Heating device for electric mixer truck and electric mixer truck

Abstract

The present invention provides a heating device for an electric mixer truck and an electric mixer truck, including: a battery water circuit, a motor cooling water circuit, an upper-mounted hydraulic cooling device, and a VCU. A temperature sensor detects the temperature of the battery, and the temperature of the battery includes the minimum temperature and the maximum temperature. The controller compares the minimum temperature and the maximum temperature with a first preset temperature threshold respectively. When the VCU detects that the whole vehicle is in a non-working state, it controls the four-way valve to be in a disconnected state, so as to separate the battery water circuit and the motor cooling water circuit, and controls the first three-way valve to bypass the oil-water heat exchanger; or when it detects that the whole vehicle is in a working state, it controls the four-way valve to switch to a connected state, so as to connect the battery water circuit and the motor cooling water circuit in series, and controls the first three-way valve to open, so that the hydraulic oil exchanges heat with the coolant, maintaining the battery temperature, improving the low-temperature discharge performance of the battery, reducing the viscosity of the hydraulic oil, improving the driving ability of the upper-mounted hydraulic cooling device, and having high safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of electric mixer truck control, and in particular to a heating device for an electric mixer truck and an electric mixer truck. Background Art

[0002] There are numerous battery packs in an electric mixer truck. When the whole vehicle is in a low-temperature environment, the heating power of the battery packs is large, which greatly affects the driving range and working hours of the whole vehicle.

[0003] An electric mixer truck has working conditions such as loading, waiting for materials, and queuing for discharging materials, and the time occupied by such working conditions is relatively high. When the whole vehicle is not running and only feeding or discharging materials, in a low-temperature environment (below 15°C), the output current of the battery is small, and the battery cannot maintain its temperature by itself, resulting in a decrease in the battery output performance and an increase in heating energy consumption. In a low-temperature environment, the oil temperature of the upper-mounted hydraulic cooling device is also low, the viscosity of the hydraulic oil is high, and the driving ability decreases.

[0004] Currently, for heating the battery of an electric mixer truck, an electric heating film, a PTC heater, and the heat output by the motor during operation are used. When using an electric heating film to heat the battery, the heating energy consumption is high, the safety performance is low, and problems such as abnormal temperature control and uneven heating are likely to occur in the electric heating film; when a PTC heater is added to the battery water circuit to heat the water and then heat the battery, although the safety performance is good, there is still a problem of high heating energy consumption, and since there are many batteries, multiple PTC heaters need to be connected in series for heating, resulting in high costs; when using the heat output by the motor during operation to heat the battery, there are problems such as working condition differences and low waste heat utilization efficiency. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a heating device for an electric mixer truck and an electric mixer truck. In a low-temperature environment, by combining the battery water circuit, the motor cooling water circuit, and the upper-mounted hydraulic cooling device, heating of the battery can be achieved, the battery temperature can be maintained, the low-temperature discharge performance of the battery can be improved, the viscosity of the hydraulic oil can be reduced, the driving ability of the upper-mounted hydraulic cooling device can be improved, and the safety performance is high.

[0006] In the first aspect, an embodiment of the present invention provides a heating device for an electric mixer truck. The device includes: a battery water circuit, a motor cooling water circuit, an upper-mounted hydraulic cooling device, and a vehicle controller VCU. Both the battery water circuit and the motor cooling water circuit include a four-way valve. The battery water circuit includes a battery pack, and the battery pack includes a temperature sensor, a battery, and a controller. The upper-mounted hydraulic cooling device includes a first three-way valve;

[0007] The battery water circuit, the motor cooling water circuit, and the upper-mounted hydraulic cooling device are respectively connected to the VCU, and the battery water circuit is respectively connected to the motor cooling water circuit and the upper-mounted hydraulic cooling device;

[0008] The temperature sensor is used to detect the temperature of the battery;

[0009] The controller is used to convert the temperature of the battery into command information and send it to the VCU;

[0010] The VCU is used to control the connection state of the four-way valve and the connection state of the first three-way valve according to the command information and the vehicle state information. Further, the temperature of the battery includes the minimum temperature and the maximum temperature of the battery;

[0011] The controller is used to compare the minimum temperature and the maximum temperature with a first preset temperature threshold respectively. If the minimum temperature is greater than the first preset temperature threshold, a first command information is sent to the VCU; if the maximum temperature is less than the first preset temperature threshold, a second command information is sent to the VCU.

[0012] Further, both the battery water circuit and the vehicle-mounted hydraulic cooling device include an oil-water heat exchanger;

[0013] The VCU is used to control the four-way valve to be in a disconnected state according to the first command information when it detects that the vehicle is in a non-working state, so as to separate the battery water circuit and the motor cooling water circuit, and control the first three-way valve to bypass the oil-water heat exchanger; or when it detects that the vehicle is in a working state, control the four-way valve to switch to a connected state according to the second command information, so as to connect the battery water circuit and the motor cooling water circuit in series, and control the first three-way valve to open, so that the hydraulic oil in the vehicle-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit.

[0014] Further, the battery water circuit further includes a first water pump, a second water temperature sensor, a first water temperature sensor, a plate heat exchanger and a positive temperature coefficient PTC heater. The PTC heater, the first water pump, the second water temperature sensor, the battery pack, the first water temperature sensor, the plate heat exchanger, the four-way valve and the oil-water heat exchanger are connected in sequence, and the PTC heater is connected to the oil-water heat exchanger;

[0015] The motor cooling water circuit further includes a second water pump, a load, a second three-way valve, a radiator and a second three-way joint. The second water pump, the load, the four-way valve, the second three-way valve, the radiator and the second three-way joint are connected in sequence, and the second three-way joint is connected to the second water pump. Among them, the load includes an auxiliary control, a main drive controller, a main drive motor, a vehicle-mounted controller and a vehicle-mounted motor;

[0016] The upper hydraulic cooling device further includes an oil pump, a motor, a first three-way valve, and an oil radiator. The oil pump, the motor, the first three-way valve, the oil-water heat exchanger, the first three-way valve, and the oil radiator are connected in sequence, and the oil radiator is connected to the oil pump.

[0017] Further, the motor cooling water circuit further includes a third water temperature sensor, and the third water temperature sensor is respectively connected to the four-way valve and the load.

[0018] The upper hydraulic cooling device further includes an oil temperature sensor, and the oil temperature sensor is respectively connected to the first three-way valve and the motor.

[0019] Further, the VCU is configured to, when detecting that the whole vehicle is in a driving state, control the four-way valve to switch to a connected state according to the heating request information in the second instruction information, so that the battery water circuit and the motor cooling water circuit are connected in series, and turn on the first water pump and the second water pump, and transfer the heat output by the load to the battery water circuit through the first water pump and the second water pump to heat the battery pack.

[0020] Further, the third water temperature sensor is configured to detect the first water temperature after the heat is output from the load.

[0021] The VCU is configured to compare the first water temperature with a second preset temperature threshold, a third preset temperature threshold, and a fourth preset temperature threshold.

[0022] If the first water temperature is less than the second preset temperature threshold, then control the second three-way valve to be in a bypass state to bypass the radiator, and control the PTC heater to heat the battery water circuit.

[0023] If the first water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, then control the PTC heater to switch from the heating state to the off state.

[0024] If the first water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in a connected state to allow the coolant to flow through the radiator for heat dissipation.

[0025] Further, the VCU is configured to, when the lowest temperature of the battery reaches the second preset temperature threshold, control the four-way valve to switch to the disconnected state to separate the battery water circuit and the motor cooling water circuit.

[0026] Further, the VCU is configured to, when detecting that the mixing drum on the vehicle body is in the working state, control the four-way valve to switch to the connected state according to the heating request information in the second command information, so that the battery water circuit and the motor cooling water circuit are connected in series, and turn on the first water pump and the second water pump to deliver the heat output by the load to the battery water circuit through the first water pump and the second water pump, and heat the battery pack; and control the first three-way valve to open, so that the hydraulic oil in the on-vehicle hydraulic cooling device exchanges heat with the coolant in the battery water circuit.

[0027] Further, the second water temperature sensor is configured to detect the second water temperature entering the battery pack;

[0028] The oil temperature sensor is configured to detect the temperature of the hydraulic oil;

[0029] The VCU is configured to compare the second water temperature with a second preset temperature threshold. If the second water temperature is less than the second preset temperature threshold, control the second three-way valve to be in the bypass state to bypass the radiator, and control the PTC heater to heat the battery water circuit;

[0030] Compare the temperature of the hydraulic oil with the first preset temperature threshold. If the temperature of the hydraulic oil is less than the first preset temperature threshold, control the first three-way valve to be in the bypass state to bypass the oil-water heat exchanger, and the hydraulic oil does not exchange heat with the coolant.

[0031] Further, the VCU is configured to, when the lowest temperature of the battery reaches the second preset temperature threshold and the temperature of the hydraulic oil is less than the first preset temperature threshold, control the first three-way valve to be in the connected state, so that the hydraulic oil flows through the oil-water heat exchanger for heat exchange, thereby heating the hydraulic oil;

[0032] When the highest temperature of the battery reaches the fifth preset temperature threshold, the temperature of the hydraulic oil reaches the second preset temperature threshold, or the second water temperature is greater than the fourth preset temperature threshold, control the four-way valve to be in the disconnected state to separate the battery water circuit and the motor cooling water circuit, and close the first three-way valve to bypass the oil-water heat exchanger, and turn off the PTC heater.

[0033] Further, the VCU is configured to compare the second water temperature with the second preset temperature threshold, the third preset temperature threshold, and the fourth preset temperature threshold respectively, and compare the temperature of the hydraulic oil with the third preset temperature threshold;

[0034] If the second water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, control the second three-way valve to be in the bypass state to bypass the radiator, and control the PTC heater to be turned off;

[0035] If the temperature of the hydraulic oil is greater than the third preset temperature threshold, control the first three-way valve to open so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit;

[0036] If the second water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in the connected state so that the coolant flows through the radiator for heat dissipation, and control the first three-way valve to be in the bypass state to bypass the oil-water heat exchanger, and the hydraulic oil does not exchange heat with the coolant.

[0037] In a second aspect, an embodiment of the present invention provides an electric mixer truck, including the heating device of the electric mixer truck as described above.

[0038] An embodiment of the present invention provides a heating device for an electric mixer truck and an electric mixer truck, including: a battery water circuit, a motor cooling water circuit, an upper-mounted hydraulic cooling device, and a VCU. Both the battery water circuit and the motor cooling water circuit include four-way valves. The battery water circuit includes a battery pack, and the battery pack includes a temperature sensor, a battery, and a controller. The upper-mounted hydraulic cooling device includes a first three-way valve. Both the battery water circuit and the upper-mounted hydraulic cooling device include oil-water heat exchangers; the battery water circuit, the motor cooling water circuit, and the upper-mounted hydraulic cooling device are respectively connected to the VCU, and the battery water circuit is respectively connected to the motor cooling water circuit and the upper-mounted hydraulic cooling device; the temperature sensor is used to detect the temperature of the battery, and the temperature of the battery includes the minimum temperature and the maximum temperature of the battery; the controller is used to compare the minimum temperature and the maximum temperature with the first preset temperature threshold respectively. If the minimum temperature is greater than the first preset temperature threshold, send a first instruction message to the VCU; if the maximum temperature is less than the first preset temperature threshold, send a second instruction message to the VCU; the VCU is used to control the four-way valve to be in the disconnected state according to the first instruction message when detecting that the whole vehicle is in a non-working state, so as to separate the battery water circuit and the motor cooling water circuit, and control the first three-way valve to bypass the oil-water heat exchanger; or when detecting that the whole vehicle is in a working state, control the four-way valve to switch to the connected state according to the second instruction message, so that the battery water circuit and the motor cooling water circuit are connected in series, and control the first three-way valve to open, so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit, which can maintain the battery temperature, improve the low-temperature discharge performance of the battery, and reduce the viscosity of the hydraulic oil, improve the driving ability of the upper-mounted hydraulic cooling device, and has high safety performance.

[0039] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention are realized and attained by the structure particularly pointed out in the specification, claims as well as the drawings.

[0040] To make the above objectives, features and advantages of the present invention more comprehensible, the following specific preferred embodiments are given and detailed descriptions are provided in conjunction with the accompanying drawings as follows. Description of the Drawings

[0041] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0042] Figure 1 Structural schematic diagram of the heating device of an existing electric mixer truck;

[0043] Figure 2 Structural schematic diagram of the heating device of another existing electric mixer truck;

[0044] Figure 3 Structural schematic diagram of the heating device of yet another existing electric mixer truck;

[0045] Figure 4 Schematic diagram of the heating device of the electric mixer truck provided in Embodiment 1 of the present invention;

[0046] Figure 5 Structural schematic diagram of the heating device of the electric mixer truck provided in Embodiment 2 of the present invention;

[0047] Figure 6 Structural schematic diagram of the heating device of another electric mixer truck provided in Embodiment 2 of the present invention;

[0048] Figure 7 Structural schematic diagram of the heating device of yet another electric mixer truck provided in Embodiment 2 of the present invention. Detailed Description of the Embodiments

[0049] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0050] Electric mixer trucks have a large number of battery packs. When the vehicle is in a low-temperature environment, the heating power of the battery packs is large, which greatly affects the vehicle's cruising range and working hours.

[0051] Electric mixer trucks have working conditions such as loading, waiting for materials, and queuing for unloading, and the time occupied by such working conditions is relatively high. When the vehicle is not running and only loading or unloading, in a low-temperature environment (below 15°C), the battery output current is small, and the battery cannot maintain its temperature by itself, resulting in a decrease in battery output performance and an increase in heating energy consumption. In a low-temperature environment, the oil temperature of the upper-mounted hydraulic cooling device is also low, the viscosity of the hydraulic oil is high, and the driving ability decreases.

[0052] Currently, for the battery heating of electric mixer trucks, electric heating films, PTC heaters, and the heat output by the motor during operation are used.

[0053] Refer to Figure 1 , when using an electric heating film to heat the battery, the heating energy consumption is high, the safety performance is low, and problems such as abnormal temperature control and uneven heating are likely to occur in the electric heating film.

[0054] Refer to Figure 2 , when adding a PTC heater to the battery water circuit to heat the water and then heat the battery, although the safety performance is good, there is still a problem of high heating energy consumption, and due to the large number of batteries, multiple PTC heaters need to be connected in series for heating, resulting in high costs.

[0055] Refer to Figure 3 , when using the heat output by the motor during operation to heat the battery, there are problems such as working condition differences and low waste heat utilization efficiency.

[0056] For the convenience of understanding this embodiment, the embodiments of the present invention will be introduced in detail below.

[0057] Embodiment 1:

[0058] Figure 4 It is a schematic diagram of the heating device of the electric mixer truck provided by the first embodiment of the present invention.

[0059] Refer to Figure 4 , the device includes: a battery water circuit, a motor cooling water circuit, an upper-mounted hydraulic cooling device, and a VCU (Vehicle Control Unit, vehicle controller). Both the battery water circuit and the motor cooling water circuit include four-way valves. The battery water circuit includes battery packs, and each battery pack includes a temperature sensor, a battery, and a controller. The upper-mounted hydraulic cooling device includes a first three-way valve. Both the battery water circuit and the upper-mounted hydraulic cooling device include an oil-water heat exchanger;

[0060] The battery water circuit, the motor cooling water circuit, and the upper-mounted hydraulic cooling device are respectively connected to the VCU, and the battery water circuit is respectively connected to the motor cooling water circuit and the upper-mounted hydraulic cooling device;

[0061] A temperature sensor for detecting the temperature of the battery;

[0062] A controller for converting the temperature of the battery into command information and sending it to the VCU;

[0063] The VCU is used to control the connection state of the four-way valve and the connection state of the first three-way valve according to the command information and the vehicle state information.

[0064] Further, the temperature of the battery includes the minimum temperature and the maximum temperature of the battery. The controller is used to compare the minimum temperature and the maximum temperature with the first preset temperature threshold respectively. If the minimum temperature is greater than the first preset temperature threshold, the first command information is sent to the VCU; if the maximum temperature is less than the first preset temperature threshold, the second command information is sent to the VCU;

[0065] Specifically, the battery pack includes a temperature sensor and a controller. The temperature sensor is used to detect the temperature of the battery. Among them, the temperature of the battery includes the minimum temperature and the maximum temperature; the temperature sensor sends the minimum temperature and the maximum temperature to the controller; when the minimum temperature is greater than the first preset temperature threshold, the controller sends the first command information to the VCU, indicating that the temperature of the battery is in a good temperature range and the battery working performance is good, and there is no need to heat the battery; when the maximum temperature is less than the first preset temperature threshold, it indicates that the temperature of the battery is relatively low at this time, and heating methods need to be used to heat the battery.

[0066] Further, the VCU is used to control the four-way valve to be in the off state according to the first command information when it detects that the vehicle is in a non-working state, so as to separate the battery water circuit and the motor cooling water circuit, and control the first three-way valve to bypass the oil-water heat exchanger; or when it detects that the vehicle is in a working state, control the four-way valve to switch to the connected state according to the second command information, so as to connect the battery water circuit and the motor cooling water circuit in series, and control the first three-way valve to open, so that the hydraulic oil in the upper hydraulic cooling device exchanges heat with the coolant in the battery water circuit.

[0067] In this embodiment, when the lowest temperature of the battery is greater than the first preset temperature threshold and the VCU detects that the whole vehicle is in a non-operating state, it controls the four-way valve to be in the off state according to the first command information, so as to separate the battery water circuit and the motor cooling water circuit, and controls the first three-way valve to bypass the oil-water heat exchanger, that is, the hydraulic oil in the upper-mounted hydraulic cooling device does not pass through the oil-water heat exchanger; when it is detected that the whole vehicle is in an operating state (the whole vehicle is driving and / or the upper-mounted mixing drum is working), and at this time the highest temperature of the battery is less than the first preset temperature threshold, it controls the four-way valve to switch to the connected state according to the second command information, so as to connect the battery water circuit and the motor cooling water circuit in series, and controls the first three-way valve to open, so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit, thereby heating the battery, maintaining the battery temperature, and improving the low-temperature discharge performance of the battery.

[0068] Embodiment Two:

[0069] Figure 5 It is a schematic structural diagram of the heating device of the electric mixer truck provided in Embodiment Two of the present invention.

[0070] Refer to Figure 5 , the device includes: a battery water circuit, a motor cooling water circuit, an upper-mounted hydraulic cooling device and a VCU (not shown), and further includes an air-conditioning device. According to the refrigerant flow direction, the air-conditioning device mainly includes the following components: a compressor, a pressure / temperature sensor (PT), an electronic expansion valve 1, a solenoid valve, an electronic expansion valve 2, a plate heat exchanger, an evaporator and a condenser; the evaporator and the plate heat exchanger are connected in parallel for refrigeration. The air-conditioning device is respectively connected to the battery water circuit, the motor cooling water circuit, and the VCU. Among them, when the four-way valve is in the off state, the battery water circuit and the motor cooling water circuit are separated, and the connection state of the four-way valve in Figure 5 can be referred to; when the four-way valve is in the connected state, the battery water circuit and the motor cooling water circuit are connected in series, and the connection state of the four-way valve as shown in Figure 7 can be referred to.

[0071] The battery water circuit further includes a first water pump, a second water temperature sensor, a first water temperature sensor, a plate heat exchanger and a PTC (Positive Temperature Coefficient) heater. The PTC heater, the first water pump, the second water temperature sensor, the battery pack, the first water temperature sensor, the plate heat exchanger, the four-way valve and the oil-water heat exchanger are connected in sequence, and the PTC heater is connected to the oil-water heat exchanger;

[0072] Among them, the plate heat exchanger is mainly used for battery cooling heat exchange, that is, when the battery needs cooling, it exchanges heat with the air-conditioning device to reduce the temperature of the coolant in the battery water circuit, thereby cooling the battery. The plate heat exchanger is the heat exchange component between the battery water circuit and the air-conditioning device.

[0073] The motor cooling water circuit further includes a second water pump, a load, a second three-way valve, a radiator, and a second three-way joint. The second water pump, the load, the four-way valve, the second three-way valve, the radiator, and the second three-way joint are connected in sequence. The second three-way joint is connected to the second water pump. Among them, the load includes an auxiliary controller, a main drive controller, a main drive motor, an upper-mounted controller, and an upper-mounted motor. When the interfaces 2 and 3 of the second three-way valve are connected, the second three-way valve is in communication. When the interfaces 1 and 2 of the second three-way valve are connected, the second three-way valve is bypassed.

[0074] Among them, the main drive controller is connected in series with the main drive motor, and the upper-mounted controller is connected in series with the upper-mounted motor. Then they are connected in parallel and then connected to the battery water circuit. The radiator is connected to the battery water circuit through the second three-way joint and the second three-way valve.

[0075] The upper-mounted hydraulic cooling device further includes an oil pump, a motor, a first three-way valve, and an oil radiator. The oil pump, the motor, the first three-way valve, the oil-water heat exchanger, the first three-way joint, and the oil radiator are connected in sequence. The oil radiator is connected to the oil pump. Among them, the first three-way valve and the first three-way joint realize the bypass of the oil-water heat exchanger. The first three-way valve and the second three-way valve can be switched. The first three-way joint and the second three-way joint are provided with three interfaces and cannot be adjusted. When the interfaces 1 and 2 of the first three-way valve are connected, the first three-way valve is in communication. When the interfaces 2 and 3 of the first three-way valve are connected, the first three-way valve is bypassed.

[0076] Further, in addition to the above components, the motor cooling water circuit further includes a third water temperature sensor, which is respectively connected to the four-way valve and the load.

[0077] In addition to the above components, the upper-mounted hydraulic cooling device further includes an oil temperature sensor, which is respectively connected to the first three-way valve and the motor.

[0078] Further, referring to Figure 7 , the VCU is configured to, when detecting that the whole vehicle is in a driving state, control the four-way valve to switch to the communication state according to the heating request information in the second instruction information, so that the battery water circuit and the motor cooling water circuit are connected in series, and turn on the first water pump and the second water pump, and convey the heat output by the load to the battery water circuit through the first water pump and the second water pump, and heat the battery pack.

[0079] Further, the third water temperature sensor is configured to detect the first water temperature after the heat is output from the load.

[0080] The VCU is configured to compare the first water temperature with a second preset temperature threshold, a third preset temperature threshold, and a fourth preset temperature threshold.

[0081] If the first water temperature is less than the second preset temperature threshold, then control the second three-way valve to be in the bypass state to bypass the radiator, and control the PTC heater to heat the battery water circuit.

[0082] If the first water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, control the PTC heater to switch from the heating state to the off state;

[0083] When the first water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in the connected state so that the coolant flows through the radiator for heat dissipation.

[0084] Further, referring to Figure 6 , the VCU is used to control the four-way valve to switch to the disconnected state when the lowest temperature of the battery reaches the second preset temperature threshold, so as to separate the battery water circuit and the motor cooling water circuit.

[0085] Here, the first preset temperature threshold is 10°C, the second preset temperature threshold is 20°C, the third preset temperature threshold is 30°C, the fourth preset temperature threshold is 60°C, and the fifth preset temperature threshold is 40°C.

[0086] Specifically, when the vehicle is in the driving state and the highest temperature of the battery is less than the first preset temperature threshold, the controller in the battery pack sends the second command information including the heating request information to the VCU, and the VCU controls the four-way valve to switch to the connected state so that the battery water circuit and the motor cooling water circuit are connected in series, and turns on the first water pump and the second water pump to transport the heat output by the load to the battery water circuit through the first water pump and the second water pump, and heats the battery pack.

[0087] The third water temperature sensor arranged at the load detects the first water temperature after the heat output from the load. When the first water temperature is less than the second preset temperature threshold, control the second three-way valve to switch to bypass the radiator, the coolant does not pass through the radiator, and turn on the PTC heater to heat the battery water circuit;

[0088] Since the heat output by the load is unstable, when the first water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, the second three-way valve is still in the bypass state to bypass the radiator, the coolant does not pass through the radiator, and control the PTC heater to switch from the heating state to the off state;

[0089] When the first water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in the connected state so that the coolant flows through the radiator for heat dissipation, and turn on the cooling fan to prevent the battery from generating a large temperature difference due to excessive heating water temperature;

[0090] During the above heating process, the temperature sensor in the battery pack detects the temperature of the battery in real time. When the lowest temperature of the battery reaches the second preset temperature threshold, turn off the heating mode of the battery, and the VCU controls the four-way valve to switch to the disconnected state to separate the battery water circuit and the motor cooling water circuit. The motor cooling can be cooled according to the cooling strategy, which will not be elaborated here.

[0091] Further, the VCU is configured to, when it detects that the mixing drum on the vehicle body is in a working state, control the four-way valve to switch to a connected state according to the heating request information in the second instruction information, so that the battery water circuit and the motor cooling water circuit are connected in series, and turn on the first water pump and the second water pump to deliver the heat output by the load to the battery water circuit through the first water pump and the second water pump to heat the battery pack; and control the first three-way valve to open so that the hydraulic oil in the hydraulic cooling device on the vehicle body exchanges heat with the coolant in the battery water circuit.

[0092] Further, the second water temperature sensor is configured to detect the second water temperature entering the battery pack;

[0093] The oil temperature sensor is configured to detect the temperature of the hydraulic oil;

[0094] The VCU is configured to compare the second water temperature with the second preset temperature threshold. If the second water temperature is less than the second preset temperature threshold, it controls the second three-way valve to be in a bypass state to bypass the radiator, and controls the PTC heater to heat the battery water circuit;

[0095] Compare the temperature of the hydraulic oil with the first preset temperature threshold. If the temperature of the hydraulic oil is less than the first preset temperature threshold, control the first three-way valve to be in a bypass state to bypass the oil-water heat exchanger, and the hydraulic oil does not exchange heat with the coolant.

[0096] Further, the VCU is configured to, when the lowest temperature of the battery reaches the second preset temperature threshold and the temperature of the hydraulic oil is less than the first preset temperature threshold, control the first three-way valve to be in a connected state so that the hydraulic oil flows through the oil-water heat exchanger for heat exchange, thereby heating the hydraulic oil; at this time, the temperature of the hydraulic oil rises and the viscosity of the hydraulic oil decreases, which can improve the driving ability of the hydraulic cooling device on the vehicle body and has high safety performance.

[0097] When the highest temperature of the battery reaches the fifth preset temperature threshold, the temperature of the hydraulic oil reaches the second preset temperature threshold or the second water temperature is greater than the fourth preset temperature threshold, control the four-way valve to be in a disconnected state to separate the battery water circuit and the motor cooling water circuit, and close the first three-way valve to bypass the oil-water heat exchanger, and turn off the PTC heater.

[0098] Specifically, the working state of the upper mixing drum includes the mixing drum working when the whole vehicle is stationary and the upper mixing drum working when the whole vehicle is moving. When the upper mixing drum of the whole vehicle is in the working state and the highest temperature of the battery is less than the first preset temperature threshold, the controller in the battery pack sends the second command information including the heating request information to the VCU. The VCU controls the four-way valve to switch to the connected state, so that the battery water circuit and the motor cooling water circuit are connected in series, and turns on the first water pump and the second water pump to transport the heat output by the load to the battery water circuit through the first water pump and the second water pump, and heats the battery pack; and controls the first three-way valve to open, so that the hydraulic oil in the upper hydraulic cooling device exchanges heat with the coolant in the battery water circuit;

[0099] After heating the battery in the battery water circuit, the second water temperature entering the battery pack continuously rises. The second water temperature sensor detects the second water temperature in real time. When the second water temperature is less than the second preset temperature threshold, the second three-way valve is controlled to be in the bypass state to bypass the radiator, and the PTC heater is controlled to heat the battery water circuit; the temperature of the hydraulic oil is detected by the oil temperature sensor. When the temperature of the hydraulic oil is less than the first preset temperature threshold, the first three-way valve is controlled to be in the bypass state to bypass the oil-water heat exchanger, and the hydraulic oil does not exchange heat with the coolant. This is because the temperature of the hydraulic oil in the upper hydraulic cooling device is relatively low, and at this time, it is no longer possible to exchange heat with the battery water circuit through the oil-water heat exchanger.

[0100] During the process of heating the battery, the temperature of the battery continuously rises. The temperature sensor detects the temperature of the battery in real time. When the lowest temperature of the battery reaches the second preset temperature threshold and the temperature of the hydraulic oil is less than the first preset temperature threshold, the first three-way valve is controlled to be in the connected state, so that the hydraulic oil flows through the oil-water heat exchanger for heat exchange, thereby heating the hydraulic oil. This is because the temperature of the battery water circuit is relatively high, while the temperature of the hydraulic oil is relatively low. At this time, the first three-way valve is controlled to open to heat the hydraulic oil, so that the temperature of the hydraulic oil rises.

[0101] When the highest temperature of the battery reaches the fifth preset temperature threshold, the temperature of the hydraulic oil reaches the second preset temperature threshold or the second water temperature is greater than the fourth preset temperature threshold, the four-way valve is controlled to be in the disconnected state to separate the battery water circuit and the motor cooling water circuit, and the first three-way valve is closed to bypass the oil-water heat exchanger, and the PTC heater is turned off.

[0102] Furthermore, the VCU is used to compare the second water temperature with the second preset temperature threshold, the third preset temperature threshold and the fourth preset temperature threshold respectively, and compare the temperature of the hydraulic oil with the third preset temperature threshold;

[0103] If the second water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, the second three-way valve is controlled to be in the bypass state to bypass the radiator, and the PTC heater is controlled to be turned off;

[0104] If the temperature of the hydraulic oil is greater than the third preset temperature threshold, control the first three-way valve to open so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit;

[0105] If the second water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in a connected state so that the coolant flows through the radiator for heat dissipation, and control the first three-way valve to be in a bypass state so that the oil-water heat exchanger is bypassed and the hydraulic oil does not exchange heat with the coolant.

[0106] Specifically, when the second water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, control the second three-way valve to be in a bypass state to bypass the radiator, and control the PTC heater to switch from the heating state to the off state; if the temperature of the hydraulic oil is greater than the third preset temperature threshold, control the first three-way valve to open so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit; as the water temperature in the battery water circuit continues to rise, when the second water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in a connected state so that the coolant flows through the radiator for heat dissipation, and control the first three-way valve to be in a bypass state so that the oil-water heat exchanger is bypassed and the hydraulic oil does not exchange heat with the coolant, thereby preventing a large temperature difference in the battery caused by too high water temperature after heating.

[0107] This application is applicable to the heat scheduling of each component of the whole vehicle of the mixer truck in different operating scenarios, which can reduce energy consumption and increase the working time of the mixer truck. In a low-temperature environment, through the interaction of the battery water circuit, the motor cooling water circuit and the upper-mounted hydraulic cooling device, the battery is heated to maintain the battery temperature and improve the discharge performance of the battery under low-temperature conditions. And when the temperature of the hydraulic oil is low, control the first three-way valve to open to heat the hydraulic oil, thereby reducing the viscosity of the hydraulic oil and improving the driving ability of the upper-mounted hydraulic cooling device. The heating method adopted in this application has high safety performance.

[0108] In a second aspect, an embodiment of the present invention provides an electric mixer truck, including the heating device of the electric mixer truck as described above.

[0109] An embodiment of the present invention provides a heating device and an electric mixer truck for an electric mixer truck, including: a battery water circuit, a motor cooling water circuit, an upper-mounted hydraulic cooling device, and a VCU. Both the battery water circuit and the motor cooling water circuit include four-way valves. The battery water circuit includes a battery pack, and the battery pack includes a temperature sensor, a battery, and a controller. The upper-mounted hydraulic cooling device includes a first three-way valve. Both the battery water circuit and the upper-mounted hydraulic cooling device include an oil-water heat exchanger; the battery water circuit, the motor cooling water circuit, and the upper-mounted hydraulic cooling device are respectively connected to the VCU, and the battery water circuit is respectively connected to the motor cooling water circuit and the upper-mounted hydraulic cooling device; the temperature sensor is used to detect the temperature of the battery, and the temperature of the battery includes the minimum temperature and the maximum temperature of the battery; the controller is used to compare the minimum temperature and the maximum temperature with a first preset temperature threshold respectively. If the minimum temperature is greater than the first preset temperature threshold, a first instruction message is sent to the VCU; if the maximum temperature is less than the first preset temperature threshold, a second instruction message is sent to the VCU; the VCU is used to control the four-way valve to be in an off state according to the first instruction message when it detects that the whole vehicle is in a non-working state, so as to separate the battery water circuit and the motor cooling water circuit, and control the first three-way valve to bypass the oil-water heat exchanger; or when it detects that the whole vehicle is in a working state, control the four-way valve to switch to a connected state according to the second instruction message, so as to connect the battery water circuit and the motor cooling water circuit in series, and control the first three-way valve to open, so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit, which can maintain the battery temperature, improve the low-temperature discharge performance of the battery, and reduce the viscosity of the hydraulic oil, improve the driving ability of the upper-mounted hydraulic cooling device, and has high safety performance.

[0110] The computer program product provided by the embodiment of the present invention includes a computer-readable storage medium storing program codes, and the instructions included in the program codes can be used to execute the methods described in the foregoing method embodiments. For specific implementation, reference can be made to the method embodiments, which will not be elaborated here.

[0111] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described devices and devices can refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated here.

[0112] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0113] When the above-described functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0114] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0115] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the technical field of the present invention can still modify the technical solutions described in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A heating device for an electric mixer truck, characterized in that, The device includes: a battery water circuit, a motor cooling water circuit, an upper-mounted hydraulic cooling device, and a vehicle controller VCU. The battery water circuit and the motor cooling water circuit both include a four-way valve. The battery water circuit includes a battery pack, and the battery pack includes a temperature sensor, a battery, and a controller. The upper-mounted hydraulic cooling device includes a first three-way valve; The battery water circuit, the motor cooling water circuit, and the upper-mounted hydraulic cooling device are respectively connected to the VCU, and the battery water circuit is respectively connected to the motor cooling water circuit and the upper-mounted hydraulic cooling device; The temperature sensor is used to detect the temperature of the battery; the controller is used to convert the temperature of the battery into command information and send it to the VCU; the VCU is used to control the connection state of the four-way valve and the connection state of the first three-way valve according to the command information and the vehicle state information; The temperature of the battery includes the minimum temperature and the maximum temperature of the battery; The controller is used to compare the minimum temperature and the maximum temperature with a first preset temperature threshold respectively. If the minimum temperature is greater than the first preset temperature threshold, it sends the first command information to the VCU; if the maximum temperature is less than the first preset temperature threshold, it sends the second command information to the VCU; Both the battery water circuit and the upper-mounted hydraulic cooling device include an oil-water heat exchanger; The VCU is used to, when detecting that the vehicle is in a non-working state, control the four-way valve to be in a disconnected state according to the first command information, so as to separate the battery water circuit and the motor cooling water circuit, and control the first three-way valve to bypass the oil-water heat exchanger; or when detecting that the vehicle is in a working state, control the four-way valve to switch to a connected state according to the second command information, so as to connect the battery water circuit and the motor cooling water circuit in series, and control the first three-way valve to open, so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit.

2. The heating device of the electric mixer truck according to claim 1, characterized in that, The battery water circuit further includes a first water pump, a second water temperature sensor, a first water temperature sensor, a plate heat exchanger, and a positive temperature coefficient PTC heater. The PTC heater, the first water pump, the second water temperature sensor, the battery pack, the first water temperature sensor, the plate heat exchanger, the four-way valve, and the oil-water heat exchanger are connected in sequence, and the PTC heater is connected to the oil-water heat exchanger; The motor cooling water circuit further includes a second water pump, a load, a second three-way valve, a radiator, and a second three-way joint. The second water pump, the load, the four-way valve, the second three-way valve, the radiator, and the second three-way joint are connected in sequence, and the second three-way joint is connected to the second water pump. Among them, the load includes an auxiliary control, a main drive controller, a main drive motor, an upper-mounted controller, and an upper-mounted motor; The upper-mounted hydraulic cooling device further includes an oil pump, a motor, a first three-way joint, and an oil radiator. The oil pump, the motor, the first three-way valve, the oil-water heat exchanger, the first three-way joint, and the oil radiator are connected in sequence, and the oil radiator is connected to the oil pump.

3. The heating device of the electric mixer truck according to claim 2, characterized in that, The motor cooling water circuit further includes a third water temperature sensor, which is respectively connected to the four-way valve and the load; The upper-mounted hydraulic cooling device further includes an oil temperature sensor, which is respectively connected to the first three-way valve and the motor.

4. The heating device of the electric mixer truck according to claim 3, characterized in that, The VCU is configured to, when detecting that the vehicle is in a driving state, control the four-way valve to switch to a connected state according to the heating request information in the second instruction information, so that the battery water circuit and the motor cooling water circuit are connected in series, and turn on the first water pump and the second water pump, and transfer the heat output by the load to the battery water circuit through the first water pump and the second water pump, and heat the battery pack.

5. The heating device of the electric mixer truck according to claim 4, characterized in that, The third water temperature sensor is configured to detect the first water temperature after the heat is output from the load; The VCU is configured to compare the first water temperature with a second preset temperature threshold, a third preset temperature threshold, and a fourth preset temperature threshold; If the first water temperature is less than the second preset temperature threshold, then control the second three-way valve to be in a bypass state to bypass the radiator, and control the PTC heater to heat the battery water circuit; If the first water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, then control the PTC heater to switch from the heating state to the off state; If the first water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in a connected state to allow the coolant to flow through the radiator for heat dissipation.

6. The heating device of the electric mixer truck according to claim 5, characterized in that, The VCU is configured to, when the lowest temperature of the battery reaches the second preset temperature threshold, control the four-way valve to switch to the disconnected state, so that the battery water circuit and the motor cooling water circuit are separated.

7. The heating device of the electric mixer truck according to claim 3, characterized in that, The VCU is configured to, when detecting that the upper-mounted mixing drum of the vehicle is in the working state, control the four-way valve to switch to a connected state according to the heating request information in the second instruction information, so that the battery water circuit and the motor cooling water circuit are connected in series, and turn on the first water pump and the second water pump, and transfer the heat output by the load to the battery water circuit through the first water pump and the second water pump, and heat the battery pack; and control the first three-way valve to open, so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit.

8. The heating device of the electric mixer truck according to claim 7, characterized in that, The second water temperature sensor is configured to detect the second water temperature entering the battery pack; The oil temperature sensor is configured to detect the temperature of the hydraulic oil; The VCU is configured to compare the second water temperature with the second preset temperature threshold. If the second water temperature is less than the second preset temperature threshold, then control the second three-way valve to be in a bypass state to bypass the radiator, and control the PTC heater to heat the battery water circuit; Compare the temperature of the hydraulic oil with the first preset temperature threshold. If the temperature of the hydraulic oil is less than the first preset temperature threshold, then control the first three-way valve to be in a bypass state to bypass the oil-water heat exchanger, and the hydraulic oil does not exchange heat with the coolant.

9. The heating device of the electric mixer truck according to claim 8, characterized in that, The VCU is configured to control the first three-way valve to be in a connected state when the lowest temperature of the battery reaches the second preset temperature threshold and the temperature of the hydraulic oil is less than the first preset temperature threshold, so that the hydraulic oil flows through the oil-water heat exchanger for heat exchange, thereby heating the hydraulic oil. When the highest temperature of the battery reaches the fifth preset temperature threshold, the temperature of the hydraulic oil reaches the second preset temperature threshold, or the second water temperature is greater than the fourth preset temperature threshold, control the four-way valve to be in a disconnected state to separate the battery water circuit and the motor cooling water circuit, and close the first three-way valve to bypass the oil-water heat exchanger, and turn off the PTC heater.

10. The heating device of the electric mixer truck according to claim 8, wherein the VCU is configured to compare the second water temperature with the second preset temperature threshold, the third preset temperature threshold, and the fourth preset temperature threshold respectively, and compare the temperature of the hydraulic oil with the third preset temperature threshold. If the second water temperature is greater than the second preset temperature threshold and less than the third preset temperature threshold, control the second three-way valve to be in a bypass state to bypass the radiator, and control the PTC heater to be turned off. If the temperature of the hydraulic oil is greater than the third preset temperature threshold, control the first three-way valve to open, so that the hydraulic oil in the upper-mounted hydraulic cooling device exchanges heat with the coolant in the battery water circuit. If the second water temperature is greater than the fourth preset temperature threshold, control the second three-way valve to be in a connected state to allow the coolant to flow through the radiator for heat dissipation, and control the first three-way valve to be in a bypass state to bypass the oil-water heat exchanger, so that the hydraulic oil does not exchange heat with the coolant.

11. An electric mixer truck, characterized in that, Comprising the heating device of the electric mixer truck according to any one of claims 1 to 10.

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