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Hybrid electric vehicle gearbox input end torque distribution method and vehicle

A hybrid electric vehicle, torque distribution technology, applied in hybrid electric vehicles, motor vehicles, transportation and packaging, etc., can solve the problems affecting the fuel economy of the vehicle and the torque response accuracy of the gearbox input shaft, so as to improve the fuel economy , accurate compensation, and the effect of improving the accuracy of torque response

Active Publication Date: 2021-11-12
DONGFENG MOTOR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the torque compensation of the speed closed-loop control will affect the torque response accuracy of the gearbox input shaft, which in turn will affect the fuel economy of the vehicle

Method used

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  • Hybrid electric vehicle gearbox input end torque distribution method and vehicle
  • Hybrid electric vehicle gearbox input end torque distribution method and vehicle
  • Hybrid electric vehicle gearbox input end torque distribution method and vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1, the main electronically controlled drive assembly of a hybrid electric vehicle is as follows: figure 1 As shown, it includes an engine 1 , an integrated starter / generator (ISG) 2 , a drive motor 3 , a high-voltage battery 4 , and a clutch 5 .

[0076] The ISG is directly connected to the engine for starting, power generation and boosting; the engine and the drive motor output power together, and a clutch is arranged behind the engine to switch the transmission state. In the pure electric state, neither the engine nor the ISG motor works, and the power battery provides electric energy to drive the motor to drive the vehicle; in the series state, the clutch is disengaged, the engine does not participate in driving the vehicle, and is only responsible for driving the ISG motor to generate electricity, supplying the drive motor to drive the vehicle, The excess power generation is stored in the power battery; in the parallel state, the clutch is engaged, and th...

Embodiment 2

[0140] Embodiment 2, the principle and technical solution of this embodiment are basically the same as those of Embodiment 1, the difference lies in: the gas path torque and fire path torque of the engine based on the margin torque and rotational speed closed-loop control demand compensation currently available from the ISG, Distribute the engine air path torque, fire path torque, and ISG torque at the input end of the gearbox. The ISG torque compensation is directly compensated according to the margin torque currently available from the ISG, and the portion exceeding the ISG margin torque is compensated by the engine air path torque.

Embodiment 3

[0141] Embodiment three, the principle and technical scheme of this embodiment are basically the same as embodiment one, and its difference is: the design standard of described fuzzy control rule is: "the bigger the engine gas path torque of demand compensation, the higher the engine speed difference The faster the speed, the greater the increase of the fuzzy control amount”; “The engine air path torque that needs to be compensated is close to 0, the speed difference of the engine speed does not change much, and the fuzzy control amount basically remains unchanged”; “The smaller the engine air path torque that needs to be compensated, The faster the engine speed difference decreases, the greater the reduction of the fuzzy control amount."

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Abstract

The invention relates to the field of hybrid power control, in particular to a hybrid electric vehicle gearbox input end torque distribution method and a vehicle. On the basis that ISG torque response is faster than engine torque response, engine torque and ISG torque at the input end of a gearbox are redistributed, part of engine gas path torque and fire path torque are distributed to the ISG torque for compensation, and the torque response precision of an input shaft of the gearbox can be improved; a fuzzy control method is adopted, fuzzy control quantity is output only according to two parameters of engine gas path torque MAir needing to be compensated and the change rate dnDiff of the difference between the target rotating speed and the actual rotating speed of the engine, and the problems that engine torque response has nonlinearity, time varying and large delay are solved; and the compensated engine gas path torque is automatically updated according to the change rate jointly determined by the engine water temperature and the atmospheric pressure, so that the engine can adapt to the low-temperature and high-altitude working conditions, and the fuel economy of the vehicle is further improved.

Description

technical field [0001] The invention relates to the field of hybrid power control, in particular to a method for distributing torque at the input end of a gearbox of a hybrid electric vehicle and the vehicle. Background technique [0002] Common sources of power at the input end of the hybrid vehicle gearbox include ISG (integrated starter / generator motor) and the engine. For the torque required by the gearbox, the torque of the ISG and the engine needs to be allocated. Engine torque includes gas path torque and fire path torque. The engine gas path torque is realized by converting the required torque into the desired intake air volume, and the engine fire path torque is realized by converting the required torque into the target ignition angle. [0003] In order to improve the fuel economy of the entire vehicle, the engine needs to work in its best working area as much as possible. For the engine, the division of the working area will take into account the engine speed and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/15B60W20/30B60W10/06B60W10/30
CPCB60W20/15B60W20/30B60W10/06B60W10/30Y02T10/40Y02T10/62
Inventor 秦龙王冬岳永召张桂军徐鑫
Owner DONGFENG MOTOR GRP