Gaseous fuel injection system for internal combustion engines
First Claim
1. A mechanical-pneumatic gaseous fuel injection system for an internal combustion engine having an air intake system including an air intake passage and a throttle valve, the system being characterized by:
- (a) air pressure differential generating means for disposition in the air intake passage, the generating means creating a pressure which decreases below that in the air intake passage upstream of the generating means in proportion to the increase in the rate of air flow through the air intake passage;
(b) a variable-pressure-controller for gaseous fuel, the controller including;
(i) a housing;
(ii) first, second, third and fourth chambers disposed in the housing, the first and second chambers being separated by a first wall movable in opposite directions responsive to pressure thereon, the third and fourth chambers being separated by a second wall movable in opposite directions responsive to pressure thereon, the first chamber being fluid connectable to said air intake passage upstream of the pressure differential generating means and the second chamber being fluid connectable to the pressure differential generating means;
(iii) a gaseous fuel valve disposed at the housing and forming a portion of a gaseous fuel passage for supply of gaseous fuel at above atmospheric pressure from primary regulator means to said air intake system;
(iv) valve operating means at the housing for opening and closing the fuel valve and operatively associated with the first and second movable walls effective so that progressive movement of the first movable wall in one direction progressively opens the fuel valve and progressive movement of the second movable wall in one direction progressively closes the fuel valve;
(c) fuel flow restrictor means for forming a further portion of said passage between the gaseous fuel valve and said air intake system;
(d) the third controller chamber being fluid connectable to said air intake system; and
(e) the fourth controller chamber communicating with said passage between the fuel valve and the flow restrictor means.
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Accused Products
Abstract
A gaseous fuel injection system for internal combustion engines features a "variable-pressure-controller" which translates a varying negative pressure, sensed in the engine'"'"'s air intake system by means responsive to the rate of flow of the intake air, into a proportionately varying amount of gaseous fuel at a positive pressure. That fuel is then injected into the engine'"'"'s air intake system upstream or downstream of the throttle valve through flow restrictor means which cooperate with the variable-pressure-controller to provide an amount of fuel proportionate to the rate of air flow through the engine'"'"'s air intake system. The invention is entirely mechanical-pneumatic in operation and readily adapted to a wide variety of liquid fueled engines, carbureted as well as fuel injected, or to one for gaseous fuel only.
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Citations
28 Claims
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1. A mechanical-pneumatic gaseous fuel injection system for an internal combustion engine having an air intake system including an air intake passage and a throttle valve, the system being characterized by:
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(a) air pressure differential generating means for disposition in the air intake passage, the generating means creating a pressure which decreases below that in the air intake passage upstream of the generating means in proportion to the increase in the rate of air flow through the air intake passage; (b) a variable-pressure-controller for gaseous fuel, the controller including; (i) a housing; (ii) first, second, third and fourth chambers disposed in the housing, the first and second chambers being separated by a first wall movable in opposite directions responsive to pressure thereon, the third and fourth chambers being separated by a second wall movable in opposite directions responsive to pressure thereon, the first chamber being fluid connectable to said air intake passage upstream of the pressure differential generating means and the second chamber being fluid connectable to the pressure differential generating means; (iii) a gaseous fuel valve disposed at the housing and forming a portion of a gaseous fuel passage for supply of gaseous fuel at above atmospheric pressure from primary regulator means to said air intake system; (iv) valve operating means at the housing for opening and closing the fuel valve and operatively associated with the first and second movable walls effective so that progressive movement of the first movable wall in one direction progressively opens the fuel valve and progressive movement of the second movable wall in one direction progressively closes the fuel valve; (c) fuel flow restrictor means for forming a further portion of said passage between the gaseous fuel valve and said air intake system; (d) the third controller chamber being fluid connectable to said air intake system; and (e) the fourth controller chamber communicating with said passage between the fuel valve and the flow restrictor means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A variable-pressure-controller for use in a mechanical-pneumatic gaseous fuel injection system for an internal combustion engine, the controller being characterized by:
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(a) a housing; (b) first, second, third and fourth chambers disposed in the housing and having substantially no fluid communication therebetween within the housing, the first and second chambers being separated by a first wall movable in opposite directions responsive to pressure thereon, the third and fourth chambers being separated by a second wall movable in opposite directions responsive to pressure thereon; (c) an inlet to the first chamber, at last one inlet to the second chamber, and an inlet to the third chamber, each of said inlets being for connection into the air intake passage of an internal combustion engine; (d) a gaseous fuel inlet valve opening into the fourth chamber for supply of gaseous fuel under pressure to the fourth chamber; (e) a gaseous fuel outlet from the fourth chamber; (f) and valve operating means for opening and closing the fuel inlet valve and operatively associated with the first and second movable walls effective so that progressive movement of the first movable wall in one direction progressively opens the fuel inlet valve and progressive movement of the second movable wall in one direction progressively closes the inlet valve. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. A mechanical-pneumatic method of injecting gaseous fuel into an internal combustion engine having an air intake system including an air intake passage characterized by:
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(a) creating a first pressure differential in the air intake passage between a first pressure and a lesser second pressure, the first pressure differential proportionately increasing or decreasing as the rate of air flow through the air intake passage increases or decreases; (b) applying the first pressure to a first chamber; (c) applying the second pressure to a second chamber separate from the first chamber by a first wall movable in opposite directions responsive to pressure thereon, whereby a first force is imposed on the first movable wall; (d) creating a second pressure differential between a third chamber and a fourth chamber separated by a second wall movable in opposite directions responsive to pressure thereon, the second pressure differential being created by; (i) applying a third pressure to the third chamber; and (ii) applying a fourth pressure greater than the third pressure to the fourth chamber, the fourth pressure being generated by flow of gaseous fuel through a fuel passage connecting a source of said fuel at a positive pressure with the engine'"'"'s air intake system through gaseous fuel valve means and flow restrictor means, the fourth chamber communicating with the fuel passage upstream of the flow restrictor means, the flow restrictor means providing an increased or decreased restriction to flow of gaseous fuel proportionate to the increase or decrease of the first pressure differential, the fourth pressure and thus the second pressure differential thereby increasing or decreasing proportionate t the increase or decrease of the first pressure differential as the opening of the gaseous fuel valve means is increased or decreased, whereby a second force is imposed on the second movable wall; and (e) operatively associating the first and second movable walls with the gaseous fuel valve means so that the first force tends to open the valve means and the second force tends to close the valve means, the valve means assuming an open position when the first and second forces are equal. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification