Vehicle suspension is the system of springs and dampers that controls vertical oscillations of the vehicle, determining ride comfort and operating safety. With the technology available today, there are three different functions that can be accomplished with adjustable, electronically controlled suspension. The simplest suspension adjustment is load-leveling used to control ride height for towing and carrying a heavy load in the trunk. Early versions, such as Packard’s in the fifties, utilized torsion bar rear springs. ride height was adjusted by rotating the anchored end of the bar with a starter-type motor, a gearbox and heavy bell crank linkage. Since the weight on the front axle doesn’t change much, the motor solenoid was controlled with a simple mercury switch mounted parallel to the frame rail, acting as the rear height sensor.
Simple load-leveling suspensions today use air-adjustable springs or shock absorbers, an on board air compressor and a real ride height sensor that supplies data to a control unit or an on board computer. The next function of an electronic suspension is semi-active suspension. Semi- active suspension works by changing spring and / or dampening rate. The control unit receives information about vehicle behavior, interprets that information as road surface condition and driver intent, then adjusts dampening to a programmed level of firmness. Dampening adjustment is usually accomplished with a shock absorber that has several different orifice valves to control the flow of oil, with a solenoid or stepper motor used to control valve selection. Finally comes the full-active suspension.
The Term Paper on Automatic Railway Gate Control
Aim of this project is to control the unmanned rail gate automatically using embedded platform. Today often we see news papers very often about the railway accidents happening at un- attended railway gates. Present project is designed to avoid such accidents if implemented in spirit. This project is developed in order to help the INDIAN RAILWAYS in making its present working system a better one, ...
A fully active system can counteract body motions by actually forcing the suspension to extend in response to measured and anticipated vehicle motion. In many ways, active suspension is simpler than other systems because it doesn’t need exotic shock absorbers or air spring technology, just four hydraulic rams and the attendant valves and plumbing. With any adjustable suspension system, the increased range of comfort with control has a price: weight, complexity and cost. That’s why it’s typically used only on larger and more expensive cars.
But computer controlled suspension systems will always have its place in the market, and like those cars, technicians who can fix them will always be a dime-a-dozen.
