초록 ▼

A system is provided for limiting engine exhaust temperature to a maximum temperature limit. The system is operable to limit either a first or a second fueling parameter in accordance with an engine exhaust temperature estimation model. An engine exhaust temperature-limited fueling command is comput

A system is provided for limiting engine exhaust temperature to a maximum temperature limit. The system is operable to limit either a first or a second fueling parameter in accordance with an engine exhaust temperature estimation model. An engine exhaust temperature-limited fueling command is computed from the respective fueling parameter, and fuel supplied to the engine is limited thereby in order to maintain the actual engine exhaust temperature below the maximum temperature limit. In one embodiment, the engine exhaust temperature model is based on current values of engine speed, intake manifold temperature, mass charge flow, default fuel command parameters, and a first set of model constants. In an alternative embodiment, the engine exhaust temperature model is based on current values of engine speed, intake manifold temperature, intake manifold pressure, mass charge flow, default fueling parameters, and a second set of model constants including a lower heating value of fuel constant.

대표청구항 ▼

1. A system for controlling exhaust temperature of an internal combustion engine, comprising: a temperature sensor producing a temperature signal (IMT) corresponding to a temperature of an intake manifold of said engine; an engine speed sensor producing an engine speed signal (ESP) corresponding

1. A system for controlling exhaust temperature of an internal combustion engine, comprising: a temperature sensor producing a temperature signal (IMT) corresponding to a temperature of an intake manifold of said engine; an engine speed sensor producing an engine speed signal (ESP) corresponding to a rotational speed of said engine; means for determining a charge flow value (ECF) corresponding to a mass flow of charge entering said intake manifold; and a control circuit producing a fueling command for fueling said engine, said control circuit controlling engine exhaust temperature (TE) by limiting said fueling command based on said temperature signal, said engine speed signal and said charge flow value. 2. The system of claim 1 further including a memory unit having a maximum exhaust temperature limit (TEL) stored therein; and wherein said control circuit is operable limit said fueling command further based on said maximum exhaust temperature limit so as to maintain engine exhaust temperature below said maximum exhaust temperature limit. 3. The system of claim 2 wherein said control circuit is operable to determine start of injection (SOI) and mass fuel flow (FF) values corresponding to said fueling command; and wherein said control circuit is operable to limit said fueling command by limiting said start of injection value further based on said mass fuel flow value. 4. The system of claim 3 wherein said memory unit further includes a number of model constants stored therein; and wherein said control circuit is operable to limit said fueling command further based on said model constants. 5. The system of claim 4 wherein said control circuit is operable to compute a limited start of injection value (SOIL) according to: SOIL={TEL-IMT-A-C/(ECF/FF)-E/[ESP*(ECF/FF)]}/(B+D/ESP);