Exhaust gas dilution apparatus
AssigneeOno Sokki Co., Ltd.
InventorsMitsunobu Sekiya, Susumu Fukushima, Yoshihiro Yoshimura, Tadashi Ikeda
Life of this patent
Estimating the term…
Abstract
An exhaust gas dilution apparatus 10-2 is the same form multi-venturi type comprising a rectifier 11, divider 12, exhaust chamber 14, dilution tunnel 15, and a divider pipes 13t on the dilution side of a tunnel 15 side. All divider pipes 13 are provided with a venturi 21 having the same performance inserted in the same position, to measure the flow rate in the dilution tunnel and the flow rate on the exhaust pipe side. The opening of the shutter 19 provided in the exit of the exhaust chamber 14 is controlled so that the two flow rates are equivalent.
Claims17
In 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 discharge the remaining portion to an exhaust chamber, the exhaust gas dilution apparatus 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.
In 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 to an exhaust chamber, the exhaust gas dilution apparatus characterized by comprising:
- 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.
In 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 to an exhaust chamber, the exhaust gas dilution apparatus 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.
In 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 to an exhaust chamber, the exhaust gas dilution apparatus characterized by comprising:
- first and second flow rate measuring means having equivalent performance, provided in an equivalent position respectively in the first and second divider pipes,
- a fixed volume sampling means provided downstream of the dilution tunnel to cause divided exhaust gas and dilution gas to flow at a constant rate and collect samples,
- a gas circulation means to recycle exhaust gas from the fixed volume sampling means to upstream of the divider during the time when the engine to be measured is not operating, and
- a correction means to correct the flow dividing precision of the divider based on 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.
In 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 to an exhaust chamber, the exhaust gas dilution apparatus 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,
- a fixed volume sampling means provided downstream of the dilution tunnel to cause the divided exhaust gas and dilution gas to flow at a constant rate and collect samples,
- a gas circulation means to recycle exhaust gas from the fixed volume sampling means to upstream of the divider during the time when the engine to be measured is not operating, and
- a correction means to correct the flow dividing precision of the divider based on the pressure difference value detected by the high pressure side pressure difference detection means and the low pressure side pressure difference detection means.
In 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 discharge the remaining portion to an exhaust chamber, the exhaust gas dilution apparatus characterized by comprising:
- a fixed volume sampling means provided downstream of the dilution tunnel to cause the divided exhaust gas and dilution gas to flow at a constant rate and collect samples, and
- a gas circulation means to recycle exhaust gas from the fixed volume sampling means to upstream of the divider during the time when the engine to be measured is not operating.
Dependencies are inferred from the claim text.