Cylinder identifying system for internal combustion engine
First Claim
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1. A cylinder identifying system for an internal combustion engine, comprising:
- crank angle signal detecting means for generating a crank angle pulse signal composed of pulse trains each containing a reference position in synchronism with rotation of a crank shaft of said internal combustion engine;
a cam shaft rotating at a speed corresponding to one half of that of said crank shaft;
cam signal detecting means for generating a cam pulse signal including specific pulses identifying individual cylinders, respectively, of said internal combustion engine in synchronism with rotation of said cam shaft; and
cylinder identifying means for identifying said individual cylinders, respectively, of said internal combustion engine on the basis of said crank angle pulse signal and said cam pulse signal, wherein said cylinder identifying means includes;
pulse signal number storage means for dividing an ignition control period for each of said individual cylinders into a plurality of subperiods for thereby counting for storage signal numbers of said specific pulses generated during said plurality of subperiods, respectively; and
subperiod discriminating means for determining discriminatively a sequential order of said plural subperiods on the basis of combinations of the signal numbers of said specific pulses generated during said plural subperiods, respectively, wherein said combinations of the signal numbers of said specific pulses generated during said plural subperiods differ from one to another correspondingly to said plural subperiods in dependence on start points of said plural subperiods, respectively, and wherein said cylinder identifying means is so designed as to identify said individual cylinders on the basis of results of said discriminative determination of said subperiods performed by said subperiod discriminating means independently of the start points of said plural subperiods.
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Abstract
A cylinder identifying system for an internal combustion engine enables fuel injection and ignition controls for individual cylinders to be speedily performed upon starting of engine. A cylinder identifying means (10) operating on the basis of a crank angle signal (SGT) and a cam signal (SGC) includes a pulse signal number storage means (12) for dividing an ignition control period of each cylinder into plural subperiods for counting for storage signal numbers of specific pulses generated over plural subperiods, and a subperiod discriminating means (14) for determining discriminatively a sequential order of the plural subperiods on the basis of combinations of the numbers of the specific pulses generated during the plural subperiods. The combinations of the numbers of specific pulses generated during the plural subperiods differ one another correspondingly to the plural subperiods independently from the start points thereof. The cylinder identifying means (10) identifies the individual cylinders on the basis of results of determination made by the subperiod discriminating means (14) independently of positional relationships between the storage start points and the subperiods.
14 Citations
9 Claims
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1. A cylinder identifying system for an internal combustion engine, comprising:
-
crank angle signal detecting means for generating a crank angle pulse signal composed of pulse trains each containing a reference position in synchronism with rotation of a crank shaft of said internal combustion engine;
a cam shaft rotating at a speed corresponding to one half of that of said crank shaft;
cam signal detecting means for generating a cam pulse signal including specific pulses identifying individual cylinders, respectively, of said internal combustion engine in synchronism with rotation of said cam shaft; and
cylinder identifying means for identifying said individual cylinders, respectively, of said internal combustion engine on the basis of said crank angle pulse signal and said cam pulse signal, wherein said cylinder identifying means includes;
pulse signal number storage means for dividing an ignition control period for each of said individual cylinders into a plurality of subperiods for thereby counting for storage signal numbers of said specific pulses generated during said plurality of subperiods, respectively; and
subperiod discriminating means for determining discriminatively a sequential order of said plural subperiods on the basis of combinations of the signal numbers of said specific pulses generated during said plural subperiods, respectively, wherein said combinations of the signal numbers of said specific pulses generated during said plural subperiods differ from one to another correspondingly to said plural subperiods in dependence on start points of said plural subperiods, respectively, and wherein said cylinder identifying means is so designed as to identify said individual cylinders on the basis of results of said discriminative determination of said subperiods performed by said subperiod discriminating means independently of the start points of said plural subperiods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
wherein said pulse signal number storage means is so designed as to count for storage the numbers of pulses of said cam pulse signal and said crank angle pulse signal, respectively, from the start of operation of said internal combustion engine, wherein said cylinder identifying means includes: pulse signal sequential order storage means for storing therein temporal relations between said pulse trains of said crank angle pulse signal and said specific pulses of said cam pulse signal; and
reference position detecting means for detecting said reference position from said crank angle pulse signal, wherein when it is decided that said crank angle pulse signal has been detected since a start point of a preceding one of said plural subperiods at the latest on the basis of the number of pulses of said crank angle pulse signal which have been stored up to said reference position, said cylinder identifying means identifies said individual cylinders on the basis of the signal number of said cam pulse signal(s) generated during said preceding subperiod.
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3. A cylinder identifying system for an internal combustion engine according to claim 2,
wherein when decision is made after detection of said reference position that said crank angle pulse signal has been detected since the start point of a current one of said plural subperiods at the latest on the basis of the pulse number of said crank angle pulse signal stored up to a time point at which an end point of said current subperiod including said reference position is detected, said cylinder identifying means identifies the individual cylinders on the basis of the signal number of said cam pulse signal(s) generated during said current subperiod. -
4. A cylinder identifying system for an internal combustion engine according to claim 2,
wherein when it is decided on the basis of the pulse number of said crank angle pulse signal stored up to a subperiod end point of said plural subperiods that said crank angle pulse signal has been detected since the start point of said preceding subperiod at the latest, said cylinder identifying means identifies said individual cylinders on the basis of combination of the signal number of said cam pulse signal(s) generated during the preceding subperiod and the signal number of said cam pulse signal(s) generated during the current subperiod. -
5. A cylinder identifying system for an internal combustion engine according to claim 1,
wherein combination of signal numbers of said cam pulse signal(s) generated during said plural subperiods contains no combination of only “ - 0s”
which indicates absence of output.
- 0s”
-
6. A cylinder identifying system for an internal combustion engine according to claim 5,
wherein number of the cylinders of said internal combustion engine is four with the ignition control period for each of said cylinders being so set as to correspond to a crank angle of 180° - ,
said plural subperiods being constituted by a first subperiod and a second subperiod, and wherein numbers of said specific pulses contained in said cam pulse signal generated during said first subperiod and said second subperiod, respectively, are “
1” and
“
0”
, “
2” and
“
1”
, “
0” and
“
2” and
“
0” and
“
1”
, respectively, in the order in which said cylinders are to be controlled.
- ,
-
7. A cylinder identifying system for an internal combustion engine according to claim 6,
wherein said crank angle pulse signal is composed of pulse trains each of a period corresponding to a crank angle of 10° - , and
wherein said reference position included in said crank angle pulse signal is set at a crank angle of 35°
from a top dead center on a cylinder-by-cylinder basis.
- , and
-
8. A cylinder identifying system for an internal combustion engine according to claim 5,
wherein number of the cylinders of said internal combustion engine is six with the ignition control period for each of said cylinders being so set as to correspond to a crank angle of 120° - ,
said plural subperiods being constituted by a first subperiod and a second subperiod, and wherein numbers of said specific pulses contained in said cam pulse signal generated during said first subperiod and said second subperiod, respectively, are “
1” and
“
0”
, “
2” and
“
0”
, “
1” and
“
2”
, “
0” and
“
2”
, “
1” and
“
1” and
“
0” and
“
1”
, respectively, in the order in which said cylinders are to be controlled.
- ,
-
9. A cylinder identifying system for an internal combustion engine according to claim 5,
wherein number of the cylinders of said internal combustion engine is three with the ignition control period for each of said cylinders being so set as to correspond to a crank angle of 240° - ,
said plural subperiods being constituted by a first subperiod and a second subperiod, and wherein numbers of said specific pulses contained in said cam pulse signal generated during said first subperiod and said second subperiod, respectively, are “
1” and
“
0”
, “
2” and
“
0”
, “
1” and
“
2”
, “
0” and
“
2”
, “
1” and
“
1” and
“
0” and
“
1”
, respectively, in the order in which said cylinders are to be controlled.
- ,
Specification
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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InventorsHashimoto, Atsuko, Yonezawa, Shiro, Ohuchi, Hirofumi
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Primary Examiner(s)Vo, Hieu T.
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Application NumberUS09/846,392Publication NumberTime in Patent Office797 DaysField of Search701/102, 701/113, 701/114, 701/111, 701/115, 731/173, 123/406.62, 123/406.58, 123/406.18, 123/406.63US Class Current701/113CPC Class CodesF02D 41/009 using means for generating ...
