Pure electric vehicle and dual-power system thereof

Abstract

The utility model relates to a pure electric vehicle and a dual-power system thereof, and belongs to the technical field of new energy automobile power systems. The dual-power system comprises a first power battery, a first motor, a first motor controller, a second power battery, a second motor and a second motor controller, the first power battery is connected with the first motor through the first motor controller, and the second power battery is connected with the second motor through the second motor controller. The system further comprises a high-pressure steering motor and an air compressor, the first power battery is in power supply connection with the high-pressure steering motor, and the second power battery is in power supply connection with the air compressor. The vehicle comprises the dual-power system. The high-voltage power consumption of the two sets of power batteries can be balanced as much as possible, and the use range of the two sets of power batteries is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy vehicle power systems, and specifically relates to a pure electric vehicle and a dual power system thereof. Background Art

[0002] Pure electric vehicles with high power requirements are typically equipped with a dual power system, which consists of two sets of power batteries paired with two sets of motors and motor controllers, with the power batteries and motors working in unison. For example, off-highway dump trucks must operate in specific, non-powerful environments such as mining areas and construction sites. These environments often have poor road conditions, many slopes, and frequent turns, placing special demands on the vehicle's load capacity and maneuverability. Another example is heavy-duty trucks, which carry heavy loads for long or short distances and require long range and high power.

[0003] For pure electric vehicles equipped with dual power systems, both systems work simultaneously to provide driving power for the vehicle. This is especially true in harsh operating environments, such as those with potholes, numerous slopes, and numerous turns. The two power systems work in unison to ensure vehicle safety and reliability. In such conditions, if either power system loses its ability to drive, the vehicle will be unable to operate normally due to insufficient power. A key factor in a power system losing its ability to drive is a low power battery charge. This occurs because existing dual-power system vehicles do not consider the power distribution issues of the dual power systems, often resulting in one power battery being fully charged while the other is low on power. Utility Model Content

[0004] The purpose of the utility model is to provide a pure electric vehicle and a dual power system thereof, so as to solve the problem that the output power of the two power batteries of the existing dual power system vehicle is unbalanced, thereby affecting the normal operation of the vehicle.

[0005] The dual power system of a pure electric vehicle provided by the present utility model to solve the above-mentioned technical problems includes a first power battery, a first motor, a first motor controller, a second power battery, a second motor and a second motor controller. The first power battery is connected to the first motor through the first motor controller, and the second power battery is connected to the second motor through the second motor controller. The system also includes a high-voltage steering motor and an air compressor. The first power battery supplies power to the high-voltage steering motor, and the second power battery supplies power to the air compressor.

[0006] Furthermore, the system also includes a first DC / DC converter and a second DC / DC converter, the first power battery is connected to the input end of the first DC / DC converter, the second power battery is connected to the input end of the second DC / DC converter, and the output end of the first DC / DC converter and the output end of the second DC / DC converter are used to connect to the vehicle low-voltage load.

[0007] Furthermore, the system also includes a first PTC heating device and a second PTC heating device, wherein the first power battery is connected to the first PTC heating device for power supply, and the second power battery is connected to the second PTC heating device for power supply.

[0008] Furthermore, the system also includes a first water cooling unit and a second water cooling unit, the first power battery is connected to the first water cooling unit for power supply, and the second power battery is connected to the second water cooling unit for power supply.

[0009] Furthermore, the system also includes a third DC / DC converter and a fourth DC / DC converter, the first power battery is connected to the input end of the third DC / DC converter, the second power battery is connected to the input end of the fourth DC / DC converter, and the output end of the third DC / DC converter and the output end of the fourth DC / DC converter are used to connect to the vehicle monitoring host.

[0010] The beneficial effects of this utility model are as follows: This invention is an invention that changes the relationship between elements. In the prior art, except for the drive motor, other high-voltage electrical accessories are usually powered by a single power system. This will cause an imbalance in the high-voltage power consumption of the two power systems, resulting in premature depletion of the power system, and thus the inability to provide high power to the vehicle under adverse operating conditions, affecting the safe and stable operation of the vehicle. The utility model powers the high-voltage steering motor and air compressor separately from two power systems, balancing the high-voltage power consumption of the two power batteries and increasing the service life of the two power batteries.

[0011] The pure electric vehicle provided by the present invention to solve the above-mentioned technical problems includes a dual power system, which includes a first power battery, a first motor, a first motor controller, a second power battery, a second motor and a second motor controller. The first power battery is connected to the first motor through the first motor controller, and the second power battery is connected to the second motor through the second motor controller. The dual power system also includes a high-voltage steering motor and an air compressor. The first power battery supplies power to the high-voltage steering motor, and the second power battery supplies power to the air compressor.

[0012] Furthermore, the dual power system also includes a first DC / DC converter and a second DC / DC converter, the first power battery is connected to the input end of the first DC / DC converter, the second power battery is connected to the input end of the second DC / DC converter, and the output end of the first DC / DC converter and the output end of the second DC / DC converter are connected to the vehicle low-voltage load.

[0013] Furthermore, the dual power system further includes a first PTC heating device and a second PTC heating device, wherein the first power battery supplies power to the first PTC heating device, and the second power battery supplies power to the second PTC heating device.

[0014] Furthermore, the dual power system further includes a first water cooling unit and a second water cooling unit, the first power battery is connected to the first water cooling unit for power supply, and the second power battery is connected to the second water cooling unit for power supply.

[0015] Furthermore, the dual power system also includes a third DC / DC converter and a fourth DC / DC converter, the first power battery is connected to the input end of the third DC / DC converter, the second power battery is connected to the input end of the fourth DC / DC converter, and the output end of the third DC / DC converter and the output end of the fourth DC / DC converter are connected to the vehicle monitoring host.

[0016] The beneficial effects of this utility model are as follows: This invention is an invention that changes the relationship between elements. In the prior art, except for the drive motor, other high-voltage electrical accessories are usually powered by a single power system. This will cause an imbalance in the high-voltage power consumption of the two power systems, resulting in premature depletion of the power system, and thus the inability to provide high power to the vehicle under adverse operating conditions, affecting the safe and stable operation of the vehicle. The utility model powers the high-voltage steering motor and air compressor separately from two power systems, balancing the high-voltage power consumption of the two power batteries and increasing the service life of the two power batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an electrical block diagram of a dual power system according to an embodiment of the present utility model;

[0018] Figure 2 It is a network topology diagram of the dual power system of an embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0020] The basic idea of ​​the present invention is: in order to balance the high-voltage power consumption of the two power batteries in two independently operating power systems, the high-voltage electrical equipment on the vehicle is evenly divided into two parts according to power requirements, one part is used as the high-voltage electrical equipment of the first power battery, and the other part is used as the high-voltage electrical equipment of the second power battery.

[0021] A dual power system embodiment of a pure electric vehicle

[0022] Based on the above basic ideas, Figure 1 As shown, the dual power system of the present invention includes a first power battery, a first motor, a first motor controller, a second power battery, a second motor and a second motor controller. The first power battery is connected to the first motor through the first motor controller, and the second power battery is connected to the second motor through the second motor controller. The system also includes a high-voltage steering motor and an air compressor. The first power battery supplies power to the high-voltage steering motor, and the second power battery supplies power to the air compressor.

[0023] The high-voltage steering motor and air compressor are both high-voltage electrical equipment. After research and analysis, it was found that the power consumption of the two is similar during vehicle operation. In order to balance the high-voltage power consumption of the two sets of power batteries, the utility model incorporates the high-voltage steering motor into the first power system, and the power battery in the first power system supplies power to it. The air compressor is incorporated into the second power system, and the power battery in the second power system supplies power to it.

[0024] The first power battery is connected to the high-voltage steering motor, typically through a high-voltage steering motor controller, to provide power control for the high-voltage steering motor. To reduce wiring and space requirements, an integrated controller integrating motor control and high-voltage steering motor control functions is employed to implement these control functions. As a preferred embodiment, the first motor controller in this embodiment may be the aforementioned integrated controller, with the first power battery connected to the first motor and the high-voltage steering motor via the first motor controller.

[0025] When the second power battery is connected to the air compressor, it is typically powered through an air compressor controller to control the air compressor's power supply. To reduce wiring and space requirements, an integrated controller that integrates motor and air compressor control functions is used to implement these control functions. As a preferred embodiment, the second motor controller in this embodiment can be selected as this integrated controller, and the second power battery is powered through the second motor controller to connect to the second motor and air compressor.

[0026] There are many low-voltage electrical devices in the vehicle, such as the vehicle controller, transmission control unit, air-conditioning controller, instrument panel, turn signal, lighting, etc. Usually, the high voltage electricity in the power battery is converted into low voltage electricity to power various low-voltage electrical devices. In order to further balance the high-voltage power consumption of the two sets of power batteries, the present application sets up two DC / DC converters, namely the first DC / DC converter and the second DC / DC converter. The first power battery is connected to the input end of the first DC / DC converter, and the second power battery is connected to the input end of the second DC / DC converter. The output end of the first DC / DC converter and the output end of the second DC / DC converter are connected to the low-voltage load of the vehicle. In this way, each power battery supplies power to the low-voltage load through DC / DC, preventing the problem of unbalanced power consumption caused by only one power battery supplying power.

[0027] The vehicle is usually also equipped with a PTC heating device to heat the power battery and other components when the outside temperature is low so that they can operate at an appropriate temperature. In order to further balance the high-voltage power consumption of the two sets of power batteries, this application provides two PTC heating devices, namely the first PTC heating device and the second PTC heating device. The first power battery is connected to the first PTC heating device for power supply, and the second power battery is connected to the second PTC heating device for power supply.

[0028] When the ambient temperature is high, it is necessary to cool down the power batteries, motors, motor controllers and other equipment so that they can work at an appropriate temperature. Water cooling is usually used for cooling. When cooling by water cooling, a water cooling unit is provided in the water cooling system. The water cooling unit needs to be powered to operate normally. In order to further balance the high-voltage power consumption of the two sets of power batteries, this application sets up two water cooling units, namely the first water cooling unit and the second water cooling unit. The first power battery is powered by the first water cooling unit, and the second power battery is powered by the second water cooling unit.

[0029] When the vehicle is not in use and is in a parked state, the vehicle will be powered off at high voltage and low voltage. At this time, the original low-voltage power supply line will not be able to power the low-voltage electrical equipment of the vehicle. However, in order to monitor the status of the power battery in each battery system, the monitoring host needs to be powered and run. To this end, a DC / DC converter with a sleep and wake-up function is specially set up. The power battery is connected to the monitoring host through the DC / DC converter. When the power battery status needs to be detected or at a set interval, the DC / DC converter is woken up to power the monitoring host. The monitoring host obtains the detection results of the power battery and stores them. In order to further balance the high-voltage power consumption of the two sets of power batteries, the present application provides two DC / DC converters, namely the third DC / DC converter and the fourth DC / DC converter. The first power battery is connected to the input end of the third DC / DC converter, the second power battery is connected to the input end of the fourth DC / DC converter, and the output end of the third DC / DC converter and the output end of the fourth DC / DC converter are connected to the vehicle monitoring host.

[0030] Furthermore, after long-term operation, the vehicle's operating conditions can affect the different operating conditions of the vehicle's various electrical accessories, leading to significant differences in the SOC of the two battery systems. For example, on roads with many turns, the high-voltage steering motor will operate more frequently, resulting in greater power consumption by the first power battery. Alternatively, when charging the two power batteries, improper driver operation or limited charging facilities can result in differences in the charging power of the two power batteries, leading to significant differences in the SOC of the two power batteries. At this point, the instrument panel alerts the customer to the abnormal condition, and the vehicle controller executes the power allocation strategy. The purpose of the power allocation strategy is to ensure that the system with higher power consumption consumes more power and recovers less power, while the system with lower power consumption consumes less power and recovers more power. The allocation coefficients of the power allocation strategy in actual application are shown in Table 1.

[0031] Table 1 Power distribution coefficient

[0032]

[0033]

[0034] like Figure 1 As shown in the figure, the two power systems operate independently, perform fault diagnosis and alarm independently, and communicate with the vehicle controller through two independent CAN lines. The power battery, charging system, motor controller, motor, and water cooling unit in each power system use independent message IDs to interact with the vehicle controller, as shown in the figure. Figure 2 shown.

[0035] The charging and discharging power of the power batteries in the two power systems are independently controlled. The two power systems supply power to the corresponding motors respectively, and the motors can output torque independently.

[0036] Furthermore, each power system also includes a high-voltage distribution box and a battery control box. The power battery is connected to the motor controller, the battery control box and the charging interface through the high-voltage distribution box. Figure 1 shown.

[0037] The dual-power system of this embodiment is generally used in pure electric heavy-duty trucks, mining trucks, off-highway dump trucks, engineering vehicles (loaders) and some special vehicles (fire trucks, rescue vehicles).

[0038] A pure electric vehicle embodiment

[0039] The pure electric vehicle of the present invention includes a dual power system, wherein the dual power system adopts the dual power system of the above embodiment. The specific structure of the dual power system is shown in the above embodiment and will not be repeated here.

[0040] In order to prevent the SOC of the two power batteries from differing too much during charging, the vehicle of this embodiment uses software settings to restrict the two power systems to be charged at the same time. The charging guns of the first power system are numbered 1 and 2, and the two charging guns of the second power system are numbered 3 and 4. Charging balance is controlled by the program, that is, the combinations when charging with a single gun are: 1 and 3, 1 and 4, 2 and 3, 2 and 4. If each power system uses dual-gun charging, all four guns are charged simultaneously. During charging, if the program detects that only the charging gun corresponding to one power system is plugged in, while the other power system does not, or if both power systems have charging guns plugged in but the number of plugged charging guns is different, charging will be prohibited.

[0041] Furthermore, hardware settings are used to minimize the SOC difference caused by charging. Specifically, the layout position of the charging interface is set. For two charging interfaces arranged at the same position of the vehicle, one is used to charge the first power battery, and the other is used to charge the second rechargeable battery. The same position of the vehicle means: when there are two pairs of charging interfaces, one pair is located on the right side of the vehicle and the other pair is located on the left side of the vehicle, then the two charging interfaces located on the left side of the vehicle are located at the same position of the vehicle, and the two charging interfaces located on the right side of the vehicle are also located at the same position of the vehicle. Alternatively, a pair of charging interfaces is located in the middle of the left side of the vehicle, and a pair of charging interfaces is located at the front of the left side of the vehicle. Then the two charging interfaces located at the front are located at the same position of the vehicle, and the two charging interfaces located in the middle of the vehicle are also located at the same position of the vehicle.

[0042] Since the charging ports of the two power batteries are arranged in the same position, it is easier for the driver to think of inserting the charging gun into the two charging ports at the same time when charging, thereby reducing the problem of unbalanced charging of the two power batteries caused by driver negligence.

[0043] Furthermore, the vehicle is equipped with a vehicle instrument panel, an ICARD (intelligent vehicle terminal), and a background monitoring host. These devices can obtain the status data of the two power systems and display, analyze, store, and / or provide fault warnings. When displaying, analyzing, storing, and / or providing fault warnings, the status data of the two power systems needs to be distinguished.

[0044] Furthermore, the communication network between the various parts of the vehicle of the present invention is as follows Figure 2 As shown in the figure, vehicle components that need to communicate with the vehicle control unit (VCU) are divided into three categories: the body domain, the power domain, and the chassis domain. Components belonging to the body domain include the water-cooling unit, the gear selector panel, the electronic rearview mirror, the integrated central control, the air conditioning controller, the parking sensor, the 360-degree surround view system, the BCM (body control module), and the instrument cluster. These body domain components are connected to the main body CAN network and, through this network, to the CAN3 interface of the vehicle control unit. Components belonging to the power domain include the TCU (transmission control unit), the first BMS (battery management system), the first motor controller, the second motor controller, and the second BMS (battery management system). The TCU (transmission control unit), the first BMS (battery management system), and the first motor controller are connected to the VCU's CAN1 interface via the first high-voltage CAN network. The second motor controller and the second BMS (battery management system) are connected to the VCU's CAN2 interface via the second high-voltage CAN network. Components belonging to the chassis domain include the collision warning system, EPS (Electronic Power Steering), ABS (Anti-lock Braking System), and EBS (Electronic Stability Control). These components are connected via the chassis CAN network, the VCU's CAN4 interface. Thus, the two powertrains communicate with the vehicle controller via two separate CAN cables.

[0045] The dual power system of the present invention has the following characteristics: 1) It can balance the high-voltage power consumption of the two sets of power batteries as much as possible, thereby increasing the service range of the two sets of power batteries. 2) It ensures that the two sets of power batteries are charged at the same time as much as possible to prevent large deviations in the SOC of the two sets of power batteries, thereby increasing the service range of the two sets of batteries. 3) When one power system fails and cannot work normally while the other power system is normal, the entire vehicle still has certain driving, steering and cargo box lifting functions, thereby improving the ability to cope with sudden failures, increasing vehicle safety and maintenance convenience. 4) It can significantly increase the power of the power battery, greatly increasing the vehicle's operating time.

Claims

1. A dual power system for a pure electric vehicle, comprising a first power battery, a first motor, a first motor controller, a second power battery, a second motor, and a second motor controller, wherein the first power battery is connected to the first motor via the first motor controller, and the second power battery is connected to the second motor via the second motor controller, characterized in that: The system also includes a high-voltage steering motor and an air compressor. The first power battery supplies power to the high-voltage steering motor, and the second power battery supplies power to the air compressor.

2. The dual power system of a pure electric vehicle according to claim 1, characterized in that: The system also includes a first DC / DC converter and a second DC / DC converter, the first power battery is connected to the input end of the first DC / DC converter, the second power battery is connected to the input end of the second DC / DC converter, and the output end of the first DC / DC converter and the output end of the second DC / DC converter are used to connect to the vehicle low-voltage load.

3. The dual power system of a pure electric vehicle according to claim 1, characterized in that: The system also includes a first PTC heating device and a second PTC heating device. The first power battery supplies power to the first PTC heating device, and the second power battery supplies power to the second PTC heating device.

4. The dual power system of a pure electric vehicle according to claim 1, characterized in that: The system also includes a first water cooling unit and a second water cooling unit. The first power battery is connected to the first water cooling unit for power supply, and the second power battery is connected to the second water cooling unit for power supply.

5. The dual power system of a pure electric vehicle according to claim 1, characterized in that: The system also includes a third DC / DC converter and a fourth DC / DC converter. The first power battery is connected to the input end of the third DC / DC converter, the second power battery is connected to the input end of the fourth DC / DC converter, and the output end of the third DC / DC converter and the output end of the fourth DC / DC converter are used to connect to the vehicle monitoring host.

6. A pure electric vehicle comprising a dual power system, the dual power system comprising a first power battery, a first motor, a first motor controller, a second power battery, a second motor, and a second motor controller, wherein the first power battery is connected to the first motor via the first motor controller, and the second power battery is connected to the second motor via the second motor controller, characterized in that: The dual power system further includes a high-voltage steering motor and an air compressor. The first power battery supplies power to the high-voltage steering motor, and the second power battery supplies power to the air compressor.

7. The pure electric vehicle according to claim 6, characterized in that: The dual power system also includes a first DC / DC converter and a second DC / DC converter, the first power battery is connected to the input end of the first DC / DC converter, the second power battery is connected to the input end of the second DC / DC converter, and the output end of the first DC / DC converter and the output end of the second DC / DC converter are connected to the vehicle low-voltage load.

8. The pure electric vehicle according to claim 6, characterized in that: The dual power system further includes a first PTC heating device and a second PTC heating device, wherein the first power battery supplies power to the first PTC heating device, and the second power battery supplies power to the second PTC heating device.

9. The pure electric vehicle according to claim 6, characterized in that: The dual power system further includes a first water cooling unit and a second water cooling unit. The first power battery is connected to the first water cooling unit for power supply, and the second power battery is connected to the second water cooling unit for power supply.

10. The pure electric vehicle according to claim 6, characterized in that: The dual power system also includes a third DC / DC converter and a fourth DC / DC converter. The first power battery is connected to the input end of the third DC / DC converter, the second power battery is connected to the input end of the fourth DC / DC converter, and the output end of the third DC / DC converter and the output end of the fourth DC / DC converter are connected to the vehicle monitoring host.

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