Speed changing device, gear-shifting control method, electric car driving system and electric car

Abstract

The invention relates to a speed changing device used for a drive system. The speed changing device comprises a planetary gear mechanism including a sun gear and a gear ring, at least one planetary gear meshed between the sun gear and the gear ring, a planet carrier and a gear-shifting mechanism; the sun gear, the planet carrier and the gear ring are configured to be an active component, a drivencomponent and a passive component correspondingly, wherein the active component is driven by the drive system, and the driven component is used as output of the speed changing device; and the gear-shifting mechanism includes a first gear-shifting assembly and a second gear-shifting assembly, the first gear-shifting assembly and the second gear-shifting assembly each include a sliding friction engagement element and a mechanical engagement element which cooperate with each other, each sliding friction engagement element is configured to execute the gear shifting process and achieve release after the gear shifting process is ended, and each mechanical engagement element is used for keeping the gear state after the gear-shifting process is completed and achieving release in the gear-shiftingprocess; and in the engaged state of the first gear-shifting assembly, the passive component is locked, and in the engaged state of the second gear-shifting assembly, the passive component and the driven component are engaged.

Description

technical field [0001] The present application relates to a transmission system, in particular, to a speed change device of a drive system and a shift control method. In addition, the present application also relates to an electric vehicle drive system and an electric vehicle. Background technique [0002] At present, electric passenger vehicles generally use a drive motor coupled with a single speed ratio reducer to output power to the wheels, but a single speed ratio reducer cannot give full play to the power and economy of the vehicle at the same time. In the case of a certain drive motor, in order to meet the power requirements, the speed ratio of the reducer needs to be greater than a certain value, and in order to meet the maximum speed or to obtain the best power economy etc.), the speed ratio of the reducer needs to be lower than a certain value, so the use of a single speed ratio reducer usually cannot have both the power performance and the economy of power consum...

AI Technical Summary

Problems solved by technology

[0002] At present, electric passenger vehicles generally use a drive motor coupled with a single speed ratio reducer to output power to the wheels, but a single speed ratio reducer cannot give full play to the power and economy of the vehicle at the same time

In the case of a certain drive motor, in order to meet the power requirements, the speed ratio of the reducer needs to be greater than a certain value, and in order to meet the maximum speed or to obtain the best power economy etc.), the speed ratio of the reducer needs to be lower than a certain value, so the use of a single speed ratio reducer usually cannot achieve both the power performance and power consumption economy of electric vehicles

At present, a small number of electric vehicles have adopted two-speed transmissions to balance the power and energy consumption of electric vehicles. If a synchronizer or other mechanical shifting components are used to realize the shifting process during the shifting process of the transmission, there will be The problem of power interruption during the shifting process; and the use of wet clutches as shifting elements has the problem of high energy loss caused by maintaining the high pressure of the oil pump during the gear holding period

Images