Alternative liquid fuel injection system and method
First Claim
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1. A fuel injection system for an internal combustion engine having an intake manifold comprising:
- (a) means for supplying a gaseous fuel in a liquid state;
(b) means for receiving said fuel and injecting same in a liquid state directly into said intake manifold;
(c) means responsive to predetermined engine conditions for controlling the rate at which fuel is supplied to said manifold by said injecting means; and
(d) means for providing vaporized fuel for starting and idling conditions comprising bypass means for withdrawing up to 10% by volume of said fuel prior to injection, vaporizing the bypassed fuel and delivering same to said intake manifold, bypassing said injecting means.
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Abstract
A liquid fuel injection system for an internal combustion engine in which the fuel, gaseous under ambient conditions, is injected in liquid form under compression into the intake manifold of the engine. Fuel is controlled largely by intake manifold pressure together with the RPM of the engine. Some fuel bypasses the injector, is vaporized and fed into the intake manifold through a sleeve in sufficient amounts to maintain the engine at idle and low load conditions and prevent the injector from freezing.
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Citations
20 Claims
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1. A fuel injection system for an internal combustion engine having an intake manifold comprising:
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(a) means for supplying a gaseous fuel in a liquid state; (b) means for receiving said fuel and injecting same in a liquid state directly into said intake manifold; (c) means responsive to predetermined engine conditions for controlling the rate at which fuel is supplied to said manifold by said injecting means; and (d) means for providing vaporized fuel for starting and idling conditions comprising bypass means for withdrawing up to 10% by volume of said fuel prior to injection, vaporizing the bypassed fuel and delivering same to said intake manifold, bypassing said injecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. The method of controlling delivery of liquefied gaseous fuel to an internal combustion engine, said engine having an intake manifold and means for injecting said liquid fuel into said intake manifold, comprising the steps of:
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(a) regulating flow of fuel in liquid form to said injecting means in accordance with inlet manifold and liquid fuel pressures; (b) bypassing said injecting means with up to 10% by volume of said liquid fuel; (c) vaporizing the bypassed fuel; (d) delivering the vaporized bypassed fuel directly into said intake manifold, the amount of fuel bypassed and vaporized being used to start and maintain said engine at idle. - View Dependent Claims (17, 18, 19, 20)
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Specification