Fuel properties detecting apparatus for an internal combustion engine
First Claim
1. A fuel properties detecting apparatus for an internal combustion engine wherein an intake air quantity and an air-fuel ratio in exhaust gas are measured, a basic fuel injection quantity is calculated on the basis of said intake air quantity, and an amount of fuel to be injected is feed-back controlled in response to said air-fuel ratio, comprising:
- a pressure detecting means to detect an inner pressure of a cylinder,a crank angle detecting means to detect a crank angle of the engine, anda control device comprising means for receiving signals from said pressure detecting means and said crank angle detecting means to thereby calculate an effective calorific value Q of fuel in an ignition cycle on the basis of an inner pressure of a cylinder P(θ
) at a crank angle in compression and expansion strokes in an ignition cycle, a crank angle θ and
a cylinder capacity V(θ
), and to obtain an effective combustion rate K or a low level calorific value Hu of fuel, whereby said control device further comprises means for detecting fuel properties by using at least one of said effective combustion rate K said low level calorific value, Hu, and a ratio of a fuel injection pulse width Ti to said low level calorific value Hu (Ti/Hu).
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Accused Products
Abstract
A fuel properties detecting aparatus for an internal combustion engine has a pressure detector to detect an inner pressure of cylinder, a crank angle detector to detect a crank angle of engine, and a control device which is adapted to receive signals from the pressure detector and the crank angle detector to thereby calculate an effective calorific value Q of fuel in an ignition cycle on the basis of an inner pressure of a cylinder P(θ) at a crank angle in compression and expansion strokes in an ignition cycle, a crank angle θ and a cylinder capacity V(θ), and to obtain an effective combustion rate K or a low level calorific value Hu of fuel. Fuel properties are detected by using at least one of the effective combustion rate K and the low level calorific value Hu, or a ratio of a fuel injection pulse width Ti to the low level calorific value Hu (Ti/Hu).
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Citations
6 Claims
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1. A fuel properties detecting apparatus for an internal combustion engine wherein an intake air quantity and an air-fuel ratio in exhaust gas are measured, a basic fuel injection quantity is calculated on the basis of said intake air quantity, and an amount of fuel to be injected is feed-back controlled in response to said air-fuel ratio, comprising:
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a pressure detecting means to detect an inner pressure of a cylinder, a crank angle detecting means to detect a crank angle of the engine, and a control device comprising means for receiving signals from said pressure detecting means and said crank angle detecting means to thereby calculate an effective calorific value Q of fuel in an ignition cycle on the basis of an inner pressure of a cylinder P(θ
) at a crank angle in compression and expansion strokes in an ignition cycle, a crank angle θ and
a cylinder capacity V(θ
), and to obtain an effective combustion rate K or a low level calorific value Hu of fuel, whereby said control device further comprises means for detecting fuel properties by using at least one of said effective combustion rate K said low level calorific value, Hu, and a ratio of a fuel injection pulse width Ti to said low level calorific value Hu (Ti/Hu). - View Dependent Claims (2, 3, 4, 5, 6)
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Specification