Fuel economizing system

Claim 2

A fuel economizing system comprising: constant speed control means for detecting the difference between the preset speed of a vehicle and the actual speed of said vehicle and for varying the opening of a throttle valve to reduce said difference to zero; fuel pattern setting means for detecing the operating condition of an internal combustion engine and for setting the quantity of fuel to be required by said engine; fuel pattern correcting means connected to said constant speed control means when said constant speed control means is in operation and to said fuel pattern setting means, said fuel pattern correcting means being adapted to correct said quantity of fuel to reduce it when said actual speed is not less than said preset speed and the variation of the quantity of fuel is not increasing; and fuel feeding means connected to said fuel pattern correcting means for feeding to said engine the quantity of fuel corrected by said fuel pattern correcting means, wherein the output of said fuel pattern setting means is connected directly to said fuel feeding means when said constant speed control means is not in operation.

Claim 3

The fuel economizing system of claim 1 further comprising ignition timing adjusting means for advancing the ignition timing of said engine by a predetermined amount when said constant speed control means is set into operation.

Claim 4

A fuel economizing system comprising: constant speed control means for controlling the opening condition of a throttle valve in response to the difference between a preset speed and an actual speed; fuel pattern setting means for detecting an operational condition of an internal combustion engine and for setting the quantity of fuel to be required by said engine in accordance with a predetermined fuel pattern; fuel pattern correcting means connected to said constant speed control means when said constant speed control means is in operation, and to said fuel pattern setting means, said fuel pattern correcting means being adapted to reduce said quantity of fuel set by said fuel pattern setting means when said actual speed is not less than said preset speed and the variation of said quantity of fuel is not increasing, said fuel pattern correcting means being adapted to operate only when said constant speed control means is in operation; and fuel feeding means connected to said fuel pattern correcting means for feeding to said engine the quantity of fuel corrected by said fuel pattern correcting means, said fuel feeding means feeding the fuel set by the fuel pattern setting means when the fuel pattern correcting means is not in operation.

Claim 5

A fuel economizing system comprising: constant speed control means for controlling the opening condition of a throttle valve in response to the difference between a preset speed and an actual speed; fuel pattern setting means for detecting an operational condition of an internal combustion engine and for setting the quantity of fuel to be required by said engine in accordance with a predetermined fuel pattern; fuel pattern correcting means connected to said constant speed control means when said constant speed control means is in operation, and to said fuel pattern setting means, said fuel pattern correcting means being adapted to reduce said quantity of fuel set by said fuel pattern setting means when said actual speed is not less than said preset speed and the variation of said quantity of fuel is not increasing, said fuel pattern correcting means being adapted to operate only when said constant speed control means is in operation; and fuel feeding means connected to said fuel pattern correcting means for feeding to said engine the quantity of fuel corrected by said fuel pattern correcting means, said fuel feeding means feeding the fuel set by the fuel pattern setting means when the fuel pattern correcting means is not in operation.

Claim 6

A system according to claim 3 further comprising ignition timing adjusting means for advancing the ignition timing of said engine by a predetermined amount when said constant speed control means is set into operation.

Claim 7

In an internal combustion engine for a vehicle having a plurality of combustion chambers and an intake manifold, a fuel economizing system comprising in combination: means for maintaining the speed of said vehicle substantially constant, said means including means for detecting the difference between a preset speed and the actual speed of said vehicle, and means responsive to said detecting means for varying the amount of air sucked in said intake manifold to reduce said detected difference toward zero, means for detecting at least one operating condition of said engine, means responsive to said detected operating condition for generating a fuel supply signal corresponding to the quantity of fuel required in said engine, means responsive to said fuel supply signal for feeding fuel to said engine, means for determining the change of quantity of fuel fed to said engine, and fuel supply correction means responsive to said change of quantity of fuel determining means and said speed difference detecting means for correcting said fuel supply signal corresponding to the fuel required in said engine to decrease said signal when the change of quantity of fuel fed to said engine is not increasing and the actual vehicle speed is greater than said preset speed, said fuel pattern correcting means being adapted to operate only when said constant speed control means is in operation and wherein said fuel feeding means feeds the fuel set by the fuel pattern setting means when the fuel pattern correcting means is not in operation.

Claim 8

In an internal combustion engine for a vehicle having a plurality of combustion chambers and an intake manifold, a fuel economizing system comprising in combination: means for maintaining the speed of said vehicle substantially constant, said means including means for detecting the difference between a preset speed and the actual speed of said vehicle, and means responsive to said detecting means for varying the amount of air sucked in said intake manifold to reduce said detected difference toward zero, means for detecting at least one operating condition of said engine, means responsive to said detected operating condition for generating a fuel supply signal corresponding to the quantity of fuel required in said engine, means responsive to said fuel supply signal for feeding fuel to said engine, means for determining the change of quantity of fuel fed to said engine, and fuel supply correction means responsive to said change of quantity of fuel determining means and said speed difference detecting means for correcting said fuel supply signal corresponding to the fuel required in said engine to decrease said signal when the change of quantity of fuel fed to said engine is not increasing and the actual vehicle speed is greater than said preset speed, said fuel pattern correcting means being adapted to operate only when said constant speed control means is in operation and wherein said fuel feeding means feeds the fuel set by the fuel pattern setting means when the fuel pattern correcting means is not in operation.

Claim 9

The fuel economizing system of claim 5 wherein said means for detecting at least one operating condition of said engine includes means for detecting the intake manifold pressure varying in accordance with the amount of air sucked.

Claim 10

The fuel economizing system of claim 5 wherein said means responsive to said fuel supply signal for feeding fuel to said engine comprises at least one fuel injector, said fuel injector injecting a quantity of fuel corresponding to said fuel supply signal.

Claim 11

The fuel economizing system of claim 5 wherein said fuel correction means responsive to said change of quantity of fuel determining means and said speed difference detecting means for correcting the fuel supply signal corresponding to the fuel required in said engine incrementally decreases said signal by a predetermined increment once in each of a succession of first predetermined periods of time when the change of quantity of fuel fed to said engine is not increasing and the actual vehicle speed is greater than said preset speed and incrementally increases by a preset increment said signal once in each of a succession of second predetermined periods of time when the change of quantity of fuel fed to said engine is increasing and the actual speed of said vehicle is less than said preset speed, said first periods of time being greater than said second periods of time.

Claim 12

The fuel economizing system of claim 5 wherein said means responsive to said fuel supply signal for feeding fuel to said engine comprises at least one fuel injector, pressurized means for conveying a predetermined charge of fuel to said injector under pressure in synchronism with the rotation of the crankshaft of said engine and means responsive to said fuel supply signal for varying the quantity of charge formed in said charge forming means.

Claim 13

The fuel economizing system of claim 5 wherein said fuel supply correction means further increases said fuel supply signal corresponding to the fuel required in said engine when the change of quantity of fuel fed to said engine is increasing and the actual speed of said vehicle is less than said preset speed.