Exhaust gas reflux mount adjusting device
A technology of exhaust gas backflow and return flow, which is applied in the direction of exhaust devices, noise reduction devices, exhaust treatment device diagnostic devices, etc., can solve the problems of reducing operation failures, and achieve the effect of reducing operation failures and possibilities
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no. 1 approach
[0052] now refer to figure 1 An exhaust gas return flow regulating device according to an embodiment of the present invention will be described. An intake pipe 11 and an exhaust pipe 12 are connected to cylinders 10 of the internal combustion engine. A catalyst 13 and a muffler 14 are fitted to the exhaust pipe 12 . The catalyst 13 purifies exhaust gas. The EGR gas passage 15 is configured to connect the downstream side of the catalyst 13 of the exhaust pipe 12 to the intake pipe 11 . The EGR gas passage 15 guides the exhaust gas back to the intake pipe 11 . An EGR cooler 16 is formed in the EGR gas passage 15 . An EGR valve 17 is provided in the EGR gas passage 15 . The EGR valve 17 regulates the return amount of EGR gas to be introduced back into the intake pipe 11 . An air-fuel ratio sensor (A / F sensor) 21 is formed on the upstream side of the catalyst 13 of the exhaust pipe 12 . An oxygen sensor (O 2 sensor) 22 is formed on the downstream side of the catalyst 13 of...
no. 3 approach
[0067] will refer to Figure 8 An EGR gas return flow restricting device 30B of an exhaust gas return flow adjusting device according to another embodiment will be described. The EGR gas return flow limiting device 30B includes an ignition switch judging unit 34, a time after startup judging unit 35, a catalytic converter degradation degree calculation / recording unit 36, a catalytic converter deterioration degree average calculation unit 37, a continuous restriction mode judgment unit 38, a restriction cancel A judging unit 39 , a restriction start judging unit 40 , an EGR gas return flow restriction indicating unit 33B, and a continuous restriction mode recording unit 41 .
[0068]The ignition switch judging unit 34 judges whether the ignition switch 23 is turned on.
[0069] When the post-start time judging unit 35 has judged that the ignition switch 23 is turned on, it then judges whether a predetermined time has elapsed after the engine was started.
[0070] When the pos...
Embodiment approach
[0084] Note that, according to the above-described embodiment, the first predetermined value is set to 0.43, and the second predetermined value is set to 0.15. Alternatively, the first and second predetermined values may also be set to other values.
[0085] Furthermore, although in the above-described embodiment, the air-fuel ratio sensor 21 and the oxygen sensor 22 are used as the upstream oxygen sensor and the downstream oxygen sensor, respectively, an oxygen sensor provided on the upstream side of the catalyst 13 may also be used as the upstream oxygen sensor. , and an air-fuel ratio sensor provided on the downstream side of the catalyst 13 may be used as a downstream oxygen sensor. In addition, various sensors capable of detecting the oxygen content in exhaust gas can be used as the upstream oxygen sensor and the downstream oxygen sensor.
[0086] Furthermore, in the first embodiment, when the catalytic converter deterioration degree judging unit 32 judges that the cat...
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