variable suspension means may automatically change the level of the suspension or manually or hardness to suit different vehicle travel road needs. The issue of suspension is a factor that consumers are more concerned about, because it directly affects the vehicle’s comfort and handling. However, with today’s technological level, the normal spring shock absorbers hard to do best of both worlds. In the process of constant pursuit of perfection in the automotive field, variable suspension system was born. Variable suspension effect by manually or automatically changing vehicle suspension height / soft and hard road travel to accommodate different needs.
1 variable suspension noun
The variable suspension means may automatically change the level of the suspension or manually or hardness to suit different vehicle travel road needs.
2. The air suspension work
Generally speaking, adjustable air suspension equipped vehicle front and rear wheels are provided near the ground distance sensor, the distance sensor according to the output signal from the ground , traffic computer determines the change in height of the vehicle body, and then controls the air compressor and the exhaust valve, the spring automatically compressed or elongated, thereby lowering or raising ground clearance, of a high speed by increasing vehicle stability or complex road .
3. The air suspension composition
In fact, mentioned active suspension system, we first thought, and is the most widely used natural air suspension, and in the system components, which is mainly composed of computer control, the air pump, pressure reservoir, the front and rear shock absorbers and the pneumatic air distributor and other components. The main purpose is to control the horizontal movement of the vehicle body to adjust the level of the vehicle body and adjusting the hardness of the shock absorber.
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4 air suspension free
● electromagnetic adjustable suspension
Technical features: advanced technology, fast response systems.
technical deficiencies: high cost, more used on luxury cars, the stability to be tested.
Application of models: Audi TT, Cadillac the SLS, Cadillac the CTS
The so-called electromagnetic adjustable suspension uses electromagnetic reactor to achieve car chassis height level change a hanging manner, it can be very respond within a short period of time. To suppress the vibration, maintaining vehicle stability. Especially in some relatively extreme environments such as high-speed driving in suddenly encountered turbulence, electromagnetic suspension will be very obvious advantages, its speed of response may be suspended five times faster than conventional.
● electromagnetic suspension
In the system composition of the electromagnetic suspension system is a trip computer, wheel displacement sensors, electromagnetic hydraulic rod and straight shock absorber components. Wheel has a displacement sensor which is connected to the trip computer of the vehicle body and each wheel is connected, the PC and connected to the driving rod and straight electromagnetic hydraulic damper. Mystery electromagnetic absorber is to function as an electromagnetic wherein fluid damping medium, such electromagnetic fluid is a synthetic hydrocarbon compound and fine particles composed of iron. These metal particles are in the normal state, will be chaotic distribution in the liquid, and with changes in the magnetic flux and generating the electromagnetic field, they will be arranged in a certain structure, the coefficient of viscosity also changes, thereby changing damping. And the electric field strength can be controlled only by changing the current. That control of the system only needs to be able to achieve the purpose of changing the current control damping coefficient.
Cadillac the MRC electromagnetic suspension
In fact, this damping process, mainly in the vehicle is traveling over bumps, causing runout of the wheel when the sensor signal to the rapidlyControl system, the control system sends a corresponding instruction, sending electrical signals to the electric coils of the respective shock absorbers, so that movement of the current generates a magnetic field in the magnetic field, the viscosity of the magnetic fluid to be changed to achieve control of the vehicle body, damped purpose. And such a complex process is really just a snap. For example, said that when you read more than a few lines of text, a process that may already have been done 3000 times. (Up to 1000 times per second)
5. The air suspension technical characteristics
liftable chassis widely used models
● Technology deficiency: as reliable as the coil spring
● application models: Benz S350, Audi A8L, Cayenne Porsche
Of course, compared to the conventional suspension, because the air is more complex adjustable suspension structure, which and the probability of failure will be higher than the frequency of a coil spring suspension system, the air is used as the power source to adjust the ride height, the sealing member is a related problem, and, if the chassis height adjustment frequently, and may cause pump system local overheating will shorten the life of the pump. Of course, with the increasing level of technology, many problems have been well resolved, at the same time, the application of models has become increasingly widespread.
6. The air suspension operating state
In daily adjustment, several states have air suspension.
1, the holding state. When the vehicle is lifted lifts off the ground, the air suspension system will shut down the associated solenoid valve, while the height of the vehicle body computer memory, to keep the vehicle original height after landing.
2, the normal state, i.e., the engine operating state. Driving the process, if the body height variation exceeds a certain range, the air suspension system adjust the ride height at regular intervals.
3, awake state. When the air suspension system is fob, door or trunk lid switch wake up, the system checks the sensor body height by the body level. If the ride height is lower than the normal height to a certain extent, the gas tank to provide pressure to the body rose to normal height. Meanwhile, the shock absorber can be adjusted air suspension firmness, including soft state and hard state and normal state 3 (also denoted as comfort, normal, three motion mode, etc.), the driver can be controlled by vehicle control knob .
7. The hydraulic adjustable suspension
adjustable hydraulic suspension. As the name suggests, is the use of hydraulic pressure changeAdjusting the suspension system of the vehicle body. It is the core component of a built-in electronic module integrated hydraulic, can be adjusted and the degree of stretching frequency of the shock absorber according to the vehicle speed. Further, since the weight distribution with somewhat different models, thus generally longitudinal to install the lateral acceleration yaw gyro sensor used to collect body movements, wheel runout and the inclination status signal in the vicinity of the center of gravity of the car, through the trip computer operation signals, and transmitting the signal to the appropriate actuator performs four cylinders, so as to increase or decrease the hydraulic oil and the like to vary ground clearance.
● Technical features: chassis can lift, hydraulic oil better durability
● technical deficiencies: relatively old technology level, reaction rate Pianman
● application models : Citroen C5 (O) C6 Citroen
works
Similarly to the air suspension system is adjustable, hydraulically adjustable suspension of the chassis can also be automatically increased or regulation. For example, we Citroen to older hydraulic adjustable Entitled suspension on the C5 model to be example. It is in the parking, its ride height is automatically reduced to a minimum, after cranking restore body height. When the vehicle running state, city road and the vehicle speed is less than 110 km / h, it will be the standard height; when the vehicle speed exceeds 110 km / h, the electronic control hydraulic block body head portion by 15 mm, the tail of the car by 11 mm. The center of gravity of the vehicle can be reduced to improve the running stability, decrease the maximum sensitivity of the upwind section and a reduction of side winds, while reducing fuel consumption; when the vehicle speed is less than recovery 90 km / h to the standard height; a bad road, the integrated electro-hydraulic control block body increases, in order to ensure maximum comfort and cushioning stroke length.
8. Electronic adjustable hydraulic suspension
Electronic adjustable hydraulic suspension system, also known as continuous damping control (CDC), which is also an active suspension. The system can be controlled independently of each wheel suspension damper. Electronic sensors which can, make timely adjustments to the damper according to the read road information, so that frequent switching between hard and soft. To more quickly and accurately control the body roll, pitch and yaw jitter. Improve high-speed driving and cornering stability.
Technical features: control precision, fast response
inadequate technology: stability to be tested
Application models: Buick LaCrosse, Opel Astra (overseas)
with the more traditional hydraulic different adjustable suspension, electronic hydraulic suspension dependence of the electronic device to be stronger. The core member by the central control unit, CDC shock absorbers, vehicle body acceleration sensor, an acceleration sensor and a wheel CDC control valves, wherein the damper is configured based on the conventional hydraulic damper, the damper has a fluid injection, internal and external two chambers, the oil can flow through the pores of the link between the two chambers, when the wheel bumps, the shock absorber piston will move up and down within the sleeve, it will reciprocate in the oil chamber of the piston reciprocating motion under the action of the flow between the two chambers. Fluid friction between the hole wall and the friction between the oil molecules resistance to movement of the piston, the vibration kinetic energy into heat, which is released into the air through the damper housing, thus achieving the damper the “shock” process.
Then again, CDC is not very advanced suspension technology, the application can only say that in the medium-sized car joint venture brands are rare. In fact, in 2004, the system has been equipped to the Opel Astra model. In other words, CDC least five years before it applied to the production models. By 2008, on a common brand-new midsize platform –Epsilon II platform, the Opel Insignia (new Regal prototype) was born, it applies Flex Ride adaptive chassis systems, is based on CDC system comes .