Power plants – Internal combustion engine with treatment or handling of... – Divider – collector – valve means – or boundary layer device...
Reexamination Certificate
2000-12-18
2004-02-24
Tran, Binh (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Divider, collector, valve means, or boundary layer device...
C060S274000, C060S287000, C060S291000, C060S317000, C073S118040, C073S023310, C073S023320, C073S863320, C073S863410
Reexamination Certificate
active
06694728
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an exhaust gas dilution apparatus used for measuring particulate emissions discharged from diesel engines and the like.
2. Description of the Background Art
A mini-tunnel system is given as a conventional exhaust gas dilution apparatus. According to this system, part of the exhaust gas from a diesel engine, for example, is removed and mixed with air in a dilution tunnel to produce and measure particulate emissions. It is important for this type of dilution apparatus to constantly segregate a certain proportion of the exhaust gas and to introduce such segregated gas into the dilution tunnel. An axisymmetric flow division system (Japanese Patent Application Laid-open No. 9-325102, etc.) has been proposed for this purpose.
FIG. 10
is a schematic drawing showing an example of a conventional exhaust gas dilution apparatus of this axisymmetric flow division system. This exhaust gas dilution apparatus
100
has a rectifier
101
, a divider
102
, a surge tank
104
, a dilution tunnel
105
, and the like.
The rectifier
101
adjusts the flow of exhaust gas from the engine exhaust pipe and introduces the gas into the divider
102
.
The divider
102
divides the introduced exhaust gas into a plurality of flows by means of divider pipes
103
and extracts part of the gas to outside. This divider
102
is provided with a plurality of divider pipes
103
having the same length and diameter. Exhaust gas introduced into the divider
102
is divided by flowing into these divider pipes
103
. A surge tank
104
is an exhaust chamber installed at the end of the divider
102
to recombine the gas flows divided by the divider
102
and discharge the combined gas.
An introduction pipe (a divider pipe on the dilution tunnel side)
103
t
is one of the divider pipes
103
, which is folded outwardly from the divider
102
and extends to the dilution tunnel
105
. Gas flowing into the introduction pipe
103
t
is led to, and discharged into the dilution tunnel
105
. The dilution tunnel
105
is an air duct for diluting the exhaust gas introduced by the introduction pipe
103
t.
Because this system can divide the exhaust gas in a specified ratio according to the physical form of the divider
102
, this type of exhaust gas dilution apparatus can divide gas more accurately than other conventional method such as a twin venturi type or multi-pipe type.
The aforementioned exhaust gas dilution apparatus shown in
FIG. 10
, however, cannot accurately divide the exhaust gas when the pressure Pc in the surge tank (exhaust chamber)
104
and the pressure Pt in the dilution tunnel
105
are not equivalent.
An object of the present invention is to overcome the above problems and to provide an exhaust gas dilution apparatus which can accurately divide the exhaust gas.
SUMMARY OF THE INVENTION
In order to attain the above object, a first invention provides an exhaust gas dilution apparatus equipped with a divider which divides exhaust gas introduced therein into a plurality of flows, extracts a portion of the gas to a dilution tunnel, and discharges the remaining portion to an exhaust chamber, wherein the exhaust gas dilution apparatus is characterized by comprising a first pressure detection means to detect the pressure in the dilution tunnel, a second pressure detection means to detect the pressure in the exhaust chamber, an exhaust adjustment means to adjust the exhaust gas in the exhaust chamber, and a control means to control the exhaust adjustment means so that the output of the first pressure detection means and the output of the second pressure detection means may become equivalent.
A second invention comprises an exhaust gas dilution apparatus equipped with a first divider which divides exhaust gas introduced therein into a plurality of flows and has a first divider pipe for extracting a portion of the gas into a dilution tunnel and a second divider pipe to discharge the remaining portion to an exhaust chamber, wherein the exhaust gas dilution apparatus is characterized by comprising a first and second flow rate measuring means having equivalent performance, provided in an equivalent position respectively in the first and second divider pipes, an exhaust adjustment means for adjusting exhaust from the exhaust chamber, and a control means to control the exhaust adjustment means so that the flow rate on the dilution tunnel side measured by the first flow rate measuring means and the flow rate on the exhaust pipe side measured by the second flow rate measuring means may become equivalent.
A third invention is the exhaust gas dilution apparatus having the same constitution as the exhaust gas dilution apparatus of the second invention, provided that the second flow rate measuring means comprises a plurality of venturis, one provided in each of the second dividers, a plurality of pressure difference detectors for measuring the pressure difference between the high pressure side and the low pressure side of each venturi, and an averaging circuit which averages the electric signals detected by the pressure difference detectors.
A fourth invention is an exhaust gas dilution apparatus having the same constitution as that of the second invention, provided that the second flow rate measuring means comprises a plurality of venturis for measurement, provided in representative dividers selected from the plurality of second dividers, and dummy venturis which are provided in the plurality of second dividers, excluding the dividers for which the venturis for measurement are provided, and have a throttle with the same configuration as that provided in the venturis for measurement.
A fifth invention is an exhaust gas dilution apparatus having the same constitution as that of the second invention, provided that the second flow rate measuring means comprises a plurality of venturis, one provided in each of the second dividers, and one pressure difference detector for measuring the pressure difference between the high pressure side and the low pressure side in combined pressure introduction pipes on the high pressure side and the low pressure side, which are formed by respectively combining the pressure introduction pipes of the venturis on the high pressure side and on the low pressure side.
A sixth invention provides an exhaust gas dilution apparatus equipped with a divider which divides exhaust gas introduced therein into a plurality of flows and has a first divider pipe for extracting a portion of the gas into a dilution tunnel and a second divider pipe for exhausting the remaining portion into an exhaust chamber, wherein the exhaust gas dilution apparatus is characterized by comprising first and second fluid throttling means having equivalent performance, provided in an equivalent position respectively in the first and second divider pipes, a high pressure side pressure difference detection means for detecting the pressure difference between the high pressure side of the first fluid throttling means and the high pressure side of the second fluid throttling means, a low pressure side pressure difference detection means for detecting the pressure difference between the low pressure side of the first fluid throttling means and the low pressure side of the second fluid throttling means, an exhaust adjustment means to adjust exhaust from the exhaust chamber, and a control means to control the exhaust adjustment means so that the pressure difference values detected by the low pressure side pressure difference detection means and the high pressure side pressure difference detection means may become equivalent and zero.
A seventh invention is an exhaust gas dilution apparatus having the same constitution as that of the sixth invention, provided that the high pressure side pressure difference detection means and the low pressure side pressure difference detection means are equipped with a cylinder, a free piston slidably inserted into the cylinder, and a piston position detecting means which detects the position of the free piston.
An eighth inv
Fukushima Susumu
Ikeda Tadashi
Sekiya Mitsunobu
Yoshimura Yoshihiro
Ono Sokki Co., Ltd.
Tran Binh
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