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

A hybrid power system and engine technology, applied in the field of vehicles, can solve problems such as poor performance and stability, poor user experience, and large vibration, and achieve the effects of avoiding noise and vibration, improving ride comfort, and preventing start-up shocks

Active Publication Date: 2022-03-29
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, when 12V is started, the noise is large and the vibration is also large, the vehicle's NVH (Noise-Vibration-Harshness, noise, vibration and harshness) performance and stability are poor, and the user experience is not good

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] 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 ).

[0068] 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 S308.

[0069] Step S302, when the engine start request is received, the current state of the first electric machine 2 is obtained.

[0070] In step S304, if the current state of the first electric motor 2 is failure, the current state data of the vehicle is obtained, and the current state data of the vehicle includes the current speed of the vehicle.

[0071] Step S306 , judging whether the current vehicle speed of the vehicle is less than or equal to a preset vehicle speed threshold and whether other current sta...

Embodiment 2

[0087] The difference between this embodiment and the first embodiment is that: when the waiting clutch start strategy is activated for clutch start, a pre-drag (prefill) torque strategy is executed for the clutch 3 .

[0088] refer to Figure 4 As shown, the method for starting the engine in the dual-motor hybrid system of this embodiment may at least include the following steps S402 to S412.

[0089] Step S402, when the engine start request is received, the current state of the first electric machine 2 is acquired.

[0090] Step S404, if the current state of the first motor 2 is failure, then obtain the current state data of the vehicle, the current state data of the vehicle at least includes the current speed of the vehicle.

[0091] Step S406 , judging whether the current vehicle speed of the vehicle is less than or equal to a preset vehicle speed threshold and whether other current state data of the vehicle meet the condition of waiting for clutch activation. If so, that ...

Embodiment 3

[0108] The difference between this embodiment and the first embodiment is that: when the waiting clutch start strategy is activated to start the clutch, the fuel injection time of the engine 1 is also targetedly controlled.

[0109] refer to Figure 7 As shown, the method for starting the engine in the dual-motor hybrid system of this embodiment may at least include the following steps S702 to S716.

[0110] Step S702, when the engine start request is received, the current state of the first electric machine 2 is acquired.

[0111] Step S704, if the current state of the first motor 2 is failure, then obtain the current state data of the vehicle, the current state data of the vehicle at least includes the current speed of the vehicle and the coolant temperature of the engine 1 (usually the coolant temperature of the engine 1).

[0112] Step S706, judging whether the current vehicle speed of the vehicle is less than or equal to the preset vehicle speed threshold and whether oth...

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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 dual-motor hybrid power system includes an engine, a first electric machine connected with the engine, and a clutch connected between the first electric machine and the transmission system. The starting method includes: when an engine starting request is received, acquiring the current state of the first motor; if the current state of the first motor is faulty, acquiring current state data of the vehicle, where the current state data of the vehicle includes the current vehicle speed of the vehicle; Determine whether the current speed of the vehicle is less than or equal to the preset speed threshold and whether other current state data of the vehicle meet the conditions for waiting for the clutch to start; if so, monitor the vehicle speed in real time until the vehicle speed is greater than the preset speed threshold and control the clutch dragging The engine starts. The invention can improve the NVH performance and stability of the vehicle when the engine is started.

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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