Internal-combustion engines – High tension ignition system – Electronic cylinder sequencing
Reexamination Certificate
2000-12-29
2002-10-01
Solis, Erick (Department: 3747)
Internal-combustion engines
High tension ignition system
Electronic cylinder sequencing
C073S117020
Reexamination Certificate
active
06457465
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Korea patent Application No. 1999-66710, filed on Dec. 30, 1999.
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a system for identifying a cylinder in an engine, and more particularly, to a system that is able to identify a cylinder in a 3-cylinder, 4-stroke engine without the use of a sensor mounted on a distributor, which is connected to a camshaft.
(b) Description of the Related Art
The identification of a cylinder in an engine is used in controlling ignition timing and is typically performed by sensors. That is, with reference to
FIG. 1
, there is mounted an internal target wheel
11
of a distributor
10
connected to a crankshaft, and a crank angle sensor
12
for detecting a crank angle and a piston position sensor
13
for detecting a top dead center of a piston are mounted to read the internal target wheel
11
. Using outputs of the sensors
12
and
13
, identification of the cylinders is possible.
In another system used to identify a cylinder of an engine, with reference to
FIG. 2
, a target wheel
21
is mounted to a crankshaft
20
and a crank angle sensor
22
for detecting a crank angle is mounted to read the target wheel
21
. Also, a target wheel
24
is mounted on a camshaft
23
and a piston position sensor
25
is mounted to read the target wheel
24
. Using outputs of the sensors
22
and
25
, identification of the cylinders is possible.
With above conventional systems for identifying cylinders in order to control ignition timing, a plurality of sensors are mounted on each crankshaft to detect a cylinder and a crank angle. Accordingly, the engine is made increasingly complex and the amount of space used by the required parts is increased. This decreases productivity and increases the overall costs of the vehicle.
SUMMARY OF THE INVENTION
The present invention has been made in an effort to solve the above problems.
It is an object of the present invention to provide a system in which engine rpm are detected according to whether or not ignition occurs according to the flow of an electric current at a TDC of a first cylinder. Further, the point of an abrupt increase in engine rpm is detected to determine a compression stroke of the first cylinder, thereby enabling the identification of the cylinders without the use of sensors.
To achieve the above object, the present invention provides a system for identifying a cylinder in an engine comprising means for applying an electric current every time a first cylinder of a 3-cylinder, 4-stroke engine is at a top dead center; means for detecting engine rpm when the current is applied; and control means for determining an exhaust stroke when the engine rpm do not increase, and for determining a compression stroke when the engine rpm abruptly increase, and sequentially providing ignition for a second cylinder and a third cylinder to operate the engine.
According to another aspect, the present invention provides a method for identifying a cylinder in an engine, comprising the steps of applying an electric current every time a first cylinder of a 3-cylinder, 4-stroke engine is at a top dead center; detecting engine rpm when the electric current is applied; and determining a type of a stroke of the engine according to the detected engine rpm.
When the engine rpm do not increase, the type of the stroke is determined as an exhaust stroke, and when the engine rpm abruptly increase, the type of the stroke is determined as a compression stroke.
When the type of the stroke is determined as a compression stroke, the method further comprises the step of sequentially providing ignition for a second cylinder and a third cylinder to operate the engine.
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patent: 5425340 (1995-06-01), Petitbon et al.
patent: 5562082 (1996-10-01), Norppa et al.
patent: 5613473 (1997-03-01), Angermaier
patent: 5756888 (1998-05-01), Marquez-Escoto
patent: 5823166 (1998-10-01), Entenmann et al.
patent: 5970784 (1999-10-01), Genin
Christie Parker & Hale LLP
Hyundai Motor Company
Solis Erick
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