Engine starting control method and device for hybrid electric vehicle

Abstract

The invention relates to an engine starting control method and device for a hybrid electric vehicle, wherein the control method comprises the steps: a basic clutch torque capacity and a clutch torquecapacity adjustment amount are determined when an engine is started, wherein the basic clutch torque capacity is determined according to the resistance torque of the engine, and the clutch torque capacity adjustment amount is determined according to clutch torque capacity used for historical starting of the engine; according to the basic clutch torque capacity and the clutch torque capacity adjustment amount, the target clutch torque capacity used for starting the engine this time is calculated; and the torque of the clutch is controlled based on the target clutch torque capacity, so that thespeed of the engine is adjusted to a threshold rotating speed, and the threshold rotating speed is the rotating speed required for starting the engine. Therefore, good drivability of engine starting can be achieved while the engine is successfully started.

Description

technical field [0001] The present disclosure relates to the technical field of hybrid electric vehicles, in particular to a method and device for controlling engine startup of a hybrid electric vehicle. Background technique [0002] A hybrid vehicle includes an engine, a drive motor, and a clutch (this clutch is also called "P2 clutch") provided between the engine and the drive motor. The starting process of the engine includes: the clutch is partially engaged to transmit torque to the engine, thereby adjusting the engine speed to a threshold speed required for engine start; when the engine speed is adjusted to the threshold speed, the engine starts (ignites). In the related art, method 1 and method 2 (methods 1 and 2 will be described respectively later) may be used to start the engine. [0003] figure 1 A schematic diagram showing the effect of using method 1 to start the engine. Such as figure 1 As shown in , the clutch is fully open when the engine start request is ...

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Problems solved by technology

[0006] However, since the clutch torque capacity is PI-controlled based on the rotational speed difference between the engine target rotational speed and the engine rotational speed, the clutch torque capacity changes (ie, the clutch torque capacity oscillates) as the rotational speed difference changes, which will Affects drivability on engine start

Therefore, with method 2, good drivability with engine starting may not be achieved

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