Fuel control device for internal combustion engine

Claim 2

A fuel control apparatus for use on vehicles powered by internal combustion engines equipped with standard components, such as a voltage source, accelerator, carburetor, ignition switch, forward gear switch, throttle linkage, accessory coil, accessory switch and idle fuel flow passage, comprising: a vacuum operated switch means operated by intake vacuum pressure of said internal combustion engine, said vacuum operated switch means being connected in series with said accessory switch and said forward gear switch to a first side of said voltage source, said vacuum operated switch means closing at a first predetermined intake vacuum and opening at a second predetermined intake vacuum, said first predetermined intake vacuum being greater than said second predetermined intake vacuum; transition switch means connected in series with said vacuum operated switch means, said transition switch means being operable by said throttle linkage of said vehicle to close if the accelerator of the vehicle is released; coil means of solenoid valve means connected in series with said transition switch means to a second side of said voltage source, said solenoid valve means being located in the idle fuel passage of said vehicle for interrupting fuel flow therethrough during deceleration if intake vacuum exceeds a first predetermined level and the accelerator is released; as long as the accelerator is released, said interruption of fuel flow will continue until intake vacuum drops to a second predetermined level.

Claim 3

The fuel control apparatus as given in claim 1 wherein said vacuum operated switch means is a spring loaded toggle-type switch, further including positive displacement switch means connected to said voltage source and operated by a vacuum diaphram device that receives intake vacuum pressure, said vacuum diaphram device also controlling said vacuum operated switch means, said positive displacement switch means being adjustable with respect to said vacuum diaphram device to close upon the vacuum reaching said second predetermined level, closure of said positive displacement switch means allowing air flow into said vacuum diaphram device to override said vacuum to open said vacuum operated switch means.

Claim 4

The fuel control apparatus as given in claim 2 wherein said positive displacement switch means includes air valve means energized by current flow through positive displacement contacts to allow air flow into said vacuum diaphram device, said air valve means being deenergized upon opening said vacuum operated switch means.

Claim 5

The fuel control apparatus as given in claim 1 including an anti-dieseling device connected in parallel to said coil means, anti-dieseling switching means connected across said ignition switch and in series with a time delay switch means, said time delay switch means opening a predetermined period of time after said ignition switch thereby energizing said coil means to close said solenoid valve means from the opening of said ignition switch until said predetermined period of time has passed to prevent dieseling.

Claim 6

The fuel control apparatus as given in claim 4 wherein said anti-dieseling switching means includes a relay coil in series with said time delay switch means, said relay coil closing a relay contact connecting said coil means to said voltage source.

Claim 7

The fuel control apparatus as given in claim 4 wherein said anti-dieseling switching means includes a transistor means for connecting said coil means to said voltage source, current flow through said transistor means to prevent dieseling being controlled by said time delay switch means.

Claim 8

The fuel control apparatus as given in claim 1 wherein said solenoid valve means is mounted in the idle fuel flow passage of the carburetor, said solenoid valve having a passage therethrough, said passage being closed upon energization of said coil means to move a plunger into said passage.

Claim 9

A fuel control apparatus for use on vehicles powered by internal combustion engines equipped with standard components, such as a voltage source, accelerator, carburetor, ignition switch means having normally opened contacts and normally closed contacts, and idle fuel flow passage, comprising: a vacuum operated switch means operated by intake vacuum pressure of said internal combustion engine, said vacuum operated switch means being connected in series with said normally opened contacts of said ignition switch means and said forward gear switch to a first side of said voltage source, said vacuum operated switch means closing at a first predetermined intake vacuum and opening at a second predetermined intake vacuum, said first predetermined intake vacuum being greater than said second predetermined intake vacuum; transition switch means connected in series with said vacuum operated switch means, said transition switch means being operable by said throttle linkage of said vehicle to close if the accelerator of the vehicle is released; coil means of solenoid valve means connected in series with said transition switch means to a second side of said voltage source, said solenoid valve means being located in the idle fuel passage of said vehicle for interrupting fuel flow therethrough during deceleration if intake vacuum exceeds a first predetermined level and the accelerator is released; as long as the accelerator is released, said interruption of fuel flow will continue until intake vacuum drops to a second predetermined level.

Claim 10

A fuel control apparatus for use on vehicles powered by internal combustion engines equipped with standard components, such as a voltage source, accelerator, carburetor, ignition switch means having normally opened contacts and normally closed contacts, and idle fuel flow passage, comprising: a vacuum operated switch means operated by intake vacuum pressure of said internal combustion engine, said vacuum operated switch means being connected in series with said normally opened contacts of said ignition switch means and said forward gear switch to a first side of said voltage source, said vacuum operated switch means closing at a first predetermined intake vacuum and opening at a second predetermined intake vacuum, said first predetermined intake vacuum being greater than said second predetermined intake vacuum; transition switch means connected in series with said vacuum operated switch means, said transition switch means being operable by said throttle linkage of said vehicle to close if the accelerator of the vehicle is released; coil means of solenoid valve means connected in series with said transition switch means to a second side of said voltage source, said solenoid valve means being located in the idle fuel passage of said vehicle for interrupting fuel flow therethrough during deceleration if intake vacuum exceeds a first predetermined level and the accelerator is released; as long as the accelerator is released, said interruption of fuel flow will continue until intake vacuum drops to a second predetermined level.

Claim 11

The fuel control apparatus as given in claim 8 including an anti-dieseling device connected in parallel to said coil means, anti-dieseling switching means connected in series with said normally closed contacts of said ignition switch to a second side of said voltage source, said anti-dieseling switching means also being in series with a time delay switch means, said time delay switch means opening a predetermined period of time after said ignition switch thereby energizing said coil means to close said solenoid valve means from turning OFF the ignition switch means until said predetermined period of time has passed to prevent dieseling.

Claim 12

The fuel control apparatus as given in claim 9 wherein said anti-dieseling switching means includes a relay coil in series with said time delay switch means, said relay coil closing a relay contact connecting said coil means to said voltage source.

Claim 13

The fuel control apparatus as given in claim 9 wherein said anti-dieseling switching means includes a transistor means for connecting said coil means to said voltage source, current flow through said transistor means to prevent dieseling being controlled by said time delay switch means.