CONTROL METHOD FOR DECELERATION OF VEHICLE AND CONTROLLER

摘要

PROBLEM TO BE SOLVED: To obtain engine braking force of a vehicle, suitable for the gradient in a downhill slope. SOLUTION: In deceleration traveling of a vehicle provided with a multi- cylinder engine and a stepped automatic transmission, the actual and present acceleration of the vehicle and the reference acceleration corresponding to the present vehicle speed are found, and the number of the cylinders in which fuel cut is to be performed and the position of the shift stage of the automatic transmission are combined with each other on the basis of them. In the level 1, fuel is cut in four cylinders (all cylinders) at the fourth gear speed. In the level 2, fuel is cut in three cylinders at the third gear speed. In the level 3, fuel is cut in four cylinders at the third gear speed. In the level 4, fuel is cut in two cylinders at the second gear speed. In the level 5, fuel is cut in three cylinders at the second gear speed. In the level 6, fuel is cut in four cylinders at the second gear speed. The magnitude of firing torque is changed by changing the number of the cylinders in which fuel cut is to be performed, and the deceleration of the vehicle is changed even in the same shift stage.