Control method, hybrid system and vehicle

Abstract

The present invention proposes a control method, a hybrid power system and a vehicle, wherein the control method includes: obtaining vehicle speed, acceleration signal, braking signal and remaining power; determining the required power according to the vehicle speed, acceleration signal and braking signal; , remaining power and / or vehicle speed, determine the driving mode; determine the output power of the engine and the output power of the electric drive device according to the driving mode and the remaining power; determine the speed ratio of the continuously variable transmission, the speed or torque of the engine, The torque of the electric drive device; according to the speed ratio, the speed or torque of the engine, and the torque of the electric drive device, the vehicle is controlled. Through the technical scheme of the invention, the fuel saving rate of the hybrid power system is effectively improved, energy consumption is reduced, and the hybrid power system of the vehicle is beneficial to work with the best performance.

Description

technical field [0001] The present invention relates to the technical field of vehicles, in particular, to a control method, a hybrid power system, and a vehicle. Background technique [0002] Generally, a drive motor and an engine are installed in a hybrid vehicle. The work of the driving motor and the engine will be coordinated according to the set control method. Generally, the motor is used to drive or the motor is assisted to ensure that the engine avoids low-efficiency working conditions when the engine-driven vehicle is not efficient. When the engine drives the vehicle High-efficiency working conditions will use the engine to drive, and at the same time, when the engine is highly efficient, it will generate electricity and store part of the energy, and the stored electric energy will be used to drive the vehicle or assist the drive with the motor when the engine is not efficient. Of course, due to the differences in hybrid system architectures, in order to ensure opt...

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Problems solved by technology

[0003] In particular, due to differences in system architecture, some functional modes may be missing or cannot be covered under certain working conditions, or due to system limitations, the highest efficiency of the system cannot be exerted in some modes, and the corresponding control methods will also be limited and unable to Therefore, the control method of the hybrid power system is to achieve the highest efficiency of the system as much as possible under the corresponding system architecture

Moreover, the hybrid power system architecture of the prior art has some limitations, and the corresponding control method also has great limitations. For example, in some existing hybrid power systems, the entire transmission system has only one fixed transmission speed ratio. When the vehicle is running at a high speed, the engine cannot directly transmit power to the wheels through the transmission system. The driving force can only be the power output by the drive motor to the wheels. To drive the engine, it can only generate power through the generator motor and then provide power to the drive motor. In the middle The loss increases during the energy conversion process, which limits the fuel economy and reduces the fuel saving rate. In addition, under this working condition, because the power of the motor and the engine cannot be superimposed to drive the vehicle at the same time, in order to ensure the power of the vehicle under this working condition It is necessary to increase the torque and power of the motor, which is not conducive to the efficient operation of the motor and engine, and is also not conducive to improving the fuel saving rate of the engine.

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