Plug-in hybrid electric bus electromechanical coupling power steering system and its control method

Abstract

The invention discloses an electro-mechanical coupling power-assisted steering system for a plug-in type hybrid power bus and a control method thereof. According to the system, the characteristics of the plug-in type hybrid power bus are fully utilized, electro-mechanical coupling of an engine steering pump power-assisted steering system and an electric power-assisted steering system is achieved, and vehicle operation safety, whole bus energy saving and the bus operation requirements in a power battery failure mode are effectively achieved. According to the method, the characteristics of a configuration structure of the plug-in type hybrid power bus are fully utilized, the traditional engine steering pump power-assisted steering system and the electric power-assisted steering system are effectively coupled, double-channel power-assisted steering is achieved, the adopted control method can guarantee timely and reasonable work of traditional power-assisted steering and electric power-assisted steering, reliability of the whole bus is improved, energy consumption is reduced, and the requirements of mass production are met.

Description

technical field [0001] The invention relates to an electromechanical coupling power steering system of a plug-in hybrid electric bus and a control method thereof. Background technique [0002] Since the plug-in hybrid bus has two working modes of pure electric and hybrid, it is necessary to install an electric power steering system to ensure the steering requirements in pure electric mode. [0003] At present, the power steering of traditional bus products in China is generally powered by an engine-driven hydraulic pump, and the power steering of an electric bus is powered by a hydraulic pump driven by a power battery. For plug-in hybrid electric buses, both approaches appear to be feasible. However, if the traditional power steering system of the engine is still used, then even if the vehicle is in pure electric drive mode, the engine must be at idle speed, which still consumes fuel and cannot make full use of the power of the power battery, and the energy saving effect wi...

AI Technical Summary

Problems solved by technology

However, if the traditional power steering system of the engine is still used, then even if the vehicle is in pure electric drive mode, the engine must be at idle speed, which still consumes fuel and cannot make full use of the power of the power battery, and the energy saving effect will be reduced; Power assist, the power battery power must not only meet a certain mileage, but also need to provide part of the energy to supply the power booster motor, the energy of the power battery will increase, and the cost of the whole vehicle will increase.

At the same time, if the electric power assist fails at this time, there will be certain safety hazards if there is no backup power assist system

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