Method for controlling stroke lengthening of serially connected pluggable electric vehicle

Abstract

The invention provides a method for controlling stroke lengthening of a serially connected pluggable electric vehicle. The system adopted by the method consists of an engine, a control unit EMS of the engine, a generator, a controller IPU of the generator and a whole vehicle controller HCU. The controlling method comprises the following steps of: (1) setting starting conditions of a stroke lengthening module; (2) starting the stroke lengthening module; and (3) controlling operation of the stroke lengthening module. In the method, a small starting motor which starts the engine can be saved, the engine can be directly started by the generator with high efficiency so as to reduce cost and save arrangement space of parts and components, simultaneously a command is sent to the IPU through the HCU to ensure the generator starts the engine, so that the success rate of one-time start is higher, and the starting effect and the communication command are simpler compared with those obtained whenthe small starting motor starts the engine. Meanwhile, in the method, several operation points with better economy can be selected on an external characteristic curve of the engine so as to reduce energy consumption and meet the requirement of electricity utilization of the whole vehicle.

Description

technical field [0001] The invention belongs to the field of vehicle system control, and in particular relates to a start-up and operation control method of a range-extended driving module. Background technique [0002] Energy crisis and environmental deterioration are two major factors restricting economic development. Research on energy-saving and environmentally friendly new energy vehicles is one of the effective means to solve the above problems, among which series plug-in electric vehicles are currently the hot spot of research and development. The main principle of the electric vehicle is: the driving motor is powered by the lithium battery to drive the vehicle. When the energy of the lithium battery is insufficient, the engine needs to be started to drive the generator to generate electricity, and the electricity generated is used to drive the motor to keep the vehicle running. The engine, generator, engine control unit EMS, and generator controller IPU are collecti...

AI Technical Summary

Problems solved by technology

In the existing technology, most of them set a point as the point where the engine generates power. Although the setting of this point is economical, it cannot meet the torque requirements of other working conditions of the vehicle.

When the vehicle has a large torque demand, it cannot meet the power demand of the vehicle

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