摘要:
In a closed level control system for vehicles, a vehicle body is suspended relative to at least one vehicle axle. The level control system includes pressurized medium chambers, a compressor, an air dryer and a pressurized medium supply vessel which is partitioned into first and second pressurized medium spaces. The two pressurized medium spaces have no direct connection. Either the first pressurized medium space or the second pressurized medium space can be connected to the compressor input or the compressor output via at least one common controllable directional valve so that the pressurized medium from the pressurized medium chambers can be transferred into the first or into the second pressurized medium space or pressurized medium can be transferred from the first or the second pressurized medium space into the pressurized medium chambers.
摘要:
A pneumatic suspension system for a vehicle includes pneumatic bellows connectable by means of a valve arrangement to at least one other component of the pneumatic suspension system in order to selectively increase or decrease the amount of compressed air therein. The other component contains at least one volume. Undesirable changes in the amount of compressed air inside the pneumatic bellows arising as a result of pressure compensation are avoided or reduced to a non-disruptive level a return valve between the valve arrangement and the volume which prevents compressed air from flowing between the pneumatic bellows and the volume in one direction of flow.
摘要:
In a process for controlling the quantity of air in a closed, chargeable and estimable pneumatic level control system of a vehicle, which level control system comprises at least one pressure sensor, one pump, an actuator, a storage reservoir and pressure lines interconnecting these components, at least one vehicle body level sensor, and a temperature sensor, which measures the ambient temperature, from the values measured an air mass of the level control system is calculated on the basis of the air pressures in the components, the level of the vehicle and the ambient temperature. Furthermore, the level of the vehicle, the ambient temperature and a maximum possible change in level from a particular vehicle level are used to calculate a vehicle-specific desired air mass and a desired air pressure in the system. The air mass is increased if the actual air pressure drops below the desired air pressure, and the air mass is reduced if the actual air pressure exceeds the desired air pressure.
摘要:
A vehicle air-suspension system, especially an air-suspension system designed as a partly closed system, and a method for operating the system are provided. The air-suspension system includes at least one compressed-air delivery device, a plurality of air-suspension bellows and valves constructed and arranged for control of the filling of one, several or all air-suspension bellows with compressed air discharged by the compressed-air delivery device. The method avoids an undesirably large pressure rise on the pressure-outlet side of the compressed-air delivery device as the effective delivery capacity of the compressed-air delivery device is automatically controlled as a function of the state defined by the arrangement of the valves.
摘要:
An air suspension for a vehicle includes at least one air spring per wheel at at least one vehicle axle, one pump, at least one accumulator, and one circuit arrangement for connecting these units, the pressure side of the pump being connected to the accumulator or the air springs. To form a closed compressed-air system, the intake side of the pump is connected via at least one valve to the accumulator or the air springs, and at least the air-guiding interior pump chambers between the intake side and the pressure side of the pump have a pressure-tight design. The air suspension system requires comparably low energy consumption and small unit volume at a high level of efficiency.
摘要:
An electronic fluid suspension system having longitudinal acceleration sensor, acceleration difference calculation means and vehicle attitude control means in addition to other fluid flow control components known in the conventional suspension system. In this system, the vehicle attitude is controlled responsive to the difference between a maximum acceleration and a minimum acceleration detected within a predetermined time interval. When dive or squat of the vehicle body is anticipated by the difference, vehicle attitude control is performed, without inappropriately responding to a momentary change in the acceleration. After the vehicle attitude control, a return control is performed to restore the original attitude and, further, a vehicle attitude correction control is performed responsive to a difference in actual front/rear heights and corresponding original heights.
摘要:
An active suspension of a motor vehicle is controlled by a system and a method which comprise combining a controller and an actual flow quantity estimation circuit for estimating by logic operation the flow quantity of the fluid actually flowing through each control valve of the suspension with respect to a total desired flow quantity, and calculating the difference between the actual flow quantity value thus estimated and the desired flow quantity, thereby correcting the desired flow quantity. A command signals is generated and transmitted in accordance with the desired flow quantity thus corrected for operating the control valve to undergo opening/closing operation.
摘要:
An electronically controlled fluid suspension system for adjusting a vehicle's attitude rapidly controls the vehicle height: by providing and blocking the fluid communication between fluid springs and reserve tanks; and by shifting the damping force of shock absorbers to a higher degree in response to the change of the vehicle height. As a result, it can avoid the late control of the vehicle height and prevent the vibration of the vehicle body due to the vehicle height's adjustment, thereby enhancing riding comfort.
摘要:
An electronic controlled gas suspension system for realizing rapid control of the vehicle attitude and uniform actions of air springs. In this suspension system, gas states in plural reserve tanks are detected by gas state detection means to energize/deenergize communication means for communicating/discommunicating the reserve tanks one another when a pressure difference among the reserve tanks is determined to attain a predetermined value, so that the air states in the plural pressure tanks can be controlled to be equal.
摘要:
Provided is an electronic controlled air suspension system consuming less energy in preparing air in the high pressure reserve tank and low pressure reserve tank. Until the total sum of pressures of high pressure reserve tank and low pressure reserve tank reaches a predetermined first value, the pressure in the low pressure reserve tank is preferably controlled. After that, air in the low pressure reserve tank is supplied to the high pressure reserve tank until the pressure in the high pressure reserve tank reaches a desired value. In another feature of the invention, air is rapidly charged to the high pressure reserve tank regardless of the above procedure when a rapid charging to the reserve tanks are needed. This ensures continuous operations of rapid vehicle attitude control.