What tests are done on cars before they leave the factory, and do you know about them?
Automotive Seal Inspection EquipmentThe automotive brake test bench has 4 sets of independent drum assemblies, driven by their respective AC motors, which can provide additional torque to accelerate the drum or additional resistance. Testing contents: wheel stalling force, braking force, front and rear axle brake balance coefficient, parking brake, ABS and ESP system performance test, brake pedal test, hand brake force test, and so on.
Driving Performance Test
Automobile chassis dynamometer with 4 sets of independent drum assemblies consisting of two parts: front wheel test and rear wheel test. It can simulate the actual working conditions of automobile operation. Test contents: forward, reverse, acceleration, clutch maneuvering, speedometer inspection, etc.
Emission testing
Vehicle emissions testing is based on the national standard GB18285-2005 "Ignition engine automobile emissions pollutant emission limits and measurement methods (double-idle method and simple working conditions)" and GB3847-2005 "compression-ignition engine and compression-ignition engine automobile emissions smoke emission limits and measurement methods". Test contents: the concentration of exhaust pollutants in idling speed, high idling speed and simple working conditions of vehicles equipped with ignition engines; and the smoke level in the process of acceleration and deceleration of the engine in degrees of freedom of vehicles equipped with compression-ignition engines.
Rain test
Rainfall test bench, simulating strong rainfall environment, testing the sealing performance of automobile front and rear windshields, side windows, doors, luggage compartments and other ministries. The automobile offline rain sealing test equipment is mainly composed of room body, spraying system, blow-drying system and control system.
China Model of Automobile Factory Inspection
Automobile factory inspection of the Chinese model is characterized by: the automobile factory inspection as a national requirement, unlike the general model of the automobile factory inspection as an objective need to ensure the quality of automobile products. Because of this, the automobile factory inspection China mode is in the automobile assembly plant to build a "car safety inspection line";, its inspection content is: emissions, side slip, axle weight, braking, speedometer correction, lighting and so on. Not only is the content of the test less, and the testing accuracy of the equipment is very low, strictly speaking, can not meet the requirements of the automobile factory inspection.
Automobile factory inspection process
Category 1: 4-wheel alignment - lights - sideslip - brakes - drivability - road test - emissions - rain;...
Category 2: 4-wheel alignment - lights - sideslip - brakes - drivability - rain - road test - emissions; and
Combine the braking and driving performance tests in the first or second type of inspection process, and use a comprehensive test bench to complete the corresponding tests.
Automobile factory inspection evaluation method
Automobile factory inspection has two major functions, namely: first, to find problems, solve problems; second, to give an objective evaluation of the quality of automobile products.
Four-wheel alignment test evaluation
In order to factory new car has good maneuvering stability, just will car wheel positioning parameters adjusted to the allowable error range is not enough, need to adjust the positioning parameters to the best matching state. Therefore, the front beam angle of the front wheels of the automobile should be adjusted according to the thrust angle of the rear wheels, and it should be within the specified tolerance range.
Lighting test evaluation
In order to avoid the night meeting when the car lights directly into the eyes of the other driver, so that the other driver can not see the road and cause traffic accidents, automobile headlights are made of anti-glare design. The more scientific detection and evaluation method is: the use of advanced CCD image recognition system headlight detector detects the light and dark cut-off line of the low beam spot, in order to determine the position of the low beam light.
Brake test evaluation
Braking performance is a test item stipulated by automobile regulations, and its test results should meet the requirements of the regulations, which include: the percentage of total braking force and vehicle weight, the percentage of axle braking force and axle load, the ratio of parking braking force and vehicle weight, braking force balance, wheel stalling force and braking coordination time. In addition, but also on the ABS and ESP system effectiveness, regulation rate, response time, dynamic characteristics, maximum static braking force of the braking system, brake pedal force, parking brake maneuvering force and so on to give an evaluation of the evaluation method is mainly with the enterprise related standards for comparison.
Evaluation of automobile driving performance inspection
Evaluation of automobile driving performance for automobile off-line testing, equipment suppliers in accordance with the relevant standards of automobile manufacturers will be evaluated indicators and evaluation methods are fixed to the software of the equipment control system, and its evaluation includes: automobile startup, gear shift, forward, reverse, acceleration, speedometer verification, etc. The driver's operation is completely in accordance with the prompts on the display screen. The driver's operation is carried out in full accordance with the prompts on the display screen, and the running process of the automobile is displayed on the screen in real time by the moving cursor, if the running track of the cursor is within the permissible range governed by the given two curves, the running performance of the automobile is in line with the requirements of the factory.
Road test evaluation
Road test inspection and evaluation to the test driver's subjective evaluation of the main, many automobile companies have begun to explore the development of automobile factory road test inspection equipment. Road test evaluation is very broad, including the automobile assembly components of the operating conditions, whether or not there is a noise, engine operating temperature, oil pressure, generator power generation and charging characteristics, automobile start, acceleration, braking, maneuvering performance, the ability to maintain the car straight line and steering back to the correct characteristics of the suspension cushioning and vibration damping characteristics of the wheels whether the pendulum vibration, and so on.
Evaluation of rain testservant
The evaluation of the rain test is relatively simple, the method is to visually inspect all the parts that have sealing requirements (cockpit, luggage compartment, engine compartment), there shall be no leakage.
Evaluation of emission testing
Emission testing and evaluation is based on the national standards for pollutant emission limitations for automobile emissions, and the emissions of all kinds of harmful gaseous particles are not higher than the nationally specified limitations.