Multiple cylinder engine

Abstract

A multiple cylinder engine controls an air/fuel ratio accurately by improved detection of the fluctuations in a vacuum due to a change in the openings of throttle valves. The multiple cylinder engine comprises: a plurality of intake passages 11a and 11b for feeding intake air to cylinders 2 and 3 independently of each other; fuel injectors 6 and 7 and throttle valves 4c provided for the intake passages; a pressure sensor C for detecting the pressure of one of the intake passages 11a and 11b; and fuel control means 20 for controlling the injection quality of the fuel injectors 6, 7 of each cylinder by using the detected pressure. The multiple cylinder engine may further comprise a vacuum inlet passage 18 having a inlet port 18a opened into intake passages 11a or 11b that introduces the pressure of the intake passages 11a or 11b into the pressure sensor C. The vacuum inlet passage 18 includes a throttle portion 18b preferably having a passage area of no more than one ninth that of the inlet port 18a.

Dependencies are inferred from the claim text.