A full working condition control method for a permanent magnet synchronous range-extending system

Abstract

The invention discloses a permanent magnet synchronous range extension system all-working-condition control method. Compared with starting conducted by a small start motor carried by an engine, starting conducted by a permanent magnet synchronous motor has the beneficial effects that the calibrated rotation speed of ignition oil injection of the engine is increased, and the situation that oil consumption emission is severe in the engine low-rotation-speed starting process is avoided. When a range extender enters in a first stage of the starting working condition, the actual torque of the permanent magnet synchronous motor responds to the target torque and is monotonically decreased to 0 Nm along with the increase of the rotation speed, the mode of the motor is switched into a power generation mode, and the actual torque of the motor is used for balancing the resistance torque of the engine in the process. Due to the fact that the target torque and the actual torque of the motor are reduced to 0 before the combustion torque of the engine is generated, and the control mode of the motor is switched to the power generation mode from an electric mode, so that after the engine starts generating power, the actual torque of the motor serves as the load of the engine to be gradually increased, the rotation speed is kept stable, and therefore, the smooth switchover of starting to an idlespeed working condition can be guaranteed when the output torque of the engine is suddenly increased.

Description

technical field [0001] The invention mainly relates to a method for controlling the full working conditions of a permanent magnet synchronous range-extending system, which belongs to the field of range-extending electric vehicle control, and is mainly used for the smooth transition between the start-up and power generation conditions of the range-extended electric vehicle, the power generation and shutdown conditions, and the During the power generation process, the speed and power are switched according to the demand. Background technique [0002] As various countries have introduced timelines for banning the sale of fuel vehicles, the process of electrification of vehicles has been further promoted. However, due to the bottleneck of pure electric vehicle batteries and charging technology, it cannot be broken through in the short term. Combined with my country's national conditions, gasoline-electric hybrids are used as a There is still a need for transitional choices. Sinc...

AI Technical Summary

Problems solved by technology

At present, most of the power generation conditions of the range extender adopt this configuration. The engine drives the generator to work at a fixed operating point and emits constant power. However, the range extender electric vehicle needs to cope with different driving situations. The power changes in real time, and the constant power emitted by the range extender means that the power that the battery pack needs to provide changes in real time, which increases the damage to the battery

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