An idle speed control method of a hybrid electric vehicle

A hybrid electric vehicle, idle speed control technology, applied in hybrid electric vehicles, motor vehicles, transportation and packaging, etc., can solve problems such as speed overshoot, slow idle speed adjustment, idle speed instability, etc.

Active Publication Date: 2018-12-18
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide an idle speed control method of a hybrid electric vehicle to solve the problems of overshooting, unstable idle speed and slow idle speed adjustment in the idle speed control of traditional fuel vehicles.

Method used

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  • An idle speed control method of a hybrid electric vehicle

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Embodiment Construction

[0024] The embodiment of the present invention discloses an idle speed control method of a hybrid electric vehicle, so as to solve the problems that the idling speed control of a traditional fuel vehicle often has overshoot, unstable idle speed and slow idle speed adjustment.

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0026] See figure 2 , figure 2 It is a schematic flow chart of an idle speed control method for a hybrid electric vehicle provided by an embodiment of the presen...

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Abstract

The invention discloses an idle speed control method of a hybrid electric vehicle. The idle speed control method comprises the following steps: respectively calculating an idle target speed required by current energy management and a minimum speed of current power system; obtaining a transmission request speed and an engine request speed respectively; taking the maximum of idle speed, transmissionrequest speed and engine request speed, and taking the minimum of the maximum and the minimum of the powertrain speed as the motor target speed; controlling the motor torque by the motor PID controller so that the motor speed reaches the motor target speed and the power system enters the stable idle speed. the method is applied, the idle speed control of the engine with different rotational speeds is realized by the rotational speed control of the electric motor, The motor has fast torque response and stable idle speed, and adopts PID control mode, which limits the upper and lower limits of torque and the speed of change in the speed control process of the motor, ensures the smoothness of the vehicle when entering or exiting the idle speed working condition, and improves the fuel consumption level and NVH level in the idle speed process.

Description

Technical field [0001] The invention relates to the field of new energy power systems, and more specifically, to an idle speed control method of a hybrid electric vehicle. Background technique [0002] More and more stringent fuel consumption regulations have greatly promoted the development of automotive energy-saving technologies. Compared with traditional internal combustion engine vehicles with low thermal efficiency, severe exhaust gas pollution, and short driving range and high cost of pure electric vehicles, hybrid vehicles have both low The characteristics of emission and high driving range have gradually become the benchmark for automobile development. Among them, the electromechanical coupling transmission system of P2 configuration is widely used in hybrid power transmission systems. [0003] In the hybrid power transmission system of P2 configuration, such as figure 1 , figure 1 It is a schematic structural diagram of a hybrid power transmission system in the prior art...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/10B60W10/06B60W10/08
CPCB60W10/06B60W10/08B60W20/10B60W2510/0638B60W2510/1015B60W2710/0644B60W2710/083Y02T10/62
Inventor 刘振涛翟钧陈卓冷星星
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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