CN111806365B - High-voltage power-on method, device and system for hybrid electric vehicle - Google Patents

High-voltage power-on method, device and system for hybrid electric vehicle Download PDF

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Publication number
CN111806365B
CN111806365B CN202010669678.4A CN202010669678A CN111806365B CN 111806365 B CN111806365 B CN 111806365B CN 202010669678 A CN202010669678 A CN 202010669678A CN 111806365 B CN111806365 B CN 111806365B
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voltage
converter
charging
hybrid
power
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CN111806365A (en
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张雷
高崴
黄城健
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FAW Jiefang Automotive Co Ltd
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FAW Jiefang Automotive Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Abstract

The invention discloses a high-voltage power-on method, device and system for a hybrid electric vehicle. The method comprises the following steps: after the low-voltage power supply module powers on the DC-DC converter and the hybrid power controller, a pre-charging starting instruction is sent to the DC-DC converter, the DC-DC converter is controlled to enter a pre-charging starting mode, so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter, pre-charging is determined to be completed, and the high-voltage energy storage module is controlled to transmit high voltage to the capacitive load. According to the embodiment of the invention, the DC-DC converter is controlled by the hybrid power controller to pre-charge the capacitive load, a pre-charging relay and a pre-charging resistor in a high-voltage network are eliminated, the system cost is effectively reduced, the wiring harness arrangement is simplified, the space layout of the whole vehicle is easier, and the cost is reduced.

Description

High-voltage power-on method, device and system for hybrid electric vehicle
Technical Field
The embodiment of the invention relates to the technology of hybrid electric vehicles, in particular to a high-voltage power-on method, device and system of a hybrid electric vehicle.
Background
With the increasing energy crisis and environmental pollution, new energy vehicle technology enters a rapidly developed motorway like bamboo shoots in spring after raining, and the development of new energy vehicles with high efficiency, energy conservation and low noise becomes a necessary trend for the development of domestic and foreign automobile enterprises.
In order to improve the dynamic property of a new energy vehicle and reduce the weight of a vehicle cable, the voltage of the new energy vehicle is increased to hundreds of volts from 12V/24V of a traditional vehicle, meanwhile, a motor controller and other high-voltage electronic controllers of the new energy vehicle are often internally integrated with high-capacity high-voltage capacitors which are different from hundreds of uF to thousands of uF, and at the moment of short circuit of the high-voltage capacitors, the current is very large enough to burn high-voltage electronic equipment. Therefore, a special pre-charging circuit is required to be designed on the new energy vehicle to pre-charge the high-voltage load before power-on. The pre-charging is an essential important link in the new energy automobile, and the pre-charging is mainly used for pre-charging a large capacitor of a motor controller (namely an inverter) so as to reduce spark arcing when a main relay is closed, reduce current impact, improve the electric durability of the main relay and increase safety.
The existing high-voltage pre-charging function of the high-voltage load is realized mainly through a pre-charging loop formed by a pre-charging relay and a resistor, and due to the pre-charging relay and the resistor, the whole vehicle is large in size, difficult in wiring harness arrangement and high in cost.
Disclosure of Invention
The invention provides a high-voltage power-on method, a device and a system of a hybrid electric vehicle, wherein a DC-DC converter is controlled by a hybrid electric controller to pre-charge a capacitive load, a pre-charging relay and a pre-charging resistor in a high-voltage network are eliminated, the system cost is effectively reduced, the wiring harness arrangement is simplified, the space layout of the whole vehicle is easier, and the cost is reduced.
In a first aspect, an embodiment of the present invention provides a high-voltage power-on method for a hybrid electric vehicle, which is applied to a hybrid controller, and includes:
after a low-voltage power supply module powers on a DC-DC converter and a hybrid power controller, sending a pre-charging starting instruction to the DC-DC converter, and controlling the DC-DC converter to enter a pre-charging starting mode so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter;
determining that the pre-charging is complete;
and controlling the high-voltage energy storage module to deliver high voltage to the capacitive load.
Optionally, the determining that the pre-charging is completed includes:
receiving a charging feedback signal returned by the high-voltage network;
judging whether the pre-charging is finished or not according to the charging feedback signal;
if so, sending a low-power-consumption operation instruction to the DC-DC converter to control the DC-DC converter to enter a low-power-consumption operation mode;
if not, controlling the counting of the first counter to increase by 1;
judging whether the count value of the first counter reaches a first threshold value;
if yes, sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode;
if not, returning to execute the step of judging whether the pre-charging is finished according to the charging feedback signal.
Optionally, the high voltage energy storage module includes a power switch, and when the power switch is turned off, the high voltage energy storage module transmits high voltage to the capacitive load, and the controlling the high voltage energy storage module transmits high voltage to the capacitive load includes:
sending a closing signal to the power switch to control the power switch to close;
judging whether the power switch is closed or not according to a switch feedback signal sent by the high-voltage energy storage module;
if not, controlling the counting of the second counter to increase by 1;
judging whether the count value of the second counter reaches a second threshold value;
if yes, sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode;
if not, returning to the step of judging whether the power switch is closed according to a switch feedback signal sent by the power switch.
In a second aspect, an embodiment of the present invention further provides a high-voltage power-on method for a hybrid vehicle, which is applied to a DC-DC converter, and includes:
and entering a pre-charging starting mode according to a pre-charging starting command from the hybrid power controller so as to pre-charge the capacitive load.
Optionally, the high-voltage power-on method for the hybrid electric vehicle further includes:
entering a low-power-consumption operation mode according to a low-power-consumption operation instruction from the hybrid controller;
and entering a fault diagnosis mode according to a fault diagnosis command from the hybrid controller.
Optionally, the entering of the pre-charge start mode according to the pre-charge start command from the hybrid controller includes:
when the DC-DC converter is determined to enter a pre-charging starting mode, setting step voltage and step total duration time according to a high-voltage network equivalent circuit model;
chopping the voltage input by the low-voltage power supply module according to a closed-loop control signal, and outputting a pre-charging voltage according to the step voltage and the total step duration time so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter.
Optionally, after the chopping is performed on the voltage input by the low-voltage power supply module according to the closed-loop control signal, the method further includes:
judging whether the output pre-charging voltage is equal to the step voltage or not;
if yes, waiting for a low-power-consumption operation instruction of the hybrid power controller;
if not, controlling the counting of the third counter to increase by 1;
judging whether the count value of the third counter reaches a third threshold value;
if yes, entering a fault diagnosis mode;
if not, returning to the step of judging whether the output pre-charging voltage is equal to the step voltage or not.
In a third aspect, an embodiment of the present invention further provides a high voltage power-on device for a hybrid electric vehicle, which is applied to a hybrid controller, and includes:
the pre-charging starting instruction sending module is used for sending a pre-charging starting instruction to the DC-DC converter after the low-voltage power supply module powers on the DC-DC converter and the hybrid power controller, and controlling the DC-DC converter to enter a pre-charging starting mode so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter;
a determination module to determine that the pre-charging is complete;
and the high-voltage transmission control module is used for controlling the high-voltage energy storage module to transmit high voltage to the capacitive load.
In a fourth aspect, an embodiment of the present invention further provides a high-voltage power-on device for a hybrid vehicle, which is applied to a DC-DC converter, and includes:
and the mode switching module is used for entering a pre-charging starting mode according to a pre-charging starting command from the hybrid power controller so as to pre-charge the capacitive load.
In a fifth aspect, an embodiment of the present invention further provides a high voltage power-on system for a hybrid electric vehicle, including: the system comprises a hybrid power controller, a low-voltage power supply module, a high-voltage energy storage module, a DC-DC converter and a capacitive load;
the low-voltage power supply module is respectively connected with the DC-DC converter and the hybrid power controller and is used for supplying power to the DC-DC converter and the hybrid power controller;
the hybrid power controller is respectively connected with the control end of the DC-DC converter, the control end of the high-voltage energy storage module and the control end of the capacitive load;
the output end of the DC-DC converter and the output end of the high-voltage energy storage module are both connected with the capacitive load.
The high-voltage power-on method of the hybrid electric vehicle is applied to a hybrid controller, after a low-voltage power supply module powers on a DC-DC converter and the hybrid controller, a pre-charging starting command is sent to the DC-DC converter, the DC-DC converter is controlled to enter a pre-charging starting mode, so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter, pre-charging is determined to be completed, and a high-voltage energy storage module is controlled to deliver high-voltage electricity to the capacitive load. According to the embodiment of the invention, the DC-DC converter is controlled by the hybrid power controller to pre-charge the capacitive load, a pre-charging relay and a pre-charging resistor in a high-voltage network are eliminated, the system cost is effectively reduced, the wiring harness arrangement is simplified, the space layout of the whole vehicle is easier, and the cost is reduced.
Drawings
Fig. 1 is a flowchart of a high-voltage power-on method for a hybrid electric vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart of a high-voltage power-on method for a hybrid electric vehicle according to a second embodiment of the present invention;
fig. 3 is a flowchart of a high-voltage power-on method for a hybrid electric vehicle according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a high-voltage power-on device of a hybrid electric vehicle according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a high-voltage power-on device of a hybrid electric vehicle according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a high-voltage power-on system of a hybrid electric vehicle according to a sixth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a computer device according to a seventh embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a high-voltage power-on method for a hybrid electric vehicle according to an embodiment of the present invention, where the method is applicable to a situation of high-voltage power-on of a capacitive load of a hybrid electric vehicle, and the method can be executed by a high-voltage power-on device for a hybrid electric vehicle according to an embodiment of the present invention, where the device can be implemented in a software and/or hardware manner and is integrated into a hybrid controller according to an embodiment of the present invention, as shown in fig. 1, the method specifically includes the following steps:
s101, after the low-voltage power supply module powers on the DC-DC converter and the hybrid power controller, a pre-charging starting instruction is sent to the DC-DC converter, and the DC-DC converter is controlled to enter a pre-charging starting mode.
The low-voltage power supply module may be a storage battery, such as a lead-acid battery pack. The DC-DC converter may be a bidirectional DC-DC converter through which the low voltage supply module precharges the capacitive load. A Hybrid Control Unit (HCU) is a core Control component of the entire Hybrid vehicle, and corresponds to the brain of the vehicle. The automobile brake system collects signals of an accelerator pedal, signals of a brake pedal and other parts, and controls the action of each part controller on the lower layer after corresponding judgment is made, so as to drive the automobile to normally run. As a command management center of an automobile, the main functions of the whole automobile controller comprise: the system comprises a driving torque control device, a brake energy optimization control device, a whole vehicle energy management device, a CAN network maintenance and management device, a fault diagnosis and treatment device, a vehicle state monitoring device and the like, wherein the driving torque control device, the brake energy optimization control device, the whole vehicle energy management device, the CAN network maintenance and management device, the fault diagnosis and treatment device, the vehicle state monitoring device and the like play a role in controlling vehicle operation.
Specifically, the low-voltage power supply module is respectively connected with the DC-DC converter and the hybrid controller through low-voltage wiring harnesses, and the low-voltage power supply module supplies power to the DC-DC converter and the hybrid controller through the low-voltage wiring harnesses. The hybrid controller is connected with the control end of the DC-DC converter through a low-voltage wiring harness, and the output end of the DC-DC converter is connected with the capacitive load through a high-voltage wiring harness. After the DC-DC converter and the hybrid power controller are powered on, the hybrid power controller sends a pre-charging starting command to the DC-DC converter, and controls the DC-DC converter to enter a pre-charging starting mode, so that the low-voltage power supply module pre-charges the capacitive load through the DC-DC converter.
The DC-DC converter may have a pre-charge start-up mode, in which the DC-DC converter converts the DC power from the low-voltage power supply module into a pre-charge voltage required by the capacitive load. Capacitive loads generally refer to loads with capacitive parameters, i.e., loads that meet voltage hysteresis current characteristics. When the capacitive load is charged and discharged, the voltage cannot change suddenly, the corresponding power factor is a negative value, and the corresponding power factor of the inductive load is a positive value. In an embodiment of the present invention, the capacitive load is an electric motor assembly, and the electric motor assembly includes one or more assemblies composed of an electric motor body, a power unit and a control unit. The power unit is connected to the DCDC converter, and the control unit is connected to the hybrid controller. The DC-DC converter converts the direct current from the low-voltage power supply module into a pre-charging voltage required by a power unit in the motor assembly, and pre-charges the power unit.
S102, determining that the pre-charging is completed.
Specifically, in the process of precharging the capacitive load, the voltage of the high-voltage network is gradually increased, the hybrid power controller collects the voltage of the high-voltage network at a certain time interval to serve as a precharge feedback signal, and the precharge feedback signal reflects the voltage of the high-voltage network to determine whether precharging is finished. The high-voltage network consists of a high-voltage energy storage module, a capacitive load and a high-voltage wire harness. Specifically, when the voltage of the high-voltage network reaches a preset voltage, the capacitive load is precharged. After receiving the pre-charging feedback signal, the hybrid controller analyzes the pre-charging feedback signal and determines whether pre-charging is finished. After it is determined that the precharge is completed, execution proceeds to step S103.
And S103, controlling the high-voltage energy storage module to transmit high voltage electricity to the capacitive load.
The high-voltage energy storage module may include a power switch, an energy storage device, and a control circuit, where the energy storage device may be a high-voltage energy storage battery or a super capacitor, and the embodiment of the present invention is not limited herein. Specifically, the output end of the high-voltage energy storage module (i.e., the output end of the control circuit) is connected with the capacitive load through a high-voltage wire harness, and the control end of the high-voltage energy storage module (i.e., the power switch) is connected with the hybrid controller through a low-voltage wire harness.
After the hybrid power controller determines that the pre-charging is completed, the hybrid power controller sends an opening instruction to the high-voltage energy storage module to control the power switch to be closed, and the high-voltage energy storage module transmits high-voltage electricity to the capacitive load through the high-voltage wire harness.
The high-voltage power-on method of the hybrid electric vehicle is applied to a hybrid controller, after a low-voltage power supply module powers on a DC-DC converter and the hybrid controller, a pre-charging starting command is sent to the DC-DC converter, the DC-DC converter is controlled to enter a pre-charging starting mode, so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter, pre-charging is determined to be completed, and a high-voltage energy storage module is controlled to deliver high-voltage electricity to the capacitive load. According to the embodiment of the invention, the DC-DC converter is controlled by the hybrid power controller to pre-charge the capacitive load, a pre-charging relay and a pre-charging resistor in a high-voltage network are eliminated, the system cost is effectively reduced, the wiring harness arrangement is simplified, the space layout of the whole vehicle is easier, and the cost is reduced.
Example two
Fig. 2 is a flowchart of a high-voltage power-on method for a hybrid electric vehicle according to a second embodiment of the present invention, where the second embodiment of the present invention is optimized based on the first embodiment, and details of a specific process in the second embodiment of the present invention are described, specifically, as shown in fig. 2, the method according to the second embodiment of the present invention may include the following steps:
s201, after the low-voltage power supply module powers on the DC-DC converter and the hybrid power controller, a pre-charging starting instruction is sent to the DC-DC converter, and the DC-DC converter is controlled to enter a pre-charging starting mode.
Specifically, after the DC-DC converter and the hybrid controller are powered on, the hybrid controller sends a pre-charge start command to the DC-DC converter to control the DC-DC converter to enter a pre-charge start mode, and the DC-DC converter converts direct current from the low-voltage power supply module into pre-charge voltage required by a power unit in the motor assembly to pre-charge the power unit.
And S202, receiving a charging feedback signal returned by the high-voltage network.
Specifically, in the process of precharging the capacitive load, the voltage of the high-voltage network is gradually increased, and the hybrid power controller acquires the voltage of the high-voltage network at a certain time interval as a precharge feedback signal to determine whether precharging is finished. The high-voltage network consists of a high-voltage energy storage module, a capacitive load and a high-voltage wire harness.
And S203, judging whether the pre-charging is finished or not according to the charging feedback signal.
Specifically, after receiving the precharge feedback signal, the hybrid controller analyzes the precharge feedback signal to determine whether the precharge is completed.
If not, executing steps S204-S205; if yes, go to step S206-step S211.
And S204, controlling the counting of the first counter to be increased by 1.
Specifically, in step S203, if it is determined that the precharge is not completed, the hybrid controller controls the count of the first counter therein to be increased by 1.
S205, whether the count value of the first counter reaches a first threshold value is judged.
If yes, go to step S211. Specifically, when it is determined that the count value of the first counter reaches the first threshold, which indicates that the precharge of the capacitive load is still not completed after the hybrid controller receives the precharge feedback signal for the number of times of the first threshold, that is, the precharge fails, step S211 is executed: and sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode.
If not, the process returns to step S203. Specifically, when it is determined that the count value of the first counter does not reach the first threshold, the process returns to step S203 until it is determined that the precharge is completed or the count value of the first counter reaches the first threshold.
And S206, sending a low-power-consumption operation instruction to the DC-DC converter to control the DC-DC converter to enter a low-power-consumption operation mode.
Specifically, in step S203, the hybrid controller sends a low power consumption operation command to the DC-DC converter to control the DC-DC converter to enter a low power consumption operation mode when determining that the pre-charging is completed, so as to reduce the power consumption of the DC-DC converter.
And S207, sending a closing signal to the power switch to control the power switch to be closed.
Specifically, the high-voltage energy storage module comprises a power switch, and when the power switch is turned on, the high-voltage energy storage module transmits high voltage to the capacitive load. After the hybrid power controller determines that the pre-charging is completed, the hybrid power controller sends an opening instruction to the high-voltage energy storage module to control the power switch to be closed, and the high-voltage energy storage module transmits high-voltage electricity to the capacitive load through the high-voltage wire harness.
And S208, judging whether the power switch is closed or not according to the switch feedback signal sent by the high-voltage energy storage module.
Specifically, after receiving the closing signal, the high-voltage energy storage module controls the power switch to be closed, and sends a switch feedback signal to the hybrid controller at a certain time interval to inform the hybrid controller whether the power switch is normally closed. And after receiving the switch feedback signal, the hybrid power controller analyzes the switch feedback signal and determines whether the power switch is normally closed.
If yes, determining that the high-voltage electrification is finished; if not, step S209-step S211 are executed.
And S209, controlling the counting of the second counter to increase by 1.
Specifically, in step S208, if it is determined that the power switch is not normally closed, the hybrid controller controls the count of the second counter therein to be increased by 1.
S210, judging whether the count value of the second counter reaches a second threshold value.
If yes, go to step S211. Specifically, when it is determined that the count value of the second counter reaches the second threshold, which indicates that the power switch is still not normally closed after the hybrid controller receives the switch feedback signal for the number of times of the second threshold, that is, the high-voltage power-on fails, step S211 is executed: and sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode.
If not, the process returns to step S208. Specifically, when it is determined that the count value of the second counter does not reach the second threshold, the process returns to step S208 until it is determined that the power switch is normally closed, or the count value of the second counter reaches the second threshold.
And S211, sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode.
Specifically, when the count value of the first counter is determined to reach the first threshold value in step S205, or when the count value of the second counter is determined to reach the second threshold value in step S210, a fault diagnosis instruction is sent to the DC-DC converter to control the DC-DC converter to enter the fault diagnosis mode.
Specifically, in the above embodiment, the first counter and the second counter may be the same counter or different counters in the hybrid controller, and the first threshold and the second threshold may be equal or different, which is not limited herein.
The high-voltage power-on method of the hybrid electric vehicle is applied to a hybrid controller, after a low-voltage power supply module powers on a DC-DC converter and the hybrid controller, a pre-charging starting command is sent to the DC-DC converter, the DC-DC converter is controlled to enter a pre-charging starting mode, so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter, pre-charging is determined to be completed, and a high-voltage energy storage module is controlled to deliver high-voltage electricity to the capacitive load. According to the embodiment of the invention, the DC-DC converter is controlled by the hybrid power controller to pre-charge the capacitive load, a pre-charging relay and a pre-charging resistor in a high-voltage network are eliminated, the system cost is effectively reduced, the wiring harness arrangement is simplified, the space layout of the whole vehicle is easier, and the cost is reduced.
EXAMPLE III
Fig. 3 is a flowchart of a high-voltage power-on method for a hybrid vehicle according to a third embodiment of the present invention, where the method is applicable to a situation of high-voltage power-on of a capacitive load of a hybrid vehicle, and the method can be executed by a high-voltage power-on device for a hybrid vehicle according to a third embodiment of the present invention, where the device can be implemented in a software and/or hardware manner and is integrated into a DC-DC converter according to a third embodiment of the present invention, as shown in fig. 3, the method specifically includes the following steps:
and S301, entering a pre-charging starting mode according to a pre-charging starting command from the hybrid power controller so as to pre-charge the capacitive load.
Specifically, after the DC-DC converter and the hybrid controller are powered on, the hybrid controller sends a pre-charge start command to the DC-DC converter, controls the DC-DC converter to enter a pre-charge start mode according to the pre-charge start command from the hybrid controller, converts the direct current from the low-voltage power supply module into a pre-charge voltage required by a power unit in the motor assembly, and pre-charges the power unit.
And S302, entering a low-power-consumption operation mode according to a low-power-consumption operation instruction from the hybrid controller.
Specifically, in the process of precharging the capacitive load, the voltage of the high-voltage network is gradually increased, and the hybrid power controller acquires the voltage of the high-voltage network at a certain time interval as a precharge feedback signal to determine whether precharging is finished. After receiving the pre-charging feedback signal, the hybrid controller analyzes the pre-charging feedback signal and determines whether pre-charging is finished.
If so, the hybrid controller sends a low-power-consumption operation instruction to the DC-DC converter, and the DC-DC converter enters a low-power-consumption operation mode according to the low-power-consumption operation instruction from the hybrid controller.
If not, the hybrid power controller controls the count of a first counter inside the hybrid power controller to add 1, judges whether the count value of the first counter reaches a first threshold value, and sends a fault diagnosis instruction to the DC-DC converter if the count value of the first counter reaches the first threshold value; if the first threshold value is not reached, returning to execute the step of judging whether the pre-charging is finished according to the charging feedback signal.
After the hybrid power controller determines that the pre-charging is completed, the hybrid power controller sends an opening instruction to the high-voltage energy storage module to control the power switch to be closed, and the high-voltage energy storage module transmits high-voltage electricity to the capacitive load through the high-voltage wire harness. And after receiving the closing signal, the high-voltage energy storage module controls the power switch to be closed, and sends a switch feedback signal to the hybrid power controller at a certain time interval to inform the hybrid power controller whether the power switch is normally closed or not. And after receiving the switch feedback signal, the hybrid power controller analyzes the switch feedback signal and determines whether the power switch is normally closed.
And if so, determining that the high-voltage power-on is finished.
If not, controlling the count of the second counter to increase by 1, further judging whether the count value of the second counter reaches a second threshold value, and if so, sending a fault diagnosis instruction to the DC-DC converter; and if the current value does not reach the second threshold value, returning to execute the step of judging whether the power switch is closed according to a switch feedback signal sent by the high-voltage energy storage module.
And S303, entering a fault diagnosis mode according to a fault diagnosis command from the hybrid controller.
Specifically, in the above step, when the count value of the first counter reaches the first threshold value or when it is determined that the count value of the second counter reaches the second threshold value, the hybrid controller sends a failure diagnosis command to the DC-DC converter, and the DC-DC converter enters the failure diagnosis mode according to the failure diagnosis command from the hybrid controller.
The high-voltage power-on method of the hybrid electric vehicle is applied to the DC-DC converter, after the DC-DC converter and the hybrid controller are powered on by the low-voltage power supply module, the hybrid controller sends a pre-charging starting command to the DC-DC converter, and the DC-DC converter enters a pre-charging starting mode according to the pre-charging starting command from the hybrid controller so as to pre-charge a capacitive load. According to the embodiment of the invention, the DC-DC converter is controlled by the hybrid power controller to pre-charge the capacitive load, a pre-charging relay and a pre-charging resistor in a high-voltage network are eliminated, the system cost is effectively reduced, the wiring harness arrangement is simplified, the space layout of the whole vehicle is easier, and the cost is reduced.
In some embodiments of the present invention, the step S301 may include the following sub-steps:
s3011, when the DC-DC converter is determined to enter the pre-charging starting mode, step voltage and step total duration time are set according to the high-voltage network equivalent circuit model.
Specifically, when the DC-DC converter is determined to enter the pre-charging starting mode, the step voltage value V is set according to the high-voltage network equivalent circuit modeliDuration of step voltage tiThe number of steps n; the final value of the step voltage is equal to the starting voltage V of the high-voltage networksetThe duration of the total number of steps is equal to the high-pressure pre-starting time Tset(ii) a Namely:
Vn＝Vset
Figure GDA0003173426970000141
specifically, the process of establishing the equivalent circuit model of the high-voltage network is as follows:
calculating the equivalent resistance R of the high-voltage networkesrIncluding the equivalent resistance r of the high-voltage wire harness11Resistive load equivalent resistance r21Compatibility ofLoad equivalent resistance r31And satisfies the following formula:
Resr＝r11+r21//r31wherein r is21//r31Is represented by r21And r31The parallel resistance of (1).
Further, the high-voltage wire harness equivalent resistance r11According to the formula: r is11And calculating rho/s, wherein rho is the resistivity of the wire, l is the length of the wire harness, and s is the sectional area of the wire harness.
High-voltage network equivalent inductance LesrIn particular to the equivalent inductance L of the high-voltage wire harness11Equivalent inductance L of capacitive impedance21Equivalent inductance L of resistive load31And satisfies the following formula:
Lesr＝L11+L21//L31wherein L is21//L31Represents L21//L31The shunt inductance of (1).
Further, the equivalent inductance L of the high-voltage wire harness11According to the formula:
Figure GDA0003173426970000151
calculation of where is u0Vacuum magnetic permeability 4 pi x10-7L is the cable length and r is the cable radius.
The equivalent capacitance C of the high-voltage network is calculated according to the following formula:
C＝∑Ciin which C isiRepresenting the capacitance value of a single capacitive load.
According to the equivalent resistance R of the high-voltage networkesrEquivalent inductance L of high-voltage networkesrAnd calculating the transfer function G(s) of the high-voltage network by using the equivalent capacitance C of the high-voltage network:
Figure GDA0003173426970000152
where s denotes the complex frequency, ωnRepresenting the undamped oscillation frequency and ξ the damping coefficient.
Wherein the content of the first and second substances,
Figure GDA0003173426970000153
according to the high-voltage network transfer function, under the zero initial condition, obtaining a differential equation of the circuit through inverse Laplace transformation, and calculating the actual current peak value Ip of the capacitive load according to the following formula:
Figure GDA0003173426970000154
Figure GDA0003173426970000155
Ip＝i(t)|max
wherein U represents the input voltage, UCRepresenting the capacitive load voltage, i (t) representing the time-varying value of the capacitive load current, ωdRepresenting the ringing angular frequency and alpha representing the damping constant.
Calculating the rated current I of the high-voltage wire harness according to the selected wire diameter of the high-voltage wire harness1。
Setting output step voltage V of DC-DC converter in starting stagei。
Judging whether the actual current Ip of the capacitive load meets the following formula;
Ip<Icp,Ip<I1
if so, determining that the establishment of the high-voltage network equivalent circuit model is completed; if not, resetting the step voltage Vi。
S3012, chopping is conducted on the voltage input by the low-voltage power supply module according to the closed-loop control signal, and pre-charging voltage is output according to step voltage and the duration time of the step sum.
Specifically, the DC-DC converter chops the voltage input by the low-voltage power supply module according to the closed-loop control signal, outputs the precharge voltage according to the step voltage and the duration of the total number of steps, and precharges the capacitive load. In the embodiment of the present invention, the closed-loop control signal may be a Pulse Width Modulation (PWM) signal.
In the embodiment of the invention, the step voltage boosting control is realized by adopting the DC-DC converter, the step voltage value and the step voltage duration can be flexibly set according to the equivalent circuit model parameters, and the peak current appearing in the high-voltage network is limited by the step voltage value and the step voltage duration, so that the circuit safety is ensured while the power-on function of the high-voltage network is realized.
In some embodiments of the present invention, after step S3012, the method may further include:
s3013, judging whether the output pre-charge voltage is equal to the step voltage.
Specifically, the voltage output by the DC-DC converter is collected and compared with the set step voltage, and it is determined whether the output precharge voltage is equal to the set step voltage.
If yes, go to step S3014; if not, go to step S3015-
S3014, waiting for a low-power-consumption operation instruction of the hybrid power controller, and entering a low-power-consumption operation mode according to the low-power-consumption operation instruction.
And S3015, controlling the counting of the third counter to be increased by 1.
Specifically, in step S3013, if it is determined that the output precharge voltage is not equal to the step voltage, the DC-DC converter controls the count of the third counter therein to be incremented by 1.
S3016, judging whether the count value of the third counter reaches a third threshold value;
if yes, entering a fault diagnosis mode. And when the counting value of the third counter is determined to reach the third threshold, the number of times that the pre-charging voltage output by the DC-DC converter is unequal to the set step voltage reaches the third threshold number of times, namely, the pre-charging is failed, and then the fault diagnosis mode is entered.
If not, returning to the step of judging whether the output pre-charging voltage is equal to the step voltage or not. Specifically, when it is determined that the count value of the third counter has not reached the third threshold, the step of determining whether the output precharge voltage is equal to the step voltage is performed until it is determined that the precharge voltage output by the DC-DC converter is equal to the set step voltage or the count value of the third counter reaches the third threshold.
Example four
Fig. 4 is a schematic structural diagram of a hybrid electric vehicle high-voltage power-on device according to a fourth embodiment of the present invention, where the hybrid electric vehicle high-voltage power-on device according to the fourth embodiment of the present invention is applied to a hybrid controller, and as shown in fig. 4, the device may specifically include:
a pre-charging start instruction sending module 401, configured to send a pre-charging start instruction to the DC-DC converter after the low-voltage power supply module powers on the DC-DC converter and the hybrid controller, and control the DC-DC converter to enter a pre-charging start mode, so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter;
a determination module 402 for determining that the pre-charging is complete;
and a high-voltage transmission control module 403, configured to control the high-voltage energy storage module to transmit high voltage to the capacitive load.
In some embodiments of the invention, the determining module 402 may include:
the charging feedback signal receiving unit is used for receiving a charging feedback signal returned by the high-voltage energy storage module;
the first judgment unit is used for judging whether the pre-charging is finished or not according to the charging feedback signal;
if so, sending a low-power-consumption operation instruction to the DC-DC converter to control the DC-DC converter to enter a low-power-consumption operation mode;
if not, controlling the counting of the first counter to increase by 1;
a second determination unit configured to determine whether a count value of the first counter reaches a first threshold;
if yes, sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode;
if not, returning to execute the step of judging whether the pre-charging is finished according to the charging feedback signal.
In some embodiments of the present invention, the high voltage energy storage module comprises a power switch, when the power switch is closed, the high voltage energy storage module delivers high voltage to the capacitive load, and the high voltage delivery control module 403 may comprise:
the closing signal sending unit is used for sending a closing signal to the power switch so as to control the power switch to be closed;
the third judging unit is used for judging whether the power switch is closed or not according to a switch feedback signal sent by the high-voltage energy storage module;
if not, controlling the counting of the second counter to increase by 1;
a fourth judging unit configured to judge whether a count value of the second counter reaches a second threshold;
if yes, sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode;
if not, returning to the step of judging whether the power switch is closed according to a switch feedback signal sent by the power switch.
The hybrid electric vehicle high-voltage power-on device can execute the hybrid electric vehicle high-voltage power-on method provided by the first embodiment or the second embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a hybrid vehicle high-voltage power-on device according to a fifth embodiment of the present invention, where the hybrid vehicle high-voltage power-on device according to the fifth embodiment of the present invention is applied to a DC-DC converter, and as shown in fig. 5, the device may specifically include:
the mode switching module 501 is configured to enter a pre-charge start mode according to a pre-charge start command from the hybrid controller to pre-charge the capacitive load.
In some embodiments of the present invention, the mode switching module 501 is further configured to:
entering a low-power-consumption operation mode according to a low-power-consumption operation instruction from the hybrid controller; and entering a fault diagnosis mode according to a fault diagnosis command from the hybrid controller.
In some embodiments of the present invention, the mode switching module 501 may include:
the step voltage setting unit is used for setting step voltage and step total duration time according to the high-voltage network equivalent circuit model when the DC-DC converter is determined to enter a pre-charging starting mode;
and the chopping output unit is used for chopping the voltage input by the low-voltage power supply module according to a closed-loop control signal and outputting a pre-charging voltage according to the step voltage and the step total duration so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter.
In some embodiments of the invention, the apparatus may further comprise:
a fifth judging unit for judging whether the output precharge voltage is equal to the step voltage;
if yes, waiting for a low-power-consumption operation instruction of the hybrid power controller;
if not, controlling the counting of the third counter to increase by 1;
a sixth judging unit configured to judge whether or not the count value of the third counter reaches a third threshold;
if yes, entering a fault diagnosis mode;
if not, returning to the step of judging whether the output pre-charging voltage is equal to the step voltage or not.
The hybrid electric vehicle high-voltage power-on device can execute the hybrid electric vehicle high-voltage power-on method provided by the third embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE six
Fig. 6 is a schematic structural diagram of a high-voltage power-on system of a hybrid electric vehicle according to a sixth embodiment of the present invention, and as shown in fig. 6, the system includes: the system comprises a hybrid controller 601, a low-voltage power supply module 602, a high-voltage energy storage module 603, a DC-DC converter 604 and a capacitive load 605.
The low voltage power supply module 602 is connected to the DC-DC converter 604 and the hybrid controller 601 through low voltage wiring harnesses, respectively, and is configured to supply power to the DC-DC converter 604 and the hybrid controller 601.
The hybrid controller 601 is connected to the control terminal of the DC-DC converter 604, the control terminal of the high-voltage energy storage module 603, and the control terminal of the capacitive load 605 through low-voltage wiring harnesses.
The output terminal of the DC-DC converter 604 and the output terminal of the high voltage energy storage module 603 are both connected to the capacitive load 605 via a high voltage harness.
Specifically, after the DC-DC converter 604 and the hybrid controller 601 are powered on, the hybrid controller 601 sends a pre-charge start command to the DC-DC converter 604, and controls the DC-DC converter 604 to enter a pre-charge start mode, so that the low voltage power supply module 602 pre-charges the capacitive load 605 through the DC-DC converter 604. After the pre-charging is completed, the hybrid controller 601 sends an opening instruction to the high-voltage energy storage module 603, and controls the power switch of the high-voltage energy storage module 603 to be closed, so that the high-voltage energy storage module 603 transmits high voltage to the capacitive load 605.
The hybrid electric vehicle high-voltage power-on system can execute the hybrid electric vehicle high-voltage power-on method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE seven
A seventh embodiment of the present invention provides a computer device, and fig. 7 is a schematic structural diagram of a computer device provided in the seventh embodiment of the present invention, as shown in fig. 7, the computer device includes:
a processor 701, a memory 702, a communication module 703, an input device 704, and an output device 705; the number of the processors 701 in the computer device may be one or more, and one processor 701 is taken as an example in fig. 7; the processor 701, the memory 702, the communication module 703, the input device 704, and the output device 705 in the computer apparatus may be connected by a bus or other means, and fig. 7 illustrates an example of connection by a bus. The processor 701, the memory 702, the communication module 703, the input device 704, and the output device 705 described above may be integrated on a computer apparatus.
The memory 702 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as the modules corresponding to the hybrid vehicle high-voltage power-on method in the foregoing embodiments. The processor 701 executes various functional applications and data processing of the computer device by running the software programs, instructions and modules stored in the memory 702, so as to implement the above-mentioned high-voltage power-on method for the hybrid electric vehicle.
The memory 702 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the microcomputer, and the like. Further, the memory 702 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 702 may further include memory located remotely from the processor 701, which may be connected to an electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The communication module 703 is configured to establish a connection with an external device (e.g., an intelligent terminal), and implement data interaction with the external device. The input device 704 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the computer apparatus.
The computer device provided by the embodiment can execute the high-voltage power-on method of the hybrid electric vehicle provided by the first embodiment, the second embodiment and the third embodiment of the invention, and has corresponding functions and beneficial effects.
Example eight
An eighth embodiment of the present invention provides a storage medium containing computer-executable instructions, where the storage medium stores a computer program, and the computer program, when executed by a processor, implements the high-voltage power-on method for a hybrid electric vehicle according to any of the above embodiments of the present invention.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the hybrid vehicle high-voltage power-on method provided by the embodiments of the present invention.
It should be noted that, as for the apparatus, device, platform and storage medium embodiments, since they are substantially similar to the method embodiments, the description is simple, and in relation to the description, reference may be made to part of the description of the method embodiments.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, and the computer software product may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute the hybrid electric vehicle high-voltage power-on method according to any embodiment of the present invention.
It should be noted that, in the above apparatus, each included module and unit are merely divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, the specific names of the functional modules are only for convenience of distinguishing from each other and are not used for limiting the protection scope of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by suitable instruction execution devices. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (7)

1. A high-voltage power-on method of a hybrid electric vehicle is characterized by being applied to a hybrid controller and comprising the following steps:
after a low-voltage power supply module powers on a DC-DC converter and a hybrid power controller, sending a pre-charging starting instruction to the DC-DC converter, and controlling the DC-DC converter to enter a pre-charging starting mode so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter;
determining that the pre-charging is complete;
controlling a high-voltage energy storage module to deliver high-voltage electricity to the capacitive load;
entering a pre-charge start mode according to a pre-charge start command from the hybrid controller to pre-charge the capacitive load;
the entering of the pre-charging starting mode according to the pre-charging starting command from the hybrid power controller comprises the following steps:
when the DC-DC converter is determined to enter a pre-charging starting mode, setting step voltage and step total duration time according to a high-voltage network equivalent circuit model;
chopping the voltage input by the low-voltage power supply module according to a closed-loop control signal, and outputting a pre-charging voltage according to the step voltage and the total step duration time so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter.
2. The hybrid vehicle high voltage power-on method according to claim 1, wherein the determining that the pre-charging is completed comprises:
receiving a charging feedback signal returned by the high-voltage network;
judging whether the pre-charging is finished or not according to the charging feedback signal;
if so, sending a low-power-consumption operation instruction to the DC-DC converter to control the DC-DC converter to enter a low-power-consumption operation mode;
if not, controlling the counting of the first counter to increase by 1;
judging whether the count value of the first counter reaches a first threshold value;
if yes, sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode;
if not, returning to execute the step of judging whether the pre-charging is finished according to the charging feedback signal.
3. The hybrid electric vehicle high-voltage power-on method according to claim 1, wherein the high-voltage energy storage module comprises a power switch, when the power switch is closed, the high-voltage energy storage module delivers high voltage to the capacitive load, and the controlling the high-voltage energy storage module delivers high voltage to the capacitive load comprises:
sending a closing signal to the power switch to control the power switch to close;
judging whether the power switch is closed or not according to a switch feedback signal sent by the high-voltage energy storage module;
if not, controlling the counting of the second counter to increase by 1;
judging whether the count value of the second counter reaches a second threshold value;
if yes, sending a fault diagnosis instruction to the DC-DC converter to control the DC-DC converter to enter a fault diagnosis mode;
if not, returning to the step of judging whether the power switch is closed according to a switch feedback signal sent by the power switch.
4. The high-voltage power-on method for the hybrid electric vehicle according to claim 1, further comprising:
entering a low-power-consumption operation mode according to a low-power-consumption operation instruction from the hybrid controller;
and entering a fault diagnosis mode according to a fault diagnosis command from the hybrid controller.
5. The high-voltage power-on method for the hybrid electric vehicle according to claim 1, characterized by further comprising the following steps after the chopping of the voltage input by the low-voltage power supply module according to the closed-loop control signal:
judging whether the output pre-charging voltage is equal to the step voltage or not;
if yes, waiting for a low-power-consumption operation instruction of the hybrid power controller;
if not, controlling the counting of the third counter to increase by 1;
judging whether the count value of the third counter reaches a third threshold value;
if yes, entering a fault diagnosis mode;
if not, returning to the step of judging whether the output pre-charging voltage is equal to the step voltage or not.
6. The utility model provides a hybrid vehicle high pressure power-on device which characterized in that, is applied to hybrid controller, includes:
the pre-charging starting instruction sending module is used for sending a pre-charging starting instruction to the DC-DC converter after the low-voltage power supply module powers on the DC-DC converter and the hybrid power controller, and controlling the DC-DC converter to enter a pre-charging starting mode so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter;
a determination module to determine that the pre-charging is complete;
the high-voltage transmission control module is used for controlling the high-voltage energy storage module to transmit high voltage to the capacitive load;
the mode switching module is used for entering a pre-charging starting mode according to a pre-charging starting command from the hybrid power controller so as to pre-charge the capacitive load;
a mode switching module comprising:
the step voltage setting unit is used for setting step voltage and step total duration time according to the high-voltage network equivalent circuit model when the DC-DC converter is determined to enter a pre-charging starting mode;
and the chopping output unit is used for chopping the voltage input by the low-voltage power supply module according to a closed-loop control signal and outputting a pre-charging voltage according to the step voltage and the step total duration so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter.
7. A high-voltage power-on system of a hybrid electric vehicle is characterized by comprising: the system comprises a hybrid power controller, a low-voltage power supply module, a high-voltage energy storage module, a DC-DC converter and a capacitive load;
the low-voltage power supply module is respectively connected with the DC-DC converter and the hybrid power controller and is used for supplying power to the DC-DC converter and the hybrid power controller;
the hybrid power controller is respectively connected with the control end of the DC-DC converter, the control end of the high-voltage energy storage module and the control end of the capacitive load;
the output end of the DC-DC converter and the output end of the high-voltage energy storage module are both connected with the capacitive load;
after the DC-DC converter and the hybrid power controller are powered on, the hybrid power controller sends a pre-charging starting command to the DC-DC converter and controls the DC-DC converter to enter a pre-charging starting mode so that the low-voltage power supply module pre-charges a capacitive load through the converter;
when the DC-DC converter is determined to enter a pre-charging starting mode, setting step voltage and step total duration time according to a high-voltage network equivalent circuit model;
chopping the voltage input by the low-voltage power supply module according to a closed-loop control signal, and outputting a pre-charging voltage according to the step voltage and the step total duration so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter;
after the DC-DC converter and the hybrid power controller are powered on, the hybrid power controller sends a pre-charging starting instruction to the DC-DC converter and controls the DC-DC converter to enter a pre-charging starting mode so that the low-voltage power supply module pre-charges a capacitive load through the DC-DC converter;
after the pre-charging is completed, the hybrid power controller sends an opening instruction to the high-voltage energy storage module to control the power switch of the high-voltage energy storage module to be closed, so that the high-voltage energy storage module transmits high voltage to the capacitive load.
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CN108215918A (en) * 2018-02-01 2018-06-29 武汉斯马特益电子技术有限公司 A kind of new-energy automobile high-pressure system circuit
CN108275001A (en) * 2018-02-01 2018-07-13 武汉斯马特益电子技术有限公司 A kind of vehicle high voltage system circuit of not pre-charge-relay
CN109398152A (en) * 2018-11-01 2019-03-01 芜湖奇达动力电池系统有限公司 Plug-in hybrid-power automobile battery system high pressure preliminary filling control method

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