Proportional flow venturi vacuum system for an internal combustion engine

摘要

A vacuum assist system attaches to an intake line and an intake manifold of an internal combustion engine having a throttle. The vacuum assist system includes a venturi valve, a reservoir, and a proportionally controlled valve. The proportionally controlled valve is movable between an open position and a closed position. The proportionally controlled valve moved to the open position when the throttle is in the partially open position such that air is flows from the inlet to the intake manifold, from the inlet to the venturi valve, from the venturi valve to the intake manifold, and from the reservoir to the venturi valve. The proportionally controlled valve moves to the closed position when the throttle is in the almost-closed position such that air flows from the inlet to the intake manifold via the intake line and from the reservoir to the intake manifold to reduce the pressure within the reservoir.

主权项

1. A powertrain comprising: a combustion chamber configured for combusting an air and fuel mixture;
a throttle movable between a partially opened position and an almost-closed position to selectively vary the flow of air therethrough; an intake manifold operatively attached to the combustion chamber and configured to receive air from the throttle and supply the air to the combustion chamber; wherein a manifold vacuum is generated in the intake manifold in response to combustion of the air and fuel mixture in the combustion chamber; an intake line extending between an inlet and the intake manifold, wherein the throttle is operatively disposed along the intake line; a venturi valve operatively connected between the intake line and the intake manifold; a pressure reservoir fluidly connected between the intake manifold and the venturi valve; and a proportionally controlled valve operatively connected between the intake manifold and the venturi valve; wherein the proportionally controlled valve is movable between an open position and a closed position; wherein the proportionally controlled valve is configured to move to the open position in response to the throttle being in the partially open position such that air flows from the inlet to the intake manifold via the intake line, from the inlet to the venturi valve, from the venturi valve to the intake manifold, and from the pressure reservoir to the venturi valve to reduce the pressure within the reservoir; and wherein the proportionally controlled valve is configured to move to the closed position in response to the throttle being in the almost-closed position such that air flows from the inlet to the intake manifold via the intake line and from the pressure reservoir to the intake manifold to reduce the pressure within the reservoir.