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Method for controlling engine revolution speed during starting of hybrid power vehicle

A hybrid vehicle, engine speed technology, applied in hybrid vehicles, combustion engines, internal combustion piston engines, etc., can solve problems such as poor engine and electrode coordination, engine combustion pollution, affecting vehicle NVH performance, etc., to improve NVH performance effect

Inactive Publication Date: 2011-09-14
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After the current hybrid vehicle is stopped, when the internal combustion engine needs to be started, the motor needs to be used to drive the engine to rotate, and when the engine starts to rotate, fuel injection and ignition are started, which not only easily causes the engine speed to rush very high, but also makes the engine burn more. Fuel will cause more pollution emissions, and the sudden ignition and combustion of the engine at low speed will cause poor cooperation between the engine and the electrode, resulting in mechanical impact between the two and affecting the NVH performance of the vehicle

Method used

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  • Method for controlling engine revolution speed during starting of hybrid power vehicle
  • Method for controlling engine revolution speed during starting of hybrid power vehicle
  • Method for controlling engine revolution speed during starting of hybrid power vehicle

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Such as figure 1 As shown, in the method for controlling the engine speed when the hybrid electric vehicle is started in this embodiment, the ISG motor is connected in parallel with the engine. After the electric motor increases the rotational speed of the engine to 500 revolutions per minute exceeding the first predetermined rotational speed, the engine is controlled to perform fuel injection and ignition, and the ISG electric motor exits the speed mode at the same time.

Embodiment 2

[0021] Such as figure 2 As shown, the difference from Embodiment 1 is that in the method for controlling the engine speed when the hybrid electric vehicle starts in this embodiment, when the ISG motor exits the speed mode, it first enters the zero torque mode, and at the first predetermined interval of 100 milliseconds Then enter the power generation torque mode to apply power generation torque to the engine until the start process ends.

[0022] When the ISG motor is used to apply generating torque to the engine, the higher the rotation speed of the engine, the greater the applied generating torque.

Embodiment 3

[0024] Such as image 3 As shown, the difference from Embodiments 1 and 2 is that in the method for controlling the engine speed when the hybrid electric vehicle starts in this embodiment, after the ISG motor exits the speed mode, the ISG motor first enters the zero torque mode. If the engine speed is at the second If the speed is higher than the second predetermined speed of 600 r / min within a predetermined interval (150 milliseconds), it will enter the power generation torque mode, otherwise it will remain in the zero torque mode until the start-up process ends.

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Abstract

The invention aims at providing a method for controlling engine revolution speed during starting of a hybrid power vehicle, in order to improve the fuel economy of the entire vehicle, reduce emission, lighten environmental pollution and improve the NVH (Noise Vibration and Harshness) performances of the entire vehicle. In the method, an ISG (Integrated Starter Generator) motor is used for driving an engine to rotate, the key point is that the engine is controlled to perform oil injection and ignition when the revolution speed of the engine is increased to exceed a first preset revolution speed by the ISG motor, and the ISG motor retreats a speed mode at the same time. In the method for controlling the engine revolution speed during starting of the hybrid power vehicle, by controlling the ignition time of the engine and the working mode variation of the ISG motor in a starting stage, the starting peak revolution speed of the engine is decreased, the fuel economy of the entire vehicle is further improved, and pollutant emission and environment pollution caused by the same are reduced, meanwhile, the NVH performances of the entire vehicle are improved.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicles, and in particular relates to a method for controlling the engine speed when the hybrid electric vehicle starts. Background technique [0002] Hybrid electric vehicle is a kind of energy-saving and environment-friendly automobile. Its energy-saving and environmental protection features are important factors for hybrid electric vehicles to be welcomed by customers and governments. Therefore, these factors must be considered when designing hybrid electric vehicles. [0003] After the current hybrid vehicle is stopped, when the internal combustion engine needs to be started, the motor needs to be used to drive the engine to rotate, and when the engine starts to rotate, fuel injection and ignition are started, which not only easily causes the engine speed to rush very high, but also makes the engine burn more. Fuel will cause more pollution emissions, and the sudden ignition and combu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/06B60W10/08B60W20/00
CPCY02T10/6286Y02T10/52Y02T10/40Y02T10/62
Inventor 孙四军
Owner CHERY AUTOMOBILE CO LTD
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