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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 affecting the smoothness and safety of engine starting, engine speed drop, starting shock, etc., so as to improve the starting smoothness, avoid disturbance shock, and ensure response speed. Effect

Active Publication Date: 2022-03-29
ZHEJIANG GEELY HOLDING (GROUP) 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 of the P1 motor or the clutch start-up process, the engine usually begins to inject fuel when the drag torque of the P1 motor or clutch has not been unloaded, causing a start-up shock; If the fuel injection delay is set for a long time, it will cause startup failure or engine speed drop, which will seriously affect the smoothness and safety of engine startup

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

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Embodiment 1

[0065] 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 ).

[0066] 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.

[0067] Step S302, when the engine start request is received, the current state data of the vehicle is obtained, the current state data of the vehicle includes the coolant temperature of the engine 1 (usually the coolant temperature of the engine 1).

[0068] Step S304, judging the activation mode intended by the driver according to the current state data of the vehicle.

[0069] Step S306, according to the coolant temperature of the engine 1 and the starting mode of the driver's intention, determine the fu...

Embodiment 2

[0101] The difference between this embodiment and Embodiment 1 is that in the process of starting the engine 1 driven by the target component (the first motor 2 or the clutch 3), not only the fuel injection time of the engine 1 is targetedly controlled, but also the target component Execute a pre-drag torque strategy.

[0102] 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.

[0103] Step S402, when the engine start request is received, the current state data of the vehicle is obtained, wherein the current state data of the vehicle at least includes the engine 1 speed and the coolant temperature of the engine 1 (usually the coolant temperature of the engine 1).

[0104] Step S404, judging the activation mode intended by the driver according to the current state data of the vehicle.

[0105] Step S406, judging whether the pre-drag torque application conditi...

Embodiment 3

[0121] The difference between this embodiment and Embodiment 1 is that before starting the engine 1, it is first judged whether the waiting clutch start strategy can be enabled, so that even if there is an engine start request when the P1 motor fails and the vehicle speed is less than or equal to the preset vehicle speed threshold, the Instead of starting with 12V, the clutch is activated when the vehicle speed increases to a value greater than the preset vehicle speed threshold to meet the vehicle speed condition for clutch activation.

[0122] 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 S816.

[0123] Step S802, when the engine start request is received, the current state of the first electric machine 2 is obtained.

[0124] Step S804, if the current state of the first motor 2 is failure, then obtain the current state data of the vehicle, the current state...

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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 motor connected with the engine, and a clutch connected between the first motor and the transmission system. The starting method includes: when receiving an engine starting request, acquiring current state data of the vehicle, the current state data of the vehicle includes the coolant temperature of the engine; judging the starting mode intended by the driver according to the current state data of the vehicle; The starting mode of the fluid temperature and the driver's intention determines the fuel injection time of the engine corresponding to the target component to be dragged to start the engine, wherein the target component is the first electric motor or clutch; during the process of the target component dragging the engine to start The engine injects fuel at the determined injection time. The invention can improve the smoothness and safety of starting the engine.

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): B60W10/06B60W10/02B60W10/08B60W30/20B60W20/15B60W20/20B60W30/18
CPCB60W10/06B60W10/02B60W10/08B60W30/20B60W20/15B60W20/20B60W30/18027B60W2030/203B60W2030/206Y02T10/62
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 HOLDING (GROUP) CO LTD
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