CN110962608A - Voltage control method and system for hybrid electric vehicle - Google Patents
Voltage control method and system for hybrid electric vehicle Download PDFInfo
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- CN110962608A CN110962608A CN201911360916.7A CN201911360916A CN110962608A CN 110962608 A CN110962608 A CN 110962608A CN 201911360916 A CN201911360916 A CN 201911360916A CN 110962608 A CN110962608 A CN 110962608A
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- 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
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- 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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention discloses a voltage control method of a hybrid electric vehicle, which comprises the following steps of entering a voltage control mode when a high-voltage power supply system fails; detecting actual voltage at two ends of a capacitor in a motor controller in a voltage control mode, namely first voltage; acquiring the lowest voltage, namely a third voltage, of the converter working in a voltage reduction mode in a voltage control mode; comparing the first voltage with the third voltage; when the first voltage is greater than or equal to the third voltage, controlling the converter to enter a buck mode; in the voltage reduction mode, the first voltage is controlled by taking the second voltage as a target, and the second voltage is the target voltage of the capacitor when the motor controller can realize the voltage control mode; and when the first voltage is less than the third voltage, controlling the converter to enter a boost mode to boost the first voltage. When the high-voltage power supply system fails and the electric quantity of the capacitor is consumed, the first voltage is increased to the third voltage through the boosting of the converter, the realization of a voltage control mode is ensured, and the stability of the voltage power supply system is ensured.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to a voltage control method and system for a hybrid electric vehicle.
Background
Hybrid vehicles, i.e. vehicles powered by a plurality of systems, are generally known as gasoline-electric hybrid, i.e. vehicles powered by gasoline internal combustion engine and electric motor, consuming gasoline and electric energy, respectively.
On a hybrid/plug-in hybrid vehicle, a motor controller controls a motor to realize two tasks of driving assistance and generating power. For a low-voltage power supply system, a 12V storage battery is charged, a generator of an original traditional vehicle is omitted from a hybrid electric vehicle, a converter for converting high-voltage direct current (DCDC) output by a high-voltage battery pack or high-voltage electricity generated by the motor into low-voltage electricity is changed, and the 12V storage battery is charged.
Under the condition that a power supply system of the high-voltage battery pack fails and cannot supply electric energy, the motor controller controls the motor to work in a voltage control mode in order to ensure the stability of low-voltage power supply. Under the voltage control mode, the motor is in the power generation state, provides stable output voltage, provides stable high-voltage electric energy for DCDC's input to satisfy whole car low pressure power consumption demand. However, in the current technical state, there is a technical defect that the motor controller controls the motor to implement the voltage control mode, which is required to be entered when the DC-Link capacitor is fully charged, and when the DC-Link capacitor is not charged, there is no way to implement the voltage control mode successfully, and sufficient electric quantity cannot be generated to meet the requirement. That is to say, the voltage control mode is that under the condition that the high-voltage battery can still supply power normally, the voltage control mode is entered first, and then the high-voltage battery can be allowed to be disconnected, so that the voltage control mode can be realized. And for the condition that the high-voltage battery is disconnected and the electric quantity in the DC-Link capacitor is consumed, and the motor controller is required to enter a voltage control mode, the motor controller cannot realize the voltage control mode.
Disclosure of Invention
The invention aims to provide a voltage control method and a voltage control system for a hybrid electric vehicle, which solve the technical problem that a voltage control mode cannot be realized under the condition that a high-voltage power supply system fails and a capacitor does not have electricity.
In order to solve the technical problem, the invention provides a voltage control method for a hybrid electric vehicle, which comprises the following steps:
detecting whether a high-voltage power supply system fails; when a high-voltage power supply system fails, entering a voltage control mode; acquiring a first voltage of a capacitor in the motor controller in the voltage control mode, wherein the first voltage is an actual voltage at two ends of the capacitor; acquiring a third voltage of the converter in the voltage control mode, wherein the third voltage is the lowest voltage of the converter working in the voltage reduction mode; comparing the first voltage to the third voltage; controlling the converter to enter the buck mode when the first voltage is greater than or equal to the third voltage; in the process of entering the voltage reduction mode, controlling the first voltage by taking a second voltage as a target, wherein the second voltage is a target voltage of a capacitor when a motor controller can realize a voltage control mode; when the first voltage is smaller than the third voltage, the converter is controlled to enter a boost mode to boost the first voltage.
Further, the controlling the first voltage with a second voltage as a target in the process of entering the step-down mode includes: the motor controller performs closed-loop control based on the first voltage and the second voltage, and controls the first voltage with the second voltage as a target.
Further, when the first voltage is less than the third voltage, controlling the converter to enter a boost mode to boost the first voltage further comprises: in the boost mode, boosting the first voltage; when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode.
Further, when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode, and then the method further includes: the first voltage is controlled with the second voltage as a target.
Further, when the high-voltage power supply system is not in fault, the motor controller responds to the mode requirement of the vehicle control unit, and the DCDC converter responds to the mode requirement of the vehicle control unit.
Correspondingly, the invention also provides a voltage control system of the hybrid electric vehicle, which comprises a vehicle control unit, a motor controller, a converter, a high-voltage power supply system and a low-voltage power supply system; the vehicle control unit is respectively connected with the motor controller and the converter, the high-voltage power supply system is connected with the converter through the motor controller, and the converter is used for converting high-voltage direct current into low-voltage direct current; wherein the content of the first and second substances,
the vehicle control unit is used for: detecting whether a high-voltage power supply system fails; when a high-voltage power supply system fails, entering a voltage control mode; acquiring a first voltage of a capacitor in the motor controller in the voltage control mode, wherein the first voltage is an actual voltage at two ends of the capacitor; acquiring a third voltage of the converter in the voltage control mode, wherein the third voltage is the lowest voltage of the converter working in the voltage reduction mode; comparing the first voltage to the third voltage; controlling the converter to enter the buck mode when the first voltage is greater than or equal to the third voltage; in the process of entering the voltage reduction mode, controlling the first voltage by taking a second voltage as a target, wherein the second voltage is a target voltage of a capacitor when a motor controller can realize a voltage control mode; when the first voltage is smaller than the third voltage, the converter is controlled to enter a boost mode to boost the first voltage.
Further, the controlling the first voltage with a second voltage as a target in the process of entering the step-down mode includes: the motor controller performs closed-loop control based on the first voltage and the second voltage, and controls the first voltage with the second voltage as a target.
Further, when the first voltage is less than the third voltage, controlling the converter to enter a boost mode to boost the first voltage further comprises: in the boost mode, boosting the first voltage; when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode.
Further, when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode, and then the method further includes: the first voltage is controlled with the second voltage as a target.
Further, when the high-voltage power supply system is not in fault, the motor controller responds to the mode requirement of the vehicle control unit, and the DCDC converter responds to the mode requirement of the vehicle control unit.
The implementation of the invention has the following beneficial effects:
before the high-voltage power supply system is disconnected or fails, if the high-voltage power supply system does not enter a voltage control mode in advance, the voltage control mode can be realized after the high-voltage power supply system is disconnected or fails, and under the condition that the electric quantity in the capacitor is consumed after the high-voltage power supply system is disconnected or fails, the actual voltage of the capacitor is increased to the lowest voltage which can be stably operated in a voltage reduction mode by the converter through the operation of the voltage boosting mode of the converter, so that the voltage control mode can be realized by the motor controller, and the stability of the voltage power supply system of the whole vehicle is ensured. In the voltage reduction process of the converter, closed-loop control is performed based on the first voltage and the second voltage, the fluctuation of the first voltage near the second voltage is controlled in real time, the stability of a low-voltage power supply system is guaranteed, and the stability of a voltage power supply system of the whole vehicle is guaranteed.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a hybrid electric vehicle implementing a voltage control mode of the present invention;
FIG. 2 is a flow chart of a method for implementing voltage control in a hybrid vehicle according to the present invention.
10. A high voltage power supply system; 20. a motor controller; 21. a DC-link capacitor; 30. a DCDC converter; 40. 12V storage battery.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
On a hybrid/plug-in hybrid electric vehicle, a motor controller controls a motor to realize two tasks of driving assistance and generating electricity. For charging a 12V battery in a low voltage power supply system, a conventional vehicle generally converts a high voltage direct current output by a high voltage battery pack or a high voltage generated by a motor into a low voltage power through a DCDC converter (direct current to direct current converter) to charge the 12V battery.
When the high-voltage battery pack power supply system breaks down, under the condition that electric energy cannot be supplied, the motor controller controls the motor to work in a voltage control mode, and in the voltage control mode, the motor is in a power generation state, stable output voltage is provided, stable high-voltage electric energy is provided for the input end of the DCDC converter, and therefore the requirement of low-voltage power utilization of the whole vehicle is met. However, if the DC-link capacitor in the motor controller is not charged, there is no way to enter the voltage control mode, in other words, the voltage control mode needs to enter the voltage control mode first to fully charge the DC-link capacitor under the condition that the high-voltage battery can still normally supply power, so as to allow the high-voltage battery to be disconnected; the motor controller cannot implement the voltage control mode in the case that the high voltage battery is disconnected and the amount of power in the DC-link capacitor is consumed.
For example, when a driver just gets on the vehicle, the system detects that the high-voltage battery is faulty, or the relay cannot be closed, in such a case, the DC-link capacitor (or called as a thin film capacitor) of the motor controller cannot be charged, and then the motor controller cannot implement the voltage control mode to supply power to the DCDC, and then the power supply of the low-voltage system cannot be guaranteed.
Aiming at the technical problem existing in the scene, the invention provides a new method for realizing a voltage control mode.
The details are described below by way of examples.
Example 1
The method for implementing the voltage control mode of the hybrid electric vehicle shown in fig. 1-2 is mainly applied to a 7DCTH novel hybrid electric vehicle (PHEV) and a Hybrid Electric Vehicle (HEV) model.
A schematic diagram of a hybrid electric vehicle for realizing a voltage control mode is shown in fig. 1, a high-voltage power supply system 10 supplies power to fully charge a DC-link capacitor 21, and the DC-link capacitor 21 realizes the voltage control mode in a fully charged state.
When the DC-link capacitor 21 is fully charged, the process of implementing the voltage control mode is as follows: the motor is in the power generation state, provides stable output voltage, provides stable high-voltage electric energy for the input of DCDC converter 30, and DCDC converter 30 converts high-voltage direct current into low-voltage direct current and charges for 12V battery to satisfy whole car low pressure power consumption demand.
The method provided by the invention specifically comprises the following steps:
s100, detecting whether a high-voltage power supply system fails;
and when the high-voltage power supply system is not in fault, executing S300 that the motor controller responds to the mode requirement of the vehicle control unit and the DCDC converter responds to the mode requirement of the vehicle control unit.
The high-voltage power supply system 10 supplies power to fully charge the DC-link capacitor 21, the high-voltage power supply system 10 is allowed to be disconnected when the DC-link capacitor 21 is in a fully charged state, high-voltage direct current generated by the motor is converted into low-voltage direct current through a DCDC converter 30 (direct current to direct current converter) to supply power to a low-voltage power supply system, and the low-voltage power supply system is a 12V storage battery 40.
When the high-voltage power supply system breaks down, a voltage control mode is realized. Namely, executing S200, and entering a voltage control mode when the high-voltage power supply system has a fault.
The motor controller controls the motor to work in a voltage control mode, and the method specifically comprises the following steps:
s210, acquiring a first voltage of a capacitor in the motor controller in a voltage control mode, wherein the first voltage is an actual voltage at two ends of the capacitor.
The capacitor is a DC-link capacitor.
Acquiring a third voltage of the DCDC converter 30 in the voltage control mode, where the third voltage is a lowest voltage of the DCDC converter working in the buck mode;
s220, comparing the first voltage with the third voltage.
And S230, when the first voltage is greater than or equal to the third voltage, controlling the converter to enter a buck mode.
When the first voltage is greater than or equal to the third voltage, it indicates the electric quantity stored in the capacitor, and the motor controller 20 can enter a voltage control mode, in the voltage control mode, the motor is in a power generation state, converts mechanical energy input by the engine into electric energy, provides a stable output voltage, provides a stable high-voltage electric energy for the input end of the DCDC, and at this time, controls the DCDC converter to enter a voltage reduction mode.
The high voltage dc generated by the motor controller is converted to low voltage dc by a DCDC converter 30 (dc to dc converter) to supply power to the low voltage power supply system. The low voltage power supply system is a 12V battery 40.
In the application, the voltage reduction mode of the DCDC converter converts high-voltage direct current into low-voltage direct current, and charges a low-voltage power supply system (12V storage battery 40).
During the buck mode of S230, the capacitor consumes power. At this time, it is necessary to execute S230, in the process of entering the step-down mode, to control the first voltage with a second voltage as a target, where the second voltage is a target voltage of a capacitor when the motor controller can implement the voltage control mode.
In the process of the voltage reduction mode, the motor controller works in the voltage mode to control the motor to generate electricity to realize timely supplement of the electric quantity, and the first voltage is controlled to fluctuate near the second voltage in real time through S230.
The specific process of S230 comprises:
s231, the motor controller performs closed-loop control based on the first voltage and the second voltage, and controls the first voltage by taking the second voltage as a target.
Closed loop control refers to a control relationship in which the output being controlled is returned to the input being controlled in a manner that exerts a controlling influence on the input. And (3) a system control mode with feedback information. When the operator starts the system, the control information is transmitted to the controlled object through the system operation, and the state information of the controlled object is fed back to the input to correct the operation process, so that the output of the system meets the expected requirement. The closed-loop control is a control mode with flexibility and high work performance.
And through the closed-loop control of the first voltage and the second voltage, the first voltage is controlled to fluctuate near the second voltage in real time.
And S240, when the first voltage is smaller than the third voltage, controlling the DCDC converter to enter a boost mode to boost the first voltage.
When the first voltage is lower than the third voltage, which indicates that the amount of electricity stored in the capacitor is insufficient to enable the motor controller 20 to enter the voltage control mode, the motor controller is controlled to enter a preparation state before the power generation mode, and the DCDC converter is controlled to enter the boost mode.
In the boost mode, the low-voltage electricity of the low-voltage power supply system (i.e. 12V battery) is converted into the high-voltage electricity, so that the actual voltage across the DC-link capacitor 21 is increased to reach a first voltage greater than or equal to a third voltage.
In a boost mode, boosting a first voltage;
and when the first voltage is greater than or equal to the third voltage, controlling the DCDC converter to enter a buck mode.
In the application, the voltage reduction mode of the DCDC converter is that low-voltage direct current of the 12V storage battery 40 is converted into high-voltage direct current, and the DC-link capacitor 21 is charged.
When the first voltage is less than the third voltage, it is indicative that there is insufficient charge in the capacitor to enable the motor controller 20 to enter the voltage control mode. At this time, if the motor controller enters the voltage control module, the motor controller will fail. That is, the motor controller cannot generate enough electric quantity to satisfy the requirement that the DCDC converter enters the step-down mode, and thus cannot generate enough supply of low-voltage electric quantity, so that the motor controller needs to be controlled to enter a preparation state before entering the power generation mode, at this time, the DCDC converter is controlled to enter the step-up mode, part of electric quantity of the low-voltage power supply system (namely, the 12V storage battery 40) is converted into high-voltage electric quantity, actual voltage (namely, first voltage) at two ends of the capacitor is increased to reach a state that the first voltage is greater than or equal to a third voltage, so that the converter is controlled to enter the step-down mode, namely, the step-up step S230 is performed, the voltage control mode is successfully entered, the DCDC converter 30 is made to work in the step-down mode.
And when the first voltage is greater than or equal to the third voltage, controlling the DCDC converter to enter a step-down mode, and then controlling the first voltage in real time by taking the second voltage as a target, wherein the first voltage is controlled to fluctuate near the second voltage in real time. Specifically, the motor controller performs closed-loop control based on the first voltage and the second voltage, controls the first voltage in real time with the second voltage as a target, and controls the first voltage to fluctuate near the second voltage in real time.
In the traditional voltage control mode, the voltage control mode needs to be entered in advance before the high-voltage power supply system is disconnected or fails, so that the stability of the voltage power supply system of the whole vehicle can be ensured.
Before the high-voltage power supply system is disconnected or fails, if the high-voltage power supply system does not enter the voltage control mode in advance, the voltage control mode can be realized after the high-voltage power supply system is disconnected or fails.
And after the high-voltage power supply system is disconnected or failed, under the condition that the electric quantity in the DC-link capacitor 21 is consumed, that is, under the condition that the electric quantity in the DC-link capacitor 21 passing through the converter is not enough to support the motor controller to enter the voltage control mode, the DCDC converter firstly enters the boost mode to work, the actual voltage (first voltage) of the DC-link capacitor 21 is increased to the lowest voltage (third voltage) at which the converter can stably work in the buck mode, and the motor controller 20 is ensured to realize the voltage control mode, so that the stability of the voltage power supply system of the whole vehicle is ensured. In the voltage reduction process of the DCDC converter, closed-loop control is performed based on the first voltage and the second voltage, the fluctuation of the first voltage near the second voltage is controlled in real time, and the stability of a low-voltage power supply system (12V storage battery) is ensured, so that the stability of the voltage power supply system of the whole vehicle is ensured.
Example 2
A system for realizing a voltage control mode of a hybrid electric vehicle is mainly applied to a novel 7DCTH hybrid electric vehicle (PHEV) and a Hybrid Electric Vehicle (HEV) model.
A schematic diagram of a hybrid electric vehicle for realizing a voltage control mode is shown in fig. 1, a high-voltage power supply system 10 supplies power to fully charge a DC-link capacitor 21, and the DC-link capacitor 21 realizes the voltage control mode in a fully charged state.
When the DC-link capacitor 21 is fully charged, the process of implementing the voltage control mode is as follows: the motor is in the power generation state, provides stable output voltage, provides stable high-voltage electric energy for the input of DCDC converter 30, and DCDC converter 30 converts high-voltage direct current into low-voltage direct current and charges for 12V battery to satisfy whole car low pressure power consumption demand.
The schematic diagram of the voltage control mode of the hybrid electric vehicle is shown in fig. 1, and the system for realizing the voltage control mode of the hybrid electric vehicle provided by the invention specifically comprises: the system comprises a vehicle control unit, a motor controller, a converter, a high-voltage power supply system and a low-voltage power supply system; the vehicle control unit is respectively connected with the motor controller and the converter, the high-voltage power supply system is connected with the converter through the motor controller, and the converter is used for switching between high-voltage direct current and low-voltage direct current.
Wherein the content of the first and second substances,
the vehicle control unit is used for: s100 is performed to detect whether the high voltage power supply system fails.
And when the high-voltage power supply system is not in fault, executing S300 that the motor controller responds to the mode requirement of the vehicle control unit and the DCDC converter responds to the mode requirement of the vehicle control unit.
The high-voltage power supply system 10 supplies power to fully charge the DC-link capacitor 21, the high-voltage power supply system 10 is allowed to be disconnected when the DC-link capacitor 21 is in a fully charged state, high-voltage direct current generated by the motor is converted into low-voltage direct current through a DCDC converter 30 (direct current to direct current converter) to supply power to a low-voltage power supply system, and the low-voltage power supply system is a 12V storage battery 40.
When the high-voltage power supply system breaks down, a voltage control mode is realized. Namely, executing S200, and entering a voltage control mode when the high-voltage power supply system has a fault.
The motor controller controls the motor to work in a voltage control mode, and the method specifically comprises the following steps:
s210, acquiring a first voltage of a capacitor in the motor controller in the voltage control mode, wherein the first voltage is an actual voltage at two ends of the capacitor; the capacitor is a DC-link capacitor.
Acquiring a third voltage of the converter in the voltage control mode, wherein the third voltage is the lowest voltage of the converter working in the voltage reduction mode;
s220, comparing the first voltage with the third voltage;
and S230, when the first voltage is greater than or equal to the third voltage, controlling the converter to enter the buck mode.
When the first voltage is greater than or equal to the third voltage, it indicates the electric quantity stored in the capacitor, and the motor controller 20 can enter a voltage control mode, in the voltage control mode, the motor is in a power generation state, converts mechanical energy input by the engine into electric energy, provides a stable output voltage, provides a stable high-voltage electric energy for the input end of the DCDC, and at this time, controls the DCDC converter to enter a voltage reduction mode.
The high voltage dc generated by the motor controller is converted to low voltage dc by a DCDC converter 30 (dc to dc converter) to supply power to the low voltage power supply system. The low voltage power supply system is a 12V battery 40.
In the application, the voltage reduction mode of the DCDC converter converts high-voltage direct current into low-voltage direct current, and charges a low-voltage power supply system (12V storage battery 40).
During the buck mode of S230, the capacitor consumes power. At this time, it is necessary to execute S230, in the process of entering the step-down mode, to control the first voltage with a second voltage as a target, where the second voltage is a target voltage of a capacitor when the motor controller can implement the voltage control mode.
In the process of the voltage reduction mode, the motor controller works in the voltage mode to control the motor to generate electricity to realize timely supplement of the electric quantity, and the first voltage is controlled to fluctuate near the second voltage in real time through S230.
The specific process of S230 comprises:
s231, the motor controller performs closed-loop control based on the first voltage and the second voltage, and controls the first voltage by taking the second voltage as a target.
Closed loop control refers to a control relationship in which the output being controlled is returned to the input being controlled in a manner that exerts a controlling influence on the input. And (3) a system control mode with feedback information. When the operator starts the system, the control information is transmitted to the controlled object through the system operation, and the state information of the controlled object is fed back to the input to correct the operation process, so that the output of the system meets the expected requirement. The closed-loop control is a control mode with flexibility and high work performance.
And through the closed-loop control of the first voltage and the second voltage, the first voltage is controlled to fluctuate near the second voltage in real time.
And S240, when the first voltage is smaller than the third voltage, controlling the converter to enter a boost mode to boost the first voltage.
When the first voltage is lower than the third voltage, which indicates that the amount of electricity stored in the capacitor is insufficient to enable the motor controller 20 to enter the voltage control mode, the motor controller is controlled to enter a preparation state before the power generation mode, and the DCDC converter is controlled to enter the boost mode.
In the boost mode, the low-voltage electricity of the low-voltage power supply system (i.e. 12V battery) is converted into the high-voltage electricity, so that the actual voltage across the DC-link capacitor 21 is increased to reach a first voltage greater than or equal to a third voltage.
When the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode.
In the application, the voltage reduction mode of the DCDC converter is that low-voltage direct current of the 12V storage battery 40 is converted into high-voltage direct current, and the DC-link capacitor 21 is charged.
When the first voltage is less than the third voltage, it is indicative that there is insufficient charge in the capacitor to enable the motor controller 20 to enter the voltage control mode. At this time, if the motor controller enters the voltage control module, the motor controller will fail. That is, the motor controller cannot generate enough electric quantity to satisfy the requirement that the DCDC converter enters the step-down mode, and thus cannot generate enough supply of low-voltage electric quantity, so that the motor controller needs to be controlled to enter a preparation state before entering the power generation mode, at this time, the DCDC converter is controlled to enter the step-up mode, part of electric quantity of the low-voltage power supply system (namely, the 12V storage battery 40) is converted into high-voltage electric quantity, actual voltage (namely, first voltage) at two ends of the capacitor is increased to reach a state that the first voltage is greater than or equal to a third voltage, so that the converter is controlled to enter the step-down mode, namely, the step-up step S230 is performed, the voltage control mode is successfully entered, the DCDC converter 30 is made to work in the step-down mode.
And when the first voltage is greater than or equal to the third voltage, controlling the DCDC converter to enter a step-down mode, and then controlling the first voltage by taking the second voltage as a target.
Specifically, the motor controller performs closed-loop control based on the first voltage and the second voltage, controls the first voltage in real time with the second voltage as a target, and controls the first voltage to fluctuate near the second voltage in real time.
In the traditional voltage control mode, the voltage control mode needs to be entered in advance before the high-voltage power supply system is disconnected or fails, so that the stability of the voltage power supply system of the whole vehicle can be ensured.
Before the high-voltage power supply system is disconnected or fails, if the high-voltage power supply system does not enter the voltage control mode in advance, the voltage control mode can be realized after the high-voltage power supply system is disconnected or fails.
And after the high-voltage power supply system is disconnected or failed, under the condition that the electric quantity in the DC-link capacitor 21 is consumed, that is, under the condition that the electric quantity in the DC-link capacitor 21 passing through the converter is not enough to support the motor controller to enter the voltage control mode, the DCDC converter firstly enters the boost mode to work, the actual voltage (first voltage) of the DC-link capacitor 21 is increased to the lowest voltage (third voltage) at which the converter can stably work in the buck mode, and the motor controller 20 is ensured to realize the voltage control mode, so that the stability of the voltage power supply system of the whole vehicle is ensured. In the voltage reduction process of the DCDC converter, closed-loop control is performed based on the first voltage and the second voltage, the fluctuation of the first voltage near the second voltage is controlled in real time, and the stability of a low-voltage power supply system (12V storage battery) is ensured, so that the stability of the voltage power supply system of the whole vehicle is ensured.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The antiskid control system provided by the embodiment of the invention has the same implementation principle and technical effect as the method embodiment, and for the sake of brief description, the corresponding content in the method embodiment can be referred to where the device embodiment is not mentioned.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the above claims.
Claims (10)
1. A method of voltage control for a hybrid vehicle, comprising:
detecting whether a high-voltage power supply system fails;
when a high-voltage power supply system fails, entering a voltage control mode;
acquiring a first voltage of a capacitor in the motor controller in the voltage control mode, wherein the first voltage is an actual voltage at two ends of the capacitor;
acquiring a third voltage of the converter in the voltage control mode, wherein the third voltage is the lowest voltage of the converter working in the voltage reduction mode;
comparing the first voltage to the third voltage;
controlling the converter to enter the buck mode when the first voltage is greater than or equal to the third voltage;
in the process of entering the voltage reduction mode, controlling the first voltage by taking a second voltage as a target, wherein the second voltage is a target voltage of a capacitor when a motor controller can realize a voltage control mode;
when the first voltage is smaller than the third voltage, the converter is controlled to enter a boost mode to boost the first voltage.
2. The method of voltage control of a hybrid vehicle according to claim 1, characterized in that: in the process of entering the step-down mode, controlling the first voltage with a second voltage as a target includes:
the motor controller performs closed-loop control based on the first voltage and the second voltage, and controls the first voltage with the second voltage as a target.
3. The method of voltage control of a hybrid vehicle according to claim 2, characterized in that: when the first voltage is less than the third voltage, controlling the converter to enter a boost mode to boost the first voltage, further comprising:
in the boost mode, boosting the first voltage;
when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode.
4. The method of voltage control of a hybrid vehicle according to claim 3, characterized in that: when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode, and then the method further comprises:
the first voltage is controlled with the second voltage as a target.
5. The method of voltage control of a hybrid vehicle according to claim 1, characterized in that:
when the high-voltage power supply system is not in fault, the motor controller responds to the mode requirement of the vehicle control unit, and the DCDC converter responds to the mode requirement of the vehicle control unit.
6. A system for voltage control of a hybrid electric vehicle is characterized in that: the system comprises a vehicle control unit, a motor controller, a converter, a high-voltage power supply system and a low-voltage power supply system; the vehicle control unit is respectively connected with the motor controller and the converter, the high-voltage power supply system is connected with the converter through the motor controller, and the converter is used for converting high-voltage direct current into low-voltage direct current; wherein the content of the first and second substances,
the vehicle control unit is used for: detecting whether a high-voltage power supply system fails; when a high-voltage power supply system fails, entering a voltage control mode; acquiring a first voltage of a capacitor in the motor controller in the voltage control mode, wherein the first voltage is an actual voltage at two ends of the capacitor; acquiring a third voltage of the converter in the voltage control mode, wherein the third voltage is the lowest voltage of the converter working in the voltage reduction mode; comparing the first voltage to the third voltage; controlling the converter to enter the buck mode when the first voltage is greater than or equal to the third voltage; in the process of entering the voltage reduction mode, controlling the first voltage by taking a second voltage as a target, wherein the second voltage is a target voltage of a capacitor when a motor controller can realize a voltage control mode; when the first voltage is smaller than the third voltage, the converter is controlled to enter a boost mode to boost the first voltage.
7. The system for voltage control of a hybrid vehicle according to claim 6, characterized in that: in the process of entering the step-down mode, controlling the first voltage with a second voltage as a target includes:
the motor controller performs closed-loop control based on the first voltage and the second voltage, and controls the first voltage with the second voltage as a target.
8. The system for voltage control of a hybrid vehicle according to claim 7, characterized in that: when the first voltage is less than the third voltage, controlling the converter to enter a boost mode to boost the first voltage, further comprising:
in the boost mode, boosting the first voltage;
when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode.
9. The system for voltage control of a hybrid vehicle according to claim 8, characterized in that: when the first voltage is greater than or equal to a third voltage, the converter is controlled to enter a buck mode, and then the method further comprises:
the first voltage is controlled with the second voltage as a target.
10. The system for voltage control of a hybrid vehicle according to claim 5, characterized in that: when the high-voltage power supply system is not in fault, the motor controller responds to the mode requirement of the vehicle control unit, and the DCDC converter responds to the mode requirement of the vehicle control unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022011514A1 (en) * | 2020-07-13 | 2022-01-20 | 威睿电动汽车技术(宁波)有限公司 | Generator control method and apparatus, electronic device, and storage medium |
| CN114655019A (en) * | 2022-05-10 | 2022-06-24 | 宁德时代新能源科技股份有限公司 | Fault detection method, device and equipment for motor power device and storage medium |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425575A (en) * | 2001-12-12 | 2003-06-25 | 本田技研工业株式会社 | Composite power vehicle and its control method |
| FR2877162A1 (en) * | 2004-10-25 | 2006-04-28 | Renault Sas | Switched reluctance machine controlling device for hybrid vehicle, has control unit for controlling switched reluctance machine on any range of speed of machine in DC current mode such that current in each winding remains in non-null value |
| CN1785707A (en) * | 2005-12-09 | 2006-06-14 | 清华大学 | Fuel battery automobile mixed power system using super capacity as auxiliary power device |
| JP2007318849A (en) * | 2006-05-24 | 2007-12-06 | Toyota Motor Corp | Electric system of electric automobile |
| CN101237154A (en) * | 2008-02-01 | 2008-08-06 | 清华大学 | Dynamics battery-super capacitance mixed dynamic system for electric car |
| CN101570181A (en) * | 2009-06-03 | 2009-11-04 | 奇瑞汽车股份有限公司 | Hybrid vehicle battery fault management system and management method thereof |
| CN101938243A (en) * | 2010-08-31 | 2011-01-05 | 重庆长安汽车股份有限公司 | Voltage closed loop control method of ISG motor for hybrid electric vehicle |
| CN102035445A (en) * | 2009-09-27 | 2011-04-27 | 天津市松正电动科技有限公司 | High-speed weak magnetic closed loop control method for permanent magnetic synchronous motor |
| CN102700427A (en) * | 2012-06-01 | 2012-10-03 | 武汉理工大学 | Vehicle-mounted fuel cell and storage cell directly paralleled power system with super capacitor |
| CN203819054U (en) * | 2014-03-25 | 2014-09-10 | 潍柴动力股份有限公司 | Precharging circuit of motor controller |
-
2019
- 2019-12-25 CN CN201911360916.7A patent/CN110962608B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1425575A (en) * | 2001-12-12 | 2003-06-25 | 本田技研工业株式会社 | Composite power vehicle and its control method |
| FR2877162A1 (en) * | 2004-10-25 | 2006-04-28 | Renault Sas | Switched reluctance machine controlling device for hybrid vehicle, has control unit for controlling switched reluctance machine on any range of speed of machine in DC current mode such that current in each winding remains in non-null value |
| CN1785707A (en) * | 2005-12-09 | 2006-06-14 | 清华大学 | Fuel battery automobile mixed power system using super capacity as auxiliary power device |
| JP2007318849A (en) * | 2006-05-24 | 2007-12-06 | Toyota Motor Corp | Electric system of electric automobile |
| CN101237154A (en) * | 2008-02-01 | 2008-08-06 | 清华大学 | Dynamics battery-super capacitance mixed dynamic system for electric car |
| CN101570181A (en) * | 2009-06-03 | 2009-11-04 | 奇瑞汽车股份有限公司 | Hybrid vehicle battery fault management system and management method thereof |
| CN102035445A (en) * | 2009-09-27 | 2011-04-27 | 天津市松正电动科技有限公司 | High-speed weak magnetic closed loop control method for permanent magnetic synchronous motor |
| CN101938243A (en) * | 2010-08-31 | 2011-01-05 | 重庆长安汽车股份有限公司 | Voltage closed loop control method of ISG motor for hybrid electric vehicle |
| CN102700427A (en) * | 2012-06-01 | 2012-10-03 | 武汉理工大学 | Vehicle-mounted fuel cell and storage cell directly paralleled power system with super capacitor |
| CN203819054U (en) * | 2014-03-25 | 2014-09-10 | 潍柴动力股份有限公司 | Precharging circuit of motor controller |
Non-Patent Citations (2)
| Title |
|---|
| LI,SHUQIU等: "A Research and Implementation of On-Vehicle Detection System of Hybrid Electric Vehicle", 《A RESEARCH AND IMPLEMENTATION OF ON-VEHICLE DETECTION SYSTEM OF HYBRID ELECTRIC VEHICLE》 * |
| 陈平: "燃料电池插电式混合动力轿车关键技术研究", 《燃料电池插电式混合动力轿车关键技术研究》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022011514A1 (en) * | 2020-07-13 | 2022-01-20 | 威睿电动汽车技术(宁波)有限公司 | Generator control method and apparatus, electronic device, and storage medium |
| CN114655019A (en) * | 2022-05-10 | 2022-06-24 | 宁德时代新能源科技股份有限公司 | Fault detection method, device and equipment for motor power device and storage medium |
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|---|---|
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