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Dragging torque control method and system

A technology of torque control and target torque, applied in the direction of engine control, engine components, engine starting, etc., can solve the problems of NVH noise, insufficient engine starting smoothly, achieve smooth starting, improve NVH performance, avoid jitter and noise Effect

Active Publication Date: 2021-10-01
DONGFENG MOTOR GRP
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  • Abstract
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Problems solved by technology

[0004] The present invention provides a drag torque control method and system to solve or partially solve the current technical problem of NVH noise caused by insufficient smooth starting of the engine

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  • Dragging torque control method and system
  • Dragging torque control method and system

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Embodiment Construction

[0036] In order to enable those skilled in the technical field to which the application belongs to understand the application more clearly, the technical solutions of the application will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] Usually, in the process of starting the engine, the generator plays the role of the starter, and the generator is used to drag the engine speed to the target speed. During the starting process, there is a corresponding resonance range between the engine and the engine (for example, 200-600rpm), so the engine speed needs to pass through this range quickly, otherwise the resonance between the engine and the generator will cause NVH noise, so a large drag is required. The dynamic torque is used to quickly drag the engine speed to the idle target speed to start the engine, which will shorten the engine start time; but if the engine start time is shortened, the engine speed will be too ...

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Abstract

The invention discloses a dragging torque control method and system. The method comprises the steps that in a starting process of an engine, the change rates of different dragging torques in all intervals are controlled according to the different engine rotating speed intervals, thus the dragging torques of a generator to the engine are reduced along with rising of the rotating speed of the engine, smooth starting of the engine is achieved, jitter and noise caused by large rotating speed change in the starting process are avoided, meanwhile, the abrasion risk of a bearing bush of the engine is considered, the maintaining time of the engine at the low rotating speeds is prolonged, dragging torque segmented control is achieved, the NVH performance of an electric automobile is improved, and the dragging torque control method and system have important significance to prolonging of the service life of the engine.

Description

technical field [0001] The present application relates to the technical field of electric vehicles, in particular to a drag torque control method and system. Background technique [0002] Energy and environmental issues are important factors restricting the sustainable development of human society and economy. In the field of transportation, electric vehicles have the advantages of zero emission and no pollution, but the driving range and charging factors of batteries greatly limit the large-scale market of electric vehicles. promote. A hybrid vehicle is a power device composed of an engine, a generator, a drive motor, and a battery pack. Through the control of the clutch, different driving modes of the vehicle are realized, such as: pure electric drive, series drive, parallel drive, and braking energy. Recycling and other working modes, through the above working modes, the fuel economy of the vehicle can be optimized, thereby greatly increasing the mileage of the hybrid ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02N11/08F02D29/02
CPCF02N11/0803F02D29/02F02N2200/022F02D2200/101Y02T10/62
Inventor 张顺贾江涛庹汉郧李仕成周浩
Owner DONGFENG MOTOR GRP
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