초록 ▼

A fuel control system of a vehicle includes a first storing module that, in response to receipt of a vehicle shutdown command, stores a first temperature of liquefied petroleum gas (LPG) within an LPG fuel rail of an engine and a first pressure of LPG within the LPG fuel rail. A second storing modul

A fuel control system of a vehicle includes a first storing module that, in response to receipt of a vehicle shutdown command, stores a first temperature of liquefied petroleum gas (LPG) within an LPG fuel rail of an engine and a first pressure of LPG within the LPG fuel rail. A second storing module, in response to receipt of a vehicle startup command, stores a second temperature of LPG within the LPG fuel rail and a second pressure of LPG within the LPG fuel rail. A butane module determines an amount of butane in the LPG based on the first temperature, the first pressure, the second temperature, and the second pressure. A fuel control module controls LPG fueling of the engine based on the amount of butane in the LPG.

대표청구항 ▼

1. A fuel control system of a vehicle, comprising: a first storing module that, in response to receipt of a vehicle shutdown command, stores a first temperature of liquefied petroleum gas (LPG) within an LPG fuel rail of an engine and a first pressure of LPG within the LPG fuel rail;a second storing

1. A fuel control system of a vehicle, comprising: a first storing module that, in response to receipt of a vehicle shutdown command, stores a first temperature of liquefied petroleum gas (LPG) within an LPG fuel rail of an engine and a first pressure of LPG within the LPG fuel rail;a second storing module that, in response to receipt of a vehicle startup command, stores a second temperature of LPG within the LPG fuel rail and a second pressure of LPG within the LPG fuel rail;a butane module that determines an amount of butane in the LPG based on the first temperature, the first pressure, the second temperature, and the second pressure; anda fuel control module that controls LPG fueling of the engine based on the amount of butane in the LPG. 2. The fuel control system of claim 1 further comprising a shutoff valve module that transitions a LPG shutoff valve from open to closed when the vehicle shutdown command is received and that transitions the LPG shutoff valve from closed to open when the vehicle startup command is received, wherein the LPG shutoff valve enables or disables LPG flow from an LPG tank to an LPG fuel rail of the engine,wherein the first storing module stores the first temperature and pressure after the LPG shutoff valve is closed, andwherein the second storing module stores the second temperature and pressure after the vehicle startup command is received and before the LPG shutoff valve is opened. 3. The fuel control system of claim 1 wherein the fuel control module disables LPG fueling of the engine for a period after the vehicle startup command is received when the amount of butane in the LPG is greater than a predetermined amount. 4. The fuel control system of claim 3 wherein the fuel control module performs gasoline fueling of the engine during the period after the vehicle startup command is received when the amount of butane in the LPG is greater than the predetermined amount. 5. The fuel control system of claim 3 further comprising a heater module that powers an LPG heater for the period after the vehicle startup command is received when the amount of butane in the LPG is greater than the predetermined amount. 6. The fuel control system of claim 3 further comprising a diagnostic module that diagnoses a fault in a component of the vehicle, that illuminates a malfunction indicator lamp when the fault is diagnosed, and that disables the diagnosis after the vehicle startup command is received when the amount of butane in the LPG is greater than the predetermined amount and a temperature is less than a predetermined temperature. 7. The fuel control system of claim 3 wherein the fuel control module increases the period as the amount of butane in the LPG increases. 8. The fuel control system of claim 3 wherein the fuel control module decreases the period as the amount of butane in the LPG decreases. 9. The fuel control system of claim 1 wherein the vehicle does not include a pressure sensor within an LPG tank. 10. The fuel control system of claim 1 wherein the butane module determines an expected pressure based on a predetermined amount of butane, the first temperature, the first pressure, and the second temperature, and indicates whether the amount of butane in the LPG is greater than or less than the predetermined amount of butane based on a comparison of the second pressure and the expected pressure. 11. A fuel control method for a vehicle, comprising: in response to receipt of a vehicle shutdown command, storing (i) a first temperature of liquefied petroleum gas (LPG) within an LPG fuel rail of an engine and (ii) a first pressure of LPG within the LPG fuel rail;in response to receipt of a vehicle startup command, storing (i) a second temperature of LPG within the LPG fuel rail and (ii) a second pressure of LPG within the LPG fuel rail;determining an amount of butane in the LPG based on the first temperature, the first pressure, the second temperature, and the second pressure; andcontrolling LPG fueling of the engine based on the amount of butane in the LPG. 12. The fuel control method of claim 11 further comprising: transitioning a LPG shutoff valve from open to closed when the vehicle shutdown command is received; andtransitioning the LPG shutoff valve from closed to open when the vehicle startup command is received,wherein the LPG shutoff valve enables or disables LPG flow from an LPG tank to an LPG fuel rail of the engine,wherein storing the first temperature and pressure includes storing the first temperature and pressure after the LPG shutoff valve is closed, andwherein storing the second temperature and pressure includes storing the second temperature and pressure after the vehicle startup command is received and before the LPG shutoff valve is opened. 13. The fuel control method of claim 11 further comprising disabling LPG fueling of the engine for a period after the vehicle startup command is received when the amount of butane in the LPG is greater than a predetermined amount. 14. The fuel control method of claim 13 further comprising performing gasoline fueling of the engine during the period after the vehicle startup command is received when the amount of butane in the LPG is greater than the predetermined amount. 15. The fuel control method of claim 13 further comprising powering an LPG heater for the period after the vehicle startup command is received when the amount of butane in the LPG is greater than the predetermined amount. 16. The fuel control method of claim 13 further comprising disabling diagnosis of a fault in a component of the vehicle after the vehicle startup command is received when the amount of butane in the LPG is greater than the predetermined amount and a temperature is less than a predetermined temperature. 17. The fuel control method of claim 13 further comprising increasing the period as the amount of butane in the LPG increases. 18. The fuel control method of claim 13 further comprising decreasing the period as the amount of butane in the LPG decreases. 19. The fuel control method of claim 11 wherein the vehicle does not include a pressure sensor within an LPG tank. 20. The fuel control method of claim 11 further comprising: determining an expected pressure based on a predetermined amount of butane, the first temperature, the first pressure, and the second temperature; andindicating whether the amount of butane in the LPG is greater than or less than the predetermined amount of butane based on a comparison of the second pressure and the expected pressure.