The brake ffi shrinkage processing system is filled with a desiccant, the moisture of which is mostly absorbed here, and the mechanical air dryer is as shown. The cleaned and dried compressed air flows to the cleaning tank and then enters the air reservoir through the check valve. When the pressure in the air reservoir reaches the maximum set pressure, the spring-loaded adjustment piston moves to the right. Compressed air flows through the air passage and acts on the upper portion of the recoil piston. The recoil piston is pushed down by the compressed air and the seat A is opened. The compressed air is vented to the atmosphere, and there is a huge pressure difference between the cleaning tank and the recoil piston. The air filled in the cleaning tank is turned in the direction of the air and is placed in the atmosphere through the filter. Foreign matter and moisture are placed in the atmosphere. When the air pressure in the air reservoir is reduced to the lowest set pressure, the spring-supported adjustment piston is shifted to the left and cut to the air passage of the recoil piston. The recoil piston is pushed up by the spring force and the seat A is closed. At this point, the compressed air from the air compressor flows to the filter and re-enters the reservoir.
The cut-in and cut-out pressures are determined by a regulator integrated with the air dryer. These pressures can be controlled by changing the settings of the regulator. The heater is sealed by the electric control unit Genshijiazhuang Alsa Automobile Passenger Transport Co., Ltd. (050021). Modern vehicles, especially commercial vehicles, are increasingly popular for compressed air. Brakes, shifting mechanism boosters, clutch boosters, air Compressed air is used in suspensions, seat adjustments, door controls, and even air-conditioning mechanisms for air conditioning. Due to the large number of chassis control systems for compressed air applications, the quality and storage requirements of compressed air are higher. Separating, drying and filtering impurities, oil and water in compressed air are avoided to avoid the various pneumatic valve components and piping. Corrosion and damage, and maintaining the air pressure in the brake circuit within the specified range, it is important to protect the compressed air system safely. Filtering the water, oil and impurities from the compressed air of the air compressor through the air dryer can ensure that the air entering the air reservoir is dry and clean, effectively preventing the brake system from being damaged due to rust or freezing in the brake system. Improve vehicle safety and reliability. At the same time, the air dryer must have a regenerative gas path to ensure its performance. Existing dryers have two types of regeneration gas paths: a regeneration gas bottle; and an automatic regeneration device.
The air dryer is designed to perform this function. The compressed air from the air compressor contains moisture, which can rust and cause the lubricating film to fail. At lower temperatures, the pipe may be frozen. The air dryer uses molecular sieves to remove moisture from the compressed air, ensuring that the pipes are not frozen, prolonging the service life of the brake system, reducing maintenance and improving reliability.
Early vehicles, such as the liberation CA1091, were equipped with air compressors with unloading devices (controlled by a gas pressure regulator). The unloading device does not work when inflated. Once the air pressure reaches the set value, the unloading device works and the air compressor unloads and idling.
At present, vehicles are generally equipped with a dryer with heating function and a recoil cleaning tank (regeneration cylinder). They generally consist of a filter and a valve body. The filter includes a filter element, an annular filter device, and a desiccant, and the valve body includes an air conditioner, a heater, and an exhaust port. The compressed air generated by the air compressor is sent to the air inlet to enter the filter and the annular filter unit where larger particles and oil are filtered out. The compressed air is cleaned according to the ambient temperature for heating time control. The heater automatic opening temperature is 7 ft ± 6 heater automatic disconnection temperature 29.5 弋 ± 3 heater power With the increase of vehicle auxiliary functions and equipment and the increase of pipelines, it is objectively necessary to reduce the installation size of air handling equipment, The demands of energy and environmental protection in today's society are also constantly increasing. Therefore, on this basis, an electronically controlled compressed air treatment system has been developed, which is packaged on passenger cars and heavy goods vehicles.
The ECAD system ECAD (Electronic Control Air Dryer) consists of two solenoid valves, as shown in the ECAD circuit diagram. The unloading solenoid valve performs a pressure control function, and the regenerative solenoid valve performs an air regeneration function. The above two controls are different from the traditional mechanical control method, which collects signals such as line pressure, engine speed, engine running time, vehicle speed and ambient temperature through the vehicle electronic control system, which are separately controlled by the vehicle electronic control system. The line pressure can be adjusted between 0.85 MPa and 1.25 MPa. This system does not set a regenerative gas cylinder, and the regeneration process not only occurs during the exhaust process, but also self-identification during the entire operation of the dryer for timely and multiple regeneration control operations to achieve optimal air regeneration control. . Even after the engine is stopped, the freezing of the exhaust port can be avoided by independent air regeneration. Thanks to the intelligent control, the operating time and state of the air compressor can be monitored through dedicated monitoring equipment, and the closed-loop control of the pressure can effectively improve the efficiency of the air compressor.
In order to effectively avoid the freezing of the exhaust valve, the ECAD air dryer is also equipped with a 150W heater.
The E-APU is a compressed air treatment unit that combines air drying, air pressure regulation, and four-circuit protection valves. It is highly integrated and intelligent. The E-APU system consists of three main components, the circuit diagram of which is shown.
Dryer with safety valve and desiccant.
Multi-way protection valve, including air compressor control solenoid valve and regenerative control solenoid valve, and 4 protectors for compression of 2 brakes, trailers and parking brakes, auxiliary devices, air suspension, etc. air.
48 Automobile Maintenance and Repair 2007 (3) Electronic control unit, the electronic control unit communicates with the vehicle's CANBUS to receive information such as vehicle travel speed, vehicle braking condition, engine working condition, etc. from the vehicle LAN bus. Then, according to the specific vehicle use demand condition, the control of the two solenoid valves is realized through an internal preset internal program, and the compressed air is supplied and regenerated as needed.
The use of the automotive lamp system in the Wu District (1) due to the integrated design of the components, the assembly cost and time of the components is greatly reduced. The structure assembled more than a single component is less expensive.
The consumption can be reduced by 0.35L. (3) For the different use needs of trucks and buses, the parameters of the ECU can be preset in the production line or workshop, and the pressure value can be adjusted within the range of 0.9MPa-1.25MPa. The E-APU system can obtain information such as vehicle speed, engine and braking conditions via the bus, and can self-regulate according to different vehicle operating conditions.
(4) The information of the ECU can be used for the diagnosis and repair of the fault, so that the inspection of the system has rules to follow.
èšŒåŸ Automobile Management College Automobile Training Brigade (233011) Li Jinxue car lighting as a special language for cars directly reflects the direction of the car, the driver's motivation and intention. In order to ensure the safety of driving, it is necessary to ensure the complete and effective use of the lights, however, there are many misunderstandings in the use of the lamp system.
1 肆 开 远 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多 许多In fact, there are certain drawbacks to this. The high beam is too glaring. The long time will cause the driver's visual "blind zone", which is very easy to cause traffic accidents. Most of the vehicles that like to drive high beams are large trucks, minibuses, taxis, and drivers of some cars.
2 Using fake lights, some drivers are tempted to buy fake lights when they change lights, which poses hidden dangers for safe driving. A qualified luminaire must pass 14 test standards such as light distribution, moisture proof, shockproof, durable, and sealed, and counterfeit and shoddy products often cannot withstand any of them. For example, fog lights are not eye-catching, headlights are dazzling, and small lights are easily damaged. These inferior lamps will seriously threaten driving safety.
3 use "stick will be bright"
Some drivers use a so-called "bright" light to smash the line, hoping to improve the lighting effect. It generally consists of 13 blue self-adhesive plastic stripes with different widths. The width of the stripes is between 1.50 mm and 12 mm. The stripes are narrowed from top to bottom, and the stripes and stripes are 8 mm apart. The area is 400 rmnxl80 mm. The test proved that "sticker must be bright" not only can not make the lights brighter, but will help.
4 night driving will not light a lot of drivers when driving at night, the car will not light (do not turn off the high beam) is likely to cause an accident. If one party takes the initiative to light and the other does not, it will often irritate the active side. Even the two formed a strong speculative light, resulting in unclear sight and unclear judgment. Especially in complex road sections such as narrow roads, narrow bridges and Lushan dangerous roads, the consequences are even more unimaginable.
5 When driving at night, it is safer to turn on the fog lights before and after. Many drivers will turn on the fog lights before and after driving at night, which is considered safer. In fact, this will be even more dangerous. In particular, the white light beam of the front fog lamp is very strong, which will affect the vehicle traveling on the opposite side, and it will also affect your own safety. You can only use the xenon lamp during the day or night if you are experiencing bad weather.
6 The higher the power of the bulb, the better. Some drivers use a vacuum lamp with a higher power in order to increase the brightness of the headlights. As a result, when driving at night, the brightness is not enhanced, but decreases, and the battery discharge is severe after the headlight is turned on. This is because the power of the replaced headlamp is too large, causing the generator to be overloaded.
Car maintenance and repair 2007.2 49
Hydraulic Control Valve,Hydraulic System Flow Control Valve,Flow Control Valve Device,Automatic Hydraulic Control Valve
Shuyang County Huji town Desheng hydraulic machinery factory , https://www.dshydraulic.com