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Tiffany Yuan

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About Tiffany Yuan

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  1. Deformation failure mechanism of automobile parts 1) Definition: Deformation is defined as the change of the size and shape of a part due to the action of load or internal stress during its use. Deformation is an important cause of parts failure, such as crankshaft, clutch friction disc, transmission shaft and spindle. 2) classification of deformation failure: elastic deformation failure, plastic deformation failure and creep failure. 3) factors affecting the deformation of automotive parts Deformation failure of parts except metal materials, design stiffness and manufacturing process related to the installation of improper fastening or work has obvious overload phenomenon humidity: with the increase of working temperature, the strength of materials will also decline, so at higher temperatures working parts are prone to deformation of the deformation clutch piece warping deformation brake drum, exhaust manifold changes For foundations, there is internal stress due to imperfect ageing treatment during casting, which causes deformation due to stress redistribution in application, and incorrect repair techniques or methods, such as welding thermal stress. Feilong jiangli will update analysis of more auto parts failure models.
  2. Failure concept The failure of automobile parts to lose the functions specified in the original design is called failure. Failure refers not only to the complete loss of original functions, but also to functional degradation and serious damage or hidden dangers, continued use will lose reliability and safety components. Basic form of failure Classification of failure according to failure mode and failure mechanism is an important part of failure study. Automobile parts can be classified into five types according to their failure modes, i.e. wear, fatigue fracture deformation, decay and aging. Several failure modes or failure mechanisms may exist simultaneously for each part. Feilong jiangli try his best to take all the conditions into consideration to develop the best water pumps and other parts for the customers.
  3. Common failures of electronic-controlled engines are as follows: difficult starting; unstable idle speed; unstable idle speed of hot vehicles; engine tempering; engine running weakness; engine intermittent failure; cylinder starvation; excessive fuel consumption; poor acceleration and other symptoms. There are various reasons for every failure. 1.4Reasons for intermittent engine faults (1) Loose wiring connectors, tighten each item firmly; 2) Inspect the ignition system and the cylinder high-voltage spark (3) Check the status of distributors (4) Check whether the vacuum tube has air leakage (5) artificial vibration, observe whether the fault phenomenon changes. Feilong Jiangli will share other faults analysis of electronically controlled engine.
  4. Analysis of common faults of electronically controlled engines Common failures of electronic-controlled engines are as follows: difficult starting; unstable idle speed; unstable idle speed of hot vehicles; engine tempering; engine running weakness; engine intermittent failure; cylinder starvation; excessive fuel consumption; poor acceleration and other symptoms. There are various reasons for every failure. 1.1 Idle speed instability (1) Inlet system problems, make the mixture too thin (2) auxiliary air valve operation is not normal (3) injector injection time is not correct (4) ignition system is not correct (5) valve clearance is not correct (6) cold start injector leakage and other 1.3 engine operation of the main reasons for powerlessness (1) low fuel pressure, Poor fuel supply (2) poor ignition system or ignition timing (3) poor engine compression system (4) insufficient air flow meter or intake pressure sensor (5) engine wear seriously, insufficient cylinder compression Feilong Jiangli will share other faults analysis of electronically controlled engine.
  5. Other Engine failures 1) water tank rust and scaling. Rust and scaling are the most common problems in engine water tanks. Rust and scale will restrict the flow of coolant in the cooling system, reduce heat dissipation caused by engine overheating, and even cause engine damage to form acid, corrosion of metal parts in the tank, resulting in tank damage, leakage. Regular use of tank tension efficient cleaning agent to clean the water tank, remove rust and dirt which ensure the normal operation of the engine, and can extend the overall life of the water tank and engine. 2)the cooling system is in bad condition. The lubrication system is especially important for automobile engine maintenance, and little attention is paid to the cooling system. It is unknown that the most common troubles of automotive engines, such as piston cylinder pulling, knock cylinder punch internal leakage of serious noise, acceleration power drop is due to the abnormal temperature of the automotive engine, excessive pressure caused by poor condition. The bad condition of the cooling system will directly lead to the engine can not work at normal temperature, which will lead to the above serious failure phenomenon. Feilong Jiangli will share other kind of failure.
  6. Engine failure classifications First, failure of cylinder and tile burning. When there is too much carbon between the piston and the cylinder, or insufficient oil, and too much dirt in the configuration system, the piston will be damaged when heated and expanded. And burning tile is generally in the system when problems, such as insufficient oil, configuration clearance is too small, oil plug is not impassable and so on, resulting in difficult start-up startup, flameout or smoke phenomenon. Maintenance measures for such troubles are to replace the appropriate piston according to different vehicle types and the corresponding engine-like cylinder to alleviate the damage of the cylinder. When the Bush is burnt, it needs to be scraped to adjust the degree of shaft and Bush configuration, and then, bearing dressing can be solved. Feilong Jiangli will share other kind of failure. Second, fuel injection pump problem. If the injection advance angle praseodymium error. If the valve is not sealed or the parts are damaged, the fuel injection pump will be replaced, or if the fuel supply advance device is damaged, the spring may be broken, the spring supporting plate may be worn out, the counterweight block will be stuck and replaced.
  7. Engine failures can be roughly divided into the following: 1. The main reason of engine starting lag is the lack of battery energy. The engine speed is inversely proportional to the starter power. The higher the engine speed, the less starter power. In the case of starter power shortage, the engine starting will be very difficult. Of course, when the engine joint is loose, the tubing is broken and the base cushion is not strict, the piston is damaged, air and oil seepage, or oil seepage, pipeline blockage, sealing is not good, cylinder pressure is too low and so on, will also affect the normal operation of the starter to solve the maintenance measures is to replace the battery first. If the problem still exists, it is necessary to replace the oil pipes, connectors and liners of the engine as soon as possible, and then discharge the filters and sewage from the pipes to keep them open or replace the piston rings with better wear resistance to make the cylinder pressure normal. Feilong Jiangli will share other kind of failure. 2. Premature or late fuel injection causes abnormal oil. People who drive cars often have this experience, such as the cylinder when the fuel supply "when" sound or dull "ringing" sound, which is really premature fuel injection and the performance of the spring, in this case the fuel supply is either too large or insufficient, resulting in engine speed and dynamic abnormality. The maintenance strategy is to loosen the two screws of the fuel injection pump coupling after the car starts, so that the flywheel pair on the fuel meter is on the corresponding degree line on the rotating disc of the fuel injection pump, and at the same time, to align the rear knuckle up by the timing so-called calibration line, which corresponds to the strength of the full pedal on the throttle, so that the fuel supply is stable until the normal power.
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