Title: Fluid operated vehicle body level control system

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Claims: What is claimed is:

1. In a fluid operated levelling system of a vehicle body having a source of fluid under pressure connected to a fluid reservoir, the combination comprising:

adjustors operative to raise and lower the vehicle body relative to ground;

levelling valves communicating with the source and the reservoir and being responsive to the tilt of the vehicle body with respect to road surface and operative to communicate the adjustors with the source and the reservoir to move the vehicle body to a level substantially parallel to the road surface;

first electrically controlled normally open valve means connected between the source and inlets of the levelling valves;

second electrically controlled normally open valve means connected between the reservoir and outlets of the levelling valves;

sensing means for sensing the tilt of the vehicle body relative to road surface and generating an electrical tilt representing signal in response to said sensed tilt;

a delay unit connected to the sensing means and including integrating means for integrating said electrical tilt representing signal with respect to time; and

a solenoid control unit connected between the delay unit and the first and second valve means, said solenoid control unit including a level detector responsive to the output of the delay unit and operative to feed said electrical tilt representing signal to the electrically controlled valve means when the integrated level of said electrical tilt representing signal is above a predetermined value for thereby closing said electrically controlled valve means to block fluid communication between the source and the reservoir and the levelling valves.

2. The combination according to claim 1, in which said sensing means is responsive to at least one of the roll and pitch of the vehicle body.

3. The combination according to claim 1, in which said first and second electrically controlled normally open valve means comprise first and second solenoid valves.

4. The combination according to claim 1, in which said sensing means includes a pendulum switch having one contact fixed to the vehicle body and another contact in the form of a pendulum engageable with said one contact when the lack of parallelism between the vehicle body and a horizontal road surface exceeds a predetermined degree.

5. The combination according to claim 1, in which the fluid is in liquid form, and in which the source includes a pump, a pressure control valve and an accumulator.

6. The combination according to claim 3, in which said first and second solenoid valves are integral.
Other info:

Inventors: Hiruma, Mituo (Kodaira, JA)

Application Number: 474066
Filing Date: 1974-05-28
Publication_date: 1976-02-17
Assignee: Nissan Motor Company Limited (Yokohama, JA)
Primary Class(es): 280/6.158 267/64.16, 280/5.503
Other Classes:
US Patent Ref:

3006656	Oct, 1961	Schaub	280/112.
3666286	May, 1972	Engfer	280/124.
3683818	Aug, 1972	Meir	280/112.
3747949	Jul, 1973	Engfer	280/124.
3774714	Nov, 1973	Usui	180/103.
3799570	Mar, 1974	Giordano	280/124.
3840088	Oct, 1974	Marumo	180/103.

Other Refs:
Primary Examiner: Goodman, Philip
Assistant Examiner: Carroll, John A.
Attorney: