Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1997-10-10
1999-07-13
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
361153, F02M 2507, H01H 4700
Patent
active
059212241
ABSTRACT:
An exhaust gas recirculation valve control strategy comprised of learning and continuously updating system operating conditions that affect EGR valve control response, and controlling the EGR valve in response to the learned operating conditions for precise, robust EGR valve control. An adaptive base control signal is learned during an engine operating state where no EGR valve movement is needed, such as during engine idle. The base control signal is then continuously applied to the EGR valve, maintaining the valve at an energized level just below the beginning of valve opening. When a desired degree of opening is determined, the change in control signal is made in reference to the base control signal, reducing the magnitude of the resulting control signal change and control gains necessary to initiate valve movement, enabling faster and more stable EGR control. The base control signal is then periodically adjusted in response to fluctuations in predetermined engine parameters, such as system voltage, manifold air pressure, and EGR operating temperature.
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Bridges Michael J.
Castro Arnold
Cichosz Vincent A.
Dolinar Andrew M.
General Motors Corporation
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