Driving control method in four-wheel drive mode of hybrid four-wheel drive vehicle

Abstract

The invention discloses a method for drive control over a hybrid four-wheel drive vehicle in a four-wheel drive mode. The method comprises the following steps of: judging whether the vehicle is in a four-wheel drive state or not; determining a moment of force currently required by the movement of the whole vehicle, and proportionally allocating the moment of force to an engine and a motor; calculating the efficiency of the engine and the motor under a gear change-free condition and a gear change condition respectively; multiplying the efficiency of the engine under the gear change-free condition and the gear change condition by using the efficiency of the motor under the gear change-free condition and the gear change condition respectively, and taking a maximum value; and controlling a first transmission and a second transmission to act according to the gear change conditions, which correspond to the obtained maximum value, of the engine and the motor. According to the method for the drive control over the hybrid four-wheel drive vehicle in the four-wheel drive mode, the efficiency of the whole vehicle under a hybrid drive working condition is optimal.

Description

technical field [0001] The present invention relates to a driving control method of a device of a hybrid four-wheel drive vehicle, and in particular to a driving control method of a hybrid four-wheel drive vehicle in a four-wheel drive mode. Background technique [0002] In order to cope with the energy shortage, people pay more and more attention to new energy vehicles. Among new energy vehicles, hybrid vehicles are expected to be the first models to be industrialized. [0003] There are several types of hybrid vehicles, one of which is a real four-wheel drive scheme in which the front axle of the car is driven by the engine and automatic transmission, and the rear axle of the car is driven by an electric motor and automatic transmission. For this type of hybrid vehicle, in the pure electric drive mode, the motor works in the most efficient area through the control of the rear transmission; in the pure engine drive mode, the engine is controlled by the front transmission ...

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Problems solved by technology

[0004] Both of these two control schemes have problems. When the engine efficiency is optimal, the motor efficiency may not be optimal; and when the motor efficiency is optimal, the engine efficiency may not be optimal, which may lead to increased fuel consumption of the engine. and emission deterioration

[0005] Therefore, these two control schemes are not ideal enough, without considering the overall efficiency of the engine and motor

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