| 主权项 |
1. An engine control system for a vehicle, comprising: an exhaust gas recirculation (EGR) rate-estimation module that receives a first signal indicating a first relative humidity of a flow of air, that receives a second signal indicating a second relative humidity of a mixed flow of air and exhaust gas, and that determines an estimated EGR rate based on the first relative humidity and the second relative humidity, wherein the estimated EGR rate corresponds to a flow rate of a flow of exhaust gas to an engine; and a control module that selectively adjusts an engine operating parameter based on the estimated EGR rate, wherein the EGR rate-estimation module converts the first relative humidity of the flow of air to a specific humidity of the flow of air, converts the second relative humidity of the mixed flow of air and exhaust gas to a specific humidity of the mixed flow of air and exhaust gas, estimates, based on a fuel type, an equivalence ratio (EQR), and a combustion efficiency, a specific humidity of the flow of exhaust gas to the engine, and determines the estimated EGR rate based on the specific humidity of the flow of air, the specific humidity of the mixed flow of air and exhaust gas, and the specific humidity of the flow of exhaust gas to the engine, wherein, to determine the estimated EGR rate, the EGR rate-estimation module calculates the estimated EGR rate according to EGRrate=(1+SHEGR)(SHind-SHman)(1+SHind)(SHman-SHEGR)+(1+SHEGR)(SHind-SHman), where EGRrate corresponds to the estimated EGR rate, where SHEGR corresponds to the estimated specific humidity of the flow of exhaust gas to the engine, SHind corresponds to the specific humidity of the flow of air, and SHman corresponds to the specific humidity of the mixed flow of air and exhaust gas. |
