Abstract: An exhaust gas recirculation systems directs exhaust gasses from an exhaust manifold to an intake manifold of an internal combustion engine. The exhaust gasses travel from the exhaust manifold, first passing through a flow control valve and then through a measuring orifice before entering the intake manifold. Pressure difference across the orifice is used, along with correction factors based on the pressure difference and pressure downstream of the orifice, to measure and control exhaust gas flow. Further, manifold pressure is determined from downstream pressure and the used along with the measured exhaust gas flow to calculated a cylinder air charge amount.
Type:
Grant
Filed:
March 2, 2000
Date of Patent:
November 27, 2001
Assignee:
Ford Global Technologies, Inc.
Inventors:
Allan Joseph Kotwicki, Freeman Carter Gates, John David Russell
Abstract: To provide a failure diagnosis apparatus for an exhaust gas recirculation system which is capable of eliminating the influence of various disturbance factors that vary the suction air pressure, diagnosing a failure of the exhaust gas recirculation system on the basis of the suction air pressure, and preventing wrong diagnosis. A failure diagnosis apparatus for an exhaust gas recirculation system consists of a fresh air pressure estimating means 2911 for calculating an estimated fresh air pressure inside a suction pipe from the operating condition of an internal combustion engine, an actual EGR (exhaust gas recirculation) gas pressure estimating means 2914 for estimating an EGR gas pressure on the basis of a measured suction pipe pressure detected by a suction pipe pressure detecting means 2911 and an estimated fresh air pressure calculated above, and a failure judging means 2910 for judging the failure on the basis of the estimated EGR gas pressure and the detected operating condition.
Type:
Application
Filed:
February 27, 2001
Publication date:
November 1, 2001
Inventors:
Satoru Osaki, Toshio Hori, Osamu Matsuno, Takeshi Tsuyuki
Abstract: An exhaust gas recirculation systems directs exhaust gasses from an exhaust manifold to an intake manifold of an internal combustion engine. The exhaust gasses travel from the exhaust manifold, first passing through a flow control valve and then through a measuring orifice before entering the intake manifold. Pressure difference across the orifice is used, along with correction factors based on the pressure difference and pressure downstream of the orifice, to measure and control exhaust gas flow.
Type:
Grant
Filed:
January 11, 1999
Date of Patent:
October 30, 2001
Assignee:
Ford Global Technologies, Inc.
Inventors:
Allan Joseph Kotwicki, John David Russell
Abstract: A system and a method for recirculating a flow of exhaust gases. The system comprises a passage through which the exhaust gas flow passes, a valve movable in the passage between a generally open configuration and a generally closed configuration, an actuator operatively connected to the valve, and a fail-safe returning the valve to one of the generally open and generally closed configurations if the actuator is disabled. The generally open configuration of the valve substantially permits the exhaust gas flow to pass through the passage, and the generally closed configuration of the valve substantially prevents the exhaust gas flow from passing through the passage. The actuator includes a one-way driver and a release to move the valve between the generally open and generally closed configurations and to vary the exhaust gas flow though the passage. The method comprises energizing the actuator with a power supply, and moving the valve to a fail-safe position if the power supply fails.
Abstract: An EGR system monitor combines an inferred manifold absolute pressure based on measured mass air flow with a measured manifold absolute pressure to obtain a more complete system response during a test procedure involving the opening and closing of the EGR valve.
Type:
Grant
Filed:
February 3, 2000
Date of Patent:
July 10, 2001
Assignee:
Ford Global Technologies, Inc.
Inventors:
David Karl Bidner, Douglas Raymond Martin, Michael John Cullen
Abstract: A method and a device for controlling an internal combustion engine. An actuator serves to influence the quantity of exhaust gas recirculated. A loop controller preselects the quantity of exhaust gas to be recirculated on the basis of a setpoint and an actual value which characterizes the quantity of exhaust gas recirculated. A first measured value is determined in a first position (open) of the actuator, and a second measured value is determined in a second position (closed) of the actuator, with the actual value or a correction value being preselectable on the basis of the difference between the two measured values.
Type:
Grant
Filed:
August 30, 1999
Date of Patent:
July 3, 2001
Assignee:
Robert Bosch GmbH
Inventors:
Gerhard Engel, Joachim Berger, Manfred Birk, Manfred Strohrmann, Peter Rupp
Abstract: An exhaust gas recirculation systems directs exhaust gasses from an exhaust manifold to an intake manifold of an internal combustion engine. The exhaust gasses travel from the exhaust manifold, first passing through a flow control valve and then through a measuring orifice before entering the intake manifold. Pressure difference across the orifice is used, along with correction factors based on the pressure difference and pressure downstream of the orifice, to measure and control exhaust gas flow.
Type:
Grant
Filed:
June 30, 2000
Date of Patent:
February 6, 2001
Assignee:
Ford Global Technologies, Inc.
Inventors:
Allan Joseph Kotwicki, John David Russell