Automobile composite energy storage start-stop system capable of recycling braking energy

Abstract

The invention relates to an automobile composite energy storage start-stop system capable of recycling braking energy. The system comprises a storage battery, a motor subsystem, a super capacitor and a two-way buck converter. The motor subsystem comprises a motor and a motor controller. When an automobile performs braking, the automobile start-stop system can recycle and regenerate the braking energy. When the motor operates as a starter, namely a BSG mode, the motor controller can output electric energy in a two-way mode, an engine is started depending on the motor subsystem, electric energy of the super capacitor flows toward the motor subsystem, the motor controller works in an inversion state, and the motor outputs mechanical energy in an electric operation mode. According to the system, the super capacitor takes charge of a large-current discharge function needed for starting the engine, and large-current discharge of the storage battery is not needed, so that service life of the storage battery is greatly prolonged. In addition, due to the fact that the storage battery does not have the large-current discharge state, voltage is more stable and response time is shorter.

Description

technical field [0001] The invention relates to braking energy recovery, relates to a composite energy storage start-stop system for automobiles, in particular to a composite energy storage start-stop system for automobiles capable of recovering braking energy. Background technique [0002] In recent years, with the rapid increase of car ownership, energy and the environment are also under increasing pressure. The traditional automobile engine (internal combustion engine) starts slowly, and it is difficult to stop at idling speed, thus causing increased fuel consumption and exhaust emissions during idling. In order to optimize the starting and braking performance of automobiles and alleviate the pressure of automobile exhaust pollution on the environment, some automobile manufacturers have begun to research and develop automobile start-stop systems. Speed ​​(up to a few hundred milliseconds level), and then realize the engine shutdown function of the car under idling and ot...

AI Technical Summary

Problems solved by technology

[0003] However, the existing start-stop system still has the following deficiencies: multiple starts of the engine cause frequent high-current discharge of the battery, which seriously affects its life, making it difficult for ordinary batteries to meet the requirements of practical applications, and the use of high-end batteries such as lithium-ion batteries results in high system costs; The existing system cannot effectively recover and utilize the kinetic energy of the vehicle during braking, resulting in waste of braking energy

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