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How much do you know about the basics of cars?

Public number: Pingliang FAW-Volkswagen Source: Time: 2020-02-21 01:37:40

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  1. Body length / width / height (mm): It is the distance between the two vertical planes that are perpendicular to the longitudinal symmetrical plane of the vehicle and abut on the front and rear outermost parts of the car, which is simply the length of the car The distance between the extreme points in the direction.  Vehicle width (mm): The width of the vehicle is the distance between two planes parallel to the longitudinal symmetrical plane of the vehicle and abutting the fixed protruding parts on both sides of the vehicle, in short, the distance between two extreme points in the width direction of the vehicle.  Vehicle height (mm): car height, is the vehicle ... "> 1. Body length / width / height vehicle length (mm):  
 It is the distance between two vertical planes perpendicular to the longitudinal symmetry plane of the vehicle and abutting on the outermost protruding parts of the front and rear of the car, simply the distance between the two extreme points in the length direction of the car.  
 Vehicle width (mm):  
 The width of a car is the distance between two planes parallel to the longitudinal symmetry plane of the vehicle and respectively abutting the fixed protruding parts on both sides of the vehicle, simply the distance between two extreme points in the width direction of the car.  
 Vehicle height (mm):  
 The height of a car is the distance between the support plane of the vehicle and the horizontal plane against which the highest protruding part of the vehicle abuts. In short, it is the distance from the ground to the highest point of the car.  

 2. Displacement:  
 The volume of space through which the piston moves from top dead center to bottom dead center is called the cylinder displacement. If the engine has several cylinders, the sum of the working volumes of all the cylinders is called the engine displacement.  

 3. Power:  
 Power refers to the work that an object does in a unit of time.  The higher the power, the higher the speed, and the higher the maximum speed of the car. The maximum power is often used to describe the dynamic performance of the car.  The maximum power is generally expressed in horsepower (PS) or kilowatts (kw). One horsepower is equal to 0.735 kilowatts.  

 4. Engine type:  
 Refers to the characteristics of the power plant, such as fuel type, number of cylinders, displacement and static braking power.  Engines installed on passenger cars or multi-purpose passenger cars are marked with the professional engine manufacturer, model and production number in accordance with regulations.  The most common is to classify by engine arrangement and cylinder number. There are W-type 12-cylinder engines, V-type 12-cylinder engines, W-type 8-cylinder engines, V-type 8-cylinder engines, opposed 6-cylinder engines, and V-type 6-cylinder engines. , Inline 5-cylinder engine and Inline 4-cylinder engine.  

 5. Torque:  
 Torque is the force that causes an object to rotate.  Engine torque refers to the torque output by the engine from the crankshaft end.  Under the condition of fixed power, it is inversely proportional to the engine speed. The faster the speed, the smaller the torque, and vice versa. It reflects the load capacity of the car in a certain range.  

 6. Automotive transmission:  
 By changing the transmission ratio and turning the engine crankshaft, it adapts to the different requirements of driving wheel traction and speed under different driving conditions such as starting, accelerating, driving, and overcoming various road obstacles.  Popularly divided into manual transmission (MT), automatic transmission (AT), manual / automatic transmission, continuously variable transmission.  

 7. Maximum speed (km / h):  
 The best speed a car can reach on a good level road.  

 8. Wheelbase (mm):  
 Axial moment is the distance between two vertical lines passing through the midpoint of two adjacent wheels on the same side of the vehicle and perpendicular to the longitudinal symmetry plane of the vehicle. In short, it is the distance from the center of the front axle of the car to the center of the rear axle.  
 9. Acceleration time:  
 The acceleration performance of the car, including the car's starting acceleration time and overtaking acceleration time.  On-site acceleration time means that the car starts from the first gear in a stationary state, and gradually shifts to high gear with the maximum acceleration intensity (including selecting the most appropriate shift timing), and then reaches a predetermined distance at a speed or speed The time required.  At present, the time (seconds) required for 0-96KM is commonly used for evaluation.  Overtaking acceleration time, the time required to accelerate to full speed with the highest or second highest gear.  The shorter the acceleration time, the better the acceleration of the car, and the power of the vehicle will be improved immediately.  

 10. Wheelbase:  
 Is the distance between the centerlines of the trajectories left by the wheels on the vehicle support plane (generally the ground).  If the two ends of the axle are two wheels, the track distance is the distance between the two center planes of the two wheels.  
 The track of a car is divided into the front track and the rear track. The front track is the distance between the center planes of the two front wheels and the rear track is the distance between the center planes of the two rear wheels. The two can be the same. There can also be differences.  
 Generally speaking, the wider the track, the higher the driving comfort, but some domestic cars do not have direction assistance. If the front track is too wide, the steering wheel will be "heavy" and affect the driving comfort.  
 In addition, the track length has an impact on the overall width, weight, lateral stability and safety of the car.  
 Generally speaking, the larger the wheelbase, the more favorable it is for the smoothness of handling, and also for the body shape and the spaciousness of the cabin, and the better the lateral stability.  However, the track width is wide, and the total width and weight of the car are generally increased, and the problem of dumping mud to the side of the vehicle body is easy to occur.  If the track is too wide, it will also affect the safety of the car. Therefore, the track should be adapted to the width of the vehicle body.

 Power performance and fuel economy indicators 1. Number of cylinders:  
 There are 3, 4, 5, 6, 8, 10, and 12 cylinders commonly used in automobile engines.  Three-cylinder engines are commonly used for engines with a displacement of less than 1 liter. Four-cylinder engines are generally used for 1 to 2.5 liters, 6-cylinder engines for about 3 liters, 8-cylinder for about 4 liters, and 12-cylinder engines for 5.5 liters or more.  Generally speaking, with the same cylinder bore, the more cylinders, the larger the displacement, and the higher the power; under the same displacement, the more cylinders, the smaller the cylinder bore, the higher the rotational speed, and thus the greater the lifting power.  

 2. Compression ratio:  
 It is the degree to which the engine mixture is compressed, expressed as the ratio of the total volume of the cylinder before compression to the volume of the cylinder after compression (that is, the volume of the combustion chamber).  The compression ratio has a lot to do with the performance of the engine. The usual low-pressure compression ratio refers to a compression ratio below 10 and a high compression ratio above 10. Relatively speaking, the higher the compression ratio, the greater the engine's power.  

 3.Cylinder bore × stroke:  
 It is the displacement of a single cylinder, and then multiplied by the number of cylinders, the product obtained is the displacement of the engine.  

 4. Main reduction ratio:  
 Have a greater impact on the vehicle's power performance and fuel economy.  Generally speaking, the larger the main reduction ratio, the stronger the acceleration performance and the climbing ability, but the worse the fuel economy.  However, if it is too large, the full power of the engine cannot be used to reach the due speed.  The smaller the main reduction ratio, the higher the maximum speed and the better the fuel economy, but the worse the acceleration and climbing ability.  

 5.EGR (exhaust gas recirculation):  
 The engine control computer, that is, the ECU, controls the solenoid valve to open in a timely manner according to the engine speed, load (throttle opening), temperature, intake air flow, and exhaust temperature. The vacuum of the intake pipe enters the EGR valve vacuum membrane chamber through the solenoid valve. The tie rod opens the EGR valve, and a small part of the exhaust gas in the exhaust gas enters the intake system through the EGR valve, and after mixing with the mixed gas, enters the cylinder to participate in the combustion.  A small amount of exhaust gas enters the cylinder to participate in the combustion of the mixed gas, which reduces the temperature in the cylinder during combustion. Since NOX is generated under high temperature and oxygen-rich conditions, the generation of NOX is suppressed, thereby reducing the content of NOX in the exhaust gas.  However, excessive exhaust gas participation in recirculation will affect the ignition and performance of the mixed gas, thereby affecting the engine's power performance, especially when the engine is idling, low speed, light load and cold engine, the recirculated exhaust gas will obviously affect the engine performance.  Therefore, when the engine is idling, low speed, light load, and cold engine, the ECU controls the exhaust gas to not participate in the recirculation to prevent the engine performance from being affected. When the engine exceeds a certain speed, load and temperature, the ECU controls a small amount of exhaust gas Participate in recirculation, and the amount of exhaust gas participating in recirculation varies according to the engine speed, load, temperature, and exhaust temperature to achieve the lowest NOx in the exhaust.  

 6. Maximum climbing degree (%):  
 Maximum climbing ability when the car is fully loaded.  

 7. Wind resistance coefficient:  
 Air resistance is the largest and most important external force encountered when a car is driving.  Air resistance coefficient, also called wind resistance coefficient, is an important coefficient for calculating the air resistance of automobiles.  It is a mathematical parameter determined through wind tunnel experiments and glide experiments. It can be used to calculate the air resistance of a car while it is driving.  

 Driving method:  

 1. Front-Front Drive (FF):  
 The so-called front-front drive refers to the drive mode of the engine front and front-wheel drive.  This is a form of driving that has really emerged and has been technically perfected since the 1970s, and is currently used by most small and medium-sized cars.  It integrates the transmission and drive axle, and is fixed next to the engine to send power directly to the front wheels to drive the vehicle forward. In the words of the image, it “pulls” the vehicle forward.  
 2. Front and rear drive (FR):  
 The so-called front-rear drive refers to the drive mode of the engine front and rear-wheel drive.  This is a traditional form of driving. The Guangzhou Peugeot, which is familiar to Guangzhou people, is a typical front-wheel drive sedan.  In this type of driving car, the front wheels are responsible for steering tasks, and the rear wheels are responsible for driving.  The power output from the engine is transmitted to the rear drive axle through the clutch, transmission, and drive shaft, and the rear wheels are driven to drive the car forward. In the words of the image, it is “pushing” the vehicle forward.  Front-wheel drive vehicles are prone to oversteer when cornering. 

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