METHOD FOR DETERMINING THE GRADIENT OF A ROAD

• Main Authors: ZAOUI KAMAL, BORSOTTO BASTIEN, PLANCON SEBASTIEN
• Format: Patent
• Language: English; Korean
• Published: 07.09.2012
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL

The invention relates to a method for determining the gradient of a road on which a vehicle is travelling, which comprises, at an instant t: a) measuring the speed of rotation of the wheels of the vehicle and deducing therefrom the driving acceleration Am(t) of the vehicle at said instant t; b) measuring the total acceleration At(t) of the vehicle at said instant t; c) calculating the resulting acceleration Ar(t) of the vehicle at the instant t, which is equal to subtracting the driving acceleration Am(t) from the total acceleration At(t) of the vehicle at said instant t; h) determining the gradient of the road I(t), Ip(t) at the instant t according to said calculated resulting acceleration Ar(t), characterised in that, after step d), the following steps are also performed: d) calculating at said instant t, the instant slope P(t) at the instant t of the signal showing the resulting acceleration Ar(T) according to the time T; e) comparing said calculated instant slope P(t) with a predetermined threshold value PMAX; and, f) if the calculated instant slope P(t) is greater than said threshold value PMAX, correcting the resulting acceleration Ar(t) calculated at the instant t in order to force said instant slope P(t) to be equal at said instant t to said predetermined threshold value PMAX; g) using said corrected resulting acceleration Ar(t) to determine the gradient of the road I(t), Ip(t) at the instant t in step h).