| 摘要 |
PURPOSE:To make it possible to improve the fuel milage of an alcohol-reformed gas engine, by controlling the supply amounts of air, reformed gas and alcohol in dependence upon the manipulated value of an accelerator, the speed of the engine and the supply pressure of reformed gas, and as well by carrying out feedback control with the utilization of the concentration of O2 in exhaust gas. CONSTITUTION:A load arithmetic unit 46 calculates a load factor L in dependence upon a manipulated value S of an accelerator and a rotational speed Ne, and a gas/fuel arithmetic unit 47 calculates a ratio alphago in accordance with the load factor L. Meanwhile, a limited gas/fuel ratio arithmetic unit 49 calculates a limited gas/fuel ratio alphaglim in accordance with the gas pressure Pg, and a setting unit 50 delivers the ratio alphago or the limited gas/ fuel ratio alphaglim, which ever is smaller, to arithmetic units 51 through 53 of gas flow, alcohol flow and excess air rate, respectively. An air valve 35 is controlled for obtaining an excess air rate lambdao corresponding to the gas/fuel ratio alphag, thereby the excess air rate lambda is optimumly controlled since the opening degreed of the air valve 35 is controlled under feedback correction of the output of an O2 sensor 42. |
