Method and apparatus for furnishing a filtered air system state variable in a control unit of an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10018532-B2
Application number	US-201514962564-A
Country	US
Kind code	B2
Filing date	Dec 8, 2015
Priority date	Dec 8, 2014
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A method is provided for identifying an averaged sensor value of a state variable of an air system for an internal combustion engine in a motor vehicle, comprising the following steps:
acquiring and temporarily storing sensor values at a predefined sampling interval during a segment duration of the state variable, the segment duration corresponding to one period of a pulsation of the state variable; determining an average of the sensor values acquired within the segment duration; correcting the average of the sensor values that has been determined, using a correction variable that depends on the time difference between the segment duration and a multiple of the sampling interval.

First claim

What is claimed is:

1. A method for identifying an averaged sensor value of a state variable of an air system for an internal combustion engine in a motor vehicle, the method comprising:
acquiring and temporarily storing, via a processor, sensor values at a predefined sampling interval during at least one segment duration of the state variable, the segment duration corresponding to one period of a pulsation of the state variable;
determining, via the processor, an average of the sensor values acquired within the at least one segment duration;
correcting, via the processor, the average of the sensor values that has been determined, using a correction variable that depends on a time difference between the at least one segment duration and a multiple of the sampling interval, so as to provide filtered sensor values; and
providing the filtered sensor values to an engine control unit to control the engine so as to provide a desired torque;
wherein the state variable corresponds to one of a gas mass flow and a pressure in the air system of the internal combustion engine.

2. The method as recited in claim 1 , further comprising:
identifying the segment duration of a current segment as a function of a current rotation speed of the internal combustion engine.

3. The method as recited in claim 1 , further comprising:
identifying a correction value as a function of a measured value which is found immediately before a starting point in time that is obtained from an ending point in time, at which, after an end of the segment duration, a sensor value is to be acquired, minus the segment duration.

4. The method as recited in claim 3 , wherein the correction value is identified as a function of a correction time duration that is obtained from a time difference between the segment duration and a time duration that is determined by a product of the sampling interval and a number of sensor values acquired between the starting point in time and the ending point in time.

5. The method as recited in claim 1 , wherein the determining and the correcting are carried out when an end of the segment duration is reached, the segment duration being predefined by a predetermined crankshaft angle of a crankshaft of the internal combustion engine.

6. An apparatus for identifying an averaged sensor value of a state variable of an air system for an internal combustion engine in a motor vehicle, comprising:
an acquiring device to acquire and temporarily store sensor values at a predefined sampling interval during at least one segment duration of the state variable, the segment duration corresponding to one period of a pulsation of the state variable;
a determining device to determine an average of the sensor values acquired within the at least one segment duration; and
a correcting device to correct the average of the sensor values that has been determined, using a correction variable that depends on a time difference between the at least one segment duration and a multiple of the sampling interval, so as to provide filtered sensor values;
wherein the filtered sensor values are provided to an engine control unit to control the engine so as to provide a desired torque, and
wherein the state variable corresponds to one of a gas mass flow and a pressure in the air system of the internal combustion engine.

7. The apparatus as recited in claim 6 , wherein the apparatus includes an engine control unit.

8. A non-transitory computer readable medium having a computer program, which is executable by a processor, comprising:
a program code arrangement having program code for identifying an averaged sensor value of a state variable of an air system for an internal combustion engine in a motor vehicle, by performing the following:
acquiring and temporarily storing, via the processor, sensor values at a predefined sampling interval during at least one segment duration of the state variable, the segment duration corresponding to one period of a pulsation of the state variable;
determining, via the processor, an average of the sensor values acquired within the at least one segment duration; and
correcting, via the processor, the average of the sensor values that has been determined, using a correction variable that depends on a time difference between the at least one segment duration and a multiple of the sampling interval, so as to provide filtered sensor values; and
providing the filtered sensor values to an engine control unit to control the engine so as to provide a desired torque;
wherein the state variable corresponds to one of a gas mass flow and a pressure in the air system of the internal combustion engine.

9. The computer readable medium of claim 8 , further comprising:
identifying the segment duration of a current segment as a function of a current rotation speed of the internal combustion engine.

Assignees

• Bosch Gmbh Robert

Inventors

• Jadhav Pandurang
• Farr Thomas
• Kuhn Daniel

Classifications

• G01L19/02

  Arrangements for preventing, or for compensating for, effects of inclination or acceleration of the measuring device; Zero-setting means (for aneroid barometers G01L7/14) · CPC title

• G01M15/09 Primary

  by monitoring pressure in fluid ducts, e.g. in lubrication or cooling parts · CPC title

• G01M15/042

  by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 · CPC title

• G01L27/002

  Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination · CPC title

• G01F15/00

  Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus · CPC title