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Automatic gear locking method and system for electric vehicles

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: 2021-06-08
HUNAN CSR TIMES ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 for electric vehicles
  • Automatic gear locking method and system for electric vehicles
  • Automatic gear locking method and system for electric vehicles

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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 for an electric vehicle, which includes the following steps: detecting the basic parameters of the vehicle to obtain the operating conditions of the vehicle; estimating the slope value of the current road; determining whether the slope value of the current road is in the gear locking range; If it is not in the locked range, the gear shifting operation is prohibited, and if it is not in the locked gear range, the gear shifting operation is allowed. The automatic gear-locking method and system for an electric vehicle provided by the present invention can estimate road gradient parameters based on information such as motor actual torque, gear position, vehicle speed, etc., and can also calibrate at what threshold the gradient parameter needs to be locked and when to release the gear. And it can also calibrate the threshold through the vehicle controller to realize the automatic locking function. In addition, the automatic gear-locking method and system for electric vehicles provided by the present invention do not need too much modification of the hardware structure, and are all completed by software algorithms. The implementation cost is low, the cycle is short, and the implementation feasibility is high.

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 Patents(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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