Patent ID: 8645033

Claim:
An engine driven vehicle comprising: at least one engine: and control devices that are arranged to control a transmission that is driven by the engine, which control devices are arranged to receive at least two sets of data, each set comprising at least one of a first signal that comprises information about a gradient of a surface on which the vehicle is being driven it from a first sensor, and at least one second signal that comprises information about a speed of the vehicle sent from a second sensor, and at least one third signal that comprises information about acceleration of the vehicle, wherein the control devices arc also arranged to calculate at least one of two different resistance to travel, constants k 1 and k 2 , where k 1 is a rolling resistance constant and k 2 is an air resistance constant, in response to the first, second and third signals, and to control the transmission in response to at least one of the constants k 1 and k 2 , and where at least one of k 1 and k 2 is calculated by solving a system of equations, which system of equations comprises the two sets of data, and where the information in each of the two sets of data represents values for when a propulsive force of the vehicle is zero.