An electric transport vehicle and its motor brake parking method

Abstract

The invention discloses an electric transport vehicle and its motor brake parking method. By analyzing the state information of the electric transport vehicle when the electric transport vehicle stops on flat ground and slope roads, the heuristic rules for the smooth parking of the electric transport vehicle are determined. According to the After the signal fed back from the accelerator accelerator determines that the operator of the electric pallet truck has the intention to stop, the appropriate braking method can be selected according to the state information of the electric pallet truck and combined with heuristic rules, the braking torque can be adjusted in real time, and the electromagnetic brake can be controlled. It enables the vehicle to stop smoothly on flat ground or slopes. In addition, the electric pallet truck disclosed in the present invention includes: a motor driver, a motor, an electromagnetic brake and an accelerator accelerator; wherein, the motor not only provides the driving force, but also provides the braking force required for braking and parking, and the motor driver is driving and The braking state can be switched seamlessly, and the energy fed back during regenerative braking can charge the power battery, thus prolonging the vehicle's battery life.

Description

technical field [0001] The invention belongs to the technical field of motor drive, and more specifically relates to an electric transport vehicle and a method for braking and parking the electric vehicle. Background technique [0002] In recent years, electric pallet trucks have gradually replaced manual pallet trucks, appearing in logistics, factories and large supermarkets, etc., greatly improving the efficiency of cargo delivery and saving manpower and time. The driving power of the electric pallet truck comes from the electric motor, and there are two types of motors generally used in this occasion: brushed DC motor and brushless DC motor. At present, brushed DC motors have been developed for a long time and the technology is mature. There are a large number of electric pallet trucks driven by brushed motors in the market; brushless DC motors are in a stage of rapid development, because of their brushless structure, long life and maintenance-free And other outstanding ...

AI Technical Summary

Problems solved by technology

[0003] The existing parking methods of electric pallet trucks do not consider special operations such as parking on slopes, and even some manufacturers directly use the motor drivers used on electric bicycles for electric pallet trucks in order to save development costs. The parking brake effect is optimized, using simple free parking or complete open-loop control methods, without considering the characteristics of heavy loads and complex use environments of electric trucks. When going uphill or downhill, the vehicle will slide downhill, seriously The slippery slope will even endanger the personal safety of the operator, and there will be uncontrollable vehicle movement; secondly, after the slippery slope occurs, when the electromagnetic brake is locked at the end, there will be a large mechanical shock and vibration due to the vehicle still running at a relatively high speed and noise, and reduce the service life of mechanical components such as gearboxes

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