1. A system for controlling fuel delivery through a fuel injection system of an internal combustion engine, comprising:
an internal combustion engine, comprising:
a plurality of cylinders,
an air intake system with a plurality of intake runners, each intake runner corresponding to one of the plurality of cylinders and fluidly attached thereto, and,
a fuel injection system comprising a plurality of fuel injectors, each fuel injector fluidly connected and operable to deliver a quantity of fuel to one of the plurality of intake runners, and operably connected to an engine controller;
wherein the engine controller is operable to:
calculate a mass of fuel for delivery to one of the plurality of cylinders through one of the plurality of fuel injectors, based upon the operation of the internal combustion engine,
determine gas temperature in the cylinder;
select a compensation term based upon the calculated mass of fuel and the determined gas temperature in the cylinder;
adjust the calculated mass of fuel using the compensation term; and,
control an open time of each fuel injector based upon the adjusted calculated mass of fuel, such that the adjusted calculated mass of fuel is delivered to the one of the plurality of cylinders.
2. The system of claim 1, wherein the internal combustion engine is a port fuel injection spark-ignition engine.
3. The system of claim 1, wherein the internal combustion engine is a spark-ignition engine designed to operate primarily at stoichiometry.
4. The system of claim 1, wherein the internal combustion engine is a direct-injection spark-ignition engine.
5. The system of claim 1, wherein the internal combustion engine is a combustion-ignition engine.
6. A method to control delivery of fuel to an internal combustion engine, comprising:
calculating a mass of fuel for delivery to a cylinder of the internal combustion engine;
determining an intake gas temperature in the cylinder;
selecting a compensation term based upon the calculated mass of fuel and the determined gas temperature to the cylinder;
adjusting the calculated mass of fuel for delivery with the selected compensation term; and,
delivering an amount of fuel to the internal combustion engine based upon the adjusted calculated mass of fuel for delivery.
7. The method of claim 6, wherein selecting a compensation term based upon the calculated mass of fuel and the determined gas temperature in the cylinder comprises selecting the compensation term from a calibration table containing a matrix of compensation terms.
8. The method of claim 7, wherein each compensation term from the matrix of compensation terms contained in the calibration table is generated using a representative engine, comprising:
operating the representative engine at one of a series of operating conditions;
measuring temperature of a fuel injector of the representative engine;
measuring temperature of an intake runner of the representative engine in which the fuel injector is inserted;
measuring the engine airfuel ratio; and,
determining a scalar compensation term necessary to maintain the engine airfuel ratio near stoichiometry at the measured fuel injector temperature and the measured intake runner temperature.
9. The method of claim 6, wherein adjusting the calculated mass of fuel for delivery with the compensation term comprises multiplying the calculated mass of fuel by the selected compensation term.
10. The method of claim 6, wherein delivering an amount of fuel to the internal combustion engine based upon the adjusted calculated mass of fuel for delivery comprises controlling open time of a fuel injector operable to deliver a quantity of fuel to the intake runner based upon the adjusted calculated mass of fuel, such that the adjusted calculated mass of fuel is delivered to the cylinder.
11. The method of claim 6, wherein determining gas temperature in the cylinder comprises estimating the gas temperature in the intake runner of the cylinder based upon engine operating conditions and engine calibrations.
12. The method of claim 6, wherein determining gas temperature in the cylinder comprises estimating a temperature of an intake valve.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A water redispersible polymer powder (RDP) composition comprising an admixture of a water insoluble film-forming polymer which is carboxylated and from 2% by weight to 20% by weight, based upon the weight of the water insoluble film-forming polymer of a colloidal stabilizer, said film forming polymer comprising a carboxylated styrene-butadiene copolymer, and said colloidal stabilizer comprising a combination of a polyvinyl alcohol having an alkyl end chain of from 6 carbon atoms to 20 carbon atoms (alkyl modified polyvinyl alcohol) and an unmodified polyvinyl alcohol wherein the amount of the alkyl modified polyvinyl alcohol is from 5% by weight to 70% by weight based on the weight of the colloidal stabilizer,
optionally, the water redispersible polymer powder composition further comprising cement ingredients in a dry mix formulation of the water redispersible polymer powder in an amount of at least 0.1% by weight, based upon the weight of the dry mix formulation.
2. The water redispersible polymer powder composition as claimed in claim 1 wherein the alkyl modified polyvinyl alcohol comprises a polyvinyl alcohol which is modified by reacting the polyvinyl alcohol with an alkylthiol.
3. The water redispersible polymer powder composition as claimed in claim 2 wherein the alkyl modified polyvinyl alcohol has a number average molecular weight of at least 2,500.
4. A method for producing a water redispersible polymer powder composition comprising drying an aqueous mixture of a water insoluble film-forming polymer and from 2% by weight to 20% by weight, based upon the weight of the water insoluble film-forming polymer of a colloidal stabilizer to obtain a water redispersible polymer powder, wherein the film forming polymer is carboxylated and comprises a carboxylated styrene-butadiene copolymer, and the colloidal stabilizer comprises a combination of a polyvinyl alcohol having an alkyl end chain of from 6 carbon atoms to 20 carbon atoms (alkyl modified polyvinyl alcohol) and an unmodified polyvinyl alcohol wherein the amount of the alkyl modified polyvinyl alcohol is from 5% by weight to 70% by weight based on the weight of the colloidal stabilizer.
5. The method for producing a water redispersible polymer powder composition as claimed in claim 4 wherein the alkyl modified polyvinyl alcohol comprises a polyvinyl alcohol which is modified by reacting the polyvinyl alcohol with an alkylthiol, and the water insoluble film-forming polymer is a copolymer comprising in copolymerized form, the monomers styrene, butadiene, and at least one ethylenically unsaturated mono-andor di-carboxylic acid, salts thereof, or mixtures thereof.
6. The method for producing a water redispersible polymer powder composition as claimed in claim 4 wherein the alkyl modified polyvinyl alcohol has a number average molecular weight of at least 2,500.