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A method for computing the quantity of injected fuel for an automobile engine equipped with an electronically controlled fuel injection system and an apparatus for detecting an exchange period for lubricating oils and constitutional parts are capable of informing a driver of an exchange period for a

A method for computing the quantity of injected fuel for an automobile engine equipped with an electronically controlled fuel injection system and an apparatus for detecting an exchange period for lubricating oils and constitutional parts are capable of informing a driver of an exchange period for an engine oil per use of a proper fuel quantity by calculating a total of the accumulated quantity of injected fuel for the automobile engine equipped with the electronically controlled fuel injection system. The method and apparatus are also capable of informing the driver of the exchange period for various lubricating oils and constitutional parts in accordance with the number of exchange of the engine oil and of allowing-the driver to exchange various lubricating oils and constitutional parts on a basis of accurate information under in an optimum condition. The method and apparatus also prevent the driver from being confused and extend the life span of the automobile engine.

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What is claimed is: 1. A method for computing the quantity of injected fuel for an automobile engine equipped with an electronically controlled fuel injection system, the comprising the steps of: computing (step 101) a voltage(electric current) pulse width time per minute during operation at idle s

What is claimed is: 1. A method for computing the quantity of injected fuel for an automobile engine equipped with an electronically controlled fuel injection system, the comprising the steps of: computing (step 101) a voltage(electric current) pulse width time per minute during operation at idle speeds of 800 rpm by using a voltage(electric current) pulse width applied to an injector in two crank shaft revolution during operation at idle speeds of 800 rpm in a diesel engine; computing (step 102) a quantity of injected fuel per the voltage(electric current) pulse width time during operation at idle speeds of 800 rpm by using the voltage(electric current) pulse width time per minute during operation at idle speeds of 800 rpm, which is given by the step 101 and by using the total quantity of injected fuel per minute during operation at idle speeds of 800 rpm; computing (step 103) a fuel pressure transform constant by extracting the square root of a fuel pressure in the injector, which is corresponding to an output voltage of a fuel pressure sensor; computing (step 104) a selection scale by calculating the fuel pressure transform constant given by the step 103 and an accumulated voltage(electric current) pulse width time; and computing (step 105) the total quantity of injected fuel for the diesel engine by using the selection scale given by the step 104 and the quantity of injected fuel per the voltage (electric current) pulse width time during operation at idle speeds of 800 rpm. 2. A method for computing the quantity of injected fuel for an automobile engine equipped with an electronically controlled fuel injection system, the comprising the steps of: computing (step 301) the total quantity of injected fuel for a gasoline engine after driving the automobile by a distance of 5,000 km by using a quantity of fuel injected from one injector per one minute in the gasoline engine and by using a fuel efficiency of the automobile; computing (step 302) an accumulated fuel injection time per one injector after driving the automobile by a distance of 5,000 km by using the total quantity of injected fuel for the gasoline engine after driving the automobile by a distance of 5,000 km, which is given by the step 301, and by using a quantity of fuel injected from one injector per one minute and by using the number of cylinders in the gasoline engine; computing (step 303) a selection scale by multiplying the accumulated fuel injection time per one injector, which is given by the step 302, with ten times; and computing (step 304) the total quantity of injected fuel for the gasoline engine by using the accumulated fuel injection time per one injector, which is given by the step 302, and by using the selection scale given by the step 303. 3. An apparatus for detecting an exchange period for lubricating oils and constitutional parts in an automobile engine equipped with an electronically controlled fuel injection system, in which the automobile engine includes an injector for injecting a fuel according to a control signal of an electronic control unit, the apparatus comprising: a wave shaping circuit for shaping a fuel injection signal of the electronic control unit and then for outputting a pulse being connected to the injector; a MPU for computing the pulse generated from the wave shaping circuit, for adding up and calculating a quantity of injected fuel, for informing an exchange period for an engine oil to a driver in accordance with the quantity of injected fuel, for informing an exchange period for lubricating oil and parts in proportion to the number of replacement for the engine oil; a selection scale dial for setting the exchange period for the engine oil under severe operating conditions in accordance with the kind of automobile, the selection scale dial being connected to an input terminal of the MPU; an up/down button for enabling the driver to ascertain the exchange period for various lubricating oils and parts by selectively setting the kinds of the various lubricating oils and the parts, the up/down button being connected to an input terminal of the MPU; a display part including a fuel quantity displaying part for displaying the quantity of injected fuel in the automobile as a numeral value, a lamp displaying part for displaying the number of replacement for the engine oil as a lamp, an exchange part display portion for displaying the parts to be exchanged as a letter, and a speaker for alarming the exchange period for various oils and parts as a sound, the display part being connected to an output terminal of the MPU; and a drain switch for initializing the lamp displaying part by being separated from an engine oil fan and being contacted therewith during exchange of the engine oil, the drain switch being connected to the input terminal of the MPU. 4. The apparatus for detecting an exchange period for lubricating oils and constitutional parts in an automobile engine equipped with an electronically controlled fuel injection system as claimed in claim 3, wherein a mode selecting part is connected to the input terminal of the MPU and includes a voltage selecting switch for enabling a user to select a voltage waveform generated from the injector and an electric current selecting switch for enabling the user to select an electric current waveform generated from an electric current core sensor. 5. The apparatus for detecting an exchange period for lubricating oils and constitutional parts in an automobile engine equipped with an electronically controlled fuel injection system as claimed in claim 3, wherein the drain switch is provided with a groove-shaped washer, in which a circumferential groove is formed along the circumference of the groove-shaped washer and a conductive wire is introduced and wound into the groove, wherein the groove-shaped washer is engaged with or released from the engine oil fan by means of a drain bolt.