Control method and device for range-extending type vehicle engine

Abstract

The invention relates to the car field, and discloses a control method and a control device for a range-extending type vehicle engine. The control method comprises the following steps: obtaining vehicle speed in a vehicle travelling process after starting a range extender; when the vehicle speed is lower than a threshold value, controlling rotation speed of the engine according to a preset relational table and the vehicle speed, so that the rotation speed of the engine is not greater than a maximal rotation speed value corresponding to the vehicle speed, wherein a corresponding relationship of the vehicle speed and the maximal rotation speed value is recorded in the relational table; and when the vehicle speed is greater than the threshold value, controlling the rotation speed of the engine to be kept at the preset optimal economic rotation speed. According to the control method, the rotation speed of the engine is reasonably controlled in the vehicle travelling process, and NVH (noise vibration and harshness) performances are taken into consideration of engine rotation speed control indexes, so that charging efficiency, oil consumption and NVH performances can be coordinated with one another, thereby improving comprehensive performances under a range-extending state of an electric vehicle, and improving comfortable sensation of people in the vehicle.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method and device for controlling an engine of a range-extended vehicle. Background technique [0002] The control of the engine speed of the existing range-extended electric vehicle is mainly to improve the charging performance (charging efficiency and charging rate), and seldom considers the NVH (Noise, Vibration, Harshness) performance. When the car is in pure electric mode, that is, when the range extender is not activated, because there is no excitation source such as the engine and exhaust system, the NVH level in the car is generally higher than that of a traditional internal combustion car, which belongs to a relatively quiet environment. [0003] However, due to the existing battery technology factors, the cruising range of the vehicle under pure electric working conditions is insufficient. Control the speed and torque (power) of the range extender. If the speed / torque is t...

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Problems solved by technology

[0002] The control of the engine speed of the existing range-extended electric vehicle is mainly to improve the charging performance (charging efficiency and charging rate), and seldom considers the NVH (Noise, Vibration, Harshness) performance. When the car is in pure electric working condition, that is, when the range extender is not activated, the NVH level in the car is generally higher than that of traditional internal combustion vehicles because there is no excitation source such as the engine and exhaust system, and it belongs to a relatively quiet environment.

[0003] However, due to the existing battery technology factors, the cruising range of the vehicle under pure electric working conditions is insufficient. Control the speed and torque (power) of the range extender. If the speed / torque is too low, the power generation will not be enough to achieve the purpose of range extension. If the speed is too high or there is a sudden change, the NVH performance in the car will be poor, which will cause serious damage to the car. Personnel causing severe discomfort

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