Method for detecting a motor vehicle overweight state, and method for managing the charge of a traction battery
A method detects a vehicle overweight state for a vehicle equipped with a power unit including a traction battery. The method selects a number of vehicle acceleration phases. The method includes, for each selected acceleration phase: calculating a mean value of a differential force equal to a value of the traction loads of the unit from which there are subtracted the value of the acceleration resultant force and the value of the sum of the resistive loads experienced by the vehicle, calculating a statistical value based on the calculated mean values of the differential force, and comparing the statistical value against a vehicle overweight threshold value. The vehicle is in an overweight state if the statistical value is higher than the threshold value.
1 . A method for detecting a state of excessive weight of a motor vehicle equipped with a power train comprising a traction battery, the method comprising:
selecting a determined number of phases of longitudinal acceleration of the vehicle, for each of which the longitudinal acceleration is greater than a longitudinal acceleration threshold value; and
for each selected longitudinal acceleration phase:
calculating an average value of a differential force which is equal to a value of traction efforts of the power train from which are subtracted a value of a resultant longitudinal acceleration force of the vehicle and a value of a sum of resisting efforts to which the vehicle is subjected while rolling,
calculating a statistical value from the calculated average values of the differential force, and
comparing the calculated statistical value with a threshold value of excessive weight of the vehicle,
wherein the vehicle is in a state of excessive weight when the statistical value is greater than the threshold value of excessive weight of the vehicle.
2 . The detection method as claimed in claim 1 , wherein the statistical value is an average of all the calculated average values of the differential force.
3 . The detection method as claimed in claim 1 , wherein the threshold value of longitudinal acceleration is greater than or equal to 0.5 m/s 2 .
4 . The detection method as claimed in claim 1 , wherein the selecting the longitudinal acceleration phases is disabled when a speed of the vehicle is greater than a speed threshold value.
5 . The detection method as claimed in claim 1 , wherein the number of longitudinal acceleration phases selected is a value associated with the motor vehicle.
6 . The detection method as claimed in claim 1 , wherein the resultant longitudinal acceleration force is defined by a product of a value of a constant value of a reference weight of the vehicle by the value of the longitudinal acceleration of the vehicle.
7 . The detection method as claimed in claim 1 , wherein the resisting efforts are defined by a sum of aerodynamic drag forces of the vehicle, of rolling resistance forces of the vehicle, and of forces linked to a gradient of a terrain.
8 . A method for managing a charge of a traction battery of a motor vehicle, comprising:
detecting a possible state of excessive weight of the vehicle; and
increasing, when the state of excessive weight is detected, an energy level stored in the traction battery to a charge threshold to respond to temporary vehicle rolling situations,
wherein the detecting includes
selecting a determined number of phases of longitudinal acceleration of the vehicle, for each of which the longitudinal acceleration is greater than a longitudinal acceleration threshold value; and
for each selected longitudinal acceleration phase:
calculating an average value of a differential force which is equal to a value of traction efforts of a power train from which are subtracted a value of a resultant longitudinal acceleration force of the vehicle and a value of a sum of resisting efforts to which the vehicle is subjected while rolling,
calculating a statistical value from the calculated average values of the differential force, and
comparing the calculated statistical value with a threshold value of excessive weight of the vehicle,
wherein the vehicle is in a state of excessive weight when the statistical value is greater than the threshold value of excessive weight of the vehicle.
9 . A power train comprising:
a heat engine and an electric motor associated with a traction battery, wherein the charge of the traction battery is controlled by the management method as claimed in claim 8 .