EXHAUST GAS CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE Russian patent published in 2017 - IPC F01N3/08 F02D21/08 F02D41/04 F02M26/05 F02M26/06 

FIELD: engine devices and pumps.

SUBSTANCE: engine (1) includes an engine inlet (6), a throttle valve (10), an engine exhaust (12a), a turbocharger (7) driven by an exhaust system, a high pressure side (16H) channel for recirculating exhaust gases on the high pressure side, channel (16L) for exhaust gas recirculation on the low pressure side, a control valve (17H) for exhaust gas recirculation on the high-pressure side, a control valve (17L) for recirculating exhaust gases on the low-pressure side. The exhaust gas control unit includes an electronic control unit (30) configured to control the mixture enrichment to temporarily degrade the air-fuel mixture of exhaust gas by injecting additional fuel into the cylinder during expansion stroke or exhaust stroke when the opening ratio of throttling valve (10) switches from the basic throttle opening degree to the throttle opening ratio to control the mixture enrichment below the basic throttle opening degree. The ratio of exhaust gas recirculation on the high-pressure side is switched from the base ratio of exhaust gas recirculation on the high-pressure side to the exhaust gas recirculation ratio on the high-pressure side to control the mixture enrichment, different from the base ration. The ratio of exhaust gas recirculation on the low-pressure side is switched from the base ratio of the exhaust gas recirculation on the low-pressure side to the exhaust gas recirculation ratio on the low-pressure side to control the mixture enrichment, different from the base ratio. The electronic control unit (30) is configured to initiate the mixture enrichment control by controlling the opening ratio of the control valves (17H) and (17L), switching the throttle opening ratio to control the mixture enrichment, and then initiating the injection of additional fuel.

EFFECT: suppression of the risk of ignition misfire, when the control of mixture enrichment is initiated.

9 cl, 38 dwg