Patent ID: 8112205
Filing Date: 2012-02-07
Classification: F02D,Y10T

Abstract:
1. A device for controlling a power train of a motor vehicle configured to deliver set-point signals of torque to be applied to wheels of the motor vehicle, comprising: means for generating a limitation of variation in speed of a heat engine incorporated in the power train, including a first signal to limit speed variations in an increasing direction during a predetermined time interval below an upper limit value and a second signal to limit speed variations in a decreasing direction during the predetermined time interval above a lower limit value, the means for generating being configured to reduce noise generated by the variations that are disturbing from an acoustic point of view of the power train; and means for determining an operating point of the power train in an optimal operating range according to the first signal and the second signal such that the variations of the speed of the heat engine are maintained between the upper and lower limit values, wherein the means for generating receives parameters representative of characteristics of the motor vehicle, and parameters representative of wishes of the driver, including parameters representative of a position of an accelerator pedal, parameters representative of a position of a brake pedal, and a parameter representative of a gradient of the position of the accelerator pedal, wherein the means for generating sets the upper limit value to a first upper limit value and the lower limit value to a first lower limit value when depression of the accelerator pedal is greater than a first predetermined position threshold corresponding to a depression state beyond a hard point of the accelerator pedal, the first upper limit value and the first lower limit value correspond to maximum performance levels of the power train, wherein the means for generating sets the upper limit value to a second upper limit value and the lower limit value to a second lower limit value when the depression of the accelerator pedal is greater than a second predetermined position threshold corresponding to a depression state of the accelerator pedal and less than the first predetermined position threshold, the second upper limit value being calculated from a first positive speed variation map and the second lower limit value being calculated from a first negative speed variation map, wherein the means for generating sets the upper limit value to a third upper limit value and the lower limit value to a third lower limit value when the depression of the accelerator pedal is lower than a third predetermined position threshold corresponding to a depression state of the accelerator pedal, the third predetermined position threshold being less than the second predetermined position threshold, the third upper limit value being calculated from a second positive speed variation map and the third lower limit value being calculated from a second negative speed variation map, wherein the means for generating sets the upper limit value to a fourth upper limit value and the lower limit value to a fourth lower limit value when a depression gradient of the accelerator pedal is greater than a first position variation threshold corresponding to a fast depression of the accelerator pedal, and the depression of the accelerator pedal is greater than the third predetermined position threshold and less than the second predetermined position threshold, the fourth upper limit value being calculated from a third positive speed variation map and the fourth lower limit value being calculated from a third negative speed variation map, wherein the means for generating sets the upper limit value to a fifth upper limit value and the lower limit value to a fifth lower limit value when the depression gradient of the accelerator pedal is less than a second position variation threshold corresponding to a rapid release of the accelerator pedal, the second position variation threshold being less than the first position variation threshold, and the depression of the accelerator pedal is greater than the third predetermined position threshold and less than the second predetermined position threshold, the fifth upper limit value being calculated from a fourth positive speed variation map and the fifth lower limit value being calculated from a fourth negative speed variation map, and wherein the means for generating sets the upper limit value to a sixth upper limit value and the lower limit value to a sixth lower limit value when the depression gradient of the accelerator pedal is greater than the second position variation threshold and less than the first position variation threshold, and the depression of the accelerator pedal is greater than the third predetermined position threshold and less than the second predetermined position threshold, the sixth upper limit value being calculated from a fifth positive speed variation map and the sixth lower limit value being calculated from a fifth negative speed variation map.