A new energy pure electric bus low voltage power distribution control system and device

Abstract

The present invention provides a new energy pure electric bus low-voltage power distribution control system and device, which can meet the needs of high-power low-voltage power distribution of pure electric buses, meet special needs such as high-voltage battery liquid cooling, dual-source oil pump, 24-hour high-voltage battery wake-up, etc., integrate common bus functions such as charging wake-up, dryer, condensing device, electric heat dissipation, optimize the power distribution structure layout, and realize the versatility of low-voltage power distribution units of pure electric buses.

Description

Technical Field

[0001] The present invention belongs to the technical field related to new energy pure electric buses, and in particular relates to a low-voltage power distribution control system and device for new energy pure electric buses. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, the technology of pure electric vehicles is developing rapidly. The promotion and use of pure electric buses has exceeded that of conventional fuel buses. With the advancement of vehicle technology, some new technologies of pure electric buses have become standard features of vehicles, such as high-voltage battery liquid cooling, dual-source oil pump, 24-hour high-voltage battery wake-up, etc. Correspondingly, the existing low-voltage power distribution PDCU distribution structure can no longer meet the realization of more functions, resulting in the need to plug in more functional distribution boxes, resulting in repeated waste of bus distribution functions, and the distribution status is chaotic. The versatility, maintainability, and practicality of the low-voltage PDCU have a lot of room for improvement. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a new energy pure electric bus low-voltage power distribution control system and device, which can meet the needs of high-power low-voltage power distribution of pure electric buses, meet special needs such as high-voltage battery liquid cooling, dual-source oil pump, 24-hour high-voltage battery wake-up, etc., integrate common bus functions such as charging wake-up, dryer, condensing device, electric heat dissipation, optimize the distribution structure layout, and realize the versatility of the low-voltage distribution unit of pure electric buses.

[0005] To achieve the above-mentioned purpose, one or more embodiments of the present invention provide the following technical solutions: A low-voltage power distribution control system for a new energy pure electric bus, characterized in that it comprises: a normal power distribution circuit, a motor heat dissipation relay, a battery liquid cooling water pump relay, an integrated power supply relay, an instrument power supply relay, a remote monitoring power supply relay and an electromagnetic main switch relay respectively connected in parallel with the normal power distribution circuit; a defrost power supply, an electric heat dissipation power supply and an oil pump enable relay connected in parallel with the electromagnetic main switch relay, and the opening and closing of the electromagnetic main switch control relay controls the on and off of the defrost power supply and the electric heat dissipation power supply;

[0006] A VCU ignition wake-up relay and a charging power supply circuit are electrically connected to the integrated power supply relay, the instrument power supply relay and the remote monitoring power supply relay; the charging power supply circuit controls the opening and closing of the integrated power supply relay, the instrument power supply relay and the remote monitoring power supply relay to provide power for the integrated power supply, the instrument power supply, the remote monitoring power supply and the VCU ignition wake-up.

[0007] A second aspect of the present invention provides a low-voltage power distribution control device for a new energy pure electric bus, comprising the above-mentioned low-voltage power distribution control system for a new energy pure electric bus, wherein the low-voltage power distribution control system is integrated on a circuit board.

[0008] One or more of the above technical solutions have the following beneficial effects:

[0009] The present invention integrates high-current power supplies such as DCDC, ATS, and dual-source oil pumps, thereby achieving the versatility and practicality of the power distribution system.

[0010] The present invention is provided with a hand-operated switch, which is convenient for operating and controlling the power supply of the whole vehicle, improves safety and reliability, and enhances maintainability.

[0011] The present invention meets special requirements such as high-voltage battery liquid cooling, dual-source oil pump, 24-hour high-voltage battery wake-up, charging wake-up, etc. It integrates unique functions such as reversing lights, dryers, condensing devices, and electric heat dissipation, reflecting compatibility and versatility.

[0012] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0014] Figure 1 This is a connection diagram of a low-voltage power distribution control system for a new energy pure electric bus in the first embodiment of the present invention;

[0015] Figure 2 It is a schematic diagram of a low-voltage power distribution control device for a new energy pure electric bus in the second embodiment of the present invention.

[0016] In the figure, 1. Main body, 2. Hand switch, 3. Terminal, 4. Relay, 5. Fuse, 6. Fixing hole DETAILED DESCRIPTION

[0017] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0018] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0019] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0020] Embodiment 1

[0021] like Figure 1 As shown, this embodiment discloses a low-voltage power distribution control system for a new energy pure electric bus, including: a normal power distribution circuit, a motor heat dissipation relay, a battery liquid cooling water pump relay, an integrated power supply relay, an instrument power supply relay, a remote monitoring power supply relay and an electromagnetic main switch relay respectively connected in parallel with the normal power distribution circuit; a defrost power supply, an electric heat dissipation power supply, and an oil pump enable relay connected in parallel with the electromagnetic main switch relay, and the opening and closing of the electromagnetic main switch control relay controls the on and off of the defrost power supply and the electric heat dissipation power supply;

[0022] A VCU ignition wake-up relay and a charging power supply circuit are electrically connected to the integrated power supply relay, the instrument power supply relay and the remote monitoring power supply relay; the charging power supply circuit controls the opening and closing of the integrated power supply relay, the instrument power supply relay and the remote monitoring power supply relay to provide power for the integrated power supply, the instrument power supply, the remote monitoring power supply and the VCU ignition wake-up.

[0023] In this embodiment, a battery electrically connected to the normal power distribution circuit is also included, a hand switch is provided on the normal power distribution circuit and the positive electrode connection loop of the battery, the normal power distribution circuit includes a DCDC, and the hand switch can control the DCDC to charge the battery. The DCDC can supply power to the entire vehicle.

[0024] It should be noted that the negative electrode of the battery is not directly connected to this system, but the negative electrode of the battery is connected to the ground wire of the entire vehicle, and the ground wire of this system and the ground wire of the entire vehicle are directly connected.

[0025] Specifically, the normal power distribution circuit also includes a dual-source oil pump, a distribution box, a front module, a module, an ATS power supply, a high-current normal power, a BMS normal power, a diagnostic normal power and a standby normal power.

[0026] Among them, the distribution box, front module and module provide normal power for the normal power parts of the whole vehicle.

[0027] Specifically, the normal power distribution circuit is connected to the first bus respectively, and the common contacts of the motor cooling fan relay, the common contacts of the motor cooling water pump relay, the common contacts of the battery liquid cooling water pump relay, and the common contacts of the electromagnetic main switch relay are electrically connected to the first bus through lines respectively.

[0028] The normally open contact of the electromagnetic main switch relay is connected to the second bus, and the common contact of the defrost relay, the common contact of the electric heat dissipation relay, and one coil end of the oil pump enabling relay are electrically connected to the second bus respectively.

[0029] In addition, the electromagnetic switch power supply, the heater power supply, the MCU power supply and the backup power supply are electrically connected to the second bus through lines respectively.

[0030] Among them, the electromagnetic switch power supply is the power supply after the electromagnetic switch, which is used to supply power to the front distribution box of the vehicle for secondary distribution of power. The heater power is also the power supply after the electromagnetic switch, which is used to supply power to the heater system (such as electric heating radiator) of the vehicle. The MCU power supply and backup power are the power supplies after the electromagnetic switch, which are used to supply power to the motor controller (MCU) of the vehicle and other required equipment on the vehicle.

[0031] The electromagnetic main switch relay is a high-current 200A relay. The electromagnetic main switch is used to control the electromagnetic circuit and can cut off all circuits behind the electromagnetic switch. The electromagnetic main switch is used to control the common electricity of the whole vehicle. The electromagnetic switch power supply distributes power to the main power supply, heating system, heating, etc. of the whole vehicle through a large fuse.

[0032] It can be understood that the big fuse is a fuse above 30A, which refers to the electromagnetic switch power supply and heater power.

[0033] The two ends of the coil of the motor cooling fan relay are respectively connected to the working power of the motor cooling fan, and the normally open contact is connected to the motor cooling fan power supply; the two ends of the coil of the motor cooling water pump relay are respectively connected to the working power of the motor cooling water pump, and the normally open contact is connected to the motor cooling water pump power supply; the two ends of the coil of the battery liquid cooling water pump relay are respectively connected to the working power of the motor cooling water pump, and the normally open contact is connected to the battery liquid cooling water pump power supply; the two ends of the coil of the defrost relay are respectively connected to the defrost enable control, and the normally closed contact is connected to the defrost power supply; the two ends of the coil of the electric heat dissipation relay are respectively connected to the electric heat dissipation enable control, and the normally closed contact is connected to the electric heat dissipation power supply; one end of the coil of the oil pump enable relay is connected to the common contact and connected to the second bus, and the other end of the coil of the oil pump enable relay is connected to the low-voltage oil pump enable control, and the normally open contact is connected to the oil pump power supply.

[0034] After the normally open contacts of the electromagnetic main switch relay are closed, the electric heat dissipation relay and the defrost relay are in the on state when there is no input to the control pin, and the defrost power supply and the electric heat dissipation power supply are powered by the normal power supply through the fuse 15A on the line connected to the defrost relay and the fuse 15A on the line connected to the electric heat dissipation relay respectively.

[0035] When the normally open contacts of the electromagnetic main switch relay are closed and the low-pressure oil pump enable control terminal is grounded, the oil pump enable relay is closed to turn on the oil pump power supply.

[0036] When the electromagnetic main switch relay is closed, the motor cooling fan power supply, the motor cooling fan water pump power supply, and the motor liquid cooling water pump power supply are still in a non-conducting state.

[0037] The working electricity of the motor cooling fan, the working electricity of the motor cooling water pump and the working electricity of the battery liquid cooling water pump respectively control the opening and closing of the motor cooling fan relay, the motor cooling water pump relay and the battery liquid cooling water pump relay. When the normally open contacts of the motor cooling fan relay, the motor cooling water pump relay and the battery liquid cooling water pump relay are closed, the normal electricity supplies power to the motor cooling fan power supply, the motor cooling water pump power supply and the battery liquid cooling water pump power supply.

[0038] The defrost enable control and electric heat sink enable control can prevent the defrost and electric heat sink from starting at the moment of high voltage, thus improving the safety of vehicle operation. The normally open contacts of the defrost relay and the normally open contacts of the electric heat sink relay are closed at the moment of high voltage, thereby making the defrost power supply and the electric heat sink power supply unpowered, so that the defrost and electric heat sink cannot be started.

[0039] In this embodiment, the normally closed contacts of the integrated power relay, the normally closed contacts of the instrument power relay, and the normally closed contacts of the remote monitoring relay are connected and then connected to the first bus; the normally open contacts of the integrated power relay and one end of the coil, the normally open contacts of the instrument power relay and one end of the coil, the normally open contacts of the remote monitoring relay and one end of the coil, and the normally open contacts of the VCU ignition relay and one end of the coil are respectively connected to the third bus, and the charging power supply, remote terminal charging wake-up, and instrument charging wake-up are also respectively connected to the third bus.

[0040] The common contact of the integrated power relay is connected to the integrated power supply, the common contact of the instrument power relay is connected to the instrument power supply, the common contact of the remote monitoring relay is connected in parallel with the VCU power supply and the remote terminal power supply, and the common contact of the VCU ignition relay is connected to the VCU ignition wake-up.

[0041] The charging power supply controlled by BMS provides power for the integrated power supply, instrument power supply, VCU power supply, remote terminal power supply, VCU ignition wake-up, instrument charging wake-up, and remote terminal charging wake-up, without consuming the battery power of the entire vehicle. The remote monitoring terminal receives message information from instruments, VCU, BMS and other devices, and records the status information during the charging process, thereby realizing effective monitoring and recording of the vehicle status.

[0042] When the VCU power supply is powered on, the motor cooling fan working power, motor cooling working power, and battery liquid cooling water pump working power are controlled by the VCU to start and stop the motor cooling fan, motor cooling water pump, and battery liquid cooling water pump of the whole vehicle, and effectively control the battery fluid. At the same time, the whole vehicle motor cooling fan, motor cooling water pump, and battery liquid cooling water pump control during driving are integrated to achieve universalization. The VCU controls the condenser exhaust and reversing lights, reflecting the characteristics of pure electric vehicles.

[0043] In this embodiment, the normally closed contact of the VCU ignition relay is connected to the normally open contact of the ignition relay through the fourth bus, one end of the ABS relay coil, the common contact of the reversing light relay, the common contact of the condenser exhaust relay and one end of the coil are respectively electrically connected to the fourth bus; the other end of the ABS relay coil is connected to the ABS working signal, the normally open contact of the ABS relay is externally connected to a separate ground wire, the common contact of the ABS relay is electrically connected to the ABS working signal negative control, the normally open contact of the reversing light relay is electrically connected to the reversing light power supply; both ends of the coil of the reversing light relay are electrically connected to the reversing light control end; the normally open contact of the condenser exhaust relay is electrically connected to the condenser exhaust power supply, and the other end of the condenser exhaust relay coil is electrically connected to the vehicle exhaust enable.

[0044] The ignition switch controls the opening and closing of the ignition relay. After the normally open contacts of the ignition relay and the normally open contacts of the electromagnetic main switch relay are closed, the ignition rear power supply (i.e. the electromagnetic main switch rear power supply) supplies power to the condensing exhaust power supply and VCU ignition wake-up.

[0045] In addition, the ignition standby, dryer, MCU ignition, integrated power ignition, BMS ignition and smoke alarm ignition are electrically connected to the fourth bus respectively.

[0046] In this embodiment, the above-mentioned power distribution circuits are all provided with corresponding fuses to protect the circuits.

[0047] The above power distribution functions are integrated into the power PDCU to form a whole, realizing the basic low-voltage power distribution and control functions of pure electric buses, and realizing the unique characteristics of pure electric buses.

[0048] Pure electric bus low-voltage PDCU: A high-power control box that can realize high-current power distribution control of the low-voltage system of pure electric buses, meet special needs such as high-voltage battery liquid cooling, dual-source oil pump, 24-hour wake-up, and integrate charging wake-up, dryer, condensing device, electric heat dissipation and other functions.

[0049] When the hand switch is turned on, only the normal power distribution circuit is powered. Only after the main electromagnetic switch is turned on can the electromagnetic switch power, heater power, MCU power, backup power, ignition power, etc. be provided to the entire vehicle, thereby achieving effective step-by-step control of the vehicle's electricity consumption, avoiding safety hazards in the vehicle's electricity consumption, and effectively saving the vehicle's electricity consumption.

[0050] Embodiment 2

[0051] like Figure 2As shown, the purpose of this embodiment is to provide a low-voltage power distribution control device for a new energy pure electric bus, including the above-mentioned low-voltage power distribution control system for a new energy pure electric bus. The low-voltage power distribution control system is integrated on a double-layer circuit board and is reasonably arranged and laid out according to the functions. The outer box body of the circuit board is made of flame-retardant engineering plastics, which not only meets the safety of bus electricity use, but also has a more integrated and integrated design, so that the integrated box body is stable and firm, and will not loosen due to vehicle vibration, thereby increasing the service life.

[0052] The power distribution control device includes a main body 1 and a hand-operated switch 2 arranged on one side of the main body 1. The main body 1 and the hand-operated switch 2 are connected and fixed by bolts. The connection and fixation are reliable. According to the layout of the whole vehicle, a small maintenance door can be installed at the location where the hand-operated switch 2 is arranged. The small maintenance door is used to facilitate the driver to turn on and off the main power of the whole vehicle, thereby improving operability.

[0053] Four bolt fixing holes 6 are respectively arranged around the main body 1, and the fixing bolts can be fixed to the vehicle fixing plate through the holes, so as to facilitate installation and maintenance.

[0054] The terminal 3 is arranged below the main body 1 and is used for crimping the high-current cables of the whole vehicle. The main body 1 has a reserved wire plug at the bottom. The vehicle wiring can be connected to the terminal in the PDCU through the wire hole of the main body 1, and then protected by a flexible sealing rubber to prevent dust from entering.

[0055] Relay 4 is distributed inside the PDCU to control the on and off of the circuit and realize the control of power distribution. The relay is selected according to the power used to maximize the use of space; the relay and the fuse are arranged reasonably to ensure that the box body is small and beautiful. The box body is fixed by bolts, which is easy to disassemble and maintain, and achieves the best composite reliability.

[0056] Fuse 5 is distributed inside the PDCU controller to control the protection of the circuit and reserve a design margin to protect the line.

[0057] The fixing holes 6 are distributed around the PDCU controller, with a total of four fixing points for fixing the PDCU.

[0058] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A new energy pure electric bus low voltage power distribution control system, characterized in that: include: A normal power distribution circuit, a motor heat dissipation relay, a battery liquid cooling water pump relay, an integrated power supply relay, an instrument power supply relay, a remote monitoring power supply relay and an electromagnetic main switch relay connected in parallel with the normal power distribution circuit; a defrost power supply, an electric heat dissipation power supply and an oil pump enable relay connected in parallel with the electromagnetic main switch relay, and the opening and closing of the electromagnetic main switch control relay controls the on and off of the defrost power supply and the electric heat dissipation power supply; A VCU ignition wake-up relay and a charging power supply circuit electrically connected to the integrated power supply relay, the instrument power supply relay, and the remote monitoring power supply relay; the charging power supply circuit controls the opening and closing of the integrated power supply relay, the instrument power supply relay, and the remote monitoring power supply relay to supply power to the integrated power supply, the instrument power supply, the remote monitoring power supply, and the VCU ignition wake-up; The normally closed contacts of the integrated power supply relay, the instrument power supply relay and the remote monitoring power supply relay are electrically connected to the normal power distribution circuit, and the normal power distribution circuit supplies power to the integrated circuit, the instrument power supply and the remote terminal power supply; The charging power supply is electrically connected to the coil terminal and the normally open contact of the integrated power supply relay, the coil terminal and the normally open contact of the instrument power supply relay, the coil terminal and the normally open contact of the remote monitoring power supply relay, and the coil terminal and the normally open contact of the VCU ignition relay, respectively, and the charging power supply is used to supply power to the integrated power supply, the instrument power supply, the remote terminal power supply, and the VCU ignition wake-up; It also includes a battery electrically connected to the normal power distribution circuit, a manual switch is provided on the connection loop between the normal power distribution circuit and the battery, the normal power distribution circuit includes a DCDC, and the DCDC can be controlled by the manual switch to charge the battery; an MCU power supply, a backup power supply, a heater power supply and an ignition relay electrically connected to the normally open contacts of the electromagnetic main switch relay respectively; After the normally open contact of the electromagnetic main switch relay is closed, the electric heat dissipation relay and the defrost relay are in the state of no input to the control pin, the defrost power supply and the electric heat dissipation power supply are in the on state, and the normal power supply respectively supplies power to the defrost power supply and the electric heat dissipation power supply through the fuse 15A on the line connected to the defrost relay and the fuse 15A on the line connected to the electric heat dissipation relay; After the normally open contact of the electromagnetic main switch relay is closed and the low-pressure oil pump enable control terminal is grounded, the oil pump enable relay is closed to turn on the oil pump power supply; When the electromagnetic main switch relay is closed, the motor cooling fan power supply, motor cooling fan water pump power supply, and motor liquid cooling water pump power supply are still in a non-conductive state; When the normally open contacts of the motor cooling fan relay, the motor cooling water pump relay, and the battery liquid cooling water pump relay are closed, the motor cooling fan power supply, the motor cooling water pump power supply, and the battery liquid cooling water pump power supply are supplied by the normal power distribution circuit.

2. A new energy pure electric bus low voltage power distribution control system as claimed in claim 1, characterized in that: The ABS relay, reversing light relay, condenser exhaust relay and VCU ignition relay electrically connected to the ignition relay control the opening and closing of the ignition relay and the opening and closing of the electromagnetic main switch relay to control the normal power to supply power to the ABS working signal, reversing light power supply, condenser exhaust power supply and VCU ignition wake-up.

3. A new energy pure electric bus low voltage power distribution control system as claimed in claim 1, characterized in that: The opening and closing of the ignition relay also controls the opening and closing of the ignition standby, dryer, MCU ignition, integrated power supply ignition, BMS ignition and smoke alarm ignition.

4. A new energy pure electric bus low voltage power distribution control system as claimed in claim 1, characterized in that: The meter charging wake-up and the remote terminal charging wake-up are electrically connected to the charging power supply respectively, and the charging power supply supplies power for the meter charging wake-up and the remote terminal charging wake-up.

5. A new energy pure electric bus low voltage power distribution control system as claimed in claim 1, characterized in that: All connecting lines are equipped with corresponding fuses.

6. A new energy pure electric bus low voltage power distribution control system as claimed in claim 1, characterized in that: The defrost enable control and the electric heat dissipation enable control respectively control the opening and closing of the defrost relay and the electric heat dissipation relay when the high voltage is on, and then control the opening of the defrost power supply and the electric heat dissipation power supply.

7. A low-voltage power distribution control device for a new energy pure electric bus, comprising a low-voltage power distribution control system for a new energy pure electric bus as described in any one of claims 1 to 6, wherein the low-voltage power distribution control system is integrated on a circuit board.

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