Automotive terminology

engine anti-theft lock system

Because the door lock of the car has a certain mutual opening rate, the anti-theft function of the car is reduced, so people develop the engine anti-theft lock system.For cars that already have an engine lock system, thieves can't drive away even if they can open the doors.Typical engine anti-theft lock check system is how it works: inside the car ignition key is equipped with electronic chips, each chip inside with fixed ID (identification number), only the key chip ID in line with the ID on one side of the engine, the car to start, on the contrary, if inconsistent, car will automatically cut off the circuit immediately, make the engine can't start.

-42- air resistance coefficient (CD)

Due to the effect of air resistance, the car generates longitudinal, lateral and vertical air dynamic forces around the center of gravity of the car. Longitudinal air force is the largest air resistance, accounting for more than 80% of the overall air resistance.The air resistance coefficient is measured by a wind tunnel.

Because air resistance is directly proportional to the coefficient of air resistance, modern cars must consider reducing the coefficient of air resistance in order to reduce air resistance.

- 43 - wind tunnel

A wind tunnel is a pipe used to generate artificial air.The car wind tunnel tests are carried out in an area of the pipe where a uniform flow of air can be created.The fans used to generate strong airflow in the wind tunnel of cars are very large. For example, the diameter of the fans in the wind tunnel of mercedes-benz cars is 8.5m, the electric power of the driving fan is up to 4000kw, and the air flow rate in the fan used for the test stage of real cars is up to 270km/h.

-44- vehicle navigation system (GPS)

GPS is a radio navigation and positioning system based on 24 global positioning satellites, which provides information such as three position and three speed around the world all the time.

The automobile GPS navigation system is composed of two parts: one part is composed of GPS receiver and display device installed in the automobile workers;The other part consists of a computer control center, and the two parts are connected by positioning satellites.The computer control center is authorized and established by the motor vehicle management department, which is responsible for observing the dynamics and traffic conditions of the vehicles designated for monitoring in the jurisdiction at any time, because the whole vehicle navigation system has at least two functions: one is the vehicle track monitoring function.

-45- positioning cruise

Positioning cruise is used to control the constant speed of the car, once the car is set to cruise state, the fuel supply of the engine will be controlled by the computer, the computer will constantly adjust the fuel supply according to the road condition and the driving resistance of the car, so that the car always stays at the set speed, without the need to control the throttle.At present cruise control system has become the standard equipment of middle and high class cars.

-46- safety glass

Safety glass has two layers of tempered glass and laminated glass.Toughened glass is in the glass is in red-hot condition makes it rapid cooling and produces the glass with high prestress intensity, when toughened glass is broken, split into a lot of little pieces that do not have sharp edge, not easy to hurt people.

Sandwich glass has 3 layers in total, the middle layer of toughness and adhesion, impact damage when the inner layer and outer layer is still adhered to the middle layer, not easy to hurt people.The laminated glass used in cars, the middle layer of which is doubled in thickness, is widely used for its good safety.

-47- pre-tensioned seat belt

The characteristic of pretensioned seat belt is that at the moment of collision, when the passenger has not moved forward, it will first tighten the belt, immediately tie the passenger tightly to the seat, and then lock the belt to prevent the passenger from leaning forward, effectively protecting the safety of the passengers.The main role of pretensioning seat belt retractor and ordinary seat belt is different, in addition to the ordinary retractor retractable webbing function, also has when the speed changes sharply, can strengthen the binding force on passengers at about 0.1s, so it has a control device and pretensioning device.

-48- airbags (SRS)

Airbags are mainly composed of sensors, microprocessors, gas generators and airbags.Sensors and microprocessors are used to judge the loading degree, transmit and start signals;The gas generator generates the ignition action according to the signal indication, ignites the solid fuel and generates gas to inflate the air bag, which makes the air bag rapidly expand, and the air bag capacity is about 50~90L.At the same time, the air bag is equipped with a safety valve. When the air is inflated excessively or the pressure inside the bag exceeds a certain value, part of the gas will be released automatically to avoid squeezing the customer and injuring him.

In addition to the driver side of the airbag, some cars are installed in the front of the passenger airbag (that is, double airbag specifications), the passenger used and the driver used similar, the value of the airbag volume to be larger, more gas is needed.In addition, some cars have side airbags on the side of the seats near the door.

-49- intelligent airbag

The smart airbag is to add sensors on top of the normal model to detect whether the seat members are children or adults. What is the height of the seat belt they are wearing and the position they are in?Through the collection of these data, by electronic computer software analysis and processing control of the expansion of the airbag, make it play the best credit, avoid unnecessary expansion of the airbag, thus greatly improving its safety protection role.

-50- member head and neck protection system (WHIPS)

Usually set in the front seat.When the impact at the back of the car received, head and neck protection system can rapidly inflated, the entire back of a chair will be backward with a person, a person's safety and stability of the whole back and back to stick close together, back of a chair is poured after the meeting in order to minimize the head and the power of the former jilt, seat of the chair and the head will move backward level, make the upper part of the body and head, gently and evenly support and protection in order to reduce the impact of the spine and neck on, and to prevent the damage from the head thrown back.

-51- disc brake

Also known as disc brake, as the name suggests is to take its shape and named.It is controlled by hydraulic pressure, the main components are brake disc, pump, brake pliers and tubing.The brake disc is made of alloy steel and fixed to the wheels, which rotate with the wheels.The sub-pump is fixed on the floor of the brake is fixed, the two friction pieces on the brake clamp are installed on both sides of the brake disc, the piston of the sub-pump is transported by the oil pipe hydraulic rent, push the friction piece pressure to the brake disc friction brake, moving as if with pliers clamping the rotating plate, forcing it to stop.

Anti-lock braking system (ABS)

As is known to all, not a stamped on the die when braking, and should be step by step, a step on a pine, until the car stopped, but when you meet the emergency brake often need auto emergency stop,'d like a foot exactly the car to stop, because of the wheel are prone to embrace death at this moment, so that the car danger, such as the front wheel lock cause the car went out of the ability of turning, the rear wheel lock allows you to easily spin accidents, etc.

ABS is installed to solve the problem that the wheels are locked when braking. Cars equipped with ABS can effectively control that the wheels are kept in a rotating state without being locked, thus greatly improving the stability of the car when braking and the braking performance of the car under poor road surface conditions.

-53- electronic braking force distribution system (EBD)

EBD can automatically adjust the braking force distribution proportion of front and rear shafts to improve braking efficiency and improve braking stability with ABS according to the difference of axle load transfer in automobile braking.When a car brakes, four tires often adhere to different ground conditions.For example, sometimes the left front wheel and the right rear wheel are attached to the dry cement floor, while the right front wheel and the left rear wheel are attached to the water or mud water, this situation will lead to the braking of the car when the friction force of the four wheels and the ground is not the same, easy to cause skidding, tilt and rolling accident.

EBD with high-speed computer in the car braking moment, respectively to four tires to different the ground induction and calculated, it is concluded that different friction values, make four tires braking device according to different situations in different ways and power braking, and constantly high speed adjustment in the movement, so as to ensure the steady and safety of the vehicle.

-54- traction control system (TCS)

TCS is also known as the tracking control system.When a car brakes on a smooth road, the wheels slip and even turn into space and time.Similarly, when a car starts or accelerates rapidly, the driving wheels can slip and the steering can get out of control on smooth surfaces such as ice and snow.TCS is designed for this problem.

The TCS relies on electronic sensors to detect when the speed of the starting wheel is lower than that of the driving wheel (a characteristic of skidding), which sends a signal to adjust the ignition time, reduce valve opening, lower gear or brake the wheel so that the wheel no longer skidates.