An Active Vibration Reduction Method for Power System Based on Engine Instantaneous Torque Observer

Abstract

The invention provides a power system active vibration-damping method based on an instant torque observer of an engine, and belongs to the field of electronic control of engines, motors or hybrid power systems. The power system active vibration-damping method includes that the engine operates according to set working conditions; under each working condition, a vehicle control unit acquires enginestate parameters and control parameters to add sensor signals; the instant torque observer of the engine acquires instant torque ripple signals of the engine through estimation of the parameters, thesensor signals and bent axle signals and sends the instant torque ripple signals to a motor controller; the motor controller calculates target harmonic torques, generates control signals and sends thecontrol signals to a motor; the motor generates corresponding harmonic torques according to the received control signals; the instant torques of the engine and the harmonic torques generated by the motor act on a drive shaft at the same time to achieve vibration damping of a power system. The power system active vibration-damping method has the advantages that additional hardware does not need tobe installed on the power system, the high-frequency harmonic torques added to the motor suppress the vibration of a transmission system, and the comfort level of driving a vehicle is improved.

Description

technical field [0001] The invention belongs to the field of electronic control of an engine, a motor or a hybrid power system, and particularly proposes an active vibration reduction method for a power system based on an engine instantaneous torque observer. Background technique [0002] The engine starting process is a key factor affecting the comfort of the driving process. Especially in the hybrid power system, the high fuel consumption condition of the engine (usually low speed, small load) and idle speed are canceled, and the electric motor can realize the quick start of the engine. Therefore, during the running of the hybrid vehicle, the engine frequently starts and stops. Therefore, reducing the vibration during starting is the key to ensure the comfort of hybrid vehicles. During the starting process, the vibration of the engine mainly comes from two aspects. First, before the engine ignites (fuel injection for a diesel engine, and spark plug ignition for a gasolin...

AI Technical Summary

Problems solved by technology

At the same time, the average torque cannot solve the high frequency problems of the hybrid system, such as vibration problems

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