PURPOSE: To control the quantity of exhaust flowed back, by producing adequate control negative pressure by installing a plurality of opening and closing valves for opening to the atmospheric air to a control passage for introducing control negative pressure to an exhaust reflux control valve and by swtiching the opening and closing valves ON-OFF according to engine operational conditions.
CONSTITUTION: The number of revolution of an engine detected by means of a distributor 41 is input to a memory matrix 39' containing a memory circuit 38 through a rotary detector 43 and an X address decoder 44. The negative pressure Pb of a Venturi detected by means of a negative pressure sensor is input to the memory matrix 39' through an analog digital converter 45, a negative pressure detector 46 and a Y address decoder 47. The optimum quantity of exhaust flowed back is decided on the basis of operational conditions input in two-dimensional shapes, the quantity is input to an opening and closing valve functioning control circuit 40 and opening and closing valves 33, 34, 35 for opening to the atmospheric air are controlled in the memory matrix 39'.
NAKASHIMA YASUO
BITOU HIROMICHI
MURATA EIJI
| JPS5281430A | 1977-07-07 | |||
| JP51053312B | ||||
| JPS538422A | 1978-01-25 |
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