Patent ID: 6668217
Filing Date: 2003-12-23
Classification: B60L,B60W,B61L,Y02T,Y10T

Abstract:
A method for power optimization in a vehicle traveling over a route, the vehicle having a drive system and a travel resistance, the route having a route resistance, the method comprising:planning a schedule for the vehicle to travel over the route, the schedule including a time reserve; and determining a power-saving travel mode for the vehicle using an optimization algorithm which takes account of the time reserve and a vehicle model, wherein kinetic energy of the vehicle and time are used as state variables in the vehicle model, and changes in the state variables with respect to distance travelled over the route are determined based on the following differential equations: &dd;ekin&dd;s=A-B&it;ekin-C&CenterDot;ekin,and&it;â€ƒ&it;&dd;t&dd;s=D&it;1ekin,with D=22,where ekin=1m&CenterDot;Ï &it;Ekin=12&it;v2,and where:Ekin is kinetic energy of the vehicle, ekin is specific kinetic energy of the vehicle normalised to the vehicle mass, A is tractive force (acceleration and braking) applied by a drive system of the vehicle, route resistance and constant components of the travel resistance, B is a speed-dependent part of the travel resistance (running-gear coefficient for interfering movements), C is a speed-dependent part of the travel resistance (air resistance), m is mass of the vehicle, s is distance traveled over the route, t is time elapsed, v is speed of the vehicle, and &rgr; is an additional factor for rotating masses.