In recent years, with the maturity of various technologies, many configurations on automobiles have been gradually enriched and popularized. Take ABS, it was a very high configuration in the past, and even some cars have the words ABS in the back, and now, almost all become the standard for every car. Speaking of configuration, there are a lot of people around to buy new cars recently, but I found that they are bothered by the two buttons on the car, that is, electronic handbrakes and automatic parking. So where are these two small buttons sacred, how do we use them? Let's listen to what the engineers say.
What is the electronic hand brake (EPB)?
The button with the "p" in the picture is the electronic handbrake, and the biggest highlight is the word "electronic". After stopping the car, you don't have to pick up your sleeves, clench your teeth, and pull the handle. You just need to gently lift the button and it's OK. You can't believe it, so elegant. It is really not sei anymore.
Closer to home, let's take a look at how the electronic hand brake works. There are some electronic handbrakes that control a motor to drive the reel through a switch, drive the cable to lock the rear wheel, and the structure is simple. It is not much different from the traditional mechanical handbrake. It can be understood as replacing the handle with a button, and Whether the rear wheel is caliper parking or drum parking is not affected, and it is easy to arrange, but the function is too single, and it is not mainstream.
At present, the more mainstream electronic handbrakes use integrated calipers, that is, the motor is integrated on the brake calipers, the zipper mechanism is eliminated, the hydraulic brake is used for the conventional service brake, and the motor brake is used for the parking brake. The need for an electronic circuit to intervene in the rear wheel brake system is relatively complicated. How to understand? That is, when you press the button, this signal propagates through a series, and finally the caliper of the rear wheel locks the wheel itself.
The integrated caliper can be divided into four parts: DC motor, speed reduction mechanism, screw nut mechanism and disc brake. When parking brake, the motor receives the signal from the ECU and then starts the output torque. The torque passes through the reduction gear (usually the pulley). And the planetary gear mechanism double-stage deceleration) after decelerating and increasing the torque, and then transmitted to the screw nut mechanism, the screw nut mechanism converts the rotary motion of the screw into a linear motion of the nut, and the linearly moving pressure nut pushes the brake piston to move. Then, the brake disc is pressed to achieve the parking brake effect.
The positive active material is mainly made of nickel, and the negative active material is mainly an alkaline battery made of cadmium.The nickel-cadmium battery used in AGV car has large internal resistance and can be used for large current discharge.Compared with other kinds of batteries, nickel-cadmium batteries can withstand overcharge or overcharge, and the operation is simple and convenient.The discharge voltage is somewhat different according to the discharge current. In general, the discharge termination voltage of about 1.2v nickel-cadmium battery is 1.0v /CELL, and the actual operating temperature ranges from -20 degrees to 60 degrees. In this range, the discharge can be repeated for more than 500 times.
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