1. An exhaust gas purifying system for an internal combustion engine, comprising:
an exhaust gas purifying catalyst disposed in an exhaust gas passage of the engine to remove an exhaust gas component;
a concentration sensor disposed in the exhaust gas passage downstream of the exhaust gas purifying catalyst to detect a concentration of the exhaust gas component; and
a control unit programmed to carry out
detecting an activity transition time at which the exhaust gas purifying catalyst changes from an inactive state to an active state, based on the concentration of the exhaust gas component detected by the concentration sensor, and
judging a deterioration of the exhaust gas purifying catalyst at the activity transition time.
2. An exhaust gas purifying system as claimed in claim 1, wherein the control unit is programmed to carry out the deterioration judging only immediately after a starting of the engine and during a warming-up transition time period in which the engine changes from a cold condition to a warmed-up condition.
3. An exhaust gas purifying system as claimed in claim 1, wherein the control unit is programmed to carry out the activity transition time detecting in response to a time at which the concentration of the exhaust gas component changes from a state higher than a judgment concentration to a state lower than the judgment concentration.
4. An exhaust gas purifying system as claimed in claim 1, wherein the control unit is programmed to carry out the deterioration judging in response to a condition in which a temperature of the exhaust gas purifying catalyst is higher than a judgment temperature at the activity transition time.
5. An exhaust gas purifying system as claimed in claim 1, wherein the control unit is programmed to carry out the deterioration judging in response to a condition in which a lapsed time of from a time of starting of the engine to the activity transition time is longer than a judgment time.
6. An exhaust gas purifying system as claimed in claim 1, wherein the exhaust gas purifying catalyst is a NOx trap catalyst of a type wherein NOx is adsorbed in an oxidation atmosphere and released in a reduction atmosphere, wherein the concentration sensor is a NOx sensor for detecting a concentration of NOx.
7. An exhaust gas purifying system for an internal combustion engine, comprising:
an exhaust gas purifying catalyst disposed in an exhaust gas passage of the engine to remove an exhaust gas component, the exhaust gas purifying catalyst being a NOx trap catalyst of a type wherein NOx is adsorbed in an oxidation atmosphere and released in a reduction atmosphere;
a concentration sensor disposed in the exhaust gas passage downstream of the exhaust gas purifying catalyst to detect a concentration of the exhaust gas component, the concentration sensor being a NOx sensor for detecting a concentration of NOx; and
a control unit programmed to carry out
detecting an activity transition time at which the exhaust gas purifying catalyst changes from an inactive state to an active state, in accordance with the concentration of the exhaust gas component detected by the concentration sensor, and
judging a deterioration of the exhaust gas purifying catalyst at the activity transition time,
accomplishing a compulsory sulfur poisoning releasing processing for the NOx trap catalyst after an initial judgment of the deterioration of the NOx trap catalyst,
judging as to whether the NOx trap catalyst is subjected to a sulfur poisoning after a second judgment of the deterioration of the NOx trap catalyst and after the sulfur poisoning releasing processing, and
generating a warning when the NOx trap catalyst is judged not to be subjected to the sulfur poisoning.
8. An exhaust gas purifying system for an internal combustion engine, comprising:
an exhaust gas purifying catalyst disposed in an exhaust gas passage of the engine to remove an exhaust gas component;
means for detecting a concentration of the exhaust gas component in the exhaust gas passage downstream of the exhaust gas purifying catalyst;
means for detecting an activity transition time at which the exhaust gas purifying catalyst changes from an inactive state to an active state, based on the concentration of the exhaust gas component detected by the concentration detecting means; and
means for judging a deterioration of the exhaust gas purifying catalyst at the activity transition time.
9. A method of purifying exhaust gas discharged from an internal combustion engine provided with an exhaust gas purifying catalyst disposed in an exhaust gas passage of the engine to remove an exhaust gas component, the exhaust gas purifying method comprising:
detecting a concentration of the exhaust gas component in the exhaust gas passage downstream of the exhaust gas purifying catalyst;
detecting an activity transition time at which the exhaust gas purifying catalyst changes from an inactive state to an active state, based on the detected concentration of the exhaust gas component; and
judging a deterioration of the exhaust gas purifying catalyst at the activity transition time.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What I claim is:
1. A method of treating the disease of a type selected from peripheral vascular diseases, peripheral neuropathies, and autonomic neuropathies, comprising administering an effective amount of a pharmaceutical composition comprising a cGMP PDE5 inhibitor or a derivative or salt thereof.
2. A method of treating a disease according to claim 1 wherein said disease is selected from the group consisting of Raynaud’s Phenomenon, CREST syndrome, erythromatosis, rheumatoid diseases and diabetic retinopathies.
3. A method of treating onychiomycosis comprising administering an effective amount of a pharmaceutical composition comprising a cGMP PDE5 inhibitor or a derivative or salt thereof.
4. A method of treating a patient suffering from diabetic foot ulcers which comprises treating said patient with an effective amount of a pharmaceutical composition comprising a cGMP PDE5 inhibitor or a derivative or salt thereof.
5. A method of preventing the formation of foot ulcers in a patient suffering from the disease diabetes, the method comprising administering to said patient an effective amount of a pharmaceutical composition comprising a cGMP PDE5 inhibitor or a derivative or salt thereof.
6. A method of manufacturing a diabetic foot ulcer therapeutic comprising providing an effective ingredient selected from the group consisting of a cGMP PDE5 inhibitor, a derivative thereof, and a salt thereof and combining said effective ingredient with a suitable carrier for administration to a patient.
7. A method according to claim 4 or 5, wherein the cGMP PDE5 inhibitor is sildenafil.