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Hybrid electric vehicle start auxiliary control method

A hybrid vehicle, auxiliary control technology, applied in hybrid vehicles, motor vehicles, transportation and packaging, etc., can solve the problems of low-displacement engine power and torque drop, easy engine flameout, etc., to prevent flameout and achieve smoothness Effect

Inactive Publication Date: 2011-05-25
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor has found that the prior art has at least the following problems: one of the disadvantages of using a small displacement engine is the reduction of its power and torque, which causes the engine to be easily stalled when the vehicle starts, especially in the This is more likely to happen when starting off a hill and where the road resistance is high

Method used

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  • Hybrid electric vehicle start auxiliary control method
  • Hybrid electric vehicle start auxiliary control method

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Embodiment 1

[0024] figure 1 Shown is the connection diagram of a typical parallel hybrid system, refer to figure 1 The rotor of the ISG (Integrated Starter and Generator) motor is rigidly connected to the crankshaft of the engine. The ISG motor can be used to start the engine, and can be used for power generation and auxiliary drive.

[0025] refer to image 3 , the present embodiment provides a hybrid electric vehicle starting assist control method, mainly comprising: the vehicle control system obtains the starting state signal to determine whether the vehicle is in the starting state; if the vehicle is in the starting state, then obtains the engine speed signal and determines whether the engine Whether the rotation speed is lower than the idle speed; if the obtained engine speed is lower than the idle speed, then obtain the motor auxiliary torque according to the engine speed; the vehicle control system controls the motor to output the auxiliary torque to assist the car to start.

[0...

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Abstract

The invention discloses a hybrid electric vehicle start auxiliary control method, which belongs to the field of hybrid electric vehicle start auxiliary control. The method comprises the following steps: acquiring a start state signal; if an automobile is in a start state, acquiring an engine speed signal; if engine speed is lower than idling speed, acquiring the auxiliary torque of a motor according to the engine speed; and controlling the motor to output the auxiliary torque. In the invention, the variable auxiliary torque is provided by the motor according to the engine speed, thereby, a hybrid electric vehicle can be smoothly started and engine miss is prevented.

Description

technical field [0001] The present invention relates to the start assist control of a hybrid electric vehicle, in particular to a start assist control method that can not only effectively improve the start stability of a hybrid electric vehicle, but also greatly reduce the probability of engine flameout and improve the reliability of the vehicle operation . Background technique [0002] With the increasing consumption of global oil resources causing the tension of energy supply and the deterioration of the global environment, from the perspective of alleviating resource tension and protecting the environment, as well as meeting the regulatory requirements of governments and the promotion of government incentives, hybrid power Automobiles are popular all over the world as new energy vehicles. [0003] The powertrain system of a hybrid electric vehicle is a combination of an engine and a motor. One of the reasons for its fuel saving is that the engine with a small displacemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W20/00B60W10/08B60W10/06B60W40/10B60W20/10
CPCY02T10/6286Y02T10/62
Inventor 孙四军
Owner CHERY AUTOMOBILE CO LTD
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