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Method for calculating torque capacity of light hybrid power system

A technology of power system and calculation method, applied in hybrid vehicles, motor vehicles, transportation and packaging, etc., can solve the problem of lack of accurate and reliable sources

Active Publication Date: 2019-12-13
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The charging and discharging torque capacity of the power system is an important factor affecting the power drive and energy recovery of the vehicle. If the torque capacity of the power system cannot be accurately calculated, then the calculation of the drive torque demand and energy recovery torque of the vehicle cannot be accurately and reliably calculated. source, therefore, how to accurately and effectively calculate the torque capacity of the power system is the key problem to be solved at present

Method used

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  • Method for calculating torque capacity of light hybrid power system
  • Method for calculating torque capacity of light hybrid power system
  • Method for calculating torque capacity of light hybrid power system

Examples

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Embodiment 1

[0050] This embodiment provides a method for calculating the torque capability of a mild hybrid system. The mild hybrid system includes a connected motor-battery system, an engine, and a gearbox. The motor-battery system includes a motor and a battery. like figure 1 As shown, the method for calculating the maximum discharge torque capacity of the light hybrid system includes the following steps:

[0051] S101. Calculate the maximum discharge torque of the motor-battery system in, is the maximum discharge torque of the motor at the output end of the engine, is the maximum discharge torque of the battery at the output end of the engine;

[0052] S102. Calculate the maximum torque of the engine at the current speed

[0053] S103. Calculating the maximum discharge torque of the mild hybrid power system Among them, i trans is the transmission speed ratio of the gearbox.

[0054] like figure 2 As shown, the method for calculating the maximum discharge torque capacity ...

Embodiment 2

[0084] like image 3 As shown, this embodiment provides a method for calculating the torque capacity of a mild hybrid power system. The light hybrid power system includes a connected motor-battery system, engine, gearbox, DC converter, clutch, HCU and MCU, and the motor-battery The system includes a belt-driven starter generator (Belt-driven Starter Generator, BSG motor for short), a 48V battery and a 12V battery. The output end of the gearbox is connected to the wheels, and the maximum discharge torque of the mild hybrid system and the maximum charge torque of the mild hybrid system both refer to the maximum torque output to the wheels by the mild hybrid system.

[0085] The mild hybrid system is a 48V mild hybrid system, such as Figure 4 As shown, the calculation method of the maximum discharge torque capacity of the mild hybrid system includes the following steps:

[0086] S201. According to the motor torque characteristics, temperature characteristics, and MCU network s...

Embodiment 3

[0100] This embodiment provides a method for calculating the torque capacity of a mild hybrid system. The mild hybrid system includes a connected motor-battery system, engine, gearbox, DC converter, clutch, HCU and MCU. The motor-battery system includes a motor and battery. Among them, the motor is a belt-driven starter generator (Belt-driven Starter Generator, BSG motor for short), the battery is a 48V power battery pack, and the DC converter is a DCDC converter.

[0101] The light hybrid power system is a 48V light hybrid power system, and the calculation method for the maximum discharge torque capacity of the light hybrid power system includes the following steps:

[0102] S301. According to the motor speed-torque external characteristic curve, use the look-up table method to obtain the maximum discharge torque T of the motor at the current speed mDischrg ;

[0103] S302. According to the motor temperature-torque limit characteristic curve, use the look-up table method to...

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Abstract

The invention relates to the technical field of automobile drive systems, in particular to a method for calculating the torque capacity of a light hybrid power system. According to the method for calculating the torque capacity of the light hybrid power system, in the process of calculating the maximum discharge torque of the light hybrid power system and the maximum charge torque of the light hybrid power system, parameters of the maximum discharge torque of a motor-battery system, the maximum charge torque of the motor-battery system, the maximum torque of an engine at the current rotating speed, the maximum reversing drag torque of the engine and the transmission speed ratio of a gearbox are adopted as the calculation basis, and therefore the torque capacity from output to the wheel endof the light hybrid power system can be calculated out effectively, truly and reliably.

Description

technical field [0001] The invention relates to the technical field of vehicle drive system control, in particular to a method for calculating the torque capacity of a mild hybrid power system. Background technique [0002] 48V mild hybrid electric vehicles are being promoted and developed by more and more automobile manufacturers due to their own advantages such as good fuel-saving effect and low cost. For vehicles that obtain power from similar power sources, the 48V battery supplies power to the motor, and then superimposes the engine torque capacity, which not only ensures the driving output capability of the vehicle, but also optimizes the working area of ​​the engine. At the same time, during the coasting and braking phases, hybrid The system will carry out effective energy recovery, ultimately reducing fuel consumption and emissions, and achieving the goal of energy saving and emission reduction for the entire vehicle. [0003] The charging and discharging torque cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/08B60W10/06B60W10/26B60W20/10
CPCB60W10/06B60W10/08B60W10/26B60W20/10B60W2510/0638B60W2510/0657B60W2510/081B60W2510/083B60W2510/087B60W2510/246Y02T10/62
Inventor 伍庆龙
Owner CHINA FIRST AUTOMOBILE
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