Torque control method and device for Miller cycle engine

Abstract

The invention provides a torque control method for a Miller cycle engine. The method comprises the following steps that: an oil consumption emission Gaussian model is established; Miller cycle enginetorques, throttle opening degrees, air incoming VVT angles, ignition angles, corresponding instantaneous oil consumption and instantaneous pollutant emissions under different loads and rotating speedsare collected with a set engine working condition point sampling frequency, so that a Gaussian model of relationships among the Miller cycle engine torques, the throttle opening degrees, the air incoming VVT angles, the ignition angles, the instantaneous oil consumption and the instantaneous pollutant emissions is established; an optimization rule of torque control is established, specifically, an optimization rule of the target torque control of the Miller cycle engine is determined; and global optimization of a torque control strategy is performed, specifically, the target torque and parameter control target of the engine are determined according to the total required torque of the engine, the Gaussian model and the optimization rule. The invention further provides a torque control device for a Miller cycle engine. The oil consumption and pollutant emissions of the hybrid power Miller cycle engine are optimized through a Gaussian model prediction method.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a torque control method and device for a Miller cycle engine. Background technique [0002] Generally speaking, the design goals of control strategies for hybrid electric vehicles include: good fuel economy, low exhaust emissions, low cost, and system safety and stability. [0003] Most of the early hybrid vehicle control strategies were based on speed control, that is, using the speed as the control basis. When the vehicle speed is low, the engine is turned off and the motor drives the vehicle; when the vehicle speed is greater than the set value, the engine drives the vehicle alone; When the required driving force is greater than the maximum driving force provided by the engine, the engine and the electric motor jointly drive the car; when the vehicle speed is negative, the electric motor collects energy and stores it in the power battery pack. Although the speed-based hybrid ...

AI Technical Summary

Problems solved by technology

Although the speed-based hybrid electric vehicle control strategy is simple and the development of the controller is relatively easy, it cannot meet the design requirements of the hybrid electric vehicle controller due to its single control parameter and poor dynamic characteristics.

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