Electronic circuit to close slow running jet at over-run - has schmitt trigger with hysteresis ratio to partly restore fuel at predetermined low engine speed

摘要

The slow running switch off valve at closed throttle above a certain defined speed, (1800 r.p.m), closes the slow running fuel jet. Independently from the throttle valve position below a second defined speed (1300 r.p.m) the fuel feed is reintrod- at approximately 50 per cent of the normal feed rate. The slow running switch off valve is connected to an NAND gate whose first input receives a signal only when speed increases above the higher limit and decreases as far as the lower limit. The second input is connected to the ignition contact breakers via a schmitt trigger circuit, with hysteresis ratio.