Measuring and testing – Simulating operating condition – Marine
Reexamination Certificate
1999-12-03
2001-11-20
McCall, Eric S. (Department: 2855)
Measuring and testing
Simulating operating condition
Marine
Reexamination Certificate
active
06318162
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an internal combustion engine, and more particularly to a water temperature correction device and method thereof for an engine adapted to accurately control an internal combustion engine by correcting a characteristic curve of water temperature when the temperature of detected cooling water is high as compared to a reference value.
2. Description of the Prior Art
Generally, one of the most essential parameters in the control of an internal combustion engine is the temperature of cooling water. The temperature of cooling water detected by a water temperature sensor is input to a correction device according to a control signal output from the microcomputer.
Information representing the water temperature input to the correction device is used for various controls necessary for driving an internal combustion engine such as ignition time control, idle speed control, fuel injection control and the like.
FIG. 4
is an interface circuit diagram of a correction device for detecting a temperature of cooling water according to the prior art, where the information detected by the water temperature sensor passes a first resistor (R
5
) used as 5V pull-up resistor via an RC filter
24
comprising a second resistor (R
7
) and a first capacitor (C
1
) to be input to a microcomputer after being filtered, and is controlled by a previously set-up program.
At this point, the water temperature information from the water temperature sensor has a water temperature sensor characteristic curve, as illustrated in
FIG. 5
, and is stored in a memory of the correction device at a map table.
However, there is a problem in that the 5V pull-up resistor at the interface circuit for receiving the water temperature information detected by the water temperature sensor is fixed at a predetermined value, such that the detected water temperature has a wide width in water temperature change when the water temperature is high, whereas the detected voltage value is small. Thus, it is impossible to accurately control of the internal combustion engine by external influence.
SUMMARY OF THE INVENTION
Accordingly, the present invention solves the afore-mentioned problem and it is an object of the present invention to provide a water temperature correction device and method thereof for an engine, adapted to add circuitry for correction of the water temperature, to an interface circuit when a water temperature information detected and received from a water temperature sensor is higher than a predetermined reference value, thereby enabling an accurate control of an internal combustion engine regardless of external influence when the water temperature is high.
In accordance with one object of the present invention, there is provided a water temperature correction device for an engine comprising:
a water temperature sensor for detecting a temperature of cooling water in an internal combustion engine;
a microcomputer for receiving a water temperature value detected by the water temperature sensor to determine whether the received water temperature value is above a predetermined reference value, and for outputting a predetermined correction control signal when it is determined that the detected water temperature is above the predetermined reference value; and
correction means mounted within an interface circuit controlled by the predetermined correction control signal output from the microcomputer for correcting the water temperature value detected by the water temperature sensor and for supplying the corrected water temperature value to the microcomputer.
In accordance with another object of the present invention, there is provided a water temperature correction method for an engine, comprising the steps of:
receiving the water temperature value detected by the water temperature sensor to determine whether the value is higher than a predetermined set-up reference temperature;
outputting a predetermined correction control signal when it is determined that the detected water temperature value is higher than the predetermined set-up reference temperature; and
receiving the water temperature value corrected by the predetermined correction control signal to establish a voltage value stored per temperature in a map table in a memory for control thereof.
REFERENCES:
patent: 4682493 (1987-07-01), Tenenbaum
patent: 5239865 (1993-08-01), Salzer et al.
patent: 5295747 (1994-03-01), Vinci
patent: 5656771 (1997-08-01), Beswick et al.
patent: 6055470 (2000-04-01), Londot et al.
patent: 6088661 (2000-07-01), Poublon
patent: 6128948 (2000-10-01), Shi et al.
patent: 6200021 (2001-03-01), Mitsutani et al.
Birch & Stewart Kolasch & Birch, LLP
Hyundai Motor Company
McCall Eric S.
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