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Engine starting method of hybrid power vehicle power system

A hybrid vehicle and engine starting technology, which is applied in the power system field of hybrid vehicles, can solve problems such as slow start, slippery slopes, and power performance degradation of the vehicle, and achieve fast engagement process, stable driving torque of the whole vehicle, and smooth operation sexual effect

Inactive Publication Date: 2015-08-19
BEIQI FOTON MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that in the engine starting process of the hybrid electric vehicle power system of the prior art, the mode of using neutral gear will make the vehicle be in a powerless driving state during the starting process, thereby directly causing the power performance Decline, especially in the process of starting and driving on a slope, will cause the problem of slow start of the vehicle or even a slippery slope, so a method for starting the engine of a hybrid vehicle power system is proposed to solve this problem

Method used

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  • Engine starting method of hybrid power vehicle power system
  • Engine starting method of hybrid power vehicle power system
  • Engine starting method of hybrid power vehicle power system

Examples

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Embodiment 1

[0025] A method for starting an engine of a parallel hybrid system of a hybrid vehicle according to an embodiment of the present invention includes the following steps:

[0026] Step 1. When the engine is stopped and the gearbox is not in neutral, the motor alone drives the vehicle to start, so that the vehicle speed reaches the set speed. When the driving speed of the vehicle reaches the set speed, the clutch starts to engage gradually. The engine shutdown state mentioned here usually means that the vehicle is in a parking state, or the engine is in an idling shutdown state. The gearbox is not in the neutral state, that is, the gearbox is not in neutral, for example, the gearbox can be set to 1st gear, 2nd gear or 3rd gear, and the specific gear setting can be adjusted according to the driving needs of the vehicle .

[0027] The gear shifting of the gearbox can realize the engine start control without power interruption during the driving process of the parallel hybrid syst...

Embodiment 2

[0033] figure 2A flowchart of an engine starting method for a parallel hybrid system of a hybrid vehicle according to an embodiment of the present invention is shown. At the beginning, the engine of the vehicle is in the idling stop state, the gearbox is not in neutral, and the vehicle is driven by the motor alone to start. When the driving speed of the vehicle reaches the set speed V0, the clutch starts to be gradually engaged and enters the engine start working mode.

[0034] The clutch engages quickly to the half-engagement point. Before the clutch is at the half-engagement point, the engine speed is zero because it does not transmit the torque of the motor; when the clutch reaches the half-engagement point, the clutch starts to transmit the torque of the motor, and the engine starts to run from zero speed.

[0035] When the engine speed is greater than zero, the clutch continues to be gradually engaged from the half-engagement point, which is a slow-speed engagement pro...

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Abstract

The invention discloses an engine starting method of a hybrid power vehicle power system. The method comprises the following steps: (1) when an engine is in a stop state and a gearbox is in a non-neutral state, and after a motor drives a vehicle to reach the set vehicle speed, a clutch is gradually joined; (2) the clutch is gradually joined to a half joint point, the engine begins to operate; (3) the clutch is continuously and gradually joined from the half joint point to enable the rotating speed of the engine to synchronize with the rotating speed of the motor; and the position of the clutch serves as a synchronization point; and (4) the clutch is continuously and gradually joined totally from the synchronization point; the engine and the motor perform the torque conversion; and the engine drives the vehicle to travel. The method solves the technical problem of reduction of power performance directly caused by a no-power driving state of the vehicle in the starting process because of shifting to a neutral gear in the engine starting process of the hybrid power vehicle power system.

Description

technical field [0001] The invention relates to the technical field of power systems of hybrid vehicles, in particular to an engine starting method of the power system of hybrid vehicles. Background technique [0002] One of the many promising technologies for improving vehicle fuel efficiency is the hybridization of conventional vehicle powertrains with an electric drive system consisting of one or more electric motors and a high-voltage battery. The auto industry is pouring money into the development of such hybrid powertrain concepts and architectures to accelerate the electrification of vehicles and the eventual shift to plug-in hybrid or electric vehicles. These hybrid system structures can be divided into three types, namely series hybrid systems, parallel hybrid systems and hybrid hybrid systems. [0003] figure 1 The structure of a parallel hybrid system of a hybrid vehicle is shown, and an engine, a clutch, a motor and a gearbox are coaxially connected through a t...

Claims

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Application Information

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IPC IPC(8): B60W20/00
CPCB60W20/40B60W10/02B60W10/08B60W2520/10B60W2710/023B60W2710/083
Inventor 刘溧苗壮韩晓晰
Owner BEIQI FOTON MOTOR CO LTD
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