Intake-air amount detecting system for an internal combustion engine
First Claim
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1. An intake-air amount detecting system for an internal combustion engine comprising;
- a first temperature detecting means arranged in an air-intake path of an internal combustion engine for detecting the temperature of the intake-air to said engine;
an electrical heating means arranged in said intake path for heating said intake-air;
a second temperature detecting means arranged in said intake path for detecting the temperature of the intake-air having been heated by said electrical heating means;
tubular path means including a heat insulating material arranged to cover said first and second temperature detecting means and said electrical heating means;
a heat amount control means connected to said first and second temperature detecting means and said electrical heating means for controlling the amount of heat generated by said electrical heating means so as to continuously maintain a constant difference between the temperature of the heated intake-air and the non-heated intake-air; and
an operational circuit means for calculating the amount of heat generated by said electrical heating means to determine the amount of intake-air to said engine.
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Abstract
There is provided an intake-air amount detecting system for an internal combustion engine in which a first temperature of an intake air for an internal combustion engine is measured, the intake-air is heated by an electrical heating element, a second temperature of the heated intake-air is measured, an amount of heat generated by the electrical heating element is adjusted to maintain a difference between the second temperature and the first temperature at a fixed value, and the amount of heat generated by the heating element is calculated to determine the amount of the intake-air to the internal combustion engine.
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Citations
8 Claims
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1. An intake-air amount detecting system for an internal combustion engine comprising;
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a first temperature detecting means arranged in an air-intake path of an internal combustion engine for detecting the temperature of the intake-air to said engine; an electrical heating means arranged in said intake path for heating said intake-air; a second temperature detecting means arranged in said intake path for detecting the temperature of the intake-air having been heated by said electrical heating means; tubular path means including a heat insulating material arranged to cover said first and second temperature detecting means and said electrical heating means; a heat amount control means connected to said first and second temperature detecting means and said electrical heating means for controlling the amount of heat generated by said electrical heating means so as to continuously maintain a constant difference between the temperature of the heated intake-air and the non-heated intake-air; and an operational circuit means for calculating the amount of heat generated by said electrical heating means to determine the amount of intake-air to said engine. - View Dependent Claims (2, 3)
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4. An intake-air amount detecting system for an internal combustion engine comprising;
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a baffle of bell-mouthed shape arranged upstream of an intake pipe of an internal combustion engine for baffling the flow of intake-air; a first temperature dependent resistor arranged in said intake pipe for detecting the temperature of said intake-air to said engine; an electrical heater arranged in said intake pipe for heating said intake-air; a second temperature dependent resistor arranged in said intake pipe for detecting the temperature of the intake-air having been heated by said electrical heater; a manifold including a heat insulating material arranged to cover said first temperature dependent resistor, said electrical heater and said second temperature dependent resistor, said manifold having its upstream end so constructed that a fixed proportion of the intake-air passing through said intake pipe always flows into said manifold; reference dividing resistors cooperating with said first and second temperature dependent resistors to constitute respective arms of a bridge circuit; a heat amount control circuit connected to said bridge circuit and said electrical heater for controlling the amount of heat generated by said electrical heater such that a temperature difference between the temperatures detected by said first and second temperature dependent resistors is continuously maintained at a predetermined value; and an operational circuit for calculating the amount of heat generated by said electrical heater to determine the amount of the intake-air to the engine. - View Dependent Claims (5, 6, 7, 8)
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Specification