H - Electricity – 01 – H
Patent
H - Electricity
01
H
341/38.11
H01H 47/32 (2006.01) F02D 1/00 (2006.01) F02D 41/20 (2006.01) H03K 17/16 (2006.01) H03K 17/296 (2006.01) H03K 17/64 (2006.01) H03K 17/693 (2006.01)
Patent
CA 1252179
-31- Fuel Injection Solonoid Driver Circuit Abstract of the Disclosure A fuel injection solenoid driver circuit controllably connects and disconnects a solenoid coil to and from a storage capacitor to effect operation of the coil. Precise control of the timing and duration of coil is necessary to ensure that a proper quantity of fuel is delivered to each cylinder of an internal combustion engine. A means monitors the voltage level of the storage capacitor and periodically delivers a high voltage inductive spike to the capacitor to maintain the capacitor voltage level within presribed limitations. Further, a means aids in charging the capacitor by discharging the solenoid coil to the capacitor in response to the coil and capacitor being disconnected. Use of the energy stored in the coil to recharge the capacitor increases the power efficiency of the circuit and also results in a fast decay of the solenoid voltage. The fast decay time minimizes variations in solenoid operation timing and duration and precisely controls the quantity of fuel delivered.
512784
Caterpillar Inc.
Kirby Eades Gale Baker
LandOfFree
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