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Coordinated control method of multiple power sources for hybrid vehicles

A technology of hybrid electric vehicles and coordinated control, which is applied to the layout of multiple different prime movers of hybrid electric vehicles and general power plants, motor vehicles, etc., can solve the problems of insufficient consideration of the dynamic response characteristics of distribution precision components, and achieve Effects of fuel economy and dynamics targets, maintaining stability, and coordinating torque distribution balance

Active Publication Date: 2017-04-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a multi-power source coordinated control method for a hybrid hybrid vehicle, which can solve the problem of dynamic regulation control and supplement the distribution accuracy of the basic energy management method and the dynamic response characteristics of components Insufficient consideration should be taken into account to effectively coordinate the power distribution of multiple power sources and the torque distribution balance of multiple power components in the hybrid system to ensure the stability and reliability of the system components, and to ensure the balance between the system's power demand and electric power

Method used

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  • Coordinated control method of multiple power sources for hybrid vehicles
  • Coordinated control method of multiple power sources for hybrid vehicles
  • Coordinated control method of multiple power sources for hybrid vehicles

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Embodiment 1

[0044] Embodiment 1: as Figure 4 As shown, the planetary mechanism has three free ends of the planetary carrier, the ring gear and the sun gear, which are respectively connected to the engine and the electric motor of the hybrid power system (ie Figure 4 Medium motor B), generator (namely Figure 4 Middle motor A) Three power components.

[0045] Through the analysis of the coupling characteristics of the power coupling mechanism, the torque and speed of each power component of the parallel hybrid system satisfy a certain steady-state constraint relationship, namely

[0046]

[0047]

[0048] In the formula, n A is the generator speed; n B is the motor speed; n i Input the rotational speed for the power coupling mechanism, which is equal to the engine rotational speed; n o is the output speed of the power coupling mechanism; T A is the generator torque, negative value represents power generation; T B Is the torque of the motor, and the positive value represents ...

Embodiment 2

[0057] Embodiment 2: The DC bus bar system of the hybrid power system such as Figure 7 shown. Due to the error of the power distribution model and the calculation error of the motor power and efficiency, the power of each motor may deviate from the expected value. However, the power battery pack in the hybrid system as a "power storage pool" will balance this deviation, but the battery pack will be in a state of overcharging or discharging, which will cause unexpected drastic changes in the state of charge of the battery It affects the normal multi-power source power distribution, and has a very adverse effect on the life of the battery pack. Therefore, it is necessary to detect and control the electric power imbalance of the hybrid system.

[0058] From the DC bus structure of the hybrid system and the above analysis, it can be seen that the unbalanced amount of electric power will be directly reflected in the state of the battery, so identifying and monitoring the state o...

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Abstract

The invention discloses a multi-power-source coordinating control method for a series-parallel hybrid power vehicle, and provides a method for detecting electromechanical coupling torque conflict based on engine rotating speed deviation and unbalance electric power quantity based on the battery pack bus voltage fluctuation. An electromechanical torque coordination control method is provided according to the engine control target and the set actual rotting speed difference torque coordination coefficients. An electromechanical power coordination control method is provided according to the electric power coordination coefficients calculated and solved through a battery pack model and a multi-motor torque by decoupling. The method can solve the dynamic regulating control problem and overcome the shortages on distribution precision of the basic energy management method and insufficient consideration on the dynamic response property of a part; the multi-power-source power distribution of a hybrid power system and the torque distribution balance of multi-power elements can be effectively coordinated; therefore, the working stability and reliability of the system part can be ensued; the power consumption demand and the electric power balance of the system can be ensured; over-charge and over-discharge of the battery pack can be avoided; the service life of a power battery pack can be prolonged.

Description

technical field [0001] The invention relates to a coordinated control method, in particular to a multi-power source coordinated control method for a hybrid hybrid vehicle. Background technique [0002] The hybrid hybrid system is a feasible solution for heavy-duty vehicles to achieve electric drive. Although it has a complex structure and is difficult to control, it combines the advantages of parallel and series hybrids and has excellent fuel economy and power performance. The control method has always been a hot spot in the research of hybrid power systems. Due to the wide speed range and large speed ratio required by heavy-duty vehicles, hybrid power systems applied to heavy-duty vehicles generally include multi-speed transmissions. The coordinated control method of bit switching process, reasonable distribution of electromechanical torque and cooperation is an important aspect of the research on the control method of serial hybrid. [0003] In China, Tsinghua University ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60K6/44B60W20/10B60W10/26B60W10/06B60W10/08
CPCY02T10/62
Inventor 王伟达项昌乐邱文伟马越韩立金
Owner BEIJING INSTITUTE OF TECHNOLOGYGY