Method for estimating an instantaneous pressure value in a fuel line of a fuel injection system
View Patent ↗A method is provided for estimating an instantaneous pressure value P inst in a fuel line of a fuel injection system during a fuel multi-injection pattern. The method includes, but is not limited to determining a mean pressure value P inside the fuel line of the fuel injection system ( 15 ), and correcting the mean pressure value P with pressure contributions generated by the previous injections of the multi-injection pattern.
1. A method for estimating an instantaneous pressure value P inst in a fuel line of a fuel injection system during a fuel multi-injection pattern, comprising:
determining a mean pressure value P inside the fuel line of the fuel injection system; and
correcting the mean pressure value P with pressure contributions generated by the previous injections of the fuel multi-injection pattern to obtain an instantaneous pressure value P inst ; and
controlling the fuel injection system based on the instantaneous pressure value P inst .
2. The method according to claim 1 , wherein the instantaneous pressure value is estimated according to:
P
inst
=
P
_
+
K
·
∑
i
=
1
n
A
i
·
ⅇ
-
Bt
·
cos
(
2
π
·
f
i
·
t
+
φ
i
)
,
wherein the parameter K represents a proportionality factor, B a damping factor, A i represents an amplitude of the pressure wave generated by pulse Q i in the fuel multi-injection pattern, f i represents a frequency of the pressure wave generated by pulse Q i , φ i represents the phase of the pressure wave generated by pulse Q i and n the number of pulses in the fuel multi-injection pattern preceding time t.
3. The method according to claim 1 , further comprising using the instantaneous pressure value P inst to determine an injection parameter.
4. The method according to claim 3 , wherein the phase of estimation of the instantaneous pressure value P inst is performed only in case the mean pressure in the fuel line, the time interval between two consecutive pulses, an engine speed or an engine temperature are inside a respective predetermined range.
5. The method according to claim 3 , wherein the injection parameter is the time of opening of an injector in the fuel injection system.
6. The method according to claim 3 , wherein only the pressure contribution generated by the previous injection of the fuel multi-injection pattern is used for correcting the mean pressure value P inside the fuel line.
7. An internal combustion engine, comprising:
a fuel injection system; and
an electronic control unit configured to estimate an instantaneous pressure value P inst in a fuel line of the fuel injection system during a fuel multi-injection pattern, the electronic control unit configured to estimate the instantaneous pressure value P inst by:
determining a mean pressure value P inside the fuel line of the fuel injection system; and
correcting the mean pressure value P with pressure contributions generated by the previous injections of the fuel multi-injection pattern to obtain an instantaneous pressure value P inst ; and
controlling the fuel injection system based on the instantaneous pressure value P inst .
8. The internal combustion engine according to claim 7 , wherein the instantaneous pressure value is estimated according to:
P
inst
=
P
_
+
K
·
∑
i
=
1
n
A
i
·
ⅇ
-
Bt
·
cos
(
2
π
·
f
i
·
t
+
φ
i
)
,
wherein the parameter K represents a proportionality factor, B a damping factor, A i represents an amplitude of the pressure wave generated by pulse Q i in the fuel multi-injection pattern, f i represents a frequency of the pressure wave generated by pulse Q i , φ i represents the phase of the pressure wave generated by pulse Q i and the number of pulses (n) in the fuel multi-injection pattern preceding time t.
9. The internal combustion engine according to claim 7 , the electronic control unit is further configured to use the instantaneous pressure value P inst to determine an injection parameter.
10. The internal combustion engine according to claim 9 , wherein the phase of estimation of the instantaneous pressure value P inst is performed only in case the mean pressure in the fuel line, the time interval between two consecutive pulses, an engine speed or an engine temperature are inside a respective predetermined range.
11. The internal combustion engine according to claim 9 , wherein the injection parameter is the time of opening of an injector in the fuel injection system.
12. The internal combustion engine according to claim 9 , wherein only the pressure contribution generated by the previous injection of the fuel multi-injection pattern is used for correcting the mean pressure value P inside the fuel line.
13. The internal combustion engine according to claim 7 , wherein the internal combustion engine is a diesel engine.
14. A non-transitory computer readable medium embodying a computer program product, the computer program product, comprising:
an estimation program for estimating an instantaneous pressure value P inst in a fuel line of a fuel injection system during a fuel multi-injection pattern, the estimation program configured to:
determine a mean pressure value P inside the fuel line of the fuel injection system; and
correct the mean pressure value P with pressure contributions generated by the previous injections of the fuel multi-injection pattern to obtain an instantaneous pressure value P inst ; and
control the fuel injection system based on the instantaneous pressure value P inst .
15. The computer readable medium embodying the computer program product according to claim 14 ,
wherein the instantaneous pressure value is estimated according to:
P
inst
=
P
_
+
K
·
∑
i
=
1
n
A
i
·
ⅇ
-
Bt
·
cos
(
2
π
·
f
i
·
t
+
φ
i
)
,
and
wherein the parameter K represents a proportionality factor, B a damping factor, A i represents an amplitude of the pressure wave generated by pulse Q i in the fuel multi-injection pattern, f i represents a frequency of the pressure wave generated by pulse Q i , φ i represents the phase of the pressure wave generated by pulse Q i and the number of pulses (n) in the fuel multi-injection pattern preceding time t.
16. The computer readable medium embodying the computer program product according to claim 14 , further comprising using the instantaneous pressure value P inst to determine an injection parameter.
17. The computer readable medium embodying the computer program product according to claim 16 , wherein the phase of estimation of the instantaneous pressure value P inst is performed only in case the mean pressure in the fuel line, the time interval between two consecutive pulses, an engine speed or an engine temperature are inside a respective predetermined range.
18. The computer readable medium embodying the computer program product according to claim 16 , wherein the injection parameter is the time of opening of an injector in the fuel injection system.
19. The computer readable medium embodying the computer program product according to according to claim 16 , wherein only the pressure contribution generated by the previous injection of the fuel multi-injection pattern is used for correcting the mean pressure value P inside the fuel line.