INTAKE AIR FLOW RATE DETECTION FOR INTERNAL COMBUSTION ENGINE
First Claim
1. An intake air flow rate detection device for an internal combustion engine, the engine comprising an intake passage through which intake air flows, a supercharging device that supercharges the intake air, a throttle that throttles the intake air downstream of the supercharging device, a bypass passage that bifurcates between the supercharging device and the throttle and converges with the intake passage upstream of the supercharging device, and a bypass valve that opens and closes the bypass passage, the detection device comprising:
- a sensor that detects an operating condition of the internal combustion engine;
an air flow meter that disposed in the intake passage upstream of the supercharging device; and
a programmable controller programmed to;
calculate a measured intake air flow rate from a detection value of the air flow meter;
calculate a calculated intake air flow rate from the operating condition of the internal combustion engine; and
employ either the measured intake air flow rate or the calculated intake air flow rate as an intake air flow rate of the intake passage on the basis of an air flow rate of air that is circulated to the intake passage between the air flow meter and the supercharging device through the bypass passage.
1 Assignment
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Accused Products
Abstract
An intake air flow rate detection device for an internal combustion engine (100), including a sensor (61, 63) that detects an operating condition of the internal combustion engine (100), an air flow meter (21) that disposed in the intake passage (20) upstream of the supercharging device (41), and a programmable controller (60) programmed to calculate a measured intake air flow rate from a detection value of the air flow meter (21), calculate a calculated intake air flow rate from the operating condition of the internal combustion engine (100), and employ either the measured intake air flow rate or the calculated intake air flow rate as an intake air flow rate of the intake passage (20) on the basis of an air flow rate of air that is circulated to the intake passage (20) between the air flow meter (21) and the supercharging device (41) through the bypass passage (51).
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Citations
10 Claims
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1. An intake air flow rate detection device for an internal combustion engine, the engine comprising an intake passage through which intake air flows, a supercharging device that supercharges the intake air, a throttle that throttles the intake air downstream of the supercharging device, a bypass passage that bifurcates between the supercharging device and the throttle and converges with the intake passage upstream of the supercharging device, and a bypass valve that opens and closes the bypass passage, the detection device comprising:
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a sensor that detects an operating condition of the internal combustion engine; an air flow meter that disposed in the intake passage upstream of the supercharging device; and a programmable controller programmed to; calculate a measured intake air flow rate from a detection value of the air flow meter; calculate a calculated intake air flow rate from the operating condition of the internal combustion engine; and employ either the measured intake air flow rate or the calculated intake air flow rate as an intake air flow rate of the intake passage on the basis of an air flow rate of air that is circulated to the intake passage between the air flow meter and the supercharging device through the bypass passage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An intake air flow rate detection method for an internal combustion engine, the engine comprising an intake passage through which intake air flows, a supercharging device that supercharges the intake air, a throttle that throttles the intake air downstream of the supercharging device, a bypass passage that bifurcates between the supercharging device and the throttle and converges with the intake passage upstream of the supercharging device, and a bypass valve that opens and closes the bypass passage, the method comprising:
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detecting an operating condition of the internal combustion engine; detecting an intake air flow rate using an air flow meter disposed in the intake passage upstream of the supercharging device; calculating a measured intake air flow rate from a detection value of the air flow meter; calculating a calculated intake air flow rate from the operating condition of the internal combustion engine; and employing either the measured intake air flow rate or the calculated intake air flow rate as an intake air flow rate of the intake passage on the basis of an air flow rate of air that is circulated to the intake passage between the air flow meter and the supercharging device through the bypass passage.
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10. An intake air flow rate detection device for an internal combustion engine, the engine comprising an intake passage through which intake air flows, a supercharging device that supercharges the intake air, a throttle that throttles the intake air downstream of the supercharging device, a bypass passage that bifurcates between the supercharging device and the throttle and converges with the intake passage upstream of the supercharging device, and a bypass valve that opens and closes the bypass passage, the detection device comprising:
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first means for detecting an operating condition of the internal combustion engine; second means for detecting an intake air flow rate in the intake passage upstream of the supercharging device; third means for calculating a measured intake air flow rate from a detection value of the second means; forth means for calculating a calculated intake air flow rate from the operating condition of the internal combustion engine; and fifth means for employing either the measured intake air flow rate or the calculated intake air flow rate as an intake air flow rate of the intake passage on the basis of an air flow rate of air that is circulated to the intake passage between the second means and the supercharging device through the bypass passage.
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Specification