초록 ▼

A system for estimating NOx content of exhaust gas produced by an internal combustion engine includes a control computer operable to estimate an exhaust temperature corresponding to temperature of exhaust gas produced by the engine, to determine an EGR fraction corresponding to a fractional amount o

A system for estimating NOx content of exhaust gas produced by an internal combustion engine includes a control computer operable to estimate an exhaust temperature corresponding to temperature of exhaust gas produced by the engine, to determine an EGR fraction corresponding to a fractional amount of recirculated exhaust gas present in an air charge supplied to the engine, and to estimate an emissions index, corresponding to a fuel rate normalized, mass-based NOx concentration of the exhaust gas produced by the engine, as a function of the exhaust temperature and the EGR fraction. The control computer is further operable to determine a mass flow rate of fresh air entering the intake manifold and a fuel mass flow rate, and estimate the NOx content by volume of the exhaust gas produced by the engine as a function of charge mass flow value, the fuel mass flow value and the emissions index value.

대표청구항 ▼

A system for estimating NOx content of exhaust gas produced by an internal combustion engine includes a control computer operable to estimate an exhaust temperature corresponding to temperature of exhaust gas produced by the engine, to determine an EGR fraction corresponding to a fractional amount o

A system for estimating NOx content of exhaust gas produced by an internal combustion engine includes a control computer operable to estimate an exhaust temperature corresponding to temperature of exhaust gas produced by the engine, to determine an EGR fraction corresponding to a fractional amount of recirculated exhaust gas present in an air charge supplied to the engine, and to estimate an emissions index, corresponding to a fuel rate normalized, mass-based NOx concentration of the exhaust gas produced by the engine, as a function of the exhaust temperature and the EGR fraction. The control computer is further operable to determine a mass flow rate of fresh air entering the intake manifold and a fuel mass flow rate, and estimate the NOx content by volume of the exhaust gas produced by the engine as a function of charge mass flow value, the fuel mass flow value and the emissions index value. the at least one wheel of the vehicle, based on the total control quantity, wherein the controller calculates the total control quantity, based on a first control quantity for achieving the target roll angle by feed-forward control, and a second control quantity for achieving the target roll angle by feedback control, the first control quantity being calculated based on the running condition of the vehicle, the second control quantity being calculated based on a deviation of an actual roll angle of the vehicle from the target roll angle, and wherein the controller calculates the second control quantity, based on a first control-quantity component based on a deviation of an actual roll angle of the vehicle from the target roll angle, and a second control-quantity component based on an actual roll velocity of the vehicle. 5. The rolling control apparatus according to claim 4, wherein the second control quantity is calculated as a linear sum of the first control-quantity component and the second control-quantity component. 6. A rolling control apparatus for controlling rolling of a vehicle by controlling braking force applied to at least one wheel of the vehicle, comprising a controller that: sets a target roll angle of the vehicle based on a rolling state of the vehicle; calculates a total control quantity for achieving the target roll angle, based on a running condition of the vehicle; and controls the braking force applied to each of the at least one wheel of the vehicle, based on the total control quantity, wherein the controller calculates the total control quantity, based on a first control quantity for achieving the target roll angle by feed-forward control, and a second control quantity for achieving the target roll angle by feedback control, the first control quantity being calculated based on the running condition of the vehicle, the second control quantity being calculated based on a deviation of an actual roll angle of the vehicle from the target roll angle, wherein the first control quantity comprises a first target yaw moment, and the second control quantity comprises a second target yaw moment, and wherein the controller calculates a final target yaw moment as the total control quantity, based on at least the first target yaw moment and the second target yaw moment. 7. The rolling control apparatus according to claim 6, wherein the controller calculates the final target yaw moment as a sum of the first target yaw moment and the second target yaw moment. 8. The rolling control apparatus according to claim 6, wherein the controller calculates the second target yaw moment, based on a first yaw-moment component based on a deviation of an actual roll angle of the vehicle from the target roll angle, and a second yaw-moment component based on an actual roll velocity of the vehicle. 9. The rolling control apparatus according to claim 8, wherein the second yaw moment is calculated as a linear sum of the first yaw-moment component and the second yaw-moment component. 10. The rolling control apparatus according to claim 6, wherein the controller calculates a target braking amount of each of the at least one wheel for applying a yaw moment corresponding to the final target yaw moment to the vehicle, and controls a braking force applied to said each of the at least one wheel, based on the target braking amount. 11. The rolling control apparatus according to claim 6, wherein the controller calculates a target deceleration of the vehicle that corresponds to the final target yaw moment, calculates a target braking amount of each of the at least one wheel for achieving the target deceleration, and controls a braking force applied to said each of the at least one wheel, based on the target braking amount. 12. The rolling control apparatus according to claim 6, wherein the controller calculates a target deceleration of the vehicle that corresponds to the final target yaw moment, calculates a target braking amount of each of