweeping state. The control method includes: determining the operating mode of the vehicle; determining that the hybrid sanitation vehicle is in the first operating mode, and controlling the heat dissipation device to connect with at least one of a high-temperature cooling branch and a first cooling branch; determining that the hybrid sanitation vehicle is in the second operating mode, and controlling the heat dissipation device to connect with at least one of the high-temperature cooling branch and the low-temperature cooling branch.

[0012] According to the control method of the cooling system of the hybrid sanitation vehicle of the present invention, by adopting the above-mentioned cooling system and selecting different working modes, the heat dissipation device and multiple cooling branches can be selectively connected through control valves, thereby realizing precise control of heat dissipation of each component that needs heat dissipation, improving heat dissipation efficiency, and effectively reducing system power consumption and vehicle energy consumption.

[0013] According to some embodiments of the present invention, determining that the hybrid sanitation vehicle is in a first working mode and controlling the heat dissipation device to connect with at least one of the high-temperature cooling branch and the first cooling branch includes: acquiring the opening signal of the accelerator pedal and controlling the heat dissipation device to connect with the first cooling branch according to the opening of the accelerator pedal; acquiring the engine water outlet temperature and controlling the heat dissipation device to connect with the high-temperature cooling branch according to the engine water outlet temperature.

[0014] In some examples, the heat dissipation device includes a first heat dissipation branch and a second heat dissipation branch. The step of controlling the connection between the heat dissipation device and the first cooling branch of the low-temperature cooling branch according to the opening degree of the accelerator pedal includes: when the opening degree of the accelerator pedal is greater than a preset opening degree, controlling the first heat dissipation branch and the second heat dissipation branch to be connected to the first cooling branch respectively; after the engine starts, controlling the first heat dissipation branch to be disconnected from the first cooling branch; determining the working state of the drive motor, and controlling the speed of the auxiliary cooling fan of the second heat dissipation branch according to the working state of the drive motor.

[0015] In some examples, the heat dissipation device includes a first heat dissipation branch and a second heat dissipation branch. The step of controlling the connection between the heat dissipation device and the high-temperature cooling branch according to the engine's outlet water temperature includes: when the engine temperature is greater than or equal to a first preset temperature and less than a second preset temperature, controlling the first heat dissipation branch to connect with the high-temperature cooling branch; and when the engine temperature is greater than or equal to the second preset temperature, controlling the first heat dissipation branch and the second heat dissipation branch to connect with the high-temperature cooling branch respectively.

[0016] In some examples, when the engine temperature is greater than or equal to a first preset temperature and less than a second preset temperature, the speed of the main cooling fan of the first cooling branch is controlled according to the engine temperature.

[0017] According to some embodiments of the present invention, the heat dissipation device includes a first heat dissipation branch and a second heat dissipation branch. In a second operating mode, controlling the heat dissipation device to connect with at least one of the high-temperature cooling branch and the low-temperature cooling branch includes: acquiring the opening signal of the accelerator pedal; when the opening of the accelerator pedal is 0, controlling the first heat dissipation branch to connect with the low-temperature cooling branch; when the opening of the accelerator pedal is greater than 0, controlling the first heat dissipation branch to connect with the high-temperature cooling branch, and controlling the second heat dissipation branch to connect with the low-temperature cooling branch.

[0018] In some examples, the method further includes: acquiring vehicle gear position signal, vehicle speed signal, and cleaning operation intensity, and controlling the gear of the main cooling fan of the first cooling branch based on the vehicle gear position signal, the vehicle speed signal, and the cleaning operation intensity.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the cooling system of a hybrid sanitation vehicle according to some embodiments of the present invention;

[0022] Figure 2 This is a flowchart of a control method for the cooling system of a hybrid sanitation vehicle according to some embodiments of the present invention.

[0023] Figure label:

[0024] The cooling system 100 of the hybrid sanitation vehicle includes a first cooling branch 11, a main cooling fan 111, a second cooling branch 12, an auxiliary cooling fan 121, a high-temperature cooling branch 21, a first cooling branch 22, a second cooling branch 23, a third cooling branch 24, a first four-way valve 31, a second four-way valve 32, and a third four-way valve 33. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, it should be understood that the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the technical terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or a single connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can readily understand the meaning of the above technical terms in this invention.

[0028] The following is for reference. Figures 1-2 The cooling system 100 of a hybrid sanitation vehicle according to an embodiment of the present invention is described.

[0029] like Figure 1 As shown, the cooling system 100 of the hybrid sanitation vehicle according to an embodiment of the present invention includes: a high-temperature cooling branch 21, a low-temperature cooling branch, a heat dissipation device, and a control device; the high-temperature cooling branch 21 has an engine, and the low-temperature cooling branch is connected in parallel with the high-temperature cooling branch 21. The low-temperature cooling branch includes: a first cooling branch 22, a second cooling branch 23, and a third cooling branch 24. The first cooling branch 22 has a first controller and a drive motor, the second cooling branch 23 has an oil pump motor and a fan motor, and the third cooling branch 24 has a water pump motor. The cooling branches 24 are connected in parallel. By connecting multiple cooling branches in parallel, the cooling system 100 can selectively cool multiple cooling branches, which is beneficial for the cooling system 100 to switch the working state according to the actual situation to control energy consumption. The heat dissipation device cooperates with the high-temperature cooling branch 21, the first cooling branch 22, the second cooling branch 23 and the third cooling branch 24 through the control valve. The control device communicates with the control valve to control the on and off state of the control valve, so that the heat dissipation device can selectively connect with multiple cooling branches to form a cooling circuit, which can realize the heat dissipation device to dissipate heat from the components that need heat dissipation in multiple cooling branches.

[0030] The cooling system 100 of the hybrid sanitation vehicle according to an embodiment of the present invention integrates multiple cooling branches through the cooperation of a heat dissipation device and multiple cooling branches, eliminating the need for multiple cooling systems 100, saving overall vehicle layout space, reducing overall vehicle weight and manufacturing costs; by controlling the on / off state of the control valve according to the actual conditions of the vehicle through the control device, the heat dissipation device and multiple cooling branches can be selectively connected through the control valve, realizing precise control of heat dissipation of each component requiring heat dissipation, improving heat dissipation efficiency, and effectively reducing system power consumption and overall vehicle energy consumption.

[0031] In the above embodiments, the engine cooling system and the motor cooling system have a large temperature difference. By setting up high-temperature cooling branches and low-temperature cooling branches, the cooling of the engine and the motor can be separated, and the high-temperature cooling and low-temperature cooling can be integrated into one cooling system. This allows the cooling system to control the main radiator to selectively cool the engine or the motor according to the working mode of the hybrid sanitation vehicle, saving the energy consumption of the whole vehicle and reducing the impact between engine cooling and motor cooling.

[0032] According to some embodiments of the present invention, the heat dissipation device includes: a first heat dissipation branch 11 and a second heat dissipation branch 12. The first heat dissipation branch 11 includes a condenser, an intercooler, a main radiator and a main cooling fan 111. The second heat dissipation branch 12 includes an auxiliary radiator and an auxiliary cooling fan 121. The control valve includes a first four-way valve 31 and a second four-way valve 32. The outlet of the first heat dissipation branch 11 and the outlet of the second heat dissipation branch 12 are connected through the first four-way valve 31. The inlet of the first heat dissipation branch 11 and the inlet of the second heat dissipation branch 12 are connected through the second four-way valve 32.

[0033] The first four-way valve 31 is directly connected to the high-temperature cooling branch 21, and can also be connected to the low-temperature cooling branch via an electronic water pump. The second four-way valve 32 is directly connected to multiple cooling branches. Thus, the first four-way valve 31 and the second four-way valve 32 work together to achieve parallel connection of the first heat dissipation branch 11 and the second heat dissipation branch 12, as well as parallel connection of the high-temperature cooling branch 21 and the low-temperature cooling branch. Since the cooling branches and heat dissipation branches are connected to form a cooling loop, the cooling system 100 can switch the cooling loop to achieve precise heat dissipation of the components that need heat dissipation, thereby improving heat dissipation efficiency and facilitating the integration of the cooling system 100.

[0034] In some examples, the main radiator can be connected to the cooling branch through a heat dissipation branch and absorb the heat of the components that need to be dissipated in the cooling branch through the circulation of cooling water. When the main cooling fan 111 is working, it can dissipate heat from the condenser, intercooler and main radiator. The auxiliary radiator can also be connected to the cooling branch through a heat dissipation branch and absorb the heat of the components that need to be dissipated in the cooling branch through the circulation of cooling water. When the auxiliary cooling fan 121 is working, it can dissipate heat from the auxiliary radiator, thereby realizing the heat dissipation function of the cooling system 100.

[0035] In some examples, the cooling system 100 of the hybrid sanitation vehicle also includes an auxiliary water tank, which is connected to both the main radiator and the auxiliary radiator to form a filling and degassing circuit. Through the integration of the cooling system 100, a single auxiliary water tank can connect all cooling circuits, improving the filling efficiency of the production line and the convenience of after-sales maintenance. It should be noted that the auxiliary water tank can be connected upstream of the first four-way valve 31 to add water to the pipes in the cooling system 100, supplementing the cooling system 100 with cooling water. It also allows the pipes in the cooling system 100 to spontaneously expel air during the water filling process, resulting in good venting and improved reliability. The auxiliary water tank can be connected to both the main radiator and the auxiliary radiator, facilitating connection and guiding the air in the cooling system 100 through the auxiliary water tank for discharge, ensuring the cooling effect of the cooling system 100 on all components requiring heat dissipation and improving the stability of the cooling system 100.

[0036] Of course, the outlets of the first cooling branch 22, the second cooling branch 23 and the third cooling branch 24 (the outlets of the low-temperature cooling branch) are connected, and the outlets are connected to the second four-way valve 32. The auxiliary water tank can be connected to the pipeline between the outlet and the second four-way valve 32, which can also play a role in degassing the cooling system 100. While saving pipelines, it can improve the cooling effect of the cooling system 100 on various components that need heat dissipation, and further improve the stability and reliability of the cooling system 100.

[0037] In some examples, the control valve also includes a third four-way valve 33, through which the inlets of the first cooling branch 22, the second cooling branch 23, and the third cooling branch 24 (the inlet of the low-temperature cooling branch) are connected. This allows the first cooling branch 22, the second cooling branch 23, and the third cooling branch 24 to be selectively connected to the heat dissipation device. The third four-way valve 33 is located upstream of the second four-way valve 32, enabling the parallel connection of the first cooling branch 22, the second cooling branch 23, and the third cooling branch 24. This facilitates the switching of cooling circuits in the cooling system 100, further improving the accuracy of heat dissipation for each component requiring heat dissipation, resulting in high heat dissipation efficiency and effectively reducing system power consumption and vehicle energy consumption. It should be noted that the electronic water pump is located between the first four-way valve 31 and the third four-way valve 33, providing power for the flow of cooling water in the first cooling branch 22, the second cooling branch 23, and the third cooling branch 24 (the low-temperature cooling branch).

[0038] In some examples, the cooling limit of the engine is higher than the cooling limit of the components requiring heat dissipation in the low-temperature cooling branch. Therefore, by setting the first four-way valve and the third four-way valve, it can be ensured that the cooling water in the high-temperature cooling branch 21 does not flow to the low-temperature cooling branch, making the distribution of cooling water flow in each cooling branch of the cooling system 100 more precise and improving the heat dissipation efficiency of the cooling system 100. In some examples, the auxiliary radiator can be arranged on both sides of the longitudinal beam of the frame according to the overall vehicle situation, which is convenient for heat dissipation by air convection under natural conditions, saving vehicle energy and facilitating the arrangement. Of course, the auxiliary radiator can also be physically integrated with the intercooler in the front module of the vehicle, that is, the auxiliary radiator and the intercooler are arranged together, which improves the utilization rate of the vehicle space.

[0039] According to some embodiments of the present invention, the high-temperature cooling branch 21 further includes a thermostat and an engine water pump. The thermostat is connected to the inlet of the engine water pump. When the thermostat is closed, an internal circulation cooling circuit can be formed. The engine water pump can provide power for the flow of cooling water in the high-temperature cooling branch 21. That is, the engine water pump can drive the cooling water to flow through the engine and the thermostat in sequence, and then flow back to the engine water pump, which can realize the heat dissipation of the engine under low power conditions to reduce system power consumption. When the thermostat is open, the cooling water can directly enter the first heat dissipation branch 11 through the second four-way valve 32 after flowing through the thermostat. The first heat dissipation branch 11 cooperates with the high-temperature cooling branch 21 to form an external circulation cooling circuit, which can realize the heat dissipation of the engine under high power conditions and improve the heat dissipation effect.

[0040] In some examples, the first controller controls the operation of the drive motor, and the third cooling branch 24 also includes a second controller that controls the operation of the water pump motor.

[0041] In some examples, each cooling branch has its own temperature sensor that communicates with the control unit and can provide feedback to the control unit on the temperature of the cooling water at the location of the temperature sensor.

[0042] In some examples, the cooling fan can be a PWM fan, which is highly sensitive and can obtain temperature information from the control device, making the fan speed adjustment instantaneous, with good heat dissipation effect and strong adaptability.

[0043] In some examples, the drive motor can start the vehicle quickly, and the drive motor heats up rapidly when it is working. Therefore, the first cooling branch 22 needs to perform heat dissipation work on the drive motor in advance to avoid torque limitation faults in the drive motor.

[0044] In some examples, the water pump motor can deliver clean water from the vehicle's water tank through pipes to high-pressure water guns or spray devices for sanitation operations such as cleaning roads and garbage cans. The operation of the water pump motor can generate sufficient water pressure and flow, making the cleaning operation more efficient and convenient. At the same time, the water pump motor can also be used to supplement the water source of the vehicle's fire-fighting equipment, improving the overall efficiency of the sanitation vehicle.

[0045] In some examples, the fan motor can power the vacuuming device on the sanitation vehicle to absorb garbage, sewage, etc. on roads and in public places; the fan motor can generate strong suction, specifically, by electrically driving the fan to rotate, to generate wind pressure to suck in air and garbage, which can enable the vacuuming device to work properly and improve the cleaning efficiency of the sanitation vehicle.

[0046] In some examples, the oil pump motor can power the hydraulic system of the sanitation vehicle, which is used to control various devices, such as lifting and tilting the garbage bins, and spraying water for cleaning. Specifically, by driving the oil pump electrically, the hydraulic oil pressure can be increased, so that the oil in the hydraulic cylinder and pipeline can drive the mechanical devices to operate normally, ensuring that various operations are carried out normally, and improving the efficiency and quality of the sanitation vehicle's work.

[0047] In some examples, the first controller refers to an electronic control module that controls the chassis system of a sanitation vehicle. It can be used to control the vehicle's speed, steering, braking and other chassis-related systems. The first controller controls the vehicle's movement by monitoring signals such as vehicle speed, throttle, brakes and steering wheel, as well as various data collected by sensors, thereby improving the safety and stability of the vehicle's movement.

[0048] In some examples, the second controller can control various equipment used by the sanitation vehicle for cleaning the road surface, such as a garbage bin tipping mechanism, a garbage compactor, a water spraying system, a vacuum cleaner, a water spraying system, etc.

[0049] According to the control method of the cooling system 100 of the hybrid sanitation vehicle of the present invention, the vehicle has a first working mode and a second working mode. In the first working mode, the hybrid sanitation vehicle is controlled to be in a driving state, and in the second working mode, the hybrid sanitation vehicle is controlled to be in a sweeping state.

[0050] Control methods include: determining the vehicle's operating mode;

[0051] When the hybrid sanitation vehicle is determined to be in the first working mode, the heat dissipation device is connected to at least one of the high-temperature cooling branch 21 and the first cooling branch 22.

[0052] The system determines that the hybrid sanitation vehicle is in the second working mode and controls the cooling device to connect to at least one of the high-temperature cooling branch 21 and the low-temperature cooling branch.

[0053] According to the control method of the cooling system 100 of the hybrid sanitation vehicle of the present invention, by adopting the above-mentioned cooling system 100 and selecting different working modes, the heat dissipation device and multiple cooling branches can be selectively connected through control valves, thereby realizing precise control of heat dissipation of each component that needs heat dissipation, improving heat dissipation efficiency, and effectively reducing system power consumption and vehicle energy consumption.

[0054] In some examples, the first working mode can be a garbage transfer mode, in which the vehicle can drive normally and transport garbage, and the second working mode can be a garbage sweeping mode, in which the vehicle can clean the road surface in place or clean the road surface while moving to increase the cleaning range.

[0055] According to some embodiments of the present invention, determining that the hybrid sanitation vehicle is in a first operating mode and controlling the heat dissipation device to connect with at least one of the high-temperature cooling branch 21 and the first cooling branch 22 includes:

[0056] The opening signal of the accelerator pedal is collected, and the connection between the heat dissipation device and the first cooling branch 22 is controlled according to the opening of the accelerator pedal.

[0057] Collect the engine outlet water temperature, and control the connection between the heat dissipation device and the high-temperature cooling branch 21 based on the engine outlet water temperature.

[0058] In some embodiments, when the vehicle is in the first operating mode, the cooling system 100 controls the connection between the heat dissipation device and the first cooling branch 22 according to the opening degree of the accelerator pedal, which can improve the cooling effect of the first cooling branch 22 and make the cooling control of the first cooling branch 22 more precise; by controlling the connection between the heat dissipation device and the high-temperature cooling branch 21 according to the engine outlet water temperature, the cooling effect of the high-temperature cooling branch 21 can be improved and the cooling control of the high-temperature cooling branch 21 can be more precise; in addition, the first cooling branch 22 contains a drive motor, and the control of the heat dissipation device to cool the drive motor needs to fully consider the accelerator pedal signal, which is conducive to achieving pre-cooling of the drive motor and reducing the probability of torque limiting failure of the drive motor.

[0059] In some examples, the heat dissipation device includes a first heat dissipation branch 11 and a second heat dissipation branch 12, and the first cooling branch 22, which controls the heat dissipation device to be connected to the low-temperature cooling branch according to the opening degree of the accelerator pedal, includes:

[0060] When the accelerator pedal opening is greater than the preset opening, the first heat dissipation branch 11 and the second heat dissipation branch 12 are respectively connected to the first cooling branch 22.

[0061] After the engine starts, the first heat dissipation branch 11 is disconnected from the first cooling branch 22;

[0062] Determine the operating status of the drive motor and control the speed of the auxiliary cooling fan 121 of the second heat dissipation branch 12 according to the operating status of the drive motor.

[0063] Please see Figure 2 In some embodiments, the first heat dissipation branch 11 has a main heat sink and a main cooling fan 111, and the second heat dissipation branch 12 has a secondary heat sink and a secondary cooling fan 121. The secondary cooling fan 121 has four speeds: a, b, c, and d. By gradually switching from speed a to speed d, the fan speed gradually increases, the fan speed gradually increases, and the cooling effect on the secondary heat sink gradually increases.

[0064] When the accelerator pedal opening is greater than 50% of the preset opening, the drive motor is in a state of rapid vehicle start-up, and its heat generation is relatively large. The first heat dissipation branch 11 and the second heat dissipation branch 12 are respectively connected to the first cooling branch 22, so that both the main radiator and the auxiliary radiator cool the drive motor, resulting in good cooling effect. Furthermore, after the engine starts, the cooling system 100 controls the first heat dissipation branch 11 to disconnect from the first cooling branch 22, so that the auxiliary radiator cools the drive motor separately, thereby making the power distribution of the cooling system 100 more reasonable and balanced.

[0065] The first cooling branch 22 also has a first controller. When the drive motor is in a stopped state, the auxiliary heat sink cools the first controller separately, and the auxiliary cooling fan 121 is set to speed a. When the drive motor is in a working state, the auxiliary heat sink cools both the drive motor and the first controller. The drive motor has a power generation state and a driving state. When the drive motor is in a power generation state, the auxiliary cooling fan 121 can be controlled to speed b. When the drive motor is in a driving state, the auxiliary cooling fan 121 can be controlled to speed c. This improves the cooling effect on the drive motor while reasonably controlling the energy consumption of the cooling system 100.

[0066] In some examples, the cooling device includes a first cooling branch 11 and a second cooling branch 12, and the connection between the cooling device and the high-temperature cooling branch 21 is controlled according to the engine's outlet water temperature, including:

[0067] When the engine temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the first heat dissipation branch 11 is connected to the high temperature cooling branch 21.

[0068] When the engine temperature is greater than or equal to the second preset temperature, the first heat dissipation branch 11 and the second heat dissipation branch 12 are respectively connected to the high temperature cooling branch 21.

[0069] When the engine temperature is lower than the first preset temperature, the heat dissipation device is disconnected from the high-temperature cooling branch 21.

[0070] Please see Figure 2 In some embodiments, the high-temperature cooling branch 21 has an engine. Within the high-temperature cooling branch 21, there is a temperature sensor and a thermostat at the outlet of the engine, and an engine water pump at the inlet of the engine. The cooling system 100 can collect the outlet water temperature t1 of the engine through the temperature sensor. Here, the first preset temperature can be 93°C, and the second preset temperature can be 106°C. When 93°C ≤ t1 < 106°C, the thermostat opens, and the cooling system 100 can control the first heat dissipation branch 11 to connect with the high-temperature cooling branch 21, so that the main radiator provides separate cooling for the engine. When t1≥106℃, the cooling system 100 can control the first heat dissipation branch 11 and the second heat dissipation branch 12 to be connected to the high-temperature cooling branch 21 respectively, so that both the main radiator and the auxiliary radiator cool the engine, resulting in good cooling effect. In addition, when t1<93℃, the thermostat is disconnected, that is, the heat dissipation device is disconnected from the high-temperature cooling branch 21, and the engine water pump can drive the cooling water to flow through the engine and the thermostat in sequence, and then flow back to the engine water pump, forming an internal circulation cooling circuit, which ensures the cooling effect of the engine and controls energy consumption. The main cooling fan 111 is set to gear A.

[0071] In some examples, when the engine temperature is greater than or equal to a first preset temperature and less than a second preset temperature, the speed of the main cooling fan 111 of the first cooling branch 11 is controlled according to the engine temperature.

[0072] Please see Figure 2 In some embodiments, the first heat dissipation branch 11 has a main radiator and a main cooling fan 111. The main cooling fan 111 has four speed settings: a, b, c, and d. By gradually switching from speed a to speed d, the fan speed gradually increases, and the fan speed gradually increases, thus gradually increasing the cooling effect on the main radiator. When the engine temperature is between a first preset temperature and a second preset temperature, the engine can be cooled step by step by adjusting the speed setting of the main cooling fan 111 to reasonably control energy consumption. For example, when 93℃≤t1<98℃, the main cooling fan 111 is at speed b; when 98℃≤t1<103℃, the main cooling fan 111 is at speed c; and when 103℃≤t1<106℃, the main cooling fan 111 is at speed d.

[0073] According to some embodiments of the present invention, the heat dissipation device includes a first heat dissipation branch 11 and a second heat dissipation branch 12. In a second operating mode, controlling the heat dissipation device to connect with at least one of the high-temperature cooling branch 21 and the low-temperature cooling branch includes:

[0074] Acquire the accelerator pedal opening signal;

[0075] When the accelerator pedal opening is 0, the first heat dissipation branch 11 is connected to the low temperature cooling branch.

[0076] When the accelerator pedal opening is greater than 0, the first heat dissipation branch 11 is connected to the high-temperature cooling branch 21, and the second heat dissipation branch 12 is connected to the low-temperature cooling branch.

[0077] Please see Figure 2 In some embodiments, the low-temperature cooling branch includes a first cooling branch 22, a second cooling branch 23, and a third cooling branch 24. After the vehicle is in the second working mode, the cooling system 100 collects the opening signal of the accelerator pedal. When the opening of the accelerator pedal is 0, that is, the operator does not press the accelerator pedal, the cooling system 100 controls the first heat dissipation branch 11 to connect with the low-temperature cooling branch, so as to realize the cooling of the vehicle's upper components (oil pump motor, fan motor, water pump motor) by the main radiator, without the need for the heat dissipation device to work at full load, so as to reasonably control energy consumption.

[0078] When the accelerator pedal opening is greater than 0, that is, when the operator presses the accelerator pedal, the cooling system 100 controls the first heat dissipation branch 11 to connect with the high temperature cooling branch 21, and at the same time, the cooling system 100 controls the second heat dissipation branch 12 to connect with the low temperature cooling branch. This allows the main radiator to cool the vehicle's running parts (engine) and the auxiliary radiator to cool the vehicle's superstructure components, thus achieving a reasonable distribution of the cooling power consumption of the cooling system 100 and a good cooling effect.

[0079] In some examples, the control method also includes: acquiring vehicle gear position signal, vehicle speed signal and cleaning operation intensity, and controlling the gear of the main cooling fan 111 of the first heat dissipation branch 11 according to the vehicle gear position signal, vehicle speed signal and cleaning operation intensity.

[0080] In some embodiments, the vehicle has a cleaning operation control switch. The operator can control the intensity of the vehicle cleaning operation by pressing and switching the control switch. Then, the cooling system 100 can detect the control switch pressed by the operator and control the speed of the main cooling fan 111 of the first heat dissipation branch 11 according to the intensity of the cleaning operation, so as to achieve a reasonable distribution of the cooling power consumption of the cooling system 100 and a good cooling effect.

[0081] If the operator does not depress the accelerator pedal, i.e., the accelerator pedal is open to 0, and the vehicle is in first gear, with the speed in the first speed range, and the sweeping intensity is strong sweeping, the main cooling fan 111 is in gear C. Furthermore, if the vehicle is in second gear, with the speed in the second speed range, and the sweeping intensity is standard sweeping, the main cooling fan 111 is in gear B. Furthermore, if the vehicle is in third gear, with the speed in the third speed range, and the sweeping intensity is standard sweeping or sanitation, the main cooling fan 111 is in gear A.

[0082] If the operator presses the accelerator pedal (i.e., when the accelerator pedal opening is greater than 0), and the vehicle is in gear 3 or higher, with the vehicle speed in the fourth speed range, and the cleaning intensity is in the cleaning mode, the cooling system 100 controls the first heat dissipation branch 11 to connect with the high-temperature cooling branch 21, and simultaneously controls the second heat dissipation branch 12 to connect with the low-temperature cooling branch. This allows the main radiator to cool the vehicle's running parts (engine) and the auxiliary radiator to cool the vehicle's upper components, achieving a reasonable distribution of cooling power consumption for the cooling system 100 and providing good cooling effect. At this time, the control logic for connecting the first heat dissipation branch 11 and the high-temperature cooling branch 21 is the same as the control logic in the first working mode, wherein the auxiliary cooling fan 121 is in gear b.

[0083] As the vehicle speed switches from the first speed range to the fourth speed range, the speed can gradually increase. For example, the first speed range is below 5 km / h, the second speed range is between 5 and 10 km / h, the third speed range is between 10 and 15 km / h, and the fourth speed range is above 15 km / h.

[0084] The following is combined Figure 2 According to some specific embodiments of the present invention, the vehicle has a first operating mode and a second operating mode. In the first operating mode, the cooling system 100 can control the coordination between the high-temperature cooling branch 21 and the heat dissipation device according to the engine outlet water temperature. The cooling system 100 can also control the coordination between the first cooling branch 22 and the heat dissipation device according to the accelerator pedal signal and the operating state of the drive motor. In the second operating mode, the cooling system 100 can control the coordination between multiple cooling branches and the heat dissipation device according to the accelerator pedal signal, vehicle speed signal, gear signal and cleaning intensity.

[0085] The heat dissipation device includes a first heat dissipation branch 11 and a second heat dissipation branch 12. The first heat dissipation branch 11 includes a condenser, an intercooler, a main radiator, and a main cooling fan 111. The second heat dissipation branch 12 includes an auxiliary radiator and an auxiliary cooling fan 121. The temperature sensor in the high-temperature cooling branch 21 can measure the engine's outlet water temperature as t1. Both the main cooling fan 111 and the auxiliary cooling fan 121 have four speeds: a, b, c, and d. The fan speed in speed a is 25% of the maximum fan speed, the fan speed in speed b is 50% of the maximum fan speed, the fan speed in speed c is 75% of the maximum fan speed, and the fan speed in speed d is 95% of the maximum fan speed. The higher the fan speed, the higher the heat dissipation efficiency of the radiator for the components that need cooling.

[0086] In the first operating mode of the vehicle, the cooling system 100 can control the coordination between the high-temperature cooling branch 21 and the heat dissipation device according to the engine outlet water temperature. Specifically, when t1 < 93℃, the control device controls the thermostat of the high-temperature cooling branch 21 to close, and the engine water pump can drive the coolant to flow through the engine and the thermostat in sequence, and then flow back to the engine water pump, forming an internal circulation cooling circuit. The control device controls the main cooling fan 111 to the A gear. At this time, the main cooling fan 111 can dissipate heat from the condenser and the intercooler.

[0087] When the temperature is 93℃≤t1<98℃, the control device opens the thermostat and connects the first cooling branch 11 to the high-temperature cooling branch 21 by controlling the first four-way valve 31 and the second four-way valve 32. The engine water pump can drive the cooling water to circulate in the first cooling branch 11 and the high-temperature cooling branch 21, and the control device controls the main cooling fan 111 to the b setting. When the temperature is 98℃≤t1<103℃, the control device can connect the first cooling branch 11 to the high-temperature cooling branch 21, and the engine water pump can drive the cooling water to circulate in the first cooling branch 11 and the high-temperature cooling branch 21. The control device controls the main cooling fan 111 to the c setting. When the temperature is 103℃≤t1<106℃, the control device still connects the first cooling branch 11 to the high-temperature cooling branch 21, and the engine water pump can drive the cooling water to circulate in the first cooling branch 11 and the high-temperature cooling branch 21. The control device controls the main cooling fan 111 to the d setting.

[0088] When t1≥106℃, the control device connects the first heat dissipation branch 11 to the high-temperature cooling branch 21, and controls the main cooling fan 111 to the d gear. At the same time, the control device connects the second heat dissipation branch 12 to the high-temperature cooling branch 21 by controlling the first four-way valve 31 and the second four-way valve 32. That is, the second heat dissipation branch 12 is connected in parallel with the first heat dissipation branch 11. The second heat dissipation branch 12 can play an auxiliary role in heat dissipation. The main radiator and the auxiliary radiator work together to dissipate heat for the engine, thereby improving the heat dissipation effect.

[0089] The cooling system 100 can control the coordination between the first cooling branch 22 and the heat dissipation device according to the accelerator pedal signal and the working status of the drive motor. Specifically, when the drive motor is working and the accelerator pedal opening is greater than or equal to 50%, the drive motor quickly starts the vehicle. The control device controls the first four-way valve 31, the second four-way valve 32 and the third four-way valve 33 to switch the passage so that the first heat dissipation branch 11 and the second heat dissipation branch 12 are both connected to the first cooling branch 22. The electric water pump can drive the cooling water to circulate between the first heat dissipation branch 11 and the first cooling branch 22, and between the second heat dissipation branch 12 and the first cooling branch 22. The auxiliary cooling fan 121 is in the d position, and the control device controls the main cooling fan 111 to the b position. At this time, both the main radiator and the auxiliary radiator are used to dissipate heat for the drive motor and the first controller.

[0090] After the vehicle reaches a certain speed, the engine starts, and the control device controls the first four-way valve 31 to switch the circuit, disconnecting the first cooling branch 11 and the second cooling branch 12. The first cooling branch 11 connects to the high-temperature cooling branch 21, allowing the main radiator to cool the engine. The second cooling branch 12 connects to the first cooling branch 22, allowing the auxiliary radiator to cool the drive motor and the first controller. Based on this, when the drive motor is not working and the first controller needs cooling, the auxiliary cooling fan 121 is controlled to be in position A. When the drive motor is generating electricity, i.e., supplying power to the electrical devices inside the vehicle, the control device... The control device controls the auxiliary cooling fan 121 to gear B. When the drive motor is in the driving state, that is, when the drive motor drives the vehicle or the drive motor and the engine drive the vehicle simultaneously, the control device controls the auxiliary cooling fan 121 to gear C. Furthermore, when the auxiliary radiator is required to assist in cooling the engine, the control device controls the first four-way valve 31 and the second four-way valve 32 to switch the passage so that the second cooling branch 12 is connected to the first cooling branch 11. At this time, the auxiliary cooling fan 121 needs to be upgraded by at least 1 or 2 gears based on the original gear, that is, when the original gear is gear B, it is changed to gear C or gear D.

[0091] Users can switch the vehicle from the first working mode to the second working mode by turning on the switch. The cooling system 100 can control the coordination of multiple cooling branches and heat dissipation devices according to the accelerator pedal signal, vehicle speed signal, gear signal and cleaning intensity. The cleaning intensity is related to the working status of the fan motor, oil pump motor and water pump motor. According to the working status of each motor, the cleaning intensity can be divided into strong sweeping, standard sweeping and maintenance sweeping.

[0092] With the accelerator pedal not depressed, the vehicle in first gear, the speed below 5 km / h, and the sweeping intensity at high speed, the engine is in the internal circulation cooling circuit. The control device controls the first four-way valve 31, the second four-way valve 32, and the third four-way valve 33 to switch the passages, so that the second cooling branch 12 is closed. The first cooling branch 11 is connected to the first cooling branch 22, the second cooling branch 23, and the third cooling branch 24 respectively. The electric water pump can drive the cooling water to circulate in the first cooling branch 11 and the first cooling branch 22, the first cooling branch 11 and the second cooling branch 23, and the first cooling branch 11 and the third cooling branch 24 respectively, so as to realize the cooling system 100 to cool the drive motor and each motor. The control device controls the main cooling fan 111 to the C gear and the control device controls the speed of the auxiliary cooling fan 121 to 0.

[0093] With the accelerator pedal not depressed, the vehicle in 2nd gear, the speed between 5-10 km / h, and the work intensity at standard sweeping level, the engine is in the internal circulation cooling circuit. The control device controls the first four-way valve 31, the second four-way valve 32, and the third four-way valve 33 to switch the passages, so that the second heat dissipation branch 12 is closed. The first heat dissipation branch 11 is connected to the first cooling branch 22, the second cooling branch 23, and the third cooling branch 24 respectively. The electric water pump can drive the cooling water to circulate in the first heat dissipation branch 11 and the first cooling branch 22, the first heat dissipation branch 11 and the second cooling branch 23, and the first heat dissipation branch 11 and the third cooling branch 24 respectively, so as to achieve the cooling system 100 to dissipate heat from the drive motor and each motor. The control device controls the main cooling fan 111 to the b gear and controls the auxiliary cooling fan 121 to the 0 speed.

[0094] With the accelerator pedal not depressed, the vehicle in 3rd gear, and the speed between 10-15 km / h, and the work intensity at the standard sweeping or cleaning level, the engine is in the internal circulation cooling circuit. The control device controls the first four-way valve 31, the second four-way valve 32, and the third four-way valve 33 to switch the passages, so that the second heat dissipation branch 12 is closed. The first heat dissipation branch 11 is connected to the first cooling branch 22, the second cooling branch 23, and the third cooling branch 24 respectively. The electric water pump can drive the cooling water to circulate in the first heat dissipation branch 11 and the first cooling branch 22, the first heat dissipation branch 11 and the second cooling branch 23, and the first heat dissipation branch 11 and the third cooling branch 24 respectively, so as to achieve the cooling system 100 to dissipate heat from the drive motor and each motor. The control device controls the main cooling fan 111 to the A gear and controls the auxiliary cooling fan 121 to the 0 speed.

[0095] When the accelerator pedal is pressed, the vehicle is in gear 3 or higher, the vehicle speed is above 15 km / h, and the work intensity is in the cleaning state, the control device controls the first four-way valve 31, the second four-way valve 32, and the third four-way valve 33 to switch the passages. The first heat dissipation branch 11 is connected to the high-temperature cooling branch 21, the main radiator is for engine cooling, and the second heat dissipation branch 12 is connected to the first cooling branch 22, the second cooling branch 23, and the auxiliary radiator is for motor cooling. The control device controls the auxiliary cooling fan 121 to the b gear. The coordination logic between the first heat dissipation branch 11 and the high-temperature cooling branch 21 follows the first working mode.

[0096] Other configurations and operations of the cooling system 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here. In the description of the present invention, "first feature" and "second feature" may include one or more of the features. The vertical, horizontal, and front-back directions are defined as shown in the figures.

[0097] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0098] In the description of this specification, the references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "with example," or "some examples," etc., mean that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above-mentioned technical terms do not necessarily refer to the same embodiment or example. Furthermore, the described features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0099] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for the cooling system of a hybrid sanitation vehicle, characterized in that, The cooling system of hybrid sanitation vehicles includes: A high-temperature cooling branch, wherein the high-temperature cooling branch has an engine; A low-temperature cooling branch is connected in parallel with the high-temperature cooling branch and includes a first cooling branch, a second cooling branch, and a third cooling branch. The first cooling branch has a first controller and a drive motor, the second cooling branch has an oil pump motor and a fan motor, and the third cooling branch has a water pump motor. The first cooling branch, the second cooling branch, and the third cooling branch are connected in parallel. A heat dissipation device, wherein the heat dissipation device cooperates with the high-temperature cooling branch, the first cooling branch, the second cooling branch, and the third cooling branch via a control valve; A control device, which communicates with the control valve, is used to control the on / off state of the control valve, so that the heat dissipation device can be selectively connected to multiple cooling branches to form a cooling circuit. The vehicle has a first working mode and a second working mode. In the first working mode, the hybrid sanitation vehicle is controlled to be in a driving state, and in the second working mode, the hybrid sanitation vehicle is controlled to be in a sweeping state. The control method includes: Determine the vehicle's operating mode; The hybrid sanitation vehicle is determined to be in the first working mode, and the cooling device is connected to at least one of the high-temperature cooling branch and the first cooling branch. The system determines that the hybrid sanitation vehicle is in the second working mode and controls the heat dissipation device to connect to at least one of the high-temperature cooling branch and the low-temperature cooling branch. The step of determining that the hybrid sanitation vehicle is in the first working mode and controlling the heat dissipation device to connect to at least one of the high-temperature cooling branch and the first cooling branch includes: The opening signal of the accelerator pedal is acquired, and the connection between the heat dissipation device and the first cooling branch is controlled according to the opening of the accelerator pedal. Collect the engine outlet water temperature, and control the connection between the heat dissipation device and the high-temperature cooling branch based on the engine outlet water temperature; The heat dissipation device includes a first heat dissipation branch and a second heat dissipation branch, wherein the first cooling branch, which controls the heat dissipation device to be connected to the low-temperature cooling branch according to the opening degree of the accelerator pedal, includes: When the accelerator pedal opening is greater than the preset opening, the first heat dissipation branch and the second heat dissipation branch are respectively connected to the first cooling branch; After the engine starts, the first heat dissipation branch is disconnected from the first cooling branch; Determine the operating status of the drive motor and control the speed of the auxiliary cooling fan in the second heat dissipation branch according to the operating status of the drive motor; The heat dissipation device includes a first heat dissipation branch and a second heat dissipation branch. In the second operating mode, controlling the heat dissipation device to connect with at least one of the high-temperature cooling branch and the low-temperature cooling branch includes: Acquire the accelerator pedal opening signal; When the accelerator pedal opening is 0, the first heat dissipation branch is connected to the low-temperature cooling branch; When the accelerator pedal opening is greater than 0, the first heat dissipation branch is connected to the high-temperature cooling branch, and the second heat dissipation branch is connected to the low-temperature cooling branch.

2. The control method for the cooling system of the hybrid sanitation vehicle according to claim 1, characterized in that, The heat dissipation device includes: a first heat dissipation branch and a second heat dissipation branch. The first heat dissipation branch includes a condenser, an intercooler, a main radiator, and a main cooling fan. The second heat dissipation branch includes an auxiliary radiator and an auxiliary cooling fan. The control valve includes a first four-way valve and a second four-way valve. The outlets of the first and second heat dissipation branches are connected through the first four-way valve, and the first four-way valve is connected to multiple cooling branches. The inlets of the first and second heat dissipation branches are connected through the second four-way valve, and the second four-way valve is connected to multiple cooling branches.

3. The control method for the cooling system of the hybrid sanitation vehicle according to claim 2, characterized in that, It also includes a secondary water tank, which is connected to the main radiator and the secondary radiator respectively to form a filling and degassing circuit; and / or, the inlet of the first cooling branch, the inlet of the second cooling branch, and the inlet of the third cooling branch are connected through a third four-way valve, which is located upstream of the second four-way valve.

4. The control method for the cooling system of a hybrid sanitation vehicle according to any one of claims 1-3, characterized in that, The high-temperature cooling branch also includes a thermostat and an engine water pump, wherein the thermostat is connected to the inlet of the engine water pump to form an internal circulation cooling circuit when the thermostat is closed; and / or, each cooling branch has a temperature sensor that communicates with the control device.

5. The control method according to claim 1, characterized in that, The heat dissipation device includes a first heat dissipation branch and a second heat dissipation branch, and controlling the connection between the heat dissipation device and the high-temperature cooling branch according to the engine's outlet water temperature includes: When the engine temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the first heat dissipation branch is connected to the high-temperature cooling branch. When the engine temperature is greater than or equal to a second preset temperature, the first and second heat dissipation branches are respectively connected to the high-temperature cooling branch. When the engine temperature is greater than or equal to a first preset temperature and less than a second preset temperature, the speed of the main cooling fan in the first cooling branch is controlled according to the engine temperature.

6. The control method according to claim 1, characterized in that, Also includes: The system collects vehicle gear position signals, vehicle speed signals, and cleaning operation intensity, and controls the gear of the main cooling fan in the first cooling branch based on these signals.

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