How does auto alternator detect?

When the suspect is suspected of failure, you can initially detect the car, remove the alternator does not disassemble further detection. The tools used to detect can be multimeter, general DC voltmeter, DC ammeter and oscilloscope.

How to detect the alternator without a multimeter in the absence of a car alternator?

Turn the multimeter knob to the DC voltage 30V file, the red pen connected to the motor "armature" then column, black pen then shell, so that the engine running in the speed above, 12V electrical system voltage value should be about 14V, 24V electrical The system voltage standard value should be about 28V. If the measured voltage is the battery voltage, it indicates that the china alternator is not generating power.

Can also use car lights, flashlight homemade small test lights, etc., but also by changing the state of the car to detect.

Start the engine, turn on the headlamps, so that the engine speed from the idle speed gradually increased to medium speed, headlamps brightness increases with the increase in speed, indicating that the china alternator is working properly, otherwise no power generation.

When there is no computer control electronic device, you can use this method to detect. The engine control in the speed above, remove the battery to take the line (usually disconnect the battery on the line control the main switch), if the engine is working properly, indicating that the alternator power generation, otherwise the alternator is faulty.

The flashlight at both ends connected to the wire made of small test lights, connected to the alternator "armature" and between the shell. Use the wires to connect the positive and negative poles of the battery (or the same voltage) to the two magnetic fields of the alternator. The "F1" and "F2" ("AC" ), Let the battery to the china alternator excitation. Quickly turn the engine belt by hand, a small test light that the alternator is working properly, otherwise the alternator does not generate electricity.

There is no tool, then the alternator can not be removed to check, so only in the car inspection. Do not rely on any tools, then the hands can only be used on the car parts, we can use the alternator with a close engine to monitor.

When there is no computer control of electronic devices, you can use this method to detect:

First start the engine, and then open the headlamps, so that the engine speed from the idle speed gradually increased to medium speed, headlamps brightness increases with the increase in speed, indicating that the alternator is working properly, otherwise no power generation. This is a relatively simple method, there is a way, but need to remove the battery cable line, and then see if the engine is working.

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What is the chassis strength?

The stability of the car chassis, refers to a good frame rigid, more adequate suspension support, when you drive these cars, it gives you a strong enough feeling of the chassis. However, this feeling is definitely not hanging hard sticks, if too tough, then it will be bumpy serious (No.: shock is not necessarily good control), the overall lack of rigidity and china air suspension is very hard, there will be a lot of system Of the noise, so that can not be called a solid chassis.

Chassis solidity can be divided into several, one of which is the degree of tranquility. In fact, the chassis noise to the car noise, hanging parts friction sound, after the rugged section of the metal resonance caused by the sound. As for the road noise, it is caused by the friction between the tire and the road, the general car factory will be in the round arch parts for sound treatment, if it is comfort-oriented models, then the noise will do better, in addition, will choose A more quiet tires.

The above mentioned first point - hanging parts and body friction is one of the factors, how to understand this? In fact, encountered in the uneven sections, the china air suspension of the joint bit is to make noise, and the easiest way to deal with is between the two contact points to join the rubber products, it can not only reduce the chassis due to vibration caused by noise, while allowing The whole chassis is more resilient to the pits. However, when a car is up and down to the chassis, when you pass through the uneven sections, you will only feel the china air suspension of the operation, when the pit will not have extra vibration, the chassis will absorb the excess vibration, While there is enough toughness to support, which will make you think there is no feeling of loose chassis.

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Small SUV is not recommended to install side pedals

SUV models are welcomed by most citizens. Many people buy a car, the sales consultant in addition to highlight the highlights of the models, but also recommend some car decoration supplies, side step is one of them. Buy a small SUV, need to install china side step?

For small SUV should not be installed china side step problems, professionals, for the body of the higher SUV models, the installation side step can facilitate passengers on and off, but note that too wide side step, easy to let The passengers tripped over when they got on and off.

Professionals also said that most of the SUV are now using the car chassis design, installation side pedal is more play a decorative role, from the practical point of view, it is recommended not to install.

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How to maintain the hydraulic power steering pump?

In general, in the normal use and maintenance, for the hydraulic china power steering pump, the need to pay attention to the following points:

1. Hydraulic power steering pump in the use of attention to select the correct type of help oil, otherwise it will affect the china power steering pump efficiency and service life.

2. Always check the use of auxiliary oil, the use of auxiliary oil must be kept clean. Regularly replace the booster oil, the owner of the self-refueling oil must be equipped with a filter device.

3. If the car stops for a long time, do not work at full capacity immediately after restarting, at least 10 minutes of no-load operation, until the oil and other oil are in normal working condition.

4. When handling the steering of the car, observe whether the power steering system is operating properly, whether the impact or noise, help the oil circuit with or without leakage phenomenon, in order to detect and troubleshoot.

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Fatigue Performance Analysis of Automobile Engine Crankshaft

Crankshaft is an important part of the car engine, both in the car crankshaft R & D or actual production stage, need to test the fatigue performance of the car crankshaft. In the actual operation of the car engine, the crankshaft to bear the form of the load for the bending and torsional load, so the actual case shows that the main form of failure of the car crankshaft fatigue damage. In addition, if the engine crankshaft output power is large, the greater the torque generated, will produce a certain degree of torsional fatigue damage. Early automotive engine crankshaft used by the material for the 40Cr and 42CrMo and other carbon quenched and tempered steel. However, since the late 1990s, a large number of automotive crankshaft began to widely use non-quenched and tempered steel, especially for heavy-duty engine crankshaft production, the materials used mainly include 48MnV and C38N2, these two materials and medium carbon Compared with the quenched and tempered steel, in the case of ensuring the same strength, a lot of conditioning process is omitted. In recent years, the use of ductile iron production of china crankshaft has better mechanical processing performance and bending fatigue strength, especially in the use of heavy-duty engine to show a good application prospects.

Automotive crankshaft in the design, the choice of raw materials, forging, machining and heat treatment and surface strengthening of all aspects, if any one part of the mistakes will cause the china crankshaft failure. A company combined with the actual bearing production case, introduced and analyzed the car engine crankshaft common failure form and internal reasons.

The factors that affect the fatigue strength of the crankshaft of the vehicle mainly include the stress concentration, the size, the surface condition and the environment medium at the journal. In these factors, stress concentration and size and surface state are most important. The factors that affect the stress distribution of the crankshaft mainly include the design shape of the crankshaft and the basic properties of the material. The bending fatigue strength of the crankshaft can be improved by changing the kind and size of the material, but this will greatly increase the manufacturing cost of the material. In the actual application process, the surface strengthening process is usually used to improve the fatigue strength of china crankshaft. Under the effect of variable load, the maximum stress should appear in a range near the rounded corners of the crankshaft due to the abrupt change in the shape of the crankshaft journal Inside. Research indicates:

(1) Fatigue test of automobile crankshaft The fatigue limit of crank moment is 96.7MPa, the crankshaft stress concentration coefficient is 6.72, and the fatigue test process is in the middle of crankshaft journal. The safety factor at 99% was 1.31.

(2) SEM microstructure analysis of the microstructure and crack fracture of the 40Cr crankshaft journal shows that the microstructure after 40Cr quenching and tempering is tempered sorbite + ferrite + few bainite, conforms to the relevant standard The Fracture analysis shows that the 40Cr crankshaft fracture is a typical dimple and step mixed fracture, and no obvious inclusions.

(3) From the chemical composition and tensile properties of the material and the hardened layer of the journal surface, it can be seen that the reason of the fatigue failure of the crankshaft can exclude the influence of the above factors.

(4) crankshaft drilling hole in the journal internal wall caused by stress concentration, more prone to defects; crankshaft journal under the action of alternating stress is prone to fatigue cracks and expansion, resulting in early fracture of the crankshaft.

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