CN113098261A - Control method of adjustable high-power DC/DC converter of hybrid electric vehicle - Google Patents

Control method of adjustable high-power DC/DC converter of hybrid electric vehicle Download PDF

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CN113098261A
CN113098261A CN202110367290.3A CN202110367290A CN113098261A CN 113098261 A CN113098261 A CN 113098261A CN 202110367290 A CN202110367290 A CN 202110367290A CN 113098261 A CN113098261 A CN 113098261A
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converter
path
module
power
output power
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陈静
肖纯
田韶鹏
蓝贤宝
张猛
张亦弛
喻茂昌
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Foshan Xianhu Laboratory
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Foshan Xianhu Laboratory
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • 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
    • B60R16/023—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 for transmission of signals between vehicle parts or subsystems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a control method for an adjustable high-power DC/DC converter of a hybrid electric vehicle, which is realized by a power supply, the DC/DC converter, a PWM driver and a control system, wherein the DC/DC converter comprises a plurality of parallel DC/DC conversion sub-modules; the control system comprises a main controller, a PWM (pulse-width modulation) wave controller, a current sampling module and a voltage sampling module, wherein the main controller is communicated with the whole vehicle controller to obtain target output power of the DC/DC converter and determine the working mode of the DC/DC converter so as to determine PWM wave control signals; the PWM wave controller determines a PWM control signal according to the working mode and the PWM wave control signal; the PWM driver adjusts the output power of at least one path of DC/DC conversion submodule according to the PWM control signal; until the output power of the DC/DC converter is equal to the target power. The output power real-time performance of the invention is guaranteed.

Description

Control method of adjustable high-power DC/DC converter of hybrid electric vehicle
The invention belongs to the technical field of new energy automobiles, and particularly relates to a control method of an adjustable high-power DC/DC converter of a hybrid electric vehicle.
Background
In a hybrid vehicle using a hydrogen fuel cell and a lithium battery as a power source, the output characteristics of the fuel cell are soft, and it is difficult to directly drive a vehicle motor, and it is generally necessary to improve the dynamic performance thereof by a direct current-direct current (DC/DC) converter. In the existing hybrid electric vehicle, the peak power of the motor reaches dozens of kilowatts, and the power required by the DC/DC converter also reaches dozens of kilowatts correspondingly. Therefore, the inventor invents an adjustable high-power DC/DC converter (202011434742.7) for a hybrid electric vehicle, most of the existing control methods of the DC/DC converter aim at the control of a single-path DC/DC converter, and the control requirements of the adjustable high-power DC/DC converter for the hybrid electric vehicle cannot be met.
In view of the above problems, a control method for an adjustable high-power DC/DC converter of a hybrid electric vehicle is provided.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a control method of an adjustable high-power DC/DC converter of a hybrid electric vehicle, which meets the control requirement of the adjustable high-power DC/DC converter of the hybrid electric vehicle.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the invention provides a control method for an adjustable high-power DC/DC converter of a hybrid electric vehicle, which is realized by a power supply, the DC/DC converter, a PWM driver and a control system, wherein the DC/DC converter comprises a plurality of paths of DC/DC conversion sub-modules connected in parallel; the control system comprises a main controller and a PWM (pulse-width modulation) wave controller, wherein the main controller is connected with the PWM wave controller through a CAN (controller area network) bus, the PWM wave controller is connected with a PWM driver, and the PWM driver is connected with a DC/DC converter; the power supply consists of a hydrogen fuel cell system and a lithium battery.
The method comprises the following steps:
s101, the main controller communicates with a whole vehicle controller through a CAN bus to obtain target output power of a DC/DC converter;
s102, the main controller determines the working mode of the DC/DC converter according to the target output power and a switching control strategy;
s103, the current sampling module and the voltage sampling module respectively send the acquired output current and output voltage signals of the DC/DC converter to the main controller;
s104, the main controller determines a PWM wave control signal according to the output current of the DC/DC converter, the output voltage of the DC/DC converter and the target output power;
s105, the PWM wave controller determines a PWM control signal according to the working mode and the PWM wave control signal;
s106, the PWM driver adjusts the output power of at least one path of DC/DC conversion sub-module which is put into operation according to the PWM control signal;
and S107, repeating the steps S103 to S106 to realize the dynamic regulation of the output power of the DC/DC converter until the output power of the DC/DC converter is equal to the target power.
Further, the multiple paths of DC/DC conversion sub-modules are four paths of DC/DC conversion sub-modules, and are marked as a first path of DC/DC conversion sub-module, a second path of DC/DC conversion sub-module, a third path of DC/DC conversion sub-module and a fourth path of DC/DC conversion sub-module; the PWM driver comprises a first path of driving module, a second path of driving module, a third path of driving module and a fourth path of driving module; the first drive module is connected with the first DC/DC conversion submodule, the second drive module is connected with the second DC/DC conversion submodule, the third drive module is connected with the third DC/DC conversion submodule, and the fourth drive module is connected with the fourth DC/DC conversion submodule.
Further, the switching control strategy is as follows:
setting the rated power of a first path of DC/DC conversion submodule, a second path of DC/DC conversion submodule, a third path of DC/DC conversion submodule and a fourth path of DC/DC conversion submodule to be the same, and setting the rated power to be PeAccording to PeAnd target output power P0The operation mode is determined by either:
when the target output power P0Is in the size range of 0<P0≤PeWhen the direct current/direct current (DC/DC) converter works, the working mode of the DC/DC converter is a first working mode, wherein the first working mode refers to the actual output power P of the first path of DC/DC conversion submodule1Regulating and controlling to make the output power of the DC/DC converter equal to the target output power;
when the target output power P0Is in the size range of Pe<P0≤2PeWhen the power supply is in the second working mode, the working mode of the DC/DC converter is the second working mode, wherein the first working mode refers to that the output power of the first path of DC/DC conversion sub-module is the rated power P of the first path of DC/DC conversion sub-moduleeFor only the output power P of the second DC/DC conversion sub-module2Performing dynamic adjustment to make the output power of the DC/DC converter equal to the target output power;
when the target output power P0Is in the size range of 2Pe<P0≤3PeAnd the working mode of the DC/DC converter is a third working mode, wherein the third working mode refers to that the output power of the first path of DC/DC conversion sub-module and the output power of the second path of DC/DC conversion sub-module are both PeFor output power P of the third DC/DC conversion submodule only3The dynamic adjustment is performed so that the output power of the DC/DC converter is equal to the target output power.
When the target output power P0Is in the size range of 3Pe≤P0<4PeAnd the working mode of the DC/DC converter is a fourth working mode, wherein the fourth working mode refers to the first path of DC/DC conversion sub-module, the second path of DC/DC conversion sub-module and the third path of DC/DC conversion sub-moduleThe output power of the module is PeFor output power P of the fourth DC/DC conversion submodule only4The dynamic adjustment is performed so that the output power of the DC/DC converter is equal to the target output power.
Further, the determining, by the main controller, the PWM wave control signal according to the output current of the DC/DC converter, the output voltage of the DC/DC converter, and the target output power includes:
(1) the main controller determines the actual output power Pt＝I0*UoIn which I0Is the output current of the DC/DC converter, UoIs the output voltage of the DC/DC converter;
(2) the main controller calculates the target output power P0And the actual output power PtPower deviation Δ P ═ P0-Pt；
(3) The main controller is based on the output current I of the DC/DC converter0Output voltage UoAnd power deviation delta P, and determining PWM wave control signal U by adopting voltage-current double closed-loop control strategyk。
Further, the determining, by the PWM wave controller, a PWM control signal according to the operation mode and the PWM wave control signal includes:
setting the output power of a first path of DC/DC conversion submodule, a second path of DC/DC conversion submodule, a third path of DC/DC conversion submodule and a fourth path of DC/DC conversion submodule as rated power PeThe control signals required are Ukm; the PWM control signals comprise Uk1, Uk2, Uk3 and Uk4, wherein Uk1, Uk2, Uk3 and Uk4 respectively form PWM1, PWM2, PWM3 and PWM3 through a first path of driving module, a second path of driving module, a third path of driving module and a fourth path of driving module, and respectively act on the first path of DC/DC conversion sub-module, the second path of DC/DC conversion sub-module, the third path of DC/DC conversion sub-module and the fourth path of DC/DC conversion sub-module;
when the DC/DC converter has a first operation mode, the PWM wave controller sets the values of Uk2, Uk3 and Uk4 to 0, and controls U according to the received PWM wavekGenerating an adjustable PWM control signal Uk1, i.e. Uk1 ═ Uk；
When DC/DC conversionThe operation mode of the device is a second operation mode, the PWM wave controller sets the values of Uk3 and Uk4 to 0, Uk1 to Ukm, and the control signal U is controlled according to the received PWM wavekGenerating an adjustable PWM control signal Uk2, i.e. Uk2 ═ Uk；
When the DC/DC converter has a third operation mode, the PWM wave controller sets the value of Uk4 to 0, sets both Uk1 and Uk2 to Ukm, and controls the U according to the received PWM wavekGenerating an adjustable PWM control signal Uk3, i.e. Uk3 ═ Uk；
When the working mode of the DC/DC converter is the fourth working mode, the PWM wave controller sets all Uk1, Uk2 and Uk3 to Ukm, and the PWM wave controller controls the U according to the received PWM wavekGenerating an adjustable PWM control signal Uk4, i.e. Uk4 ═ Uk。
Further, the output power of at least one path of DC/DC conversion sub-module regulated by the PWM driver according to the PWM control signal is specifically:
and the PWM driver respectively adjusts the output power of the first path of DC/DC conversion sub-module, the second path of DC/DC conversion sub-module, the third path of DC/DC conversion sub-module and the fourth path of DC/DC conversion sub-module according to the values of Uk1, Uk2, Uk3 and Uk 4.
Furthermore, the control method of the adjustable high-power DC/DC converter adopts a double-CPU control structure, the first CPU is a main controller, and the second CPU is a PWM wave controller, so that the stability of the output power and the output voltage of the adjustable high-power DC/DC converter is ensured.
The invention aims at the technical problems in the prior art, provides a control method of an adjustable high-power DC/DC converter of a hybrid electric vehicle, meets the control requirement of the adjustable high-power DC/DC converter of the hybrid electric vehicle, and can be applied to the output power regulation of the adjustable high-power DC/DC converter. The method mainly has the following advantages:
(1) the invention integrates a switching control strategy and a power regulation method, the switching control strategy can quickly determine the working mode of the DC/DC converter according to the required target power P0, and automatically regulates the output power of at least one path of DC/DC conversion submodule which is put into operation, so that the output power of the DC/DC converter quickly reaches the target power, and the output power real-time performance of the adjustable high-power DC/DC converter is ensured.
(2) The invention is suitable for the output power regulation of the adjustable high-power DC/DC converter, improves the regulation performance, and has strong real-time performance, large output power, stable voltage and small voltage ripple.
Drawings
Fig. 1 is a structural schematic diagram corresponding to a control method of an adjustable high-power DC/DC converter of a hybrid electric vehicle according to an embodiment of the present invention.
Fig. 2 is a flowchart of a control method of an adjustable high-power DC/DC converter of a hybrid electric vehicle according to an embodiment of the present invention.
Description of reference numerals: 1. a control system; 1-1. a main controller; 1-2, a PWM wave controller; 2. a vehicle control unit; 3. a current sampling module; 4. a voltage sampling module; 5, PWM driver; 5-1, a first path of driving module; 5-2, a second path of driving module; 5-3, a third path of driving module; 5-4, a fourth driving module; 6. a power source; a DC/DC converter; 7-1, a first path of DC/DC converter submodule; 7-2. a second path of DC/DC converter submodule; 7-3. a third path of DC/DC converter sub-module; and 7-4. a fourth path DC/DC converter sub-module.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the present invention is not limited thereto.
The invention integrates a switching control strategy and a power regulation method, the switching control strategy can quickly determine the working mode of the DC/DC converter according to the required target power P0, and the output power of at least one path of DC/DC conversion submodule which is put into operation is regulated, so that the output power of the DC/DC converter quickly reaches the target power, and the real-time performance of the output power of the adjustable high-power DC/DC converter is ensured.
The invention provides a control method for an adjustable high-power DC/DC converter of a hybrid electric vehicle, which is realized by a power supply, a DC/DC converter, a PWM driver and a control system, wherein the DC/DC converter comprises a plurality of paths of DC/DC conversion sub-modules connected in parallel; the control system comprises a main controller and a PWM (pulse-width modulation) wave controller, wherein the main controller is connected with the PWM wave controller through a CAN (controller area network) bus, the PWM wave controller is connected with a PWM driver, and the PWM driver is connected with a DC/DC converter; the power supply consists of a hydrogen fuel cell system and a lithium battery.
The invention provides a control method for an adjustable high-power DC/DC converter of a hybrid electric vehicle, which is characterized in that a corresponding structural schematic diagram of the control method is shown in figure 1, and the dynamic adjustment of the output power of the DC/DC converter is realized mainly through a control system 1, a vehicle control unit 2, a current sampling module 3, a voltage sampling module 4, a PWM driver 5, a power supply 6, the DC/DC converter 7 and CAN buses among the control system, the current sampling module, the voltage sampling module, the PWM driver, the power supply 6 and the DC/DC converter 7. The control system 1 comprises a main controller 1-1 and a PWM wave controller 1-2; the PWM driver 5 comprises a first path of driving module 5-1, a second path of driving module 5-2, a third path of driving module 5-3 and a fourth path of driving module 5-4; the DC/DC converter 7 comprises a first path of DC/DC converter sub-module 7-1, a second path of DC/DC converter sub-module 7-2, a third path of DC/DC converter sub-module 7-3 and a fourth path of DC/DC converter sub-module 7-4.
The main controller 1-1 is respectively connected with one end of the whole vehicle controller 2 and one end of the PWM wave controller 1-2 through a CAN bus, and the other end of the PWM wave controller 1-2 is simultaneously connected with the first path of driving module 5-1, the second path of driving module 5-2, the third path of driving module 5-3 and the fourth path of driving module 5-4; the DC/DC converter 7 is respectively connected with the current acquisition module 3 and the voltage acquisition module 4, and the current acquisition module 3 and the voltage acquisition module 4 are respectively connected with the main controller 1-1; the PWM wave controller 1-2 is respectively connected with the first drive module 5-1, the second drive module 5-2, the third drive module 5-3 and the fourth drive module 5-4; the first drive module 5-1 is connected with the first DC/DC converter submodule 7-1, the second drive module 5-2 is connected with the second DC/DC converter submodule 7-2, the third drive module 5-3 is connected with the third DC/DC converter submodule 7-3, and the fourth drive module 5-4 is connected with the fourth DC/DC converter submodule 7-4; the first path of DC/DC converter sub-module 7-1, the second path of DC/DC converter sub-module 7-2, the third path of DC/DC converter sub-module 7-3 and the fourth path of DC/DC converter sub-module 7-4 are connected in parallel in a staggered mode. The output end of the DC/DC converter 7 is connected to the permanent magnet synchronous motor M.
As shown in fig. 1, the input ends of the first path of DC/DC converter submodule 7-1, the second path of DC/DC converter submodule 7-2, the third path of DC/DC converter submodule 7-3 and the fourth path of DC/DC converter submodule 7-4 are all connected to the power supply 6, the first output end of the first path of DC/DC converter submodule 7-1 is connected to one end of the capacitor C1 and one end of the permanent magnet synchronous motor M, respectively, and the second output end of the first path of DC/DC converter submodule 7-1 is connected to the other end of the capacitor C1; a first output end of the second DC/DC converter submodule 7-2 is connected with one end of a capacitor C1 and one end of a permanent magnet synchronous motor M respectively, and a second output end of the second DC/DC converter submodule 7-2 is connected with the other end of a capacitor C1; the first output end of the third DC/DC converter submodule 7-3 is connected with one end of a capacitor C2, the second output end of the third DC/DC converter submodule 7-3 is connected with the other end of a capacitor C2, the first output end of the fourth DC/DC converter submodule 7-4 is connected with one end of a capacitor C2, the second output end of the fourth DC/DC converter submodule 7-4 is connected with the other end of a capacitor C2, the other end of the capacitor C1 is connected with one end of a capacitor C2, one end of a capacitor C1 is connected with one end of a permanent magnet synchronous motor M, and the other end of the permanent magnet synchronous motor M is connected with the other end of the capacitor C2.
A control method for an adjustable high-power DC/DC converter of a hybrid electric vehicle is shown in figure 2, and comprises the following steps:
s101, the main controller communicates with a whole vehicle controller through a CAN bus to obtain target output power of a DC/DC converter;
s102, the main controller determines the working mode of the DC/DC converter according to the target output power and a switching control strategy;
s103, the current sampling module and the voltage sampling module respectively send the acquired output current and output voltage signals of the DC/DC converter to the main controller;
s104, the main controller determines a PWM wave control signal according to the output current of the DC/DC converter, the output voltage of the DC/DC converter and the target output power;
s105, the PWM wave controller determines a PWM control signal according to the working mode and the PWM wave control signal;
s106, the PWM driver adjusts the output power of at least one path of DC/DC conversion sub-module which is put into operation according to the PWM control signal;
and S107, repeating the steps S103 to S106 until the output power of the DC/DC converter is equal to the target power.
Further, the multiple paths of DC/DC conversion sub-modules are four paths of DC/DC conversion sub-modules, and are marked as a first path of DC/DC conversion sub-module 7-1, a second path of DC/DC conversion sub-module 7-2, a third path of DC/DC conversion sub-module 7-3 and a fourth path of DC/DC conversion sub-module 7-4; the PWM driver 5 comprises a first path of driving module 5-1, a second path of driving module 5-2, a third path of driving module 5-3 and a fourth path of driving module 5-4; the first drive module 5-1 is connected with the first DC/DC conversion sub-module 7-1, the second drive module 5-2 is connected with the second DC/DC conversion sub-module 7-2, the third drive module 5-3 is connected with the third DC/DC conversion sub-module 7-3, and the fourth drive module 5-4 is connected with the fourth DC/DC conversion sub-module 7-4.
Further, the switching control strategy is as follows:
setting the rated power of a first path of DC/DC conversion submodule 7-1, a second path of DC/DC conversion submodule 7-2, a third path of DC/DC conversion submodule 7-3 and a fourth path of DC/DC conversion submodule 7-4 to be the same, and setting the rated power to be PeAccording to PeAnd target output power P0The operation mode is determined by either:
when the target power P0Is in the size range of 0<P0≤PeWhen the power supply voltage is higher than the first power supply voltage, the working mode of the DC/DC converter 7 is a first working mode, wherein the first working mode refers to the actual output power P of the first path of DC/DC conversion submodule 7-11Regulating so that the output power of the DC/DC converter 7 is equal to the target output power;
when the target power P0Is in the size range of Pe<P0≤2PeWhen the power supply is in the first working mode, the working mode of the DC/DC converter 7 is the second working mode, wherein the first working mode refers to that the output power of the first path of DC/DC conversion submodule 7-1 is the rated power of the first path of DC/DC conversion submodule 7-1Power PeFor output power P of the second DC/DC conversion submodule 7-2 only2Performing dynamic adjustment so that the output power of the DC/DC converter 7 is equal to the target output power;
when the target power P0Is in the size range of 2Pe<P0≤3PeWhen the power is in the second working mode, the working mode of the DC/DC converter 7 is the third working mode, wherein the third working mode indicates that the output powers of the first path of DC/DC conversion submodule 7-1 and the second path of DC/DC conversion submodule 7-2 are both PeFor output power P of the third DC/DC conversion submodule 7-3 only3The dynamic adjustment is performed so that the output power of the DC/DC converter 7 becomes equal to the target output power.
When the target power P0Is in the size range of 3Pe≤P0<4PeWhen the power is switched to the second operation mode, the operation mode of the DC/DC converter 7 is a third operation mode, wherein the third operation mode indicates that the output powers of the first path of DC/DC conversion sub-module 7-1, the second path of DC/DC conversion sub-module 7-2 and the third path of DC/DC conversion sub-module 7-3 are all PeFor output power P of the fourth DC/DC conversion submodule 7-4 only4The dynamic adjustment is performed so that the output power of the DC/DC converter 7 becomes equal to the target output power.
Further, the determining, by the main controller, the PWM wave control signal according to the output current of the DC/DC converter, the output voltage of the DC/DC converter, and the target output power includes:
(1) the main controller 1-1 determines the actual output power Pt＝I0*UoIn which I0Is the output current of the DC/DC converter 7, UoIs the output voltage of the DC/DC converter 7;
(2) the main controller 1-1 calculates a target output power P0And the actual output power PtPower deviation Δ P ═ P0-Pt；
(3) The main controller 1-1 is based on the output current I of the DC/DC converter 70Output voltage UoAnd power deviation delta P, and determining PWM wave control signal U by adopting voltage-current double closed-loop control strategyk。
Further, the determining, by the PWM wave controller, a PWM control signal according to the operation mode and the PWM wave control signal includes:
setting the output power of the first path of DC/DC conversion submodule 7-1, the second path of DC/DC conversion submodule 7-2, the third path of DC/DC conversion submodule 7-3 and the fourth path of DC/DC conversion submodule 7-4 as rated power Pe, wherein the required control signals are Ukm; the PWM control signals comprise Uk1, Uk2, Uk3 and Uk4, wherein Uk1, Uk2, Uk3 and Uk4 respectively form PWM1, PWM2, PWM3 and PWM3 through a first driving module 5-1, a second driving module 5-2, a third driving module 5-3 and a fourth driving module 5-4, and respectively act on a first DC/DC conversion sub-module 7-1, a second DC/DC conversion sub-module 7-2, a third DC/DC conversion sub-module 7-3 and a fourth DC/DC conversion sub-module 7-4;
when the operation mode of the DC/DC converter 7 is the first operation mode, the PWM wave controller 1-2 sets the values of Uk2, Uk3, and Uk4 to 0, and generates an adjustable PWM control signal Uk1, i.e., Uk1 ═ U, from the received PWM wave control signal Ukk；
When the operation mode of the DC/DC converter 7 is the second operation mode, the PWM wave controller 1-2 sets the values of Uk3 and Uk4 to 0, Uk1 to Ukm, and controls U according to the received PWM wavekGenerating an adjustable PWM control signal Uk2, i.e. Uk2 ═ Uk；
When the operation mode of the DC/DC converter 7 is the third operation mode, the PWM wave controller 1-2 sets the value of Uk4 to 0, Uk1 and Uk2 to Ukm, and controls U according to the received PWM wave control signalkGenerating an adjustable PWM control signal Uk3, i.e. Uk3 ═ Uk；
When the operation mode of the DC/DC converter 7 is the fourth operation mode, the PWM wave controller 1-2 sets all of Uk1, Uk2 and Uk3 to Ukm, and the PWM wave controller 1-2 controls the U according to the received PWM wavekGenerating an adjustable PWM control signal Uk4, i.e. Uk4 ═ Uk。
Further, the voltage and current double closed-loop control strategy is divided into two control closed loops, and the conventional voltage outer loop PID control method and the conventional current inner loop PID control method are respectively adopted, so that the main controller can determine the PWM wave control signal according to the output current, the output voltage and the power deviation of the DC/DC converter.
Further, the output power of at least one path of DC/DC conversion sub-module regulated by the PWM driver according to the PWM control signal is specifically:
and the PWM driver respectively adjusts the output power of the first path of DC/DC conversion sub-module, the second path of DC/DC conversion sub-module, the third path of DC/DC conversion sub-module and the fourth path of DC/DC conversion sub-module according to the values of Uk1, Uk2, Uk3 and Uk 4.
Furthermore, the control method of the adjustable high-power DC/DC converter adopts a double-CPU control structure, the first CPU is a main controller, and the second CPU is a PWM wave controller, so that the stability of the output power and the output voltage of the adjustable high-power DC/DC converter is ensured.
The control method for the adjustable high-power DC/DC converter of the hybrid electric vehicle provided by the invention is described in detail, and the implementation description is only used for helping to understand the method and the core idea of the method; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (7)

1. A control method for an adjustable high-power DC/DC converter of a hybrid electric vehicle is characterized in that the method is realized by a power supply, the DC/DC converter, a PWM driver and a control system, wherein the DC/DC converter comprises a plurality of paths of DC/DC conversion sub-modules which are connected in parallel; the control system comprises a main controller, a PWM (pulse-width modulation) wave controller, a current sampling module and a voltage sampling module, wherein the main controller is connected with the PWM wave controller through a CAN (controller area network) bus, the PWM wave controller is connected with a PWM driver, and the PWM driver is connected with a DC/DC converter; the power supply consists of a hydrogen fuel cell system and a lithium battery;
the method comprises the following steps:
s101, the main controller communicates with a whole vehicle controller through a CAN bus to obtain target output power of a DC/DC converter;
s102, the main controller determines the working mode of the DC/DC converter according to the target output power and a switching control strategy;
s103, the current sampling module and the voltage sampling module respectively send the acquired output current and output voltage signals of the DC/DC converter to the main controller;
s104, the main controller determines a PWM wave control signal according to the output current of the DC/DC converter, the output voltage of the DC/DC converter and the target output power;
s105, the PWM wave controller determines a PWM control signal according to the working mode and the PWM wave control signal;
s106, the PWM driver adjusts the output power of at least one path of DC/DC conversion sub-module which is put into operation according to the PWM control signal;
and S107, repeating the steps S103 to S106 until the output power of the DC/DC converter is equal to the target power.
2. The control method for the adjustable high-power DC/DC converter of the hybrid electric vehicle as claimed in claim 1, wherein the multi-path DC/DC conversion sub-module is four paths of DC/DC conversion sub-modules, and is marked as a first path of DC/DC conversion sub-module, a second path of DC/DC conversion sub-module, a third path of DC/DC conversion sub-module and a fourth path of DC/DC conversion sub-module; the PWM driver comprises a first path of driving module, a second path of driving module, a third path of driving module and a fourth path of driving module; the first drive module is connected with the first DC/DC conversion submodule, the second drive module is connected with the second DC/DC conversion submodule, the third drive module is connected with the third DC/DC conversion submodule, and the fourth drive module is connected with the fourth DC/DC conversion submodule.
3. The control method for the adjustable high-power DC/DC converter of the hybrid electric vehicle as claimed in claim 2, characterized in that the switching control strategy is as follows:
setting the rated power of a first path of DC/DC conversion submodule, a second path of DC/DC conversion submodule, a third path of DC/DC conversion submodule and a fourth path of DC/DC conversion submodule to be same, setting the rated power to be Pe, and setting the power to be Pe according to the Pe and a targetOutput power P0The operation mode is determined by either:
when the target output power P0Is in the size range of 0<P0≤PeWhen the direct current/direct current (DC/DC) converter works, the working mode of the DC/DC converter is a first working mode, wherein the first working mode refers to the actual output power P of the first path of DC/DC conversion submodule1Regulating and controlling to make the output power of the DC/DC converter equal to the target output power;
when the target output power P0Is in the size range of Pe<P0≤2PeWhen the power supply voltage is higher than the rated power Pe, the working mode of the DC/DC converter is a second working mode, wherein the second working mode refers to that the output power of the first path of DC/DC conversion submodule is the rated power Pe, and only the output power P of the second path of DC/DC conversion submodule is2Performing dynamic adjustment to make the output power of the DC/DC converter equal to the target output power;
when the target output power P0Is in the size range of 2Pe<P0≤3PeWhen the power supply voltage is higher than the first voltage, the working mode of the DC/DC converter is a third working mode, wherein the third working mode means that the output powers of the first path of DC/DC conversion sub-module and the second path of DC/DC conversion sub-module are both Pe, and only the output power P of the third path of DC/DC conversion sub-module is used3Performing dynamic adjustment to make the output power of the DC/DC converter equal to the target output power;
when the target output power P0Is in the size range of 3Pe≤P0<4PeWhen the DC/DC converter works, the working mode of the DC/DC converter is a fourth working mode, wherein the fourth working mode refers to that the output powers of the first path of DC/DC conversion sub-module, the second path of DC/DC conversion sub-module and the third path of DC/DC conversion sub-module are all Pe, and only the output power P of the fourth path of DC/DC conversion sub-module is equal to the output power P of the third path of DC/DC conversion sub-module4The dynamic adjustment is performed so that the output power of the DC/DC converter is equal to the target output power.
4. The method as claimed in claim 1, wherein the determining the PWM wave control signal by the main controller according to the output current of the DC/DC converter, the output voltage of the DC/DC converter and the target output power comprises:
(1) the main controller determines the actual output power Pt＝I0Uo, wherein I0Is the output current of the DC/DC converter, Uo is the output voltage of the DC/DC converter;
(2) the main controller calculates the target output power P0And the actual output power PtPower deviation Δ P ═ P0-Pt；
(3) The main controller is based on the output current I of the DC/DC converter0And the output voltage Uo and the power deviation delta P, and determining a PWM wave control signal Uk by adopting a voltage-current double closed-loop control strategy.
5. The method as claimed in claim 2, wherein the determining the PWM control signal according to the operation mode and the PWM wave control signal by the PWM wave controller comprises:
setting the output power of the first path of DC/DC conversion submodule, the second path of DC/DC conversion submodule, the third path of DC/DC conversion submodule and the fourth path of DC/DC conversion submodule to be Ukm when the rated power Pe; the PWM control signals comprise Uk1, Uk2, Uk3 and Uk4, wherein Uk1, Uk2, Uk3 and Uk4 respectively form PWM1, PWM2, PWM3 and PWM3 through a first path of driving module, a second path of driving module, a third path of driving module and a fourth path of driving module, and respectively act on the first path of DC/DC conversion sub-module, the second path of DC/DC conversion sub-module, the third path of DC/DC conversion sub-module and the fourth path of DC/DC conversion sub-module;
when the working mode of the DC/DC converter is a first working mode, the PWM wave controller sets the values of Uk2, Uk3 and Uk4 to 0, and generates an adjustable PWM control signal Uk1 according to a received PWM wave control signal Uk, namely Uk1 is equal to Uk;
when the working mode of the DC/DC converter is a second working mode, the PWM wave controller sets the values of Uk3 and Uk4 to 0, Uk1 to Ukm, and generates an adjustable PWM control signal Uk2 according to a received PWM wave control signal Uk, namely Uk2 equals Uk;
when the working mode of the DC/DC converter is a third working mode, the PWM wave controller sets the value of Uk4 to 0, both Uk1 and Uk2 to Ukm, and generates an adjustable PWM control signal Uk3 according to a received PWM wave control signal Uk, namely Uk3 equals Uk;
when the operation mode of the DC/DC converter is the fourth operation mode, the PWM wave controller sets all of Uk1, Uk2 and Uk3 to Ukm, and the PWM wave controller generates an adjustable PWM control signal Uk4 according to the received PWM wave control signal Uk, that is, Uk4 ═ Uk.
6. The control method for the adjustable high-power DC/DC converter of the hybrid electric vehicle as claimed in claim 5, characterized in that: the PWM driver adjusts the output power of at least one DC/DC conversion sub-module according to the PWM control signal, specifically:
and the PWM driver respectively adjusts the output power of the first path of DC/DC conversion sub-module, the second path of DC/DC conversion sub-module, the third path of DC/DC conversion sub-module and the fourth path of DC/DC conversion sub-module according to the values of Uk1, Uk2, Uk3 and Uk 4.
7. The control method for the adjustable high-power DC/DC converter of the hybrid electric vehicle as claimed in any one of claims 1 to 6, characterized in that: the control method of the adjustable high-power DC/DC converter adopts a double-CPU control structure, the first CPU is a main controller, the second CPU is a PWM wave controller, and the output power and the output voltage of the adjustable high-power DC/DC converter are ensured to be stable.
CN202110367290.3A 2021-04-06 2021-04-06 Control method of adjustable high-power DC/DC converter of hybrid electric vehicle Pending CN113098261A (en)

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