Electric automobile range increasing device based on internal combustion engine and mixed excitation motor

Abstract

The invention discloses an electric automobile range increasing device based on an internal combustion engine and a mixed excitation motor. The strength of a magnetic field generated by a traditional range increasing device based on a permanent magnet synchronous motor is difficult to adjust flexibly, and machine emission and fuel economy need to be improved. The electric automobile range increasing device comprises the internal combustion engine, the mixed excitation motor, a non-controlled rectifier, an inverter and a range increasing device controller. The internal combustion engine and the mixed excitation motor are in coaxial mechanical direct connection. A three-phase terminal of the mixed excitation motor is connected with a vehicle direct current bus through the non-controlled rectifier and the inverter. In the starting mode, the mixed excitation motor is made to reversely tow the internal combustion engine by utilizing the invert technology and magnetic field weakening control so as to start the range increasing device; and in the electricity generation mode, the mixed excitation motor is driven by the internal combustion engine to supply the power needed by a vehicle in the state that a power battery is lack of electricity to a drive motor through the non-controlled rectifier, and surplus electricity energy is used for charging the battery.

Description

technical field [0001] The invention mainly relates to an electric vehicle range-extending device based on an internal combustion engine and a hybrid excitation motor, which belongs to the field of new energy vehicles and is mainly used for emergency power supply and on-board charging when the power battery of a new energy electric vehicle is depleted, so as to prolong the continuous driving of the electric vehicle range while reducing battery recharge wait time by filling up with fuel. Background technique [0002] Limited by the technical level and manufacturing cost of the current battery, the range-extended hybrid electric vehicle is one of the most ideal models for the transition from traditional vehicles to future pure electric vehicles. By adding a set of internal combustion engine power generation or fuel cell power generation devices to the traditional electric vehicle platform, the range-extended hybrid electric vehicle not only retains the characteristics of energ...

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Problems solved by technology

[0004] (1) The permanent magnet synchronous motor relies on the permanent magnet to generate the air gap magnetic field required for electromechanical energy conversion. Once the motor is selected, the magnetic field strength generated by the permanent magnet is difficult to adjust flexibly, and the working speed of the internal combustion power generation range extender needs to follow the change of power generation demand Therefore, an additional output conditioning circuit is required to realize the adjustment of the output voltage, output current and power generation of the range extender, such as half-bridge rectification technology, PWM full-bridge rectification technology, bidirectional DC / DC, etc., resulting in higher control difficulty and control cost high

[0005] (2) Internal-combustion power generation range-extending devices usually need to perform frequent start-stops and switching of working conditions according to different power generation requirements. Although permanent magnet synchronous motors can use inverter technology to achieve high-idle start of the internal combustion engine of the range-extending device, reducing fuel consumption and emissions during the starting process, However, the field increase and field weakening based on the armature current vector control has great limitations and the motor boost inverter control is more complicated, so the adjustment of the target power generation condition of the range extender still needs to be realized by the transient control of the traditional internal combustion engine. Transient working conditions not only affect the emission and fuel economy of the whole machine, but also cause the response speed of the power generation of the range extender to slow down

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