Fuel system

Claim 2

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by said venturi means in response to selected changes in manifold vacuum; and said control means including a pair of branch passages having different fluid impedances therein to develop a control signal proportional to the rate of change of manifold vacuum.

Claim 3

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel deliVery established by said venturi means in response to selected changes in manifold vacuum; and said control means including a fluidic element having saturation limits operative to supply an augmenting fuel control signal within a selected range of values of manifold vacuum.

Claim 4

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel deliVery established by said venturi means in response to selected changes in manifold vacuum; and said control means including a fluidic element having saturation limits operative to supply an augmenting fuel control signal within a selected range of values of manifold vacuum.

Claim 5

A fuel control system as claimed in claim 2 wherein said proportional fluidic amplifier means includes at least one set of aligned and directionally-opposed control jets interconnected to one another to provide a gain control variable with pressure intensity applied in a balanced and opposed direction at said set of control jets, said interconnected set of control jets connected to said control means so that amplifier gain is varied in response to changed in manifold vacuum.

Claim 6

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: Proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; Venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by said venturi means in response to selected changes in manifold vacuum; and said proportional fluidic amplifier means including at least one set of aligned and directionally-opposed control jets interconnected to one another to provide a gain control variable with pressure intensity applied in a balanced and opposed direction at said set of control jets; said interconnected set of control jets connected to said control means so that amplifier gain is varied in response to changes in manifold vacuum.

Claim 7

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: Proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; Venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by said venturi means in response to selected changes in manifold vacuum; and said proportional fluidic amplifier means including at least one set of aligned and directionally-opposed control jets interconnected to one another to provide a gain control variable with pressure intensity applied in a balanced and opposed direction at said set of control jets; said interconnected set of control jets connected to said control means so that amplifier gain is varied in response to changes in manifold vacuum.

Claim 8

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by said venturi means in response to selected changes in manifold vacuum; said proportional fluidic amplifier means including at least two proportional interconnected fluidic amplifier elements providing two stages of amplification; said signal transmission means interconnecting said venturi means to one of said two proportional amplifier elements; and said control means connected to the other of said two proportional amplifier elements.

Claim 9

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by said venturi means in response to selected changes in manifold vacuum; said proportional fluidic amplifier means including at least two proportional interconnected fluidic amplifier elements providing two stages of amplification; said signal transmission means interconnecting said venturi means to one of said two proportional amplifier elements; and said control means connected to the other of said two proportional amplifier elements.

Claim 10

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluid amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; sigNal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by said venturi means in response to selected changes in manifold vacuum; idle port means in said intake manifold downstream of said throttle valve operative a strong vacuum at idle conditions; and passages means interconnecting said idle port means with said signal transmission means to modify and enrich fuel delivery at idle conditions.

Claim 11

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluid amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; sigNal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by said venturi means in response to selected changes in manifold vacuum; idle port means in said intake manifold downstream of said throttle valve operative a strong vacuum at idle conditions; and passages means interconnecting said idle port means with said signal transmission means to modify and enrich fuel delivery at idle conditions.

Claim 12

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by the venturi means in response to selected changes in manifold vacuum; and said control means including a monostable fluidic element operative to develop a fuel reduction controlling signal only about a predetermined high manifold vacuum reflective of engine deceleration.

Claim 13

A fuel control system for an engine having an air intake manifold and a throttle valve in said manifold comprising: proportional fluidic amplifier means having at least two control jets operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jets; venturi means adapted to be located in the intake manifold receiving air delivered to an engine operative to develop a control pressure which varies with variations in airflow through the venturi means; signal transmission means interconnecting said venturi means to one of said control jets to control fuel delivery in response to variations in airflow; control means connected to the other of said control jets having an opening communicating with manifold vacuum at a location downstream of the throttle valve to modify the fuel delivery established by the venturi means in response to selected changes in manifold vacuum; and said control means including a monostable fluidic element operative to develop a fuel reduction controlling signal only about a predetermined high manifold vacuum reflective of engine deceleration.

Claim 14

A fuel control system comprising: proportional fluidic amplifier means having a control jet operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jet; a saturable fluidic proportional amplifier having a pair of outlet passages and means normally biasing a fluid supply jet to one of said pair of outlet passages; said other of said pair of outlet passages connected to said control jet to supply a controlling fluid pressure to said proportional amplifier means; means responsive to a condition of engine demand supplying a control signal to said saturable proportional amplifier to thereby control fuel delivery during selected conditions of engine demand; said proportional fluidic amplifier means having a set of opposed interconnected control jets providing a gain control variable with fluid pressure supplied to said control jet; and said other of said outlet passages of said saturable proportional amplifier connected to said set of control jets to control amplifier gain in response to selected conditions of engine demand.

Claim 15

A fuel control system comprising: proportional fluidic amplifier means having a control jet operative to control fuel delivery to an engine in response to variations in fluid pressure supplied to said control jet; a saturable fluidic proportional amplifier having a pair of outlet passages and means normally biasing a fluid supply jet to one of said pair of outlet passages; said other of said pair of outlet passages connected to said control jet to supply a controlling fluid pressure to said proportional amplifier means; means responsive to a condition of engine demand supplying a control signal to said saturable proportional amplifier to thereby control fuel delivery during selected conditions of engine demand; said proportional fluidic amplifier means having a set of opposed interconnected control jets providing a gain control variable with fluid pressure supplied to said control jet; and said other of said outlet passages of said saturable proportional amplifier connected to said set of control jets to control amplifier gain in response to selected conditions of engine demand.

Claim 16

A fuel control system as claimed in claim 8 wherein the means responsive to engine demand manifold vacuum.