A method for determining the atmospheric pressure for a combustion engine having a cylinder, a throttle valve and an air intake valve admitting air into the cylinder, as well as a pressure sensor between the throttle valve and the intake valve. The method including the following steps: measuring a…
Please substitute the new Abstract submitted herewith for the original Abstract: A method for determining a fresh-air-mass parameter in a cylinder of an internal combustion engine in a motor vehicle includes identifying a cylinder which is at the end of an intake stroke or at the beginning of a…
A vehicle drive has an internal combustion engine, an air conduit system, an exhaust system and a diagnostic unit for identifying a leak in the air conduit system of the internal combustion engine. The diagnostic unit is designed to carry out a method for diagnosing a leak in an internal combustion…
The internal-combustion-engine control apparatus has an intake-air-temperature correction control apparatus including a first-order advance compensation means that calculates an advance-compensation amount for an intake-air temperature detection signal, a time constant determination means that…
In the present invention, a clogging rate is calculated using a first flow rate function when the degree of clogging of the throttle valve is in the reference state and a second flow rate function estimated based on the intake air volume. For each predetermined period, sample points, which are…
A fuel injection control apparatus of a four cycle engine having three cylinders comprises: a crank angle detection device for detecting the crank angle of the four cycle engine; a first computation device for computing the quantity of fuel, which is injected in a predetermined stroke of a four…
The invention relates to a method and device for determining the instantaneous mass flow of a gas, such as air in a conduit (12), like an air intake channel of an internal combustion engine of a motor vehicle. The method comprises the steps of: - measuring (81) a time-domain signal of gas pressure…
The invention relates to a method for estimating the volumetric efficiency of an engine as a function of the temperature of air in the intake manifold and cooling fluid, with characterization of an efficiency for each of the nine pairs obtained from the maximum, nominal and minimum temperatures of…
Provided is a system and method for calculating intake air parameters with high accuracy for an internal combustion engine that is provided with an intake air throttle. The system (1) for calculating intake air parameters includes an ECU (2). The ECU (2) calculates an error (KTHERRCOR) by an error…
A time-course change dM/dt in the mass M of air in an intake passage downstream of a throttle value is estimated through application of a mass conservation law to the air in the passage (Expression (14) and Step 715). A time-course change dTm/dt in the temperature (intake air temperature) Tm of the…
A cylinder intake air amount calculating apparatus for an internal combustion engine for calculating a cylinder intake air amount which is an amount of fresh air sucked into a cylinder of the engine, is provided. An intake air flow rate, which is a flow rate of fresh air passing through an intake…
Disclosed is an atmospheric pressure estimation device that estimates the atmospheric pressure to be applied to the calculation of control parameters for internal combustion engines. An estimated airflow passing an intake throttle valve is calculated based on the estimated atmospheric pressure…
The device (4) has an air guiding channel (14) passing into a measuring cross-sectional surface (7) via an outlet cross-sectional surface (13) of a flow guiding element (11), where geometry of the outlet cross-sectional surface corresponds to geometry of the measuring cross-sectional surface…
A failure determination device for an air weight flow rate detector that maintains the calculation accuracy for an estimated air weight flow rate value to be compared with a detection value from the air weight flow rate detector, thereby allowing the failure determination accuracy to be improved. A…
To provide an internal combustion engine control apparatus which is capable of obtaining an accurate air flow rate by using a thermal air flow rate detecting apparatus (2) at the time when pulsation is caused. The internal combustion engine control apparatus according to the present invention is…
An intake manifold (34) of an engine (14) has a common pipe (38) disposed downstream of a throttle valve (42), a plurality of first through fourth branch pipes (36a through 36d) connected to the common pipe (38), and a bypass pipe (60) connected between the common pipe (38) and the first through…
A control system of an internal combustion engine provided with a throttle valve passage air flow calculation equation by which the throttle valve passage air flow mt is expressed as a function of the downstream side intake pipe pressure at the downstream side of the throttle valve and a cylinder…
An air quantity estimation apparatus for an internal combustion engine estimates intake pipe section pressure, which is pressure of air within an intake pipe section. When throttle valve opening is smaller than a threshold value, the apparatus estimates the intake pipe section pressure by use of an…
An amount-of-air detecting time period Ti is preset based on an intake time period Tr during which intake air is actually drawn into a cylinder chamber. An intake air amount average value Qa during a time period, other than the time period Ti, between intake strokes is calculated. After…
In a device for estimating an amount of intake air of an internal combustion engine, wherein an amount of intake air passing through the throttle valve is calculated by using of an upstream side intake air pressure upstream of the throttle valve and a downstream side intake air pressure downstream…
An air intake apparatus for an internal combustion engine includes an air intake manifold (6) that has a plurality of branch pipes (7) that are connected to an internal combustion engine and has a collecting pipe (8) to which a throttle body (10) is connected, in which an air intake quantity that…
Calculation models (22, 24) for an in-cylinder air charge amount determine an estimated intake air pressure (Pe) based on an intake air flow rate (Ms), and then determine an air charge amount (Mc) from the estimated intake air pressure (Pe). A correction execution module (26) corrects, while a…
An intake parameter estimating device is provided for estimating a tuning frequency (NEK) of an internal combustion engine, which in turn can be used to estimate an intake air pressure of the internal combustion engine. The intake parameter estimating device basically has a fundamental frequency…
The invention relates to an intake-air measuring apparatus for an internal combustion engine, enabling to calculate a mass of intake-air inducted into the internal combustion engine, with a small map but at high accuracy, comprises: a means (11) for measuring out an air mass passing through a…
A signal conditioning device (1), in particular for probes (3) for measuring air flow rate in internal combustion engines, comprising means (2) for translating and/or amplifying a signal outputted by the measuring probe (3), before it reaches a unit (4) for controlling and managing the engine. A…
To provide a method of processing intake air pressure signals for accurately detecting the engine load including the accelerating state and the intake air flow rate from the intake air pressure. Intake air pressure signals detected with an intake air pressure sensor 15 are processed with a low-pass…
Intake pressures PMi ÄmmHgÜ are detected at each crank angle position of 30 DEG Ä DEG CA (Crank Angle)Ü after an internal combustion engine 1 is started, and the intake pressures PMi are smoothed according to transition conditions thereof so as to be obtained as an atmospheric pressure. As this…
The invention relates to a method for estimation of air charge of an engine comprising at least one cylinder (1), an air inlet (3) and an intake manifold (8), said method comprising: measuring the air flow via said air inlet (3), and measuring the pressure in said intake manifold (8). The method…
A correction unit corrects a previously computed amount of air passing through a throttle valve (6) based on a pressure differential between the atmospheric pressure and the previously computed intake pipe pressure when the intake pipe pressure is replaced by the atmospheric pressure. An intake…
The air intake flow rate fed into the cylinder is corrected to a rate required for estimating an actual air intake flow based on the amount of change in the rate fed into the cylinder at pre-determined timings. A variance in the air intake flow rate caused by the change in the intake pressure at…