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DCDC control method and system of 48V hybrid power system

A technology of a hybrid power system and a control method, which is applied in the DCDC control method and system field of a 48V hybrid power system, can solve the problems of low power utilization rate, low fuel consumption, etc., and achieve the goal of improving the utilization rate and improving the fuel saving rate of the whole vehicle Effect

Active Publication Date: 2018-09-11
GEELY AUTOMOBILE INST NINGBO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing 48V light-hybrid system has the problems of low power utilization rate and low fuel consumption in the control of DCDC

Method used

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  • DCDC control method and system of 48V hybrid power system
  • DCDC control method and system of 48V hybrid power system
  • DCDC control method and system of 48V hybrid power system

Examples

Experimental program
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Effect test

Embodiment 1

[0035] An embodiment of the present invention provides a 48V hybrid low-voltage power supply system, see figure 1 The schematic diagram of the 48V hybrid low-voltage power supply system shown, which shows the ECU (Electronic Control Unit, electronic control unit or vehicle controller), 48V battery pack, 48V BSG motor, DC converter DCDC, 12V starter, 12V battery and 12V electrical load.

[0036] exist figure 1 As shown in the figure, the ECU is connected to the BMS (Battery Management System, battery management system) of the 48V battery pack, the 48V BSG motor, and the DC converter DCDC respectively; the 48V battery pack is connected to the 48V BSG motor and the DC converter DCDC through the 48V wiring harness; The DC converter DCDC is connected to the 12V starter, 12V battery and 12V electrical load through the 12V wiring harness. The vehicle controller ECU controls the working status of the 48V battery pack, 48V BSG motor, and DC converter through CAN.

[0037] The 48V BS...

Embodiment 2

[0042] An embodiment of the present invention provides a DCDC control method for a 48V hybrid power system, which is applied to an ECU of a vehicle, and the specific connection method is as in the above embodiment. The DC converter DCDC can supply power to a low-voltage battery and a load. In this embodiment, a 12V battery and a load are taken as examples for illustration.

[0043] see figure 2 The flow chart of the DCDC control method of the shown 48V hybrid system, the method includes the following steps:

[0044] Step S202, acquiring the current working condition of the BSG system.

[0045] The ECU obtains the current working condition of the BSG system, and can determine the current working condition by obtaining the working mode of the 48VBSG motor. For example, the 48VBSG motor can be in the electric mode or in the power generation mode. The current working conditions of the BSG include the following: start-stop working conditions, power-assist working conditions, ene...

Embodiment 3

[0063] An embodiment of the present invention provides a DCDC control system of a 48V hybrid power system, which is applied to the ECU of a vehicle, where the ECU is connected to a DC converter DCDC, and the DC converter DCDC is connected to a low-voltage battery; see Figure 9The structural block diagram of the DCDC control system of the 48V hybrid power system shown, the system includes:

[0064] The obtaining module 91 is used to obtain the current working conditions of the BSG system; the current working conditions include: start-stop working conditions, boosting working conditions, energy recovery working conditions and abnormal working conditions;

[0065] A voltage determination module 92, configured to determine the step-down charging voltage value of the DC converter DCDC according to the current working condition;

[0066] The control module 93 is configured to control the working state of the DC converter according to the buck charging voltage value.

[0067] Where...

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Abstract

The invention provides a DCDC control method and system of a 48V hybrid power system, and relates to the technical field of vehicle power control. The DCDC control method includes the steps that current working conditions of a BSG system are obtained, wherein the current working conditions include the starting-stopping working condition, the assistance working condition, the energy recovery working condition and the abnormal working condition; according to the current working conditions, a voltage-reduction charging voltage value of a direct current converter DCDC is determined; according to the voltage-reduction charging voltage value, the working state of the direct current converter is controlled. According to the DCDC control method and system of the 48V hybrid power system in the embodiment, the voltage-reduction charging voltage value of the direct current converter DCDC can be determined according to the current working conditions of the BSG, the working state of the direct current converter is controlled according to the voltage-reduction charging voltage value, a charging voltage range value corresponding to the voltage-reduction mode is determined according to the workingconditions of the BSG, conversion of electric energy is flexibly and effectively controlled accordingly, and the use ratio of electric energy and the fuel saving ratio of a vehicle are increased.

Description

technical field [0001] The invention relates to the technical field of automobile power control, in particular to a DCDC control method and system for a 48V hybrid power system. Background technique [0002] Chinese laws and regulations are becoming more and more strict on the fuel consumption of passenger cars. There is still a big gap between the current technical level of domestic OEMs and the goals of the fourth stage; all major automakers are looking for suitable and effective technical solutions. 48V system as a A low-input, high-return technical solution is currently being accepted and adopted by more and more OEMs. Compared with traditional vehicles, the 48V light hybrid system introduces BSG (Boost recuperation system, energy recovery system) motors, 48V power battery packs, and DCDC converters. It saves 10% to 15% of fuel consumption and realizes diversified driving modes. BSG start-stop, dynamic power assist, braking energy recovery, taxiing energy recovery and v...

Claims

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Application Information

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IPC IPC(8): B60W20/00B60W20/14B60W10/26B60W10/08
CPCB60W10/08B60W10/26B60W20/00B60W20/14B60W2510/244B60W2510/246B60W2710/08B60W2710/242
Inventor 吕登科胡峥楠
Owner GEELY AUTOMOBILE INST NINGBO CO LTD
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