Method and device for automatic injection of an additive into the fuel tank of a motor vehicle
First Claim
1. A method for automatic injection of an additive into the fuel tank of a motor vehicle, from a on-board additive tank, said method comprising the steps of:
- determining the quantity of additive to be withdrawn from the additive tank using an on-board computation unit as a function of (i) the variation in level of the fuel in the fuel tank following refueling, and (ii) a predetermined proportion set-point; and
injecting the thus determined quantity of additive by pulsed atomization directly into the liquid bulk of the fuel in said fuel tank.
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Accused Products
Abstract
A method and apparatus for the automatic injection of an additive into the fuel tank of a motor vehicle, from an on-board additive tank in which the quantity of additive to be withdrawn from the additive tank is determined using an on-board computation unit, and the quantity of additive thus determined is injected by pulsed atomization, this atomization being carried out directly into the liquid bulk of the fuel. This pulsed atomization is preferably carried out by controlling a positive-displacement piston, where the number of strokes of the piston which is automatically determined as a function of the quantity of the additive to be withdrawn.
42 Citations
14 Claims
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1. A method for automatic injection of an additive into the fuel tank of a motor vehicle, from a on-board additive tank, said method comprising the steps of:
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determining the quantity of additive to be withdrawn from the additive tank using an on-board computation unit as a function of (i) the variation in level of the fuel in the fuel tank following refueling, and (ii) a predetermined proportion set-point; and injecting the thus determined quantity of additive by pulsed atomization directly into the liquid bulk of the fuel in said fuel tank. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for automatically injecting an additive into the fuel tank of a motor vehicle, from an on-board additive tank, said apparatus comprising, in combination:
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a) a fuel tank; b) an additive injection circuit connected to said additive tank and connectable to a vehicle fuel tank, comprising; bi) a reciprocating positive-displacement pump having an inlet and an outlet; bii) means connecting said additive tank to said pump inlet effective to withdraw a predetermined quantity of additive from the additive tank; biii) a discharge pipe having first and second ends, said first end being connected to the outlet of said pump and the second end being adapted to extend into said fuel tank; and biv) an atomization member mounted on the second end of the discharge pipe, said atomization member and said discharge pipe defining means for carrying-out a pulsed atomization of additive directly into the liquid bulk of the fuel in said fuel tank; and c) an on-board computation unit capable of determining the quantity of additive to be withdrawn from the additive tank and controlling the actuation of the reciprocating positive-displacement pump as a function of the quantity of additive thus determined. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification