variable suspension means may be altered automatically, or the level of hardness of the suspension or manually to accommodate 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 role is to automatically change the suspension height / soft and hard to adapt to different road driving demand manually or vehicles.
The air suspension
Features: liftable chassis widely used models
Technical lack of: as reliable as the coil spring
application of models: Benz S350, Audi A8L, Cayenne Porsche
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in fact, he mentioned active suspension system, we first thought, and most widely used natural air suspension, and in the system components, which is mainly controlled by the computer, air pump, pressure reservoir, pneumatic front and rear shock absorbers and the like air distributor member. 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.
Generally speaking, adjustable air suspension equipped vehicle front and rear wheels are provided near the ground distance sensor, by the output signal from the distance sensor, the 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, a high speed to increase the vehicle stability or through sexual complex road.
In daily adjustment, several states have air suspension. 1, on hold. 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. DriveProcess, 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.), may be performed by the driver of the vehicle control knob control.
Of course, compared to the conventional suspension, the air adjustable suspension structure is complicated, and its failure probability will be higher than the frequency of the coil spring suspension system, with air as the power source to adjust the height of the chassis, the sealing member is a related problem, and, if the chassis height adjustment frequently, and may cause local overheating pump system, it will greatly 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.
Electromagnetic adjustable suspension
Features: advanced technology, fast response systems.
technical deficiencies: higher costs, more used on luxury cars, the stability to be tested.
Application of models: Audi TT, Cadillac SLS, Cadillac the CTS
The so-called electromagnetic adjustable suspension frame is the use of electromagnetic reaction way to achieve a suspension lift car chassis height changes, it can react in a very 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, the advantages of the electromagnetic suspension will be very obvious, it can be five times faster response rate than conventional suspension.
In the composition of the system, the electromagnetic suspension system by the traffic computer, wheel displacement sensors, electromagnetic hydraulicAnd a shock absorber rod straight. 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.
In fact, this damping process, mainly in the bumpy road the vehicle is traveling, the wheel caused when the beating, the sensor signal to the control system quickly, the control system sends a corresponding instruction to transmit electrical signals to the respective Save electronic shock absorber coil, 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, the damping purposes. 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)
hydraulically adjustable suspension
Features: can lift chassis, a hydraulic oil is more durable good
is less technology: relatively old technology level, reaction rate Pianman
application of models: Citroen C5 (O) C6 Citroen [123 ]
adjustable hydraulic suspension. As the name suggests, it is the use of hydraulic pressure to regulate the change of the vehicle body suspension systems. 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 performing the corresponding letterPass execution number to four cylinders, and the hydraulic oil in a manner to increase or decrease the clearance change and the like.
adjustable air suspension system is similar, the hydraulic suspension can be adjustable or automatically raised chassis. For example, we set the old Citroen hydraulic adjustable suspension on the C5 model called to be a 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.
Electronic adjustable hydraulic suspension
Technical features
: control precision, fast response
is less Technology:
stability to be tested
application models:
new Buick LaCrosse, Opel Astra (overseas) electronic adjustable hydraulic suspension, also known as continuous damping control system (CDC), it is also an active suspension. The system can be controlled independently of each wheel suspension damping. 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.
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, two fluid chambers by UnicomFlows between apertures, when the wheel bumps, the shock absorber piston will move up and down within the sleeve, its cavity under the action of the oil will reciprocate piston reciprocating 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 ldquo; damping rdquo; process.
Then again, CDC is not very advanced suspension technology, the application can only say in a joint venture brands are not many mid-sized car see. 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 .