| 摘要 |
PURPOSE:To improve the fuel consumption rate by controlling the number of cylinders in operation on the basis of the result of comparison between the amount of total fuel consumption in a unit time with the present number of cylinders in operation and the supposed amount of total fuel consumption in case when the number of cylinders in operation is varied, maintaining the present output. CONSTITUTION:When an engine 1 is in operation, each output of a crank-angle sensor 3 and a combustion pressure sensor 4 is amplified 5 and sent into a Pi (average effective pressure shown in the figure) meter 6, and the average effective pressure Pi in one cycle in each cylinder is detected, and said detected value is sent into a control circuit 7. With the aid of said control circuit 7, the fuel consumption rate mf (m is cylinder No.) of each cylinder is obtained from a fuel consumption map consisting of the average effective pressure Pi and engine revolution number Ne as parameters, when the opening degree of an accelerator is in the predetermined state, and the total fuel consumption rate Tf of the whole cylinders in operation is obtained from said fuel consumption rate mf. Further, the supposed total fuel consumption rate XTf in case when the number of cylinders in operation is varied tentatively in the state where the present output is maintained, is obtained, and the number of cylinders in operation is controlled on the basis of the result of comparison between Tf and XTf. |
