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Mean pressure estimation for compressible fluid strut

a technology of compressible fluid and mean pressure, which is applied in the direction of shock absorbers, instruments, cycle equipment, etc., can solve the problems of delay in the updating step, and achieve the effect of eliminating cost-effective pressure sensors

Inactive Publication Date: 2005-08-18
FLUID RIDE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] One embodiment of the method includes the steps of providing a database of values for mean pressure variation corresponding to a specific combination of motor speed and flow demand. The flow demand and the speed of the motor are determined, and the mean variation corresponding to the determined combination of motor speed and flow demand is selected. The estimation of strut mean pressure is updated with the selected mean pressure variation. In this way, costly pressure sensors are eliminated as well as the complicated control algorithms which are used therewith.

Problems solved by technology

Further, the updating step may be delayed by a period of time corresponding to the travel time of fluid flow from the cylinder to the strut.

Method used

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  • Mean pressure estimation for compressible fluid strut
  • Mean pressure estimation for compressible fluid strut
  • Mean pressure estimation for compressible fluid strut

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Embodiment Construction

[0018] Turning now to the figures, FIG. 1 depicts a schematic illustration of an active suspension system 20 constructed in accordance with the teachings of the present invention. The active suspension system 20 includes, among other components not listed or shown here, a motor 22 driving a cylinder 28, which in turn supplies and returns pressurized fluid to a compressible fluid strut 40. The motor 22 is preferably a digital displacement pump motor which allows execution of discrete flow demands. The motor 22 includes a shaft 24 which in turn drives a crankshaft that 26 translates the rotational motion of the motor 22 and shaft 24 into an axial motion for driving the cylinder 28.

[0019] The cylinder 28 generally includes a piston rod 30 connected to a piston 32. The piston rod 30 is driven by the crankshaft 26, and the piston 32 reciprocates within the cylinder 28 to pressurize fluid contained therein. The cylinder 28 includes a high pressure valve 34 and a low pressure valve 36. Th...

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Abstract

A method and apparatus is provided for estimating the mean pressure in a compressible fluid strut. A database is employed containing values for mean pressure variation corresponding to a specific combination of motor speed and flow demand, and may also account for strut temperature. The flow demand and the speed of the motor are determined, and the mean variation corresponding to the determined combination of motor speed and flow demand is selected. The estimation of strut mean pressure is updated with the selected mean pressure variation. In this way, costly pressure sensors are eliminated as well as the complicated control algorithms which are used therewith.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method and apparatus for estimating the mean pressure in a compressible fluid strut, forming a portion of an active suspension system in a motor vehicle. BACKGROUND OF THE INVENTION [0002] An active suspension system for a motor vehicle utilizes actuable struts at each wheel of the vehicle whereby the pressure within the struts may be controlled to actively regulate the damping and spring effect of the suspension system. One key component of such an active suspension system is a pressure detector or sensor that provides a reading of the strut mean pressure for each strut. As used herein, the strut mean pressure is the static pressure variation a strut can have after executing flow demands. [0003] Typically, a high level vehicle dynamics controller creates a desired pressure for a particular strut, and based on a comparison between the detected strut mean pressure and the desired pressure, an actuator increases or decre...

Claims

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Application Information

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IPC IPC(8): B60G17/015B60G17/052B60G23/00F16F9/14F16F9/43
CPCB60G17/0155B60G2500/205B60G17/0528
Inventor SONG, XUBINOSORIO, CARLOS FERNANDOEDMONDSON, JEREMY RICHARD
Owner FLUID RIDE
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