Vehicle control method, system and vehicle

Abstract

The invention discloses a method for controlling a vehicle. The method comprises the following steps that the driving mode and speed of the vehicle are detected; if the vehicle is in the hybrid power driving mode HEV and the speed is smaller than a first preset speed, the vehicle is controlled to get into an HEV low-speed power generation control strategy; if the vehicle is in the hybrid power driving mode HEV and the speed is larger than a second preset speed, the vehicle is controlled to get into an HEV high-speed power generation control strategy, and a range extender carries out power generation at the preset power generation power P4, wherein the second preset speed is larger than the first preset speed, and the power generation power P4 of the range extender under the HEV high-speed power generation control strategy is larger than that of the range extender under the HEV low-speed power generation control strategy. According to the method for controlling the vehicle in the embodiment, the driving mileage of the vehicle is increased when power needs are high, fuel consumption is relatively low, and good fuel economy is achieved. The invention further provides a system for controlling the vehicle and the vehicle.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a vehicle control method, system and vehicle. Background technique [0002] The range extender is usually composed of a small engine, a generator integrating power generation / drive, an engine controller, a generator controller, etc., which can supply power to the vehicle power battery or directly to the drive motor, thereby increasing the cruising range of the vehicle. In the related art, the vehicle controls the range extender under high-speed conditions, and the range extender is usually activated when the SOC value of the vehicle power battery is less than a certain value (for example, 30%). [0003] This method has the following disadvantages: the range extender starts and generates electricity only when the power demand of the vehicle is high (such as a high-speed working condition with a high speed) and the state of charge Soc of the power battery is small. The range e...

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Problems solved by technology

[0003] This method has the following disadvantages: the range extender starts and generates electricity only when the power demand of the vehicle is high (such as a high-speed working condition with a high speed) and the state of charge Soc of the power battery is small

The range extender has two working modes. First, it generates electricity with a large power to meet the power demand of the vehicle, but at this time the engine must be in the high-speed, high-torque working area. On the one hand, the engine is under heavy load. The vibration and noise are louder, on the other hand, the fuel consumption rate is high, the fuel economy is poor, and the fuel consumption is high

Second, reduce the engine speed and torque, select the appropriate power generation to ensure fuel economy, but the power generation is reduced, and because the vehicle is in a stage of high power demand, the state of charge of the power battery Soc is already relatively low (such as lower than 30%), in order to maintain the power demand, the power battery also needs to provide part of the electric energy for the drive motor, resulting in a short cruising range of the vehicle, which cannot meet the mileage requirement

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