Real-time residual mass estimation with adaptive scaling

Patent metadata

Field	Value
Publication number	US-9708991-B2
Application number	US-201414185673-A
Country	US
Kind code	B2
Filing date	Feb 20, 2014
Priority date	Feb 20, 2013
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

Systems and methods are described for on-line, real-time estimation of a residual mass in an engine cylinder during HCCI combustion. The residual mass is estimated based on an estimated residual mass for a previous combustion cycle. A value of a first performance variable for the first combustion cycle is determined based only on engine data measured by one or more sensors. A value of a second performance is estimated based at least in part on the estimated residual mass for the first combustion cycle. An adaptive scaling factor is determining for the first combustion cycle based on the determined value of the first performance variable and the estimated value of the second performance variable. An adjusted residual mass for the first combustion cycle is then determined based on the estimated residual mass for the first combustion cycle and the adaptive scaling factor for the first combustion cycle.

First claim

What is claimed is:

1. A method of estimating a residual mass in a cylinder after a combustion cycle, the method comprising:
determining an estimated residual mass for a first combustion cycle based on an estimated residual mass for a previous combustion cycle;
determining a value of a first performance variable for the first combustion cycle based only on engine data measured by one or more sensors;
estimating a value of a second performance variable for the first combustion cycle based at least in part on the estimated residual mass for the first combustion cycle;
determining an adaptive scaling factor for the first combustion cycle based on the determined value of the first performance variable for the first combustion cycle and the estimated value of the second performance variable for the first combustion cycle; and
determining an adjusted residual mass for the first combustion cycle based on the estimated residual mass for the first combustion cycle and the adaptive scaling factor for the first combustion cycle.

2. The method of claim 1 , wherein the first performance variable and the second performance variable are a single performance variable such that the value of the first performance variable is a determined value of the single performance variable based only on the engine data measured by one or more sensors and the value of the second performance variable is an estimated value of the single performance variable based at least in part on the estimated residual mass for the first combustion cycle.

3. The method of claim 2 , wherein a difference between the value of the first performance variable and the value of the second performance variable is indicative of an error in the estimated residual mass, and wherein the adaptive scaling factor is determined based on the difference between the value of the first performance variable and the value of the second performance variable such that the adaptive scaling factor corrects the error in the estimated residual mass.

4. The method of claim 1 , further comprising:
determining an estimated residual mass for a second combustion cycle based on the estimated residual mass for the first combustion cycle;
determining a value of the first performance variable for the second combustion cycle based only on engine data measured by the one or more sensors;
estimating a value of the second performance variable for the second combustion cycle based at least in part on the estimated residual mass for the second combustion cycle;
determining an adaptive scaling factor for the second combustion cycle based on the determined value of the first performance variable for the second combustion cycle and the estimated value of the second performance variable for the second combustion cycle; and
determining an adjusted residual mass for the second combustion cycle based on the estimated residual mass for the second combustion cycle and the adaptive scaling factor for the second combustion cycle.

5. The method of claim 4 , wherein the act of determining the adaptive scaling factor for the second combustion cycle further includes determining the adaptive scaling factor for the second combustion cycle based on the value of the first performance variable for the first combustion cycle and the value of the second performance variable for the first combustion cycle.

6. The method of claim 4 , wherein the act of determining the adaptive scaling factor for the second combustion cycle further includes determining the adaptive scaling factor for the second combustion cycle based on the estimated residual mass for the second combustion cycle and the estimated residual mass for the first combustion cycle.

7. The method of claim 4 , wherein the act of determining the adaptive scaling factor for the second combustion cycle includes determining the adaptive scaling factor according to the equation:

C
e

⁡

(
n
)

=

(

∑

i
=
1

n

⁢

ϕ
⁡

(
i
)

⁢

λ

(

n
-
i

)

⁢

ϕ
⁡

(
i
)

T

)

-
1

⁢

(

∑

i
=
1

n

⁢

ϕ
⁡

(
i
)

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λ

(

n
-
1

)

⁢

z
⁡

(
i
)

)

wherein n is an index for the second combustion cycle, n−1 is an index for the first combustion cycle, C e (n) is the adaptive scaling factor for the second combustion cycle, φ(i) is a value indicative of the estimated residual mass for combustion cycle i, z(i) is a value indicative of the value of the first performance variable and the second performance variable for combustion cycle i, and λ is a tuning parameter whose value affects a weight given to previous combustion cycles in calculating the adaptive scaling factor for the second combustion cycle.

8. The method of claim 7 , wherein the firs

Assignees

• Bosch Gmbh Robert
• Univ Michigan Regents

Inventors

• Larimore Jacob
• Jiang Li
• Hellstrom Erik
• Jade Shyam
• Stefanopoulou Anna
• Vanier Julien

Classifications

• G01M15/042

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

• F02D41/0062 Primary

  Estimating, calculating or determining the internal EGR rate, amount or flow · CPC title

• F02D35/028

  by determining the combustion timing or phasing · CPC title

• Y02T10/128

  Cross-Sectional Technologies · mapped topic

• Y02T10/47

  Cross-Sectional Technologies · mapped topic