Integrated rear axle assembly with automatic gear shifting transmission for electric vehicle, and gear shifting method

Abstract

The invention discloses an integrated rear axle assembly with an automatic gear shifting transmission for an electric vehicle, and a gear shifting method. The integrated rear axle assembly comprises atwo-gear transmission rear axle assembly, a driving motor, a motor controller, a gear shifting executing mechanism assembly, a vehicle controller and a power system controller; and the driving motordrives a driving gear on a first shaft of the transmission, a high-gear gear and a low-gear gear on a second shaft are selected through a synchronizer, thus the driving gear on the first shaft and a driven gear on the second shaft are engaged, then a driving gear on the second shaft is engaged with a first gear of a differential mechanism to be in power linkage with the differential mechanism, then half shafts at the left ends and the right ends are linked with tires, and thus the vehicle is driven to operate. The high gear and the low gear of the vehicle can be freely switched, automatic gearshifting is achieved without a clutch through logic control, impact force and the energy loss in the gear shifting process are reduced, the endurance capacity of the electric vehicle is improved, themotor operation interval is optimized, meanwhile the gradeability and high traveling speed per hour are balanced, and pavement traveling in different regions and different states is convenient.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle rear axles, and in particular relates to a rear axle assembly of an integrated automatic shift transmission for electric vehicles. Background technique [0002] With the rapid development of the electric vehicle industry, in order to enhance the market's ability to resist risks, it is proposed that on the premise of continuing to stabilize and expand the development trend of light weight and increasing cruising range, the new energy vehicle industry can develop rapidly and diversify to improve the overall vehicle quality. The cruising range requirements meet the development needs of the new energy industry in the market. [0003] Electric vehicles must not only be environmentally friendly and energy-saving, but also improve the passability on complex roads, taking into account the coexistence of climbing and maximum speed requirements, realize the use of low-speed gears when climbing and ...

AI Technical Summary

Problems solved by technology

At present, most electric vehicles produced and sold on the market use the drive rear axle in the form of two-stage deceleration. The defect is that electric vehicles have only one deceleration ratio when driving on different road sections (such as flat roads and uphill). In the middle, the climbing ability is weak; when driving at high speed, the output torque of the motor and the high-speed operation of the motor and the reducer are sacrificed, and the load on the motor and the rear axle is relatively large. The running of the car consumes a lot of power, and even damages the motor, electronic control, battery system and other issues. A two-speed transmission with automatic shift function is designed and developed to package the integrated rear axle assembly.

Images