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Automatic gear locking method and system of electric vehicle

An electric vehicle and automatic technology, applied in multi-gear ratio transmissions, transmission components, vehicle parts, etc., can solve problems such as aggravating the wear of transmission parts and affecting driving comfort, and achieves high feasibility, low implementation cost, and short cycle time. Effect

Active Publication Date: 2019-03-19
HUNAN CSR TIMES ELECTRIC VEHICLE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only seriously affects driving comfort, but also increases the wear and tear of transmission components

Method used

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  • Automatic gear locking method and system of electric vehicle
  • Automatic gear locking method and system of electric vehicle
  • Automatic gear locking method and system of electric vehicle

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] In order to solve the problem of climbing and shifting cycles of Automated Manual Transmission (AMT) models, the existing AMT models are mainly solved by adding a manual lock function. When the manual lock is turned on, AMT gear shifting is prohibited, that is, when climbing a steep slope, you can manually lock it in the first gear, and let it climb in the first gear all the time.

[0038] However, this method has certain limitations, that is, the gear needs to be manually locked before climbing, and the gear needs to be released when the road is flat, which increases the driving intensity of the driver.

[0039] Therefore, the present invention provides a method and system for automatic gear locking of electric vehicles. The road gradien...

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Abstract

The invention provides an automatic gear locking method of an electric vehicle. The method comprises the steps of: detecting basic parameters of the vehicle to obtain operation working conditions of the vehicle; estimating a slope value of a present road; determining if the slope value of the present road is located in a gear locking range; if so, prohibiting the gear shifting operation; and if not, allowing the gear shifting operation. The automatic gear locking method and system of the electric vehicle can estimate road slope parameters through such information as actual motor torque, gear and vehicle speed, can calibrate the slope parameters to know the time of gear locking and the time of gear unlocking, and can calibrate a thread through an overall vehicle controller to achieve the automatic gear locking function. In addition, the automatic gear locking method and system of the electric vehicle need less excessive hardware structure change, use software algorithms for completion,and are low in implementation cost, short in period and high in implementation feasibility.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to an automatic gear locking method and system for electric vehicles. Background technique [0002] There are generally two driving modes for pure electric buses: direct drive and driving with electromechanical automatic transmission (Automated Manual Transmission, referred to as AMT). The power of the direct drive system is directly output from the motor to the rear axle, and its structure is simple and reliable. In the AMT system, the motor torque is output to the rear axle through the gearbox, and the power and economy can be optimized by changing the speed ratio. With the maturity of AMT technology, AMT system has been widely used in the field of pure electric buses. [0003] The AMT system determines the best gear position based on parameters such as vehicle speed, accelerator, and driver commands, and controls the clutch separation and engagement, the shift handle'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/22F16H59/66F16H61/02
CPCF16H61/0213F16H61/22F16H2059/663F16H2200/0021
Inventor 王炯王文明文多宋超李双龙文健峰丁文李勇华
Owner HUNAN CSR TIMES ELECTRIC VEHICLE
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