Vehicle power supply system and storage battery charging control method and device

Abstract

The invention belongs to the technical field of vehicle battery energy management, and particularly relates to a vehicle power supply system and a storage battery charging control method and device. The method comprises the steps that when it is detected that a vehicle mechanical handle switch is closed and a vehicle stands, if a power battery of the vehicle is in a starting state, the power battery is controlled to charge a storage battery through a DCDC converter, so that the storage battery can keep high voltage, the service life of the storage battery is prolonged, and the safety of the vehicle is improved. The frequency of starting the power battery especially when the storage battery is lack of electricity is reduced, the electricity supplementing control logic is simplified, the operation and maintenance cost is reduced, a mechanical switch does not need to be specially switched off, the storage battery is prevented from being lack of electricity when the vehicle stands for a long time while intelligent parts are used, use is more convenient, and the vehicle using experience of a user is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle battery energy management, and in particular relates to a vehicle power supply system, a battery charging control method and a device. Background Art

[0002] With the development of automobile electrification technology, the market for new energy vehicles such as buses, trucks and construction machinery vehicles is accelerating, and the scale of market application is gradually increasing. As the power supply for the low-voltage system of the vehicle, the low-voltage battery of the whole vehicle is one of the key components that affect driving safety. Under certain working conditions, when the power provided by the power battery cannot meet the power demand of the whole vehicle's electrical system, the low-voltage battery can supplement the power demand, while suppressing the voltage peak effect of the whole vehicle's electrical system, protecting electrical components that are sensitive to the voltage peak effect, and playing a role in voltage stabilization. In addition, the low-voltage battery is used as a vehicle starting battery to provide starting power for the vehicle to start, and can also provide low-voltage power for the vehicle's intelligent components (such as smart remote control key locks, smart door opening switches and smart door closing switches). Therefore, when the battery is depleted due to improper use by the driver, long-term parking of the vehicle, or modification of the vehicle, the vehicle cannot be started, affecting the driving experience of the driver and passengers.

[0003] In order to avoid the low-voltage battery running out of power due to long-term parking of the vehicle, one method is for the user to disconnect the vehicle's mechanical handle switch, so that the battery is disconnected from the vehicle's electrical system, that is, no electrical devices consume the low-voltage battery power. However, the driver is prone to forget to disconnect the mechanical handle switch, which is inconvenient to control, and the smart components cannot be used when the mechanical switch is disconnected. If the battery is left alone for too long, the battery self-discharge will also cause the battery power to gradually decrease. Another method is to wake up the vehicle controller and DCDC converter when the battery power is detected to be too low, and control the power battery to charge the battery through the DCDC converter. For example, a Chinese patent application document with publication number CN110315978A discloses a charging method for a low-voltage battery, which periodically detects whether the low-voltage battery is in a low-power state when the vehicle is in a stationary state. When the low-power state is reached, the low-voltage battery management system sends a charging request to the keyless controller, so that the keyless controller sends a remote start request to wake up the vehicle controller in a dormant state. The vehicle controller sends a request to the power battery management system to control the power battery to be powered on at high voltage, and sends a DCDC work request to the DCDC converter to charge the low-voltage battery. This method charges the battery only when it is low-power, which damages the battery's service life, and requires multiple controllers to send instructions to specifically start the power battery to charge the battery. The battery charging control process is relatively cumbersome, resulting in unnecessary cost waste and increased vehicle operation and maintenance costs. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle power supply system, a battery charging control method and a device to solve the problems of complex control logic and increased vehicle operation and maintenance costs in existing battery charging methods when the vehicle is parked for a long time.

[0005] In order to solve the above technical problems, the present invention provides a battery charging control method, which includes: when it is detected that the vehicle mechanical handle switch is closed and the vehicle is stationary, if the power battery of the vehicle is in a starting state, the power battery is controlled to charge the battery through a DCDC converter; wherein, when the power battery is in a charging or timed wake-up state, it means that the power battery is in a starting state; the power battery is in a timed wake-up state means that the power battery is in the moment when the monitoring unit regularly detects the health status of the power battery.

[0006] Furthermore, the DCDC converter is a converter shared by the power battery, the low-voltage device and the storage battery.

[0007] Furthermore, the method also includes: regularly detecting the voltage of the battery, and when it is detected that the vehicle mechanical handle switch is closed, the vehicle is stationary and the power battery is not in the started state, if the voltage of the battery is less than or equal to the charging threshold, waking up the DCDC converter and starting the power battery, controlling the power battery to charge the battery through the DCDC converter until the battery voltage reaches the set value, and stopping the power battery from charging the battery.

[0008] The beneficial effects of the above technical solution are: when it is detected that the vehicle's mechanical handle switch is closed and the vehicle is stationary, if the vehicle's power battery is in a started state, the power battery is controlled to charge the battery through the DCDC converter, so that the battery can maintain a higher voltage, thereby increasing the battery's service life, reducing the frequency of starting the power battery when the battery is low on power, simplifying the power replenishment control logic, reducing operation and maintenance costs, and there is no need to specifically disconnect the mechanical switch. It is possible to use smart components while avoiding battery low power when the vehicle is stationary for a long time, making it more convenient to use and improving the user's car experience.

[0009] In order to solve the above technical problems, the present invention further provides a battery charging control device, including a controller, wherein the controller is used to execute computer program instructions to implement the steps in the battery charging control method introduced above.

[0010] Furthermore, the controller is a vehicle controller.

[0011] The beneficial effects of the above technical solution are: when it is detected that the vehicle's mechanical handle switch is closed and the vehicle is stationary, if the vehicle's power battery is in a started state, the power battery is controlled to charge the battery through the DCDC converter, so that the battery can maintain a higher voltage, thereby increasing the battery's service life, reducing the frequency of starting the power battery when the battery is low on power, simplifying the power replenishment control logic, reducing operation and maintenance costs, and there is no need to specifically disconnect the mechanical switch. It is possible to use smart components while avoiding battery low power when the vehicle is stationary for a long time, making it more convenient to use and improving the user's car experience.

[0012] In order to solve the above technical problems, the present invention also provides a vehicle power supply system, including a power battery, a storage battery and a DCDC converter, the power battery charges the storage battery through the DCDC converter, and also includes a control unit, the control unit is used to detect the switch state of the vehicle mechanical handle, the working condition of the vehicle and the start-up state of the power battery, when it is detected that the vehicle mechanical handle switch is closed, the vehicle is stationary and the power battery of the vehicle is in the start-up state, the power battery is controlled to charge the storage battery through the DCDC converter; wherein, when the power battery is in the charging or timed wake-up state, it means that the power battery is in the start-up state; the power battery being in the timed wake-up state means that the power battery is in the moment when the monitoring unit regularly detects the health status of the power battery.

[0013] Furthermore, the DCDC converter is a converter shared by the power battery, the low-voltage device and the storage battery.

[0014] Furthermore, the control unit also periodically detects the voltage of the battery. When it is detected that the vehicle mechanical handle switch is closed, the vehicle is stationary and the power battery is not in the started state, if the voltage of the battery is less than or equal to the charging threshold, the controller wakes up the DCDC converter and starts the power battery, controls the power battery to charge the battery through the DCDC converter until the battery voltage reaches the set value, and stops the power battery from charging the battery.

[0015] Furthermore, the control unit is a vehicle controller.

[0016] The beneficial effects of the above technical solution are as follows: a control unit is provided in the power supply system, and when the control unit detects that the vehicle's mechanical handle switch is closed and the vehicle is stationary, if the vehicle's power battery is in a starting state, the power battery is controlled to charge the battery through the DCDC converter, so that the battery can maintain a higher voltage, thereby increasing the battery's service life, reducing the frequency of starting the power battery when the battery is low on power, simplifying the power replenishment control logic, reducing operation and maintenance costs, and eliminating the need to specifically disconnect the mechanical switch. It is possible to use smart components while avoiding battery low power when the vehicle is stationary for a long time, making it more convenient to use and improving the user's car experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a battery charging control flow chart of an embodiment of a vehicle power supply system of the present invention. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings.

[0019] The present invention aims at the problem of battery depletion when a vehicle is stationary for a long time. When it is detected that the vehicle mechanical handle switch is closed and the vehicle is stationary, if the power battery of the vehicle is in a starting state, the power battery is controlled to charge the battery through a DCDC converter, so that the battery can maintain a high voltage, thereby increasing the service life of the battery, reducing the frequency of starting the power battery when the battery is depleted, simplifying the power replenishment control logic, reducing operation and maintenance costs, and there is no need to specifically disconnect the mechanical switch. Intelligent components can be used while avoiding battery depletion when the vehicle is stationary for a long time, making it more convenient to use and improving the user's car experience.

[0020] Vehicle Power System Embodiment A vehicle power supply system of the present invention includes a power battery, a storage battery and a DCDC converter. The power battery charges the storage battery through the DCDC converter. The system also includes a control unit. The control unit is a controller, and the controller can be set separately. Preferably, in order not to increase the hardware cost and hardware detection signal, the controller can also be the vehicle controller VCU of the vehicle. The control unit is used to detect the switch state of the vehicle mechanical handle, the working condition of the vehicle and the starting state of the power battery, and implement a battery charging control method according to the detection data. The method includes active charging control and passive charging control, which can reduce costs while improving the vehicle operation reliability and the service life of the low-voltage battery. The specific process is as follows Figure 1 As shown, the following steps are included: 1. Detect the vehicle's mechanical handle switch status, the vehicle's operating conditions and the start-up status of the power battery, and regularly detect the battery voltage.

[0021] When the vehicle's mechanical handle switch is in the disconnected state, it means that the battery is disconnected from the vehicle's electrical system, that is, no electrical devices consume the low-voltage battery power, and the battery charging strategy is not executed at this time. When the vehicle is not stationary, it means that the vehicle is in operation, and the battery charging strategy is not executed at this time. When it is detected that the vehicle's mechanical handle switch is closed and the vehicle is stationary, it means that the battery is connected to the entire electrical system at this time, and it will supply power to the vehicle's low-voltage equipment. There will be a certain amount of power consumption. Even if the battery does not supply power to the vehicle's low-voltage equipment, the battery will also reduce its power due to long-term stationary, so it needs to be recharged, and enter the active or passive recharge judgment. The vehicle battery is a low-voltage battery, generally referring to 12V, 24V and 48V lead-acid batteries or lithium-ion batteries. New energy commercial vehicles mostly use 24V batteries, which mainly provide starting power for the vehicle.

[0022] 2. When the controller detects that the vehicle's mechanical handle switch is closed, the vehicle is stationary and the vehicle's power battery is in the starting state, it enters the passive charging state and controls the power battery to charge the battery through the DCDC converter.

[0023] When the power battery is in the charging or timed wake-up state, it means that the power battery is in the starting state; the power battery in the timed wake-up state means that the power battery is in the moment when the monitoring unit regularly detects the health status of the power battery. At this time, the low-voltage equipment that needs to work in the vehicle is powered by the power battery through the DCDC converter. Therefore, the started power battery can be used to charge the battery through the DCDC converter.

[0024] When the power battery is started, the low-voltage devices (such as VCU, power battery controller and monitoring host, etc.) in the corresponding high-voltage electrical control system of the vehicle are also in working state. The power battery provides power for these low-voltage devices, that is, the DCDC converter is in the starting state at this time, converting the high-voltage power supply of the power battery into the low-voltage power supply required by the low-voltage devices. The DCDC converter is a unidirectional step-down DCDC converter. Therefore, in order to further reduce costs, the DCDC converter is shared between the low-voltage devices and the battery, that is, the DCDC converter is a converter shared by the power battery, the low-voltage devices and the battery. When the power battery is in the charging or timed wake-up state, the power battery is controlled to charge the battery through the started DCDC converter, which further reduces costs and control processes, and can easily keep the battery at a high power level without adding additional hardware devices and control logic for power replenishment.

[0025] 3. When it is detected that the vehicle's mechanical handle switch is closed, the vehicle is stationary and the power battery is not in the started state, the vehicle's intelligent components and low-voltage equipment are powered by the battery. If the battery voltage is less than or equal to the charging threshold, it enters the active charging state, the VCU wakes up the DCDC converter, the power battery starts, and controls the power battery to charge the battery through the DCDC converter until the battery voltage reaches the set value, and stops the power battery from charging the battery.

[0026] If the controller detects that the vehicle's mechanical handle switch is closed, the vehicle is stationary and the power battery is not in the started state, but the battery voltage is higher than the charging threshold, it will not enter the active charging state and will not charge the battery.

[0027] Battery charging control method embodiment The battery charging control method of the present invention can be directly applied to the fields of new energy commercial vehicles and electric engineering machinery vehicles (devices), and can be expanded to all new energy vehicle fields. The method is the battery charging control method described in the above vehicle power system embodiment, and will not be described in detail here.

[0028] Embodiment of the battery charging control device A battery charging control device of the present invention includes a controller, which is used to execute computer program instructions to implement a battery charging control method. The specific implementation process of the method has been described in detail in the vehicle power system embodiment and will not be repeated here.

Claims

1. A battery charging control method, characterized in that: The method includes: when it is detected that the vehicle mechanical handle switch is closed and the vehicle is stationary, if the vehicle's power battery is in a startup state, controlling the power battery to charge the storage battery through a DCDC converter; wherein, when the power battery is in a charging or timed wake-up state, it indicates that the power battery is in a startup state; the power battery being in a timed wake-up state means that the power battery is in a moment when the monitoring unit regularly detects the health status of the power battery.

2. The battery charging control method according to claim 1, characterized in that: The DCDC converter is a converter shared by the power battery, low-voltage equipment and storage battery.

3. The battery charging control method according to claim 1 or 2, characterized in that: The method also includes: regularly detecting the voltage of the battery, and when it is detected that the vehicle mechanical handle switch is closed, the vehicle is stationary and the power battery is not in a started state, if the voltage of the battery is less than or equal to a charging threshold, waking up the DCDC converter and starting the power battery, controlling the power battery to charge the battery through the DCDC converter until the battery voltage reaches a set value, and stopping the power battery from charging the battery.

4. A battery charging control device, comprising a controller, characterized in that: The controller is used to execute computer program instructions to implement the steps in the battery charging control method as described in any one of claims 1 to 3.

5. The battery charging control device according to claim 4, characterized in that: The controller is a vehicle controller.

6. A vehicle power system, comprising a power battery, a storage battery and a DCDC converter, wherein the power battery charges the storage battery through the DCDC converter, characterized in that: It also includes a control unit, which is used to detect the switch state of the vehicle's mechanical handle, the working condition of the vehicle and the start-up state of the power battery. When it is detected that the vehicle's mechanical handle switch is closed, the vehicle is stationary and the power battery of the vehicle is in the start-up state, the power battery is controlled to charge the battery through the DCDC converter; wherein, when the power battery is in the charging or timed wake-up state, it means that the power battery is in the start-up state; the power battery being in the timed wake-up state means that the power battery is at the moment when the monitoring unit regularly detects the health status of the power battery.

7. The vehicle power supply system according to claim 6, characterized in that: The DCDC converter is a converter shared by the power battery, low-voltage equipment and storage battery.

8. The vehicle power supply system according to claim 6 or 7, characterized in that: The control unit also regularly detects the voltage of the battery. When it detects that the vehicle mechanical handle switch is closed, the vehicle is stationary and the power battery is not in the started state, if the battery voltage is less than or equal to the charging threshold, the controller wakes up the DCDC converter and starts the power battery, controls the power battery to charge the battery through the DCDC converter, until the battery voltage reaches the set value, and stops the power battery from charging the battery.

9. The vehicle power supply system according to claim 6, characterized in that: The control unit is a vehicle controller.

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