Land vehicles – Body elevation or tilt – Static site leveling
Patent
1998-09-30
2000-04-18
Johnson, Brian L.
Land vehicles
Body elevation or tilt
Static site leveling
2807631, 254 45, 254 89R, B60S 900
Patent
active
060505737
ABSTRACT:
An automatic leveling system for a vehicle includes four leveling jacks coupled to a vehicle and extendible into contact with the ground to stabilize the vehicle. A level sensor calculates the location of a plane defined by the chassis of the vehicle, and downloads the information regarding the location of the plane to an onboard computer. The computer calculates the difference between the present location of the chassis plane and a plane which is level. The computer determines which of the leveling jacks need to be extended, and the proportion of extension required by each jack to activate the jacks in unison to level the vehicle. The computer further determines the proportions of flow that are needed to actuate the jacks in unison. To achieve the desired proportional flow, solenoid valves in a manifold coupling the jacks to a source of fluid are operated at varying frequencies. The selected frequencies are determined by the computer and correspond to the percentage of extension required by each of the four jacks to move the chassis plane to a level position.
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Johnson Brian L.
Klebe G B
Kwikee Products Co., Inc.
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