F - Mech Eng,Light,Heat,Weapons – 02 – M
Patent
F - Mech Eng,Light,Heat,Weapons
02
M
341/38.1
F02M 25/06 (2006.01) F02B 47/10 (2006.01) F02D 21/08 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1210475
- 23 - Method and Apparatus for Controlling Diesel Engine Exhaust Gas Recirculation Partly as a Function of Exhaust Particulate Level Abstract A method and apparatus for controlling the re- circulation of exhaust gas in a diesel engine in- cludes an EGR valve responsive to an EGR control signal for relatively opening and closing a recir- culation duct to the passage of exhaust gas there- through. A sensor provides a signal indicative of the level of particulates in the exhaust gas stream. Control circuitry responsive to various signals in- dicative of engine operating conditions, including the signal indicative of exhaust gas particulate level, provides an EGR control signal for regulating the EGR valve at least partly as a function of the sensed level of particulates in the exhaust gas stream. The engine operating condition signals ty- pically are indicative of the speed of the engine or fuel injection pump, the engine load, and engine operating temperature. The particulate level signal is preferably provided by electrostatically sensing the passage of packets of charged particles by an electrically-passive, annular electrode positioned in or adjacent to the exhaust gas stream. The control circuitry includes storage of open loop EGR valve control signals as a function of speed and load, as well as particulate objective signals also as a function of speed and load. The sensed exhaust gas particulate level is compared with the appropriate particulate objective signal for the development of an error signal, which error signal is then used in an adaptive manner to adjust the open loop EGR control signal in a direction to - 24 - diminish the particulate error signal. Such adap- tive control of the EGR control signal as a function of the exhaust gas particulate level is further ad- vantageous because a predeterminable relationship exists between exhaust particulate levels and NOx levels as a function of percent EGR. EGR control may be inhibited by depressed engine temperature.
437703
Bullis Robert H.
Kimberley John A.
Ambac Industries Incorporated
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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