The rapid development of motor controllers for tricycle
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s in recent years is unimaginable, the operation is becoming more and more 'foolFor example, the control of vehicle speed has been developed to 'cruise lock'; in terms of driving, some have both electric performance and power assist function. If it is switched to the power assist state, with the help of the chain tension force measuring device or the central axle torque sensor, as long as the pedal is used pedal, you can perform power assist or determine the size of the power assist. 1. Controller and protection function (1) Introduction to the controller Briefly speaking, the controller is composed of peripheral devices and the main chip (or single-chip microcomputer). Peripheral devices are some functional devices, such as execution, sampling, etc. They are resistors, sensors, bridge switch circuits, and devices that assist single-chip microcomputers or application-specific integrated circuits to complete the control process; single-chip microcomputers are also called microcontrollers. A memory, a decoder with a signal language conversion, a sawtooth wave generator and a pulse width modulation function circuit, and the power tube of the switching circuit can be turned on or off, and the conduction time of the power tube can be controlled by a square wave to control the motor speed. The drive circuit, input and output ports, etc. are integrated together to form a computer chip. This is the smart controller for electric bikes. It is a high-tech product in the form of a 'fool'. The design quality and characteristics of the controller, the function of the microprocessor used, the circuit of the power switch device and the layout of peripheral devices, etc., are directly related to the performance and operating status of the vehicle, and also affect the performance and efficiency of the controller itself. Controllers of different quality, used in the same vehicle and equipped with the same set of batteries in the same charge and discharge state, sometimes show great differences in driving ability. (2) The type of controller At present, the principle of the controller circuit used by electric bicycles is basically the same or similar. Most of brushed and brushless DC motors use the PWM control method of pulse width modulation to control the speed, but the difference in the selection of driving circuits, integrated circuits, switching circuit power transistors and some related functions. Differences in components and circuits make up the difference in controller performance. The controller is divided into two types in structure, we call it separate type and integral type. Separation The so-called separation means that the controller main body and the display part are separated, the latter is installed on the handlebar, and the controller main body is hidden in the body box or electric box, and is not exposed outside. In this way, the distance between the controller, the power supply and the motor is shortened, and the appearance of the car body is simple. The integrated control part is integrated with the display part and packed in a delicate special plastic box. The box is installed in the center of the handlebar, and the panel of the box has a number of small holes with a diameter of 4~5mm, and a transparent waterproof membrane is applied outside. There are light-emitting diodes in the corresponding positions of the holes to indicate the speed of the vehicle, the power supply and the remaining power of the battery.
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