阅读说明：本技术 一种纯电动车上下电控制系统的控制方法 (Control method of power-on and power-off control system of pure electric vehicle ) 是由 肖聪 程林 汪斌 卞晓光 王金员 石秀柱 徐远 於家华 苏磊 肖俊 宋小伟 于 2021-08-17 设计创作，主要内容包括：一种纯电动车上下电控制系统的控制方法,该方法通过在整车控制器VCU、上装控制器U2和高压配电控制器HCM进行信息交互后才闭合预充继电器KA2和主回路继电器KA3,开始上装预充,以及在整车控制器VCU、上装控制器U2和高压配电控制器HCM再次进行信息交互后才闭合上装供电继电器KA4,增强了上装与底盘之间的信息交互,从而提高了车辆上电的系统性和安全性,该方法还通过检测到接收到的来自电池管理系统控制器BMS的最大允许电流大于上装额定需求电流时闭合工作继电器KA5,保证上装正常工作的同时避免用电过大导致动力电池损坏。(A control method of a power-on and power-off control system of a pure electric vehicle is characterized in that a pre-charging relay KA2 and a main loop relay KA3 are closed after information interaction is carried out on a vehicle control unit VCU, an upper loading controller U2 and a high-voltage distribution controller HCM, loading pre-charging is started, and a power supply relay KA4 is closed after information interaction is carried out on the vehicle control unit VCU, the upper loading controller U2 and the high-voltage distribution controller HCM again, so that the information interaction between the upper loading and a chassis is enhanced, the systematicness and the safety of vehicle power-on are improved, and the working relay KA5 is closed when the maximum allowable current received from a battery management system controller BMS is detected to be larger than the rated current required by the upper loading, so that the normal work of the upper loading is guaranteed, and the damage of a power battery caused by overlarge electricity is avoided.)

1. A control method of a power-on and power-off control system of a pure electric vehicle is characterized by comprising the following steps:

the control system comprises a power battery (1), a battery management system controller BMS, a high-voltage distribution controller HCM, a storage battery (2), a vehicle control unit VCU, a frequency converter U1, an upper controller U2 and an upper alternating current motor M, wherein the vehicle control unit VCU, the high-voltage distribution controller HCM, the battery management system controller BMS and the upper controller U2 are in signal connection through CAN lines;

the positive electrode of the power battery (1) is connected with one end of a pre-charging relay KA2 and one end of a main loop relay KA3, the other end of the pre-charging relay KA2 is connected with one end of a resistor R1, the other end of the resistor R1 and the other end of the main loop relay KA3 are connected with the positive electrode IN + of the direct-current input end of a frequency converter U1 through a relay KA4.1 IN an upper power supply relay KA4, the negative electrode of the power battery (1) is connected with the negative electrode IN-of the direct-current input end of a frequency converter U1 through a relay KA4.2 IN an upper power supply relay KA4, the output end of the frequency converter U1 is connected with one end of an upper alternating-current motor M, the GND end of the frequency converter U1 and the other end of the upper alternating-current motor M are grounded, and a working relay 5 for controlling the frequency converter U1 to start and stop is arranged on the frequency converter U1;

the positive pole of the storage battery (2) is simultaneously connected with a positive pole interface 12V of a battery management system controller BMS, a positive pole interface 12V of a high-voltage distribution controller HCM, a positive pole interface 12V of a vehicle control unit VCU, an enabling interface EN of an upper controller U2, one end of an upper starting switch SKQ and one end of an upper power supply switch SGD, the GND end of the upper controller U2 is grounded, the other end of the upper starting switch SKQ is connected with a storage battery power supply interface + XLV of the upper controller U2, the other end of the upper power supply switch SGD is connected with a pin V of a VCU of the vehicle controller, the negative electrode of the storage battery (2) is grounded and then is simultaneously connected with a negative electrode interface 12V of a high-voltage distribution controller HCM, a negative electrode interface 12V of a battery management system controller BMS and a negative electrode interface 12V of a vehicle control unit VCU;

the pre-charging relay KA2 and the main loop relay KA3 are electrically connected with a high-voltage distribution controller HCM, and the upper power supply relay KA4 and the working relay KA5 are electrically connected with an upper controller U2;

the control method comprises power-on control, and the power-on control sequentially comprises the following steps:

s1, after the storage battery (2) supplies power to the power-on and power-off control system at low voltage, the vehicle control unit VCU closes the power supply switch SGD, then sending an uploading permission working signal to an uploading controller U2, sending an uploading power supply request to a vehicle control unit VCU after the uploading permission working signal is received by the uploading controller U2, the VCU of the vehicle controller sends a closing command of the loading power supply relay to the high voltage distribution controller HCM after receiving the loading power supply request signal, the high-voltage distribution controller HCM closes the pre-charging relay KA2 after receiving the closing command of the upper power supply relay, then, whether the reduction amplitude of the pressure difference between the front end and the rear end of the main circuit relay KA3 before and after the pre-charging relay KA2 is closed does not exceed a design value or not is judged, if yes, closing a main loop relay KA3 by the high-voltage distribution controller HCM to start pre-charging, if not, stopping charging and reporting a fault;

s2, after the pre-charging is completed, the high-voltage distribution controller HCM firstly disconnects a pre-charging relay KA2 and then sends a closing signal of an upper charging power supply relay to a vehicle control unit VCU, the vehicle control unit VCU receives the closing signal of the upper charging power supply relay and then sends a closing command of an upper charging loop relay to the upper charging controller U2, the upper charging controller U2 firstly closes a first relay KA4.1 and a second relay KA4.2 after receiving the closing command of the upper charging loop relay, at the moment, the power battery (1) starts to supply power for the high voltage of the frequency converter U1, and then closes an upper charging starting switch SKQ;

and S3, when the upper controller U2 detects that the maximum allowable current received from the battery management system controller BMS is larger than the rated upper requirement current, closing the working relay KA5, starting the frequency converter U1, converting the high-voltage direct current into alternating current by the frequency converter U1 to supply power to the upper alternating current motor M, and starting the upper alternating current motor M to work.

2. The control method of the pure electric vehicle power-on and power-off control system according to claim 1, characterized in that:

the control method further comprises a power-off control, which comprises the following steps in sequence:

a1, when the upper controller U2 detects that an upper starting switch SKQ is disconnected or the maximum allowable current received from a battery management system controller BMS is not larger than the upper rated demand current, a working relay KA5 is controlled to be disconnected, and the frequency converter U1 stops working;

a2, the loading controller U2 sends a loading loop relay disconnection request signal to a vehicle control unit VCU after waiting for T1 seconds, the vehicle control unit VCU firstly disconnects a loading power supply switch SGD after receiving the loading loop relay disconnection request signal, then sends a loading loop relay disconnection command to the loading controller U2, and the loading controller U2 disconnects a first relay KA4.1 and a second relay KA4.2 after receiving the loading loop relay disconnection command and sends a loading power-off request signal to the vehicle control unit VCU;

a3, after receiving an on-load power-off request signal, the VCU sends an on-load power supply relay disconnection command to the high-voltage distribution controller HCM, and after receiving the on-load power supply relay disconnection command, the high-voltage distribution controller HCM disconnects the main loop relay KA3, and at the moment, the power battery (1) stops supplying power to the U1 at high voltage.

3. The control method of the pure electric vehicle power-on and power-off control system according to claim 1 or 2, characterized in that:

in the step S1, the voltage difference between the front end and the rear end of the main loop relay KA3 is detected by a first voltmeter V1 and a second voltmeter V2, the first voltmeter V1 and the second voltmeter V2 are both electrically connected with the high-voltage distribution controller HCM, one end of the first voltmeter V1 is connected with a loop between the positive electrode of the power battery (1) and one end of the precharge relay KA2, and one end of the main loop relay KA3, the other end of the first voltmeter V1 is connected with a loop between the negative electrode of the power battery (1) and one end of the second relay KA4.2, one end of the second voltmeter V2 is connected with a loop between the other end of the main loop relay KA3 and one end of the first relay KA4.1, and the other end of the second voltmeter V2 is connected with a loop between the other end of the first voltmeter V1 and one end of the second relay KA 4.2.

4. The control method of the pure electric vehicle power-on and power-off control system according to claim 1 or 2, characterized in that:

the resistor R1 and the main loop relay KA3 are connected with the first relay KA4.1 through the first safety switch FU 2.

5. The control method of the pure electric vehicle power-on and power-off control system according to claim 1 or 2, characterized in that:

the positive electrode of the storage battery (2) is simultaneously connected with a positive electrode interface of a battery management system controller BMS, a positive electrode interface of a high-voltage distribution controller HCM, a positive electrode interface of a vehicle control unit VCU, an enabling interface EN of an upper controller U2, one end of an upper starting switch SKQ and one end of an upper power supply switch SGD through a second safety switch FU 3.

6. The control method of the pure electric vehicle power-on and power-off control system according to claim 5, characterized in that:

the second safety switch FU3 is connected with the upper power supply switch SGD through the third safety switch FU 4.

7. The control method of the pure electric vehicle power-on and power-off control system according to claim 5, characterized in that:

the second safety switch FU3 is connected with the enable interface EN of the upper controller U2 through a fourth safety switch FU 11.

8. The control method of the pure electric vehicle power-on and power-off control system according to claim 1 or 2, characterized in that:

the upper-mounted starting switch SKQ is connected with a storage battery power supply interface + XLV of the upper-mounted controller U2 through a five-way safety switch FU 12.

Technical Field

The invention belongs to the technical field of pure electric vehicle power supply, and particularly relates to a control method of a power-on and power-off control system of a pure electric vehicle.

Background

The upper mounting is a general term of equipment for power output of operation of a pure electric special vehicle, and an upper mounting system and a chassis system in the prior art generally work independently, lack of information interaction, have no strict power-on and power-off process and have poor systematicness. If the upper mounting system fails and the whole vehicle chassis still powers on the upper mounting system, a high-voltage contactor of the upper mounting system is easily damaged, and if the whole vehicle chassis fails and the upper mounting system still works, the upper mounting system is easily damaged, and the safety of the vehicle is reduced.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a control method of a pure electric vehicle power-on and power-off control system with higher safety.

In order to achieve the above purpose, the invention provides the following technical scheme:

a control method of a pure electric vehicle power-on and power-off control system comprises a power battery, a battery management system controller BMS, a high-voltage power distribution controller HCM, a storage battery, a vehicle control unit VCU, a frequency converter U1, an upper controller U2 and an upper alternating current motor M, wherein the vehicle control unit VCU, the high-voltage power distribution controller HCM, the battery management system controller BMS and the upper controller U2 are in signal connection through CAN lines;

the positive electrode of the power battery is connected with one end of a pre-charging relay KA2 and one end of a main loop relay KA3, the other end of the pre-charging relay KA2 is connected with one end of a resistor R1, the other end of the resistor R1 and the other end of the main loop relay KA3 are connected with the positive electrode IN + of the direct current input end of a frequency converter U1 through a relay KA4.1 IN an upper power supply relay KA4, the negative electrode of the power battery is connected with the negative electrode IN-of the direct current input end of a frequency converter U1 through a relay KA4.2 IN an upper power supply relay KA4, the output end of the frequency converter U1 is connected with one end of an upper alternating current motor M, the GND end of the frequency converter U1 and the other end of the upper alternating current motor M are grounded, and a working relay KA5 for controlling the on and off of the frequency converter U1 is arranged on the frequency converter U1;

the positive electrode of the storage battery is simultaneously connected with a positive electrode interface 12V of a battery management system controller BMS, a positive electrode interface 12V of a high-voltage power distribution controller HCM, a positive electrode interface 12V of a vehicle control unit VCU, an enable interface EN of an upper controller U2, one end of an upper starting switch SKQ and one end of an upper power supply switch SGD, the GND end of the upper controller U2 is grounded, the other end of the upper starting switch SKQ is connected with a storage battery power supply interface + XLV of an upper controller U2, the other end of the upper power supply switch SGD is connected with a pin V of the vehicle control unit VCU, and the negative electrode of the storage battery is grounded and then simultaneously connected with a negative electrode interface 12V-of the high-voltage power distribution controller HCM, a negative electrode interface 12V-of the battery management system controller BMS and a negative electrode interface 12V-of the vehicle control unit VCU;

the pre-charging relay KA2 and the main loop relay KA3 are electrically connected with the high-voltage distribution controller HCM, and the upper power supply relay KA4 and the working relay KA5 are electrically connected with the upper controller U2.

The control method comprises power-on control, and the power-on control sequentially comprises the following steps:

s1, after the storage battery supplies power to the power-on and power-off control system at low voltage, the vehicle control unit VCU closes the power supply switch SGD, then sending an uploading permission working signal to an uploading controller U2, sending an uploading power supply request to a vehicle control unit VCU after the uploading permission working signal is received by the uploading controller U2, the VCU of the vehicle controller sends a closing command of the loading power supply relay to the high voltage distribution controller HCM after receiving the loading power supply request signal, the high-voltage distribution controller HCM closes the pre-charging relay KA2 after receiving the closing command of the upper power supply relay, then, whether the reduction amplitude of the pressure difference between the front end and the rear end of the main circuit relay KA3 before and after the pre-charging relay KA2 is closed does not exceed a design value or not is judged, if yes, closing a main loop relay KA3 by the high-voltage distribution controller HCM to start pre-charging, if not, stopping charging and reporting a fault;

s2, after the pre-charging is completed, the high-voltage distribution controller HCM firstly disconnects a pre-charging relay KA2 and then sends a closing signal of an upper charging power supply relay to a vehicle control unit VCU, the vehicle control unit VCU sends a closing command of the upper charging loop relay to an upper charging controller U2 after receiving the closing signal of the upper charging power supply relay, the upper charging controller U2 firstly closes a first relay KA4.1 and a second relay KA4.2 after receiving the closing command of the upper charging loop relay, at the moment, the power battery starts to supply power for the high voltage of the frequency converter U1, and then closes an upper charging starting switch SKQ;

and S3, when the upper controller U2 detects that the maximum allowable current received from the battery management system controller BMS is larger than the rated upper requirement current, closing the working relay KA5, starting the frequency converter U1, converting the high-voltage direct current into alternating current by the frequency converter U1 to supply power to the upper alternating current motor M, and starting the upper alternating current motor M to work.

The control method further comprises a power-off control, which comprises the following steps in sequence:

a1, when the upper controller U2 detects that an upper starting switch SKQ is disconnected or the maximum allowable current received from a battery management system controller BMS is not larger than the upper rated demand current, a working relay KA5 is controlled to be disconnected, and the frequency converter U1 stops working;

a2, the loading controller U2 sends a loading loop relay disconnection request signal to a vehicle control unit VCU after waiting for T1 seconds, the vehicle control unit VCU firstly disconnects a loading power supply switch SGD after receiving the loading loop relay disconnection request signal, then sends a loading loop relay disconnection command to the loading controller U2, and the loading controller U2 disconnects a first relay KA4.1 and a second relay KA4.2 after receiving the loading loop relay disconnection command and sends a loading power-off request signal to the vehicle control unit VCU;

a3, after receiving an on-load power-off request signal, the VCU sends an on-load power supply relay disconnection command to the high-voltage distribution controller HCM, and after receiving the on-load power supply relay disconnection command, the HCM disconnects the main loop relay KA3, and at the moment, the power battery stops supplying power for the U1.

In the step S1, the voltage difference between the front end and the rear end of the main loop relay KA3 is detected by a first voltmeter V1 and a second voltmeter V2, the first voltmeter V1 and the second voltmeter V2 are both electrically connected with the high-voltage distribution controller HCM, one end of the first voltmeter V1 is connected with a loop between the positive electrode of the power battery and one end of the precharge relay KA2 and one end of the main loop relay KA3, the other end of the first voltmeter V1 is connected with a loop between the negative electrode of the power battery and one end of the second relay KA4.2, one end of the second voltmeter V2 is connected with a loop between the other end of the main loop relay KA3 and one end of the first relay KA4.1, and the other end of the second voltmeter V2 is connected with a loop between the other end of the first voltmeter V1 and one end of the second relay KA 4.2.

The resistor R1 and the main loop relay KA3 are connected with the first relay KA4.1 through the first safety switch FU 2.

The positive electrode of the storage battery is simultaneously connected with a positive electrode interface of a battery management system controller BMS, a positive electrode interface of a high-voltage distribution controller HCM, a positive electrode interface of a vehicle control unit VCU, an enabling interface EN of an upper controller U2, one end of an upper starting switch SKQ and one end of an upper power supply switch SGD through a second safety switch FU 3.

The second safety switch FU3 is connected with the upper power supply switch SGD through the third safety switch FU 4.

The second safety switch FU3 is connected with the enable interface EN of the upper controller U2 through a fourth safety switch FU 11.

The upper-mounted starting switch SKQ is connected with a storage battery power supply interface + XLV of the upper-mounted controller U2 through a five-way safety switch FU 12.

Compared with the prior art, the invention has the beneficial effects that:

the invention relates to a control method of a pure electric vehicle power-on and power-off control system, which comprises the steps that an upper loading controller U2 is communicated with controllers of a vehicle chassis through CAN lines, a vehicle control unit VCU sends an upper loading permission working signal to the upper loading controller U2 after an SGD switch is closed, the upper loading controller U2 sends an upper loading power supply request to the vehicle control unit VCU after receiving the upper loading permission working signal, the vehicle control unit VCU sends an upper loading power supply relay closing command to a high voltage distribution controller HCM after receiving the upper loading power supply relay closing command, the high voltage distribution controller HCM closes a pre-charging relay KA2 and a main loop relay KA3 after receiving the upper loading power supply relay closing command, pre-charging is started, after the pre-charging is finished, the high voltage distribution controller HCM firstly opens the pre-charging relay KA2 and then sends an upper loading power supply relay closing signal to the vehicle control unit VCU, the vehicle control unit VCU sends an upper loading loop relay closing command to the upper loading controller U2 after receiving the upper loading power supply relay closing signal The utility model discloses a power battery protection device, including upper-mounted controller U2, upper-mounted controller U4, upper-mounted controller U2 is connected with chassis, upper-mounted controller U2 closes upper-mounted power supply relay KA4 after receiving upper-mounted return circuit relay closing command, this design has strengthened the information interaction between upper-mounted and the chassis, thereby avoid the upper-mounted system to take place to damage, the system nature and the security of electricity on the vehicle have been improved, on the other hand, upper-mounted controller U2 detects received from battery management system controller BMS's the maximum allowable current just can closed work relay KA5 when being greater than the rated demand current of upper-mounted, this design can be when guaranteeing the normal work of upper-mounted, avoid using the power battery damage that leads to the electricity is too big. Therefore, the invention not only enhances the information interaction between the upper garment and the chassis, improves the systematicness and safety of vehicle electrification, but also can avoid the damage of the power battery caused by overlarge electricity consumption.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is a power-up control flow diagram of the present invention.

Fig. 3 is a power-down control flow chart of the present invention.

In the figure, a power cell 1 and a storage battery 2 are shown.

Detailed Description

The present invention will be further described with reference to the following embodiments.

Referring to fig. 1 to 3, a control method of a power-on and power-off control system of a pure electric vehicle includes a power battery 1, a battery management system controller BMS, a high-voltage power distribution controller HCM, a storage battery 2, a vehicle control unit VCU, a frequency converter U1, an upper controller U2, an upper ac motor M, wherein the vehicle control unit VCU, the high-voltage power distribution controller HCM, the battery management system controller BMS, and the upper controller U2 are in signal connection via CAN lines;

the positive electrode of the power battery 1 is connected with one end of a pre-charging relay KA2 and one end of a main loop relay KA3, the other end of the pre-charging relay KA2 is connected with one end of a resistor R1, the other end of the resistor R1 and the other end of the main loop relay KA3 are connected with the positive electrode IN + of the direct current input end of the frequency converter U1 through a relay KA4.1 IN an upper power supply relay KA4, the negative electrode of the power battery 1 is connected with the negative electrode IN-of the direct current input end of the frequency converter U1 through a relay KA4.2 IN the upper power supply relay KA4, the output end of the frequency converter U1 is connected with one end of an upper alternating current motor M, the GND end of the frequency converter U1 and the other end of the upper alternating current motor M are grounded, and a working relay KA5 for controlling the on-off of the frequency converter U1 is arranged on the frequency converter U1;

the positive electrode of the storage battery 2 is simultaneously connected with a positive electrode interface 12V + of a battery management system controller BMS, a positive electrode interface 12V + of a high-voltage power distribution controller HCM, a positive electrode interface 12V + of a vehicle control unit VCU, an enable interface EN of an upper controller U2, one end of an upper starting switch SKQ and one end of an upper power supply switch SGD, the GND end of the upper controller U2 is grounded, the other end of the upper starting switch SKQ is connected with a storage battery power supply interface + XLV of an upper controller U2, the other end of the upper power supply switch SGD is connected with a pin V of the vehicle control unit VCU, and the negative electrode of the storage battery 2 is grounded and then simultaneously connected with a negative electrode interface 12V-of the high-voltage power distribution controller HCM, a negative electrode interface 12V-of the battery management system controller BMS and a negative electrode interface 12V-of the vehicle control unit VCU;

the pre-charging relay KA2 and the main loop relay KA3 are electrically connected with the high-voltage distribution controller HCM, and the upper power supply relay KA4 and the working relay KA5 are electrically connected with the upper controller U2.

The control method comprises power-on control, and the power-on control sequentially comprises the following steps:

s1, after the storage battery 2 supplies power to the power-on and power-off control system at low voltage, the vehicle control unit VCU closes the power supply switch SGD, then sending an uploading permission working signal to an uploading controller U2, sending an uploading power supply request to a vehicle control unit VCU after the uploading permission working signal is received by the uploading controller U2, the VCU of the vehicle controller sends a closing command of the loading power supply relay to the high voltage distribution controller HCM after receiving the loading power supply request signal, the high-voltage distribution controller HCM closes the pre-charging relay KA2 after receiving the closing command of the upper power supply relay, then, whether the reduction amplitude of the pressure difference between the front end and the rear end of the main circuit relay KA3 before and after the pre-charging relay KA2 is closed does not exceed a design value or not is judged, if yes, closing a main loop relay KA3 by the high-voltage distribution controller HCM to start pre-charging, if not, stopping charging and reporting a fault;

s2, after the pre-charging is completed, the high-voltage distribution controller HCM firstly disconnects a pre-charging relay KA2 and then sends a closing signal of an upper charging power supply relay to a vehicle control unit VCU, the vehicle control unit VCU sends a closing command of the upper charging loop relay to an upper charging controller U2 after receiving the closing signal of the upper charging power supply relay, the upper charging controller U2 firstly closes a first relay KA4.1 and a second relay KA4.2 after receiving the closing command of the upper charging loop relay, at the moment, the power battery 1 starts to supply power for the high voltage of the frequency converter U1, and then closes an upper charging starting switch SKQ;

and S3, when the upper controller U2 detects that the maximum allowable current received from the battery management system controller BMS is larger than the rated upper requirement current, closing the working relay KA5, starting the frequency converter U1, converting the high-voltage direct current into alternating current by the frequency converter U1 to supply power to the upper alternating current motor M, and starting the upper alternating current motor M to work.

The control method further comprises a power-off control, which comprises the following steps in sequence:

a1, when the upper controller U2 detects that an upper starting switch SKQ is disconnected or the maximum allowable current received from a battery management system controller BMS is not larger than the upper rated demand current, a working relay KA5 is controlled to be disconnected, and the frequency converter U1 stops working;

a2, the loading controller U2 sends a loading loop relay disconnection request signal to a vehicle control unit VCU after waiting for T1 seconds, the vehicle control unit VCU firstly disconnects a loading power supply switch SGD after receiving the loading loop relay disconnection request signal, then sends a loading loop relay disconnection command to the loading controller U2, and the loading controller U2 disconnects a first relay KA4.1 and a second relay KA4.2 after receiving the loading loop relay disconnection command and sends a loading power-off request signal to the vehicle control unit VCU;

a3, after receiving an on-load power-off request signal, the VCU sends an on-load power supply relay disconnection command to the high-voltage distribution controller HCM, and after receiving the on-load power supply relay disconnection command, the high-voltage distribution controller HCM disconnects the main loop relay KA3, and at the moment, the power battery 1 stops supplying power to the U1 at high voltage.

In the step S1, the voltage difference between the front end and the rear end of the main loop relay KA3 is detected by a first voltmeter V1 and a second voltmeter V2, the first voltmeter V1 and the second voltmeter V2 are both electrically connected with the high-voltage distribution controller HCM, one end of the first voltmeter V1 is connected with a loop between the positive electrode of the power battery 1 and one end of the precharge relay KA2, and one end of the main loop relay KA3, the other end of the first voltmeter V1 is connected with a loop between the negative electrode of the power battery 1 and one end of the second relay KA4.2, one end of the second voltmeter V2 is connected with a loop between the other end of the main loop relay KA3 and one end of the first relay KA4.1, and the other end of the second voltmeter V2 is connected with a loop between the other end of the first voltmeter V1 and one end of the second relay KA 4.2.

The resistor R1 and the main loop relay KA3 are connected with the first relay KA4.1 through the first safety switch FU 2.

The positive electrode of the storage battery 2 is simultaneously connected with a positive electrode interface of a battery management system controller BMS, a positive electrode interface of a high-voltage distribution controller HCM, a positive electrode interface of a vehicle control unit VCU, an enabling interface EN of an upper controller U2, one end of an upper starting switch SKQ and one end of an upper power supply switch SGD through a second safety switch FU 3.

The second safety switch FU3 is connected with the upper power supply switch SGD through the third safety switch FU 4.

The second safety switch FU3 is connected with the enable interface EN of the upper controller U2 through a fourth safety switch FU 11.

The upper-mounted starting switch SKQ is connected with a storage battery power supply interface + XLV of the upper-mounted controller U2 through a five-way safety switch FU 12.

The principle of the invention is illustrated as follows:

the invention relates to a power battery 1 and a storage battery 2 in a pure electric vehicle power-on and power-off control system, wherein the power battery 1 and the storage battery 2 are components of a whole vehicle chassis, the power battery 1 and the storage battery 2 are respectively used for providing a high-voltage power supply and a low-voltage power supply, and a high-voltage distribution controller HCM, a pre-charging relay KA2, a main loop relay KA3, a resistor R1, a first safety switch FU2, a first voltmeter V1 and a second voltmeter V2 jointly form a high-voltage distribution unit for controlling the distribution of the high-voltage power supply, wherein a pin a and a pin b of the high-voltage distribution controller HCM respectively control coils of the pre-charging relay KA2 and the main loop relay KA3, a pin z of the high-voltage distribution controller HCM is a public end, the pre-charging relay KA2, the main loop relay KA3 and the resistor R1 jointly form a pre-charging circuit, the first safety switch FU2 is a whole vehicle chassis power supply branch fuse, and the upper controller U2, a frequency converter U1 and a frequency converter U1 are connected with the pre-charging circuit, The upper-mounted alternating current motor M, the third safety switch FU4, the working relay KA5, the fourth safety switch FU11 and the fifth safety switch FU12 form an upper-mounted system together, wherein, the pin P1 and the pin P2 of the upper controller U2 respectively control the coil of a three-way safety switch FU4 and a working relay KA5, the pin COM is a common terminal, the relay is closed when the coil is electrified, the relay is opened when the coil is deenergized, the third safety switch FU4 controls the on-off of the power supply in the upper system, the frequency converter U1 converts high-voltage direct current into alternating current to supply power to the upper alternating current motor M, the working relay KA5 controls the start and stop of the frequency converter U1, the upper power supply switch SGD executes the upper power supply operation and sends the upper power supply information to a pin V of a VCU of the vehicle control unit, the mounting start switch SKQ performs a mounting start operation and sends a mounting start signal to a pin EN of the mounting controller U2.

Example 1:

referring to fig. 1 and 2, a control method of a power-on and power-off control system of a pure electric vehicle comprises a power battery 1, a battery management system controller BMS, a high-voltage distribution controller HCM, a storage battery 2, a vehicle control unit VCU, a frequency converter U1, an upper controller U2, an upper ac motor M, a first voltmeter V1 and a second voltmeter V2, wherein the vehicle control unit VCU, the high-voltage distribution controller HCM, the battery management system controller BMS and the upper controller U2 are in signal connection through CAN lines, a positive electrode of the power battery 1 is connected with one end of a pre-charging relay KA2 and one end of a main loop relay KA3, the other end of the pre-charging relay KA2 is connected with one end of a resistor R1, the other end of the resistor R1 and the other end of the main loop KA3 are both connected with one end of a first relay KA4.1 in the upper power supply relay KA4 through a first safety switch FU2, the other end of the first relay KA4.1 is connected with the positive electrode IN + of the direct-current input end of the frequency converter U1, the negative electrode of the power battery 1 is connected with the negative electrode IN-of the direct-current input end of the frequency converter U1 through the second relay KA4.2 IN the upper power supply relay KA4, the output end of the frequency converter U1 is connected with one end of the upper alternating-current motor M, the GND end of the frequency converter U1 and the other end of the upper alternating-current motor M are grounded, the frequency converter U1 is provided with a working relay KA5 for controlling the frequency converter U1 to start and stop, the positive electrode of the storage battery 2 is connected with one end of a second safety switch FU3, the other end of the second safety switch FU3 is simultaneously connected with the positive electrode interface 12V + of the battery management system controller BMS, the positive electrode interface 12V + of the high-voltage distribution controller HCM, the one end of a third safety switch FU4, one end of a fourth safety switch FU11 and one end of the upper starting switch SKQ, The positive electrode interface 12V + of the VCU of the whole vehicle controller is connected, the other end of the third safety switch FU4 is connected with a pin V of the VCU of the whole vehicle controller through an upper power supply switch SGD, the other end of the fourth safety switch FU11 is connected with an enable interface EN of an upper controller U2, the other end of the upper starting switch SKQ is connected with a storage battery power supply interface + XLV of the upper controller U2 through a fifth safety switch FU12, the negative electrode of the storage battery 2 is grounded and simultaneously connected with the negative electrode interface 12V of the high-voltage power distribution controller HCM, the negative electrode interface 12V of the battery management system controller BMS and the negative electrode interface 12V-of the VCU of the whole vehicle controller, the pre-charging relay KA2 and the main loop relay KA3 are respectively and electrically connected with a pin b and a pin a of the high-voltage power distribution controller HCM, the upper power supply relay 4 and the working relay KA5 are respectively connected with a pin P1 and a pin b of the upper controller U2, A pin P2 is electrically connected, a first voltmeter V1 and a second voltmeter V2 are respectively and electrically connected with a pin S1 and a pin S2 of a high-voltage distribution controller HCM, one end of a first voltmeter V1 is connected with a loop between the positive electrode of a power battery 1 and one end of a pre-charging relay KA2 and one end of a main loop relay KA3, the other end of the first voltmeter V1 is connected with a loop between the negative electrode of the power battery 1 and one end of a second relay KA4.2, one end of a second voltmeter V2 is connected with a loop between the other end of the main loop relay KA3 and one end of the first relay KA4.1, and the other end of the second voltmeter V2 is connected with a loop between the other end of the first voltmeter V1 and one end of the second relay KA 4.2;

the control method comprises power-on control, and the power-on control specifically comprises the following steps:

s1, after the storage battery 2 supplies power to the power-on and power-off control system at low voltage, the vehicle control unit VCU closes the power supply switch SGD, then sending an uploading permission working signal to an uploading controller U2, sending an uploading power supply request to a vehicle control unit VCU after the uploading permission working signal is received by the uploading controller U2, the VCU of the vehicle controller sends a closing command of the loading power supply relay to the high voltage distribution controller HCM after receiving the loading power supply request signal, the high-voltage distribution controller HCM closes the pre-charging relay KA2 after receiving the closing command of the upper power supply relay, then, whether the reduction amplitude of the pressure difference between the front end and the rear end of the main circuit relay KA3 in 2s before and after the pre-charging relay KA2 is closed is not more than 20V or not is judged, if yes, closing a main loop relay KA3 by the high-voltage distribution controller HCM to start pre-charging, if not, stopping charging and reporting a fault;

the differential pressure of the front end and the rear end of the main loop relay KA3 is detected by a first voltmeter V1 and a second voltmeter V2;

s2, after the pre-charging is completed, the high-voltage distribution controller HCM firstly disconnects a pre-charging relay KA2 and then sends a closing signal of an upper charging power supply relay to a vehicle control unit VCU, the vehicle control unit VCU sends a closing command of the upper charging loop relay to an upper charging controller U2 after receiving the closing signal of the upper charging power supply relay, the upper charging controller U2 firstly closes a first relay KA4.1 and a second relay KA4.2 after receiving the closing command of the upper charging loop relay, at the moment, the power battery 1 starts to supply power for the high voltage of the frequency converter U1, and then closes an upper charging starting switch SKQ;

and S3, when the upper controller U2 detects that the maximum allowable current received from the battery management system controller BMS is larger than the rated upper requirement current, closing the working relay KA5, starting the frequency converter U1, converting the high-voltage direct current into alternating current by the frequency converter U1 to supply power to the upper alternating current motor M, and starting the upper alternating current motor M to work.

Example 2:

referring to fig. 3, the control method further includes a power-off control, which specifically includes the following steps:

a1, when the upper controller U2 detects that an upper starting switch SKQ is disconnected or the maximum allowable current received from a battery management system controller BMS is not larger than the upper rated demand current, a working relay KA5 is controlled to be disconnected, and the frequency converter U1 stops working;

a2, the loading controller U2 sends a loading loop relay disconnection request signal to a vehicle control unit VCU after waiting for 1 second, the vehicle control unit VCU firstly disconnects an loading power supply switch SGD after receiving the loading loop relay disconnection request signal, then sends a loading loop relay disconnection command to the loading controller U2, and the loading controller U2 disconnects a first relay KA4.1 and a second relay KA4.2 after receiving the loading loop relay disconnection command and sends a loading power-off request signal to the vehicle control unit VCU;

a3, after receiving an on-load power-off request signal, the VCU sends an on-load power supply relay disconnection command to the high-voltage distribution controller HCM, and after receiving the on-load power supply relay disconnection command, the high-voltage distribution controller HCM disconnects the main loop relay KA3, and at the moment, the power battery 1 stops supplying power to the U1 at high voltage.