Braking energy recovery device and method for hybrid electric vehicle based on motor controllable speed increase

Abstract

A hybrid car braking energy recovery device and method based on motor controllable speed-raising. The device comprises a motor (1), a gear box (2) and a planetary gear train (3). A planetary gear set (32) is rotatably arranged on a planet carrier (33) in a sleeved mode, the planetary gear set (32) is distributed around a sun wheel (31) and engaged with the sun wheel (31), a gear ring (34) is arranged outside the planetary gear set (32) in a sleeved mode and engaged with the planetary gear set (32), and the planet carrier (33) is provided with a brake (4). The motor (1) is connected with an output shaft (21) of the gear box, the sun wheel (31) is fixed on the output shaft (21) of the gear box, a clutch (5) is arranged between the output shaft (21) of the gear box and the planet carrier (33), the gear ring (34) is fixedly connected with one end of an input shaft (7), and the other end of the input shaft (7) is connected with a driving shaft (61) of a wheel (6). In the present invention, by improving and actively controlling the structure of the planetary gear train, on the condition that rotating speed of the input end of the device is gradually decreased, the rotating speed of the output end of the device can be increased as required, so that the device drives a generator to speed up, thereby obtaining a bigger required braking countertorque and at the same time achieving the purpose of increasing recovery power generation current.

Description

technical field [0001] The invention relates to a hybrid electric vehicle, in particular to a device and method for efficiently recovering braking energy based on a controllable speed-up of a motor in a hybrid electric vehicle. Background technique [0002] In a new energy hybrid vehicle driven by an electric motor, the energy-saving effect of the vehicle is closely related to the ratio of the vehicle's kinetic energy converted into regenerative energy during braking. When a hybrid vehicle brakes, the more vehicle kinetic energy is converted into regenerative energy and stored, the more significant the energy saving effect will be. The braking process with recuperation of braking energy is called regenerative braking. [0003] The regenerative braking principle of new energy hybrid electric vehicles is as follows: figure 1 As shown, during the regenerative braking process of the vehicle, the control system of the vehicle converts the drive motor into a generator mode, and ...

AI Technical Summary

Problems solved by technology

At present, it has not been found that in the process of regenerative braking, hybrid vehicles use special devices to increase the speed of generators.

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