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Method and device for starting engine in dual-motor hybrid power system, and vehicle

A hybrid power system and engine starting technology, applied in the field of vehicles, can solve problems such as uneven engine starting, excessive drag torque rise, shock, etc., and achieve the effects of improving starting smoothness, improving smoothness, and ensuring effectiveness.

Active Publication Date: 2022-04-08
ZHEJIANG GEELY HLDG GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, during the start-up process of the P1 motor or the clutch start-up, the drag torque of the P1 motor or the drag torque of the clutch C0 is directly increased to the maximum, causing the drag torque to rise too fast, causing an impact and causing the engine to start not smooth

Method used

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  • Method and device for starting engine in dual-motor hybrid power system, and vehicle
  • Method and device for starting engine in dual-motor hybrid power system, and vehicle
  • Method and device for starting engine in dual-motor hybrid power system, and vehicle

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Embodiment 1

[0057] The structure of the dual-motor hybrid system in this embodiment is as follows: figure 1 As shown, it includes an engine 1 , a first motor 2 connected to the engine 1 (namely the P1 motor), and a clutch 3 connected between the first motor 2 and the transmission system 5 (namely the clutch C0 ).

[0058] see image 3 As shown, the method for starting the engine in the dual-motor hybrid system of this embodiment may at least include the following steps S302 to S306.

[0059] Step S302, when the engine start request is received, the current status data of the vehicle is acquired.

[0060] Step S304, judging whether the pre-drag torque application condition is satisfied according to the current state data of the vehicle. If yes, execute step S306.

[0061] Step S306, generating a drag start signal and sending it to the target component to be driven by the engine 1, and controlling the target component to output a corresponding pre-drag (Prefill) torque within a set time ...

Embodiment 2

[0085] The difference between this embodiment and Embodiment 1 is: in the process of starting the engine 1 driven by the target component (the first motor 2 or the clutch 3), not only the target component is controlled within the set time period since receiving the drag start signal The corresponding pre-drag torque is output, and the fuel injection time of the engine 1 is controlled according to the coolant temperature of the engine 1 and the driver's intended start mode, so as to prevent the start of the engine 1 caused by early or late fuel injection Shock, failure to start or drop in engine speed and other phenomena, improve the smoothness and safety of engine 1 start.

[0086] refer to Figure 6 As shown, the method for starting the engine in the dual-motor hybrid system of this embodiment may at least include the following steps S602 to S612.

[0087] Step S602, when the engine start request is received, the current state data of the vehicle is obtained, wherein the cur...

Embodiment 3

[0113] The difference between this embodiment and Embodiment 1 is: before adopting the pre-drag torque strategy to start the engine 1, it is first judged whether the waiting clutch startup strategy can be enabled, so that even when the P1 motor fails and the vehicle speed is less than or equal to the preset vehicle speed threshold There is an engine start request, and the 12V start is not performed, but the clutch is started when the vehicle speed increases to greater than the preset vehicle speed threshold to meet the vehicle speed condition for clutch start.

[0114] refer to Figure 8 As shown, the method for starting the engine in the dual-motor hybrid system of this embodiment may at least include the following steps S802 to S814.

[0115] Step S802, when the engine start request is received, the current state of the first electric machine 2 is obtained.

[0116] Step S804, if the current state of the first motor 2 is failure, then obtain the current state data of the ve...

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Abstract

The invention provides a method and device for starting an engine in a dual-motor hybrid power system and a vehicle, belonging to the technical field of vehicles. The two-motor hybrid power system includes an engine, a first motor connected with the engine, and a clutch connected between the first motor and a transmission system. The starting method includes: when an engine starting request is received, obtaining the current state data of the vehicle; judging whether the pre-drag torque application condition is satisfied according to the current state data of the vehicle; if so, generating a drag start signal and sending it to the start the target component of the engine, and control the target component to output the corresponding pre-drag torque within a set period of time since receiving the drag start signal, wherein the target component is the first motor or the clutch. The invention can effectively improve the smoothness of starting the engine by adopting the pre-drag torque strategy.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a method and device for starting an engine in a dual-motor hybrid system and a hybrid vehicle. Background technique [0002] With the increasingly stringent requirements on vehicle fuel consumption and emission in various countries and the development of electrification systems, hybrid technology has become the key to energy saving and emission reduction of vehicles. Due to the complex battery technology and high cost of the current pure electric system, the hybrid system has been vigorously promoted. The dual-motor hybrid system is a high-efficiency hybrid system, and its general structure is as follows: figure 1 shown. Two-motor hybrid systems generally have three engine starting methods: 12V starter to drive the engine to start (referred to as 12V start), P1 motor to drive the engine to start (referred to as P1 motor start), and clutch C0 to drive the engine to start (refer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W10/06B60W10/02B60W10/08B60W30/20B60W20/15B60W30/18
CPCB60W10/06B60W10/02B60W10/08B60W30/20B60W20/15B60W30/18027B60W2030/203B60W2030/206Y02T10/62
Inventor 井俊超刘义强黄伟山左波涛杨俊赵福成王瑞平肖逸阁安聪慧
Owner ZHEJIANG GEELY HLDG GRP CO LTD
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