| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem on wheel driving force, that the, calculating accuracy of a road surface gradient is lowered by influence by the secular degradation of an engine when calculating the wheel driving force on the basis of output torque of the engine in calculating a gradient of a road surface from the wheel driving force and vehicle acceleration. SOLUTION: Fluid transmission torque TQtr of a torque converter is calculated from the torque ratioκof the torque converter corresponding to the speed ratio etr of the torque converter, an input shaft torque factorτand an input rotating speed (an engine speed) Ne of the torque converter (S21-3), and the road surface gradient is calculated by using the wheel driving force calculated on the basis of the torque TQtr. |
