Fuel injection control method for liquefied petroleum gas injection engine and apparatus thereof
First Claim
1. A fuel injection control method for a Liquefied Petroleum gas Injection (LPI) engine, comprising:
- detecting whether the engine has started;
determining amount of the engine revolution per unit time and fuel temperature if the engine has started;
determining fuel pressure on the basis of the determined amount of the engine revolution per unit time and fuel temperature;
determining the content of propane of Liquefied Petroleum Gas (LPG) fuel of the engine on the basis of the fuel temperature and fuel pressure; and
controlling the fuel injection time or injection period by using a map prepared according to fuel propane content.
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Abstract
Fuel injection control methods and systems and related apparatus for Liquefied Petroleum gas Injection (LPI) engine are provided. Preferred methods and systems determine the increased amount of engine revolution per unit time and fuel temperature during an initial engine start period; determine fuel pressure on the basis of such values; determines propane content of the engine fuel by consideration of the fuel pressure and fuel temperature of the P-T diagram of the fuel; and controls the fuel injection time and injection period by using a map prepared according to propane content. Preferred systems and methods of the invention need not include use of fuel pressure and temperature sensors that provide injection control conditions to an Engine Control Unit, thereby providing a simplified and more efficient apparatus.
21 Citations
10 Claims
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1. A fuel injection control method for a Liquefied Petroleum gas Injection (LPI) engine, comprising:
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detecting whether the engine has started; determining amount of the engine revolution per unit time and fuel temperature if the engine has started; determining fuel pressure on the basis of the determined amount of the engine revolution per unit time and fuel temperature; determining the content of propane of Liquefied Petroleum Gas (LPG) fuel of the engine on the basis of the fuel temperature and fuel pressure; and controlling the fuel injection time or injection period by using a map prepared according to fuel propane content. - View Dependent Claims (2, 3, 4, 5)
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6. A fuel injection control method for a Liquefied Petroleum gas Injection (LPI) engine, comprising:
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after the start of an LPI engine, determining the amount of engine revolution per unit time and fuel temperature of the engine; determining fuel pressure by consideration of the determined amount of the engine revolution per unit time and fuel temperature; determining the propane content of liquefied petroleum gas of the engine by consideration of the fuel temperature and fuel pressure; and controlling one or more fuel injection properties of the engine by using a map prepared with consideration of fuel propane content. - View Dependent Claims (7, 8)
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9. A fuel injection control apparatus for a Liquefied Petroleum gas Injection (LPI) engine, the apparatus comprising:
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a crank rpm sensor or a cam rpm sensor; a water coolant temperature sensor; an air temperature sensor; an air amount sensor; an Engine Control Unit; and an injector for injecting fuel by adjusting the opening and closing time and period of nozzle according to the operation of the driving circuit of said injector, wherein the Engine Control unit determines the content of propane contained in the fuel by consideration of the increased amount of engine revolution per unit time, temperature and pressure of the fuel by consideration of measured values from sensors and pre-inputted data, and the Engine Control Unit controls a driving circuit of an injector by a map prepared in consideration of propane content. - View Dependent Claims (10)
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Specification