US 3,941,035 A · Control unit and method

Abstract

A control unit which is particularly useful in controlling the output pressure of a turbocharger in response to the manifold pressure with compensation for pressure drop at the throttle characterized by a reference unit disposed in the housing for the manifold pressure to act on and at least one diaphragm extending across said housing to apply the pressure differential between the manifold pressure and the output pressure of the turbocharger. In one embodiment, the reference unit includes a bellows of a predetermined volume of gas which schedules the displacement of the reference unit in response to the temperatures of the gases of the manifold. Another embodiment includes an additional diaphragm and valve means for applying additional pressures to the reference means to compensate for the altitude for the system to prevent overspeeding of the turbocharger.

Claims6

Dependent claims

A device for generating a signal in response to a pressure of a fluid taken from at least two different points of a fluid passageway comprising:

reference means displaceable in response to force applied thereto;
means for applying a fluid pressure from a first point of the passageway to said reference means to create a first force acting thereon;
means for obtaining a pressure differential between the fluid pressures taken from said first point and a second point of the passageway and applying said pressure differential to said reference means to create a differential force acting on said reference simultanuously with said first force;
means coupled to said reference means for transmitting the amount of displacement of the reference means in proportion to the sum of the first force and differential force;
and means responsive to an atmospheric pressure drop below a predetermined value, said atmospheric responsive means including means for applying an additional force to said reference means when the atmospheric pressure decreases below the predetermined value to adjust the amount of displacement of the reference means once the atmospheric pressure has decreased below the predetermined value.

2 more elements

A control device responsive to fluid pressure taken from at least two points of a fluid passageway comprising:

a housing having a cavity;
a diaphragm extending across said cavity to provide a pair of separate cavity portions, a reference means disposed in one of said cavity portions, said reference means including a sealed bellows means and a resilient means of a predetermined force and being displaceable by a fluid pressure applied thereto;
linkage means connected to said reference means extending out of said housing for movement in response to any displacement of the reference means;
means applying a fluid pressure from a first point of the passageway into said one cavity portion to act on one side of said diaphragm and to create a pressure force acting on said reference means;
means for applying a fluid pressure obtained from a second point on the passageway to the other of said pair of cavity portions to act on the other side of the diaphragm to create a differential force on said diaphragm;
and means transferring the differential force applied to said diaphragm to said reference means whereby displacement of said reference means is caused by the pressure force and differential force applied to the diaphragm and said reference means is displaced when the sum of the forces applied thereagainst exceeds a predetermined value.

3 more elements

Dependencies are inferred from the claim text.

Control unit and method

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Control unit and method

Life of this patent

Abstract

Claims6