US 4,391,452 AGranted

Control circuit for vehicle leveling system

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorTaiji Ohmori

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Abstract

A control circuit for a vehicle leveling system which operates to restore the vehicle height to be within a reference vehicle height range. The control circuit comprises a first detecting device which detects the direction of change in the vehicle height, a second detecting device which determines the necessity of levelling operation, a logic circuit which properly controls the leveling operation in response to outputs of the first and second detecting devices, and a holding circuit which increases the duration of an OFF signal so as to render the pneumatic system of the vehicle to be inoperative, for a predetermined length of time. The control circuit effects adjustment in height in response to those changes in vehicle height which inherently require adjustment and avoids any adjustment in response to those changes in vehicle height which naturally occur instantaneously under normal driving conditions.

Claims8

Dependent claims

A control circuit for a vehicle leveling system to restore a vehicle height to be within a reference vehicle height range by operating either a first drive means to raise a vehicle body or a second drive means to lower the vehicle body when said vehicle height is out of said reference vehicle height range, comprising:

a first detecting means for generating a directional signal of vehicle height change in the form of either a HIGH signal or a LOW signal;
a second detecting means for generating a command signal of vehicle height adjustment in the form of either an OFF signal or an ON signal;
main circuit means for selecting for operation either said first drive means to raise said vehicle height or said second drive means to lower said vehicle height in response to said directional signal, and for determining whether or not said drive means is to be actuated;
holding circuit means, connected between said second detecting means and said main circuit means, for increasing the duration of said OFF signal for a predetermined length of time when said OFF signal appears instantaneously, and for transmitting said OFF signal with said duration to said main circuit means;
and
said holding circuit means comprising a monostable multivibrator connected so as to receive said command signal from said second detecting means, and an OR gate connected so as to receive said command signal from said second detecting means and an output from said monostable multivibrator.

3 more elements

Dependencies are inferred from the claim text.