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Control method of seven-in-one high-voltage integrated system of electric vehicle

A control method and high-voltage integration technology, which is applied in the direction of electric vehicles, control drives, control/regulation systems, etc., can solve the problems of restricting large-scale popularization and application, large impact of mode switching, and low degree of integration, so as to reduce the individuality of EMI sources Number, mode switching without impact, the effect of reducing volume and weight

Active Publication Date: 2021-07-16
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the high-voltage integrated systems launched by domestic and foreign mainstream manufacturers are mostly "three-in-one" or "four-in-one". However, problems such as high cost, large volume, low efficiency, and large impact of mode switching caused by the low degree of integration are still prominent. , restricting its large-scale application in electric vehicles

Method used

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  • Control method of seven-in-one high-voltage integrated system of electric vehicle
  • Control method of seven-in-one high-voltage integrated system of electric vehicle
  • Control method of seven-in-one high-voltage integrated system of electric vehicle

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Embodiment 1

[0047] Embodiment 1: as figure 2 As shown, this embodiment provides a specific implementation process of the soft-start algorithm. Enter the soft-start algorithm immediately after switching the working mode of the integrated system to avoid the step change of the current caused by the jump of the IGBT drive signal duty cycle, and ensure that the current changes slowly after switching and then gradually accelerates until the output is within the range of the interval-type fuzzy PID control, then exit Soft start algorithm.

[0048] Its specific description is as follows:

[0049]

[0050] In the formula, △α(k) is the soft-start step size at time k; ε 0 is the initial step size; α(k) is the soft start value at time k, and its maximum cannot exceed the maximum soft start value α amx . It is easy to get that △α(k) is a linear function of k. When k is larger, its value is larger, that is, the soft-start step size gradually becomes larger, which can ensure that the soft-start...

Embodiment 2

[0058] like image 3 and 4 As shown, this embodiment provides a specific implementation process of the integrated system in the vehicle charger mode, including its circuit structure and the double-loop interval-type II fuzzy PID algorithm. The front-stage PFC adopts a double-loop interval type-two fuzzy PID algorithm with a voltage outer loop, and the rear-stage DC / DC adopts a double-loop interval type-two fuzzy PID algorithm with a variable outer loop and a smooth switching algorithm.

[0059] In the charger mode, the front-stage APFC circuit is responsible for rectification, boosting and improving the power factor, and provides stable high-voltage direct current for the subsequent stage circuit. The input and output requirements are relatively stable, there are no complicated working conditions, and the control is relatively simple. The latter stage DC / DC circuit mainly modulates the electric energy according to the state of the battery, starts constant current charging fo...

Embodiment 3

[0065] like Figure 5 , as shown in 6 and 7, this embodiment provides the specific implementation process of the power inverter and the motor controller under the discharge condition, including the power inverter including the three-phase power inverter and the single-phase power inverter and the motor The specific circuit structure and control method of the controller.

[0066] After the driver manually selects the power inverter mode, the system turns on the outside world, and the power battery is modulated by DC / DC and then sent to the DC / AC inverter to output external power supply. Its power conversion form is opposite to that of the on-board charger. The second high-voltage half-stage DC / DC circuit is used as the front-stage LLC resonant circuit, and the electric energy is transferred to the double post-stage through the three-phase transformer. The first high-voltage half-stage is used as a high-power post-stage LLC resonant circuit 1, which regulates the input power an...

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Abstract

The invention discloses a control method for a seven-in-one high-voltage integrated system of an electric vehicle. A circuit structure of the integrated system comprises a bidirectional AC / DC-APFC, a three-phase transformer, a high-power isolation type bidirectional DC / DC and a low-power isolation type DC / DC, wherein the high-power isolation type bidirectional DC / DC and the low-power isolation type DC / DC share a pre-stage circuit. Working modes of the integrated system comprise a charging mode, a power supply inversion mode and a driving mode. The control method comprises a double-loop interval type-2 fuzzy PID vehicle-mounted charger control strategy, an interval type-2 fuzzy PID DC / DC converter control strategy and a double-loop interval type-2 fuzzy PID motor controller control strategy, and specifically comprises a soft start algorithm and a smooth switching algorithm. By designing a coupling control strategy, an advanced intelligent control method, a soft start algorithm and a smooth switching algorithm, the working efficiency of the whole system is improved, mode switching is impact-free and smooth, the current step change caused by mode switching is reduced, components are prevented from being damaged by spike current, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a control method for a seven-in-one high-voltage integrated system of an electric vehicle. Background technique [0002] Under the alarm bell of the era of energy crisis and intensified environmental pollution, due to the problems of high fuel consumption and high emissions of traditional fuel vehicles, some countries have proposed a ban on the sale of fuel vehicles one after another. New energy vehicles are expected to replace fuel vehicles and become the mainstream means of transportation in the future. Among energy vehicles, pure electric vehicles have the lowest emission and the highest energy density. In earlier pure electric vehicles, the number of various electronic control systems is large and the distribution is redundant, resulting in a large overall circuit structure and a large demand for controllers. Integrated design is the trend of the times. Combining s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02M1/42H02M3/335H02M1/32H02M1/44H02M1/36B60L3/00B60L15/20
CPCH02M7/219H02M1/4241H02M1/4233H02M3/33584H02M1/32H02M1/44H02M1/36B60L15/20B60L3/00Y02T10/72Y02T10/70
Inventor 张庭森黄晓蓉彭忆强赵玉友
Owner XIHUA UNIV