A large transmission ratio interval shift control method for series electric transmission vehicles

Abstract

The invention relates to a control method for a high-transmission-ratio spaced shifting of a tandem type electric transmission vehicle. The method comprises an upshifting control process and a downshifting control process, during upshifting, a transmission comprehensive controller sends a separation command to a control valve of a brake of a speed change mechanism; the rotational speed of a planet carrier of the speed change mechanism and the rotational speed of a motor are obtained, so that a speed difference of an active edge and a passive edge of a clutch is obtained; and a rotational speed regulating command is sent to a motor controller, the speed difference is reduced, and when the speed difference is not greater than a limit value, the clutch is jointed; during downshifting, the transmission comprehensive controller sends the rotational speed regulating command to the motor controller, so that the rotational speed is lowered to about a shifting point, and the transmission comprehensive controller sends the separation command to the control valve of the clutch of the speed change mechanism; the rotational speed of the planet carrier of the speed change mechanism, the rotational speed of the motor and the rotational speed of a gear ring of the speed change mechanism are determined to obtain the speed difference of the active edge and the passive edge of the brake; the rotational speed regulating command is sent to the motor controller, the rotating speed difference is reduced, and when the rotating speed difference is not greater than a limit value, the clutch is jointed. The method covers a needed vehicle speed range, and satisfies the requirement of the largest output torque of the vehicle.

Description

[0001] Technical field: [0002] The invention relates to an interval shift control method, and more particularly to a large transmission ratio interval shift control method for a series electric transmission vehicle. [0003] Background technique: [0004] In the field of vehicle control, the use of electric motor speed regulation can realize continuously variable transmission of electric drive vehicles. However, the driving conditions of the vehicle are complicated. Although the motor speed range is large and can cover the required vehicle speed range, it cannot meet the maximum output speed of the vehicle. Moment requirements. Therefore, it is necessary to provide a planetary transmission mechanism with at least two gears in the electric transmission device to meet the requirements of output speed and torque at the same time. Considering the field weakening ratio of the motor, the two-gear transmission ratio interval of the transmission mechanism is usually larger, which is gener...

AI Technical Summary

Problems solved by technology

[0005] Due to the relatively large transmission ratio interval between the two gears, the speed difference between the active and passive sides of the shifting control member is very large, resulting in an increase in the sliding friction work during the shifting process, resulting in a very large temperature rise of the friction plate of the control member, which is prone to Ablation, so it is necessary to carry out shift control with large transmission ratio intervals

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