Internal-combustion engines – Starting device – Control of spark ignition during starting
Patent
1991-08-27
1992-09-15
Dolinar, Andrew M.
Internal-combustion engines
Starting device
Control of spark ignition during starting
123 1A, 12317916, 123491, 123634, F02D 4300, F02D 4106
Patent
active
051468824
ABSTRACT:
A method and apparatus for enhancing the cold starting performance of a spark ignition, internal combustion engine fueled with an alcohol-based fuel mixture is described. The quantity of fuel mixture delivered to the engine is regulated to establish a combustible fuel vapor-air mixture in each engine cylinder during cranking, while restricting the accumulation of unvaporized fuel in the each cylinder so as not to exceed a predetermined amount. In addition, each cylinder spark plug is provided with an ignition current having a peak magnitude sufficient to achieve voltage break down across each spark plug arc gap, when each gap is resistively loaded due to wetting in accordance with the predetermined amount of accumulated unvaporized fuel. Preferably, the quantity of fuel delivered to the engine during cranking is reduced at a substantially exponential rate as a function of the cumulative number of revolutions the engine is rotated during cranking. An ignition coil having a secondary to primary winding turns ratio in the order of 65:1, with its secondary winding wrapped onto a plurality of partitions in a segmented dielectric bobbin, is employed to provide the required ignition current for firing the engine spark plugs when the predetermined amount of unvaporized fuel accumulates in the engine cylinders.
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"Capacitive Discharge/Inductive Ignition System," disclosed by Daniel H. Hopper, Research Disclosure No. 28035, Aug. 1987.
"Cold Starts Using M-85 (85% Methanol): Coping with Low Fuel Volatility and Spark Plug Wetting," C. J. Dasch, N. H. Brinkman, and D. H. Hopper, SAE Paper No. 910865, 1991. (Feb. 25-Mar. 1).
Brinkman Norman D.
Dasch Cameron J.
Hopper Daniel H.
Rockwell Lynn A.
Delco Electronics Corporation
Dolinar Andrew M.
Funke Jimmy L.
General Motors Corporation
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