F - Mech Eng,Light,Heat,Weapons – 02 – D
Patent
F - Mech Eng,Light,Heat,Weapons
02
D
341/94, 341/38.1
F02D 29/00 (2006.01) F02D 31/00 (2006.01) F02M 3/07 (2006.01)
Patent
CA 1132222
C-3097 D-3,142 Abstract of the Disclosure A vehicle engine includes throttle stop control apparatus including means effective to store a plurality of induction passage pressure numbers corre- sponding to specified values of engine speed. Further apparatus measures engine speed and induction passage pressure and compares the induction passage pressure with a control reference number derived from the induction passage pressure reference number corresponding to the measured engine speed. When the throttle is in the idle position and the induction passage pressure signal exceeds the reference, a throttle stop control loop is closed on engine speed to maintain a predeter- mined engine idle speed. However, when the throttle is in the idle position and the induction passage pressure signal does not exceed the reference, the throttle stop control loop is closed on induction passage pressure to maintain substantially the reference pressure, whereby throttle position during vehicle coastdown is controlled according to a predetermined stored schedule. The control reference number may be shifted between the induction passage pressure number and a higher number as the control is shifted between idle speed and induction passage pressure control to provide hysteresis.
341858
General Motors Corporation
Gowling Lafleur Henderson Llp
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