Active vibration damping method for torsional vibration of engine-motor coupling system

Abstract

The invention provides an active vibration damping method for the torsional vibration of an engine-motor coupling system and belongs to the field of engine control. The method comprises the steps of firstly installing a torque sensor assembly applied to a hybrid engine; calculating the integrated output torque of a power system, the desired torque of the engine and the desired torque of an ISG (Integrated Starter Generator) motor by a vehicle control unit according to throttle opening signals at any time; obtaining the vibration damping torque of the ISG motor according to the difference valuebetween the desired torque and the actual output torque of the engine and obtaining the integrated output torque of the power system by combining with the desired torque of the ISG motor; and carrying out closed-loop control on the integrated output torque to obtain the control quantity of the ISG motor and realize active vibration damping. The method provided by the invention has the beneficialeffects that the torque fluctuation of the power system can be reduced; the torsional vibration of a drive system is reduced; and the risk that a shaft system of the drive system is broken due to thevibration is reduced.

Description

technical field [0001] The invention belongs to the field of engine control, and particularly proposes an active damping method for torsional vibration of an engine-motor coupling system. Background technique [0002] The power of the piston engine is intermittent, and the output torque has the property of pulse. The fluctuating output torque causes the torsional vibration of the shafting of the power system. In a hybrid system, the engine and the electric motor are connected to output power together. The torque response speed of the motor is fast, and it can quickly respond to the torque command given by the control strategy. This provides the possibility to solve the problem of torsional vibration. [0003] In the prior art, shock absorption is usually achieved through two methods. One is to add a torsional shock absorber between the engine and the ISG motor, which reduces vibration through physical means. The problem with this method is that the torsional damper reduc...

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Problems solved by technology

Another method is to reduce the torque change rate of the ISG motor and reduce the vibration by reducing the system response. However, the slow system response will weaken the power performance

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