F - Mech Eng,Light,Heat,Weapons – 02 – P
Patent
F - Mech Eng,Light,Heat,Weapons
02
P
317/5.35
F02P 5/04 (2006.01) F02P 5/145 (2006.01) F02P 5/152 (2006.01)
Patent
CA 1191196
C-3357 D-5,713 COMBINED CLOSED LOOP AND ANTICIPATING KNOCK LIMITING SPARK TIMING SYSTEM Abstract of the Disclosure A closed loop knock control system integrates a knock signal comprising knock intensity indicating knock pulses from an engine mounted knock sensor into a retard voltage in an integrating amplifier normally provided with a fixed reference voltage through a series pair of resistors. The junction of the series pair of resistors is connected through another resistor and a semiconductor switch, when the switch is actuated, to a second constant reference voltage greater in the retard direction than the first. An open loop knock anticipating system responds to a detected knock anticipating event by actuating the semiconductor switch means for a predetermined time duration to produce a step change in the retard direction for the predetermined time duration in the retard voltage and thus in the spark timing. If voltage limiting means is provided in the closed loop system for the output of the integrator, the summed combination of the closed and open loop retard voltages is also limited thereby.
411965
Mowery Kenneth D.
Pechous Leslie J.
General Motors Corporation
Gowling Lafleur Henderson Llp
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