A low-voltage power supply system and method for a commercial vehicle

Abstract

The present invention discloses a low-voltage power supply system and method for a commercial vehicle. When the vehicle is started, the power switch is closed, the power-off delay relay is connected, and the battery supplies power to the low-voltage electrical equipment; at the same time, the high voltage of the vehicle is powered on, and the DCDC module works to supply power to the low-voltage electrical equipment; the power-off delay relay is disconnected after a delay, and only the DCDC module supplies power to the low-voltage electrical equipment. The present invention adds a power-off delay relay, and the battery and the low-voltage power supply equipment of the vehicle and the DC DC can be cut off after the vehicle runs normally for a certain period of time, which reduces the number of charge and discharge cycles of the battery and improves the life of the battery.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology, and in particular relates to a low-voltage power supply system and method for a commercial vehicle. Background Art

[0002] In the existing low-voltage power distribution field of new energy commercial vehicles, the low-voltage power distribution system mainly includes batteries, power switches, distribution boxes, low-voltage electrical equipment, and high-voltage to low-voltage DC-DC. The battery provides a constant power supply for each low-voltage electrical equipment, and also provides the starting power for the whole vehicle. During the operation of the vehicle, the battery also supplies power to the electrical equipment. The power switch controls the power on and off, and the distribution box distributes the power. The DC-DC converts the high-voltage electricity provided by the new energy system into low-voltage electricity to power the whole vehicle and charge the battery.

[0003] The existing power distribution system has the following defects:

[0004] 1) During the operation of the vehicle, the battery is always connected to the low-voltage electrical equipment and DC of the whole vehicle, and the battery is always in a charging or discharging state, which has a certain impact on the life of the battery.

[0005] 2) The low-voltage power supply of the whole vehicle is provided by batteries and DC DC. At the same time, DC DC charges the battery. It is necessary to consider the low-voltage power consumption of the whole vehicle, DC DC output capacity, battery capacity matching, etc. The battery capacity requirements are relatively high, resulting in a low application range of some batteries. Summary of the invention

[0006] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a low-voltage power supply system and method for a commercial vehicle.

[0007] The technical solution adopted by the present invention is: a low-voltage power supply system for a commercial vehicle, comprising

[0008] The battery supplies power to low-voltage electrical equipment and normal electrical equipment when the power-off delay relay and the normally closed relay are closed;

[0009] The DCDC module is used to convert high voltage into low voltage during operation to supply power to low voltage electrical equipment and normal electrical equipment, as well as to charge the battery;

[0010] A power-off delay relay, one end of which is connected to a battery, the other end is connected to low-voltage electrical equipment and normal electrical equipment, and the control end is connected to a power switch;

[0011] Normally closed relay, one end is connected to the battery, the other end is connected to the normal power equipment, and the control end is connected to the vehicle control module;

[0012] The power switch is used to control the power-off delay relay to open or close;

[0013] The vehicle control module is used to control the normally closed relay to open or close and control the operation of the DCD module.

[0014] Furthermore, when the vehicle is started, the control power switch is closed, the power-off delay relay is turned on, the battery supplies power to the low-voltage electrical equipment, and the power-off delay relay is disconnected after a delay of a certain period of time.

[0015] Furthermore, when the vehicle is started, the high voltage of the whole vehicle is powered on, and the whole vehicle control module controls the DCDC module to work to supply power to the low-voltage electrical equipment.

[0016] Furthermore, after the vehicle is started and the high voltage is powered on, the vehicle control module controls the normally closed relay to disconnect and controls the DCDC module to work to supply power to the normal power equipment.

[0017] Furthermore, during the operation of the vehicle, when the remaining power of the battery is less than a preset power value, the battery is charged through the DCDC module.

[0018] Furthermore, when the vehicle is powered off, the vehicle control module controls the normally closed relay to close, and the battery supplies power to the normally powered equipment. When the remaining battery power is less than the power threshold, the normally closed relay is controlled to open.

[0019] A method for supplying power to a whole commercial vehicle at low voltage. When the vehicle is started, the power switch is closed, the power-off delay relay is turned on, and the battery supplies power to the low-voltage electrical equipment. At the same time, the whole vehicle is powered on at high voltage, and the DCDC module works to supply power to the low-voltage electrical equipment.

[0020] The power-off delay relay disconnects after a delay of a certain time, and only the DCDC module supplies power to the low-voltage electrical equipment.

[0021] Furthermore, when the DCDC module is working, the vehicle control module controls the normally closed relay to be disconnected, and the normally powered equipment is powered by the DCDC module.

[0022] Furthermore, during the operation of the vehicle, when the remaining power of the battery is less than a preset power value, the battery is charged through the DCDC module.

[0023] Furthermore, when the vehicle is powered off, the vehicle control module controls the normally closed relay to close, and the battery supplies power to the normally powered equipment. When the remaining battery power is less than the power threshold, the normally closed relay is controlled to open.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention optimizes the power supply strategy of the battery and adds a power-off delay relay. After the vehicle runs normally for a certain period of time, the battery and the vehicle's low-voltage power supply equipment and DC DC can be cut off, reducing the number of battery charge and discharge cycles and increasing the battery life.

[0026] 2. The battery of the present invention only provides electricity for various normal electrical equipment when the vehicle is parked. After the vehicle is operating normally, it is powered by DCDC. The battery capacity selection only needs to consider the static power consumption when the vehicle is stopped, which reduces the matching requirements of the battery for the vehicle. It not only reduces the capacity requirements of the battery, but also greatly improves the service life of the battery.

[0027] 3. The power supply principle of the power supply system of the present invention is simple, easy to implement, highly reliable and easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the low voltage power supply system of the present invention. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] like Figure 1 As shown, the present invention provides a low-voltage power supply system for a commercial vehicle, comprising

[0031] The battery supplies power to low-voltage electrical equipment and normal electrical equipment when the power-off delay relay and the normally closed relay are closed;

[0032] The DCDC module is used to convert high voltage into low voltage during operation to supply power to low voltage electrical equipment and normal electrical equipment, as well as to charge the battery;

[0033] A power-off delay relay, one end of which is connected to a battery, the other end is connected to low-voltage electrical equipment and normal electrical equipment, and the control end is connected to a power switch;

[0034] Normally closed relay, one end is connected to the battery, the other end is connected to the normal power equipment, and the control end is connected to the vehicle control module;

[0035] The power switch is used to control the power-off delay relay to open or close;

[0036] The vehicle control module is used to control the normally closed relay to open or close and control the operation of the DCD module.

[0037] In the above scheme, when the vehicle is started, the control power switch is closed, the power-off delay relay is turned on, the battery supplies power to the low-voltage electrical equipment, and the power-off delay relay is disconnected after a delay of a certain period of time.

[0038] In the above scheme, when the vehicle is started, the high voltage of the vehicle is powered on, and the vehicle control module controls the DCDC module to work to supply power to the low-voltage electrical equipment. After the vehicle is started, when the high voltage is powered on, the vehicle control module controls the normally closed relay to open, and controls the DCDC module to work to supply power to the normal electrical equipment.

[0039] In the above scheme, during the operation of the vehicle, when the remaining battery power is less than the preset value, the battery is charged through the DCDC module.

[0040] In the above scheme, when the vehicle is powered off, the vehicle control module controls the normally closed relay to close, and the battery supplies power to the normally powered equipment. When the remaining battery power is less than the power threshold, the normally closed relay is controlled to open.

[0041] Based on the above-mentioned commercial vehicle whole vehicle low-voltage power supply system, the present invention also provides a commercial vehicle whole vehicle low-voltage power supply method. When the vehicle is started, the power switch is closed, the power-off delay relay is turned on, and the battery supplies power to the low-voltage electrical equipment; at the same time, the high voltage of the whole vehicle is powered on, and the DCDC module works to supply power to the low-voltage electrical equipment; the power-off delay relay is disconnected after a delay time, and only the DCDC module supplies power to the low-voltage electrical equipment.

[0042] In the above scheme, when the DCDC module is working, the vehicle control module controls the normally closed relay to be disconnected, and the DCDC module is used to supply power to the normal power equipment. During the operation of the vehicle, when the remaining battery power is less than the preset power value, the battery is charged through the DCDC module.

[0043] In the above scheme, when the vehicle is powered off, the vehicle control module controls the normally closed relay to close, and the battery supplies power to the normally powered equipment. When the remaining battery power is less than the power threshold, the normally closed relay is controlled to open.

[0044] Example

[0045] The electrical system principle of the vehicle power supply system includes batteries, normal power supply parts, and controlled power supply parts.

[0046] The normal power supply part includes batteries, vehicle control modules, normally closed relays, normal power equipment, DC DC, wires and fuses. The normally closed relay can control the on and off of the normal power part of the battery. When the vehicle stops or is not powered on by high voltage, the battery provides low-voltage normal power to the vehicle. When the vehicle's high voltage and DC DC are working normally, the vehicle controller makes a judgment and controls the disconnection of the normally closed relay, thereby cutting off the battery and the normal power equipment. The normal power equipment of the vehicle is powered by DC DC, thereby reducing the power loss of the battery after the vehicle is powered on by high voltage.

[0047] The controlled power supply part includes batteries, power-off delay relays, power switches, vehicle control modules, DC DC, low-voltage electrical equipment and insurance. When the vehicle is powered on, the power-off delay relay is controlled to be turned on by the power switch. The power-off delay relay can set the disconnection delay time according to the actual situation of the vehicle, thereby providing the low-voltage power supply required by the vehicle. After the high voltage is powered on, the power-off delay relay is disconnected with a delay, and the DC DC supplies power to the low-voltage electrical equipment and the distribution box at the same time. When the battery is low on power, the DC DC can charge the battery, which can reduce the number of discharge and charge times of the battery after the vehicle is running or after the high voltage is powered on, and at the same time reduce the time of deep discharge of the battery, which can increase the battery life.

[0048] The above-mentioned power-off delay relay can be controlled by the vehicle control module. When the vehicle is running or the high voltage is powered on, the vehicle controller detects that the battery is low on power and can control the power-off delay relay to turn on, so that the battery is charged by DC DC. At the same time, the power switch can also actively control the relay to turn on.

[0049] The power switch adopts a self-reset switch, and the power-off delay time can be set. During the power-off delay time, the DC DC can charge the battery to make up for the battery self-discharge and static power consumption.

[0050] The present invention adds a normally closed relay and a power-off delay relay to control the battery power supply. After the vehicle is running, the low-voltage power supply is mainly provided by the high voltage through DC DC. The battery capacity selection only needs to consider the static power consumption of the vehicle when it is stopped, which reduces the matching requirements of the battery for the vehicle and reduces the battery capacity. Compared with the traditional electrical principle, the present invention not only reduces the capacity requirements of the battery, but also greatly improves the battery life.

[0051] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0052] In order to make the description of the present disclosure more detailed and complete, the above description is provided for the implementation and specific embodiments of the present invention; however, this is not the only form of implementing or using the specific embodiments of the present invention. The implementation covers the features of multiple specific embodiments and the method steps and sequences used to construct and operate these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.

[0053] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0054] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A commercial vehicle low-voltage power supply method based on a commercial vehicle low-voltage power supply system, characterized in that: The commercial vehicle low-voltage power supply system comprises The battery supplies power to low-voltage electrical equipment and normal electrical equipment when the power-off delay relay and the normally closed relay are closed; The DCDC module is used to convert high voltage into low voltage during operation to supply power to low voltage electrical equipment and normal electrical equipment, as well as to charge the battery; A power-off delay relay, one end of which is connected to a battery, the other end is connected to low-voltage electrical equipment and normal electrical equipment, and the control end is connected to a power switch; Normally closed relay, one end is connected to the battery, the other end is connected to the normal power equipment, and the control end is connected to the vehicle control module; The power switch is used to control the power-off delay relay to open or close; The vehicle control module is used to control the normally closed relay to open or close and control the operation of the DCDC module; When the vehicle is started, the power switch is closed, the power-off delay relay is turned on, and the battery supplies power to the low-voltage electrical equipment; at the same time, the high voltage of the vehicle is powered on, and the DCDC module works to supply power to the low-voltage electrical equipment; The power-off delay relay disconnects after a period of time, and only the DCDC module supplies power to the low-voltage electrical equipment.

2. The method for low-voltage power supply for a commercial vehicle according to claim 1, characterized in that: When the DCDC module is working, the vehicle control module controls the normally closed relay to disconnect and supplies power to the normal power equipment through the DCDC module.

3. The method for low-voltage power supply for a commercial vehicle according to claim 1, characterized in that: During vehicle operation, when the remaining battery power is less than the preset value, the battery is charged through the DCDC module.

4. The method for low-voltage power supply for a commercial vehicle according to claim 1, characterized in that: When the vehicle is powered off, the vehicle control module controls the normally closed relay to close, and the battery supplies power to the normally powered equipment. When the remaining battery power is less than the power threshold, the normally closed relay is controlled to open.

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