US6574956B1 — Apparatus and method for interrupting regeneratio…

Claim 1

Independent Claim 195 words

A method for interrupting regeneration of a particulate filter in an exhaust gas system of an internal combustion engine with an mass air flow rate (MAF) to the engine and an intake manifold absolute pressure (MAP) being detected by sensors and being varied by operating an intake throttle valve disposed in an inlet of the engine and an exhaust gas recirculation valve disposed in an exhaust gas recirculation system coupled to an exhaust of the engine and an intake of the engine, comprising the steps of actuating the exhaust gas recirculation valve to maintain a predetermined air mass flow rate (MAF des ); and actuating the intake throttle valve to maintain a predetermined intake manifold absolute pressure (MAP mod ) wherein said predetermined intake manifold absolute pressure (MAP mod ) is based on a pressure correction (Δ) and a desired intake manifold absolute pressure (MAP des ), said pressure correction (Δ) depends on a difference between said predetermined mass air flow rate (MAF des ) and a measured mass air flow rate (MAF mes ), said measured mass air flow rate (MAF mes ) is based on an output of the mass air flow sensor.

Claim 2

Independent Claim 195 words

A method for interrupting regeneration of a particulate filter in an exhaust gas system of an internal combustion engine with an mass air flow rate (MAF) to the engine and an intake manifold absolute pressure (MAP) being detected by sensors and being varied by operating an intake throttle valve disposed in an inlet of the engine and an exhaust gas recirculation valve disposed in an exhaust gas recirculation system coupled to an exhaust of the engine and an intake of the engine, comprising the steps of actuating the exhaust gas recirculation valve to maintain a predetermined air mass flow rate (MAF des ); and actuating the intake throttle valve to maintain a predetermined intake manifold absolute pressure (MAP mod ) wherein said predetermined intake manifold absolute pressure (MAP mod ) is based on a pressure correction (Δ) and a desired intake manifold absolute pressure (MAP des ), said pressure correction (Δ) depends on a difference between said predetermined mass air flow rate (MAF des ) and a measured mass air flow rate (MAF mes ), said measured mass air flow rate (MAF mes ) is based on an output of the mass air flow sensor.

Claim 3

Dependent Claim 34 words

The method of claim 1 , further comprising the steps of determining a temperature in the particulate filter; and interrupting regeneration of the particulate filter when said particulate filter temperature exceeds a predetermined temperature.

Claim 4

Dependent Claim 42 words

The method of claim 1 wherein said predetermined mass air flow rate (MAF des ) is calculated as a function of an engine speed (n), a fuel supply (F q ) to the engine, and a desired air/fuel ratio (AF des ).

Claim 5

Dependent Claim 39 words

The method of claim 1 wherein said actuation of the exhaust gas recirculation valve is based on a difference between said predetermined mass air flow rate (MAF des ) and said measured mass air flow rate (MAF mes ).

Claim 6

Dependent Claim 20 words

The method of claim 4 wherein said actuation of the exhaust gas recirculation valve is controlled closed-loop with integral control.

Claim 7

Dependent Claim 59 words

The method of claim 1 , said actuation of the intake throttle valve is based on a difference between said predetermined intake manifold absolute pressure (MAP mod ) and a measured intake manifold absolute pressure (MAP mes ), said measured intake manifold absolute pressure (MAP mes ) is based on an output of the intake manifold absolute pressure sensor.

Claim 8

Dependent Claim 19 words

The method of claim 6 , said actuation of the intake throttle valve is controlled closed-loop with integral control.

Claim 9

Dependent Claim 46 words

The method of claim 1 , said pressure correction (Δ) is based on a time integral of a monotonically rising, preferably nonlinear, function of a difference between said predetermined mass air flow rate (MAF des ) and said measured mass air flow rate (MAF mes ).

Claim 10

Dependent Claim 33 words

The method of claim 8 wherein said monotonically rising function is multiplied by a factor proportional to the extent of opening of the exhaust gas recirculation valve prior to performing said time integral.

Claim 11

Dependent Claim 42 words

The method of claim 1 , said pressure correction (Δ) is based on a time integral of a monotonically decreasing function, said function decreases to zero, and on a factor proportional to the extent of opening of the exhaust gas recirculation valve.

Claim 12

Independent Claim 209 words

An apparatus for interrupting regeneration of a particulate filter in an exhaust gas system of a diesel engine, the engine having an mass air flow sensor, an intake manifold absolute pressure sensor, and an intake throttle valve disposed in the intake of the engine, the engine having an exhaust gas recirculation valve in an exhaust gas recirculation system coupled between an engine exhaust and the engine intake, comprising: a mass air flow rate controller coupled to the exhaust gas recirculation valve which actuates the exhaust gas recirculation valve to maintain a predetermined mass air flow rate (MAF des ) to the engine; an intake manifold absolute pressure controller coupled to the intake throttle valve which actuates the intake throttle valve to maintain a predetermined intake manifold absolute pressure (MAP mod ); and a coordination module which calculates said predetermined intake manifold absolute pressure (MAP mod ) based on the sum of a pressure correction (Δ) and a desired intake manifold absolute pressure (MAP des ), said pressure correction depends on a difference between said predetermined mass air flow rate (MAF des ) and a measured mass air flow rate (MAF mes ), said measured mass air flow rate is based on an output of the mass air flow sensor.

Claim 13

Independent Claim 209 words

An apparatus for interrupting regeneration of a particulate filter in an exhaust gas system of a diesel engine, the engine having an mass air flow sensor, an intake manifold absolute pressure sensor, and an intake throttle valve disposed in the intake of the engine, the engine having an exhaust gas recirculation valve in an exhaust gas recirculation system coupled between an engine exhaust and the engine intake, comprising: a mass air flow rate controller coupled to the exhaust gas recirculation valve which actuates the exhaust gas recirculation valve to maintain a predetermined mass air flow rate (MAF des ) to the engine; an intake manifold absolute pressure controller coupled to the intake throttle valve which actuates the intake throttle valve to maintain a predetermined intake manifold absolute pressure (MAP mod ); and a coordination module which calculates said predetermined intake manifold absolute pressure (MAP mod ) based on the sum of a pressure correction (Δ) and a desired intake manifold absolute pressure (MAP des ), said pressure correction depends on a difference between said predetermined mass air flow rate (MAF des ) and a measured mass air flow rate (MAF mes ), said measured mass air flow rate is based on an output of the mass air flow sensor.

Claim 14

Dependent Claim 44 words

The apparatus of claim 11 wherein said mass air flow rate controller determines a desired exhaust gas recirculation valve position based on a difference between said predetermined mass air flow rate (MAF des ) and said measured mass air flow rate (MAF mes ).

Claim 15

Dependent Claim 63 words

The apparatus of claim 11 wherein said intake manifold absolute pressure control controller determines a desired intake throttle valve position based on a difference between said predetermined intake manifold absolute pressure (MAP mod ) and said measured intake manifold pressure (MAP mes ), said measured intake manifold pressure (MAP mes ) is based on an output of the intake manifold absolute pressure sensor.

Claim 16

Dependent Claim 70 words

The apparatus of claim 11 wherein said pressure correction (Δ) is based on a time integral of a monotonically rising function of a difference between said predetermined mass air flow rate (MAP des ) and said measured mass air flow rate (MAF mes ) and on a time integral of a monotonically decreasing function and on a factor proportional to the extent of opening of the exhaust gas recirculation valve.

Claim 17

Dependent Claim 40 words

The apparatus of claim 11 further comprising a temperature estimating module for estimating the temperature in the particulate filter wherein regeneration of the particulate filter is interrupted when said estimated temperature in the particulate filter exceeds a predetermined temperature threshold.

Claim 18

Dependent Claim 42 words

The apparatus of claim 11 wherein said predetermined mass air flow rate (MAF des ) is calculated as a function of an engine speed (n), a fuel supply (F q ) to the engine, and a desired air/fuel ratio (AF des ).

Claim 19

Dependent Claim 31 words

The apparatus of claim 11 wherein said predetermined mass air flow rate (MAF des ) is calculated as a function of an amount of flow through said exhaust gas recirculation valve.

Claim 20

Dependent Claim 228 words

A computer readable storage medium having stored data representing instructions executable by a computer to actuate an intake throttle valve and an exhaust gas recirculation valve of an internal combustion engine to interrupt regeneration of a particulate filter disposed in an exhaust coupled to the engine, the intake throttle valve, an intake manifold absolute pressure sensor, and a mass air flow sensor are disposed in an intake coupled to the engine, the exhaust gas recirculation valve is disposed in an exhaust gas recirculation system coupled between the engine intake and the engine exhaust, comprising: instructions to actuate the intake throttle valve to create a predetermined intake manifold absolute pressure (MAP mod ) in the engine intake; instructions to actuate the exhaust gas recirculation valve to create a desired mass air flow (MAF des ); and instructions to coordinate the actuation of the intake throttle valve and the exhaust gas recirculation valve by basing said predetermined intake manifold absolute pressure (MAP mod ) on the sum of a pressure correction (Δ) and a desired intake manifold absolute pressure (MAP des ), said pressure correction (Δ) depends on a difference between said predetermined mass air flow rate (MAF des ) and a measured mass air flow rate (MAF mes ) said measured mass air flow rate (MAF mes ) is based on an output of the mass air flow sensor.

Claim 21

Dependent Claim 228 words

A computer readable storage medium having stored data representing instructions executable by a computer to actuate an intake throttle valve and an exhaust gas recirculation valve of an internal combustion engine to interrupt regeneration of a particulate filter disposed in an exhaust coupled to the engine, the intake throttle valve, an intake manifold absolute pressure sensor, and a mass air flow sensor are disposed in an intake coupled to the engine, the exhaust gas recirculation valve is disposed in an exhaust gas recirculation system coupled between the engine intake and the engine exhaust, comprising: instructions to actuate the intake throttle valve to create a predetermined intake manifold absolute pressure (MAP mod ) in the engine intake; instructions to actuate the exhaust gas recirculation valve to create a desired mass air flow (MAF des ); and instructions to coordinate the actuation of the intake throttle valve and the exhaust gas recirculation valve by basing said predetermined intake manifold absolute pressure (MAP mod ) on the sum of a pressure correction (Δ) and a desired intake manifold absolute pressure (MAP des ), said pressure correction (Δ) depends on a difference between said predetermined mass air flow rate (MAF des ) and a measured mass air flow rate (MAF mes ) said measured mass air flow rate (MAF mes ) is based on an output of the mass air flow sensor.

Claim 22

Dependent Claim 47 words

The computer readable storage medium of claim 18 , further comprising instructions to determine said predetermined intake manifold absolute pressure (MAP mod ) based on a difference between said predetermined mass air flow rate (MAF des ) and said measured mass air flow rate (MAF mes ).

Claim 23

Dependent Claim 45 words

The computer readable storage medium of claim 18 , further comprising instructions to determine a desired exhaust gas recirculation valve position based on a difference between said predetermined mass air flow rate (MAF des ) and said measured mass air flow rate (MAF mes ).

Claim 24

Dependent Claim 48 words

The computer readable storage medium of claim 18 , further comprising instructions to determine said predetermined mass air flow rate (MAF des ) as a function of an engine speed (n), a fuel supply (F q ) to the engine, and a desired air/fuel ratio (AF des ).

Claim 25

Dependent Claim 56 words

The computer readable storage medium of claim 18 wherein a sensor to detect position is coupled to the exhaust gas recirculation, further comprising instructions to determine said pressure correction based on an output of said position sensor, said predetermined mass air flow rate (MAF des ), and said measured mass air flow rate (MAF mes ).

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2006-06-09	2006-12-09	2007-06-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2010-06-09	2010-12-09	2011-06-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2014-06-09	2014-12-09	2015-06-10	$7700.00	Window Closed / Lapsed

Apparatus and method for interrupting regeneration of a particulate filter in a diesel engine

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag