Hybrid electric vehicle engine torque control method and system, and vehicle

Abstract

The invention provides a hybrid electric vehicle engine torque control method and system and a vehicle. A torque-based engine fuel injection control obtains a driver required torque according to a driver required torque map based on an accelerator pedal opening degree and an engine rotating speed; a motor power assisting control obtains a motor assistance torque value according to a motor assistance torque map based on a battery SOC value and a motor rotating speed. Under the high-power required working conditions such as vehicle starting acceleration or high-speed uphill and rapid acceleration overtaking, the actual torque output of the engine is reduced through the increase of the motor assistance torque value, and finally the real driver required torque is obtained. The fuel injection quantity of an engine is obtained through a torque and fuel injection quantity map, and the torque output and fuel injection quantity of high-power required working conditions such as vehicle startingacceleration or high-speed uphill and rapid acceleration overtaking are reduced through the assistance of the motor; the method and system can achieve the fuel saving purpose, and ensure the stable operation of the vehicle.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicle control, and in particular relates to a hybrid electric vehicle engine torque control method, system and vehicle. Background technique [0002] With the global energy shortage and environmental pollution caused by vehicle exhaust emissions becoming more and more serious, promoting new energy vehicles with low energy consumption and low emissions has become the consensus of all walks of life. At present, the third phase standard of "Fuel Consumption Limits for Heavy Commercial Vehicles" will be released soon , in which "in 2020, the fuel consumption limit will be tightened by about 15% on the basis of 2015" as the overall energy-saving goal. If the third-stage standard is implemented, it will be of great significance to my country's environmental protection, energy conservation and emission reduction, and the development of the commercial vehicle industry. However, considering the ...

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Problems solved by technology

[0005] The object of the present invention is to provide a hybrid electric vehicle engine torque control method, system and vehicle, which are used to solve the problem of hybrid electric vehicles caused by not combining torque-based engine fuel injection control and motor speed-based motor assist control in the prior art. The problem of poor fuel economy

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