초록 ▼

Method and apparatus are provided for estimating gas temperatures of a vehicle engine. The method comprises receiving a velocity of the vehicle and an air mass flow rate and estimating an exhaust gas temperature based at least upon the velocity of the vehicle and the air mass flow rate. The method a

Method and apparatus are provided for estimating gas temperatures of a vehicle engine. The method comprises receiving a velocity of the vehicle and an air mass flow rate and estimating an exhaust gas temperature based at least upon the velocity of the vehicle and the air mass flow rate. The method also comprises receiving an EGR mass flow rate and estimating an EGR gas temperature at an EGR valve based at least upon the exhaust gas temperature and the EGR mass flow rate. In addition, the method comprises estimating an EGR gas temperature at a throttle body based at least upon the exhaust gas temperature and the EGR mass flow rate. Furthermore, the method comprises estimating a charge temperature based at least upon the EGR gas temperature at the throttle body, the velocity of the vehicle, and the EGR mass flow rate.

대표청구항 ▼

Method and apparatus are provided for estimating gas temperatures of a vehicle engine. The method comprises receiving a velocity of the vehicle and an air mass flow rate and estimating an exhaust gas temperature based at least upon the velocity of the vehicle and the air mass flow rate. The method a

Method and apparatus are provided for estimating gas temperatures of a vehicle engine. The method comprises receiving a velocity of the vehicle and an air mass flow rate and estimating an exhaust gas temperature based at least upon the velocity of the vehicle and the air mass flow rate. The method also comprises receiving an EGR mass flow rate and estimating an EGR gas temperature at an EGR valve based at least upon the exhaust gas temperature and the EGR mass flow rate. In addition, the method comprises estimating an EGR gas temperature at a throttle body based at least upon the exhaust gas temperature and the EGR mass flow rate. Furthermore, the method comprises estimating a charge temperature based at least upon the EGR gas temperature at the throttle body, the velocity of the vehicle, and the EGR mass flow rate. ressurizing phase of a leak detection test; disposing a restriction between the pump and the space being pressurized to create a chamber where, as the pump is repeatedly stroked, causes a real time pressure trace of pressure to comprise a succession of pulses having peaks and valleys; and sensing pressure in the chamber as the pump is stroked and processing data, including the sensed pressure, to develop data related to pump operating efficiency. 5. In a leak detection system for a fuel system of an automotive vehicle that contains volatile fuel for operating the vehicle, a leak detection method comprising: repeatedly stroking a diaphragm pump to pressurize a vapor containment space of the fuel system during a leak detection test; and disposing a restriction between the pump and the space being pressurized to cause a real time pressure trace of pressure between the pump and the restriction to comprise a succession of pulses having peaks and valleys; and determining the difference between the peaks and valleys and adjusting the number of times that the pump is subsequently stroked to maintain a substantially constant mass airflow into the space as efficiency of the pump changes. 6. In a leak detection system for a fuel system of an automotive vehicle that contains volatile fuel for operating the vehicle, a leak detection method comprising: repeatedly stroking a diaphragm pump to pressurize a vapor containment space of the fuel system during a leak detection test; and disposing a restriction between the pump and the space being pressurized to cause a real time pressure trace of pressure between the pump and the restriction to comprise a succession of pulses having peaks and valleys; and determining residual pressure when pump stroking ceases and adjusting the number of times that the pump is subsequently stroked to maintain a substantially consultant mass airflow into the space as efficiency of the pump changes. 7. A method for self-compensating a volumetric pump for decreasing volumetric efficiency so as to maintain a desired mass gas flow into a closed test space being tested for leakage, the method comprising: operating the pump to pressurize the space during a leak detection test; disposing a restriction between the pump and the space being pressurized to cause a real time pressure trace of pressure between the pump and the restriction to comprise a succession of pulses having peaks and valleys; and utilizing data from the pressure trace to adjust pump operation to cause the pump to maintain the desired mass gas flow as pump efficiency changes. 8. A leak detection method as set forth in claim 4 including: changing the number of times that the pump is stroked during the pressurizing phase when the processing of data discloses a change in pump operating efficiency. a hydroxyl group content of at least 100 wt.-ppm. 4. Method according to claim 1, characterized in that the core glass is adjusted to a hydrogen content of at least 2×1015molecules/cm3. 5. Method according to claim 1, characterized in that the adjustment of the hydrogen content comprises a heat treatment, a treatment under vacuum, and/or a treatment of the core glass in a chemically reactive atmosphere. 6. Method according to claim 5, characterized in that the core glass is annealed at a temperature of at least 600° C. 7. Method according to claim 1, characterized in that the fiber is charged with hydrogen after drawing from the preform. 8. Method according to claim 7, characterized in that the fiber is formed with a fiber core, and that a hydrogen content of at least 1×1018molecules/cm3is set by the hydrogen charging, at least in the fiber core.