Purge pump control systems and methods
First Claim
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1. A fuel vapor control system for a vehicle, comprising:
- a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle;
a purge valve that opens to allow fuel vapor flow to an intake system of an engine and that closes to prevent fuel vapor flow to the intake system of the engine;
an electrical pump that pumps fuel vapor from the fuel vapor canister to the purge valve;
a vent valve that allows fresh air flow to the fuel vapor canister when the vent valve is open and that prevents fresh air flow to the fuel vapor canister when the vent valve is closed; and
a purge control module that controls a speed of the electrical pump, opening of the purge valve, and opening of the vent valve;
a pressure sensor that measures a pressure within a conduit at a location between the electrical pump and the purge valve,wherein the purge control module comprises;
a closed-loop (CL) module that determines a CL adjustment value based on a difference between (i) a first target pressure at the location between the electrical pump and the purge valve and (ii) the pressure measured using the pressure sensor at the location between the electrical pump and the purge valve;
a summer module that determines a second target based on a sum of the CL adjustment value and a target feed forward (FF) value;
a purge valve control module that controls the opening of the purge valve based on the second target; and
a motor control module that controls the speed of the electrical pump based on the second target.
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Abstract
A fuel vapor control system for a vehicle includes a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle. A purge valve opens to allow fuel vapor flow to an intake system of an engine and closes to prevent fuel vapor flow to the intake system of the engine. An electrical pump pumps fuel vapor from the fuel vapor canister to the purge valve. A vent valve allows fresh air flow to the vapor canister when the vent valve is open and prevents fresh air flow to the vapor canister when the vent valve is closed. A purge control module controls a speed of the electrical pump, opening of the purge valve, and opening of the vent valve.
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Citations
16 Claims
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1. A fuel vapor control system for a vehicle, comprising:
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a fuel vapor canister that traps fuel vapor from a fuel tank of the vehicle; a purge valve that opens to allow fuel vapor flow to an intake system of an engine and that closes to prevent fuel vapor flow to the intake system of the engine; an electrical pump that pumps fuel vapor from the fuel vapor canister to the purge valve; a vent valve that allows fresh air flow to the fuel vapor canister when the vent valve is open and that prevents fresh air flow to the fuel vapor canister when the vent valve is closed; and a purge control module that controls a speed of the electrical pump, opening of the purge valve, and opening of the vent valve; a pressure sensor that measures a pressure within a conduit at a location between the electrical pump and the purge valve, wherein the purge control module comprises; a closed-loop (CL) module that determines a CL adjustment value based on a difference between (i) a first target pressure at the location between the electrical pump and the purge valve and (ii) the pressure measured using the pressure sensor at the location between the electrical pump and the purge valve; a summer module that determines a second target based on a sum of the CL adjustment value and a target feed forward (FF) value; a purge valve control module that controls the opening of the purge valve based on the second target; and a motor control module that controls the speed of the electrical pump based on the second target. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A fuel vapor control method for a vehicle, comprising:
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by a fuel vapor canister, trapping fuel vapor from a fuel tank of the vehicle; selectively opening a purge valve to allow fuel vapor flow to an intake system of an engine; selectively closing the purge valve to prevent fuel vapor flow to the intake system of the engine; pumping fuel vapor from the fuel vapor canister to the purge valve using an electrical pump; selectively opening a vent valve to allow fresh air flow to the fuel vapor canister; selectively closing the vent valve to prevent fresh air flow to the fuel vapor canister; measuring, using a pressure sensor, a pressure within a conduit at a location between the electrical pump and the purge valve; determining a closed-loop (CL) adjustment value based on a difference between (i) a first target pressure at the location between the electrical pump and the purge valve and (ii) the pressure measured using the pressure sensor at the location between the electrical pump and the purge valve; determining a second target based on a sum of the CL adjustment value and a target feed forward (FF) value; controlling opening of the purge valve based on the second target; controlling a speed of the electrical pump based on the second target; and controlling opening of the vent valve. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification