Two-gear speed changing system and method of electric car and electric car

Abstract

The embodiment of the invention discloses a two-gear speed changing system and method of an electric car and the electric car. The two-gear speed changing system comprises a finished car controller, a speed changer controller and a gear shifting mechanism, wherein the finished car controller is used for collecting the rotation speed of a drive motor; the speed changer controller is used for generating a first-gear start instruction or a second-gear switch instruction or a first-gear switch instruction based on the rotation speed of the drive motor; and the gear shifting mechanism comprises a first-gear clutch and a second-gear clutch, the first-gear clutch is used for achieving engagement based on the first-gear start instruction or the first-gear switch instruction so that the car is switched to the first gear, and the second-gear clutch is used for achieving engagement based on the second-gear switch instruction so that the car is switched to the second gear. Through the implementation mode, the drive motor can work at a high-efficiency rotation speed range continuously, the energy consumption rate of the car is decreased, and accordingly both the acceleration time index and the highest car speed index are taken into consideration.

Description

technical field [0001] The invention relates to the technical field of automobiles, more specifically, to a second-speed transmission system and method of an electric vehicle and the electric vehicle. Background technique [0002] The latest national standard "Terms and Definitions of Vehicle and Trailer Types" (GB / T 3730.1-2001) has the following definition for a vehicle: a non-rail-mounted vehicle driven by power with 4 or more wheels, mainly used for : Carrying people and (or) goods; towing vehicles carrying people and (or) goods; special purpose. Energy shortages, oil crises and environmental pollution are intensifying, which have a huge impact on people's lives and are directly related to the sustainable development of the country's economy and society. All countries in the world are actively developing new energy technologies. [0003] As a new energy vehicle with reduced oil consumption, low pollution, and low noise, electric vehicles are considered to be an importa...

AI Technical Summary

Problems solved by technology

However, for electric vehicles with relatively high requirements on power and economy, it is difficult to balance the acceleration time index (such as 100km / h acceleration time index) and the maximum vehicle speed index

[0006] In addition, in existing electric vehicles, a single-speed ratio reducer without a P gear is basically used, and it is difficult to lock the vehicle transmission system when the parking brake fails, which may cause undesired movement, thereby reducing Parking brake safety

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